JPS6128326B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a novel shoe core that can utilize paper fiber products such as waste paper, such as used cardboard and old newspapers, and chemical fiber products, such as fallen hair and shearing waste obtained at chemical fiber factories, as raw materials. Concerning the manufacturing method of wood. More specifically, the present invention aims to manufacture a shoe insert material that has water resistance, peeling resistance, bending resistance, and bending resistance that are generally required for shoe insert materials using inexpensive raw materials. It is about the method. Currently, there are products that are widely available on the market that are made by a certain company and are called made from impregnated pulp board or impregnated non-woven fabric board, but these are all made by impregnating ordinary pulp or non-woven fabric with water-resistant resin. The material is pressed and cut, and it is still found to be insufficient in terms of peel strength, folding durability, and water resistance. As mentioned above, used paper fiber products and chemical fiber products can be used for the inner material of shoes manufactured by the method of the present invention, so as a natural result, the manufacturing cost is low, and the resulting product is As will be described later, its performance is comparable to that of commercially available products. To explain the manufacturing method of the present invention, first, the first step is to disperse appropriate amounts of paper fiber products and chemical fiber products in water in a manner similar to paper making to form a substantially uniform fluid state; The second step is to drain the material using a press or other means to reduce the water content to about 50% by weight, then punch it (through a needle) to entangle the fibers, and impregnate the material with a water-resistant resin emulsion. The present invention relates to a method of manufacturing a shoe midsole material, which comprises a third step of drying the insulating material using a hot press and cutting it into an appropriate shape. The paper fiber products and chemical fiber products used in the first step mentioned above can be suitably used once used waste products, and based on the fact that the amount of both is approximately equal in weight, the product is The amount can be adjusted as needed. The so-called paper-making process is to cut the raw fibers using a crutcher cutter, soak them in water, disperse them, and make them into a fluid using a Fourdrinier or round netting, then slit them uniformly and stack them in several layers to a uniform thickness. That's what I'm saying. In the second step, the layered material with a certain thickness obtained in the previous step is pressed using a dehydration press until the moisture content is about 50% by weight, and this material is subjected to punching. In this case, the punching width for each stitch is 11 to 20 mm, and the punching width is 11 to 20 mm per 1 ^cm2 .
It is recommended that the fibers be entangled with each other at a needle density in the range of 14 to 21 needles. The type of resin emulsion with good water resistance to be impregnated in the third step does not particularly matter as long as it is dry.
For example, emulsions such as nitrocellulose, polyurethane elastomer, polyvinyl chloride, natural rubber and synthetic rubber are used, and the amount of resin emulsion impregnated may range from 20 to 40% by weight of the dry punched board. Recommended. Conventionally, in commercially available products called impregnated pulp boards or impregnated nonwoven fabric boards, the impregnated resin emulsion does not spread evenly throughout the interior, and remains only on the surface, resulting in insufficient peel strength, folding durability, and water resistance. On the other hand, in the method of the present invention, a large number of mesh holes are passed in the vertical direction by punching, so that the resin emulsion is sufficiently distributed inside, which solves the problems seen in the conventional products mentioned above. The fact that they were able to do so is emphasized as one of their characteristics. Example: 10 kg of old newspaper and 10 kg of shearing waste are shredded with a crusher, immersed in water, thoroughly sieved using a Fourdrinier method, and layered. This material was drained using a dehydration press until the water content was approximately 50% by weight, and the thickness was 2.2 cm.
Make a mm board. Ad・15m/m/ to this board
After performing punching treatment on the top and bottom at a needle density of 15 holes/cm ² , it was dried and thoroughly impregnated with 7 kg of polyurethane elastomer emulsion. Dry this to form a 1.8 mm thick board, and cut it into a pad shape as appropriate. Some of the performance of the product thus obtained by the method of the present invention are listed below:

[Table] In summary, each of the above products has its merits and demerits, but the product of the present invention has been shown to have performance above average despite using cheap waste products as raw materials. There is.

Claims (1)

[Scope of Claims] 1 Paper fiber products and chemical fiber products are shredded and immersed in water to be dispersed, and the resulting mixture is layered into a uniform fluid shape using a fourdrinier or round net method. The first step is to make a product of a certain thickness, the second step is to drain the material to a water content of about 50% by weight and perform punching (needle threading), and then the resulting material is coated with water-resistant resin. A manufacturing method for shoe inner core material, which comprises the third step of impregnating the material, drying it, and cutting it into an appropriate shape. 2. The method for manufacturing shoe inserts according to claim 1, wherein the paper fiber product used in the first step is waste paper, and the chemical fiber product is waste generated at a manufacturing factory. 3. A method for producing a core material for shoes according to claim 1, wherein the punching process in the second step has a needle carrying distance of 11 to 20 mm per unit, and a needle point density of 12 to 20 needles per ¹ cm2. . 4. The method for manufacturing a shoe midsole material according to claim 1, wherein in the third step, the dry weight of the water-resistant resin impregnated into the dry board is in the range of 20 to 40%.