Moulding of hollow moulded fibre product

Abstract

Moulding system 100 for moulding a hollow moulded fibre product from a fibre suspension, the moulding system comprising: a permeable mould part 110 defining a space within which the hollow moulded fib

Description

TECHNICAL FIELD The present invention relates to methods and systems for moulding a hollow moulded fibre product from a fibre suspension, such as a fibre suspension comprising paper pulp. The hollow moulded fibre product may be further processed to form a receptacle which may be consumer packaging, such as a bottle, jar or a certain type of vase, useful for holding a liquid, powder, other flowable material, one or more solid objects, or a combination thereof. BACKGROUND It is desirable to reduce glass and plastics use in consumable items, particularly packaging. Non-necked receptacles, such as trays, bowls and other simple shapes, are commonly made from paper pulp. However, a more complex necked receptacle, like a bottle, jar or certain types of vase, is more difficult to engineer due to an internal narrowing of the receptacle between a main body portion of the receptacle and an opening of the receptacle. At certain stages, particularly early stages, during formation of a hollow moulded fibre product, the hollow moulded fibre product may be unevenly formed. A receptacle produced from the hollow moulded fibre product may then comprise structural weaknesses or be poorly finished. SUMMARY According to a first aspect, there is provided a moulding system for moulding a hollow moulded fibre product from a fibre suspension. The moulding system comprises a permeable mould part defining a space within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure in which liquid is removed from the space. The permeable mould part defines an axis and comprises zones of different permeability which are offset axially and / or circumferentially relative to the axis along the permeable mould part, and wherein the zones of different permeability are configured to provide different rates of liquid removal from the space during the moulding procedure. By varying the permeability of the primary mould axially or circumferentially, the rate of de-watering at different parts of the mould can be varied. This allows the thickness of retained fibres to be controlled, in order to compensate for variations in thickness that would otherwise occur with a constant permeability, such as due to the way in which the fibre suspension enters or settles in the space during moulding. For example, with a constant permeability, formed bottle-shaped hollow moulded fibre products have been found to have reduced retained fibre thickness at their necks, resulting in subsequent uneven further processing (such as thermoforming) and external fluffmess. By reducing permeability in other areas compared with the region of the mould part corresponding to the neck, the thickness of retained fibres in bottle-shaped precursors is reduced to more evenly match that of the neck. In some examples, the hollow moulded fibre product may be a precursor for a subsequent processing step, such as a bottle precursor used to form a bottle. In some examples, the fibre suspension comprises pulp fibres suspended in water (or an aqueous liquid). In some examples, the zones of different permeability are offset axially along the axis of the permeable mould part. In some examples, the zones of different permeability may be offset circumferentially along a surface of the permeable mould part. In some examples, the hollow moulded fibre product may have a circular cross section. In some examples, the hollow moulded fibre product may have a non-circular cross-section such as an elongate, square or squircle shape. The zones of different permeability may be offset circumferentially or peripherally along the surface of these non-circular cross-sections. Optionally, the permeable mould part comprises an enclosure for at least partially enclosing a mould, the mould comprising one or more internal surfaces that define a cavity within which the hollow moulded fibre product is moulded in use. Varying permeability of the mould may be implemented within the mould itself or using an enclosure for the mould. The use of an enclosure allows the mould itself to have constant permeability across its full surface, which improves the uniformity of the surface texture of the precursor, for example due to uniform distribution of pores. The use of an enclosure also allows for more fine control and adjustability of the permeability, because additional elements such as baffles and / or closable ports in the enclosure may be employed, whereas adjusting the properties of the mould itself may require a new mould to be fabricated. Optionally, the enclosure comprises ports which are configurable to provide the zones of different permeability with different rates of liquid removal from within the enclosure. Configurable ports or holes in the enclosure allow the arrangement of zones of different permeability to be optimised for different conditions (e.g., different fibre suspension inflow rates and / or different negative pressures) and / or different hollow moulded fibre products (e.g., different sizes and shapes of bottles). In some examples, the ports are manually pluggable holes. In some examples, the ports are automatically controllable to adjust over a range between fully open and fully closed. Optionally, the moulding system comprises the mould. Optionally, the moulding system comprises a plurality of baffles positioned between the enclosure and a mould at least partially enclosed by the enclosure, the plurality of baffles configured to define inter-baffle volumes between respective pairs of the baffles, at least two of which inter-baffle volumes correspond to the respective zones of different permeability. When a substantially uniform negative pressure is applied to the exterior of the enclosure, the variation in permeability of the enclosure causes a corresponding variation in negative pressure within the enclosure. The baffles allow this variation in negative pressure within the enclosure to be more precisely maintained at an external surface of the mould, so that the thickness of retained fibres is better controlled. In the absence of baffles, the different negative pressures introduced on the interior of the enclosure by its variation in permeability may become blended or less well defined by the time this effect reaches the exterior of the mould. In some examples, the baffles may extend fully from an interior of the enclosure to an exterior of the mould at least partially enclosed by the enclosure. In some other examples a gap may be left between an end of the baffles and the exterior of the mould in order to allow some limited blending between the inter-baffle volumes. This limited blending allows a more graduated change between the impact on deposition of the zones of different permeability which may also limit large step change differences in deposition between these zones on the internal surface(s) of the mould. Optionally, each of the plurality of baffles is configured to extend from the enclosure to an exterior of the mould at least partially enclosed by the enclosure. By extending the baffles from the enclosure to an external surface of a mould, the difference in negative pressure applied to different parts of the mould is more precisely controlled. This may be helpful in targeting specific areas of the mould that need more or less fibre deposition. In some examples, the baffles may directly contact the external surface of the mould. In some examples, the baffles may terminate with a seal that engages with the external surface of the mould. Optionally, one or more of the plurality of baffles comprises an opening connecting two of the inter-baffle volumes located on either side of the respective opening. The use of an opening in some baffles allows limited mixing of different negative pressures within adjacent inter-baffle volumes. This results in a more gradual change in thickness of retained fibres between zones rather than abrupt changes. This allows for some blending of deposition on the interior mould surface between zones which may further improve thermoforming performance and / or reduce fluflfmess of the final product. In some examples, the or each opening may comprise a plurality of perforations in the respective baffle. In some examples, the or each opening may comprise a small gap between the end of the respective baffle and the external surface of the mould. Optionally, the permeable mould part comprises a mould comprising one or more internal surfaces that define a cavity, within which cavity the hollow moulded fibre product is moulded in use, wherein the internal surfaces of the mould define the shape of the hollow moulded fibre product. As an alternative to, or in addition to, using zones of different permeability in an enclosure, the mould itself may include zones of different permeability. This enables a less complex moulding system and may allow for more precise control of fibre deposition associated with the different zones of permeability. Optionally, the moulding system comprises a control system configured to cause introduction of the fibre suspension into the space within which the hollow moulded fibre product is mouldable and to apply a negative pressure to the exterior of the mould part. Applying a negative pressure increases the rate at which liquid is removed from the space and may also allow for the different fibre retention effects of the zones of different permeability to be better controlled. Optionally, the moulding system is configured to mould an elongate hollow moulded fibre product, wherein the permeable mould part has a first zone of permeability for an upper portion of the permeable mould part, and a second zone of permeability for a lower portion of the permeable mould part; wherein the first zone of permeability has a higher permeability than the second zone of permeability. More fibres tend to be retained at the lower end of a precursor, opposite the end at which a fibre slurry is introduced. The neck of a bottle precursor is particularly susceptible to thinner retained fibre thickness. A higher permeability at this zone increases the rate of liquid removal compared with lower zones about a base, thereby increasing fibre retention in the neck area so that the thickness of retained fibres is greater and therefore may be more similar to that of the base. Optionally, the permeable mould part has a third zone of permeability for a bottom portion of the permeable mould part; wherein the third zone of permeability has a higher permeability than the second zone of permeability. In some examples, improved uniformity of retained fibre thickness can be achieved by providing the mould part with a bottom portion having a higher permeability than the lower portion. In some examples, the permeability of the third zone is lower than that of the first zone. In some examples, the permeability of the second zone is zero. According to a second aspect, there is provided a mould for use in a moulding system for moulding a hollow moulded fibre product from a fibre suspension. The mould comprises one or more internal surfaces that define a cavity, within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure in which liquid is removed from the cavity. The mould defines an axis and comprises zones of different permeability which are offset axially and / or circumferentially relative to the axis along the mould, and wherein the zones of different permeability are configured to provide different rates of liquid removal from the cavity during the moulding procedure. According to a third aspect, there is provided a method of using a mould for moulding a hollow moulded fibre product from a fibre suspension. The method comprises receiving the fibre suspension into a cavity of the mould, the cavity defined by one or more internal surfaces of the mould and within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure, the mould defining an axis; and removing liquid from the cavity through a plurality of zones of different permeability of the mould, the plurality of zones of different permeability being offset axially and / or circumferentially relative to the axis along the mould; wherein the zones of different permeability are configured to provide different rates of liquid removal from the cavity during the moulding procedure. According to a fourth aspect, there is provided a method of moulding a hollow moulded fibre product from a fibre suspension. The method comprises receiving the fibre suspension into a permeable mould part defining a space within which the hollow moulded fibre product is mouldable from the fibre suspension, the permeable mould part defining an axis, and removing liquid from the space through a plurality of zones of different permeability of the permeable mould part, the plurality of zones of different permeability being offset axially and / or circumferentially relative to the axis along the permeable mould part; wherein the zones of different permeability are configured to provide different rates of liquid removal from the space. Optionally, the permeable mould part comprises an enclosure for at least partially enclosing a mould comprising one or more internal surfaces that define a cavity and within which the hollow moulded fibre product is moulded in use, the enclosure comprising ports for removing liquid from the space. The method comprises configuring the ports to provide the zones of different permeability with respective different rates of liquid removal. Configurable ports or holes in the enclosure allow the arrangement of zones of different permeability to be optimised for different conditions (e.g., different fibre suspension inflow rates and / or different negative pressures) and / or different hollow moulded fibre products (e.g., different sizes and shapes of bottles). In some examples, the ports are manually pluggable holes. In some examples, the ports are automatically controllable to adjust over a range between fully open and fully closed. Optionally, the method comprises configuring the ports to reduce permeability of the enclosure during a fibre suspension introduction period during which the fibre suspension is introduced into the cavity of the mould, and configuring the ports to provide the zones of different permeability during a liquid removal period during which liquid is removed from the space. Closing the ports of the enclosure to reduce permeability during filling of the mould allows liquid removed from the mould to accumulate between an interior of the enclosure and an exterior of the mould, reducing the likelihood of fibres sticking in the pores; this in turn reduces fluffmess in the finished bottle. Optionally, the hollow moulded fibre product comprises an elongate shape and the method comprises providing a first zone of permeability for an upper portion of the permeable mould part, and providing a second zone of permeability for a lower portion of the permeable mould part; wherein the first zone of permeability has a higher permeability than the second zone of permeability. Optionally, the method further comprises providing a third zone of permeability for a bottom portion of the permeable mould part; wherein the third zone of permeability has a higher permeability than the second zone of permeability. According to a fifth aspect, there is a provided a control system configured to cause a moulding system to perform any one of the above methods. According to a sixth aspect, there is provided a non-transitory storage medium storing machine-readable instructions that, when executed by a processor of a control system, cause the processor to control a moulding system to perform any one of the above methods. In some examples of any of the above aspects, the hollow moulded fibre product is a necked hollow moulded fibre product, such as a precursor for a receptacle such as a bottle, a jar or a type of vase. In some examples of any of the above aspects, the hollow moulded fibre product is a bottle. According to a seventh aspect, there is provided a receptacle manufacturing line comprising any one of the above moulding systems for moulding the hollow moulded fibre product and apparatus for performing at least one additional process on the hollow moulded fibre product to provide the receptacle. The apparatus may comprise an interior coater and the at least one additional process may comprise the interior coater coating at least a portion of an interior of the product to produce an internally coated product. The apparatus may comprise a closurepart applicator and the at least one additional process may comprise the closure-part applicator applying a closure part to the product or the internally coated product to produce a closable or closed product. The apparatus may comprise an exterior coater and the at least one additional process may comprise the exterior coater coating at least a portion of an exterior of the product or the internally coated product or the closable or closed product to produce an externally coated product. The apparatus may comprise a decorator and the at least one additional process may comprise the decorator decorating the product or the internally coated product or the closable or closed product or the externally coated product to produce a decorated product. The apparatus may comprise a dryer and the at least one additional process may comprise the dryer drying the product or the internally coated product or the closable or closed product or the externally coated product or the decorated product to produce a dried product. The apparatus may comprise an evaluator and the at least one additional process may comprise the evaluator evaluating the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, or the dried product to produce an evaluated product. In some examples, the receptacle is the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, the dried product, or the evaluated product. In some examples, the receptacle is a necked receptacle, such as a bottle, jar or a type of vase, and the receptacle manufacturing line is a necked-receptacle manufacturing line. In some examples, the receptacle is a bottle. According to an eighth aspect, there is provided a method of manufacturing a receptacle, the method comprising performing any one of the above methods to mould the hollow moulded fibre product, and then performing at least one additional process on the hollow moulded fibre product to provide the receptacle. The at least one additional process may comprise coating at least a portion of an interior of the product to produce an internally coated product. The at least one additional process may comprise applying a closure part to the product or the internally coated product to produce a closable or closed product. The at least one additional process may comprise coating at least a portion of an exterior of the product or the internally coated product or the closable or closed product to produce an externally coated product. The at least one additional process may comprise decorating the product or the internally coated product or the closable or closed product or the externally coated product to produce a decorated product. The at least one additional process may comprise drying the product or the internally coated product or the closable or closed product or the externally coated product or the decorated product to produce a dried product. The at least one additional process may comprise evaluating the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, or the dried product to produce an evaluated product. In some examples, the receptacle is the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, the dried product, or the evaluated product. In some examples, the receptacle is a necked receptacle, such as a bottle, jar or a type of vase. In some examples, the receptacle is a bottle. According to a ninth aspect, there is provided a method of providing a contentcontaining receptacle, the method comprising providing a receptacle obtained by the method of the eighth aspect and providing the contents in the receptacle to provide the content-containing receptacle. In some examples, the providing the contents in the receptacle comprises putting the contents into the receptacle. In contrast, in some examples, the providing the receptacle comprises providing the receptacle with the contents already present in the receptacle, thereby providing the contents in the receptacle. The contents may be in the form of, for example, a liquid, a powder, other flowable materials, one or more solid objects, or a combination thereof. For example, the contents may be a foodstuff such as a condiment, a beverage such as an alcoholic beverage, a household care product such as a detergent or other cleaning product, a personal care product such as a hair care product or a personal cleansing product or a healthcare product or a pharmaceutical product or a cosmetics product, a fragrance product such as a perfume, a vehicle product such as motor oil, or an industrial product. Other suitable contents will be apparent to the skilled reader in view of the content of this application and their common general knowledge. In some examples, the receptacle is a necked receptacle, such as a bottle, ajar or a type of vase. In some examples, the receptacle is a bottle. Optionally, the method comprising closing an opening of the receptacle after the providing contents in the receptacle, and / or applying a label or indicia to the receptacle. In some examples, the closing comprises applying a closure (such as a lid or a cap or a heat seal) to the receptacle to close the opening. In some examples, the closing comprises applying a heat seal to the receptacle and (e.g., thereafter) applying a lid or a cap to the receptacle. In some examples, the applying the label or indicia to the receptacle occurs after the providing the contents in the receptacle (that is, the label or indicia is applied to the content-containing receptacle). In other examples, the applying the label or indicia to the receptacle occurs before or during the providing the contents in the receptacle. In some examples, the applying occurs before the closing. In some examples, the applying occurs after the closing. In some examples, the applying occurs during the closing. According to a tenth aspect, there is provided use of a receptacle obtained by the method of the eighth aspect to contain contents. The use could be, for example, by a person (such as a natural person or a company) who puts the contents into the receptacle, or by a person who transports the contents, or by a person who wishes to dispose of (e.g., to a consumer or end user), offer to dispose of (e.g., to a consumer or end user), import, or keep the contents whether for disposal or otherwise. The contents may, for example, be in the form of any of those discussed above. In some examples, the receptacle is a necked receptacle, such as a bottle, ajar or a type of vase. In some examples, the receptacle is a bottle. In an eleventh aspect, there is provided a moulding system for moulding a hollow moulded fibre product, the system comprising: a mould which comprises one or more internal surfaces that define a cavity within which the hollow moulded fibre product is mouldable, the mould having a passageway that provides fluid communication between the cavity and an exterior of the mould, and wherein the mould is configured to receive a flow of fibre suspension in use; an enclosure configured to at least partially enclose the mould and provide a spacing volume between the enclosure and the at least partially enclosed mould to allow liquid removed from the cavity through the passageway to accumulate into a body of liquid within the spacing volume and adjacent at least part of the exterior of the mould. Enclosing or partly enclosing a mould within an enclosure when adding a fibre slurry for moulding allows liquid removed from the mould to accumulate around an exterior of the mould. This removed liquid rises around the exterior of the mould as a cavity of the mould fills with fibre slurry, before optionally emptying out of an outflow such as a larger overflow opening near the top of the mould and / or through smaller holes lower down the enclosure wall. Having a body of fluid around the exterior of the mould when the mould fills with fibre slurry has the effect of retaining liquid in and around the pores whilst fibres continue to be introduced into the cavity during filling. The presence of this retained liquid reduces the likelihood of fibres sticking in pores of the mould and improves the evenness of fibre deposition in the bottle precursor. This in turn reduces fluffmess of an external surface of the moulded hollow moulded fibre product and reduces or eliminates mould cleaning to remove stuck fibres. In addition, the buffering effect of fluid inside and outside the mould improves the deposition of fibres around the neck of a bottle-shaped hollow moulded fibre product. In a twelfth aspect, there is provided a moulding system for moulding a hollow moulded fibre product, the system comprising: a fibre suspension supply system; an enclosure comprising a liquid removal mechanism, the enclosure configured in use to at least partially enclose a mould which comprises one or more internal surfaces that define a cavity within which the hollow moulded fibre product is to be moulded, the mould having a passageway that provides fluid communication between the cavity and an exterior of the mould, and wherein the enclosure is configured to provide a spacing volume between the enclosure and the at least partially enclosed mould in use; a control system, configured to control the fibre suspension supply system to introduce a flow of fibre suspension from the fibre suspension supply system into the cavity such that a liquid removed from the fibre suspension through the passageway of the mould into the spacing volume accumulates into a body of liquid external to the mould in the spacing volume. In an example, the enclosure comprises an opening to allow liquid from the body of liquid to be removed from the spacing volume, the opening being located above the cavity of the mould. This arrangement allows the liquid around the mould to rise up to an upper part of the hollow moulded fibre product such as a neck of a bottle precursor (or the upper most part of a precursor even if not vertically oriented) before overflowing. This improves fibre deposition of this upper part of the hollow moulded fibre product, as otherwise this may be reduced compared with deposition at lower parts, particularly when the fibre suspension is introduced from above. This may be particularly beneficial for areas such as the neck of a bottle precursor. In an example, the enclosure comprises one or more holes to allow liquid from the body of liquid to be removed from the spacing volume, the one or more holes being located below an uppermost height of the cavity of the mould. The use of holes in the enclosure may also allow for simpler control of the level of liquid in the spacing volume in order to better control deposition in the hollow moulded fibre product. The holes may also allow for removal of liquid in arrangements where the precursor is not vertically oriented, for example if a bottle precursor were to be horizontally oriented. In some examples, the holes may be located in a base of the enclosure. In some examples, the holes may be located along a side of the enclosure. In some examples, the holes along the side of the enclosure may comprise a variation in permeability along the side of the enclosure. In some examples, the enclosure is elongate and defines an axis, and the holes are located axially or circumferentially relative to the axis along the side of the enclosure. In an example, the moulding system comprises a negative-pressure source configured to apply a negative pressure to the spacing volume. In some examples, the negative pressure may be applied after introduction of fibre suspension into the cavity has stopped, in order to remove or to accelerate removal of liquid from the spacing volume. In some examples, the negative pressure may be applied during and after introduction of the fibre suspension into the cavity. In an example, the moulding system is controlled to introduce liquid into the spacing volume prior to, or during, the introduction of the fibre suspension into the cavity. Using liquid in the spacing volume additional to that provided from the fibre suspension may provide improved fibre deposition and / or reduce pore clogging. In an example, the moulding system comprises a bleed valve configured to open the cavity to atmosphere following the introduction of fibre suspension into the cavity. This allows improved control of the removal of liquid from the cavity and / or the spacing volume. In a thirteenth aspect, there is provided a method of moulding a hollow moulded fibre product, the method comprising: receiving a flow of fibre suspension into a cavity of a mould comprising one or more internal surfaces that define the cavity within which the hollow moulded fibre product is to be moulded, the mould having a passageway that provides fluid communication between the cavity and an exterior of the mould; and removing liquid from the cavity through the passageway into a spacing volume between the mould and an enclosure at least partially enclosing mould in order to accumulate a body of liquid within the spacing volume and adjacent at least part of the exterior of the mould. In an example, the method comprises removing liquid from the body of liquid in the spacing volume using an opening in the enclosure which is located above the cavity of the mould. This arrangement allows the liquid around the mould to rise up to the neck of a bottle precursor (or the upper most part of a precursor even if not vertically oriented) before overflowing, in order to improve fibre deposition of the neck. In an example, liquid from the body of liquid is removed from the spacing volume through one or more holes in the enclosure, the one or more holes being located below an uppermost height of the cavity of the mould. This may also allow for removal of liquid in arrangements where the precursor is not vertically oriented, for example if a bottle precursor were to be horizontally located. In some examples, the holes may be located in a base of the enclosure. In some examples, the holes may be located along a side of the enclosure. In some examples, the holes along the side of the enclosure may comprise a variation in permeability along the side of the enclosure. In an example, the method comprises applying a negative pressure to the spacing volume. In some examples, the negative pressure may be applied after introduction of fibre suspension into the cavity has stopped, in order to remove or to accelerate removal of liquid from the spacing volume. In some examples, the negative pressure may be applied during and after introduction of the fibre suspension into the cavity. In an example, the method comprises introducing liquid into the spacing volume prior to, or during, the introduction of fibre suspension into the cavity. Using liquid in the spacing volume additional to that provided from the fibre suspension may provide improve fibre deposition and / or reduce fibre pore clogging properties. In an example, the method comprising opening the cavity to atmosphere following the introduction of fibre suspension into the cavity. This allows improved control of the removal of liquid from the cavity and / or the spacing volume. According to a fourteenth aspect, there is a provided a control system configured to cause a moulding system to perform the method of the thirteenth aspect. In a fifteenth aspect there is provided a non-transitory storage medium storing machine-readable instructions that, when executed by a processor of a control system, cause the processor to control a moulding system to perform the method of the thirteenth aspect. In some examples of any of the eleventh to fifteenth aspects, the hollow moulded fibre product is a necked hollow moulded fibre product, such as a precursor for a receptacle such as a bottle, ajar or a type of vase. In some examples of any of the eleventh to fifteenth aspects, the hollow moulded fibre product is a bottle. In a sixteenth aspect, there is provided a receptacle manufacturing line comprising the moulding system of the eleventh aspect or twelfth aspect for moulding the hollow moulded fibre product and apparatus for performing at least one additional process on the hollow moulded fibre product to provide the receptacle. The apparatus may comprise an interior coater and the at least one additional process may comprise the interior coater coating at least a portion of an interior of the product to produce an internally coated product. The apparatus may comprise a closurepart applicator and the at least one additional process may comprise the closure-part applicator applying a closure part to the product or the internally coated product to produce a closable or closed product. The apparatus may comprise an exterior coater and the at least one additional process may comprise the exterior coater coating at least a portion of an exterior of the product or the internally coated product or the closable or closed product to produce an externally coated product. The apparatus may comprise a decorator and the at least one additional process may comprise the decorator decorating the product or the internally coated product or the closable or closed product or the externally coated product to produce a decorated product. The apparatus may comprise a dryer and the at least one additional process may comprise the dryer drying the product or the internally coated product or the closable or closed product or the externally coated product or the decorated product to produce a dried product. The apparatus may comprise an evaluator and the at least one additional process may comprise the evaluator evaluating the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, or the dried product to produce an evaluated product. In some examples, the receptacle is the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, the dried product, or the evaluated product. In some examples, the receptacle is a necked receptacle, such as a bottle, jar or a type of vase, and the receptacle manufacturing line is a necked-receptacle manufacturing line. In some examples, the receptacle is a bottle. In a seventeenth aspect, there is provided a method of manufacturing a receptacle, the method comprising performing the method of the thirteenth aspect to mould the hollow moulded fibre product, and then performing at least one additional process on the hollow moulded fibre product to provide the receptacle. The at least one additional process may comprise coating at least a portion of an interior of the product to produce an internally coated product. The at least one additional process may comprise applying a closure part to the product or the internally coated product to produce a closable or closed product. The at least one additional process may comprise coating at least a portion of an exterior of the product or the internally coated product or the closable or closed product to produce an externally coated product. The at least one additional process may comprise decorating the product or the internally coated product or the closable or closed product or the externally coated product to produce a decorated product. The at least one additional process may comprise drying the product or the internally coated product or the closable or closed product or the externally coated product or the decorated product to produce a dried product. The at least one additional process may comprise evaluating the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, or the dried product to produce an evaluated product. In some examples, the receptacle is the product, the internally coated product, the closable or closed product, the externally coated product, the decorated product, the dried product, or the evaluated product. In some examples, the receptacle is a necked receptacle, such as a bottle, jar or a type of vase. In some examples, the receptacle is a bottle. In an eighteenth aspect, there is provided a method of providing a contentcontaining receptacle, the method comprising providing a receptacle obtained by the method of the seventeenth aspect and providing the contents in the receptacle to provide the content-containing receptacle. In some examples, the providing the contents in the receptacle comprises putting the contents into the receptacle. In contrast, in some examples, the providing the receptacle comprises providing the receptacle with the contents already present in the receptacle, thereby providing the contents in the receptacle. The contents may be in the form of, for example, a liquid, a powder, other flowable materials, one or more solid objects, or a combination thereof. For example, the contents may be a foodstuff such as a condiment, a beverage such as an alcoholic beverage, a household care product such as a detergent or other cleaning product, a personal care product such as a hair care product or a personal cleansing product or a healthcare product or a pharmaceutical product or a cosmetics product, a fragrance product such as a perfume, a vehicle product such as motor oil, or an industrial product. Other suitable contents will be apparent to the skilled reader in view of the content of this application and their common general knowledge. In some examples, the receptacle is a necked receptacle, such as a bottle, a jar or a type of vase. In some examples, the receptacle is a bottle. In an example the method comprises closing an opening of the receptacle after the providing contents in the receptacle, and / or applying a label or indicia to the receptacle. In some examples, the closing comprises applying a closure (such as a lid or a cap or a heat seal) to the receptacle to close the opening. In some examples, the closing comprises applying a heat seal to the receptacle and (e.g., thereafter) applying a lid or a cap to the receptacle. In some examples, the applying the label or indicia to the receptacle occurs after the providing the contents in the receptacle (that is, the label or indicia is applied to the content-containing receptacle). In other examples, the applying the label or indicia to the receptacle occurs before or during the providing the contents in the receptacle. In some examples, the applying occurs before the closing. In some examples, the applying occurs after the closing. In some examples, the applying occurs during the closing. In a nineteenth aspect there is provided the use of a receptacle obtained by the method of the seventeenth aspect to contain contents. The use could be, for example, by a person (such as a natural person or a company) who puts the contents into the receptacle, or by a person who transports the contents, or by a person who wishes to dispose of (e.g., to a consumer or end user), offer to dispose of (e.g., to a consumer or end user), import, or keep the contents whether for disposal or otherwise. The contents may, for example, be in the form of any of those discussed above. In some examples, the receptacle is a necked receptacle, such as a bottle, ajar or a type of vase. In some examples, the receptacle is a bottle. In some examples of any of the above aspects, the fibre suspension comprises paper pulp and / or cellulose fibres. In some examples of any of the above aspects, the hollow moulded fibre product or the receptacle comprises cellulose fibres. It will be appreciated that optional features of aspects of the present invention may be equally applied to other aspects of the present invention, where appropriate. BRIEF DESCRIPTION OF DRAWINGS Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a schematic view of an example receptacle manufacturing line for performing a method of manufacturing receptacles from paper pulp; Figure 2 is a schematic view of an example moulding system for moulding a hollow moulded fibre product; Figure 3A illustrates an example mould having zones of different permeability which are offset axially relative to an axis along the mould; Figure 3B illustrates an example mould having zones of different permeability which are offset circumferentially relative to an axis along the mould; Figure 4A illustrates an example enclosure having zones of different permeability which are offset axially relative to an axis along the enclosure; Figure 4B illustrates an example enclosure having zones of different permeability which are offset circumferentially relative to an axis along the enclosure; Figure 5 illustrates another example enclosure having zones of different permeability which are offset axially relative to an axis along the enclosure; Figure 6 illustrates an example moulding system; Figure 7 illustrates another example moulding system; Figure 8 illustrates a method of moulding a hollow moulded fibre product, according to an example; Figure 9 illustrates a method of moulding a hollow moulded fibre product, according to another example; Figure 10 shows a non-transitory computer-readable storage medium according to an example; Figure 11 shows a schematic cross-sectional view of a receptacle containing contents, according to an example; and Figure 12 shows a method of providing a content-containing receptacle. DETAILED DESCRIPTION The following description presents exemplary embodiments and, together with the drawings, serves to explain principles of embodiments of the invention. Figure 1 shows a receptacle manufacturing line for performing a method of manufacturing receptacles, in this case necked receptacles, and more specifically in this case in the form of bottles, from paper pulp (i.e., which can form the basis of an example fibre suspension). By “necked receptacle” it is meant that the receptacle has an internal narrowing, or “neck”, between a main body portion, in which most of or all the contents of the receptacle are stored in use, and an opening through which the contents can enter or leave the receptacle in use. The internal width of the receptacle at the neck may be the same as or different to the internal width of the opening. However, the internal width of the neck is smaller than that of the main body portion, so that a shoulder is defined by and between the neck and the main body portion. This shoulder complicates manufacture of the receptacle, since it interferes with subsequent removal (and, in some cases, insertion) of whatever mould tool is inserted into the receptacle to form the internal shape of the receptacle. Examples of necked receptacles are bottles, jars, and certain types of vases. The process is merely exemplary and is provided to give context to examples of the present invention. It will be appreciated that, in other examples, the receptacle manufacturing line could be for making non-necked receptacles (i.e., receptacles without such a neck), such as bowls or trays. Broadly speaking, the exemplary process comprises providing a fibre suspension, introducing the fibre suspension into a mould cavity of a porous first mould and expelling a liquid (such as water) from the fibre suspension to produce a hollow moulded fibre product (which may be called a wet precursor or embryo) in the mould cavity, further moulding the hollow moulded fibre product to produce a hollow further-moulded fibre product, drying and then internally-coating the hollow further-moulded fibre product to produce an internally coated product, drying the internally coated product to produce a dried product, applying a closure part to the dried product to produce a closable or closed product, externally-coating and / or decorating the closable or closed product to produce an externally coated and / or decorated product, and then drying the externally coated or decorated product to produce another dried product. As will be apparent at least from the following description, modifications may be made to the exemplary process to provide variants thereof in which other examples of the present invention may be embodied. For example, in some cases, either the internal coating or the external coating and / or decorating may be omitted. Moreover, in the present case and as indicated by the stars labelled Ins. 1 to Ins. 5 in Figure 1, the process comprises inspecting or evaluating the hollow further-moulded fibre product, the internally coated product, the closable or closed product, the externally coated or decorated product, and the dried product to produce respective evaluated products. In some examples, the receptacle is the hollow moulded fibre product, the hollow further-moulded fibre product, the internally coated product, the closable or closed product, the externally coated or decorated product, one of the dried products, or one of the respective evaluated products. In this example, providing the fibre suspension comprises preparing the fibre suspension from ingredients thereof. More specifically, the preparing comprises providing pulp fibres, such as paper pulp fibres, and mixing the pulp fibres with a liquid to provide hydrated pulp fibres. In this example, the pulp fibres are provided in sheet form from a supplier and the liquid comprises water and one or more additives. In this example, the liquid is mixed with the pulp fibres to provide hydrated pulp fibres having a solid fibres content of lwt% to 5wt% (by dry mass of fibres). In examples, the one or more additives includes a sizing agent, such as alkylketene dimer (AKD). The hydrated pulp fibres typically comprise AKD in an amount of 0.4wt% with respect to the total dry mass of the solid fibres in the hydrated pulp fibres. In some examples, one or more additives are present in the liquid at the point of mixing the pulp fibres with the liquid. In some examples, one or more additives are included in the hydrated pulp fibres after mixing the pulp fibres with the liquid (for example, the pulp fibres are hydrated for a period of time, such as from 2 to 16 hours, and then one or more additives are supplied to the hydrated pulp fibres). The hydrated pulp fibres are passed between plates of a valley beater 11 or refiner that are in motion relative to each other. This fibrillates some, or all, of the fibres, meaning that cell walls of those fibres are caused to become partially delaminated so that wetted surfaces of those fibres comprise protruding hairs or fibrillations. These fibrillations will help to increase a strength of bonds between the fibres in the dried end product. In other examples, the valley beater 11 or refiner may be omitted. The resultant processed pulp is stored in a vat 12 in a relatively concentrated form (for example, a solid fibres content of lwt% to 5wt%) to reduce a required storage space. At an appropriate time, the processed pulp is transferred to a mixing station 13 at which the processed pulp is diluted in further water and, optionally, mixed with one or more additives (as well as, or in place of, the one or more additives provided with the hydrated pulp fibres) to provide the fibre suspension ready for moulding. In this example, the solid fibres account for 0.7wt% of the resultant fibre suspension (by dry weight of fibres), but in other examples the proportion of solid fibres in the fibre suspension may be different, such as another value in the range of 0.5wt% to 5wt%, or 0.1wt% to lwt%, of the fibre suspension (by dry weight of fibres). In some examples, the one or more additives mixed with the processed pulp and water includes a dewatering agent, such as modified and / or unmodified polyethylene imine (PEI), for example modified PEI sold under the trade name Polymin® SK. In some examples, the one or more additives are mixed with the water, and the water and one or more additives subsequently mixed with the processed pulp; in other examples, the processed pulp and water are mixed, and the one or more additives subsequently mixed with the processed pulp and water. The fibre suspension typically comprises Polymin® SK in an amount of 0.3wt% with respect to the total dry mass of the solid fibres. Mixing of the fibre suspension at the mixing station 13 helps to homogenise the fibre suspension. In other examples, the processed pulp or the fibre suspension may be provided in other ways, such as being supplied ready-made. Downstream of the vat 12 and the mixing station 13 is a first moulding station that comprises a porous first mould 15. In this example, the porous first mould 15 comprises two half-moulds 14 that are movable towards and away from each other, in this case using a hydraulic ram. In this example, each of the half-moulds 14 is a monolithic or unitary tool formed by additive manufacturing (for example, 3D-printing) that defines a mould profile, and, when the half-moulds 14 are brought into contact with each other, their respective mould profiles cooperate to define the mould cavity in which the hollow moulded fibre product is to be formed. Each half-mould 14 itself defines a smaller moulding cavity and, when brought into cooperation with a second half-mould 14, the smaller moulding cavities combine to provide the overall mould cavity. The two halfmoulds 14 may themselves be considered “splits” or “moulds” and the overall porous first mould 15 may be considered a “split-mould” or, again, a “mould”. In other examples, the porous first mould 15 may comprise more than two splits 14, such as three, four or six splits, that cooperate to define the moulding cavity. In Figure 1, the fibre suspension (also known as slurry) is top-filled into the porous first mould 15, in contrast to moulding processes that dip a mould in slurry. The fibre suspension is drawn under vacuum via a line 16 and into the porous first mould 15, with excess suspending liquid being drawn through the porous first mould 15 under vacuum via a line 18 into a tank 17. Shot mass may be controlled by measuring (for example, weighing) the amount of liquid drawn into the tank 17. A weight scale platform supporting the tank 17 is visible in Figure 1. Once a required amount (for example, a predetermined volume, such as 10 litres, or a predetermined mass, such as 10 kilograms) of liquid has been collected in the tank 17, suction of the suspending liquid through the porous first mould 15 is stopped and the first mould 15 is opened to ambient air. In this example, the suspending liquid drawn with the fibre suspension in line 16 is water, or predominantly water (as additives may also be present). The liquid drawn under vacuum via the line 18 and into the tank 17 is substantially free of fibres, since these are left behind against the walls of the porous first mould 15 to form the hollow moulded fibre product. In one example, in order to remove further suspending liquid (for example, water) from the hollow moulded fibre product, and form or consolidate the three-dimensional shape of the product, high pressure fluid (such as compressed air) is introduced into the first mould 15 to compress the fibre suspension against the cavity wall of the first mould 15. This process strengthens the product so that it can be handled, and displaces water from in between the fibres, thereby increasing the efficiency of a subsequent drying process. The fluid is regulated using a hydraulic pump 20. The pump 20 has a cylinder that displaces the fluid in a line 21 into the first mould 15. In an alternative example, an impermeable inflation element in the form of a collapsible bladder is inserted into the first mould 15 and expanded, by introduction of a fluid into the bladder from the line 21, to act as an internal high-pressure core structure for the first mould 15. In such an alternative, the fluid within the line 21 is preferably non-compressible, such as water or oil, although in other examples it could be a compressible fluid, such as air. Water has the advantage over other non-compressible liquids that any leaking or bursting of the bladder will not introduce a new substance to the system (since the suspending liquid is already water, or predominantly water). Demoulding occurs when the first mould 15 opens for removal of the self-supporting hollow moulded fibre product 22. Mould cleaning 23 is preferably performed subsequently, to remove any remaining small fibres and / or other debris and maintain a porosity of the porous first mould 15. In this example, a radially firing high-pressure jet is inserted into the mould cavity while the first mould 15 is open. This dislodges debris from the wall of the mould cavity. Alternatively, or in addition, water from the tank 17 is pressurised through the back of the porous first mould 15 to dislodge entrapped fibres and / or other debris. Water is drained for recycling back to an upstream part of the system. It is noteworthy that cleaning is important for conditioning the first mould 15 for re-use. The first mould 15 may appear visibly clean after removal of the receptacle, but its performance could be compromised without cleaning. According to Figure 1, the hollow moulded fibre product 22 is subsequently transported to a second moulding station where, in a, for example, aluminium, mould 25, pressure and heat are applied for thermoforming a desired neck and surface finish, optionally including embossed and / or debossed surface features. After two halves of the mould 25 have closed around the product 22, a pressuriser is engaged. For example, a bladder 26 (for example, a thermoforming bladder 26) is inserted into the product 22. The bladder 26 is inflated with a pressurised fluid supplied via a line 27 by a pump 28. The pressurised fluid is preferably a non-compressible fluid such as water or oil, although in other examples it could be a compressible fluid such as air. In other examples, during supply, the pressurised fluid is heated with, for example, a heater or, alternatively, is cooled with, for example, a heat exchanger. An external mould block 24 of the mould 25, and / or the mould 25 itself, is also, or alternatively, heated in some examples. After thermoforming, a state of the product 22, which may now be considered a hollow further-moulded fibre product, is considerably more rigid, with more compressed side walls, as compared with the state of the product 22 at demoulding from the first mould 15. A drying stage 30 (for example, a microwave drying process or other drying process) is performed on the product 22 downstream of the thermoforming, as shown, to provide a dried product. In one example, the drying stage 30 is performed before thermoforming to provide a dried product. However, moulding in the mould 25 requires some water content to assist with bonding during the compression process. The drying may be performed using a dryer, such as a machine that acts to cause drying of the product or simply a shelf or other support on which the product 22 rests while drying. The product 22 is then subjected to an internal-coating stage during which, in this example, an interior coater in the form of a spray lance 31 is inserted into the product 22 and applies one or more surface coatings to internal walls of the product 22 to produce an internally coated product. In another example, the product 22 is instead filled with and subsequently drained of a liquid that coats the internal walls of the product 22. In practice, such coatings provide a protective layer to prevent egress of contents into the bottle wall, which may permeate and / or weaken it. Coatings will be selected dependent on the intended contents of finished receptacle, for example, a beverage, foodstuff, detergent, lubricant, pharmaceutical product, etc. In this example, the internally coated product 22 is then subjected to a curing or drying process 32, which can be configured or optimised dependent on the internal coating, for example, drying for twenty-four hours at ambient conditions or by a flash drying method. The drying again may be performed using a dryer, such as a machine that acts to cause drying of the product or simply a shelf or other support on which the product 22 rests while drying. Following the drying, the coated product 22 is considered another dried product. A closure or mouth forming process is then performed on the product 22 by a closure-part applicator to produce a closable or closed product. For example, as shown in Figure 1, a neck fitment 33 is affixed to the dried product. This results in the product being closable subsequently by positioning of a cap, lid or other closure relative to the neck fitment. An exterior coating and / or decoration is then applied to the product 22 by an exterior coater and / or a decorator, respectively, as shown in the further stage 34, to produce an externally coated and / or decorated product. In one example, the product 22 is dipped into a liquid to coat its outer surface, as shown in Figure 1. In another example, the outer surface receives the external coating in a different manner. The coating and / or decoration may cover all or only part of an external surface of the product. The product 22 is then allowed to dry in warm air to produce another dried product. In other examples, the drying may be performed using a dryer such as one of those discussed above. The product 22 may therefore be fully formed, considered the end “receptacle”, and ready to accept contents therein. In other examples, the receptacle may be fully formed without the neck fitment 35 being affixed and / or without the interior coating being applied and / or without the exterior coating being applied and / or without the decoration being applied and / or immediately after one of the drying processes or one of the inspecting and / or evaluating processes. For example, in some cases, the product is provided with the closure part by moulding the closure part during moulding of the product at the first moulding station and / or the second moulding station. Reference is now directed to Figure 2, which is a schematic diagram of a moulding system 100 according to an example. The moulding system 100 shown is configured for moulding a hollow moulded fibre product 22 (shown in dashed outline) from a fibre suspension, during use of the system 100. The moulding system 100 corresponds to the first moulding station comprising a porous first mould 15 in Figure 1, and the hollow moulded fibre product 22 and / or the fibre suspension areas described above with reference to Figure 1. In this example, the hollow moulded fibre product 22 is, or will be (after further processing), a bottle. However, with suitable modifications to the system such as using a different mould, the hollow moulded fibre product 22 can be or can be used to make (with further processing) ajar, a vase, or another necked or non-necked receptacle for example. As shown in Figure 2, the system 100 comprises a mould 110 and an enclosure 120 at least partially enclosing the mould 110. In this example, the mould 110 corresponds to the mould 15 of Figure 1. In some examples, the system may omit the enclosure 120. The mould 110 and the enclosure 120 are permeable. As described in more detail below, one or both of these permeable mould parts 110, 120 define an axis and comprise zones of different permeability which are offset axially relative to the axis. In alternative examples, the zones of different permeability may be offset circumferentially and not axially, or be offset both axially and circumferentially. The permeable mould parts 110, 120 define a space within which a hollow moulded fibre product 22 is mouldable from fibre suspension according to a moulding procedure in which liquid is removed from the space. In this example, a space defined by the mould 110 comprises a cavity 112 within the mould and a space defined by the enclosure 120 comprises a volume 122 within the enclosure, between the mould 110 and the enclosure 120. The hollow moulded fibre product 22 is moulded within the cavity 112 of the mould 110, during use of the system 100. As also shown, the mould 110 comprises internal surfaces 114 that together define this cavity 112. The mould 110 further comprises a plurality of passageways or pores 111 as illustrated in detail M of a section of the mould 110. The passageways 111 provide fluid communication between one of the internal surfaces 114 of the mould 110 and an external surface 113 of the mould 110. This allows liquid within the cavity 112 to be removed to an exterior of the mould 110. For example, following introduction into the cavity 112 of a fibre suspension containing pulp fibres carried in a liquid medium such as water, the passageways 111 of the mould 110 allow the liquid medium to be removed from the cavity 112, leaving deposits of pulp fibre on the internal surfaces 114 of the mould 110. The mould 110 also comprises an inlet 116 opening into the cavity 112 in order to allow the introduction of the fibre suspension. In this example, the inlet 116 is provided in a neck portion 115 of the mould 110, which is facing a base portion 117 of the mould 110. The cavity 112 has an elongate shape with the inlet 116 located at one longitudinal end of the elongate shape. The mould 110 is configured for moulding a necked hollow moulded fibre product as a precursor for a bottle. However, other moulds with differently shaped cavities may alternatively be used for moulding different types of precursors. The mould 110 may also be associated with structural components 140 such as a frame to provide structural support and accurate positioning of the mould 110 and enclosure 120. In some examples, structural support may instead be provided by the enclosure 120, without the use of additional components. In this example, a major axis of the elongate shape of the mould 110 is vertically oriented; however, other orientations may alternatively be employed. In this example, a major axis of the elongate shape of the enclosure 120 is also vertically oriented; however, other orientations may alternatively be employed. The structural components 140 may contain the exterior of the mould 110 and enclosure 120 in order to collect liquid received from the cavity 112 via the passageways 111 and from within the enclosure 120. In this example, the mould 110 is formed from two separate half-moulds, or parts. Similarly, in this example the enclosure 120 is formed from two separate half-enclosures, or parts. However, this is by no means essential and in other examples the mould 110 and / or enclosure 120 could be formed of three, four, etc., parts. The enclosure 120 comprises a cylindrical wall 123 with a lower closed end 124 and an upper open end 125. However, other shapes may alternatively be implemented, such as an enclosure having a rectangular or elliptical cross-section. The mould 110 is fully enclosed within the enclosure 120, although in alternative arrangements the mould 110 may be partially enclosed with some of the mould 110 extending above the open end 125 of the enclosure 120. As with the mould 110, the enclosure 120 also comprises passageways or holes as illustrated in detail E of a section of the enclosure 120. The passageways 121 provide fluid communication between an internal surface of the enclosure 120 and an external surface of the enclosure 120. These passageways 121 may be similar to the pores 110 illustrated in detail M for the mould 110. However, in other examples, the passageways 121 may be of a different type, for example ports or holes in the enclosure 120 which are significantly larger than the passageways of pores in the screen 110 and that in some cases may be controllable. The passageways 121 of the enclosure 120 provide fluid communication between the space 122 between the mould 110 and an interior of the enclosure 120, to an exterior of the enclosure 120. This allows liquid within this space 122 to be removed to the exterior of the enclosure 120. For example, following introduction into the cavity 112 of a fibre suspension containing pulp fibres carried in a liquid medium such as water, the passageways 111 of the mould 110 allow the liquid medium to be removed from the cavity 112, leaving deposits of pulp fibre on the internal surfaces 114 of the mould 110. The liquid medium then accumulates in the volume 122 between the mould 110 and the enclosure 120, which may assist with improving the uniformity of the deposits of pulp fibre on the internal surfaces 114 of the mould 110. The retained liquid within the volume 122 may also help prevent fibres sticking in the pores 111 of the mould 110. The passageways 121 of the enclosure 120 then allow this retained liquid to be removed from the volume 122 to the exterior of the enclosure 120. In some examples, the rate at which liquid is removed from the volume 122 to the exterior of the enclosure 120 is slower than the rate at which liquid is removed from the cavity 112 of the mould 110 into the volume 122, allowing the liquid to accumulate up and around the exterior of the mould 110. Once the fibre suspension has stopped entering the cavity 112, the retained liquid in the volume 122 may then be allowed to drain fully from the enclosure 120. The moulding system 100 comprises a drain conduit 170 having a drain valve 172 and a negative pressure source 174, such as a vacuum pump. The drain conduit 170 is arranged to drain liquid from the exterior of the enclosure 120 (or mould 110, if an enclosure 120 is not used). The use of the vacuum pump 174 increases the rate of removal of liquid from the exterior of the enclosure / mould 120, 110. By controlling the vacuum pump, the rate of removal of liquid from the volume 122 and indirectly the cavity 112 can be improved or optimised. This may be used to help ensure that liquid is substantially removed from the cavity 112, in order to form the hollow moulded fibre product 22. In alternative examples, the negative pressure source 174 and / or drain valve 172 may be omitted, with the moulding system 100 relying on gravity to remove liquid from the mould 110 and / or enclosure 120. The moulding system 100 comprises a fibre suspension supply system 130 having a fibre suspension reservoir 132, a flow meter 136 and a fibre suspension valve 138. In use, the fibre suspension reservoir 132 may be provided with a fibre suspension 134, such as a pulp fibre slurry. The fibre suspension reservoir 132 comprises the vat 12 and mixing station 13 of Figure 1. The fibre suspension valve 138 controls the flow of fibre suspension 134 towards the mould 110. The flow meter 136 provides an indication of the rate of flow of fibre suspension 134 through the fibre suspension valve 138. The use of a device or method for measuring the flow rate of the fibre suspension 134 simplifies dosing or the amount of the fibre suspension 134 to be supplied to the mould 110. However, in alternative examples, different devices or methods for dosing of the fibre suspension 134 may be employed. In some examples, the fibre suspension supply system 130 may additionally comprise a pump (not shown) to apply positive pressure to fibre suspension 134 delivered to the mould 110. The moulding system 100 comprises a conduit network 160 arranged to deliver fibre suspension 134 from the fibre suspension system 130 into the cavity 112 of the mould 110. The conduit network 160 is coupled to the fibre suspension valve 138 and terminates in or about the inlet 116 of the mould 110. The conduit network 160 may comprise a plug or other fitting adapted to mate with the neck 115 of the mould 110, to avoid spillage of the fibre suspension 134. The conduit network 160 comprises a bleed valve 162 which couples the conduit network 160 to atmosphere. Opening the bleed valve 162 may facilitate the flow of the fibre suspension 134 into the cavity 112. In some examples, the bleed valve 162 may be located above the fibre suspension valve 138 to facilitate bleeding of air from this part of the conduit network 160. The moulding system 100 also comprises a control system 150 configured to control the fibre suspension supply system 130 and the drainage for the moulding system 100. The control system 150 is coupled to control the fibre suspension valve 138, the bleed valve 162, the drain valve 172 and the negative pressure source 174. The control system 150 is also coupled to receive data indicating a flow rate of the fibre suspension 134 from the flow meter 136. The control system 150 is configured to control the fibre suspension system 130 to introduce the fibre suspension 134 into the cavity 112. The control system 150 is also configured to control the drain valve 172 and negative pressure source 174 in order to facilitate removal of liquid from the cavity 112 of the mould 110 and from the volume 122 of the enclosure 120. By controlling the timing and / or levels of these components, the amount of liquid retained about the mould 110 in the volume 122 may be improved or optimised for improving uniformity of the retained pulp fibre forming the hollow moulded fibre product 22. Referring to Figure 3A, an example mould 210 is illustrated. This may be used in a moulding system such as the moulding system 100 of Figure 2, and may be used with or without an enclosure at least partially enclosing the mould, such as the enclosure 120 of Figure 2. A side view of the mould 210 is shown on the left and a cross-section on the right. The mould 210 comprises a cavity 212 within the mould 210, the hollow moulded fibre product 22 being moulded within the cavity 212, during use of the system 100. The mould 110 comprises internal surfaces that together define this cavity 212 and also comprises a plurality of passageways or pores. The passageways provide fluid communication between one of the internal surfaces of the mould 210 and an external surface of the mould 210. This allows liquid within the cavity 212 to be removed to an exterior of the mould 210. As can be seen, the mould 210 is substantially cylindrical and defines an axis 256, which in this example is a major axis and is vertically oriented. In other examples, other non-circular cross-section shapes may be employed. The mould 210 comprises zones of different permeability 213 A, 213B, 213C which are offset axially relative to the axis 256. The direction of offset is illustrated by arrow 257. The different permeability may be implemented by having a different density of pores 111 in the different zones and / or by using different sized pores 111 in the different zones. The effect of these different zones of permeability is to provide different rates of liquid removal from within the mould 210 (the cavity 212) to an exterior of the mould 110. In other words, the rate of de-watering at different parts of the mould 110 can be varied. This allows the thickness of retained fibres to be controlled, in order to compensate for variations in thickness that would otherwise occur with a constant permeability, such as due to the way in which the fibre suspension 134 enters or settles in the space during moulding. For example, when using moulds having a constant permeability, formed bottle-shaped hollow moulded fibre products have been found to have reduced retained fibre thickness at their necks, resulting in subsequent uneven further processing (such as thermoforming) and external fluffmess. By reducing permeability in other areas compared with the region of the mould portion corresponding to the neck, the thickness of retained fibres in bottle-shaped precursors is reduced to more evenly match that of the neck. Referring to Figure 3B, another example mould 230 is illustrated. This may be used in a moulding system such as the moulding system 100 of Figure 2, and may be used with or without an enclosure at least partially enclosing the mould, such as the enclosure 120 of Figure 2. A side view of the mould 230 is shown on the left and a cross-section on the right. As can be seen, the mould 230 is substantially cylindrical and defines an axis 266, which in this example is a major axis and is vertically oriented. In other examples, other non-circular cross-section shapes may be employed. The mould 230 comprises zones of different permeability 233D, 233E, 233F which are offset circumferentially relative to the axis 266. The direction of offset is illustrated by arrow 268. In other words, the permeability varies around the axis 266 of the mould 230. This is illustrated at 239 which shows variation in permeability across one face of the mould 230. The different permeability may be implemented by having a different density of pores 111 in the different zones and / or by using different sized pores 111 in the different zones. The mould 230 comprises a cavity 232 within the mould 230, the hollow moulded fibre product 22 being moulded within the cavity 232, during use of the system 100. The mould 110 comprises internal surfaces that together define this cavity 232 and also comprises a plurality of passageways or pores. The passageways provide fluid communication between one of the internal surfaces of the mould 230 and an external surface of the mould 230. This allows liquid within the cavity 232 to be removed to an exterior of the mould 230. As with the mould 210 of Figure 3 A, the effect of these different zones of permeability 233D, 233E, 233F is to provide different rates of liquid removal from with the mould 230 (the cavity 232) to an exterior of the mould 230. This allows the thickness of retained fibres to be better controlled. For example, additional fibre retention at the comers of the mould may be implemented by increasing the permeability of the mould 230 at these regions. In some examples, the mould may comprise zones of different permeability offset both axially and circumferentially relative to the axis. This may be advantageous for some hollow moulded fibre product shapes, such as bottles having a non-circular cross-section. Referring now to Figure 4A, an enclosure 320 is illustrated. This may be used in a moulding system such as the moulding system 100 of Figure 2, and is arranged to at least partially enclose a mould in use, such as the mould 110 of Figure 2. A side view of the enclosure 320 is shown on the left and a cross-section on the right. A mould 310 at least partially enclosed by the enclosure is illustrated in dashed outline. As can be seen the enclosure 320 is substantially cylindrical and defines an axis 356, which in this example is a major axis and is vertically oriented. In other examples, non-circular cross-section shapes may be employed. The enclosure comprises zones of different permeability 323 A, 323B, 323C which are offset axially relative to the axis 356. The direction of offset is illustrated by arrow 357. The different permeability may be implemented by having a different density of passageways 121 in the different zones and / or by using different sized passageways in the different zones. The effect of these different zones of permeability is to provide different rates of liquid removal from within the enclosure 320 to an exterior of the enclosure 320. In other words, the rate of de-watering at different parts of the enclosure 320 can be varied. When used with a mould, liquid removed from the mould will accumulate in the space between the mould and the enclosure 320. This in turn supports different rates of liquid removal from within the mould to an exterior of the mould. In other words, the rate of de-watering at different parts of the mould can be varied. This allows the thickness of retained fibres in the mould to be controlled, in order to compensate for variations in thickness that would otherwise occur with a constant permeability, such as due to the way in which the fibre suspension enters or settles in the space during moulding. For example, with a constant permeability, formed bottle-shaped hollow moulded fibre products have been found to have reduced retained fibre thickness at their necks, resulting in subsequent uneven further processing (such as thermoforming) and external fluffmess. By reducing permeability in other areas compared with the region of the mould portion corresponding to the neck, the thickness of retained fibres in bottle-shaped precursors is reduced to more evenly match that of the neck. The use of an enclosure 320 with zones of different permeability together with a mould having a constant permeability has a similar effect to a mould having zones of different permeability. Either mould part (enclosure or mould) may be implemented with the zones of different permeability, and in some cases both mould parts may have zones of different permeability. In other words, the use of varying permeability of the moulding system may be implemented within the mould itself and / or within the enclosure for the mould. The use of an enclosure allows the mould itself to have constant permeability across its full surface, which may improve the uniformity of the surface texture of the hollow moulded fibre product, for example due to uniform distribution of pores. The use of an enclosure also allows for more fine control and adjustability of the permeability, because additional elements such as baffles and closable ports in the enclosure may be employed, whereas adjusting the properties of the mould itself may require a new mould to be fabricated. On the other hand, the use of a mould having variable permeability simplifies the moulding system as only one mould part is needed. Referring to Figure 4B, another example enclosure 340 is illustrated. This may be used in a moulding system such as the moulding system 100 of Figure 2, and is arranged to at least partially enclose a mould in use, such as the mould 110 of Figure 2. A side view of the enclosure 340 is shown on the left and a cross-section on the right. A mould 330 at least partially enclosed by the enclosure is illustrated in dashed outline. As can be seen the enclosure 340 is substantially cylindrical and defines an axis 358, which in this example is a major axis and is vertically oriented. In other examples, non-circular cross-section shapes may be employed. The enclosure 340 comprises zones of different permeability 343D, 343E, 343F which are offset circumferentially relative to the axis 366. The direction of offset is illustrated by arrow 358. In other words, the permeability varies around the axis of the enclosure 340. This is illustrated at 349 which shows variation in permeability across one face of the enclosure 340. The different permeability may be implemented by having a different density of pores 121 in the different zones and / or by using different sized pores 121 in the different zones. As with the enclosure 320 of Figure 4A, the effect of these different zones of permeability 343D, 343E, 343F is to provide different rates of liquid removal from with the enclosure 340 and hence from the mould (cavity) to an exterior of the mould / enclosure 340. This allows the thickness of retained fibres within the mould to be better controlled. In some examples, the enclosure may comprise zones of different permeability offset both axially and circumferentially relative to the axis. This may be advantageous for some hollow moulded fibre product shapes, such as bottles having a non-circular cross-section. Referring now to Figure 5, an enclosure 420 is illustrated. This may be used in a moulding system such as the moulding system 100 of Figure 2, and is arranged to at least partially enclose a mould in use, such as the mould 110 of Figure 2. A side view of the enclosure 420 is shown in the upper region and a bottom view is shown in a lower region of the figure. The enclosure 420 is substantially cylindrical with a closed bottom and a partially closed and necked top. The enclosure 420 defines an axis 456, which in this example is a major axis and is vertically oriented. The enclosure 420 comprises zones of different permeability which are offset axially relative to the axis 456. The direction of offset is illustrated by arrow 457. In this example, the zones of different permeability are implemented using ports 423 or holes provided at different densities. These may be manually configurable, for example by plugging or unplugging these ports 423 to a desired density at different axial spacings as shown. In some embodiments, the ports 423 may be controllable by a control system to provide a desired permeability profile along the surface of the enclosure 420, depending on factors such as the shape of the mould and the desired thickness of the hollow moulded fibre product. In an example, the enclosure 420 or mould part has a first zone of permeability for an upper portion 461 (and / or 463) such as the neck (and / or shoulder). The enclosure 420 or mould part has a second zone of permeability for a lower portion 465 (and / or 467) such as the side. The first zone of permeability has a higher permeability than the second zone of permeability. This means that the first zone experiences greater de-watering which leads to a greater retention of fibres on the corresponding part of the mould. By contrast, the second zone experiences less de-watering which leads to a less retention of fibres on the corresponding part of the mould, compared with the part of the mould corresponding to the first zone. This arrangement may compensate for a natural tendency for less fibre to accumulate about the neck of a mould compared with the sides, thereby resulting in more even distribution of retained fibre in the hollow moulded fibre product. The enclosure 420 or mould part has a third zone of permeability for a bottom portion 469 such as the lower end of the enclosure. The third zone of permeability has a higher permeability than the second zone of permeability 465 or 467. A number of different zones of permeability may be provided in order to compensate for natural tendencies for the hollow moulded fibre product to have varying thickness of retained fibre. For example, additional thickness at the lower side may be compensated for by a zone of permeability 467 which has no or very low permeability to reduce fibre retention. On the other hand, lower thickness at the neck and shoulder of the hollow moulded fibre product may be compensated for by zones 461 and 463 having a high permeability to encourage fibre retention in these areas. Similarly, an intermediate permeability at zone 469 may encourage even thickness of retained fibres on the bottom of the hollow moulded fibre product. Referring now to Figure 6, a moulding system 500 having an enclosure 520 which at least partially encloses a mould 510 is illustrated. These mould parts 510, 520 may be used in a moulding system such as the moulding system 100 of Figure 2. The figure shows a vertical section through the moulding system. The enclosure 520 comprises zones of different permeability 523 A, 523B, 523C which are offset axially relative to a vertical axis of the enclosure 520. The enclosure 520 has a closed lower end, an open upper end and a side wall connecting the lower end to the upper end. An overflow outlet 545 is provided through the side wall of the enclosure 520 to provide drainage of liquid from a space 522 between the enclosure 520 and the mould 510. The mould 510 enclosed within the enclosure 520 comprises a neck section 515. In some examples, the upper end of the mould 510 extends out of the upper end of the enclosure 520. In some other examples, the mould 510 may be fully enclosed within the enclosure 520, as illustrated in dashed outline with additional enclosure section 530. The moulding system 500 comprises baffles 540 positioned between the enclosure 520 and the mould 510. The baffles 540 are configured to define inter-baffle volumes 545 between respective pairs of the baffles 540. The inter-baffle volumes 545 correspond to zones of different permeability. In other words, at least some of the baffles 540 are positioned to coincide with the boundaries between zones of different permeability. In the example, the baffles 540 extend fully from an interior of the enclosure 520 to an exterior of the mould 510. In some examples, the baffles 540 may contact the exterior surface of the mould 510 in use, or the baffles 540 may terminate in seals which engage the external surface of the mould 510. In yet other examples, the enclosure 520, baffles 540 and mould 510 may form a unified assembly. When a substantially uniform negative pressure is applied to the exterior of the enclosure 520, the variation in permeability along the exterior of the enclosure 520 causes a corresponding variation in negative pressure within the enclosure 520. The baffles 540 allow this variation in negative pressure within the enclosure 520 to be more precisely transmitted to and maintained at an external surface of the mould 510, so that the thickness of retained fibres is better controlled. In the absence of the baffles 540, the different negative pressures introduced in the interior of the enclosure 520 by its variation in permeability may become blended or less well defined by the time this effect reaches the exterior of the mould 510. In some other examples, a gap may be left between an end of the baffles 540 and the exterior of the mould 510 in order to allow some limited blending between the inter-baffle volumes 545. This limited blending allows a more graduated change between the impact on fibre deposition in the mould 510 of the zones of different permeability in the enclosure 520. This may also limit large step change differences in deposition between these zones on the internal surface(s) of the mould 510. Each of the baffles 540 comprises an opening 550 connecting two of the inter-baffle volumes 545 located on either side of the opening 550. These openings 550 also allow for some limited blending or mixing between the inter-baffle volumes 545, in order to provide a more graduated change between the impact on fibre deposition in the mould 510 of the zones of different permeability in the enclosure 520. The opening 550 in a baffle 540 may be singular or plural, for example implemented as an area of perforations. Referring now to Figure 7, a moulding system 600 having an enclosure 620 which at least partially encloses a mould 610 is illustrated. These mould parts 610, 620 may be used in a moulding system such as the moulding system 100 of Figure 2. The figure shows a vertical section through the moulding system 600. The enclosure 620 comprises side walls and a closed lower end and an open upper end. The enclosure 620 has a substantially uniform permeability across its surface, which in this example is zero but in other examples may be a low permeability. The system 600 includes a spacing volume 637 between the mould 610 and the enclosure 620, and an overflow outlet 645 is provided through one of the side walls to provide drainage of liquid from the spacing volume 637. During operation of the moulding system 600, a flow of fibre suspension 134 is received into a cavity of the mould 610 and liquid is removed from the accumulated fibre suspension 670 in the cavity through pores in the mould 610 into the spacing volume 637. The spacing volume 637 encloses the mould 610 in order to accumulate a body of liquid 675 within the spacing volume 637 and adjacent at least part of the exterior of the mould 610. The permeability of the enclosure 620 is less than that of the mould 610 such that liquid accumulates in the spacing volume 637 during filling of the mould 610 with the fibre suspension. This may be configured such that the liquid rises at approximately the same rate as the fibre suspension rises within the cavity of the mould 610. This removed liquid rises around the exterior of the mould 610 as the cavity of the mould 610 fills with the fibre suspension, before emptying out of the overflow outlet 645. In other examples, there may be smaller holes lower down the enclosure 620 and the removed liquid may empty out of those smaller holes. This arrangement allows the liquid around the mould to rise up to the neck of a bottle precursor (or the upper most part of a precursor even if not vertically oriented) before overflowing, in order to improve fibre deposition of the neck. Alternatively or additionally, a smaller hole lower down the enclosure may be used to eventually drain the liquid. Having a body of fluid around the exterior of the mould 610 when the mould 610 fills with fibre suspension has the effect of retaining liquid in and around the pores of the mould 610 whilst fibres continue to be introduced into the cavity during filling. The presence of this retained liquid reduces the likelihood of fibres sticking in the pores of the mould 610 and improves the evenness of fibre deposition of the bottle precursor. This in turn reduces fluffmess of an external surface of the moulded hollow fibre product and reduces or eliminates mould cleaning to remove stuck fibres. The lack of stuck fibres in the pores may also reduce mould cleaning requirements. In addition, the buffering effect of fluid inside and outside the mould 610 may improve the deposition of fibres around the neck of a bottle-shaped hollow moulded fibre product. In an alternative example, liquid from the body of liquid is removed from the spacing volume 637 through plural holes in the enclosure, the holes being located below an uppermost height of the cavity of the mould. Negative pressure may be applied to the spacing volume 637. In some examples, this may be applied after introduction of fibre suspension into the cavity has stopped, in order to remove or to accelerate removal of liquid from the spacing volume 637. In some examples, the negative pressure may be applied during and after introduction of the fibre suspension into the cavity. In an example, liquid may be introduced into the spacing volume 637 prior to, or during, the introduction of fibre suspension into the cavity. Using liquid in the spacing volume 637 additional to that provided from the fibre suspension may provide improved fibre deposition and / or reduce fibre pore clogging properties. Protrusions, not shown, may extend from the interior of the enclosure 620 to engage with the exterior of the mould 610 in order to position and support the mould 610 within the enclosure 620. In some examples, the mould 610 and enclosure 620 may be provided as separate components, whilst in other examples the mould 610 and enclosure 620 may be formed as a single component, or as combined halves with each half having both half the mould 610 and half the enclosure 620. Figure 8 illustrates a method 700 of moulding a hollow moulded fibre product according to an example. The hollow moulded fibre product may be the bottle precursor 22 provided by the moulding system 100 described above with reference to Figure 2. However, the method 700 may be used to mould other types of hollow moulded fibre products and / or to control different moulding systems. The method 200 may be implemented using the moulding system 100 of Figure 2, and / or in conjunction with the mould 15 of Figure 1, in conjunction with the moulds 210, 230 of Figures 3A and 3B, and / or the enclosures 320, 340, 420 or 520 of Figures 4 A, 4B, 5 or 6. The method 700 comprises, at block 710, receiving fibre suspension into a permeable mould part defining a space within which a hollow moulded fibre product is mouldable from the fibre suspension, the permeable mould part defining an axis. The permeable mould part may be a mould such as those previously described and / or the mould part may be an enclosure at least partially enclosing a mould in use. In some examples, the permeable mould part is elongate and the axis is an axial or longitudinal axis. The method 700 comprises, at block 720, removing liquid from the space through a plurality of zones of different permeability of the permeable mould part, the plurality of zones of different permeability being offset axially or circumferentially relative to the axis. The effect of this is to remove liquid at different rates at the different zones which contributes to different amounts of fibre retention at different internal surface areas of the mould. For example, one internal surface area of the mould may correspond with a zone of high permeability which tends to increased fibre retention, whereas another internal surface area of the mould may correspond with a zone of low permeability which tends to reduced fibre retention. The zones of different permeability may therefore by arranged to increase fibre retention at parts of the mould where the hollow moulded fibre product is typically otherwise thinner (e.g., the neck and shoulder of a bottle shaped precursor) and to reduce fibre retention at parts of the mould where the hollow moulded fibre product is typically otherwise thicker (e.g., the lower portion of the walls and the base). It will be appreciated that there is provided a control system 150 that is configured to cause a fibre suspension system 130 to fill a cavity of a mould with a fibre suspension according to a moulding procedure, and such that liquid from the cavity is removed through a plurality of zones of different permeability in order to provide different rates of liquid removal from the cavity during the moulding procedure; wherein the zones of different permeability are offset axially or circumferentially relative to an axis of the mould of an enclosure at least partially enclosing the mould. Figure 9 illustrates a method 800 of moulding a hollow moulded fibre product according to an example. The hollow moulded fibre product may be the bottle precursor 22 provided by the moulding system 100 described above with reference to Figure 2. However, the method 800 may be used to mould other types of hollow moulded fibre products and / or to control different moulding systems. The method 200 may be implemented using the moulding system 100 of Figure 2, and / or in conjunction with the mould 15 of Figure 1. The method 800 comprises, at block 810, receiving a flow of fibre suspension into a cavity of a mould comprising one or more internal surfaces that define the cavity within which the hollow moulded fibre product is to be moulded, the mould having a passageway that provides fluid communication between the cavity and an exterior of the mould. The method 800 comprises, at block 820, removing liquid from the cavity through the passageway into a spacing volume between the mould and an enclosure at least partially enclosing the mould in order to accumulate a body of liquid within the spacing volume and adjacent at least part of the exterior of the mould. This allows a body of liquid to accumulate within the spacing volume and adjacent at least part of the exterior of the mould. This liquid rises around the exterior of the mould as the cavity of the mould fills with the fibre suspension. As noted previously, this has the effect of retaining liquid in and around the pores of the mould whilst fibres continue to be introduced into the cavity during filling. Optionally, the presence of this retained liquid may reduce the likelihood of fibres sticking in pores of the mould and may improve the evenness of fibre deposition in the bottle precursor. This in turn may reduce fluffmess of an external surface of the moulded hollow moulded fibre product and may reduce or eliminate mould cleaning to remove stuck fibres. Optionally, the buffering effect of fluid inside and outside the mould may improve the deposition of fibres around the neck of a bottle-shaped precursor. It will be appreciated that there is provided a control system 150 that is configured to cause a fibre suspension system 130 to fill a cavity of a mould with a fibre suspension and removing liquid from the cavity into a spacing volume between the mould and an enclosure at least partially enclosing the mould in order to accumulate a body of liquid within the spacing volume and adjacent at least part of the exterior of the mould. Figure 10 shows a schematic diagram of a non-transitory computer-readable storage medium 900 according to an example. The non-transitory computer-readable storage medium 900 stores instructions 930 that, if executed by a processor 920 of a control system 910, cause the processor 920 to perform a method according to an example. In some examples, the control system 910 is or comprises the control system 150 as described above. The instructions 930 comprise: - receiving a fibre suspension into a permeable mould part defining a space within which the hollow moulded fibre product is mouldable from the fibre suspension, the permeable mould part defining an axis; - removing liquid from the space through a plurality of zones of different permeability of the permeable mould part, the plurality of zones of different permeability being offset axially or circumferentially relative to the axis along the permeable mould part, wherein the zones of different permeability are configured to provide different rates of liquid removal from the space. In other examples, the instructions 930 comprise: - receiving a flow of fibre suspension into a cavity of a mould comprising one or more internal surfaces that define the cavity within which the hollow moulded fibre product is to be moulded, the mould having a passageway that provides fluid communication between the cavity and an exterior of the mould - removing liquid from the cavity through the passageway into a spacing volume between the mould and an enclosure at least partially enclosing the mould in order to accumulate a body of liquid within the spacing volume and adjacent at least part of the exterior of the mould In other examples, the instructions 930 comprise instructions to perform any other example methods described herein. It will also be appreciated that there also is provided a receptacle manufacturing line (such as that shown in Figure 1) comprising a moulding system for moulding a hollow moulded fibre product and apparatus for performing at least one additional process on the hollow moulded fibre to provide the receptacle. Similarly, also provided is a method of manufacturing a receptacle, the method comprising a method of moulding a hollow moulded fibre product, and then performing at least one additional process on the hollow moulded fibre product to provide the receptacle. Examples of the “at least one additional process” are described above with reference to Figure 1. Also provided, as a result of the content of the present application, is use of a receptacle obtained by any of the methods described herein to contain contents. An example such receptacle 1000, in the form of a necked receptacle and specifically a bottle, containing contents 1010 is shown in Figure 11. The use could be, for example, by a person who puts the contents into the receptacle, by a person who transports the contents, or by a person who wishes to dispose of (for example, to a consumer or end user), offer to dispose of (for example, to a consumer or end user), import, or keep the contents whether for disposal or otherwise. The contents could, for example, be any one or more of the example contents described herein. Also provided is a method of providing a content-containing receptacle. An example such method 1100 is shown in Figure 12. The method 1100 comprises providing 1110 the receptacle, in the form of a necked receptacle and specifically a bottle, and then providing 1120 the contents in the receptacle. In this example, block 1120 follows block 1110, so that block 1120 comprises putting the contents into the receptacle that has been provided at block 1110. However, in some other examples, blocks 1110 and 1120 are performed concurrently, so that the providing 1110 the receptacle comprises providing the receptacle with the contents already present in the receptacle. The contents could, for example, be any one or more of the example contents described herein. The method 1100 also comprises closing 1130 an opening of the receptacle after block 1120, and applying 1140 a label or indicia to the receptacle after block 1130. In this example, block 1130 involves applying a heat seal to the opening and then screwing a cap or lid onto the receptacle, and block 1140 comprises adhering a label onto the receptacle. In respective other examples, the order of blocks 1130 and 1140 is reversed, blocks 1130 and 1140 are performed concurrently, block 1130 is omitted, and block 1140 is omitted. In some examples, block 1140 occurs before block 1120, orblock 1140 occurs during block 1120. For example, in some cases, the label or indicia is applied to the receptacle, then the contents are provided in the receptacle, and then the receptacle is closed. It will be appreciated that the method 1100 could be performed by the same party 5 that manufactures the receptacle, for example so that block 1110 comprises the method discussed above with reference to the manufacturing line shown in Figure 1. Alternatively, the method 1100 could be performed by a different party to that which manufactures the receptacle. In such an alternative, the different party performs block 1110 by way of obtaining the receptacle from the party that manufactures the receptacle 10 (such as by way of the method discussed above with reference to Figure 1) or from an intermediary. Example embodiments of the present invention have been discussed, with reference to the examples illustrated. However, it will be appreciated that variations and modifications may be made without departing from the scope of the invention as defined 15 by the appended claims.

Claims

1. A moulding system for moulding a hollow moulded fibre product from a fibre suspension, the moulding system comprising:a permeable mould part defining a space within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure in which liquid is removed from the space;wherein the permeable mould part defines an axis and comprises zones of different permeability which are offset axially and / or circumferentially relative to the axis along the permeable mould part, andwherein the zones of different permeability are configured to provide different rates of liquid removal from the space during the moulding procedure.

2. The moulding system of claim 1, wherein the permeable mould part comprises an enclosure for at least partially enclosing a mould, the mould comprising one or more internal surfaces that define a cavity within which the hollow moulded fibre product is moulded in use.

3. The moulding system of claim 2, wherein the enclosure comprises ports which are configurable to provide the zones of different permeability with different rates of liquid removal from within the enclosure.

4. The moulding system of claim 2 or claim 3, comprising the mould.

5. The moulding system of any one of claims 2 to 4, comprising a plurality of bafflespositioned between the enclosure and a mould at least partially enclosed by the enclosure, the plurality of baffles configured to define inter-baffle volumes between respective pairs of the baffles, at least two of which inter-baffle volumes correspond to the respective zones of different permeability.

6. The moulding system of claim 5, wherein each of the plurality of baffles is configured to extend from the enclosure to an exterior of the mould at least partially enclosed by the enclosure.

7. The moulding system of claim 5 or claim 6, wherein one or more of the pluralityof baffles comprises an opening connecting two of the inter-baffle volumes located on either side of the respective opening.

8. The moulding system of claim 1, wherein the permeable mould part comprises a mould having one or more internal surfaces that define a cavity, within which cavity the hollow moulded fibre product is moulded in use, wherein the internal surfaces of the mould define the shape of the hollow moulded fibre product.

9. The moulding system of any one of claims 1 to 8, comprising a control system configured to cause introduction of the fibre suspension into the space within which the hollow moulded fibre product is mouldable and to apply a negative pressure to the exterior of the mould part.

10. The moulding system of any one of claims 1 to 9, configured to mould an elongatehollow moulded fibre product, wherein the permeable mould part has:a first zone of permeability for an upper portion of the permeable mould part; and a second zone of permeability for a lower portion of the permeable mould part;wherein the first zone of permeability has a higher permeability than the second zone of permeability.

11. The moulding system of claim 10, wherein the permeable mould part has:a third zone of permeability for a bottom portion of the permeable mould part;wherein the third zone of permeability has a higher permeability than the second zone of permeability.

12. A mould for use in a moulding system for moulding a hollow moulded fibre product from a fibre suspension, the mould comprising:one or more internal surfaces that define a cavity, within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure in which liquid is removed from the cavity;wherein the mould defines an axis and comprises zones of different permeability which are offset axially and / or circumferentially relative to the axis along the mould; andwherein the zones of different permeability are configured to provide different rates of liquid removal from the cavity during the moulding procedure.

13. A method of using a mould for moulding a hollow moulded fibre product from a fibre suspension, the method comprising:receiving the fibre suspension into a cavity of the mould, the cavity defined by one or more internal surfaces of the mould and within which the hollow moulded fibre product is mouldable from the fibre suspension according to a moulding procedure, the mould defining an axis; andremoving liquid from the cavity through a plurality of zones of different permeability of the mould, the plurality of zones of different permeability being offset axially and / or circumferentially relative to the axis along the mould;wherein the zones of different permeability are configured to provide different rates of liquid removal from the cavity during the moulding procedure.

14. A method of moulding a hollow moulded fibre product from a fibre suspension, the method comprising:receiving the fibre suspension into a permeable mould part defining a space within which the hollow moulded fibre product is mouldable from the fibre suspension, the permeable mould part defining an axis; andremoving liquid from the space through a plurality of zones of different permeability of the permeable mould part, the plurality of zones of different permeability being offset axially and / or circumferentially relative to the axis along the permeable mould part;wherein the zones of different permeability are configured to provide different rates of liquid removal from the space.

15. The method of claim 14, wherein the permeable mould part comprises an enclosure for at least partially enclosing a mould comprising one or more internal surfaces that define a cavity and within which the hollow moulded fibre product is moulded in use, the enclosure comprising ports for removing liquid from the space; the method comprising:configuring the ports to provide the zones of different permeability with respective different rates of liquid removal.

16. The method of claim 14 or claim 15, wherein the hollow moulded fibre product comprises an elongate shape, the method comprising:providing a first zone of permeability for an upper portion of the permeable mould part; andproviding a second zone of permeability for a lower portion of the permeable mould part;wherein the first zone of permeability has a higher permeability than the second zone of permeability.

17. The method of claim 16, further comprising:providing a third zone of permeability for a bottom portion of the permeable mould part;wherein the third zone of permeability has a higher permeability than the second zone of permeability.

18. A control system configured to cause a moulding system to perform the method of any one of claims 14 to 17.

19. A non-transitory storage medium storing machine-readable instructions that, when executed by a processor of a control system, cause the processor to control a moulding system to perform the method of any one of claims 14 to 17.

20. A receptacle manufacturing line comprising the moulding system of any one of claims 1 to 11 for moulding the hollow moulded fibre product and apparatus forperforming at least one additional process on the hollow moulded fibre product to provide the receptacle.

21. A method of manufacturing a receptacle, the method comprising performing the method of any one of claims 14 to 17 to mould the hollow moulded fibre product, and then performing at least one additional process on the hollow moulded fibre product to provide the receptacle.

22. A method of providing a content-containing receptacle, the method comprising providing a receptacle obtained by the method of claim 21 and providing the contents in the receptacle to provide the content-containing receptacle.

23. The method of claim 22, comprising:closing an opening of the receptacle after the providing contents in the receptacle, and / orapplying a label or indicia to the receptacle.

24. Use of a receptacle obtained by the method of claim 21 to contain contents.

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