KR101728140B1 - Multi-functional film for decoration - Google Patents

Abstract

The present invention relates to a decorative composite film and, more particularly, to a decorative composite film including a hot melt layer, a PU binder layer, and a PU skin layer. A TPU layer is inserted between the PU binder layer and the hot melt layer, and the decorative composite film that has a two-layer structure (TPU layer and hot melt layer) is provided as a result. Accordingly, adhesive force, wear resistance, and thin film maintenance improvement can be achieved with respect to an attachment target. In addition, the decorative composite film that has the two-layer structure (TPU layer and hot melt layer) can be supplied at a price equal to or lower than existing decorative composite films of single-layer structure (single hot melt layer) after TPU layer thickness optimization.

Description

{MULTI-FUNCTIONAL FILM FOR DECORATION}

The present invention is an improvement of a composite film for decorative use of a conventional one-layer structure (single hot-melt layer) including a hot-melt layer, a PU binder layer and a PU skin layer, wherein a TPU layer is inserted between the hot melt layer and the PU binder layer And a two-layer structure (TPU layer and hot-melt layer).

In general, products such as shoes, bags, wallets or various pouches have fashion sense according to the fashion of the times, and various parts or ornaments are attached to the body of fabric or synthetic resin fabric by sewing and bonding.

Meanwhile, among the above-mentioned products, for example, in the case of manufacturing a shoe, a vamp and a back stay are attached to the outside of a shoe upper fabric, A conventional shoe is manufactured through a process of sewing various shapes of ornaments using an adhesive to the outside of the front reinforcement, In the case of products such as bags and wallets, the shoes are manufactured through the same process as the manufacturing process.

However, since complicated sewing lines are formed on the upper part of the shoe through the complicated step of sewing as described above, when shoes are shipped for a long period of time, dirt and dust are stuck between the seams of the sewing lines or the sewing lines, And also the manufacturing rate of the sewing machine is very high due to the number of sewing steps in the manufacturing process.

Therefore, in recent years, researches have been actively conducted on techniques for attaching various parts or ornaments to an adherend in a non-sewing manner, and related arts are Patent Documents 1 and 2.

More specifically, conventionally, as shown in FIG. 1, the PU skin layer 30 is formed by applying a PU (polyurethane) binder layer 20 on the upper surface of the hot melt layer 10 to form a decorative composite film And then adhered to an adherend such as an upper member to form various parts or ornaments on the adherend in a non-sewn manner.

However, in the case of a one-layer structure in which the PU skin layer 30 is formed on the single hot melt layer 10 as described above, the following problems occur.

First, as the solvent resistance is weak, the solvent contained in the PU binder layer 20 penetrates into the hot-melt layer 10, which results in a problem that the adhesive force with the adherend is insufficient.

Second, as the hot melt layer 10 is dried, shrinkage occurs in the PU skin layer 30 to cause various defects and deteriorate the appearance of various parts or ornaments.

Thirdly, when the single-layer structure (single hot-melt layer 10) is applied as in the prior art, wear resistance is poor, so that the PU skin layer 30 is easily damaged and the PU skin layer 30 is easily peeled. There was a problem to be solved.

Fourth, there is a problem that the hot melt layer 10 can not sufficiently penetrate into the adhering material, resulting in poor adhesion.

Fifth, when the adhering material is surface-molded to form a pattern or the like, there is a problem that the weave pattern of the adherend protrudes to the outside of the PU skin layer 30 to cause interference.

Patent Document 1: Korean Patent Registration No. 10-1328894 "Functional Tape and Manufacturing Method Thereof" Patent Document 2: Korean Patent Publication No. 10-0352144 "Hot melt adhesive, hot melt label paper manufacturing method and hot melt application device and hot melt label paper"

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to prevent the solvent of the PU binder layer from penetrating into the hot-melt layer in advance by inserting a thermoplastic polyurethane (TPU) layer between the PU binder layer and the hot- And the adhesive force to the ash can be improved.

In addition, the TPU layer prevents shrinkage of the PU skin layer to improve the aesthetic appearance of various parts or ornaments, and the wear resistance is improved by the TPU layer so that the thin film retention force can be remarkably improved. We will do it.

Another object of the present invention is to enable the hot melt layer to sufficiently penetrate into the adhering material by the TPU layer, thereby further improving the adhesive force.

Another problem is to prevent interference caused by the weave pattern of the adherend when the adherend is surface-molded to form a pattern or the like.

Particularly, the present invention optimizes the thickness of the TPU layer having the above-mentioned function, so that the two-layer structure (the TPU layer and the hot melt adhesive layer) can be formed at the same or lower cost than the conventional composite film price of the conventional single- Layer) decorative film for the decorative layer.

The present invention provides a decorative composite film comprising a hot melt layer (10), a PU binder layer (20) and a PU skin layer (30) laminated thereon, wherein a TPU layer (20) is interposed between the hot melt layer (10) and the PU binder layer 40) is formed on the surface of the decorative film (40).

Here, the TPU layer 40 preferably has a thickness of 30 to 70 탆.

In the present invention, by inserting a TPU layer between the PU binder layer and the hot-melt layer, it is possible to prevent the solvent of the PU binder layer from penetrating into the hot-melt layer in advance, thereby improving the adhesion with the adherend, The TPU layer prevents shrinkage of the PU skin layer to improve the aesthetic appearance of various parts or ornaments. In addition, the TPU layer improves the abrasion resistance and greatly improves the thin film retention, The hot melt layer is sufficiently penetrated into the adhered material by the layer so that the adhesive strength can be further improved and when the adherend is surface-molded to form a pattern or the like, interference caused by the weave pattern of the adherend is prevented, Optimizes the thickness of the TPU layer having the above-mentioned function, and thus the price of the decorative composite film of the conventional one-layer structure (single hot-melt layer) As price or low pressing force than that of a two-layer structure (TPU layer and the hot melt layer) has the effect that to supply the decorative composite film.

1 is a schematic cross-sectional view showing the structure of a conventional decorative composite film
2 is a schematic cross-sectional view showing the structure of the decorative composite film according to the present invention
Fig. 3 is a cross-sectional enlarged photograph showing the result of evaluating the solvent resistance of the decorative composite film according to the present invention
4 is a photograph showing a result of evaluation of wear resistance of the decorative composite film according to the present invention
5 is a cross-sectional enlarged view showing the result of evaluating the retention of the thin film of the decorative composite film according to the present invention
6 is a cross-sectional enlarged view showing the results of the coherence evaluation on the pattern of the woven fabric of the decorative composite film according to the present invention
7 is a photograph showing a result of evaluating shrinkage prevention property of the decorative composite film according to the present invention

In order to achieve the above effect, the present invention relates to a decorative composite film. In the drawings and the detailed description thereof, elements and operations which are easily understood by those skilled in the art and which are not directly related to the technical characteristics of the present invention The detailed description and the detailed description of the technical structure and operation of the apparatus are omitted or simplified.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2, the present invention provides a decorative composite film comprising a hot melt layer 10, a PU binder layer 20 and a PU skin layer 30 laminated, wherein the hot melt layer 10 and the PU binder layer And the TPU layer (40) is formed between the substrate (20).

Here, the PU binder layer 20 may be formed using a solvent such as methylethylketone, ethylacetate, cyclohexane, acetone, isopropylalcohol, methylcyclohexane, The PU skin layer 30 is formed by applying a conventional PU binder comprising a mixture of polyurethane and toluene or dimethylformamide and polyurethane. The PU skin layer 30 is made of polyurethane And is applied or spread by a conventional wet or dry method, or separately packed or adhered. This is variously disclosed and disclosed in Korean Patent Publication No. 10-1354945 and is a usual structure layer constituting a decorative composite film A detailed description thereof will be omitted. In addition, the PU binder layer 20 and the PU skin layer 30 may have various thicknesses, materials, and methods well known in the art depending on the purpose, use environment, and the like of the decorative composite film. It is not limited to materials and methods.

The hot melt layer 10 is an adhesive medium between an adherend and a decorative composite film. This hot melt layer 10 is also known in the art and may be a polyester resin, a polyurethane resin, an acrylic resin, a polyamide resin, an ethylene vinyl acetate resin or a polyolefin resin But it is not limited thereto. Various well-known hot melt materials can be applied depending on the intended use and purpose of the decorative composite film, the use environment, and the like. In addition, the thickness of the hot melt layer 10 is usually 110 to 220 탆. However, the thickness of the hot melt layer 10 is not limited thereto. The thickness and thickness of the TPU layer 40 It is possible to apply various thicknesses depending on the shape,

That is, the present invention relates to a general decorative composite film in which the hot melt layer 10, the PU binder layer 20 and the PU skin layer 30 are laminated as described above, wherein the hot melt layer 10 and the PU binder layer And the TPU layer (40) is formed between the substrate (20).

Therefore, the TPU layer 40 can prevent the solvent of the PU binder layer 20 from penetrating into the hot-melt layer 10 in advance, thereby improving the adhesive force with the adherend, The TPU layer 40 prevents the PU skin layer 30 from being shrunk to improve the aesthetic appearance of various parts or ornaments and the wear resistance is improved by the TPU layer 40, The hot melt layer 10 can be sufficiently penetrated into the adherend by the TPU layer 40 to further improve the adhesive force. Further, the adherend can be surface-molded to form a pattern or the like (The weave pattern of the adherend does not protrude outside the PU skin layer 30) due to the weave pattern of the adhering material.

On the other hand, according to the present invention, by optimizing the thickness of the TPU layer 40 having the functions as described above, the two-layer structure (TPU) can be produced at a price equal to or lower than the conventional composite film price of the conventional single- Layer and a hot-melt layer).

For this, the TPU layer 40 of the present invention preferably has a thickness of 30 to 70 탆, and when the thickness of the TPU layer 40 is less than 30 탆, the above-mentioned effects and functions may not be realized sufficiently If it exceeds 70 μm, the cost of the decorative composite film may increase.

The thickness of the TPU layer 40 is preferably 30 to 70 mu m and the thickness of the hot melt layer 10 is preferably 110 to 220 mu m so that the TPU layer 40 and the hot- May be in the range of 140 to 290 탆, but it is preferable that the total thickness is set in the range of 180 to 250 탆 in consideration of the use efficiency and effect realization efficiency.

Hereinafter, the effect of inserting the TPU layer 40 is demonstrated as follows. The embodiment according to the present invention has a hot-melt layer 10 having a thickness of 162 탆, a PU binder layer 20 having a thickness of 44.1 탆, The TPU layer 40 having a thickness of 30 mu m, the TPU layer 40 having a thickness of 58.2 mu m and the TPU layer 40 having a thickness of 70 mu m (A two-layer structure (TPU layer and hot melt layer)) made of a hot melt layer 10 having a thickness of 206.1 占 퐉 (198 占 퐉 in the case of a thin film retention test at each temperature), a thickness of 67.6 占 퐉 (One-layer structure (single hot-melt layer)) in which a PU binder layer 20 and a PU skin layer 30 having a thickness of 39.3 mu m were laminated.

1. Solvent resistance

As shown in Fig. 3 (enlarged image 300 times in cross section), it can be seen that the solvent of the PU binder layer 20 penetrated into the hot-melt layer 10 in the comparative example. However, It can be seen that as the TPU layer 40 is further inserted, the TPU layer 40 acts as a protective substrate for the solvent so that the solvent of the PU binder layer 20 is not penetrated into the hot-melt layer 10 . That is, the decorative composite film according to the present invention has excellent solvent resistance as compared with the conventional decorative composite film.

2. Abrasion resistance

As a result of testing the abrasion resistance based on the ASTM D 3886 test standard, as shown in FIG. 4, in the case of the comparative example, damage was already generated at 30 cycles, whereas in the case of Examples 1 to 3, the TPU layer 40 was further inserted It can be seen that some damage (less than the damage in 30cycles of the comparative example) occurs only after 80cycles have been reached. That is, the decorative composite film according to the present invention is at least 2.6 times more abrasive than conventional decorative composite films.

3. Thin film retention by temperature

As shown in FIG. 5 (enlarged image 300 times in cross section), it can be seen that the hot-melt layer penetrates deeper into the fabric than the comparative example in Examples 1 to 3, , Which is judged to be due to the TPU layer formed in Examples 1 to 3.

4. Adhesiveness

The decorative composite films according to Examples 1 to 3 and Comparative Examples were applied to suede leather (Suede) and mesh fabric (MESH) (pressure was applied for 25 seconds at a temperature of 140 캜 under a pressure of 50 kg / cm 2) (Instron 5565, Instron), and the results are shown in Table 1 below. In this case, two kinds of colors were used for the leather and fabric in black and white, and the specimen was 25.4 x 152 mm.

division color Adhesion (kg / cm) min Comparative Example + Suede
black 6.3 6.3 6.1 5.9 6.0 5.9 White 6.4 6.1 6.1 6.5 6.5 6.1 Comparative Example + Mesh
black 3.3 3.6 3.4 3.3 3.8 3.3 White 3.0 3.0 3.0 3.5 3.6 3.0 Example 1 + Suede
black 6.4 6.4 6.2 6.2 6.0 6.0 White 6.0 5.9 6.0 6.0 5.9 5.8 Example 1 + mesh black 3.4 3.3 3.3 3.6 3.5 3.2 White 4.6 4.4 4.5 4.6 4.7 4.3 Example 2 + Suede
black 6.4 6.4 6.3 6.3 6.0 6.0 White 5.9 5.8 5.9 6.0 5.8 5.8 Example 2 + mesh
black 3.3 3.2 3.3 3.5 3.4 3.2 White 4.5 4.3 4.4 4.5 4.6 4.3 Example 3 + Suede
black 6.5 6.5 6.4 6.3 6.0 6.0 White 5.9 5.9 5.9 6.0 5.9 5.8 Example 3 + mesh
black 3.4 3.2 3.4 3.5 3.5 3.2 White 4.6 4.3 4.4 4.6 4.6 4.3

As shown in Table 1, the decorative composite film according to Examples 1 to 3 of the present invention shows excellent adhesion regardless of the type of the adhering material by the TPU layer 40.

5. Coherence to the pattern of woven fabric

The decorative composite film according to Examples 1 to 3 and Comparative Example was applied to a mesh fabric (MESH) having a weave pattern (pressure was applied for 25 seconds at a temperature of 140 ° C under a pressure of 50 kg / cm 2) , The film surface is irregularly protruded by a weave pattern of the material to be adhered in the case of the comparative example, as shown in Fig. 6 (enlarged image 300 times in cross section) In the case of Examples 1 to 3 according to the invention, it can be seen that the film surface is uniform and beautiful, and thus the film surface is not affected by the weaving pattern of the adherend fabric.

6. Contraction prevention

As shown in FIG. 7, the decorative composite film according to the present invention has shrinkage-preventing properties as compared with the comparative example as the TPU layer 40 is further inserted. It can be seen that it is excellent.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It can be understood that it is possible.

10: hot melt layer 20: PU binder layer
30: PU skin layer 40: TPU layer

Claims (4)

(EN) A decorative composite film comprising a hot melt layer (10), a polyurethane (PU) binder layer (20) and a PU skin layer (30) laminated on one another, characterized in that the hot melt layer (10) and the PU binder layer polyurethane layer 40 is formed,
The TPU layer 40 has a thickness of 30 to 70 mu m,
The hot-melt layer 10 may be used alone or in combination of two or more of polyester resin, polyurethane resin, acrylic resin, polyamide resin, ethylene vinyl acetate resin or polyolefin resin, Go,
Wherein the total thickness of the hot melt layer (10) and the TPU layer (40) is 180 to 250 占 퐉. delete delete delete

Images