Pressed recycling equipment and process based on the recyclability of TPU car cover base film

Abstract

The present invention discloses a forming and recycling device and process based on the recyclability of TPU car cover base film, which belongs to the technical field of TPU car cover base film. The recycling machine includes: a feeding roller, which is used to output the TPU composite film and transfer it from the roll in A1 to a recycling machine; a drafting roller, including several groups, which is used to pull and convey the TPU composite film; a winding roller, which is used to wind up the TPU composite film after separating the PET embossed film; a film tearing mechanism, which is used to separate the TPU composite film and the PET embossed film; a recycling mechanism, which is used to recycle the separated PET embossed film. The present application performs film forming on the TPU base film by laminating the PET embossed film with a embossed texture, replacing the traditional hot pressing roller forming, and improving the forming process to improve the texture integrity and yield rate of the TPU base film after forming; the present application designs a film tearing mechanism and a recycling mechanism to tear and recycle the PET embossed film of the TPU composite film, thereby improving the utilization rate of raw materials and promoting recycling, and reducing the cost of the forming process.

Description

Technical Field

[0001] The present invention discloses TPU car cover base film technology, and in particular relates to a press-forming recycling device and 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 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 and dot patterns, 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 maintain the shape for at least one day; when the embossing step is carried out by this method, the hot pressing roller continuously embosses the TPU cast film. Due to the high viscosity of the TPU cast film, the TPU cast film adheres to the embossing on the hot pressing roller. The high viscosity makes it 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 problems and provide a compression recycling device and process based on the recyclability of TPU car cover base film.

[0005] To achieve the above-mentioned purpose, 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, and is attached to the casting roller by the air knife to be pre-cooled and formed into a film, and then passes through multiple sets of traction rollers to induce stretching and traction to form a TPU base film;

[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 by a pulling roller to the trimming machine for trimming, and then rewound to the 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] A2, the PET embossed film recovered by tearing off the film is transferred to a reeling mechanism for laminating and embossing the next batch of TPU base film. The laminating, embossing and tearing off film recycling cycles are repeated to complete the embossed recycling.

[0010] Preferably, when the PET embossed film output by the laminating machine is laminated on the TPU base film, a spaced tear is left on the TPU base film.

[0011] As a preferred embodiment, a compression recycling device based on the recyclability of the TPU car cover base film adopts the compression recycling process, and the recycling machine includes:

[0012] Feed roller, used to output TPU composite film, transferred from the roll in A1 to the recycling machine;

[0013] Drafting rollers, including several groups, are used to traction and convey the TPU composite film;

[0014] Winding roller, used for winding up the TPU composite film after separating the PET embossed film;

[0015] Film tearing mechanism, used to separate TPU composite film and 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 and down, left and right for transferring the PET embossed film, a heating roller for softening the PET embossed film, and a top film assembly. The top film assembly is provided with a clamping plate that narrows and tilts along the conveying direction on the side close to the film clamping movable part, and the clamping plate is provided with a cooling end surface.

[0018] Preferably, the film clamping movable part is provided with a scraper and a clamping robot capable of grabbing 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 that intermittently adsorbs the PET embossed film and transfers it to the recycling roller.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] First, the present application uses a PET embossed film with embossed patterns to coat and emboss the TPU base film, replacing the traditional hot pressing roller embossing. This overcomes the problem that due to the high viscosity of the TPU cast film on the traditional hot pressing roller, the TPU cast film is easily deformed due to excessive adhesion to the hot pressing roller when attached to the hot pressing roller, and cannot be accurately embossed into a complete structure on the TPU cast film, resulting in a high deformation rate of the patterns after embossing and a low yield rate. The improved embossing process improves the pattern integrity and yield rate of the TPU base film after embossing.

[0022] Secondly, 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, thereby improving the utilization rate of raw materials while promoting recycling and reducing the cost of the embossing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a simplified diagram of the pressing process flow of the pressing recycling equipment based on the recyclability of TPU car cover base film;

[0024] Figure 2 Schematic diagram of the structure of the compression recycling equipment based on the recyclability of TPU car cover base film Figure 1 ;

[0025] Figure 3 Schematic diagram of the structure of the compression recycling equipment based on the recyclability of TPU car cover base film Figure 2 .

[0026] Figure numerals: 1. Feed roller; 2. Film tearing mechanism; 3. Recovery mechanism; 4. Drafting roller; 5. Winding roller; 6. Film clamping movable part; 7. Heating roller; 8. Top film assembly; 9. Clamping plate; 10. Scraper; 11. Clamping robot; 12. Adsorption roller; 13. Recovery roller; 14. First unwinding mechanism; 15. Mould; 16. Laminating machine; 17. Second unwinding mechanism; 18. Trimming machine; 19. Cooling box. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below 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 terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, the compression recycling process based on the recyclability of TPU car cover base film includes the following steps:

[0029] S1, after being extruded from the extruder, the cast film flows out through the die 15 and is attached to the cast roller by the air knife for pre-cooling to form a film, and then passes through multiple sets of traction rollers for induction stretching to form a TPU base film; the temperature of the cast film during pre-cooling is set at 25-30°C, so that the TPU base film is not completely cooled and has a certain degree of adhesion and plasticity, which is convenient for subsequent lamination and embossing of the PET embossed film;

[0030] S2, the PET embossed film is unwound by the first unwinding mechanism 14 to the laminating machine 16, and the PET protective film is unwound by the second unwinding mechanism 17 to the laminating machine 16. The PET embossed film is output by the laminating machine 16 and laminated with the TPU base film for embossing. The PET protective film on the other side is also output by 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 is laminated on the TPU base film, a spacer tear is left on the TPU base film. The spacer tear is caused by the interval pause of the laminating machine 16 when laminating the TPU base film, so that the PET embossed film on the TPU composite film is not completely covered, leaving a spacer tear that is easy to tear off, so that the subsequent film tearing mechanism 2 and the recycling mechanism 3 can tear and recycle the film; The TPU composite film is pulled to the trimming machine 18 via the traction roller for trimming, and then rolled into the cooling box 19 for cooling and shaping. The cooling air can be blown to the TPU composite film through the air ring structure in the cooling box 19 to take away the heat, so that the PET embossed film in the TPU composite film can be quickly cooled and shaped after being pressed against the TPU base film to form a complete pressing on the TPU base film. At the same time, the inner wall of the reel for rolling up the TPU composite film in the cooling box 19 can be set as a cooling core rod to synchronously cool the TPU composite film from the inside to the outside to prevent shrinkage caused by uneven cooling rates on both sides of the TPU composite film, thereby improving the cooling and shaping integrity yield of the TPU composite film; multiple groups of reels can be set in the cooling box 19 for switching, and group cooling is performed after rolling up to improve the cooling and shaping efficiency.

[0031] A1, after cooling and shaping, the TPU composite film is transferred to the recycling machine together with the roll to tear off the PET embossed film for recycling; based on the recyclability of TPU car cover base film, the recycling machine includes:

[0032] Feed roller 1 is used to output the TPU composite film and transfer the cooled and shaped TPU composite film to the recycling machine;

[0033] Drafting rollers 4, including several groups, are used to traction and convey the TPU composite film;

[0034] Winding roller 5, used for winding up the TPU composite film after separating the PET embossed film;

[0035] Film tearing mechanism 2, used for separating TPU composite film and PET embossed film;

[0036] The film tearing mechanism 2 includes a film clamping movable part 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 top film assembly 8. The top film assembly 8 is provided with a clamping plate 9 that narrows and tilts along the conveying direction on the side close to the film clamping movable part 6. The clamping plate 9 is provided with a cooling end surface, and the cooling end surface is cooled by circulating water cooling.

[0037] The film clamping movable part 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 a suction roller 12 that intermittently absorbs the PET embossed film and transfers it to the recycling roller 13;

[0040] like Figure 2-Figure 3 As shown, the film tearing mechanism 2 and the recycling mechanism 3 operate to tear and recycle the PET embossed film as follows:

[0041] The cooled and shaped TPU composite film transferred to the recycling machine is output from the feeding roller 1 and is pulled and conveyed by multiple sets of drafting rollers 4. When the TPU composite film is conveyed through 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 top film assembly 8. As the TPU composite film approaches the clamping plate 9 of the top film assembly 8, the TPU composite film on the side close to the PET protective film is cooled, resulting in a temperature difference with the TPU composite film on the other side, which reduces the adhesion between the PET embossed film and the TPU base film. When the TPU composite film approaches the narrowed and inclined clamping plate 9, the PET embossed film is separated from the TPU base film along the interval tear.

[0042] At this time, the scraper 10 of the film clamping movable part 6 lifts up the separated PET embossed film, and the end corner of the PET embossed film is clamped and grabbed by the clamping manipulator 11. The PET embossed film moves along with the film clamping movable part 6 to the suction roller 12 of the recovery mechanism 3 below. The suction roller 12 absorbs the PET embossed film through the vacuum pump and rotates to the recovery roller 13 below. The suction roller 12 releases the adsorption of the PET embossed film, and the continuously rotating recovery roller 13 rewinds the PET embossed film for recovery.

[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 interval tearing, and can control the start and stop of the TPU composite film conveying, the clamping activity of the film clamping movable part 6 on the PET embossed film and the start and stop of the adsorption of the adsorption roller 12 after transmitting the visual image data to the industrial control computer for processing.

[0044] A2, the PET embossed film recovered by tearing off the film is transferred to the laminating machine 16 for laminating and embossing the next batch of TPU base film, and the laminating and embossing and tearing off film recovery cycles are repeated to complete the embossing recovery.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

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

Claims

1. The compression recycling process based on the recyclability of TPU car cover base film is characterized by: The following steps are involved: S1, the cast film is extruded from the extruder, flows out through the die, and is attached to the casting roller by the air knife to be pre-cooled and formed into a film, and then passes through multiple sets of traction rollers to induce stretching and traction to form a TPU base film; 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 by a pulling roller to the trimming machine for trimming, and then rewound to the cooling box for cooling and shaping. 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; A2, the PET embossed film recovered by tearing off the film is transferred to a reeling mechanism for laminating and embossing the next batch of TPU base film. The laminating, embossing and tearing off cycles are repeated to complete the embossed recycling; When the PET embossed film output by the laminating machine is laminated on the TPU base film, a spaced tear is left on the TPU base film; Based on the recyclability of TPU car cover base film, the compression recycling equipment adopts the compression recycling process. The recycling machine includes: Feed roller, used to output TPU composite film, transferred from the roll in A1 to the recycling machine; Drafting rollers, including several groups, are used to traction and convey the TPU composite film; Winding roller, used for winding up the TPU composite film after separating the PET embossed film; Film tearing mechanism, used to separate TPU composite film and PET embossed film; A recycling mechanism for recycling the separated PET embossed film; The film tearing mechanism includes a film clamping movable part that can slide up and down and left and right for transferring the PET embossed film, a heating roller for softening the PET embossed film, and a top film assembly. The top film assembly is provided with a clamping plate that narrows and tilts along the conveying direction on one side close to the film clamping movable part, and the clamping plate is provided with a cooling end surface; The film clamping movable part is provided with a scraper and a clamping manipulator capable of grabbing the end corners of the PET embossed film; The recycling mechanism is located below the film tearing mechanism and is provided with a group of recycling rollers and an adsorption roller that intermittently adsorbs the PET embossed film and transfers it to the recycling roller.

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