Pressing and recycling equipment and process based on TPU (Thermoplastic Polyurethane) vehicle cover base film recyclability

Abstract

The invention discloses a pressing and recycling device and process based on the recyclability of a TPU car cover base film, and belongs to the technical field of TPU car cover base films, the recycling machine comprises a material conveying roller used for outputting a TPU composite film, and the TPU composite film is transferred to the recycling machine from a winding drum in A1; the drawing rollers are used for drawing and conveying the TPU composite film; the winding roller is used for winding the TPU composite film after the PET embossed film is separated; the film tearing mechanism is used for separating the TPU composite film from the PET embossed film; according to the TPU base film laminating and pressing device, laminating and pressing are conducted on a TPU base film through the PET embossed film with pressing lines, traditional hot-pressing roller pressing is replaced, the pressing process is improved, and the line integrity and the yield of the TPU base film after pressing are improved; the film tearing mechanism and the recycling mechanism are designed to be used for tearing, recycling and reusing the PET embossed film of the TPU composite film, the raw material utilization rate is increased, meanwhile, recycling and reusing are promoted, and the cost of the pressing process is reduced.

Description

Technical Field

[0001] The invention discloses a TPU car cover base film technology, and in particular relates to a compression recycling device and a process based on the recyclability of the TPU car cover base film. Background Art

[0002] The film needs to be produced on a complete production line with many equipments. The raw materials need to be heated and melted in a melting machine first. The molten raw materials are extruded from the extruder to the mold and then cooled and formed in the gap between the molds.

[0003] In the production of TPU cast film for car cover base film with decorative textures such as airplane patterns, dot patterns, etc., the existing production method is that the molten raw material of the cast film is pulled out after being formed in a mold and then embossed by the embossing teeth on the hot pressing roller, and then rolled up to keep the shape for at least one day; when the embossing step is carried out by this method, when the hot pressing roller continuously embosses, due to the high viscosity of the TPU cast film, the TPU cast film adheres to the embossing on the hot pressing roller, and the viscosity is too high and it is easy to adhere to the hot pressing roller too tightly and deform, and it is impossible to accurately emboss the TPU cast film into a complete structure, resulting in a high deformation rate of the texture after embossing and a low yield rate. Therefore, a new process is needed to achieve embossing. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to provide a compression recycling device and process based on the recyclability of the TPU car cover base film.

[0005] To achieve the above object, the present invention provides the following technical solution: a compression recycling process based on the recyclability of TPU car cover base film, comprising the following steps:

[0006] S1, the cast film is extruded from the extruder, flows out through the die, is attached to the cast roller by the air knife, is pre-cooled to form a film, and is induced to stretch and pull into a TPU base film by multiple groups of traction rollers;

[0007] S2, the PET embossed film is unwound from the first unwinding mechanism to the laminating machine, and the PET protective film is unwound from the second unwinding mechanism to the laminating machine. The PET embossed film is output by the laminating machine and laminated with the TPU base film for embossing. The PET protective film on the other side is also output by the laminating machine and laminated with the TPU base film to obtain a TPU composite film. The TPU composite film is pulled to the trimming machine via a pulling roller for trimming, and then rolled into a cooling box for cooling and shaping.

[0008] A1, after cooling and shaping, the TPU composite film is transferred together with the roll to the recycling machine to tear off the PET embossed film for recycling;

[0009] The PET embossed film after film tearing and recycling is transferred to an unwinding mechanism to laminate and emboss the next batch of TPU base films. Repeating the cyclic lamination and embossing and film tearing and recycling completes the shaping and recycling.

[0010] Preferably, when the PET embossed film output by the laminator laminates the TPU base film, spaced slits are left on the TPU base film.

[0011] Preferably, for the shaping and recycling equipment based on the recyclability of the TPU car wrap base film, adopting the shaping and recycling process, the recycling machine includes:

[0012] A feeding roller for outputting the TPU composite film, transferred from the reel in A1 to the recycling machine;

[0013] Drawing rollers, including several groups, for traction and conveying of the TPU composite film;

[0014] A winding roller for winding the TPU composite film after separating the PET embossed film;

[0015] A film tearing mechanism for separating the TPU composite film and the PET embossed film;

[0016] A recycling mechanism for recycling the separated PET embossed film.

[0017] Preferably, the film tearing mechanism includes a film clamping movable part that can slide up, down, left, and right for transferring the PET embossed film, a heating roller for softening the PET embossed film, and a film pushing component. On one side of the film pushing component close to the film clamping movable part, there is a clamping plate that narrows and inclines along the conveying direction, and the clamping plate is provided with a cooling end face.

[0018] Preferably, the film clamping movable part is provided with a scraper and a clamping manipulator that can grab the end corners of the PET embossed film.

[0019] Preferably, the recycling mechanism is located below the film tearing mechanism, and is provided with a set of recycling rollers and an adsorption roller for intermittently adsorbing the PET embossed film and transferring it to the recycling rollers.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] First, in this application, the TPU base film is laminated and shaped by the PET embossed film with shaping patterns, replacing the traditional hot pressing roller shaping. Overcoming the characteristics that due to the relatively high viscosity of the TPU cast film, when shaping with the continuous traditional hot pressing roller, the viscosity of the TPU cast film is too high when adhering to the hot pressing roller, it is easily adhered too tightly to the hot pressing roller and deformed, and it is impossible to accurately shape a complete structure on the TPU cast film, resulting in a high deformation rate of the shaped patterns and a low yield rate. The shaping process is improved, and the integrity of the shaped patterns and the yield rate of the TPU base film after shaping are improved;

[0022] Second, the present application designs a film tearing mechanism and a recycling mechanism for tearing and recycling the PET embossed film of the TPU composite film, which improves the raw material utilization rate while promoting circular recycling and reduces the cost of the pressing process. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the pressing process flow of the pressing and recycling equipment based on the recyclability of the TPU car wrap base film;

[0024] Figure 2 It is a schematic structural diagram of the pressing and recycling equipment based on the recyclability of the TPU car wrap base film Figure 1 ;

[0025] Figure 3 It is a schematic structural diagram of the pressing and recycling equipment based on the recyclability of the TPU car wrap base film Figure 2 .

[0026] Reference numerals: 1, feeding roller; 2, film tearing mechanism; 3, recycling mechanism; 4, stretching roller; 5, winding roller; 6, film clamping movable part; 7, heating roller; 8, top film assembly; 9, clamping plate; 10, scraping plate; 11, clamping manipulator; 12, adsorption roller; 13, recycling roller; 14, first unwinding mechanism; 15, mold; 16, laminating machine; 17, second unwinding mechanism; 18, edge trimming machine; 19, cooling box. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figure 1 shown, the pressing and recycling process based on the recyclability of the TPU car wrap base film includes the following steps:

[0029] S1. After the cast film is extruded from the extruder, it flows out through the die 15 and is attached to the casting roller by the air knife for pre-cooling into a film, and then is induced, stretched and pulled by multiple groups of traction rollers to form a TPU base film. When the cast film is pre-cooled into a film, the temperature is set at 25-30°C, so that the TPU base film is not completely cooled and has a certain adhesiveness and plasticity, which is convenient for subsequent lamination and embossing with the PET embossed film.

[0030] S2. The PET embossed film is unrolled from a first unwinding mechanism 14 to the laminating machine 16, and the PET protective film is unrolled from a second unwinding mechanism 17 to the laminating machine 16. Through the laminating machine 16, the PET embossed film is output and laminated and embossed with the TPU base film, and on the other side, the PET protective film is also output through the laminating machine 16 and laminated with the TPU base film to obtain a TPU composite film. When the PET embossed film output by the laminating machine 16 laminates the TPU base film, spaced tear openings are left on the TPU base film. The spaced tear openings are formed by the laminating machine 16 pausing at intervals when laminating the TPU base film, so that the PET embossed film on the TPU composite film is not completely covered, leaving spaced tear openings that are easy to tear, which is convenient for subsequent film tearing mechanism 2 and recycling mechanism 3 to tear and recycle the film. The TPU composite film is pulled by the traction roller to the trimming machine 18 for trimming, and then wound onto the cooling box 19 for cooling and shaping. In the cooling box 19, the cooling air can be blown towards the TPU composite film through the air ring structure to take away the heat, so that after the PET embossed film embosses the TPU base film in the TPU composite film, it can be quickly cooled and shaped to form a complete embossed shape on the TPU base film. At the same time, the inner wall of the reel for winding the TPU composite film in the cooling box 19 can be set as a cooling mandrel to cool the TPU composite film synchronously from the inside out, preventing shrinkage caused by uneven cooling rates on both sides of the TPU composite film and improving the yield of the cooling and shaping integrity of the TPU composite film. Multiple groups of reels can be set in the cooling box 19 for switching, and grouped cooling is carried out after winding to improve the cooling and shaping efficiency.

[0031] A1. The cooled and shaped TPU composite film together with the reel is transferred to the recycling machine to tear and recycle the PET embossed film. For the embossing and recycling equipment based on the recyclability of the TPU car wrap base film, the recycling machine includes:

[0032] The feeding roller 1 is used to output the TPU composite film, which is transferred from the reel with the cooled and shaped TPU composite film to the recycling machine.

[0033] The stretching roller 4 includes several groups and is used to tractionally convey the TPU composite film.

[0034] The winding roller 5 is used to wind the TPU composite film after separating the PET embossed film.

[0035] The film tearing mechanism 2 is used to separate the TPU composite film and the PET embossed film.

[0036] The film tearing mechanism 2 includes a film clamping movable member 6 that can slide up and down and left and right for transferring the PET embossed film, a heating roller 7 for softening the PET embossed film, and a film pushing component 8. On one side of the film pushing component 8 close to the film clamping movable member 6, there is a clamping plate 9 that narrows and inclines along the conveying direction. The clamping plate 9 is provided with a cooling end face, and cooling is provided through circulating water cooling inside the cooling end face;

[0037] The film clamping movable member 6 is provided with a scraper 10 and a clamping manipulator 11 that can grab the end corners of the PET embossed film;

[0038] The recycling mechanism 3 is used to recycle the separated PET embossed film.

[0039] The recycling mechanism 3 is located below the film tearing mechanism 2 and is provided with a set of recycling rollers 13 and an adsorption roller 12 that intermittently adsorbs the PET embossed film and transfers it to the recycling rollers 13;

[0040] As Figures 2 - 3 shown, the processes of tearing the film and recycling the PET embossed film by the operation of the film tearing mechanism 2 and the recycling mechanism 3 are as follows:

[0041] The cooled and shaped TPU composite film transferred to the recycling machine is output from the feeding roller 1 and is traction-conveyed by multiple groups of stretching rollers 4. When the TPU composite film is conveyed past the heating roller 7, the heating roller 7 heats the TPU composite film on the side close to the PET embossed film and then conveys it to the film pushing component 8. After the TPU composite film follows the clamping plate 9 close to the film pushing component 8, the TPU composite film on the side close to the PET protective film gets cold, generating a cold and hot temperature difference with the TPU composite film on the other side, which causes the adhesion between the PET embossed film and the TPU base film to decrease. And when approaching the narrowing and inclined clamping plate 9, the PET embossed film separates from the TPU base film along the spaced tearing slits;

[0042] At this time, the scraper 10 of the film clamping movable member 6 jacks up the separated PET embossed film, and the clamping manipulator 11 clamps and grabs the end corners of the PET embossed film. The PET embossed film moves with the film clamping movable member 6 to the adsorption roller 12 of the recycling mechanism 3 below. After the adsorption roller 12 adsorbs the PET embossed film through a vacuum pump, it rotates and drives it to the recycling rollers 13 below. Then, the adsorption roller 12 releases the adsorption of the PET embossed film, and the continuously rotating recycling rollers 13 wind up and recycle the PET embossed film;

[0043] The film tearing mechanism 2 and the recycling mechanism 3 are respectively provided with visual detection devices for detecting the position of the PET embossed film and the spaced tearing slits, and can adjust the start and stop of the TPU composite film conveyance, the clamping action of the film clamping movable member 6 on the PET embossed film, and the start and stop of the adsorption of the adsorption roller 12 according to the visual image data transmitted to the industrial control computer for processing.

[0044] The PET embossed film after film tearing and recycling is transferred to the laminating machine 16 to laminate and emboss the TPU base film of the next batch. Repeatedly cycling through lamination and embossing and film tearing and recycling completes the embossing and recycling.

[0045] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0046] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. The embossing recycling process based on the recyclability of the TPU vehicle wrap base film is characterized in that It includes the following steps: S1. After the cast film is extruded from the extruder, it flows out through the die, is attached to the casting roll by the air knife for pre-cooling to form a film, and is induced, stretched and pulled by multiple groups of traction rolls to form a TPU base film; S2. The PET embossed film is unrolled from a first unrolling mechanism to the laminating machine, and the PET protective film is unrolled from a second unrolling mechanism to the laminating machine. The PET embossed film is output through the laminating machine and laminated and embossed with the TPU base film. On the other side, the PET protective film is also output through the laminating machine and laminated with the TPU base film to obtain a TPU composite film; the TPU composite film is pulled by the traction roll to the edge trimming machine for edge trimming, and then wound onto the cooling box for cooling and shaping; A1. The cooled and shaped TPU composite film together with the reel is transferred to the recycling machine to strip and recycle the PET embossed film; A2. The stripped and recycled PET embossed film is transferred to the first unrolling mechanism to be laminated and embossed with the next batch of TPU base films. Repeating the cycle of lamination and embossing and stripping and recycling completes the embossing and recycling.

2. The shaping and recycling process based on the recyclability of the TPU vehicle wrap base film according to claim 1, wherein When the PET embossed film output by the laminating machine laminates the TPU base film, spaced slits are left on the TPU base film.

3. The embossing recycling device based on the recyclability of the TPU vehicle wrap base film adopts the embossing recycling process described in claim 1, and is characterized in that, The recycling machine includes: A material conveying roller for outputting the TPU composite film, which is transferred from the reel in A1 to the recycling machine; Stretching rollers, including several groups, for traction and conveying the TPU composite film; A winding roller for winding the TPU composite film after separating the PET embossed film; A film stripping mechanism for separating the TPU composite film and the PET embossed film; A recycling mechanism for recycling the separated PET embossed film.

4. The embossing and recycling device based on the recyclability of the TPU vehicle wrap base film according to claim 3, characterized in that, The film stripping mechanism includes a film clamping movable member that can slide up, down, left and right for transferring the PET embossed film, a heating roller for softening the PET embossed film, and a film pushing component. On the side of the film pushing component close to the film clamping movable member, there is a clamping plate that narrows and inclines along the conveying direction, and the clamping plate is provided with a cooling end face.

5. The embossing and recycling device based on the recyclability of the TPU vehicle wrap base film according to claim 4, wherein, The film clamping movable member is provided with a scraping plate and a clamping manipulator that can grab the end corner of the PET embossed film.

6. The shaping and recycling device based on the recyclability of the TPU vehicle wrap base film according to claim 5, wherein The recycling mechanism is located below the film stripping mechanism, and is provided with a group of recycling rollers and an adsorption roller for intermittently adsorbing the PET embossed film and transferring it to the recycling rollers.

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