JPH0585673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for molding synthetic leather suitable for adding a shading pattern.

[Conventional technology]

The surface of synthetic leather is sometimes given a textured pattern called Shibo to give it a luxurious feel. These uneven patterns are added during the synthetic leather manufacturing process described below.

FIG. 4 shows a schematic diagram of the synthetic leather manufacturing process. As shown in the figure, a release paper 1 wound into a roll is continuously fed out, and a resin 5 (for example, polyurethane resin) for forming synthetic leather is coated with a uniform thickness by a knife 3 on a roller 2. be done. When the release paper 1 passes through the heater 7, the resin layer 5a formed on the release paper 1 is dried and hardened. The release paper 1 is further fed, and an adhesive 8 (for example, a polyurethane adhesive) is applied onto the resin layer 5a by a knife 11 on a roller 10. On the other hand, a base fabric 12 (for example, woven fabric, non-woven fabric, foamed polyurethane fabric, etc.) wound into a roll is continuously supplied and adhered to the adhesive layer 8a of the release paper 1 by a pressure roller 13. When the release paper 1 and the base fabric 12 pass through the heater 15, the adhesive layer 8a is dried and hardened, and the resin layer 5a is firmly adhered to the base fabric 12 via the adhesive layer 8a.
Next, while peeling off the release paper 1 at the position where it exits the opposing roller 16, the base fabric 12, adhesive layer 8a, and resin layer 5 are removed.
synthetic leather sheet 17 consisting of a, and release paper 1
Each is wound up into a roll.

When creating an uneven pattern, as shown in FIG. 5, when an uneven pattern 1b is formed by embossing on the release paper 1, the resin layer 5a follows the uneven pattern 1b to form an uneven pattern 5b. While being in close contact with each other in this way, the resin layer 5a is heated by the heater 7 to dry and harden.
The unevenness 5b of the synthetic leather is maintained.

In contrast to such uneven patterns (three-dimensional patterns), colored patterns have been added by methods such as textile printing or mixing pigments into the resin 5.

[Problem that the invention seeks to solve]

Among color patterns, so-called blurred patterns in which the shading gradually changes are difficult to produce using the above-mentioned textile printing methods. Furthermore, conventionally, colored patterns had to be created in a completely separate process from the uneven patterns.

The present invention has been made in view of the above-mentioned conventional technology, and provides a synthetic leather molding method that is optimal for adding a shading pattern and also allows the shading pattern to be added at the same time as the uneven pattern.

[Means for solving problems]

A synthetic leather molding method to which the present invention is applied to solve the above problems will be explained with reference to FIG. 1 corresponding to an embodiment. As shown in the figure, in the synthetic leather molding method of the present invention, as the roller 2 rotates, the roller 2
A resin layer 5a is formed on one side 1A of the release paper 1 that moves on the surface of the base fabric 12 (the fourth
In the synthetic leather forming method in which the release paper 1 is peeled off after bonding to the synthetic leather (see figure), the one side 1A of the release paper 1 is
On the surface 1B opposite to the roller 2 side, the unevenness 6 constituting the pattern is brought into contact.

[Effect]

While the unevenness 6 of the roller 2 is in contact with the release paper 1, the release paper 1 has an unevenness 1c, and the resin layer 5a is formed along the unevenness 5c. The roller 2 rotates and the unevenness 6 becomes the release paper 1.
When separated from the release paper 1, the unevenness 1c of the release paper 1 stretches and becomes flat, and the unevenness 5c of the resin layer 5a also gradually becomes flat. At this time, thickness unevenness occurs in the resin layer 5a centering around the unevenness 5c. Next, the resin layer 5a is heated by the heater 7, and the resin layer 5a is dried and hardened while the thickness unevenness is flattened but still remains. After the resin layer 5a is bonded to the base fabric 12, the release paper 1 is peeled off to complete synthetic leather. Due to the uneven thickness of the resin layer 5a, the resulting synthetic leather has a shading pattern.

〔Example〕

Examples of the present invention will be described in detail below.

FIG. 1 shows the main part of an embodiment of a synthetic leather molding method to which the present invention is applied.

As shown in FIG. 1, a convex portion 6 is formed on the surface of the roller 2. As shown in FIG. Note that the convex portion 6 may be a concave portion or an uneven portion as desired. The release paper 1 moves as the roller 2 rotates, hits the roller 2, and is pushed by the convex portion 6 to form a concave portion 1c. A resin 5 is applied to one side 1A of the release paper 1 using a knife 3.
The resulting resin layer 5a has recesses 5c along the recesses 1c of the release paper 1. The roller 2 rotates and the convex portion 6
When separated from the release paper 1, the recesses 1c of the release paper 1 stretch due to tension, and the recesses 5c of the resin layer 5a gradually become flat with a slight delay due to viscosity. The thickness may become uneven. When the resin layer 5a is heated by the heater 7,
Even though it is flattened, it dries and hardens with uneven thickness.

The subsequent steps are shown in a schematic diagram in FIG. 4 and have already been explained, so the explanation will not be repeated again, but by adopting the same steps, synthetic leather with a shading pattern can be obtained.

FIG. 2 shows another embodiment, in which the surface of the roller 2 is not uneven, but an uneven object 9 such as a net or coarse cloth is sandwiched between the roller 2 and the release paper 1. . Other than that, a shading pattern can be applied to the synthetic leather in the same manner as in the embodiment shown in FIG. In the example shown in FIG. 2, if it is desired to add a pattern to only a part of the long synthetic leather sheet, it is sufficient to insert the uneven material 9 only in the necessary part. Further, the pattern can be easily changed by simply changing the intervening uneven object 9.

FIG. 3 also shows another embodiment, in which embossed projections and depressions 1b are formed on the release paper 1, and projections and depressions 6 are formed on the surface of the roller 2, respectively. In this way,
The resin layer 5a has projections and depressions 5b formed in the same manner as the projections and depressions 1b. On the other hand, unevenness 1c is formed on the release paper 1 following the unevenness 6, and unevenness 5c is also formed on the resin layer 5a following the unevenness 1c. The unevenness 5c has an uneven thickness as explained in the example of FIG. As a result, the synthetic leather has both uneven and blurred patterns.

Embossed unevenness 1b is formed on release paper 1,
Keep the surface of roller 2 flat and separate roller 2 and release paper 1.
If an uneven object 9 is inserted between the two (see Fig. 2),
As in the example shown in FIG. 3 above, both an uneven pattern and a shading pattern can be added to the synthetic leather.

Note that the above-mentioned synthetic leather is not limited to synthetic leather in a narrow sense, but also includes so-called stiff leather such as vinyl leather.

〔Effect of the invention〕

As explained above, according to the synthetic leather molding method to which the present invention is applied, it is now possible to easily create a shading pattern that is difficult to create using conventional printing methods that create colored patterns. In addition, conventionally, the patterning by printing was done in a completely separate process from the uneven pattern, but the method of the present invention makes it possible to add different patterns in one process, which saves labor. Become. In addition, it is easy to add a pattern to the synthetic leather while it is being formed, change the pattern, or stop adding the pattern, making it suitable for a wide variety of production.

[Brief explanation of the drawing]

Figure 1 shows the main part of an embodiment of the synthetic leather molding method to which the present invention is applied, Figures 2 and 3 show the main part of another embodiment, and Figure 4 shows the main part of the synthetic leather molding method. FIG. 5, which is a schematic diagram of the manufacturing process, shows the main parts of a conventional synthetic leather molding method. DESCRIPTION OF SYMBOLS 1... Release paper, 2.10... Roller, 3.11... Knife, 5... Resin, 5a... Resin layer, 7.15... Heater, 8... Adhesive, 8a... Adhesive layer, 12... Base fabric,
13... Pressure roller, 16... Opposing roller, 17... Synthetic leather sheet, 1b, 1c, 5b, 5c, 6, 9
...Unevenness.

Claims (1)

[Claims] 1. A synthetic leather molding method in which a resin layer is formed on one side of a release paper that moves on the surface of the roller as the roller rotates, and after the resin layer is bonded to a base fabric, the release paper is peeled off. 1. A method for forming synthetic leather, which comprises bringing a pattern-forming unevenness into contact with one surface of a release paper opposite to the one surface from the roller side.