JPS6336060Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a laminate with extremely small warpage and twist.

Currently, high modulus fiber fabrics such as glass fiber fabrics, carbon fiber fabrics, and aromatic polyamide fiber fabrics are widely used as reinforcing base materials for various resins. However, the high-modulus fiber twists that make up these high-modulus fiber fabrics have a lower modulus than the generally widely used synthetic fiber twists and natural fiber twists, which have low elastic modulus.
Because it has an extremely high torsional moment,
Conventional high elastic modulus fiber twisted fabrics woven with a similar yarn composition to fabrics using normal low elastic modulus fiber twisted yarns are
The disadvantage is that the entire fabric is twisted.

When a conventional high-modulus fiber fabric with large twists is used as a reinforcing material for various resins to mold various laminated molded products, the fabric twists during molding, causing the finished molded product to warp. This has the problem that it tends to occur.

In order to solve the problem of large warping and twisting of laminates using high-modulus fiber fabrics, the present inventors conducted various studies on the thread composition of high-modulus fiber fabrics used in laminates. As a result, one of the warp and weft is made up of a high elastic modulus fiber yarn with a small twisting moment, and the other is made up of an S-twist high-modulus fiber yarn with a large twisting moment and a Z-twist high-elastic modulus fiber with a large twisting moment. By arranging every 100 yarns alternately and canceling out the large twisting moment of the high-modulus fiber yarns, the twist of the high-modulus fiber fabric becomes extremely small.
We have discovered that warping and twisting of laminates using these high-modulus fiber fabrics are almost completely eliminated, leading to the present invention.

The present invention will be explained below with reference to the drawings.

1 to 3 are organization diagrams of a high modulus fiber plain weave fabric, which is an example of a high modulus fiber fabric used in the laminate of the present invention. Further, FIG. 4 shows a cross section of the laminate of the present invention.

The organization chart shown in FIG. 1 is that of a plain weave glass fiber fabric. This glass fiber plain weave fabric has a small number of twists in the warp 1 and a small twisting moment.
Constructed from ECG75-1/0 0.1Z single yarn of glass fiber, weft is ECG75-0.1 4.0Z single yarn of glass fiber 2
and ECG75-1/0 4.1S glass fiber 3 and 1
Each book is structured alternately. A B-staged prepreg was created from this glass fiber plain weave fabric using epoxy resin varnish, and then 8 sheets were stacked.
A laminate with a thickness of 1.6 mm was prepared by hot-pressing at 170°C and 80 kg/cm ² . This laminate was cut into 500 mm squares and placed on a surface plate with three corners touching, and the distance between the remaining corner and the surface plate was measured and found to be extremely small at 0.5 mm. On the other hand, when a laminate using a conventional glass fiber plain weave fabric was measured using the same method, it was 5 mm larger.

The organization chart shown in FIG. 2 is that of a carbon fiber plain weave fabric. This carbon fiber plain weave fabric has warp 4
Two untwisted carbon fiber single yarns with a thickness of 35 tex and twisted 4 times/2.5 cm in the Z direction are 3.8 in the S direction.
It is composed of carbon fiber plied yarn with a small twisting moment that is twisted twice/2.5cm, and the warp is twisted in the S direction 3.0 times/2.5cm with a thickness of 70 tex carbon fiber single yarn 5 and the Z direction. Each yarn is made up of carbon fiber single yarns 6 with a thickness of 70 tex twisted 2.8 times/2.5 cm. A laminate was made from this carbon fiber fabric in the same manner as described above, and the warp and twist were measured and found to be as small as 1.5 mm.

The organization diagram shown in FIG. 3 is that of a blended plain weave fabric of glass fibers and aromatic polyamide fibers.
This blended plain weave fabric has warp 7 of ECG150-1/2
Constructed from 3.8Z (glass fiber plied yarn made by twisting 4.0S first twist with two ECG150 single glass fibers to make 3.8Z), warp is 4.0 turns/2.5cm in S direction
Aromatic polyamide fiber single yarn 8 with a thickness of 70 tex twisted with It is composed of A laminate was made from this blended plain weave fabric in the same manner as described above, and the warping and twisting were evaluated.
It was as small as mm.

Examples of high elastic modulus fiber yarns constituting the fabric used in the laminate of the present invention include glass fiber yarns, carbon fiber yarns, aromatic polyamide fiber yarns, metal fiber yarns, and the like.

In these fabrics made of high elastic modulus fiber yarns, yarns with a small twisting moment constituting the warp or weft include single yarns with a small number of twists and/or double yarns twisted so that the twisting moment is small. When using single yarns, the twisting moment decreases as the number of twists decreases, so in order to particularly reduce the twist of the fabric, the number of twists of the single yarns should be 0.3 turns/2.5 cm or less. In addition, in order to obtain a doubled yarn with a small twisting moment, the average number of twists of the first twisted single yarn twisted in the same direction is A times/
In the case of 2.5cm, these single yarns are bundled and twisted in the opposite direction to the single yarn by 0.5A to 1.0A/2.5cm.
Particularly preferably, it is preferable to apply a final twist of 0.6A to 0.9A times/2.5cm.

Single yarns and/or doubled yarns are used as the S-twisted yarns and Z-twisted yarns having a large twisting moment, which constitute either the warp or the weft of the fabric used in the laminate of the present invention. By alternately configuring S-twisted yarns and Z-twisted yarns, which have twisting moments in opposite directions, it is possible to suppress the twisting of the fabric, but if the balance between the torsional moments of the S-twisted yarns and the torsional moments of the Z-twisted yarns is lost, the overall fabric Since the twist becomes large, it is desirable to make the absolute values of the twisting moment of the S-twist yarn and the twisting moment of the Z-twist yarn almost equal. That is, the average number of twists and the average thickness of the S-twisted yarn are Ns turns/2.5cm and Ts texture, and the average number of twists and average thickness of the Z-twisted yarn are Nz.
By selecting S-twisted yarn and Z-twisted yarn that satisfy the relational expression NsTs/NzTz=0.7 to 1.3 and configuring them alternately, the twist of the entire fabric can be minimized. I can do it. In addition, in order to most effectively cancel out the torsional moment, it is sufficient to configure each S-twisted yarn and each Z-twisted yarn, but even if they are configured every 2 or even 100 yarns, the effect will work and the fabric will The overall twist can be reduced. The number of threads to be arranged alternately can be selected depending on the thickness of the threads used.

The high modulus fiber fabrics used in the laminate of the present invention include various types of fabrics with different weaving methods (plain weave fabric, open plain weave fabric, twill fabric, satin weave fabric, leno weave fabric, mosa weave fabric, satin weave fabric) , honeycomb fabrics, etc.). Even with these different weaving methods, either the warp or the weft is made up of a high-modulus fiber yarn with a small twisting moment, and the other is made up of an S-twisted high-modulus fiber yarn with a large twisting moment and a Z-twisted fiber yarn with a large twisting moment. By alternately configuring 1 to 100 twisted high-modulus fiber yarns, the twist of the fabric becomes extremely small, so the warp and twist of the laminate can be reduced. The laminate of the present invention has a high elastic modulus fiber fabric used in which either the warp or the weft is composed of high elastic modulus fiber yarns with a small twisting moment, and the other is made up of S-twisted high elastic modulus fibers with a large twisting moment. It is characterized by almost no warpage or twisting, as the threads and Z-twisted high elastic modulus fiber threads, which have a large twisting moment, are alternately arranged every 1 to 100 threads, and the twisting of the entire fabric is extremely small. be.

[Brief explanation of drawings]

FIGS. 1 to 3 are organization charts showing an example of a high elastic modulus fiber fabric used in the laminate of the present invention. FIG. 4 is a sectional view of the laminate of the present invention.

【table】

Claims (1)

[Scope of utility model registration request] The number of twists for either warp or weft is 0.3
It is composed of a high elastic modulus fiber single yarn with a small twisting moment of 2.5cm or less or a high elastic modulus double yarn with a small twisting moment, and the other is (Ns・Ts)/
(Nz/Tz) = 0.7 to 1.3 (however, Ns is the number of twists of the S-twist high-modulus fiber yarn, times/2.5cm, and Nz is the number of twists of the Z-twist high-modulus fiber yarn, times/2.5cm. Ts is the tex of the S-twist high-modulus fiber yarn, g/Km, and Tz is the tex of the Z-twist high-modulus fiber yarn, g/Km). A laminate made by impregnating a high modulus fiber fabric with a resin and laminating the high modulus fiber fabric alternately with large Z-twist high modulus fiber yarns every 1 to 100, and then curing the fabric.