JPS6399914A - Leatherlike molding - Google Patents

Abstract

PURPOSE:To obtain a leatherlike product which is free from peeling-off or creases, by performing molding by heating and turning a mold by loading dried leather powder and thermoplastic resin compound of a specific grain size into the mold. CONSTITUTION:Leather powder 2 of 50-250 meshes where mainly a collagen fiber is made into a powdery state is mixed into thermsplastic resin 1. A thing obtained by crushing scrap leather dried until remaining water content comes to 3% or lower is used as the leather powder 2. A thermoplastic resin compound composed of the thermoplastic resin 1, a filler, a pigment, a plasticizer and a heating catalyst, which have been made into a powdery state, and the leather powder 2 are mixed up with each other at a weight ratio of 30-70% each. Those are loaded into a mold 3 by mixing them up with one another and the thermoplastic resin compound is stuck close to the inside of the mold 3 by melting the same by heating and turning the mold 3. A leatherlike molding A is obtained by taking out the thermoplastic resin compound through the inside of the mold 3 after cooling.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is formed into a hollow shape, has an appearance and feel similar to leather, does not undergo deformation due to expansion/contraction or distortion when wet or dry, and has excellent abrasion resistance. The present invention relates to leather-like molded products that are ideal for hollow furniture such as chair seats and armrests, materials for fittings, and play equipment such as dolls and balls.

(Prior Art) Conventionally, the armrests, seats, etc. of chairs have been made of plastic or the like and have leather covered on the outside to give them a luxurious feel and give the surface a unique feel of leather.

In addition, for toys, especially dolls, heads, bodies, etc., which are molded into two molds made of vinyl chloride resin or the like by injection molding and then joined together, have been used.

(Problems to be solved by the invention) However, it requires skill and effort to upholster leather like the above-mentioned chairs, etc., and since leather is expensive, the product costs are high. Because of this, the product became larger and thicker than necessary.

However, the skin and the main body have different expansion and contraction ratios, so they tend to get loose.
Also, it did not blend well with adhesives, was easily peeled off due to moisture, and depending on the shape, seams were unavoidable, and the skin was not thick enough to completely eliminate the feel of the main body. or,
The swelling and drying of the skin caused wrinkles, which did not return to their original state and caused a poor appearance, and the shrinkage of the skin caused gaps to appear at the edges of the upholstery. In addition, damage caused by insects and rats, stains caused by mold,
There were many problems, such as the occurrence of shims that penetrated into the interior due to water exposure.

In addition, the joint of the two molds was visible in the head of the doll, which looked unnatural, and the feel was different from that of the skin.

(Means for Solving the Problems) The present invention has been provided in view of the above circumstances, and includes five
A hollow leather-like molded product A is formed by putting 0 to 250 mesh dry leather powder 2 and powdered thermoplastic resin compound into a mold 3, and heating and rotating the linear mold 3. Since the leather-like material is not laminated but integrally formed, it is possible to provide a leather-like product A that does not peel or wrinkle.

(Example) An example of the leather-like molded product A according to the present invention will be described below with reference to the drawings.

Reference numeral 1 is a thermoplastic resin such as reinforced vinyl, and the thermoplastic resin 1 is mixed with leather powder 2 in which 50 to 250 meshes of mainly collagen fibrin are powdered. Crushed waste skin or leather sanding powder that has been dried until it has a content of 3% or less is used.
In particular, tannin- and chromium-treated leather powder has anti-rot properties. ) The size of the mesh is especially important because if the mesh is too small or too large, it will not be scattered in the resin compound during mixing and will become lump-like.

In addition, thermoplastic resin powder consisting of powdered thermoplastic resin 1, fillers, pigments, plasticizers, thermal catalysts, etc. is mixed at a weight ratio of 30 to 70%, and leather powder 2 is mixed at a weight ratio of 30 to 70%. In addition, when 3 to 30% of powdered industrial gelatin is mixed with the thermoplastic resin powder, when a small amount of pigment is mixed, there are cases where leather powder is pre-dyed or bleached. , these are mixed and put into the mold 3, and the mold 3 is heated and rotated. As shown in FIG. 1, the thermoplastic resin compound melts and adheres to the inner surface of the mold 3. After cooling, the mold 3 By taking it out from the inside, a leather-like molded article A as shown in FIG. 2 is obtained.

The thermoplastic resin 1 mixed with the leather powder 2 has good shape release due to the colloidal formation of protein, which is the main component of the leather powder 2, at high temperatures, and has a glossy and dense surface.

Industrial gelatin is used as a lubricant and filler, and is a transparent protein that improves lubricity and prevents adhesion (adhesion).
This is to increase the properties of foam, foam, and water retention.

In addition, the molded surface is subjected to necessary treatments depending on the molded product, such as sanding, coloring by applying pigments, dyes, etc., surface cosmetic treatment, pore-like perforation, graining, suede-like raising, etc. Possibly the desired leather-like molded article A
This is what is said to be.

(Actions and Effects) The leather-like molded article according to the present invention is configured as described above.

Contains leather powder mainly composed of protein-based collagen fibrin, so it blends easily into the skin like leather, has moderate contact resistance due to its moderate moisturizing properties, and has hygroscopic properties that absorb sweat. It has a feel similar to leather, has a glossy surface, and can be applied with surface makeup and care in the same way as leather.
Furthermore, while it is hydrophilic, it is also water resistant.

2 The fiber structure of the leather is broken as a leather powder and mixed into the thermoplastic resin compound, so it does not stretch, distort, warp, etc. like leather, and also prevents brittleness due to drying and wetness, Due to the discontinuous structure caused by the powdering of the leather and the barrier caused by the surface coating of the leather powder with resin, the swelling does not reach the deep part of the sheet and is limited to only the surface layer, so that excessive swelling does not occur.

Furthermore, it is reliably molded from thermoplastic resin material and has excellent shape retention.

3. The thermoplastic resin forms a membrane around the leather powder and forms a soft part, so the leather powder is protected by this soft part, and since the leather powder is a protein and has restoring power, it returns to its original state even if it is pressed. Good surface wear resistance.

4 Unlike the conventional metal body covered with leather,
Since it is molded from the leather-like material itself, it is a one-piece leather-like material even inside, so the surface will not peel off, and even large products are molded in one shot, so there are no seams.
It also has a good touch feel, without making you feel the body when you touch it with the surface, as you would with a conventional one that is pasted onto the main body.Also, there is no wrinkles on the surface due to swelling and drying, and it is made of thermoplastic resin. Since it is covered with leather powder, there will be no deep stains due to water exposure, and there will be no damage from insects or rats.

5. When performing rotary molding, the slipperiness of the leather powder, which is mainly composed of proteins and lipids, allows it to mix well with the thermoplastic resin compound, and the protein in the leather powder turns into a colloid at high temperatures, allowing for good mold release. It is glossy and dense, and due to rotational molding, there are no seams in the molded product, and as mentioned above, there is no swelling, so there is no expansion or contraction, and the dimensions are stable.The feel is close to the skin, making it ideal for furniture, etc. However, it is seamless and beautiful with the appearance and feel of skin that is more like a doll.The hollow product is cheap and can be made continuously using inexpensive molds, and leather powder can also be used as a raw material, so it can be provided at a low price. can.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the method for forming a leather-like molded product according to the present invention, FIG. 2 is a cross-sectional view of the leather-like molded product, and FIG.
The figure is a partially enlarged sectional view. A...Leather-like molded product, l...Thermoplastic resin, 2...
・Leather powder.

Claims (1)

[Claims] 1. A hollow leather-like molded article, characterized in that it is formed by placing dry leather powder of 50 to 250 mesh and a thermoplastic resin compound into a mold, and heating and rotating the mold.