A double-sided adhesive tape laminating and die-cutting machine and production method thereof

Abstract

The application discloses a baseless double-sided adhesive tape attaching and die-cutting machine and a production method, which comprises a rack and sequentially arranged unwinding units, film tearing units, attaching units, upper film units and cutting units. The unwinding units provide double-sided adhesive tapes containing at least a first release layer, an adhesive layer and a bearing layer. The film tearing units strip the first release layer to expose the adhesive layer. The attaching units attach strip-shaped patches to the surface of the adhesive layer along the length direction of the adhesive tape to form an intermediate composite tape. The upper film units cover the second release film on the side of the strip-shaped patch to form a composite tape to be cut. The cutting units cut the composite tape along the position corresponding to the strip-shaped patch, so that part of the strip-shaped patch is reserved at the cut edge of each sheet-shaped double-sided adhesive tape. In the application, the strip-shaped patch is reserved at the edge of the adhesive layer as a gripping part, which can be directly pinched and peeled off when in use, so that the adhesive layer is prevented from being lifted, the technical problem of difficult peeling of the baseless double-sided adhesive tape is solved, and full-process automatic production is realized.

Description

Technical Field

[0001] This invention relates to double-sided adhesive production equipment and methods, and in particular to a substrate-free double-sided adhesive bonding and die-cutting machine and production method. Background Technology

[0002] Substrate-free double-sided tape (also known as carrier-free double-sided tape) is a composite tape product consisting only of an adhesive layer and a release material. Because it does not contain substrates such as PET or non-woven fabric, it has excellent thinness, high transparency, excellent weather resistance and adhesion. It is widely used in precision electronic fields such as optical films, touch screens, flexible circuit boards, and electronic component assembly. As consumer electronics products develop towards lightweight, thin, and narrow bezel designs, increasingly higher requirements are being placed on the dimensional accuracy, cutting quality and mounting efficiency of substrate-free double-sided tape.

[0003] Currently, the die-cutting process for substrate-free double-sided tape typically involves multiple steps, such as unwinding and punching, from the roll of double-sided adhesive material to form a sheet-like double-sided adhesive product that can be directly applied by end customers.

[0004] For the obtained sheet-like double-sided tape products, since the adhesive layer of the substrate-free double-sided tape does not have a substrate support, the adhesive itself has great extensibility and flexibility. In actual use, the operator needs to peel the release layer from the surface of the adhesive layer. However, since the adhesive layer and the release layer are completely attached at the edge and there is no protruding structure for gripping, it is difficult to find a suitable point of force when peeling. It is often necessary to use auxiliary tools such as tweezers or repeatedly rub the edge of the release film with fingers, which is extremely inconvenient.

[0005] Furthermore, the adhesive layer and the release layer are flush with each other at the cut edge, or the release layer is even slightly recessed. Since the adhesive layer of the substrate-free double-sided adhesive is directly coated on the release paper, there is a certain peel resistance between the adhesive and the release paper. When the user tears the release layer from the edge, if the peel force of the release layer does not match the cohesive force of the adhesive layer, the tearing force will be transmitted along the edge of the adhesive layer, causing the edge of the adhesive layer to be stretched and deformed or even torn off. This results in the edge of the adhesive layer warping, curling, or partial detachment. The adhesive layer that is pulled off cannot be used and may also contaminate the surface of the object being bonded, seriously affecting the final bonding quality and product yield.

[0006] Therefore, how to ensure that the effective bonding area of ​​the substrate-free double-sided tape is not affected, while making the edges of the cut sheet double-sided tape have a structure that is easy to grasp and peel off, so as to avoid the adhesive layer being pulled up when tearing off the release layer, and at the same time realize the fully automated continuous production from raw material unwinding to finished product cutting, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] Therefore, it is necessary to provide a substrate-free double-sided adhesive bonding and die-cutting machine and production method to address the problems in the existing technology.

[0008] A substrate-free double-sided adhesive bonding and die-cutting machine, comprising: The machine frame, and the unwinding unit, film-tearing unit, laminating unit, overlaying unit, and cutting unit arranged sequentially along the process direction on the machine frame. The unwinding unit includes a tape unwinding shaft for holding rolls of double-sided adhesive tape. The double-sided adhesive tape includes at least a first release layer, an adhesive layer, and a carrier layer stacked sequentially. The film-peeling unit is located downstream of the unwinding unit and peels off the first release layer of the double-sided tape to expose the surface of the adhesive layer. The attaching unit is located downstream of the film-peeling unit. It transfers and attaches strip-shaped patches at intervals along the length of the double-sided adhesive tape to the exposed surface of the adhesive layer, forming an intermediate composite tape. The upper film unit is located downstream of the attachment unit, and a second release film is applied to the side of the intermediate composite strip where the strip patch is attached, forming a composite strip to be cut. The cutting unit is located downstream of the upper coating unit and cuts the composite strip to be cut along the position corresponding to the strip patch to form multiple independent sheet double-sided adhesives, and each sheet double-sided adhesive retains a portion of the strip patch at at least one cut edge.

[0009] By automating the entire process of unwinding, tearing, attaching, laminating, and cutting, and retaining strip patches at the cutting edge as gripping parts, the problem of difficult peeling of substrate-free double-sided adhesive due to lack of substrate support and easy removal of adhesive layer when peeling off the release layer is solved, thus achieving efficient and continuous production.

[0010] In one embodiment, the attachment unit includes a peeling plate having a peeling side. A backing film with strip-shaped patches is conveyed to the peeling plate and its movement is redirected along the peeling side. The strip-shaped patches and the backing film gradually separate at the peeling side. By redirecting the backing film via the peeling side of the peeling plate, the automatic separation of the strip-shaped patches from the backing film is achieved by utilizing the characteristic that the strip-shaped patches cannot be redirected. This design is simple, reliable, and avoids wrinkling or stretching deformation of the strip-shaped patches.

[0011] In one embodiment, the attaching unit further includes an attaching roller disposed outside the peeling plate, with a gap between the attaching roller and the peeling side of the peeling plate for the backing film and the carrier layer to pass through. After the double-sided adhesive tape, having been peeled off by the film-tearing unit, passes through the gap and wraps around the outer surface of the attaching roller. The strip-shaped patch, separated from the backing film at the peeling side, moves to the attaching roller under the influence of the backing film and is attached to the adhesive layer surface of the double-sided adhesive tape that has wrapped around the attaching roller. Through the gap fit between the peeling plate and the attaching roller, the peeled strip-shaped patch is precisely joined and pressed against the adhesive layer at the attaching roller, achieving a smooth transfer of the strip-shaped patch from the backing film to the adhesive layer, ensuring accurate attachment position and no air bubbles.

[0012] In one embodiment, the bonding unit further includes a pressing assembly and a slitting assembly. The pressing assembly includes an upper pressing roller and a lower pressing roller arranged opposite each other and pressing against each other. The patch film to be bonded and the backing film pass between the upper and lower pressing rollers and are pressed together to form a composite film strip. The slitting assembly is located downstream of the pressing assembly and includes a lower slitting roller and an upper circular blade arranged opposite each other. The composite film strip passes between the lower slitting roller and the upper circular blade. The upper circular blade cuts only the patch film along the width direction of the composite film strip to form strips of patch film arranged at intervals on the backing film. By bonding the patch film and the backing film together with the pressing assembly and then cutting only the patch film with the upper circular blade, online continuous production of strip patches can be achieved without the need for pre-preparation of special film strips, and the size and spacing of the strip patches can be flexibly adjusted.

[0013] In one embodiment, the attaching unit further includes a bottom film take-up roller. After the strip patch separates from the bottom film, the separated bottom film is turned and moved to the bottom film take-up roller by the action of the peeling plate, and collected into a roll. The bottom film take-up roller automatically rolls up and collects the separated empty bottom film, avoiding waste film scattering that could cause equipment entanglement or environmental pollution, and ensuring a clean production site.

[0014] In one embodiment, the film-tearing unit includes a separation shaft and a first release film winding shaft. The double-sided adhesive tape is led out from the tape unwinding shaft and reverses around the separation shaft. The first release layer and the adhesive layer separate at the separation shaft. The separated first release layer is wound up by the first release film winding shaft. After being processed by the film-tearing unit, the adhesive layer of the double-sided adhesive tape faces upward, and the carrier layer and the adhesive layer move together to the application unit. The separation shaft causes the double-sided adhesive tape to turn, enabling automatic peeling of the first release layer, which is then synchronously wound up by the first release film winding shaft. This ensures a continuous and stable film-tearing process, and the adhesive layer facing upward facilitates subsequent application operations.

[0015] In one embodiment, the upper coating unit is located downstream of the bonding unit and includes an upper coating roller and a lower coating roller that are positioned opposite each other and press against each other, as well as a second release film feeding shaft positioned above the upper coating roller. A roll of second release film is sleeved on the second release film feeding shaft. The second release film, together with the intermediate composite belt from the bonding unit, passes between the upper and lower coating rollers. As it passes through, the second release film presses against one side of the strip patch on the intermediate composite belt. By pressing the second release film against the strip patch side using the upper and lower coating rollers, the adhesive layer and the strip patch are fully protected, preventing adhesive adhesion or contamination in subsequent processes, while also providing a release carrier for the finished product.

[0016] In one embodiment, the cutting unit includes a cutting platform disposed downstream of the upper laminating unit along the process direction. A traction roller group and a cutting assembly are disposed on the upper side of the cutting platform along the process direction. The traction roller group includes several traction rollers pressed against the upper side of the cutting platform. The composite tape to be cut passes between the traction rollers and the cutting platform. The cutting assembly is disposed downstream of the traction roller group and includes a cutter spanning above the cutting platform and a drive unit for driving the cutter to move up and down. The cutter moves downward under the drive unit, cutting the composite tape to be cut at the position corresponding to the strip patch, forming independent sheet double-sided adhesive. A receiving frame is disposed below the cutting platform, and the cut sheet double-sided adhesive falls into the receiving frame through the end of the cutting platform. Precise step feeding by the traction roller group and fixed-distance cutting by the cutter at the corresponding strip patch position ensure that each sheet double-sided adhesive retains a gripping part at its edge. The receiving frame below the cutting platform enables automatic collection of finished products.

[0017] A method for producing substrate-free double-sided adhesive, including A double-sided tape is provided, the double-sided tape comprising at least a first release layer, an adhesive layer and a carrier layer stacked sequentially; Peel off the first release layer to expose the surface of the adhesive layer; Multiple strip patches are attached at intervals along the length of the exposed surface of the adhesive layer to obtain an intermediate composite strip; A second release layer is applied to the strip patch side of the intermediate composite strip to form the composite strip to be cut. The composite tape to be cut is cut along the cutting line corresponding to the position of the strip patch to obtain multiple independent sheet-like double-sided adhesives; The cutting line is located in the middle region of the strip patch, so that each sheet of double-sided adhesive contains a residual portion of the strip patch on both opposite cut edges.

[0018] This product offers a complete production process from double-sided tape to finished sheet double-sided tape. By placing the cutting line in the middle of the strip patch, each sheet double-sided tape retains a strip patch residue on both opposite cut edges, allowing the product to be pinched and peeled off from both ends, thus improving ease of use.

[0019] In one embodiment, a plurality of strip patches are attached at intervals along the length direction to the exposed surface of the adhesive layer to obtain an intermediate composite strip comprising: The patch film and the backing film are pressed together to form a composite film strip, wherein the patch film is adhered to one side surface of the backing film. Along the length of the composite film strip, only the patch film is cut to form multiple strip-shaped patches arranged along its length on the backing film. Each strip patch still moves synchronously with the backing film. A peeling plate is installed so that the backing film is turned and moved forward. At the peeling plate, the strip patch gradually separates from the backing film. The adhesive layer and the carrier layer of the first release layer are continuously moved along the direction of travel on the outside of the release plate. The support film and its strip patches are controlled to move intermittently in a stepping manner, so that the strip patches separated at the release plate are sequentially transferred to the outside of the adhesive layer of the carrier layer and attached to each other at intervals in the direction of travel of the carrier layer. In this process, by adjusting the travel speed of the carrier layer and the stepping stroke of the backing film, the strip patches attached to the adhesive layer maintain a preset spacing.

[0020] By controlling the base film to move intermittently in a stepping manner, while the adhesive layer and the carrier layer move continuously, the bonding spacing of the strip patch can be flexibly changed by adjusting the speed matching relationship between the two, so as to adapt to the rapid changeover production of products with different specifications.

[0021] The aforementioned substrate-free double-sided tape laminating and die-cutting machine and production method, by sequentially setting up an unwinding unit, a film-tearing unit, an attaching unit, an overlaying unit, and a cutting unit along the process direction, constructs a fully automated processing production line from unwinding the double-sided tape raw material to cutting the finished sheet double-sided tape. The units are continuously connected and cooperate with each other without the need for manual transfer intervention, which significantly improves the production efficiency and product consistency of substrate-free double-sided tape and reduces the risk of contamination and damage to the adhesive surface caused by manual operation.

[0022] The attaching unit attaches strip-shaped patches at intervals along the length of the double-sided tape to the exposed surface of the adhesive layer. The cutting unit cuts the composite tape to be cut along the position corresponding to the strip-shaped patch, and at least one cut edge of each sheet double-sided tape retains a portion of the strip-shaped patch. In use, the operator or automated mounting equipment can directly pinch the second release film portion corresponding to the strip-shaped patch to peel the second release layer from the surface of the adhesive layer. The tearing force is applied to the strip-shaped patch rather than directly to the edge of the adhesive layer, effectively avoiding the problem of the adhesive layer being pulled up due to direct pulling of the release layer. This fundamentally solves the technical problem of substrate-free double-sided tape being difficult to peel off and use due to the lack of substrate support and easily pulling up the adhesive layer. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the substrate-free double-sided adhesive bonding and die-cutting machine of the present invention. Figure 2 This is a schematic cross-sectional view of the bonding and die-cutting machine for the substrate-free double-sided adhesive of the present invention. Among them, 1. rack; 2. Unwinding unit; 21. Tape unwinding shaft; 3. Film tearing unit; 31. Separation shaft; 32. First release film winding shaft; 4. Attaching unit; 41. Peeling plate; 42. Attaching roller; 43. Pressing assembly; 431. Upper pressure roller; 432. Lower pressure roller; 44. Slitting assembly; 441. Lower slitting roller; 442. Upper circular knife; 45. Bottom film take-up roller; 5. Upper film coating unit; 51. Upper film coating roller; 52. Lower film coating roller; 53. Second release film feeding shaft; 6. Cutting unit; 61. Cutting platform; 62. Traction roller group; 63. Cutting blade assembly. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] like Figure 1 and Figure 2 As shown, a substrate-free double-sided adhesive bonding and die-cutting machine includes: The frame 1, and the unwinding unit 2, the film peeling unit 3, the laminating unit, the top laminating unit 5, and the cutting unit 6 arranged sequentially along the process direction on the frame 1. The unwinding unit 2 includes a tape unwinding shaft 21 for holding rolls of double-sided adhesive tape. The double-sided adhesive tape includes at least a first release layer, an adhesive layer, and a carrier layer stacked sequentially. The film-peeling unit 3 is located downstream of the unwinding unit 2 and peels off the first release layer of the double-sided tape to expose the surface of the adhesive layer. The attaching unit 4 is located downstream of the film-peeling unit 3. It transfers the strip-shaped patches at intervals along the length of the double-sided adhesive tape and attaches them to the exposed surface of the adhesive layer to form an intermediate composite tape. The upper film unit 5 is located downstream of the attachment unit 4, and covers the side of the intermediate composite strip where the strip patch is attached with a second release film to form the composite strip to be cut. The cutting unit is located downstream of the upper film unit 5 and cuts the composite strip to be cut along the position corresponding to the strip patch to form multiple independent sheet double-sided adhesives, and each sheet double-sided adhesive retains a portion of the strip patch at at least one cut edge.

[0028] By sequentially setting up unwinding unit 2, film peeling unit, pasting unit 4, overlaying unit 5 and cutting unit 6 along the process direction, a fully automated processing production line is constructed from unwinding of double-sided tape raw materials to cutting and unloading of finished sheet double-sided tape. The units are continuously connected and cooperate with each other without the need for manual transfer intervention, which significantly improves the production efficiency and product consistency of substrate-free double-sided tape and reduces the risk of contamination and damage to the adhesive surface caused by manual operation.

[0029] At this time, the unwinding unit 2 is located at the upstream end of the entire production line. Its core component is the tape unwinding shaft 21. The unwinding shaft is rotatably mounted on the starting end of the frame 1 through a bearing seat. It is used to load and carry the roll of double-sided tape material. One end of the unwinding shaft is connected to a magnetic powder brake or servo motor to control the unwinding tension, so that the double-sided tape is pulled out with a constant tension. The film-peeling unit is located downstream of the unwinding unit 2. It is used to peel the outermost first release layer of the double-sided tape from the adhesive layer surface. After the double-sided tape is led out from the unwinding shaft, it enters the film-peeling unit 3. Here, the first release layer is separated and wound up, thereby completely exposing the originally covered adhesive layer surface, preparing for the subsequent application of strip patches.

[0030] The attachment unit is located downstream of the film-peeling unit 3. The double-sided tape after the film-peeling process (which at this time only contains the adhesive layer and the carrier layer) enters the attachment unit 4. At the same time, the pre-prepared strip patches are also fed into the attachment unit 4. In the attachment unit 4, the strip patches are transferred and attached to the surface of the adhesive layer in sequence. Multiple strip patches are arranged at certain preset intervals along the length of the double-sided tape to form an intermediate composite strip. The structure of the intermediate composite strip from top to bottom consists of multiple spaced strip patches, a continuous adhesive layer, and a continuous carrier layer.

[0031] The upper coating unit 5 is located downstream of the attachment unit 4. The intermediate composite tape enters the upper coating unit 5 after being output from the attachment unit 4. Here, a continuous second release film covers one side of the strip patch of the intermediate composite tape from above. The second release film fully covers the exposed surfaces of the strip patch and the adhesive layer, forming a composite tape to be cut. The structure of the composite tape to be cut, from top to bottom, consists of the second release film, multiple spaced strip patches, a continuous adhesive layer, and a continuous carrier layer.

[0032] The cutting unit 6 is located downstream of the upper coating unit 5 and is the final processing station of the entire production line. When the composite tape to be cut passes through the cutting unit 6, the cutting unit 6 cuts the composite tape to be cut at a fixed distance. The cutting position is not arbitrary, but precisely corresponds to the position of the strip patch. Specifically, the cutting line is located in the middle area of ​​the width direction of the strip patch (i.e., the cutter cuts from the middle position of the strip patch). Since the strip patch itself has a certain width, when the cutter cuts from the middle position, one side (upstream side) and the other side (downstream side) of the cutter retain half of the strip patch respectively. Thus, each cutting operation will simultaneously form two independent sheet double-sided adhesives. The rear edge of the upstream sheet double-sided adhesive retains the rear half of the strip patch, and the front edge of the downstream sheet double-sided adhesive retains the front half of the strip patch. For each finally formed independent sheet double-sided adhesive, at least one cutting edge (i.e. the edge formed by the cutter) retains part of the strip patch.

[0033] With the above solution, the independent sheet-like double-sided adhesive formed after cutting retains a portion of the strip patch at its edge. The strip patch is located at the edge of the adhesive layer and is not adhesive. In this way, the strip patch can also form a gripping part when peeling off the second release film. In use, the operator or automated mounting equipment can directly pinch the gripping part to peel the second release film from the surface of the adhesive layer. The tearing force is applied to the strip patch rather than directly to the edge of the adhesive layer, effectively avoiding the problem of the adhesive layer being pulled up along with it due to directly pulling the release layer.

[0034] In the attachment unit 4, how to accurately and stably peel the strip patch from the backing film and transfer it to the adhesive layer surface is a key factor affecting the attachment accuracy and product quality. In this embodiment, the attachment unit 4 includes a peeling plate 41 with a peeling side. The backing film with the strip patch is conveyed to the peeling plate 41 and the backing film is turned and moved through the peeling side. The strip patch and the backing film are gradually separated at the peeling side position. At this time, the strip patch is made of PET material, which has a certain rigidity and thickness. In order to facilitate the movement of the strip patch, a support film is attached to its lower side, that is, several strip patches are located on the upper side of the support film. In this way, the support film can support the movement of the strip patch. The peeling plate 41 is a thin metal plate (preferably made of stainless steel) and is fixedly installed on the frame 1. The peeling plate 41 has a peeling side, which is the edge of the peeling plate 41 facing the application roller 42. It is precision machined to form a sharp right-angle edge or a rounded edge with a certain arc radius (R0.5-R2mm).

[0035] At this time, the backing film moves on the upper side of the peeling plate 41 with the strip patch. When the backing film passes the peeling side of the peeling plate 41, the backing film turns and moves forward through the peeling side. Because the backing film turns sharply, and the strip patch has a certain rigidity and thickness, it cannot follow the backing film to complete the same angle of turn. Therefore, a peeling force is generated between the strip patch and the backing film at the peeling side, causing the two to gradually separate.

[0036] In this way, by setting the peeling plate 41, the strip patch and the base film are automatically separated by the turning of the base film at the peeling side. No additional ejection or blowing device is required. The structure is simple and the separation is reliable. The strip patch is subjected to uniform force during the peeling process and is not prone to wrinkles or stretching deformation, thus ensuring the integrity and adhesion quality of the strip patch.

[0037] At this point, the peeling side is a straight edge, which makes it easy to peel the straight strip patch off from the top of the backing film.

[0038] After the strip patch is peeled off from the backing film, how to accurately transfer and attach it to the exposed surface of the adhesive layer is another key issue in the attachment process. If the strip patch is offset, flipped, or prematurely adhered to a non-target position during the transfer process, the product will be scrapped. At the same time, the adhesive layer of the double-sided tape is exposed after the film is peeled off. If it comes into unexpected contact with equipment parts during the attachment process, it may cause adhesive contamination or poor adhesion. Therefore, in this embodiment, the attachment unit 4 also includes an attachment roller 42. The attachment roller is located outside the peeling plate 41, and there is a gap between the attachment roller 42 and the peeling side of the peeling plate 41 for the backing film and the carrier layer to pass through. After the double-sided tape, after being peeled off by the film peeling unit 3, passes through the gap and wraps around to the outer surface of the attachment roller 42. The strip patch, after being separated from the backing film at the peeling side, moves to the attachment roller 42 under the drive of the backing film and is attached to the adhesive layer surface of the double-sided tape that has wrapped around the attachment roller 42.

[0039] The attaching roller 42 is a rotatable metal roller (the surface can be covered with silicone or polyurethane rubber to increase friction and adhesion uniformity). It is mounted on the frame 1 through a bearing seat. There is a gap between the attaching roller 42 and the peeling side of the peeling plate 41. The width of the gap is slightly larger than the sum of the thicknesses of the backing film and the carrier layer (usually 0.5-3mm), so that the backing film and the carrier layer can pass freely through the gap.

[0040] After the first release layer is peeled off by the film-peeling unit 3, the double-sided adhesive tape (composed of a carrier layer and an adhesive layer) enters the gap, passes through the back of the peeling plate 41 (i.e. the side opposite to the traveling side of the backing film), and travels downward around the outer surface of the attaching roller 42. The exposed surface of the adhesive layer faces outward (i.e. away from the surface of the attaching roller), and the carrier layer is in close contact with the surface of the attaching roller 42.

[0041] Meanwhile, at the peeling side of the peeling plate 41, the strip patch is separating from the backing film. As the backing film continues to move, the strip patch is driven by the backing film to move towards the attachment roller 42. When the strip patch reaches the attachment roller 42, the adhesive layer of the double-sided tape also just passes around the outer surface of the attachment roller 42 with the exposed surface facing outward. The adhesive surface of the strip patch and the exposed surface of the adhesive layer meet on the outside of the attachment roller 42. Under the support of the attachment roller 42, the two are pressed together. Specifically, the carrier layer and the adhesive layer are supported by the attachment roller 42 when they pass around the attachment roller 42, while the strip patch covers the surface of the adhesive layer under the drive of the backing film. The adhesive force between the two makes the strip patch firmly attached to the surface of the adhesive layer, completing the transfer attachment.

[0042] In this way, the coordinated arrangement of the peeling plate 41 and the application roller 42 enables a smooth and precise transfer of the strip patch from the base film to the adhesive layer. The double-sided tape wraps around the outer surface of the application roller 42, avoiding unintended contact between the adhesive layer and other equipment components, thus ensuring the cleanliness of the adhesive surface.

[0043] In this embodiment, for the lamination of strip patches and backing film, and the formation of strip patches, the bonding unit 4 further includes a lamination assembly 43 and a slitting assembly 44. The lamination assembly 43 includes an upper pressure roller 431 and a lower pressure roller 432 that are arranged opposite to each other and press against each other. The patch film to be bonded and the backing film pass through and are pressed between the upper pressure roller 431 and the lower pressure roller 432 to form a composite film strip. The slitting assembly 44 is located downstream of the lamination assembly 43 and includes a lower slitting roller 441 and an upper circular blade 442 that are arranged opposite to each other. The composite film strip passes through between the lower slitting roller 441 and the upper circular blade. The upper circular blade cuts only the patch film along the width direction of the composite film strip to form strip patches arranged at intervals on the backing film.

[0044] The pressing assembly 43 is located upstream of the bonding unit 4 (i.e., upstream of the peeling plate and the bonding roller 42), and includes an upper pressing roller 431 and a lower pressing roller 432 that are arranged opposite to each other and press against each other. Both the upper pressing roller 431 and the lower pressing roller 432 are rotatable cylindrical rollers. The gap between them is slightly smaller than the total thickness of the patch film and the backing film, so that they are squeezed when passing through. The patch film to be bonded (i.e., the raw material film strip used to make strip patches, which is a continuous PET film) is introduced from above between the upper pressing roller 431 and the lower pressing roller, and the backing film is introduced from below or the same side. Under the squeezing action of the pressing assembly 43, the patch film is pressed onto the surface of the backing film with its adhesive side facing the backing film, forming a composite film strip in which the patch film and the backing film are tightly bonded.

[0045] The slitting assembly 44 is located downstream of the pressing assembly 43 and includes a lower slitting roller 441 and an upper circular blade 442 arranged opposite to each other. The lower slitting roller 441 is a rotatable metal bottom roller with a smooth surface, providing a support platform for cutting. The upper circular blade 442 is a disc-shaped rotating cutter mounted on a blade shaft and driven by a motor to rotate at high speed. The composite film belt passes between the lower slitting roller 441 and the upper circular blade 442, and the upper circular blade 442 contacts the composite film belt from above. The gap between the upper circular blade 442 and the lower slitting roller 441 is precisely controlled so that the blade of the upper circular blade 442 just penetrates the thickness of the laminated film. Without touching the backing film, specifically, as the composite film belt travels continuously, the rotating upper circular blade 442 cuts along the width direction of the composite film belt (i.e., perpendicular to the direction of travel), cutting the patch film laterally, but the backing film remains continuous. As the composite film belt travels continuously, the upper circular blade 442 cuts at preset intervals (corresponding to the strip patch length required for the final product), thereby forming multiple strip patches arranged along the length direction on the backing film. Each strip patch still adheres to the surface of the backing film by its adhesive surface and travels synchronously with the backing film to the downstream peeling plate 41 and the attaching roller 42.

[0046] The patch film (i.e., the raw material film strip used to make strip patches) and the backing film are pressed together at the pressing assembly 43 to form a composite film strip in which the patch film is attached to the surface of the backing film. The composite film strip then enters the slitting assembly 44, where the upper circular blade cuts downwards from above, and the lower slitting roller 441 provides support as the bottom roller. The cutting depth of the upper circular blade 442 is precisely controlled to cut only the patch film without cutting the backing film, thereby forming multiple strip patches arranged at intervals along the length direction on the backing film. Each strip patch still moves synchronously with the backing film.

[0047] The online continuous production and feeding of strip patches is achieved through the cooperation of the pressing component 43 and the slitting component 44. There is no need to prepare special film tapes with strip patches in advance, which reduces material costs and material preparation complexity. Since the upper circular blade 442 only cuts the patch film and not the backing film, the strip patches still maintain their original arrangement and spacing on the backing film, which facilitates subsequent peeling and transfer. At the same time, by changing the patch film of different specifications or adjusting the cutting spacing of the upper circular blade 442, the size and spacing of the strip patches can be flexibly adjusted to meet the production needs of products of different specifications.

[0048] The backing film serves merely as a carrier for cutting and moving the strip patch. After the strip patch separates from the backing film, the separated backing film becomes waste material. If it is not collected and processed in a timely manner, the waste backing film will scatter inside or around the equipment, not only affecting the normal operation of the equipment but also potentially causing equipment malfunctions by getting tangled in moving parts. It also negatively impacts the cleanliness of the workshop environment. Therefore, in this embodiment, the attaching unit 4 further includes a backing film take-up roller 45. After the strip patch separates from the backing film, the separated backing film is turned and moved to the backing film take-up roller 45 by the action of the peeling plate 41, and collected into a roll. The backing film take-up roller 45 enables automatic winding and collection of the separated backing film, avoiding equipment malfunctions and environmental problems caused by the scattering of waste backing film, ensuring a clean and orderly production site. Furthermore, the backing film is collected in rolls, facilitating subsequent unified processing or recycling.

[0049] After the double-sided tape is unwound, the first release layer needs to be peeled off from the surface of the adhesive layer to expose the adhesive layer for subsequent application of strip patches. In this embodiment, the film-tearing unit 3 includes a separation shaft 31 and a first release film winding shaft 32. The double-sided tape is led out from the tape unwinding shaft 21 and reversed around the separation shaft 31. The first release layer and the adhesive layer are separated at the separation shaft 31. The separated first release layer is wound up by the first release film winding shaft 32. After being processed by the film-tearing unit 3, the surface of the adhesive layer of the double-sided tape faces upward, and the carrier layer and the adhesive layer move together to the application unit 4. The double-sided tape changes direction at the separation shaft 31. Since the peel force between the first release layer and the adhesive layer is less than the adhesive force between the adhesive layer and the carrier layer, the first release layer separates from the adhesive layer during the turning process. The separated first release layer is guided to the first release film winding shaft 32 for winding, while the carrier layer continues to move forward with the adhesive layer. By controlling the position and angle of the separation shaft 31, the adhesive layer surface of the double-sided tape after the film is peeled is made to face upward, which facilitates the subsequent application of strip patches.

[0050] By setting the separation shaft 31 and the first release film winding shaft 32, the continuous and stable peeling and synchronous winding of the first release layer are realized, ensuring the continuity and stability of the film peeling process. The adhesive layer is subjected to uniform force during the film peeling process, and it is not easy to produce tensile deformation or wrinkles. After the film is peeled, the surface of the adhesive layer faces upward, providing a favorable operating angle and space for subsequent application of strip patches, which facilitates the application unit 4 to perform the application operation.

[0051] After the strip patches are attached to the adhesive layer surface, some areas of the adhesive layer are still exposed (the gaps between the strip patches). If these exposed adhesive surfaces are not protected, they will stick together or adhere to equipment parts during subsequent cutting, conveying, and receiving processes, resulting in product scrap. Therefore, in this embodiment, the upper film coating unit 5 is located downstream of the bonding unit 4 and includes an upper film coating roller 51 and a lower film coating roller that are arranged opposite to each other and press against each other, as well as a second release film feeding shaft 53 located above the upper film coating roller. A roll of second release film is sleeved on the second release film feeding shaft 53. The second release film and the intermediate composite belt from the bonding unit pass through the space between the upper film coating roller 51 and the lower film coating roller 52. When the second release film passes through, it presses against one side of the strip patch attached to the intermediate composite belt. Through the cooperation of the upper film coating roller 51 and the lower film coating roller 52, which are arranged opposite to each other in the upper film coating unit 5, and the second release film feeding shaft 53, the second release film is covered on the strip patch side of the middle composite belt, which effectively protects the exposed parts of the attached strip patch and adhesive layer, and avoids the adhesive surfaces from sticking together or being contaminated during the subsequent cutting and material collection process. At the same time, the second release film serves as the final release carrier for the sheet double-sided adhesive, which facilitates the storage and use of the finished product.

[0052] After the composite tape to be cut is formed, it needs to be precisely cut into multiple independent sheet-like double-sided adhesives. Therefore, in this embodiment, the cutting unit 6 includes a cutting platform 61, which is arranged downstream of the upper coating unit 5 along the process direction. The upper side of the cutting platform 61 is provided with a traction roller group 62 and a cutter assembly 63 along the process direction. The traction roller group 62 includes several traction rollers pressed onto the upper side of the cutting platform 61. The composite tape to be cut passes between the traction rollers and the cutting platform 61. The cutter assembly is arranged downstream of the traction roller group 62 and includes a cutter spanning above the cutting platform 61 and a drive unit for driving the cutter to rise and fall. The cutter moves downward under the drive unit and cuts the composite tape to be cut at the position corresponding to the strip patch to form independent sheet-like double-sided adhesives. A receiving frame is provided below the cutting platform 61. The cut sheet-like double-sided adhesives fall into the receiving frame through the end of the cutting platform 61. By setting up the cutting platform 61, the traction roller group 62, and the liftable cutter, precise traction and positioning cutting of the composite tape to be cut are achieved. The traction roller group 62 ensures that the composite tape to be cut enters the cutting area at a stable speed and in a straight state. The cutter cuts at the position corresponding to the strip patch, ensuring that the edge of each finished sheet of double-sided tape retains part of the strip patch as a gripping part, resulting in good cutting quality and neat cuts. A receiving box is set below the cutting platform 61 to realize the automatic collection of finished products, eliminating the need for manual picking up one by one and improving production efficiency.

[0053] In another embodiment, a method for producing substrate-free double-sided adhesive is provided, including: A double-sided tape is provided, which includes at least a first release layer, an adhesive layer and a carrier layer stacked in sequence. At this time, the double-sided tape is continuously output from the unwinding shaft under the action of traction force and enters the downstream process.

[0054] The first release layer is peeled off to expose the surface of the adhesive layer. Specifically, the double-sided tape enters the film-tearing unit and undergoes a large-angle turn at the separation shaft 31. Under the action of the turning force, the first release layer separates from the adhesive layer, and the separated first release layer is wound up by the first release film winding shaft 32. After this step, the double-sided tape is left with only the adhesive layer and the carrier layer, and the surface of the adhesive layer is fully exposed with the surface facing upwards.

[0055] Multiple strip-shaped patches are attached at intervals along the length of the exposed surface of the adhesive layer to obtain an intermediate composite strip. Specifically, the double-sided adhesive tape after the film is peeled off enters the attachment unit 4. At the same time, the strip-shaped patches prepared online or in advance are fed into the attachment unit 4 through the backing film. The strip-shaped patches are separated from the backing film at the peeling plate 41, and then transferred and attached to the exposed surface of the adhesive layer at the attachment roller 42. Multiple strip-shaped patches are arranged at preset intervals along the length of the double-sided adhesive tape to obtain an intermediate composite strip.

[0056] A second release layer is applied to the strip patch side of the intermediate composite belt to form a composite belt to be cut. Specifically, the intermediate composite belt enters the upper coating unit, and the second release film is drawn out from the second release film feeding shaft 53 and applied from above to the strip patch side of the intermediate composite belt. Under the pressing action of the upper and lower coating pressure rollers 52, the second release film is attached to the strip patch side of the intermediate composite belt, fully covering the exposed surfaces of the strip patch and the adhesive layer to form a composite belt to be cut.

[0057] The composite tape to be cut is cut along the cutting line corresponding to the position of the strip patch to obtain multiple independent sheet double-sided adhesives, wherein the cutting line is located in the middle region of the strip patch so that each sheet double-sided adhesive has a residual portion of the strip patch on both opposite cut edges. Specifically, the composite tape to be cut enters the cutting unit 6, and the traction roller group 62 steps it to the area below the cutter. The cutter cuts along the cutting line corresponding to the position of the strip patch. At this time, the position of the cutting line is precisely controlled in the middle area of ​​the strip patch width direction. That is, the width data and spacing data of the strip patch are pre-stored in the control system. The step feeding distance of the traction roller is set to the spacing between two adjacent strip patches plus half the width of one strip patch, so that when the cutter cuts, the blade falls exactly in the middle of a certain strip patch. In this way, two sheet double-sided adhesives are formed simultaneously in one cutting operation. For the product located upstream of the cutter, the downstream cutting edge retains the rear half of the strip patch, and for the product located downstream of the cutter, the upstream cutting edge retains the front half of the strip patch. After multiple consecutive cuts, multiple independent sheet double-sided adhesives are obtained, and each sheet double-sided adhesive has two opposite cutting edges (i.e., the upstream edge and downstream edge formed by the cutter) containing the residual part of the strip patch.

[0058] Through the above methods and steps, fully automated production of substrate-free double-sided tape from raw materials to finished products is achieved. In particular, by setting the cutting line in the middle area of ​​the strip patch, each sheet of double-sided tape contains residual portions of the strip patch on both opposite cut edges. That is, each sheet of double-sided tape has gripping parts (partial strip patch) at both ends (in actual production, the first and last sheet of double-sided tape do not involve cutting at the beginning and end, so only one face has the strip patch, but this does not affect the removal of the second release film). This allows operators to easily pinch the gripping parts for peeling regardless of which end they pick up the product from, further improving ease of use. During the process of attaching strip patches to the adhesive layer surface, the attachment spacing between each strip patch directly determines the size and material utilization rate of the final sheet double-sided tape product. Uneven attachment spacing will result in inconsistent product dimensions after cutting. More importantly, the attachment spacing of the strip patches needs to be flexibly adjusted according to order requirements—different customers and different application scenarios have different length requirements for sheet double-sided tape, and the production equipment must have the ability to quickly adjust the attachment spacing. Therefore, in this embodiment, multiple strip patches are attached at intervals along the length direction on the exposed surface of the adhesive layer to obtain a defined intermediate composite strip, including: First, the patch film and the backing film are pressed together to form a composite film strip, wherein the patch film is attached to one side surface of the backing film, and the two move synchronously.

[0059] Then, along the length of the composite film strip, only the patch film is cut to form multiple strip patches arranged along its length on the backing film. Each strip patch still moves synchronously with the backing film. At this time, the composite film strip enters the slitting assembly 44, and the upper circular blade 442 cuts the patch film at preset intervals (the interval corresponds to the width of the strip patch) along the length of the composite film strip, but the backing film remains continuous. After this step, multiple strip patches arranged along their length are formed on the backing film. Each strip patch still adheres to the surface of the backing film by its own adhesiveness and moves synchronously with the backing film.

[0060] Next, a peeling plate 41 is set up, causing the backing film to turn and move forward via the peeling plate 41. At the peeling plate 41, the strip patch gradually separates from the backing film, and the backing film and the strip patch on it move to the peeling plate 41. At this time, on the peeling side of the peeling plate 41, the strip patch gradually separates from the backing film.

[0061] At the same time, the adhesive layer and the carrier layer that peel off the first release layer move continuously on the outside of the release plate 41 along its traveling direction, that is, the adhesive layer and the carrier layer after the film peeling treatment move continuously on the outside of the release plate 41 along its traveling direction.

[0062] The support film and the strip patches on it are controlled to move intermittently in a stepping manner, so that the strip patches separated at the peeling plate 41 are sequentially transferred to the outside of the adhesive layer of the carrier layer and attached to each other at intervals in the direction of travel of the carrier layer. The carrier layer's travel speed and the stepping stroke of the support film are adjusted to maintain a preset spacing between the strip patches attached to the adhesive layer. The key control strategy is that the movement of the support film and the strip patches on it is not a uniform and continuous movement, but an intermittent movement in a stepping manner. Specifically, the drive roller of the support film is controlled by a servo motor, and its movement mode is a stepping cycle of forward, stop, forward, stop. In each stepping cycle, the support film moves forward a certain distance (i.e., the stepping stroke), which is equal to the original spacing between two adjacent strip patches on the support film (determined by the slitting component 44), and then stops and waits. During the waiting time, the carrier layer and the adhesive layer move forward a certain distance at a certain speed.

[0063] By adjusting the travel speed of the carrier layer and the stepping distance and stopping time of the backing film, the spacing between the strip patches attached to the adhesive layer can be precisely controlled to maintain the preset spacing value.

[0064] By controlling the intermittent movement of the backing film in a stepping manner, and continuously moving the adhesive layer and the carrier layer after the film has been peeled off, the strip patches are applied to the adhesive layer surface at intervals. By adjusting the travel speed of the carrier layer and the stepping stroke of the backing film, the spacing between the strip patches applied to the adhesive layer can be flexibly controlled to meet the production needs of double-sided adhesive sheets of different sizes and specifications. This method has a wide range of applications, is easy to adjust, and has high application accuracy. The spacing between each strip patch is uniform, ensuring the dimensional consistency of the final product.

[0065] The aforementioned substrate-free double-sided tape laminating and die-cutting machine and production method, by sequentially setting up an unwinding unit 2, a film-tearing unit 3, an attaching unit 4, an overlaying unit 5, and a cutting unit 6 along the process direction, constructs a fully automated processing production line from unwinding the double-sided tape raw material to cutting the finished sheet double-sided tape. The units are continuously connected and cooperate with each other, without the need for manual transfer intervention, which significantly improves the production efficiency and product consistency of substrate-free double-sided tape, and reduces the risk of contamination and damage to the adhesive surface caused by manual operation.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A substrate-free double-sided adhesive bonding and die-cutting machine, characterized in that, include: The machine frame, and the unwinding unit, film-tearing unit, laminating unit, overlaying unit, and cutting unit arranged sequentially along the process direction on the machine frame. The unwinding unit includes a tape unwinding shaft for holding rolls of double-sided adhesive tape. The double-sided adhesive tape includes at least a first release layer, an adhesive layer, and a carrier layer stacked sequentially. The film-peeling unit is located downstream of the unwinding unit and peels off the first release layer of the double-sided tape to expose the surface of the adhesive layer. The attaching unit is located downstream of the film-peeling unit. It transfers and attaches strip-shaped patches at intervals along the length of the double-sided adhesive tape to the exposed surface of the adhesive layer, forming an intermediate composite tape. The upper film unit is located downstream of the attachment unit, and a second release film is applied to the side of the intermediate composite strip where the strip patch is attached, forming a composite strip to be cut. The cutting unit is located downstream of the upper coating unit and cuts the composite strip to be cut along the position corresponding to the strip patch to form multiple independent sheet double-sided adhesives, and each sheet double-sided adhesive retains a portion of the strip patch at at least one cut edge.

2. The substrate-free double-sided adhesive bonding and die-cutting machine according to claim 1, characterized in that, The attachment unit includes a peeling plate having a peeling side. A backing film with strip-shaped patches is conveyed to the peeling plate and the backing film is turned and moved forward through the peeling side. The strip-shaped patches and the backing film are gradually separated at the peeling side.

3. The substrate-free double-sided adhesive bonding and die-cutting machine according to claim 2, characterized in that, The attaching unit also includes an attaching roller, which is disposed on the outside of the peeling plate. There is a gap between the attaching roller and the peeling side of the peeling plate for the backing film and the carrier layer to pass through. After the double-sided tape is peeled off by the film-tearing unit, it passes through the gap and wraps around to the outer surface of the attaching roller. The strip-shaped patch that is separated from the backing film at the peeling side moves to the attaching roller under the drive of the backing film and is attached to the adhesive layer surface of the double-sided tape that has wrapped around the attaching roller.

4. The substrate-free double-sided adhesive bonding and die-cutting machine according to claim 3, characterized in that, The bonding unit further includes a pressing assembly and a slitting assembly. The pressing assembly includes an upper pressing roller and a lower pressing roller that are arranged opposite each other and press against each other. The patch film to be bonded and the backing film pass between the upper pressing roller and the lower pressing roller and are pressed together to form a composite film strip. The slitting assembly is located downstream of the pressing assembly and includes a lower slitting roller and an upper circular blade that are arranged opposite each other. The composite film strip passes between the lower slitting roller and the upper circular blade. The upper circular blade cuts only the patch film along the width direction of the composite film strip to form strips of patch film arranged at intervals on the backing film.

5. The substrate-free double-sided adhesive bonding and die-cutting machine according to claim 4, characterized in that, The attaching unit also includes a bottom film take-up roller. After the strip patch is separated from the bottom film, the separated bottom film is turned and moved to the bottom film take-up roller under the action of the peeling plate and collected into a roll.

6. The substrate-free double-sided adhesive bonding and die-cutting machine according to any one of claims 1 to 5, characterized in that, The film-tearing unit includes a separation shaft and a first release film winding shaft. The double-sided tape is led out from the tape unwinding shaft and reversed around the separation shaft. The first release layer and the adhesive layer are separated at the separation shaft. The separated first release layer is wound up by the first release film winding shaft. After being processed by the film-tearing unit, the adhesive layer of the double-sided tape faces upward, and the carrier layer and the adhesive layer move together to the attachment unit.

7. The substrate-free double-sided adhesive bonding and die-cutting machine according to any one of claims 1 to 5, characterized in that, The upper coating unit is located downstream of the bonding unit and includes an upper coating roller and a lower coating roller that are arranged opposite each other and press against each other, and a second release film feeding shaft located above the upper coating roller. A roll of second release film is sleeved on the second release film feeding shaft. The second release film and the intermediate composite belt from the bonding unit pass through the space between the upper coating roller and the lower coating roller. When the second release film passes through, it is pressed and attached to one side of the strip patch of the intermediate composite belt.

8. The substrate-free double-sided adhesive bonding and die-cutting machine according to any one of claims 1 to 5, characterized in that, The cutting unit includes a cutting platform disposed downstream of the upper coating unit along the process direction. A traction roller group and a cutting assembly are provided on the upper side of the cutting platform along the process direction. The traction roller group includes several traction rollers pressed onto the upper side of the cutting platform. The composite tape to be cut passes between the traction rollers and the cutting platform. The cutting assembly is disposed downstream of the traction roller group and includes a cutter spanning above the cutting platform and a drive unit for driving the cutter to move up and down. The cutter moves downward under the drive unit and cuts the composite tape to be cut at the position corresponding to the strip patch to form an independent sheet of double-sided adhesive. A receiving frame is provided below the cutting platform. The cut sheet of double-sided adhesive falls into the receiving frame through the end of the cutting platform.

9. A method for producing substrate-free double-sided adhesive, characterized in that, include A double-sided tape is provided, the double-sided tape comprising at least a first release layer, an adhesive layer and a carrier layer stacked sequentially; Peel off the first release layer to expose the surface of the adhesive layer; Multiple strip patches are attached at intervals along the length of the exposed surface of the adhesive layer to obtain an intermediate composite strip; A second release layer is applied to the strip patch side of the intermediate composite strip to form the composite strip to be cut. The composite tape to be cut is cut along the cutting line corresponding to the position of the strip patch to obtain multiple independent sheet-like double-sided adhesives; The cutting line is located in the middle region of the strip patch, so that each sheet of double-sided adhesive contains a residual portion of the strip patch on both opposite cut edges.

10. The method for producing substrate-free double-sided adhesive according to claim 9, characterized in that, On the exposed surface of the adhesive layer, multiple strip-shaped patches are attached at intervals along the length direction to obtain an intermediate composite strip comprising: The patch film and the backing film are pressed together to form a composite film strip, wherein the patch film is adhered to one side surface of the backing film. Along the length of the composite film strip, only the patch film is cut to form multiple strip-shaped patches arranged along its length on the backing film. Each strip patch still moves synchronously with the backing film. A peeling plate is installed so that the backing film is turned and moved forward. At the peeling plate, the strip patch gradually separates from the backing film. The adhesive layer and the carrier layer of the first release layer are continuously moved along the direction of travel on the outside of the release plate. The support film and its strip patches are controlled to move intermittently in a stepping manner, so that the strip patches separated at the release plate are sequentially transferred to the outside of the adhesive layer of the carrier layer and attached to each other at intervals in the direction of travel of the carrier layer. In this process, by adjusting the travel speed of the carrier layer and the stepping stroke of the backing film, the strip patches attached to the adhesive layer maintain a preset spacing.

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