TPU grating printing film and preparation method thereof

Abstract

The invention discloses a TPU grating printing film and a preparation method thereof, relates to the technical field of TPU printing films, and aims to solve the technical problem of shrinkage deformation in the TPU grating film preparation process, the TPU grating printing film comprises a bottom printing layer, a middle TPU grating layer is attached to one side of the bottom printing layer, and a surface BOPET layer is arranged on one side, away from the bottom printing layer, of the middle TPU grating layer. The surface BOPET layer and the middle TPU grating layer are fixed in a heating compounding manner, and the anti-UV layer is arranged between the middle TPU grating layer and the surface BOPET layer. According to the invention, through the mutual fitting of the convex parts and the concave parts, the gap design between the concave parts and the convex parts, and the heating compounding, the processing stability is realized, the possibility of deformation is reduced, and finally, the melting extrusion mode is adopted to replace grating rolling, so that the production efficiency is improved. The problem of shrinkage deformation in the TPU grating film preparation process is further solved, the grating precision and the production efficiency are improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of TPU printing films, and more specifically to a TPU grating printing film and a preparation method thereof. Background Art

[0002] TPU printing is an evolution of modern printing technology. Its main raw material is thermoplastic polyurethane material, which has the characteristics of high strength, wear resistance, temperature resistance, flexibility, etc., while TPU grating printing film is a grating layer covered on the surface of the printing film layer. The thermal stability of TPU material is poor, and it is easy to shrink and deform during the grating rolling process, resulting in the difficulty in controlling the grating structure precision, low yield rate and high production cost. In view of this, we propose a TPU grating printing film and its preparation method. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, meet practical needs, and provide a TPU grating printing film and a preparation method thereof to solve the technical problem of shrinkage and deformation existing in the current TPU grating film preparation process.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a TPU grating printing film, comprising a bottom printing layer, an intermediate TPU grating layer attached to one side of the bottom printing layer, a surface BOPET layer arranged on the side of the intermediate TPU grating layer away from the bottom printing layer, the surface BOPET layer and the intermediate TPU grating layer are fixed by heating and compounding, and an anti-UV layer is arranged between the intermediate TPU grating layer and the surface BOPET layer.

[0005] Preferably, the anti-UV layer includes a plurality of raised portions distributed in an array, and the raised portions are arranged on the side of the middle TPU grating layer close to the surface BOPET layer by rolling. A corresponding plurality of recessed portions are arranged on one side of the plurality of raised portions, and the plurality of recessed portions are in the same position as the plurality of raised portions.

[0006] Preferably, the recessed portion is on the surface BOPET layer, and the cross-sections of the recessed portion and the raised portion are the same shape.

[0007] Preferably, a shrinkage gap is provided between the recessed portion and the raised portion before being combined.

[0008] Preferably, the raised portion and the recessed portion are semicircular in shape.

[0009] Preferred;

[0010] S1. Pre-preparation process

[0011] The surface BOPET layer is cured by UV roller calendering to form a concave prism structure and rolled up;

[0012] S2. Processing procedures

[0013] The TPU material is melt-extruded and compounded with the surface BOPET layer with a concave prism structure, and a convex prism structure corresponding to the concave prism of the surface BOPET layer is formed on the TPU layer to form an intermediate TPU grating layer, thereby achieving a 3D grating effect;

[0014] Finally, print on the bottom print layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention achieves processing stability and reduces the possibility of deformation by fitting the raised portion and the recessed portion together and designing the gap between the recessed portion and the raised portion, and then heats and compounds the recessed portion so that the size of the recessed portion is approximately larger than the raised portion, which shrinks and fits tightly with the raised portion, and achieves different grating effects by designing recessed and raised portions in different shapes. Finally, melt extrusion is used instead of grating rolling to further solve the problem of shrinkage and deformation in the preparation process of the TPU grating film, thereby improving the grating accuracy and production efficiency and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the decomposition structure in the present invention.

[0020] Explanation of the numbers in the figure: 1, bottom printing layer; 2, middle TPU grating layer; 3, surface BOPET layer; 4, anti-UV layer; 401, raised part; 402, recessed part. DETAILED DESCRIPTION

[0021] like Figures 1 to 3As shown, the present invention relates to a TPU grating printing film, comprising a bottom printing layer 1, an intermediate TPU grating layer 2 and a surface BOPET layer 3 which are arranged in sequence, the bottom printing layer 1 is preferably a BP film, the intermediate TPU grating layer 2 is melt-extruded and then attached to the bottom printing layer 1, an anti-UV layer 4 is arranged between the intermediate TPU grating layer 2 and the surface BOPET layer 3, the anti-UV layer 4 comprises a plurality of array-distributed protrusions 401, the protrusions 401 are arranged on a side of the intermediate TPU grating layer 2 close to the surface BOPET layer 3 by rolling, a plurality of corresponding recessed portions 402 are arranged on one side of the plurality of protrusions 401, the plurality of recessed portions 402 are at the same position as the plurality of protrusions 401, the recessed portions 402 are on the surface BOPET layer 3, the cross-sections of the recessed portions 402 and the protrusions 401 are the same shape, the shapes of the protrusions 401 and the recessed portions 402 are preferably semicircular, wherein the surface BOPET layer 3 and the intermediate TPU grating layer 2 are fixed by heating and compounding.

[0022] It should be noted that a shrinkage gap is provided between the recessed portion 402 and the raised portion 401 before being combined.

[0023] Working principle: through the design of heating and compounding, during the compound heating process, the film will shrink, so that the raised part 401 and the recessed part 402 are compounded to form a semicircular grating effect, wherein other shapes of raised parts 401 and recessed parts 402 can also be selected to achieve other grating effects.

[0024] A further preparation method is:

[0025] S1. Pre-preparation process

[0026] The surface BOPET layer 3 is cured by UV roller calendering to form a concave prism structure and rolled up;

[0027] S2. Processing procedures

[0028] The TPU material is melt-extruded and compounded with the surface BOPET layer 3 having a concave prism structure, and a convex prism structure corresponding to the concave prism of the surface BOPET layer 3 is formed on the TPU layer to form an intermediate TPU grating layer 2, thereby achieving a 3D grating effect;

[0029] Finally, printing is performed on the bottom printing layer 1, where the printing layer 1 is located on the side of the middle TPU grating layer 2 away from the surface BOPET layer 3;

[0030] Therefore, melt extrusion is used instead of grating rolling to further solve the shrinkage and deformation problem existing in the preparation process of TPU grating film, improve the grating accuracy and production efficiency, and reduce the production cost.

[0031] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A TPU grating printing film, characterized in that: The invention comprises a bottom printing layer (1), an intermediate TPU grating layer (2) is attached to one side of the bottom printing layer (1), a surface BOPET layer (3) is arranged on the side of the intermediate TPU grating layer (2) away from the bottom printing layer (1), the surface BOPET layer (3) and the middle TPU grating layer (2) are fixed by heating and compounding, and an anti-UV layer (4) is arranged between the intermediate TPU grating layer (2) and the surface BOPET layer (3).

2. A TPU grating printing film according to claim 1, characterized in that: The anti-UV layer (4) comprises a plurality of raised portions (401) distributed in an array, wherein the raised portions (401) are arranged on a side of the middle TPU grating layer (2) close to the surface BOPET layer (3) by rolling, and a corresponding plurality of recessed portions (402) are arranged on one side of the plurality of raised portions (401), and the plurality of recessed portions (402) are located at the same position as the plurality of raised portions (401).

3. A TPU grating printing film according to claim 2, characterized in that: The recessed portion (402) is located on the surface BOPET layer (3), and the cross-section of the recessed portion (402) and the raised portion (401) are of the same shape.

4. A TPU grating printing film according to claim 3, characterized in that: Before being combined, a shrinkage gap is provided between the recessed portion (402) and the raised portion (401).

5. A TPU grating printing film according to claim 4, characterized in that: The convex portion (401) and the concave portion (402) are in the shape of a semicircle.

6. A method for preparing the lenticular printing film according to any one of claims 1 to 5, characterized in that: include; S1. Pre-preparation process The surface BOPET layer (3) is cured by UV roller calendering to form a concave prism structure, and then rolled up; S2. Processing procedures The TPU material is melt-extruded and compounded with a surface BOPET layer (3) having a concave prism structure, and a convex prism structure corresponding to the concave prism of the surface BOPET layer (3) is formed on the TPU layer to form an intermediate TPU grating layer (2), thereby achieving a 3D grating effect; Finally, printing is performed on the bottom printing layer (1).

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