Method and apparatus for supplying a layer of unused multi-layer tape to a production line of absorbent hygiene articles

Abstract

To provide a method and apparatus for feeding a production line of absorbent sanitary articles with a layer of a virgin multilayer tape.SOLUTION: A method for feeding a production line of absorbent sanitary articles with a layer of a virgin multilayer tape includes: providing a head free end of the virgin multilayer tape partially unwound from a corresponding virgin spool; providing a tail free end of a multilayer tape in use; applying a first connecting element onto a first layer of the virgin multilayer tape and onto a first layer of the multilayer tape in use at the head free end and tail free end; applying a second connecting element onto a second layer of the virgin multilayer tape and onto a second layer of the multilayer tape in use at the head free end and tail free end; pulling the first layer of the virgin multilayer tape in a first direction; and pulling the second layer of the virgin multilayer tape in a second direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for supplying a layer of unused multilayer tape to a production line of absorbent hygiene articles.

Background Art

[0002] Absorbent hygiene articles are, for example, sanitary pads for women, diapers for babies, and diapers and pads for people suffering from incontinence. In the following description, a non-limiting example of a sanitary pad for women is mentioned.

[0003] Structurally, a sanitary pad for women comprises a lower layer (i.e., a backsheet), an upper layer (i.e., a topsheet) joined thereto, and an absorbent core sandwiched between the lower layer and the upper layer. The sanitary pad for women further comprises two flaps that can be formed by the lower layer and / or the upper layer. To improve the stability of the pad, the flaps can be folded back when the pad is attached to the underwear worn by the user.

[0004] One or more adhesive portions are disposed on the lower layer to fix the pad to the underwear worn by the user. The adhesive portions are usually disposed on the central portion of the pad and on the flaps.

[0005] Typically, the adhesive portion comprises an adhesive layer applied on the lower layer and a cover sheet (i.e., release paper) covering a part of the adhesive layer. The cover sheet is typically made of paper and can be removed to expose the adhesive when the pad is attached. The cover sheet is configured such that the adhesive remains on the lower layer of the pad when the cover sheet is removed.

[0006] The applicant has observed that in some processes for manufacturing absorbent hygiene articles, at least some of the above-described layers or sheets can be obtained from a multi-layer tape wound around respective spools. In this case, in order to supply only one of the said layers / sheets (hereinafter referred to as the "target layer") to the production line of the absorbent hygiene article, it is necessary to separate the various layers / sheets of each multi-layer tape unwound from each spool.

[0007] The applicant has also observed that in the above-described process, when the spool of the multi-layer tape is used up, in order to continue supplying the target layer to the production line, it is necessary to unwind a new multi-layer tape from a new unused spool.

[0008] The applicant has realized that it is possible to supply the target layer of the new multi-layer tape unwound from a new unused spool by joining the new multi-layer tape to the multi-layer tape in use.

[0009] The applicant has also realized that in order to separate two layers of a new multi-layer tape (hereinafter referred to as the first layer and the second layer), by pulling the two layers of the multi-layer tape in use in the diverging direction, the two layers of the unused multi-layer tape are also pulled in the diverging direction and thereby separated from each other, so that it is possible to join both the first layer of the multi-layer tape in use and the first layer of the unused multi-layer tape, and the second layer of the multi-layer tape in use and the second layer of the unused multi-layer tape. SUMMARY OF THE INVENTION

[0010] Accordingly, in a first aspect, the present invention relates to a method for supplying a layer of an unused multi-layer tape to a production line of an absorbent hygiene article.

[0011] Preferably, a free head end of the unused multi-layer tape partially unwound from each unused spool is provided.

[0012] Preferably, a free end of the tail of the multi-layer tape in use is provided.

[0013] Preferably, the first connecting element is attached onto the first layer of the unused multi-layer tape and the first layer of the multi-layer tape in use at the free end of the head and the free end of the tail.

[0014] Preferably, the second connecting element is attached onto the second layer of the unused multi-layer tape and the second layer of the multi-layer tape in use at the free end of the head and the free end of the tail.

[0015] Preferably, the first layer of the unused multi-layer tape is pulled in the first direction by advancing the first layer of the multi-layer tape in use and the first connecting element in the first direction.

[0016] Preferably, the second layer of the unused multi-layer tape is pulled in the second direction by advancing the second layer of the multi-layer tape in use and the second connecting element in the second direction.

[0017] Preferably, the second direction branches off from the first direction.

[0018] By attaching the first connecting element and the second connecting element, the first layer of the multi-layer tape in use and the first layer of the unused multi-layer tape are joined.

[0019] By attaching the second connecting element, the second layer of the multi-layer tape in use and the second layer of the unused multi-layer tape are joined.

[0020] By separating the first layer of the multilayer tape in use from the second layer of the multilayer tape in use in the branching direction, the first layer of the unused multilayer tape and the second layer of the unused multilayer tape are pulled in the branching direction, whereby the first layer of the unused multilayer tape and the second layer of the unused multilayer tape are separated. In this way, the first layer of the unused multilayer tape is separated from the second layer of the unused multilayer tape, and one of these layers can be supplied to the production line of the absorbent article.

[0021] In its second aspect, the present invention relates to an apparatus for supplying one layer of an unused multilayer tape to a production line of absorbent hygiene articles.

[0022] Preferably, a first holding device is provided, and the first holding device is configured to hold the free head end of the unused multilayer tape partially unwound from each unused spool.

[0023] Preferably, a second holding device is provided, and the second holding device is configured to hold the free tail end of the multilayer tape in use.

[0024] Preferably, a first applicator is provided, and the first applicator is configured to apply a first connecting element onto the first layer of the unused multilayer tape and the first layer of the multilayer tape in use at the free head end and the free tail end.

[0025] Preferably, a second applicator is provided, and the second applicator is configured to apply a second connecting element onto the second layer of the unused multilayer tape and the second layer of the multilayer tape in use at the free head end and the free tail end.

[0026] Preferably, a first pulling member is provided, and the first pulling member is configured to pull the first layer of the unused multilayer tape in a first direction by advancing the first layer of the multilayer tape in use and the first connecting element in the first direction.

[0027] Preferably, a second pulling member is provided, and the second pulling member is configured to pull the second layer of the unused multilayer tape in a second direction by advancing the second layer of the multilayer tape in use and the second connecting element in the second direction.

[0028] Preferably, the second direction branches from the first direction.

[0029] The term "tape" is used to denote a body having a length measured along each longitudinal length, a width measured along each transverse direction orthogonal to the longitudinal direction, and a thickness measured along each vertical direction orthogonal to the longitudinal and transverse directions, the length being at least two orders of magnitude greater than the width, and the thickness being at least two orders of magnitude less than the width.

[0030] The term "free end" of a multilayer tape (unused or in use) is used to denote the longitudinal end of the tape, where the tape has an edge extending substantially in the transverse direction.

[0031] In both of the above-described aspects, the present invention can have at least one of the preferred features described below. Thus, such features may exist individually or in combination with each other in both the method of the first aspect of the present invention and the apparatus of the second aspect of the present invention, unless otherwise specified.

[0032] Preferably, the method of the first aspect of the present invention can be implemented by an apparatus according to the second aspect of the present invention.

[0033] Preferably, the unused multilayer tape comprises a first layer and a second layer overlapping the first layer.

[0034] Preferably, the multilayer tape in use comprises a first layer and a second layer overlapping the first layer.

[0035] For example, in a preferred embodiment such as the embodiment shown in the accompanying drawings, the layer supplied to the production line is the second layer of the unused multilayer tape. In such an embodiment, the second layer of the unused multilayer tape and the second layer of the multilayer tape in use comprise a main layer with an adhesive substrate, and the first layer of the unused multilayer tape and the first layer of the multilayer tape in use comprise a removable protective layer that covers the adhesive substrate of the main layer.

[0036] In an alternative embodiment not shown in the accompanying drawings, the layer supplied to the production line is the first layer of the unused multilayer tape. In such an embodiment, the first layer of the unused multilayer tape and the first layer of the multilayer tape in use comprise a main layer with an adhesive substrate, and the second layer of the unused multilayer tape and the second layer of the multilayer tape in use comprise a removable protective layer that covers the adhesive substrate of the main layer.

[0037] In a particularly preferred embodiment, the above-mentioned main layer defines a cover sheet provided with an adhesive intended for application to the lower layer of the absorbent sanitary article.

[0038] The applicant has actually observed that conventionally, during the manufacture of absorbent sanitary articles, the adhesive substrate is applied onto the lower layer or the cover sheet of the absorbent sanitary article, and then the cover sheet is applied onto the lower layer of the absorbent sanitary article such that the adhesive substrate remains sandwiched between the lower layer of the absorbent sanitary article and the cover sheet.

[0039] In markets that are more susceptible to the impact of environmental problems, legislators and consumers prefer biodegradable products.

[0040] Biodegradable types of sanitary pads are nowadays made to be discarded into the toilet bowl and dissolved in water within a few days, or weeks, or months. In these products, the lower layer is made of a biodegradable fibrous material, for example, carboxymethylcellulose (CMC).

[0041] Therefore, the applicant considered applying a biodegradable and water-soluble adhesive onto the lower layer of the absorbent article.

[0042] Typically, biodegradable adhesives are aqueous and in a liquid state at room temperature, and are typically different from conventional adhesives that are based on synthetic substances and are solid at room temperature.

[0043] The applicant has verified that when a biodegradable adhesive is applied in a liquid state onto the lower layer of a pad made of biodegradable fibrous material, the adhesive is absorbed by the fibrous material and penetrates into the lower layer, significantly deteriorating the adhesion performance of the bonded part. Furthermore, the adhesive absorbed by the lower layer risks hardening the sanitary pad and deteriorating the comfort of the sanitary pad.

[0044] The applicant has found that by allowing the biodegradable adhesive to partially dry before applying it onto the lower layer, the adhesive tends to be absorbed by the fibrous material in a smaller amount and remain on the surface, maintaining its adhesion performance.

[0045] Therefore, the applicant considered that in order to allow the biodegradable adhesive to partially dry before application, it is possible to attach the adhesive substrate onto the main layer from which the cover sheet is separated before applying it onto the lower layer of the absorbent article, and to attach one or more cover sheets with the partially dried biodegradable adhesive substrate already attached onto the lower layer of the absorbent article.

[0046] The applicant has found that it is possible to cover the adhesive substrate with a removable protective layer for transporting and storing the main layer onto which the adhesive has already been applied, and to obtain a multilayer tape that can be wound onto a spool without damaging the adhesive substrate. When applying, the multilayer tape can be unwound from the spool, the protective layer is removed for disposal, the main layer provides the adhesive substrate to be supplied to the production line of the absorbent article, and the main layer is cut to obtain the cover sheet to be attached to the lower layer.

[0047] Preferably, the step of attaching the second connecting element is performed after attaching the first connecting element.

[0048] Preferably, the step of attaching the first connecting element is performed while the head free end and the tail free end are stationary.

[0049] Preferably, the head free end and the tail free end are moved after attaching the first connecting element and before attaching the second connecting element.

[0050] Preferably, the multi-layer tape in use and the unused multi-layer tape can be advanced along the forward path.

[0051] Preferably, the device is configured to advance the multi-layer tape in use and the unused multi-layer tape along the forward path.

[0052] Preferably, the second connecting element is attached while the head free end and the tail free end are moving along the forward path.

[0053] Preferably, the second applicator is disposed downstream of the first applicator along the forward path.

[0054] Preferably, the second applicator is configured to attach the second connecting element following the first connecting element.

[0055] Preferably, the second applicator is configured to attach the second connecting element while the head free end and the tail free end are moving along the forward path.

[0056] Preferably, a sensor is provided.

[0057] Preferably, the first connecting element that has already been attached is detected by the sensor.

[0058] Preferably, the first connection element is detected while the first connection element is moving along the forward path.

[0059] Preferably, the sensor is configured to detect the first connection element attached on the first layer of the unused multi-layer tape and the first layer of the multi-layer tape in use at the free end of the head and the free end of the tail.

[0060] Preferably, the sensor is arranged along the forward path between the first applicator and the second applicator.

[0061] Preferably, the step of attaching the second connection element is performed when the sensor detects the first connection element.

[0062] Preferably, the step of attaching the second connection element is performed at a predetermined time after the sensor detects the first connection element so that the second connection element is attached to the first connection element.

[0063] Preferably, the second applicator is configured to attach the second connection element when the sensor detects the first connection element.

[0064] Preferably, the second applicator is configured to attach the second connection element at the predetermined time after the sensor detects the first connection element.

[0065] Preferably, the first connection element and the second connection element do not overlap each other when attached.

[0066] Preferably, the step of attaching the first connection element includes arranging the free end of the head of the unused multi-layer tape at a position adjacent to the free end of the tail of the multi-layer tape in use without overlapping the free end of the head with the free end of the tail.

[0067] Preferably, the step of disposing the head free end of the unused multi-layer tape at a position adjacent to the tail free end of the multi-layer tape in use includes disposing the head free end of the unused multi-layer tape at a distance of less than 5 mm from the tail free end of the multi-layer tape in use, and preferably, the distance is less than 3 mm.

[0068] In one embodiment, the step of disposing the head free end of the unused multi-layer tape at a position adjacent to the tail free end of the multi-layer tape in use includes disposing the head free end of the unused multi-layer tape that contacts the tail free end of the multi-layer tape in use without overlapping them.

[0069] In one embodiment, the step of attaching the first connecting element onto the first layer of the unused multi-layer tape and the first layer of the multi-layer tape in use includes attaching the first connecting element onto the first layer of the unused multi-layer tape and the first layer of the multi-layer tape in use simultaneously.

[0070] In other embodiments, the step of attaching the first connecting element includes, at the head free end, attaching the first connecting element only onto the first layer of the unused multi-layer tape, moving the first connecting element and the head free end of the unused multi-layer tape towards the tail free end of the multi-layer tape in use, and then, at the tail free end, attaching the first connecting element onto the first layer of the multi-layer tape in use.

[0071] Preferably, by supplying the main layer of the unused multi-layer tape to the production line of the absorbent sanitary article, the unused spool becomes the spool in use.

[0072] Preferably, every time the spool in use is used up, the method according to the first aspect is repeated.

[0073] Preferably, for each iteration occurring subsequent to the first iteration of the method according to the first aspect, the step of attaching the first connecting element onto the first layer of the unused multilayer tape and the first layer of the used multilayer tape includes, in the previous iteration, when the step of attaching the first connecting element includes the step of attaching the first connecting element only onto the first layer of the unused multilayer tape at the head free end, the step of moving the first connecting element and the head free end of the unused multilayer tape towards the tail free end of the used multilayer tape, and then, at the tail free end, the step of attaching the first connecting element onto the first layer of the used multilayer tape, the step of attaching the first connecting element onto the first layer of the unused multilayer tape and the first layer of the used multilayer tape simultaneously.

[0074] Preferably, for each iteration occurring subsequent to the first iteration of the method according to the first aspect, the step of attaching the first connecting element onto the first layer of the unused multilayer tape and the first layer of the used multilayer tape includes, in the previous iteration, when the step of attaching the first connecting element includes the step of attaching the first connecting element onto the first layer of the unused multilayer tape and the first layer of the used multilayer tape simultaneously, the step of attaching the first connecting element only onto the first layer of the unused multilayer tape at the head free end, the step of moving the first connecting element and the head free end of the unused multilayer tape towards the tail free end of the used multilayer tape, and then, at the tail free end, the step of attaching the first connecting element onto the first layer of the used multilayer tape.

[0075] In one embodiment, the step of attaching the first connecting element includes the step of pressing a first applicator against the head free end and the first holding device.

[0076] Preferably, the step of attaching the first connecting element includes the step of pressing a first applicator against the tail free end and the second holding device.

[0077] Preferably, the step of attaching the second connecting element includes pressing a second applicator against the free head end and the free tail end and against the opposing abutting elements.

[0078] Preferably, the first applicator and the second applicator are arranged on both sides of the forward path.

[0079] Preferably, the step of attaching the first connecting element includes holding the first connecting element on the first applicator while the first applicator moves towards the free head end and the free tail end.

[0080] Preferably, the step of attaching the second connecting element includes holding the second connecting element on the second applicator while the second applicator moves towards the free head end and the free tail end.

[0081] Preferably, the first connecting element comprises at least one adhesive sheet.

[0082] Preferably, the second connecting element comprises at least one adhesive sheet.

[0083] Preferably, the step of providing the free tail end of the multilayer tape in use includes at least partially unwinding the multilayer tape in use from each spool in use and laterally cutting the multilayer tape in use.

[0084] Preferably, a knife configured to laterally cut the multilayer tape in use is provided.

[0085] Preferably, the step of providing the free head end of the unused multilayer tape includes holding the free head end with a first holding device.

[0086] Alternatively, the step of providing the free head end of the unused multilayer tape includes the step of holding the free head end on a first applicator.

[0087] Preferably, the step of providing the free tail end of the multilayer tape in use includes the step of holding the free tail end with a second holding device.

[0088] Preferably, the first applicator is movable between respective rest positions and respective application positions.

[0089] Preferably, the second applicator is movable between respective rest positions and respective application positions.

[0090] Preferably, the first and / or second tension members include at least one attracted motor roller.

[0091] Preferably, the sensor controls the movement of the second applicator.

[0092] Preferably, the first holding device and the second holding device are configured to align the free head end and the free tail end along a common lying plane.

[0093] Preferably, the first applicator and the second applicator are configured to move between respective rest positions and respective application positions on opposing components with respect to the forward path.

[0094] Further features and advantages of the present invention will become apparent from the following detailed description of its preferred embodiments, which is made with reference to the accompanying drawings and provided by way of illustrative and non-limiting examples.

Brief Description of the Drawings

[0095]

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Embodiments for Carrying Out the Invention

[0096] In the accompanying drawings, reference numeral 100 is used to indicate the device according to the present invention. The device 100 is configured to supply the main layer 47 of the multilayer tape 46 in use to the production line 200 of absorbent sanitary articles (schematically shown in FIG. 1), and then to supply the main layer 57 of the unused multilayer tape 56.

[0097]

[0098] ​In production line 200, which is not shown in detail, a plurality of semi-finished products of absorbent sanitary articles are being processed. The main layer 47 and the subsequent main layer 57 are continuously supplied from the apparatus 100 to the production line 200, and they are cut into separate sheets (not shown) that are rectangular or square, each comprising a part of the main substrate covered with a part of the adhesive substrate.

[0099] Non-limiting examples of absorbent sanitary articles manufactured on production line 200 are sanitary pads for women, baby diapers, diapers or pads for people suffering from incontinence, etc. Such absorbent sanitary articles (not shown) comprise a superposed upper layer and a lower layer, between which a core of absorbent material is sandwiched. The lower layer is made of a non-woven fabric, preferably a material based on biodegradable cellulose.

[0100] In production line 200, one or more separate sheets obtained by cutting the main layers 47, 57 are attached to each semi-finished product of the absorbent article, so that the adhesive of each adhesive substrate adheres to the lower layer and remains stuck to the surface of the lower layer. The adhesive of each adhesive substrate has sufficient stickiness to remain on the surface and soaks into the lower layer in a significant amount.

[0101] Each main substrate is configured such that a part of the main substrate of each separate sheet is weakly held on the lower layer of the absorbent article by the adhesive of the respective adhesive substrate, performing the function of protecting the adhesive. Next, the absorbent sanitary article is packaged with each main substrate still held on the lower layer, so that each main substrate can be removed by the end consumer when using the absorbent sanitary article.

[0102] Each main layer 47, 57 is stored, transported, and protected within its respective spool 45, 55. Each multi-layer tape 46, 56 is wound around its respective spool 45, 55. In FIG. 1, the multi-layer tape 46 (hereinafter referred to as the "in-use multi-layer tape") can be advanced along the forward path P to be fed out from the spool 45 (hereinafter referred to as the "in-use spool") to supply the main layer 47 to the production line 200. The multi-layer tape 56 (hereinafter referred to as the "unused multi-layer tape") can be advanced along the forward path P to be fed out from the spool 55 (hereinafter referred to as the "unused spool") to supply the main layer 57 to the production line 200 when the main layer 47 is used up.

[0103] Each multi-layer tape 46, 56 includes its respective main layer 47, 57 and its respective protective layer 40, 50 that is overlapped with the adhesive substrate of its respective main layer 47, 57 to protect the adhesive substrate. Each protective layer 40, 50 is configured to be sandwiched between successive overlapping windings of the main layers 47, 57 of the respective multi-layer tapes 46, 56 wound on the respective spools 45, 55. As a result, these successive windings are prevented from sticking together by the adhesive substrate.

[0104] Each protective layer 40, 50 is made of a material that can be easily removed while adhering to the adhesive substrate and leaving the adhesive on its respective main substrate. Each protective layer 40, 50 is configured to be removable from its respective main layer 47, 57 without peeling the adhesive from the adhesive substrate. The protective layers 40, 50 are made of, for example, silicon-treated paper. The main layer 47 and the protective layer 40 overlapped thereon form the multi-layer tape 46 and are wound together on the spool 45. The main layer 57 and the protective layer 50 overlapped thereon form the multi-layer tape 56 and are wound together on the spool 55.

[0105] The apparatus 100 includes a first spool support 101 configured to support the spools 45 and 55 in a replaceable manner and a second spool support 102.

[0106] In the first operating configuration of the apparatus 100 shown in FIGS. 1 to 3, the second spool support 102 supports the spool 45 in use, and its multi-layer tape 46 in use is fed out to supply its main layer 47 to the production line 200. In this operating configuration, the first spool support 101 is available for receiving the unused spool 55 so that the unused spool 55 can immediately replace the spool 45 in use when the spool 45 in use is exhausted.

[0107] In the second operating configuration of the apparatus 100 shown in FIGS. 9 and 10, the first spool support 101 supports the spool 45 in use while the main layer 47 of the multi-layer tape 46 in use is supplied to the production line 200. In the second configuration, the second spool support 102 is available for receiving the unused spool 55 so that the unused spool 55 can immediately replace the spool 45 in use when the spool 45 in use is exhausted.

[0108] In this way, the unused multi-layer tape 56 of the unused spool 55 can be quickly replaced with the multi-layer tape 46 in use after the multi-layer tape 46 in use is exhausted.

[0109] The apparatus 100 includes a joining station 105 schematically shown in FIG. 1, where the unused multi-layer tape 56 is joined to the multi-layer tape 46 in use.

[0110] The bonding station 105 includes a first holding device 110. The first holding device 110 is configured to hold the head free end 58 of the unused multi-layer tape 56 that is partially unwound from the unused spool 55 (Fig. 4). The head free end 58 of the unused multi-layer tape 56 can be manually positioned on the first holding device 110 by an operator. The first holding device 110 is preferably pneumatic and is configured to hold the head free end 58 by suction. In the first configuration of the device 100, the first holding device 110 is configured to hold the head free end 58 of the unused multi-layer tape 56. The head free end 58 of the unused multi-layer tape 56 is arranged on the first holding device 110 with the main layer 57 in contact with the first holding device 110 and the protective layer 50 facing away from the first holding device 110.

[0111] The bonding station 105 further includes a knife 112. The knife 112 is configured to cut the multi-layer tape 46 in use to obtain the tail free end 48. In the first and second operating configurations of the device 100, when the spool 45 in use is running out, the multi-layer tape 46 in use is stopped and held in a taut state, and the knife 112 cuts cleanly across the multi-layer tape 46 in use. The cut portion 49 of the multi-layer tape 46 that remains partially wound on the spool 45 in use is discarded.

[0112] The joining station 105 further includes a second holding device 114. The second holding device 114 is configured to hold the free tail end 48 of the multilayer tape 46 in use. The second holding device 114 is adjacent to the first holding device 110. The second holding device 114 is configured to hold the free tail end 48 of the multilayer tape 46 in use that has been cut by the knife 112. The second holding device 114 is preferably pneumatic and is configured to hold the free tail end 48 by suction. The first holding device 110 and the second holding device 114 have a common lying plane. In the first and second operating configurations, the first holding device 110 and the second holding device 114 hold the multilayer tape 46 in use while the multilayer tape 46 in use is being cut by the knife 112, and then the second holding device 114 holds the free tail end 48 of the multilayer tape 46 in use. After cutting, the free tail end 48 of the multilayer tape 46 in use is placed on the second holding device 114 with the protective layer 40 and the main layer 47 arranged as the unused multilayer tape 56. The main layer 47 is arranged in contact with the second holding device 114, and the protective layer 40 faces away from the second holding device 114.

[0113] The joining station 105 further includes a first applicator 116. The first applicator 116 holds the first connecting element 60 and is configured to apply the first connecting element 60 onto the protective layer 50 of the unused multilayer tape 56 and the protective layer 40 of the multilayer tape 46 in use at the head free end 58 and the tail free end 48. The first connecting element 60 includes an adhesive sheet 61 having an adhesive surface and a non - adhesive surface. The first applicator 116 is arranged on the opposite side of the first holding device 110 and the second holding device 114 with respect to the forward path P.

[0114] The first applicator 116 is configured to hold the first connection element 60 by suction from the non-adhesive side. The first applicator 116 is movable between a stationary position distal to the first holding device 110 and the second holding device 114 and an application position proximal to and facing the first holding device 110 and the second holding device 114. At each application position, the first applicator 116 is configured to press the adhesive surface of the first connection element 60 against the first holding device 110 and the second holding device 114.

[0115] In a first configuration of the device 100, the first connection element 60 is, in the stationary position, placed on the first applicator 116, preferably manually by an operator. After the knife 112 cuts the multi-layer tape 46 in use, the tail free end 48 of the multi-layer tape 46 in use is held by the second holding device 114, and the head free end 58 of the unused multi-layer tape 56 is held by the first holding device 110, one adjacent to the other and in a common lying plane. The first applicator 116 moves from the stationary position towards the first holding device 110 and the second holding device 114 to the application position. At the application position, the adhesive surface of the first connection element 60 contacts and adheres to both the head free end 58 and the tail free end 48. The first holding device 110 and the second holding device 114 hold the tail free end 48 of the multi-layer tape 46 in use and the head free end 58 of the unused multi-layer tape 56 from the opposite side of the first applicator 116 during the application of the first connection element 60. The first applicator 116 is then returned to the stationary position.

[0116] In the second configuration of the device 100, the first connecting element 60 is preferably manually pre-applied by an operator to the head free end 58 of the unused multilayer tape 56 partially unwound from the unused spool 55 so as to project from the head free end 58. Both the first connecting element 60 and the head free end 58 are already joined on the first applicator 116 in the stationary position and are preferably manually arranged by an operator. After the knife 112 cuts the multilayer tape 46 in use, the tail free end 48 of the multilayer tape 46 in use is held by the second holding device 114. The first applicator 116 moves from the stationary position to the application position towards the first holding device 110 and the second holding device 114. In the application position, the adhesive surface of the first connecting element 60 protruding from the head free end 58 of the unused multilayer tape 56 contacts and adheres to the tail free end 48 of the multilayer tape 46 in use. Then, the first applicator 116 is returned to the stationary position. The first connecting element 60 is applied onto the protective layer 50 of the unused multilayer tape 56 and the protective layer 40 of the multilayer tape 46 in use to join the protective layers 50, 40 of the unused multilayer tape 56 and the multilayer tape 46 in use. In this way, the multilayer tape 46 in use and the unused multilayer tape 56 are joined via their respective protective layers 40, 50.

[0117] The joining station 105 further comprises a second applicator 118. The second applicator 118 holds the second connecting element 70 and is configured to apply the second connecting element 70 onto the main layer 57 of the unused multilayer tape 56 and the main layer 47 of the multilayer tape 46 in use at the head free end 58 and the tail free end 48. The second applicator 118 is arranged downstream of the first applicator 116 along the forward path P. The second applicator 118 is further arranged on the opposite side of the first applicator 116 with respect to the forward path P.

[0118] The second connecting element 70 includes one or more adhesive sheets 71 having an adhesive surface and a non-adhesive surface. The second applicator 118 is similar to the first applicator 116. The second applicator 118 is configured to hold the second connecting element 70 by suction from the side of the non-adhesive surface.

[0119] The joining station 105 also includes a contact element 120. The contact element 120 is disposed on the opposite side of the second applicator 118 with respect to the forward path P. The second applicator 118 is movable between a stationary position distal to the contact element 120 and an application position proximal to and facing the contact element 120. At each application position, the second applicator 118 is configured to press the adhesive surface of the second connecting element 70 against the contact element 120.

[0120] The joining station 105 also includes a sensor 122. The sensor 122 is disposed along the forward path P between the first applicator 116 and the second applicator 118. The sensor 122 is disposed downstream of the first applicator 116 and upstream of the second applicator 118 with respect to the forward path P. The sensor 122 is configured to detect the first connecting element 60. Preferably, the sensor 122 is optical, for example a photocell, and faces the forward path P.

[0121] In both the first configuration and the second configuration of the device 100, the second connecting element 70 is, in the stationary position, placed manually by an operator, preferably on the second applicator 118.

[0122] The second connecting element 70 is affixed onto the second applicator 118 such that it does not overlap the first connecting element 60 when affixed. For example, as shown in FIG. 9, the first connecting element 60 can comprise a single adhesive sheet 61 positioned on the first applicator 116 such that it is affixed to the central portion of the head free end 58 and the tail free end 48, and the second connecting element 70 can comprise two adhesive sheets 71 positioned on the second applicator 118 such that they are affixed on both sides of the first connecting element 60 at the opposing side portions of the head free end 58 and the tail free end 48, and vice versa. In a further example not shown, the first connecting element 60 can comprise a single adhesive sheet positioned on the first applicator 116 such that it is affixed at one side portion of the head free end 58 and the tail free end 48, and the second connecting element 70 can comprise a single sheet positioned on the second applicator 118 such that it is affixed at the side portion on the opposite side of the head free end 58 and the tail free end 48.

[0123] The second applicator 118 is controlled by a signal received by the sensor 122 to apply a second connecting element 70 on the head free end 58 and the tail free end 48 at the first connecting element 60. After the first applicator 116 applies the first connecting element 60, the used multilayer tape 46 and the unused multilayer tape 56 can proceed along the forward path P joined only by the first connecting element at their respective head free ends 58 and tail free ends 48. The second connecting element 70 is applied subsequent to the first connecting element 60 while the head free end 58 and the tail free end 48 are moving along the forward path P. The sensor 122 detects the first connecting element 60 and controls the movement of the second applicator 118 from the rest position to the application position. The movement of the second applicator from the time the sensor 122 detects the first connecting element 60 is substantially instantaneous or delayed by a preset time so that the second connecting element 70 is applied at the first connecting element 60. At the application position, the adhesive surface of the second connecting element 70 contacts and adheres to both the head free end 58 and the tail free end 48. The abutting element 120 holds the tail free end 48 of the used multilayer tape 46 and the head free end 58 of the unused multilayer tape 56 on the opposite side of the second applicator 118 during the application of the first connecting element 60. Then, the second applicator 118 is returned to the rest position.

[0124] The second connecting element 70 is applied on the main layer 57 of the unused multilayer tape 56 and the main layer 47 of the used multilayer tape 46 to join the main layers 57, 47 of the unused multilayer tape 56 and the used multilayer tape 46. In this way, the second connecting element 70 joins the multilayer unused tape 56 to the used multilayer tape 46 on the opposite side of the first connecting element 60 and through the respective main layers 57, 47.

[0125] The separation station 130 shown in FIGS. 1 and 7 is arranged downstream of the joining station 105 along the forward path P. At the separation station 130, the protective layer 40 is separated from the main layer 47.

[0126] The first pulling member 150 is disposed at the separation station 130. The first pulling member 150 is configured to move the protective layer 40 of the multi-layer tape 46 in use and the protective layer 50 of the unused multi-layer tape 56 in the first direction D1. In the accompanying drawings, the first pulling member 150 is schematically represented as a roller.

[0127] The second pulling member 155 is disposed at the separation station 130. The second pulling member 155 is configured to move the main layer 47 of the multi-layer tape 46 in use and the main layer 57 of the unused multi-layer tape 56 in the second direction D2. The second direction D2 branches off from the first direction D1. In the accompanying drawings, the second pulling member 155 is schematically represented as a roller.

[0128] After the first connecting element 60 and the second connecting element 70 are attached, the first pulling member 150 and the second pulling member 155 move the protective layer 40 and the main layer 47 of the multi-layer tape 46 in use in the first direction D1 and the second direction D2, respectively. The tail free end 48 of the multi-layer tape 46 in use, the first connecting element 60, the second connecting element 70, and the head free end 58 of the multi-layer tape 46 in use are pulled along the forward path P towards the separation station 130.

[0129] When the tail free end 48 of the multi-layer tape 46 in use arrives at the separation station 130, the first connecting element 60 is pulled in the first direction D1 by the protective layer 40 of the multi-layer tape 46 in use. Next, the first connecting element 60 pulls the protective layer 50 of the unused multi-layer tape 56 in the first direction D1. At the same time, the second connecting element 70 is pulled in the second direction D2 by the main layer 47 of the multi-layer tape 46 in use. Next, the second connecting element 70 pulls the main layer 57 of the unused multi-layer tape 56 in the second direction D2.

[0130] In the illustrated embodiment, the protective layers 40 of the multilayer tape 46 in use and the protective layers 50 of the unused multilayer tape 56 are conveyed to the processing device 140 after separation of the main layers 47 and 57. The main layer 47 of the multilayer tape 46 in use and the main layer 57 of the unused multilayer tape 56 are conveyed to the production line 200 after separation of the protective layers 40 and 50.

[0131] In the processing device 140, the protective layers are discarded and, for example, destroyed.

[0132] The main layer 57 of the unused multilayer tape 56 is supplied to the production line 200. Thus, the unused multilayer tape 56 becomes the multilayer tape 46 in use, and the unused spool 55 from which the unused multilayer tape 56 is unwound becomes the spool 45 in use. When such spools are running out, the above-described method may be repeated. This method is repeated by alternately performing the first operating configuration and the second operating configuration of the above-described device 100 for each repetition.

[0133] Obviously, those skilled in the art can make many modifications and changes to the above-described invention while staying within the scope of protection defined by the following claims to meet specific and indefinite needs.

Claims

Claim 1 A method for supplying a layer of an unused multi-layer tape (56) to a production line (200) of an absorbent hygiene article (10), comprising: providing a head free end (58) of the unused multi-layer tape (56) partially unwound from each unused spool (55); providing a tail free end (48) of the multi-layer tape (46) in use; at the head free end (58) and the tail free end (48), applying a first connecting element (60) onto a first layer (50) of the unused multi-layer tape (56) and a first layer (40) of the multi-layer tape (46) in use by a first applicator (116); at the head free end (58) and the tail free end (48), applying a second connecting element (70) onto a second layer (57) of the unused multi-layer tape (56) and a second layer (47) of the multi-layer tape (46) in use by a second applicator (118); pulling the first layer (50) of the unused multi-layer tape (56) in a first direction (D1) by advancing the first layer (40) of the multi-layer tape (46) in use and the first connecting element (60) in the first direction (D1); pulling the second layer (57) of the unused multi-layer tape (56) in a second direction (D2) branched from the first direction (D1) by advancing the second layer (47) of the multi-layer tape (46) in use and the second connecting element (70) in the second direction (D2). A method as described above. Claim 2 The layer supplied to the production line (200) is the second layer (57) of the unused multi-layer tape (56). Each of the second layer (57) of the unused multi-layer tape (56) and the second layer (47) of the multi-layer tape (46) in use comprises a main layer with an adhesive substrate. Each of the first layer (50) of the unused multi-layer tape (56) and the first layer (40) of the multi-layer tape (46) in use comprises a removable protective layer covering the adhesive substrate of the main layer. The method according to Claim 1. Claim 3 The step of applying the second connecting element (70) is performed after the step of applying the first connecting element (60). The method according to Claim 1. Claim 4 including the step of moving the free end of the head (58) and the free end of the tail (48) after attaching the first connecting element (60) and before attaching the second connecting element (70); The method according to claim 3, wherein the second connecting element (70) is attached while the free end of the head (58) and the free end of the tail (48) are moving along the supply path (P).

5. The step of attaching the second connecting element (70) includes the step of detecting the already attached first connecting element (60) by a sensor (122); The method according to claim 3, wherein the step of attaching the second connecting element (70) is performed when the sensor (122) detects the first connecting element (60).

6. The method according to claim 1, wherein the first connecting element (60) and the second connecting element (70) do not overlap each other when attached.

7. The step of attaching the first connecting element (60) includes arranging the free end of the head (58) of the unused multi-layer tape (56) at a position adjacent to the free end of the tail (48) of the multi-layer tape (46) in use without overlapping the free end of the head (58) with the free end of the tail (48). The method according to claim 1.

8. An apparatus (100) for supplying a layer of an unused multi-layer tape (56) to a production line (200) of an absorbent hygiene product (10), a first holding device (110) configured to hold the free end of the head (58) of the unused multi-layer tape (56) partially unwound from each unused spool (55); a second holding device (114) configured to hold the free end of the tail (48) of the multi-layer tape (46) in use; a first applicator (116) configured to attach a first connecting element (60) on the first layer (50) of the unused multi-layer tape (56) and the first layer (40) of the multi-layer tape (46) in use at the free end of the head (58) and the free end of the tail (48); a second applicator (118) configured to attach a second connecting element (70) on the second layer (57) of the unused multi-layer tape (56) and the second layer (47) of the multi-layer tape (46) in use at the free end of the head (58) and the free end of the tail (48); A first pulling member (150) configured to pull the first layer (50) of the unused multilayer tape (56) in a first direction (D1) by advancing the first layer (40) of the multilayer tape (46) in use and the first connecting element (60) in the first direction (D1); A second pulling member (155) configured to pull the second layer (57) of the unused multilayer tape (56) in a second direction (D2) by advancing the second layer (47) of the multilayer tape (46) in use and the second connecting element (70) in the second direction (D2); The apparatus (100) comprising the same. **Claim 9** The apparatus (100) according to claim 8, wherein the second applicator (118) is disposed downstream of the first applicator (116) along the advancing path (P) of the multilayer tape (46) in use and the unused multilayer tape (56), and is configured to attach the second connecting element (70) following the first connecting element (60). **Claim 10** The apparatus (100) according to claim 9, wherein the second applicator (118) is configured to attach the second connecting element (70) while the head free end (58) and the tail free end (48) are moving along the advancing path (P). **Claim 11** The apparatus (100) according to claim 9, comprising a sensor (122) configured to detect the first connecting element (60) attached on the first layer (50) of the unused multilayer tape (56) and the first layer (40) of the multilayer tape (46) in use at the head free end (58) and the tail free end (48), and the second applicator (118) is configured to attach the second connecting element (70) when the sensor (122) detects the first connecting element (60).

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