JPS61110540A - Fiber material for cold press molding - 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 (Technical Field of the Invention) The present invention relates to a fibrous material suitable for cold press molding.

(Prior art and its problems) The outer part of polypropylene (hereinafter referred to as PP) fiber is coated with polyethylene (hereinafter referred to as PE), and this P
mItt, in which PP fibers are bonded together by E, has a better texture, elasticity and softness than conventional woven fabrics, and also has good shape retention after molding. Its field of application is expanding.

However, this AI miscellaneous material has a narrow moldable temperature range and a small heat capacity, which makes it extremely difficult to mold it while maintaining the feel and texture unique to 11 liter.

Therefore, when this fiber is applied to a material for cold press molding, temperature unevenness during cold press molding tends to directly affect the molded product. In other words, if the molding temperature is too high during cold press molding, not only will the original texture of the fiber be impaired, but the fiber will also be deformed more than necessary. On the other hand, if the molding temperature is too low, residual stress will be large, resulting in poor molding.

Therefore, when cold press molding this type of IIN, extremely strict temperature control is required, which is difficult to implement in practice.

(Objective of the invention) The present invention aims to provide
Moreover, the purpose is to make it possible to significantly ease the adjustment of the temperature range during cold press molding.

(Structure and Effect of the Invention) In order to achieve the above object, the present invention provides a fiber in which the outer periphery of a polypropylene fiber is coated with polyethylene, and 1 llft of polypropylene is bonded to each other by the polyethylene, wherein one surface of the fiber is It is characterized by being integrally laminated with a high heat capacity backup material.

According to the fiber material having the above configuration, by selecting a backup material, the heat capacity of the 1JJi fiber material can be increased to a predetermined value. Thereby, during cold press molding, temperature control can be significantly relaxed for this type of fiber material. Further, in the present invention, residual stress and other molding defects are reduced.

Furthermore, the risk of spoiling the feel and texture unique to 1M miscellaneous products is also reduced.

(Description of Examples) FIG. 1 shows a fiber 11 and an abrasive material 1 to which the present invention is applied.

For cold press! INIJI 11 is obtained by laminating fibers 2 on one side, that is, the back side, with a high heat capacity backup material 3 via a bonding agent 4 using a laminating method such as a non-stick process.

As shown in -1-, the fiber 2 is made by coating the outer periphery of the PP fiber with PE and using the difference in melting point between PP and P[ to produce PPmN.
It is a combination of two. Therefore, the fiber surface is P
When heated to 130°C to 165°C, which is the melting point of E, the inside of the fiber is maintained at a temperature above the softening point and below the melting point of PP, and also has a small heat shrinkage rate of 10% or less, and has a good texture. It is.

Further, as the backup material 3, for example, a foamed polyurethane slab material having a relatively high heat capacity is used. If the urethane slab material 3 is impregnated with a thermoplastic resin as required, it is possible to improve the shape retention after molding the urethane slab material 3.

The thickness of the backup material 3 is set to a thickness that provides a preferable heat capacity to the fiber lit 2, or the thickness is set in consideration of cushioning properties since the laminated backup material 3 functions as a pad.

FIGS. 2(a) to 2d) are explanatory diagrams showing the general steps of a cold press molding method using the fiber 1 as a raw fabric.

First, the il fiber fabric is trimmed along the developed shape of the molded body. Both sides of the blank 7 thus obtained are supported with clamps 5 and heated with a heater 6, as shown in FIG. 2(a). This heating temperature is higher than the melting point of PE, higher than the softening point of PPI, and lower than the melting point of PPI.

Next, the heated blank 7 is set in the lower mold 8 for cold press molding (see Fig. 2 (b)), and then the upper mold 9 is engaged with the lower mold 8, and the heated blank 1 is is press-formed into the desired shape (Fig. 2 (c), (d)
)reference).

During the period from heating to cold press molding, heat release from the upper layer is greatly suppressed by the lower layer with high heat capacity. Therefore, the blank 7 has a high heat capacity as a whole, and while maintaining the feel and texture unique to nonwoven fabrics,
It is molded at a predetermined expansion magnification.

In addition, when a foamed polyurethane slab impregnated with thermoplastic resin is used as the backup material 3, by heating,
Since the resin inside is once melted and re-solidified by cooling within the mold, the backup material a side also has shape retention after molding, and a better molded product can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional perspective view showing the 1B material according to the present invention, Fig. 2 is a schematic cross-sectional view showing the second stage of cold press molding, and Fig. 2 (a) is a cross-sectional view showing the state of breheating. ,
Fig. 2(b) is a sectional view showing the state before press forming;
Figure (C) is a sectional view showing the state during press forming, and Figure 2 (
d) is a sectional view showing the molded product after press molding. 1...Fiber material, 2...II miscellaneous, 3...Backup material, 4...Adhesive. Patent applicant Kasai Kogyo Co., Ltd. Ne1 Agent Patent attorney Tetsuji Iwakura (1 other person) -6=

Claims (1)

[Claims] The outer periphery of polypropylene fibers is coated with polyethylene,
A fiber material for cold press molding, characterized in that the fiber is made of polypropylene fibers bonded to each other by polyethylene, and one side of the fiber is integrally laminated with a high heat capacity backup material.