Paper and film roll composite production line with automatic peeling mechanism and use method thereof

Abstract

A paper and film roll composite production line with an automatic peeling mechanism comprises an unwinding mechanism, a coating mechanism is provided downstream of the unwinding mechanism, and a composite mechanism is provided downstream of the coating mechanism; an automatic peeling mechanism is provided downstream of the composite mechanism; the automatic peeling mechanism comprises a circulating conveyor belt, a first pressure roller, and a second pressure roller; the circulating conveyor belt is provided with a plurality of suction holes, a negative pressure air chamber is provided below the upper half of the circulating conveyor belt, a top plate is fixedly provided on the top of the negative pressure air chamber, the upper surface of the top plate is close to the lower surface of the upper half of the circulating conveyor belt, and a plurality of air guide holes are provided on the top plate; the negative pressure air chamber is provided with an exhaust port, and the exhaust port is connected to a negative pressure exhaust device. The present invention can automatically and conveniently peel paper and film rolls on the same production line of the composite process. The present invention also provides a method for using the above composite production line.

Description

Technical Field

[0001] The invention belongs to the technical field of paper processing, and in particular relates to a paper and film roll composite production line with an automatic peeling mechanism and a use method thereof. Background Art

[0002] In order to make the paper surface appear bright and wear-resistant, people usually add a paper surface protective film on the paper surface. The traditional methods of making paper surface protective film are divided into two categories: the first is to laminate a layer of transparent plastic film on the paper surface, and the second is to directly coat a layer of resin on the paper surface.

[0003] The disadvantages of the first production method are obvious: 1. The thickness of the protective layer (plastic film) is too large; 2. The surface of the transparent plastic film is easily worn and the brightness is poor; 3. After the paper and the plastic film are attached, the paper is difficult to recycle, causing serious environmental problems. Therefore, the first production method has been gradually eliminated.

[0004] However, the second production method also has many disadvantages: 1. After the resin layer is coated on the surface of the paper, its decorative effect appears dull. This is because, no matter what coating method is used, its outer surface (the exposed surface) is not easy to form a very flat, bright glossy surface, nor is it easy to form a matte surface. If further decorative treatment is required, it can generally only be formed into a laser texture pattern by molding. However, since the resin layer has been basically solidified during molding, molding is difficult, and the resulting concave-convex texture pattern is unclear, and the reaction force on the concave-convex texture of the molded plate is large. 1. It causes great erosion on the concave and convex texture of the embossing plate, resulting in less use of the embossing plate; 2. When selecting the material for the resin layer, it is required to have both good viscosity (otherwise it is easy to peel off from the paper surface) and good hardness (otherwise it will be scratched), and the two are often not achieved at the same time; 3. After the resin layer is coated on the surface of the paper, it is easy to be impregnated, which may not only stain the original ink pattern on the surface of the paper, but also cause further differentiation of the resin layer. Specifically, the more severely impregnated the area, the less resin layer remains on its surface, so its surface appears concave and uneven, and affects the appearance of the outer surface of the resin layer.

[0005] In order to solve the above problems, the applicant has designed a method for producing a paper surface protective film and applied for an invention patent to the State Intellectual Property Office, with patent number CN201610199254.X. The main steps of the invention patent are as follows: (1) select a plastic film and treat one side of the plastic film as needed so that the surface of the plastic film is formed with a concave-convex laser pattern or / and a matte area or / and a bright area; (2) directly apply a wet resin layer on the treated surface of the plastic film; then, dry and solidify the resin layer, roll it up to form a semi-finished composite roll for standby use; (3) unwind the semi-finished composite roll and apply an adhesive layer on the resin layer; (4) before the adhesive layer is completely dried and solidified, press the paper on the adhesive layer; (5) dry and solidify the adhesive layer so that the adhesive layer adheres the paper and the resin layer together; (6) peel the plastic film from the paper and roll up the peeled plastic film; the resin layer attached to the paper forms a protective film for the paper, and the outer surface of the resin layer is formed with a concave-convex pattern or / and a matte area or / and a bright area corresponding to the surface of the plastic film. The protective film obtained by the invention patent technology has a concave-convex texture pattern and / or a matte area and / or a bright area, and has a good decorative effect.

[0006] However, the applicant has found in production practice that, in the peeling process of step (6), if a conventional plastic film and paper peeling device is used, it is generally necessary to first use a sharp and thin peeling knife to peel off the edge or corner of the paper, and then tear the two apart. This brings the following problems: first, the paper and the plastic film are easily scratched by the blade. Although it is very slight and the area is very small, it still affects the appearance of the paper as a high-end printing material and is not conducive to the multiple recycling of the film; second, because it is necessary to use a sharp and thin peeling knife to peel off the edge or corner of the paper, the speed cannot be too fast (otherwise it is more likely to be scratched), resulting in a peeling speed that cannot be too fast, that is, the peeling speed cannot keep up with the laminating speed, and therefore the peeling step and the laminating step cannot be performed on the same production line (the speed requirements of the two processes on the same production line must match each other). Therefore, the composite film material obtained after the plastic film and paper are laminated must be rolled up and then transferred to a special peeling device for peeling, which is obviously more troublesome.

[0007] In this application document, paper refers to individual sheets of paper, which are not in a continuous roll. Continuously rolled paper is called a paper roll, which does not belong to the paper of this application. Summary of the invention

[0008] The purpose of the present invention is to solve the above problems and provide a paper and film roll composite production line with an automatic peeling mechanism and a method of using the same, which can quickly and conveniently peel paper and film rolls automatically on the same production line of the composite process.

[0009] The purpose can be achieved according to the following scheme: it includes an unwinding mechanism, a coating mechanism for coating adhesive material is provided downstream of the unwinding mechanism, and a compounding mechanism for compounding paper and plastic film is provided downstream of the coating mechanism; its main feature is that an automatic peeling mechanism is provided downstream of the compounding mechanism; the automatic peeling mechanism includes a circulating conveyor belt, a first pressure roller, and a second pressure roller; transmission shafts are provided at both ends of the circulating conveyor belt, and the two transmission shafts are respectively a first transmission shaft and a second transmission shaft, the central axis direction of the first transmission shaft is parallel to the second transmission shaft, the first transmission shaft is close to the upstream end of the upper half of the circulating conveyor belt, and the second transmission shaft is close to the downstream end of the upper half of the circulating conveyor belt; the circulating conveyor belt is provided with a plurality of suction holes, A negative pressure air chamber is provided below the upper half of the conveyor belt, and a horizontal top plate is fixedly provided on the top of the negative pressure air chamber, and the upper surface of the horizontal top plate is close to the lower surface of the upper half of the circulating conveyor belt, and the horizontal top plate is provided with a plurality of air guide holes; the negative pressure air chamber is provided with an air suction port, and the air suction port is connected to a negative pressure air suction device; the first pressure roller is located above the first transmission shaft, and the first pressure roller presses against the upstream end of the upper half of the circulating conveyor belt; the second pressure roller is located above the middle part of the upper half of the circulating conveyor belt, and the second pressure roller presses against the upper surface of the middle part of the upper half of the circulating conveyor belt; the central axis directions of the first pressure roller and the second pressure roller are parallel to the first transmission shaft; a winding mechanism for winding up plastic film is provided downstream of the second pressure roller; and a paper collecting mechanism is provided downstream of the circulating conveyor belt.

[0010] Preferably, a third pressing roller is provided above the second transmission shaft, and the third pressing roller presses against the downstream end of the upper half of the endless conveyor belt.

[0011] A method for using a paper and film roll composite production line with an automatic peeling mechanism, characterized by comprising the following steps:

[0012] (1) The unwinding mechanism gradually unwinds the plastic film with the resin layer attached to the surface;

[0013] (2) The plastic film with the resin layer attached thereto moves downstream and passes through a coating mechanism, which coats an adhesive layer on the surface of the resin layer;

[0014] (3) The plastic film with the adhesive layer and the resin layer continues to move downstream. When passing through the laminating mechanism, the laminating mechanism laminates the paper sheets onto the adhesive layer of the plastic film one by one along the length direction of the plastic film. However, the front end section of each paper sheet does not contact the adhesive layer. The adhesive layer condenses and the paper sheets and the resin layer are bonded together. In each adjacent two paper sheets, the rear end section of the front paper sheet is sandwiched between the front end section of the rear paper sheet and the adhesive layer of the plastic film, and the front end section of the rear paper sheet is separated from the adhesive layer by the rear end section of the front paper sheet.

[0015] (4) The plastic film compounded with the paper continues to move downstream and reaches the automatic stripping mechanism; the circulating conveyor belt of the automatic stripping mechanism keeps rotating, and the negative pressure exhaust device keeps the negative pressure chamber to form a negative pressure, and the negative pressure is transmitted to the suction hole of the circulating conveyor belt through the air guide hole of the horizontal top plate; when the plastic film compounded with the paper passes between the circulating conveyor belt and the first pressing roller, the plastic film is pressed against the first pressing roller, and the paper is pressed against the circulating conveyor belt;

[0016] (5) The suction holes of the circulating conveyor belt suck the paper, and the plastic film compounded with the paper continues to move along with the circulating conveyor belt. When the front end of the paper passes the position directly below the central axis of the second pressing roller, the plastic film moves along the circumferential direction of the second pressing roller due to the tension of the winding mechanism, and the front end of the paper continues to be sucked by the suction holes of the circulating conveyor belt and remains in contact with the circulating conveyor belt, so that the front end of the paper and the plastic film diverge;

[0017] (6) As the circulating conveyor belt continues to rotate, the entire sheet of paper moves horizontally along with the circulating conveyor belt, while the corresponding portion of the plastic film bypasses the second pressing roller and moves downstream, so that the paper and the plastic film are completely separated; during this period, since the bonding force between the plastic film and the resin layer is smaller than the bonding force between the paper and the resin layer, the resin layer remains bonded to the paper, while the resin layer is peeled off from the plastic film;

[0018] (7) The plastic film moves toward the winding mechanism and is wound, while the paper with the resin layer attached continues to move downstream and is collected by the paper collecting mechanism.

[0019] Preferably, in the above step (7), when the paper with the resin layer attached continues to move between the third pressure roller and the circulating conveyor belt along the circulating conveyor belt, the third pressure roller and the circulating conveyor belt continue to move the paper downstream with the paper being sandwiched, and the paper leaves the circulating conveyor belt.

[0020] In this application document, the so-called "upstream" and "downstream" are determined according to the running direction of the film material (paper) during the production process. During the production process, the position that the film material (paper) passes through first is the upstream position, and the position that the film material (paper) passes through later is the downstream position. The film material (paper) runs from upstream to downstream. The so-called "above" and "below" are based on the concept of daily spatial orientation.

[0021] When considering the front-to-back relationship between two adjacent sheets of paper, the sheet of paper that first passes through the first pressing roller in the production process is the front sheet of paper, and the sheet of paper that passes through the first pressing roller later is the back sheet of paper.

[0022] Similarly, when defining the front and rear end sections of the same sheet of paper, the end section that first passes through the first pressure roller during operation is the front end section of the paper, and the end section that passes through the first pressure roller later is the rear end section of the paper.

[0023] The present invention has the following advantages and effects:

[0024] 1. The present invention can automatically peel off paper and plastic film quickly and conveniently, and the peeling speed is fast and can match the laminating speed, so that online peeling can be realized on the laminating production line.

[0025] 2. The first pressing roller and the second pressing roller work together to make the paper adhere more densely and over a larger area to the upper surface of the upper half of the circulating conveyor belt, so that the air suction holes in the upper half of the circulating conveyor belt are more densely covered, which is conducive to making the vacuum degree of the negative pressure chamber higher, and then making the circulating conveyor belt more effectively adsorb the paper, and ensuring smooth peeling.

[0026] 3. During the peeling process, neither the paper nor the plastic film will be scratched. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure and working status of a specific embodiment of the present invention.

[0028] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the lower middle part.

[0029] Figure 3 yes Figure 1 A partial enlarged schematic diagram of the middle part.

[0030] Figure 4 yes Figure 2 Middle G is a partial enlarged schematic diagram.

[0031] Figure 5 yes Figure 2 Middle H is a partial enlarged schematic diagram.

[0032] Figure 6 yes Figure 2 Schematic diagram of the partial enlargement of K in the middle.

[0033] Figure 7 yes Figure 2 Schematic diagram of the local enlargement of the middle Q.

[0034] Figure 8 yes Figure 3 Schematic diagram of the partial enlargement of M in the middle.

[0035] Fig. 9 yes Figure 3 Schematic diagram of the local enlargement of N in the middle.

[0036] Fig.10 yes Figure 3 Schematic diagram of the partial enlargement of R in the middle. DETAILED DESCRIPTION Embodiment 1

[0037] Figure 1 , Figure 2 , Figure 3 The paper and film roll composite production line with an automatic peeling mechanism shown in the figure comprises an unwinding mechanism 11, a coating mechanism 12 for coating adhesive material is provided downstream of the unwinding mechanism 11, a composite mechanism 13 for composite paper and plastic film is provided downstream of the coating mechanism 12; an automatic peeling mechanism is provided downstream of the composite mechanism 13; the automatic peeling mechanism comprises an endless conveyor belt 2, a first pressing roller 71, and a second pressing roller 72; the upper half of the endless conveyor belt (such as Figure 3 The CD section in the middle is horizontal, and transmission shafts are sleeved at both ends of the endless conveyor belt 2. The two transmission shafts are a first transmission shaft 31 and a second transmission shaft 32. The central axis direction of the first transmission shaft 31 is parallel to the second transmission shaft 32. The first transmission shaft 31 is close to the upstream end of the upper half of the endless conveyor belt (at Figure 3 In the embodiment, the first transmission shaft 31 and the second transmission shaft 32 rotate counterclockwise during operation. Figure 3 As shown by the curved arrow in the middle, the upper half of the circulating conveyor belt runs to the left. Figure 3 As shown by the straight arrow in the middle, the upstream end of the upper half of the circulating conveyor belt is the right end of the upper half of the circulating conveyor belt, that is, Figure 3 The C end of the upper half of the circulating conveyor belt is the left end of the upper half of the circulating conveyor belt, that is, Figure 3 The second transmission shaft 32 is close to the downstream end of the upper half of the circulating conveyor belt; the circulating conveyor belt 2 is provided with a plurality of suction holes 20, in the upper half of the circulating conveyor belt (such as Figure 3 A negative pressure chamber 4 is provided below the CD section of the negative pressure chamber 4, and a horizontal top plate 5 is fixed on the top of the negative pressure chamber 4. The upper surface of the horizontal top plate 5 is close to the upper half of the circulating conveyor belt (such as Figure 3 The lower surface of the horizontal top plate 5 is provided with a plurality of air guide holes 50; the negative pressure air chamber 4 is provided with an air suction port 40, and the air suction port 40 is connected to a negative pressure air suction device; a first pressing roller 71 is provided above the first transmission shaft 31, and the first pressing roller 71 presses against the upstream end of the upper half of the circulating conveyor belt (i.e. Figure 3 The second roller 72 is located above the middle part of the upper half of the endless conveyor belt, and the second roller 72 presses against the upper surface of the middle part of the upper half of the endless conveyor belt; the central axis direction of the first roller 71 and the second roller 72 is parallel to the first transmission shaft 31. A third roller 73 is provided above the second transmission shaft 32, and the third roller 73 presses against the downstream end of the upper half of the endless conveyor belt (i.e. Figure 3 D end in the middle); a winding mechanism 61 for winding up the plastic film is provided downstream of the second pressing roller 72, and a paper collecting mechanism 62 for collecting paper is provided downstream of the circulating conveyor belt 2. Embodiment 2

[0038] A method for using the paper and film roll composite production line with an automatic peeling mechanism according to Embodiment 1 comprises the following steps:

[0039] (1) The unwinding mechanism 11 gradually unwinds the plastic film 90 with the resin layer 91 attached to the surface (the material of the resin layer 91 and the plastic film 90 is also called the semi-finished plastic film 9. The cross-sectional layer structure of the semi-finished plastic film 9 is as follows: Figure 4 As shown, it comprises two layers, namely a plastic film 90 and a resin layer 91);

[0040] (2) The plastic film 90 (i.e., the semi-finished plastic film 9) with the resin layer 91 attached thereto moves downstream and passes through the coating mechanism 12. The coating mechanism 12 coats an adhesive layer 92 on the surface of the resin layer 91. The cross-sectional layer structure after coating is as follows: Figure 5 As shown, that is, the local enlarged structure of H;

[0041] (3) The plastic film 90 with the adhesive layer 92 and the resin layer 91 continues to move downstream. When passing through the laminating mechanism 13, the laminating mechanism 13 laminates the paper sheets 8 one by one onto the adhesive layer 92 of the plastic film along the length direction of the plastic film. However, the front end section of each paper sheet does not contact the adhesive layer 92. The adhesive layer 92 condenses and the paper sheets 8 and the resin layer 91 are bonded together. In each adjacent two paper sheets 8, the rear end section 82 (such as Figure 7 The AB section in the figure) is clamped by the front end section 81 of the rear paper 8 (such as Figure 7 The front end section 81 of the rear paper and the adhesive layer 92 of the plastic film are separated by the rear end section 82 of the front paper. Figure 7 As shown;

[0042] (4) The plastic film 90 compounded with the paper 8 is called a composite film material 7. The cross-sectional layer structure of the composite film material 7 is as follows: Figure 6 , Figure 8 As shown, it includes four layers, namely, a plastic film 90, a resin layer 91, an adhesive layer 92 and a paper 8 in sequence; the composite film material 7 continues to move downstream and arrives at the automatic stripping mechanism; the circulating conveyor belt 2 of the automatic stripping mechanism keeps rotating, and the negative pressure exhaust device keeps the negative pressure air chamber 4 to form a negative pressure, and the negative pressure is transmitted to the suction hole 20 of the circulating conveyor belt 2 through the air guide hole 50 of the horizontal top plate 5; when the plastic film 90 (i.e., the composite film material 7) composited with the paper 8 passes between the circulating conveyor belt 2 and the first pressing roller 71, the plastic film 90 is pressed against the first pressing roller 71, and the paper 8 is pressed against the circulating conveyor belt 2;

[0043] (5) The suction holes 20 of the circulating conveyor belt 2 suck the paper 8, and the plastic film 90 (i.e., the composite film material 7) compounded with the paper 8 continues to move along with the circulating conveyor belt 2; when the front end section 81 of the paper 8 passes the position directly below the central axis of the second pressing roller 72, the plastic film 90 moves along the circumferential direction of the second pressing roller 72 due to the pulling force of the winding mechanism 61, and the front end section 81 of the paper continues to be sucked by the suction holes 20 of the circulating conveyor belt 2 and remains in contact with the circulating conveyor belt, so that the front end section 81 of the paper and the plastic film 90 diverge, as shown in FIG. Figure 3 , Fig. 9 As shown;

[0044] (6) As the endless conveyor belt 2 continues to rotate, the entire sheet of paper 8 moves horizontally along with the endless conveyor belt 2, while the corresponding portion of the plastic film 90 bypasses the second pressing roller 72 and moves downstream, so that the sheet of paper 8 and the plastic film 90 are completely separated; during this period, since the bonding force between the plastic film 90 and the resin layer 91 is less than the bonding force between the sheet of paper 8 and the resin layer 91, the resin layer 91 remains bonded to the sheet of paper 8, while the resin layer 91 is peeled off from the plastic film 90, as shown in FIG. Figure 3 , Fig. 9 As shown, the structure in which the paper 8 and the resin layer 91 are bonded together is as shown in Fig.10 As shown, the paper 8 and the resin layer 91 are laminated together by an adhesive layer 92;

[0045] (7) The plastic film 90 moves toward the winding mechanism 61 and is wound, while the paper 8 with the resin layer 91 attached thereto continues to move along the circulating conveyor belt 2. When the paper 8 with the resin layer attached thereto moves between the third pressure roller 73 and the circulating conveyor belt 2, the third pressure roller 73 and the circulating conveyor belt 2 sandwich the paper 8 and continue to move downstream. The paper 8 with the resin layer attached thereto leaves the circulating conveyor belt 2 and continues to move and is collected by the paper collecting mechanism 62.

Claims

1. A method for using a paper and film roll composite production line with an automatic peeling mechanism, the paper and film roll composite production line with an automatic peeling mechanism comprising an unwinding mechanism, a coating mechanism for coating an adhesive material is provided downstream of the unwinding mechanism, a composite mechanism for composite paper and plastic film is provided downstream of the coating mechanism; an automatic peeling mechanism is provided downstream of the composite mechanism; the automatic peeling mechanism comprises a circulating conveyor belt, a first pressure roller, and a second pressure roller; transmission shafts are sleeved at both ends of the circulating conveyor belt, the two transmission shafts are respectively a first transmission shaft and a second transmission shaft, the central axis direction of the first transmission shaft is parallel to the second transmission shaft, the first transmission shaft is close to the upstream end of the upper half of the circulating conveyor belt, and the second transmission shaft is close to the downstream end of the upper half of the circulating conveyor belt; the circulating conveyor belt is provided with a plurality of There are multiple air suction holes, a negative pressure air chamber is arranged below the upper half of the circulating conveyor belt, a horizontal top plate is fixedly arranged on the top of the negative pressure air chamber, the upper surface of the horizontal top plate is close to the lower surface of the upper half of the circulating conveyor belt, and the horizontal top plate is provided with multiple air guide holes; the negative pressure air chamber is provided with an air suction port, and the air suction port is connected to a negative pressure air suction device; the first pressure roller is located above the first transmission shaft, and the first pressure roller presses against the upstream end of the upper half of the circulating conveyor belt; the second pressure roller is located above the middle part of the upper half of the circulating conveyor belt, and the second pressure roller presses against the upper surface of the middle part of the upper half of the circulating conveyor belt; the central axis direction of the first pressure roller and the second pressure roller is parallel to the first transmission shaft; a winding mechanism for winding up plastic film is provided downstream of the second pressure roller; a paper collecting mechanism is provided downstream of the circulating conveyor belt; it is characterized in that The following steps are involved: (1) The unwinding mechanism gradually unwinds the plastic film with the resin layer attached to the surface; (2) The plastic film with the resin layer attached thereto moves downstream and passes through a coating mechanism, which coats an adhesive layer on the surface of the resin layer; (3) The plastic film with the adhesive layer and the resin layer continues to move downstream. When passing through the laminating mechanism, the laminating mechanism laminates the paper sheets onto the adhesive layer of the plastic film one by one along the length direction of the plastic film. However, the front end section of each paper sheet does not contact the adhesive layer. The adhesive layer condenses and the paper sheets and the resin layer are bonded together. In each adjacent two paper sheets, the rear end section of the front paper sheet is sandwiched between the front end section of the rear paper sheet and the adhesive layer of the plastic film, and the front end section of the rear paper sheet is separated from the adhesive layer by the rear end section of the front paper sheet. (4) The plastic film compounded with the paper continues to move downstream and reaches the automatic stripping mechanism; the circulating conveyor belt of the automatic stripping mechanism keeps rotating, and the negative pressure exhaust device keeps the negative pressure air chamber to form a negative pressure, and the negative pressure is transmitted to the suction hole of the circulating conveyor belt through the air guide hole of the horizontal top plate; when the plastic film compounded with the paper passes between the circulating conveyor belt and the first pressing roller, the plastic film is pressed against the first pressing roller, and the paper is pressed against the circulating conveyor belt; (5) The suction holes of the circulating conveyor belt suck the paper, and the plastic film laminated with the paper continues to move along with the circulating conveyor belt; when the front end of the paper passes the position directly below the central axis of the second pressing roller, the plastic film moves along the circumferential direction of the second pressing roller due to the tension of the winding mechanism, and the front end of the paper continues to be sucked by the suction holes of the circulating conveyor belt and remains in contact with the circulating conveyor belt, so that the front end of the paper and the plastic film diverge; (6) As the circulating conveyor belt continues to rotate, the entire sheet of paper moves horizontally along with the circulating conveyor belt, while the corresponding portion of the plastic film bypasses the second pressing roller and moves downstream, so that the paper and the plastic film are completely separated; during this period, since the bonding force between the plastic film and the resin layer is smaller than the bonding force between the paper and the resin layer, the resin layer remains bonded to the paper, while the resin layer and the plastic film are peeled off; (7) The plastic film moves toward the winding mechanism and is wound, while the paper with the resin layer attached continues to move downstream and is collected by the paper collecting mechanism.

Images