JPS61252353A - Nonwoven sheet made of shape memory resin - 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 Field of the Invention The present invention relates to the construction of a nonwoven fabric sheet made of a fiber resin having shape memory properties.

BACKGROUND OF THE INVENTION Conventionally, nonwoven fabrics have generally been made by bonding natural or synthetic fiber webs with synthetic rubber or synthetic resin. In recent years, non-woven fabrics have become lightweight and inexpensive, so they can be used as disposable clothing, such as dresses and leisure shirts, by folding them into small, portable cans that can be easily carried.Their elasticity recovers the moment they are taken out. The shape has been restored to a functional state.

Problems to be Solved by the Invention However, when using the elasticity of conventional materials, when the shape is deformed, a means to keep it small, such as canning, may be necessary. Problems such as wrinkles remaining when folded when opened, limit the range of use.

Means for Solving the Problems The present invention solves the above-mentioned problems by forming materials such as fibers, adhesives, films, and knitted sheets constituting a nonwoven fabric sheet from shape memory resin, The present invention provides a shape memory resin nonwoven fabric sheet that is molded into a specific shape and then recovered to a state suitable for use by utilizing the temperature-induced deformation characteristics of the shape memory resin.

An embodiment of the present invention will be described below with reference to the drawings.

Embodiment 1゜ Fig. 1 9), (B), and (C) are perspective views showing one embodiment of the present invention, A) is before deformation, (B) is after deformation, and (C) is
indicates the state returned to before deformation by heating. (1) A nonwoven fabric sheet is formed by joining a web of resin fibers having shape memory properties such as polynorbornene, random, cross, or parallel with a resin binder.

Incidentally, the tree W having the above-mentioned shape memory property! In addition to fibers, ordinary natural or synthetic fibers can be mixed and used to impart directionality to the fibers, and by varying the thickness and amount, the shape memory properties can be diversified.

In addition, polynorbornene resin has low hardness and can be freely deformed at room temperature, but its glass transition point is around 85°C, which is considerably higher than that of general rubber, and its molecular weight is nearly 10 times, so it takes a long time to restore its shape. However, by adding external energy (for example, immersion in boiling water), the relaxation time can be drastically shortened.
It can be returned to its original shape within seconds.

In addition, in Fig. 2), (E), and (F) are formed in advance in the same manner as above to form the nonwoven fabric as shown in ), and after deforming it as shown in (E), the original structure is restored by heat treatment. shape (to)
Indicates a return to good condition.

Example 2 Figure 3 is a sectional view showing another embodiment of the present invention, in which a web formed of fibers <3) made of a resin with shape memory properties is bonded with a resin made of a resin with shape memory properties. agent (4
) to bond the fibers together to form a nonwoven fabric.

In addition, by appropriately selecting the shape, thickness, weight, directionality, etc. of the fibers as necessary, it is possible to exhibit the shape memory properties of the fibers in conjunction with the shape memory properties of the fibers.

Example 3 FIG. 8 similarly shows a cross-sectional view of another example, in which a nonwoven fabric (5) made of fibers such as resin having shape memory properties, or ordinary fibers or a mixture thereof, and a shape Nine films or sheets (woven fabrics) made of resins with memory properties (6
) are joined to form a composite sheet.

The fibers of the nonwoven fabric and the films or sheets may be bonded to each other using a resin having shape memory properties or a common resin adhesive, and if necessary, the bonding may be performed by heat fusion.

Furthermore, the lamination of the nonwoven fabric and the film or sheet may be performed by combining and laminating one or more of each of the nonwoven fabrics and films or sheets to form a composite sheet.

Effects of the Invention Since the present invention has the above-mentioned structure, when the nonwoven fabric is used for clothing, industrial materials, etc., such as clothing, it is easy to fit the body, and after washing, it can be easily returned to its original shape by heating means. I can do it.

In addition, it can be easily molded into desired shapes such as bra butts, automobile interior materials, air filters (zigzag shape), etc.
After cleaning, it can be returned to its original shape by heating means.

On the other hand, if it is molded into a specific shape in advance, even if it is deformed due to deformation during use, it can be returned to its original shape using heating means. This invention has the advantage of being easy to mold and economical without the need for complicated molding methods.

[Brief explanation of drawings]

Figure 1 A), (B), (C) and Figures 2), (E), and (F) are respectively perspective views showing a shape-memory resin nonwoven fabric sheet and its deformed state as an embodiment of the present invention. This figure and FIG. 4 are structural sectional views showing other embodiments. +11.181... Shape memory resin fiber, Cυ... Resin binder, (4)... Shape memory resin adhesive, (6)
...Nonwoven fabric, (Ill...film or sheet

Claims (2)

[Claims] (1) A nonwoven fabric sheet made of shape memory resin, characterized in that it is formed of only resin fibers having shape memory properties or of the fibers and a resin adhesive. (2) A shape memory resin nonwoven fabric sheet according to claim 1, wherein the shape memory resin nonwoven fabric sheet forms a composite sheet with a shape memory resin film, knitted fabric, etc.