JPS5959433A - Deep drawing method for interlining material for automotive interior trim - Google Patents

Abstract

PURPOSE:To deep draw while preventing tearing or breakage, by a method wherein a fiber fabric is provided on the surface or in the inside part of an uncured bulky felt obtained by adding a thermosetting resin or the like to a fibrous material as a binder, and the resultant material is pressed with heating. CONSTITUTION:A thermosetting resin or a thermoplastic resin is added as a binder to a fibrous material such as wood fibers, natural fibers, chemical synthetic fibers or a mixture thereof to produce an uncured bulky felt. A fiber fabric having a predetermined tensile strength is provided on one or both sides or in the inside part of the felt, the resultant material is pressed with heating to deep draw it into the interlining material for automotive interior trim. The fiber fabric may be a roughly woven natural fiber fabric such as gauze, a chemical fiber fabric or other nonwoven fabric which has the predetermined tensile strength.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming deep-drawn core materials for automobile interiors.

Wood fiber (wood fiber, wood valve).

regeneration valve, etc.), natural w1. Miscellaneous (cotton, linen*), chemically synthesized fibers (acrylic, polyester, vinyl chloride).

Fiber materials (50-
91r%) and thermosetting resin (phenol,
Melamine, urea, etc.) or thermoplastic resin (polypropylene, polyethylene, etc.) is added in an amount of 2 to 50%, mixed and stirred well, and the core material for automobile interiors is made into uneven shapes by heating and pressurizing the molds with male and female molds. Molding into a shape has been practiced for a long time. However, since the material of Sowara has almost no stretchability like #Ki, when deep drawing is attempted, the material splits and tears occur during the process of joining the male and female molds, which prevents the desired deep drawing from being completed. could not. Particularly in case of 1a, when the fiber length is short, the intertwining between the fibers is difficult, which further causes such molding defects. Also, for the same reason, when attempting to create a steeply sloped drawing, even if the depth was shallow, the material would similarly rupture, making it impossible to form. For this reason, conventional molded products could only be molded with rounded corners of the protrusions.

The present invention aims to solve the above-mentioned conventional drawbacks, and is made by adding a thermosetting resin or thermoplastic resin as a binder to fiber materials such as wood fibers, natural fibers, chemically synthesized fibers, etc., or mixed materials thereof. #I that has the desired expansion force on one surface, one surface, or inside the bulky felt in an uncured state!
A fabric miscellaneous cloth is placed, this is set into male and female molds, and heated and pressurized to eliminate tearing and tearing of the material during molding and enable deep drawing. The above-mentioned fiber cloth 2 can be used, such as coarsely woven natural fiber woven fabric such as curlew, bamboo chemical fiber woven fabric, or other non-woven fabrics having the desired expansion power.

The present invention will be explained below with reference to Examples 2. Fiber length /~/! ;l
l'nl wood fiber 60% (weight), fiber length 70-5
A mixed material composed of 70% (by weight) of natural fibers with fiber lengths between 0 and 70% and 70% (by weight) of chemically synthesized Rm with a fiber length of 70 to 50 (such materials are usually available as scrap products at low prices and in large quantities).
Sprinkle 70% (by weight) of thermosetting resin and mix well and stir to form a matte bulky felt with a thickness of 30mm, weight of 7m2. Gauze is stretched as a cloth with the desired expansion power, and this is set in male and female shapes and heated and pressurized to form a deep-drawn shape with the same thickness as shown in Figure 1. A core material for automobile interiors could be formed.

Next, in order to confirm the effect of stretching the fiber cloth in this way, in the dimensional drawing of the #:ll1M type shown in Figure 2, the drawing angle was varied from 5'' to 33@, and when it was -1, Conduct a molding test 1.-1 Test: one without fiber cloth at all, one with fiber cloth stretched on one surface (male side) of bulky felt, and one with fiber cloth stretched inside the bulky felt like a sand inch. Three pieces of fiber cloth were examined for tearing and tearing.

However, the molding pressure at that time was /OkQ/an'', the molding temperature was 200''O1, and the molding time was 170 seconds. The results clearly showed the effect of arranging the fiber cloth as shown in the following table.

Table 1 (Presence of gagging and tearing) If the proportion of wood fibers, waste paper, etc. is high, and the proportion of short fiber components in bulky felt is high, the entanglement between the shingled fibers is weak, and the stiffness is generally weak. However, adding a fiber cloth to this prevents breakage during handling and improves molding workability.

It is of course most desirable to place the fiber cloth on both surfaces of the bulky felt from the viewpoint of strength, but considering the T11 manufacturing cost, it may be possible to place the fiber cloth only on one surface. By placing it on the side, the frictional resistance with the protrusion on the male surface is 111! l fibers are more effective for reducing the weight. In addition, when the μt ## cloth is placed inside, it is effective in preventing breakage when the molded product is molded to have an uneven shape that protrudes not only on one side but also on both sides.

As described above, the deep drawing method for core material for automobile interiors according to the present invention suppresses the elongation of the bulky felt during molding by disposing the fiber cloth having expansion force, and also improves the sliding with the inner surface of the mold. This prevents excessive tensile force from being applied to the bulky felt and prevents it from tearing or tearing, making it possible to form the material into deep-drawn or acute-angled interior decoration shapes.
@ is what makes it so.

[Brief explanation of the drawing]

FIG. 1 is an r) perspective view of a core material for automobile interior according to the present invention, and FIG. 2 is a sectional view of male and female molds for experimental use. Patent applicant: Howa Textile Industry Co., Ltd. 1.1. ;1,1

Claims (1)

[Claims] One or both surfaces of uncured bulky felt made by adding thermosetting resin or thermoplastic resin as a binder to inverted fibers such as wood fibers, natural fibers, chemically synthesized fibers, or mixed materials thereof. A method for deep drawing a core material for an automatic girder interior, characterized by arranging a fiber cloth having a desired expansion force inside, setting it in a male and female mold, and heating and pressurizing it.