JPS58156063A - Sheet for molding substrate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet for a molded base material using alloy fibers having a shape memory effect. The purpose of the present invention is to provide a sheet for a molding base material that is easy to handle, transport, and easily mold by restoring a sheet material that has been embossed into a shape to memorize the shape to its original shape when used. It is something to do.

Conventionally, sheet materials for molding have been made of synthetic fibers, inorganic fibers, nonwoven fabrics made of fiber webs coated with heat-fusible, low-melting point fibers, or these nonwoven fabrics and resin films, woven fabrics, and mesh fibers. There are sheet materials in which a seed layer sheet is used as a base material and is impregnated with thermoplastic W resin or thermosetting resin as required. When molding a sheet material to be bent, the sheet material is cut to a predetermined size and then pressurized and heated using an M male mold to form it into the desired shape to obtain a molded product together with a resin key, or the sheet material is cut into a predetermined size and molded into the desired shape. Molded products are made by softening or melting melting point fibers and then press-molding them. However, the former method requires a batch system, has low productivity, requires a large number of molds, and has the drawbacks of uneven resin density and cellulose, making it difficult to obtain molded products of uniform quality.

Furthermore, since the latter lacks elasticity, deep-bottom molded products tend to wrinkle easily and cannot be molded into complex shapes. In addition, since the molding is carried out by heat fusion, it has the disadvantage that it easily adheres to the mold and has poor workability. It left some serious problems.

The object of the present invention is to provide a sheet for a molded base material for obtaining a molded product that improves the above-mentioned conventional drawbacks. A non-woven fabric sheet material is formed using the material, and the sheet material is memorized by applying stress to a desired shape in advance at a temperature higher than the martensitic transformation point.The sheet material can be heated to memorize the shape when used, and it can be returned to the original shape. Therefore, it is possible to obtain a sheet for a molded base material that has excellent bulk and texture that cannot be obtained with conventional nonwoven fabric sheet materials, and is easy to mold, handle, transport, and store.

The shape memory alloy fiber used in the present invention includes Ti-Ni
, Ou-Zn-Aj, Ou-Ni-Al, 0
Fibers or fibrous materials such as u-Zn-3n and Ou-Zn-Si can be used. In addition to these shape descriptions 1-alloy fibers, there are also chemicals such as polyester, polyamide, aromatic polyamide, polypropylene, polyethylene, vinylidene, polyurethane, phenol, polyfluoroethylene, glass fiber, carbon fiber, rock fiber, metal fiber, etc. Fibers or natural fibers such as wool, cotton, linen, and coconut, or fibers in proportions thereof may be mixed.

To form a sheet for a molded base material using such fibers, a fiber assembly in the form of a silanip is formed using a wapple forming machine such as a garnet machine or a fiber opening machine, and then physical bonding is performed using needle punching and stench bonding. Treatment, acrylic, epoxy, urethane, NBR.

s BR% Vinyl chloride, ethylene-vinyl acetate,
Emulsions such as phenol and melamine, latex,
Water bath liquid or solvent solution type adhesive, or polyethylene,
Chemical bonding treatment using polyamide or polyester resin powder, or use of low-melting point fibers as adhesive fibers between shape memory alloy fibers, or furthermore, shape memory alloy fibers are arranged in a crimped state in advance and crimped by heating. A sheet for forming a substrate can be formed by a bonding process such as intertwining the accumulated fibers into a felt shape.

The shape memory alloy fibers used are short fibers or long fibers with a thickness of 100 μm or less.

An embodiment of the present invention will be described below with reference to a static axis.

Practical example 1 Ti-Ni shape memory alloy short fiber d (T155
．． Using a mixed fiber of 5% by weight) 60% and 440% polypropylene with a thickness of 6 denier, the fabric weight was 50% by opening.
A web-like castelloid of Og/d was formed, and a mat-like sheet for a molded base material was produced by bonding the fibers of the castelloid with each other by needle punching and impregnation or spraying with NBR latex.

In order to mold an automobile floor mat using this molding base sheet, molds 1a and 1b are used as shown in FIG.
Insert the 1C molded base material sheet 2 and press at a temperature higher than the martensitic transformation point (60 ° C. or higher). , an automobile floor mat 3 is formed as shown in FIG. It is preferable to apply a resin binder to the surface of the molded automobile floor mat by impregnating or spraying the resin binder.

Such floor mats are subject to a 6th
As shown in the figure, the temperature below the martensitic transformation point (30
Since the grapes can be pressed in a sheet state 4 by pressing at temperatures below .degree. The above-mentioned automobile floor mat also had an excellent static electricity removal effect.

Example 2 0u-Zn-8i (Qu 65.9%,
A web with a basis weight of 130 g/m2 is made by forming a mixed fiber of 70% shape memory alloy fiber and 30% polypropylene fiber of 3 denier x 51M using a garnet machine. 13 gauges/2! i 2 gill % sufu'
Stitch bonding was carried out under conditions of 511 Jl, and the fibers were further bonded with SBR latex to obtain sheet 5 for molded base material. This is shown in Figure 4/r.Mask mold 6
Pressing is carried out continuously at room temperature with a press machine equipped with a and 6b at a humidity above the martensite transformation point (-4° C. or above) to form a mask shape and mark the shape. When such a product is shipped, it is formed into a sheet again at a temperature below the martensitic transformation point, and when used, it is heated to restore the original mask shape and can be cut and used. Further, a brassiere cup can also be easily molded in the same manner as described above.

Example 6 65% Ti-Ni (Ti 55.511) shape memory alloy fibers with a diameter of 6 μ and polyester fibers 6 dl x 51 3
Using a web forming machine, the fibers mixed with 5%
g/m! ! A sheet-like fiber aggregate was formed, and the fibers were appropriately entangled with each other by needle punching, and then acrylic acid ester*1m emulsion was sprayed on the front and back surfaces of the web (resin solid content deposited - 15 a/m2 deposited on one side). This filling was heated once above the martensitic transformation point (60°C or higher) to memorize its bulky shape, and then compressed once below the martensitic transformation point to form a flat sheet. The filling of the zero-containing rice has a low apparent density and a large porosity, so it is usually expensive to transport and is inconvenient to handle.However, the filling of the present invention has a flat sheet shape. It can be transported as a product, and when used, it can be restored to its original height by heating it above the martensitic transformation point, making it extremely easy to handle and transport.

It should be noted that the shape memory alloy fibers used in the above examples can be appropriately selected and used according to workability by preparing alloy fibers with different martensitic transformations with different composition ratios of alloy components. can.

As described above, the present invention forms a sheet using a forming base using shape memory alloy fibers, and from fc, external stress is applied in advance at a temperature above the martensitic transformation point in accordance with the forming condition to obtain a water-stopped molded product. , memorize the shape 6, and 1
lil! If it is made into a sheet for convenient handling and transportation, it can be easily restored to its original shape by heating during use, making handling and transportation very convenient and efficient. Since it does not take up any space as a product, storage space is kept to a minimum and it can be used for various purposes in each building. In addition, the resulting molded product is not subjected to high-temperature U-pressure as in the conventional method, so it is possible to obtain a molded product that is smooth and has an excellent texture. This invention has the following.

[Brief explanation of drawings]

Fig. 1 is a thin sectional view showing the molded state of a sheet for a molded base material according to an embodiment of the present invention, Fig. 2 is a perspective view of a 70 armat for automobiles obtained by the same molding, and Fig. 3 is the same sheet. Side view showing rapid deformation to the state and restoration state to the molded product, No. 4
The figure is a cross-sectional view of a molding device showing an embodiment of the rotation function. 1a. i'b, 6a, 6kl ''Mold 2.5...
・Sheet for molded base material 6...Car floor mantle 4...Sheet condition Patent applicant Hiroshi Kanai, Masato Kiyoaki Hayashi゛;゛111. ! Lgu・Ashi 2- (l.

Claims (2)

[Claims] (1) Shape description: A sheet for a molded base material, characterized in that it is formed by physically and chemically bonding a fiber aggregate formed of single-layer alloy fibers. (2) The sheet for a molded substrate according to claim 1, wherein the fiber aggregate is formed containing at least 5% of chemical fibers, natural fibers, etc.