Cleaning of devices of an installation for producing containers comprising fibre-based materials

Abstract

The invention relates to an installation (10) for producing containers which consist of at least one fibre-based material or comprise at least one fibre-based material, wherein the installation (10) comprises a production machine (1), which is designed to form the containers, and a CIP / SIP device (2), which is designed to clean the production machine (1) with the aid of at least one cleaning and / or disinfecting agent. The invention further relates to an installation for producing containers which consist of at least one fibre-based material or comprise at least one fibre-based material, wherein the installation comprises a production machine, which is designed to form the containers and comprises a screen mould for forming the containers, and a device for cleaning the screen mould, which is arranged outside the production machine and is designed to clean the screen mould with the aid of at least one cleaning and / or disinfecting agent, in particular comprising one of an acid, a lye, hydrogen peroxide and water.

Description

[0001] Cleaning of equipment in a plant for the production of containers with fiber-based materials

[0002] Field of invention

[0003] The present invention relates to the manufacture of containers with fiber-based materials and in particular to the cleaning of various devices of a plant for the manufacture of containers which consist of or comprise fiber-based materials.

[0004] State of the art

[0005] Bottling plants for beverages or similar products comprise several production units connected in series, such as container manufacturing equipment, filling machines, labeling machines, and packaging machines. These can be designed, at least partially, as rotary machines coupled to one another by means of rotating transfer devices. Alternatively, at least some production units can also be designed as linear machines and / or connected to each other via linear transport systems, distribution systems, and product buffers.

[0006] Recently, there has been a growing interest in containers made from fiber-based materials (for example, paper or paper-based materials) for filling liquid products such as beverages, oils, sauces, or other liquid foodstuffs, as these are considered more environmentally friendly than containers made of glass or plastic. In particular, containers made from fiber-based materials can prove advantageous with regard to recycling.

[0007] However, the production of containers from fiber-based materials inevitably leads to contamination of various devices and components of the container manufacturing system by fibers. For example, screens used in wet manufacturing processes become clogged with the materials over time, necessitating periodic cleaning of the screen pores. Furthermore, contamination from wet fibers provides a breeding ground for bacteria, posing a risk of microbial contamination of the manufactured containers and, consequently, of products, especially food products, placed inside them.The present invention is based on the objective of comprehensively providing techniques for cleaning / disinfecting the devices / components of a plant for manufacturing containers from fiber-based materials or at least fiber-based materials.

[0008] Description of the invention

[0009] The above-mentioned problem is solved according to a first aspect by providing a plant for the manufacture of containers (for example, bottles) which consist of or comprise at least one fiber-based (for example, naturally organic or inorganic) material, wherein this plant comprises a manufacturing machine designed for forming the containers and a CIP / SIP (Cleaning-in-Place or Sterilization-in-Place) device designed for cleaning the manufacturing machine using at least one cleaning and / or disinfecting agent.

[0010] The containers can be made of cellulose from a wide variety of sources. These can include annual plants such as cotton, hemp, flax, jute, sisal, kenef, abaca, esparto, etc., as well as traditional wood pulp from hardwoods and softwoods. Bamboo, bagasse, cup plant, and other perennial plants can also serve as sources. Furthermore, secondary cellulose fibers (recycled material) can also be used.

[0011] The manufacturing machine for forming the containers can include a workstation for applying an inner coating to the inner wall of the containers and / or for applying an outer coating to the outer wall of the containers. The inner and / or outer coating can serve to ensure the tightness of the formed containers. The inner and / or outer coating can be a polymer material of various origins (fossil or bio-based), but alternatively, other barrier materials or technologies can also be used. These can also be of inorganic origin or generated, for example, through chemical surface modification of the cellulose fibers.

[0012] In particular, the manufacturing machine can be configured to form an outer pulp body using a flow-through process with a screen mold and subsequently to form a plastic inner body, for example from a corresponding preform, using stretch blow molding. With the aid of the CIP / SIP system, components of the plant, especially the manufacturing machine or its components, can be efficiently cleaned with at least one cleaning and / or disinfecting agent at intervals between the actual manufacturing phases.

[0013] According to further training, the CIP / SIP system of the plant comprises one or more tanks for storing water required to produce at least one cleaning and / or disinfecting agent, and a primary line connecting the tank to the production machine. Here and subsequently, a connection from one component of the plant to another includes the options of a direct connection as well as a connection via another component of the plant. Furthermore, the CIP / SIP system may include a heating device for heating the water supplied by the tank so that the at least one cleaning and / or disinfecting agent can be heated to a desired temperature for cleaning or disinfection purposes.

[0014] The cleaning and / or disinfecting agent may include at least one acid, one alkali, one hydrogen peroxide, and one water. It may also include other oxidizing disinfectants and cleaning agents (e.g., chlorine dioxide).

[0015] For example, the CIP / SIP system may include a device for adding at least one acid, an alkali, and hydrogen peroxide, or any suitable cleaning or disinfecting concentration, to the water supplied from the tank to provide the at least one cleaning and / or disinfecting agent. Of course, depending on the cleaning process, the water stored in the tank may also be used directly as the at least one cleaning and / or disinfecting agent without any further additives.

[0016] According to a further development, the manufacturing machine includes a screen mold for forming the containers, and it is equipped with a CIP / SIP system for cleaning the screen mold, in particular via spray channels and / or rinsing channels, whereby the spray channels and / or rinsing channels may be located outside the screen mold and / or as part of the screen mold. During the wet manufacturing process of the containers (see also the detailed description below), the pores of the screen mold become clogged over time, necessitating cleaning. The CIP / SIP system allows for the rapid and thorough in-place cleaning of the screen mold using at least one cleaning and / or disinfecting agent at intervals between the actual manufacturing phases.For efficient cleaning, the sieve mold can include external (i.e., not located inside the sieve mold where the pulp is introduced) spray channels and / or rinse channels, which are connected, for example, to the first line. In particular, the sieve mold can comprise a first sieve mold half and a second sieve mold half, and the spray channels and / or rinse channels on each of the first and second sieve mold halves can each form a supply line and a return line for the at least one cleaning and / or disinfecting agent. A sieve mold designed in this way allows for particularly fast and thorough cleaning using the CIP / SIP system, since the spray channels and / or rinse channels of the sieve mold enable targeted spraying / rinsing of the sieve mold pores.

[0017] According to a further development, the system also includes a pulper designed to break down the fibrous material used in the manufacturing machine for producing the containers, and a CIP / SIP device for cleaning the pulper. For this purpose, the pulper can be connected via a second line to the tank that stores the water required to provide at least one cleaning and / or disinfecting agent. The system can also include a pulp tank in which the pulp provided by the pulper can be temporarily stored until it is used in the manufacturing machine. Such a pulp tank can also be cleaned using the CIP / SIP device if necessary. Furthermore, a dosing device can be provided that, for example, adds a biocide to the pulp provided in the pulper or the pulp tank.

[0018] According to a second aspect, the aforementioned problem is also solved by providing a plant for the production of containers (for example, bottles) that consist of or comprise at least one fiber-based material, wherein the plant comprises a manufacturing machine configured for forming the containers and a screen mold for forming the containers, and a device for cleaning the screen mold, which is arranged outside the manufacturing machine and is configured for cleaning the screen mold (in the form of a cleaning-out-of-place (COP)) using at least one cleaning and / or disinfecting agent, in particular one comprising an acid, an alkali, hydrogen peroxide and water or other oxidative disinfecting and cleaning agents (e.g., chlorine dioxide).

[0019] According to this alternative solution, the cleaning of system components or components of these components does not take place "in place." Instead, for example, the screen mold of the production machine is completely or partially removed, transported to the screen mold cleaning device, and cleaned there for further use in container production within the production machine. It can be provided that automatically clogged screen halves are diverted from the production process for cleaning and replaced with clean ones, thus essentially avoiding downtime. The screen mold cleaning device can be part of a cleaning-out-of-place or sterilization-out-of-place system that also serves to clean other parts of system components.

[0020] The device for cleaning the sieve mold can be designed to clean the sieve mold via spray channels and / or rinsing channels. In particular, the device for cleaning the sieve mold can be designed to clean the sieve mold via spray channels and / or rinsing channels located externally (i.e., not inside the sieve mold where pulp is introduced to form the containers) and encompassed by the sieve mold. These channels, especially on a first and second sieve mold half or several sieve mold components, each form a supply line for the at least one cleaning and / or disinfecting agent and a return line for the at least one cleaning and / or disinfecting agent, in order to ensure rapid and thorough cleaning.

[0021] This alternative system may also include a tank for storing water required for the production of at least one cleaning and / or disinfecting agent, and in particular a device for heating the water supplied by the tank, as well as a device for adding at least one of an acid, an alkali and hydrogen peroxide or any suitable cleaning or disinfecting concentration to the water supplied by the tank.

[0022] According to a further development, the device for cleaning the sieve mold includes at least one cleaning bath and / or it is designed for cleaning the sieve mold by at least one of pickling, electropolishing, and ultrasonic cleaning.

[0023] In general, the operation of individual machines within the plant, as described in the examples above, particularly the CIP / SIP unit, the screen cleaning device, and the container forming machine, can be controlled by a control unit integrated into the plant. This control unit may incorporate artificial intelligence, specifically an artificial neural network. This allows self-learning systems to be effectively used to control the manufacturing and processing operations performed by the plant's machines.Furthermore, a sieve mold for a manufacturing machine for forming containers made of or comprising at least one fiber-based material is provided, wherein the sieve mold includes external spray channels and / or rinsing channels which, in particular on a first and second sieve mold half or several sieve mold components, each form a feed for a cleaning and / or disinfecting agent and a return for a cleaning and / or disinfecting agent. This sieve mold can be made of stainless steel or a material comprising stainless steel and can be manufactured by a 3D printing process. Alternatively, the sieve mold can be made of plastic, optionally also by a 3D printing process. The sieve mold can also be manufactured as a stainless steel wire mesh or a mesh made of nylon or a similar material.The sieve shape according to these examples can be used in the plant according to the examples described above, i.e., it can be part of the manufacturing machine.

[0024] Furthermore, processes for manufacturing containers made of or comprising at least one fiber-based material are provided using the system with the CIP / SIP device according to the first aspect described above, or its further developments. This process comprises the following steps:

[0025] Producing an initial number of containers using the manufacturing machine;

[0026] Cleaning the production machine using the CIP / SIP device after the production of the first number of containers; and

[0027] Producing a second batch of containers using the manufacturing machine after cleaning the manufacturing machine using the CIP / SIP device.

[0028] Furthermore, an alternative method for manufacturing containers made of or comprising at least one fiber-based material is provided using the system with the out-of-place sieve cleaning device, as described in the second aspect above, or its further developments. This method comprises the following steps:

[0029] Producing an initial number of containers using the manufacturing machine;

[0030] Transporting at least part of the sieve mold of the manufacturing machine to the device for cleaning the sieve mold after the production of the first number of containers;

[0031] Replacing at least part of the sieve mold transported to the sieve mold cleaning device with at least one corresponding clean part of a sieve mold; cleaning the at least part of the sieve mold transported to the sieve mold cleaning device by the sieve mold cleaning device; and

[0032] Producing a second number of containers using the manufacturing machine after replacing at least one part of the sieve mold transported to the device for cleaning the sieve mold with at least one corresponding clean part of a sieve mold.

[0033] In the following, embodiments of the present invention are described with reference to the drawing. The described embodiments are to be regarded in every respect as merely illustrative and not as limiting, and various combinations of the features mentioned are included in the invention.

[0034] Figure 1 schematically illustrates a plant for the production of containers which consist of at least one fiber-based material or comprise at least one fiber-based material, according to an embodiment of the present invention.

[0035] Figure 2 illustrates details of a cleaning technique for a sieve mold of a manufacturing machine designed to form containers made of or comprising at least one fiber-based material, according to an embodiment of the present invention.

[0036] The present invention provides a system for manufacturing containers, for example, a filling system for liquid products, in which containers are manufactured that consist of, or comprise, at least one fiber-based material, for example, paper, and which includes a device for cleaning at least one container manufacturing machine of the system or a screen of this container manufacturing machine using at least one cleaning and / or disinfecting agent. Cleaning the (screen of the) container manufacturing machine enables the rapid and reliable production of the containers, for example, pulp bottles.

[0037] An exemplary plant 10 is shown in Figure 1. The plant 10 for the production of containers comprises a manufacturing machine 1 for forming containers that consist of or comprise at least one fiber-based material. For example, the manufacturing machine 1 for forming containers can be configured to produce fiber-based containers, such as fiber-based bottles. The manufacturing machine 1 can be configured to produce cellulose containers, for example, paper containers with a predetermined grass fiber content. The grass fiber content can, for example, be up to 40%.

[0038] In principle, cellulose can come from a wide variety of sources. These can include annual plants such as cotton, hemp, flax, jute, sisal, kenef, abaca, esparto, etc., as well as traditional wood pulp from deciduous and coniferous trees. Bamboo, bagasse, cup plant, and other perennial plants can also serve as sources. Furthermore, secondary cellulose fibers (recycled material) can also be used.

[0039] The manufacturing machine 1 for forming containers of plant 10 can, for example, be configured to perform the following process steps. A pulp containing fibers (a fiber-containing suspension) is fed to a (negative) sieve mold / flow mold 1a, wherein the sieve mold 1a can comprise a mold wall partially surrounding a mold interior and a mold opening connecting the mold interior with the surroundings of the sieve mold 1a, wherein the mold wall is at least partially less permeable to fibers compared to the liquid pulp.

[0040] Pulp is introduced into the mold cavity through the mold opening, as shown in the left-hand illustration of Figure 2, and the liquid (typically water) of the pulp is at least partially removed from the mold cavity by the mold wall, so that the fibers overlap the mold wall on the side facing the mold cavity. A forming container blank can be contacted in the manufacturing machine 1 with a gas or a solid, or both, at a temperature in the range of 50 to 300 °C.

[0041] The containers produced in production machine 1 can be provided with an internal and / or external coating in the same machine or subsequently. The internal and / or external coating can serve to ensure the container's watertightness.

[0042] The system 10 can comprise a plurality of parallel-operating production machines 1, and the containers produced by these plurality of parallel-operating production machines 1 can be combined for further processing. Thus, a relatively high throughput can be achieved even with a relatively low production cycle time. Furthermore, the system 10 shown in Figure 1, according to the invention, comprises a cleaning-in-place or sterilization-in-place (CIP / SIP) device 2. This CIP / SIP device 2 serves to clean or sterilize various components of the system 10 "in place" (i.e., without removing the parts of these components to be cleaned for cleaning), for example, the production machine 1, with at least one cleaning and / or disinfecting agent in phases between the actual production phases of the containers.While in the embodiment shown in Figure 1 the CIP / SIP device 2 is integrated into the system 10, it can alternatively be connected externally to the periphery of the system 10.

[0043] Figure 2 illustrates exemplary techniques for cleaning and / or sterilizing the sieve mold 1a using the CIP / SIP device 2. Since pulp, as shown in the left-hand illustration of Figure 2, is pressed into the sieve mold 1a from below, and water is squeezed out through the pores of the sieve mold during container production, the pores become clogged over the course of several individual container production processes. These pores can be cleaned by forcing the aforementioned cleaning and / or disinfecting agent through the pores using the CIP / SIP device 2. The cleaning and / or disinfecting agent can be forced through the pores of the sieve mold 1a from the outside in, as shown in the middle illustration of Figure 2, or it can be forced through the pores of the sieve mold 1a from the inside out, as shown in the right-hand illustration of Figure 2.In the first variant, corresponding spray channels and / or rinsing channels can be provided for targeted spraying / rinsing of the pores of the sieve shape 1a, for example, arranged symmetrically around the sieve shape 1a. In the latter variant, according to one embodiment, a nozzle rod can be inserted into the sieve shape 1a, from which at least one cleaning and / or disinfecting agent for cleaning the pores of the sieve shape 1a emerges.

[0044] The CIP / SIP device 2 comprises a (CIP / SIP) tank 2a for storing water required for the production of at least one cleaning and / or disinfecting agent. Furthermore, the CIP / SIP device 2 comprises a device 2b for adding cleaning or disinfecting concentrates, such as one or more acids and / or alkalis and / or hydrogen peroxide, etc., to the water supplied by tank 2a in order to obtain the at least one cleaning and / or disinfecting agent required for cleaning and / or sterilization. In addition, the CIP / SIP device 2 of Annex 10, in the embodiment shown in Figure 1, comprises a heating device 2c by means of which the water supplied by tank 2a for the production of the at least one cleaning or disinfecting agent can be heated to a temperature desired for the at least one cleaning and / or disinfecting agent.

[0045] The system 10 further comprises a pulper 3 for breaking down the required fibrous material, which is fed to the pulper 3, for example, in the form of bales or sheets. This pulper 3 can also be cleaned as needed using the CIP / SIP device 2. The pulp produced by the pulper 3 can be temporarily stored in a pulp tank 4. This pulp tank 4 can also be cleaned as needed using the CIP / SIP device 2. Furthermore, in the illustrated embodiment, a dosing device 5 is provided, by means of which a biocide can be added to the pulp.

[0046] The components / device included in Annex 10 are, as shown, suitably connected to one another via (pipe or hose) lines equipped with control / regulating valves. These lines can also be cleaned as needed using the CIP / SIP device 2. For example, the CIP / SIP device 2 can be configured for pigging the lines. Media can be transported via appropriate pumping devices. Using the pumping devices, the media can be circulated through the desired components for a desired time, thus achieving effective cleaning of organic and inorganic residues.

[0047] Although not shown in Figure 1, the system 10 can include further components. For example, the system 10 can include a decoration machine to which the containers formed in the manufacturing machine 1 are fed for decoration. The decoration can be carried out by labeling and / or printing on the containers. The decoration machine can be configured to label the containers using cold glue or hot glue by roller or spray application (GlueJet), or APS labeling.

[0048] The decorated containers can undergo a post-treatment process in a finishing machine to dry or cure the printed media and / or labels. Such a finishing machine may, for example, include a heat emitter, such as an infrared source, to dry water-based or latex-based ink applied to the containers.

[0049] The labeling and / or printing of the containers can be checked in a control machine of system 10. Containers that fall below minimum quality standards with regard to their printing or labeling can be rejected and, for example, recycled. Furthermore, system 10 can include a filling machine for filling the containers produced in production machine 1 and a capping machine for closing the filled containers, for example with crown caps, a Talog closure, or screw caps made of metal or plastic, or by heat-sealing the opening with aluminum foil, plastic, or paper fiber.

[0050] Finally, the sealed, filled containers can be packed in a packaging machine of plant 10.

[0051] Depending on requirements, the containers can be cooled during transport from one of the machines in plant 10 to another. Cooling can be achieved using a cooled gas (such as air or nitrogen) applied to the containers.

[0052] The operation of the individual working machines of plant 10 as well as facilities for transporting the containers between the working machines can be controlled / regulated by a control / regulation unit, wherein the control / regulation unit may include an artificial intelligence, which is designed, for example, in the form of an artificial neural network consisting of one or more artificial neurons arranged in one or more neural layers.

[0053] According to a further embodiment, the CIP / SIP device 2 of system 10 is replaced by, or at least supplemented with, a cleaning-out-of-place or sterilization-out-of-place (COP / SOP) device. This COP / SOP device serves to clean or sterilize various components of system 10 "out-of-place" (i.e., after removing the parts of these components to be cleaned, for cleaning purposes, and transferring the parts to be cleaned outside the respective component). For example, a screen mold of a manufacturing machine is completely or partially removed from the manufacturing machine, transferred to the COP / SOP device, and cleaned there with at least one cleaning and / or disinfecting agent. For cleaning, the COP / SOP device can include at least one cleaning bath and / or it can be configured to clean the screen mold by at least one of the following processes: pickling, electropolishing, and ultrasonic cleaning.

[0054] Furthermore, both the sieve mold used in the embodiment illustrated in Figure 1 with a CIP / SIP device 2 and the sieve mold used in the further embodiment with a COP / SOP device for forming containers of a system can be designed to be suitable for cleaning by including externally formed spray channels and / or rinsing channels, which, in particular on a first and second half of the sieve mold, each form a supply line for the at least one cleaning and / or disinfecting agent and a return line for the at least one cleaning and / or disinfecting agent. A sieve mold designed in this way can be manufactured cost-effectively and accurately using a 3D printing process. For example, such a sieve mold can be manufactured from stainless steel or from a material comprising stainless steel using the 3D printing process.In particular, manufacturing the stainless steel screen using 3D printing allows for the formation of externally arranged spray channels and / or rinse channels close to the actual, porous screen structure, with individual small outlet holes. These spray channels and / or rinse channels can, for example, follow the contour of the screen without obstructing the pore structure. Alternatively, the screen can be made of plastic, possibly also using a 3D printing process. The screen can also be manufactured as a stainless steel wire mesh or a mesh made of nylon or a similar material.

Claims

Patent claims 1. A plant (10) for the manufacture of containers which consist of or comprise at least one fiber-based material, wherein the plant (10) comprises: a manufacturing machine (1) configured for forming the containers; and a CIP / SIP device (2) configured for cleaning and / or disinfecting the manufacturing machine (1) using at least one cleaning and / or disinfecting agent.

2. The system (10) according to claim 1, in which the CIP / SIP device (2) comprises a tank (2a) for storing water required for the production of the at least one cleaning and / or disinfecting agent and a first line through which the tank is connected to the production machine (1).

3. The system (10) according to claim 2, in which the CIP / SIP device (2) further comprises a heating device (2c) for heating the water supplied by the tank (2a).

4. The system (10) according to one of the preceding claims, in which the manufacturing machine (1) comprises a sieve mold (1a) for forming the containers, and the CIP / SIP device (2) is designed for cleaning the sieve mold (1a), in particular via spray channels and / or rinsing channels.

5. The apparatus (10) according to claim 4, in which the sieve shape (1a) comprises external spray channels and / or rinsing channels.

6. The system (10) according to claim 5, wherein the sieve mold (1a) comprises a first sieve mold half and a second sieve mold half, and the spray channels and / or rinsing channels on each of the first and second sieve mold half each form a feed for the at least one cleaning and / or disinfecting agent and a return for the at least one cleaning and / or disinfecting agent.

7. The system (10) according to one of the preceding claims, further comprising a pulper configured to form a pulp which serves the manufacturing machine (1) for the production of the containers, and wherein the CIP / SIP device (2) is configured to clean the pulper.

8. The system (10) according to one of the preceding claims, in which the at least one cleaning and / or disinfecting agent comprises at least one of an acid, an alkali, hydrogen peroxide and water.

9. A plant for the manufacture of containers consisting of or comprising at least one fiber-based material, wherein the plant comprises: a manufacturing machine configured for forming the containers and comprising a sieve mold for forming the containers; and a device for cleaning the sieve mold, arranged outside the manufacturing machine and configured for cleaning the sieve mold using at least one cleaning and / or disinfecting agent, in particular comprising an acid, an alkali, hydrogen peroxide and water.

10. The system according to claim 9, in which the device for cleaning the sieve mold is designed for cleaning the sieve mold via spray channels and / or rinsing channels.

11. The system according to claim 9 or 10, in which the device for cleaning the sieve mold is designed to clean the sieve mold via spray channels and / or rinsing channels encompassed externally by the sieve mold, which in particular form a supply line for the at least one cleaning and / or disinfecting agent and a return line for the at least one cleaning and / or disinfecting agent on a first and second sieve mold half of the sieve mold.

12. The system according to one of claims 9 to 11, further comprising a tank for storing water required for the production of at least one cleaning and / or disinfecting agent and in particular a device for heating the water supplied by the tank.

13. The system according to one of claims 9 to 12, wherein the device for cleaning the sieve mold comprises at least one cleaning bath and / or is designed for cleaning the sieve mold by at least one of pickling, electropolishing, and ultrasonic cleaning.

14. A sieve mold (1a) for a manufacturing machine (1) for forming containers made of or comprising at least one fiber-based material, wherein the sieve mold (1a) comprises external spray channels and / or rinsing channels, in particular on a first and second sieve- Each half of the sieve mold forms a feed for a cleaning and / or disinfecting agent and a return for a cleaning and / or disinfecting agent.

15. The sieve mold (1a) according to claim 14, wherein the sieve mold (1a) is made of stainless steel or a material comprising stainless steel and is manufactured by a 3D printing process.

16. Method for producing containers consisting of or comprising at least one fiber-based material, using the apparatus (10) according to any one of claims 1 to 8, comprising the steps: Producing an initial number of containers using the manufacturing machine (1); Cleaning the manufacturing machine (1) using the CIP / SIP device (2) after the production of the first number of containers; and Producing a second number of containers using the manufacturing machine (1) after cleaning the manufacturing machine (1) using the CIP / SIP device (2).

17. Method for producing containers consisting of or comprising at least one fiber-based material, using the apparatus (10) according to any one of claims 9 to 13, comprising the steps: Producing an initial number of containers using the manufacturing machine; Transporting at least part of the sieve mold of the manufacturing machine to the device for cleaning the sieve mold after the production of the first number of containers; Replacing at least part of the sieve mold transported to the device for cleaning the sieve mold with at least one corresponding clean part of a sieve mold; Cleaning of at least part of the sieve mold transported to the sieve mold cleaning device by the sieve mold cleaning device; and Producing a second number of containers using the manufacturing machine after replacing at least one part of the sieve mold transported to the device for cleaning the sieve mold with at least one corresponding clean part of a sieve mold.

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