JPH11333958A - Soft synthetic resin composite sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture of a composite sheet, having excellent reinforcing characteristics capable of maintaining fiber reinforcing effect even when the warp or weft of a fiber reinforced material is cut and having no fault in quality. SOLUTION: A warp knitting net fabric 12, in which warps and wefts, which are consisting of high tensile long staples of non-twisted or low twisting number, are arranged in the shape of longitudinal and lateral lattice while the warps and wefts are connected through fine warp knitting warps and leno wefts to reticulate them, is used for a fiber reinforced material 2 buried into the intermediate part of the thickness of a matrix sheet 1 made of a soft resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft synthetic resin composite sheet used for waterproofing a roof of a building or a veranda, waterproofing a civil engineering work, and the like.

[0002]

2. Description of the Related Art Heretofore, as a soft composite sheet for waterproofing or the like, a tension is applied to an intermediate portion of the thickness of a soft base material sheet made of a soft synthetic resin such as a soft vinyl chloride resin or a non-vulcanized rubber. There is known one in which rigidity, durability, and dimensional stability are improved by embedding a flexible fiber reinforcing material.

As the fiber reinforcing material, for example, as shown in Japanese Patent Application Laid-Open No. 58-126335, a lattice woven fabric made of glass fiber or synthetic fiber, which is plain or entangled, is generally used. , Has been adopted a lot. A soft composite sheet using a lattice-like woven fabric made of such tensile fibers as a reinforcing material exhibits high strength in the longitudinal direction and the horizontal direction, which are the orientation directions of the reinforcing fiber yarns, and expands and contracts the soft base material sheet. Is regulated, and the expected effect can be realized in that a significant deformation of the base material sheet due to a temperature change can be prevented.

However, the tensile strength of the conventional fiber-reinforced composite sheet largely depends on the tensile strength of the warp yarn of the woven fabric reinforcing material. In this case, the stresses that were opposed to each other were applied to the base material sheet all at once, and there was a possibility that cracks and the like would occur in the sheet due to the sudden stress.

Further, in the production of a composite sheet, when a fiber reinforcing material is sandwiched between two upper and lower resin layers of a base material sheet and laminated and integrated, a plain woven fabric is used due to the influence of strain stress of the resin layer. If the warp yarn is misaligned, misalignment may occur in the warp yarns, resulting in product failure. There is a problem that wrinkles are generated and the product value is likely to be reduced.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional products, the present invention has a reinforcing effect which is more excellent than that of the conventional products, and has a low production rate of defective products. An object is to provide a flexible composite sheet that can be formed.

[0007]

SUMMARY OF THE INVENTION The present invention has a main feature in that, for the above-mentioned object, a warp knitted net having weft insertion yarns arranged in a lattice is used as a fiber reinforcing material.

That is, according to the first aspect of the present invention, there is provided a flexible base material made of a soft synthetic resin or rubber as a base material and a fiber reinforcing material embedded in an intermediate portion of a thickness of the base material sheet. In the synthetic resin composite sheet, the fiber reinforcing material arranges a warp-inserted yarn and a weft-inserted yarn made of a non-twisted or low-twisted tensile long fiber in a vertical and horizontal lattice shape, and these weft-inserted yarns have a warp knitting structure. A soft synthetic resin composite sheet comprising a warp knitted net formed by binding with a fine ground knitting warp and an entangled warp to form a net.

The warp knitted net used as a reinforcing material is
The warp insertion yarns and the weft insertion yarns arranged in a vertical and horizontal lattice form not only exhibit the same reinforcing effect as when a conventional woven fabric is used, but also when the warp insertion yarns break for any reason. Even so, the ground knitting warp and the entangled warp in the ground knitting structure connected to them are involved in the reinforcing action, thereby preventing a sudden large stress load from being applied to the base material sheet. For this reason, it is possible to prevent the composite sheet from cracking due to the above-mentioned causes.

[0010] Further, since the warp insertion yarns and the weft insertion yarns arranged in a lattice are connected and held by the ground knitting structure by warp knitting, the ground knitting structure has relatively free elasticity. Together with this, there is room for relatively free displacement without being restrained by each other. For this reason, when manufacturing a composite sheet, the warp-insertion yarn and the weft-insertion yarn do not exhibit a large resistance to the strain stress generated inside the resin layer during lamination with the soft resin in the base material sheet. , And absorbs the stress to prevent wrinkles from occurring in the reinforcing material and prevent the composite sheet from being damaged in surface smoothness. Therefore, it is easy to produce a high-quality composite sheet.

[0011] According to a second aspect of the present invention, the warp insertion yarn and the weft insertion yarn are made of a 250-1000 denier multifilament yarn.

[0012] This makes it possible to impart a necessary and sufficient high reinforcing effect in the vertical and horizontal directions of the composite sheet.

According to a third aspect of the present invention, the ground knitting warp and the entangled warp are made of a 25-100 denier tensile fiber multifilament yarn.

Thus, the thickness of the reinforcing material can be made extremely thin, and even if it is a thin composite sheet, a fiber having an excellent appearance quality with no irregularities appearing on the surface due to the effect of the fiber reinforcing sheet. A reinforced composite sheet can be obtained.

According to a fourth aspect of the present invention, the warp-insertion yarn and the weft-insertion yarn have a weft-weft arrangement density of 7 to 12 yarns / inch.

[0016] With this arrangement, a sufficient opening can be provided between the weft insertion yarns while ensuring a sufficient reinforcing effect of the weft insertion yarns, and good integration of the upper and lower resin layers can be achieved.

The invention according to claim 5 further comprises a warp insertion yarn,
Both the ground knitting warp and the entangled warp are made of polyester fibers.

[0018] Thereby, it is more preferable that a reinforcing material having low elongation and high elastic modulus can be obtained at low cost.

[0019]

Next, the structure of the soft synthetic resin composite sheet (A) according to the present invention will be described in more detail with reference to the drawings.

As shown in FIGS. 1 and 2, the soft composite sheet (A) according to the present invention comprises a soft base material sheet (1) made of a soft synthetic resin or rubber as a base material, and a fiber in the middle of the thickness. The reinforcing material (2) is buried over the entire surface.

As the base material sheet (1), a thermoplastic synthetic resin sheet such as soft polyvinyl chloride, polyethylene or polypropylene, or a non-vulcanized rubber sheet or a rubber asphalt sheet is used. It is preferable to use a polyvinyl chloride sheet or an olefin resin sheet in terms of cost and the like. The sheet (1) is composed of an upper layer portion (1a) and a lower layer portion (1b) manufactured separately, and a fiber reinforcing material (2) is interposed therebetween to heat and press to integrate by welding. , Thickness 1.0 ~
It is configured to be about 2.5 mm. For the upper layer portion (1a), a material subjected to a weather resistance improving treatment as necessary is used. Further, a material having a higher hardness and a larger thickness than the lower layer portion (1b) may be used.

As the fiber reinforcing material (2), a warp knitted net fabric (12) containing weft insertion yarns knitted by a Russell machine is used. As shown in FIGS. 3 and 4, the warp knitted net fabric (12) has a warp insertion yarn (3) and a weft insertion yarn (4) made of a non-twisted or low-twisted tensile long fiber arranged in a vertical and horizontal lattice. These warp-inserted yarns (3) and (4) are connected to each other with a warp-knitted fine ground knitting warp (5) and an entangled warp (6) to form a net-like shape. It has a number of through-holes (7) or openings arranged in a matrix shape surrounded by (4).

In the illustrated embodiment, the weft insertion yarn (4)
Is held by a ground knitting warp (5) for each course, a warp insertion yarn (3) is positioned behind each wale of the ground knitting structure, and held by an entangled warp (6) arranged along the wale. Although it is said that it has been made, it is not limited to this structure, it is possible to adopt any other structure as long as it can hold the weft insertion yarn entangled with the warp knit ground knit structure It is possible.

The fiber used for the reinforcing material (2) is a synthetic fiber having a high elastic modulus and excellent tensile strength or a long fiber of an inorganic fiber. As a synthetic fiber, a polyester yarn or a nylon yarn is used, and as an inorganic fiber, a glass fiber, a carbon fiber, or the like is used. Above all, polyester fiber is inexpensive and has low elongation,
It is suitable in that a material having a high elastic modulus can be obtained.

The warp insertion yarn (3) and the weft insertion yarn (4) used for the warp knitted net fabric (12) have a relatively large thickness of 250-10.
A 00 denier multifilament yarn (24 to 192 filaments) is preferably used. On the basis of this range, the use of a filament yarn that is too thin cannot achieve the required reinforcing power. Conversely, if the filament yarn is too thick, unevenness due to the effect of the reinforcing material (2) tends to appear on the surface of the composite sheet, which not only deteriorates the appearance quality, but also results in an excess in the reinforcing effect and increases the cost. The disadvantages incurred increase.

On the other hand, the ground knitting warp (5) and the entangled warp (6) for binding and holding the weft insertion yarns (3) and (4) are relatively thin 25 to 100 denier tensile fiber multifilament yarns. It is preferably used. These warps (5) (6)
If the thickness is too small based on the above thickness range, the stability of the net and the holding force of the weft insertion yarns (3) and (4) may be insufficient. On the other hand, if the thickness is too large, unevenness due to the effect of the reinforcing material (2) is likely to appear on the surface of the composite sheet (A) as described above, and the quality may be deteriorated.

The weft insertion density of the warp insertion yarn (3) and the weft insertion yarn (4) is preferably set to about 7 to 12 yarns / inch. If the density is too low, the reinforcing effect may be insufficient. On the other hand, if the density is too high, the opening ratio due to the through-holes (7) becomes low. The adhesion between the upper layer portion (1a) and the lower layer portion (1b) deteriorates, and the physical properties of the composite sheet (A) decrease.

The production of the above-mentioned flexible composite sheet (A) according to the present invention is performed, for example, by sandwiching a fiber reinforcing material (2) between two flexible base resin sheets extruded to a required thickness. It is carried out by introducing between the pair of pressure rolls, heating and pressurizing, and joining and integrating the three members into a laminated shape.

The above-mentioned soft composite sheet (A) is mainly used as a waterproof sheet such as a rooftop on a building roof or a veranda. For this construction, for example, after fixing the joint pieces in an appropriate arrangement using an open leg nail or the like on the lower ground of the building body, a composite sheet (A) is laid, and the above-described joint is performed only at necessary portions including the peripheral portion thereof. The piece is partially joined and integrated using an organic solvent or a hot welder, and the other part is left free to complete the construction.

<Example> An example of a warp knitted net fabric having the following structural specifications as a fiber reinforcing material was sandwiched between two soft polyvinyl chloride resin sheets having a thickness of 0.75 mm, and bonded and integrated by heating and pressing. Thus, a soft composite sheet having a thickness of 1.5 mm was obtained.

[Fiber reinforcing material] Type: As shown in FIG. 4 Fiber: Polyester multifilament yarn Thickness: Weft insertion yarn 500 denier (9 filaments)
6) ground warp and entangled warp 50 denier (2 filaments)
4) Density: weft insertion yarn 8 / inch Comparative Examples 1 and 2 A composite sheet (comparative example) having the same configuration as that of Example 1 except that a mesh-like woven fabric having the following configuration specifications was used as a fiber reinforcing material. 1) and a homogeneous sheet of a vinyl chloride resin without using a fiber reinforcing material (Comparative Example 2).

[Mesh-like woven fabric] Fiber: polyester multifilament yarn, 500 denier (48 filaments) Texture: woven weave Density: warp weft 8 / inch each

Comparison of Strength Characteristics The relationship between the elongation and the tensile strength of the composite sheet according to the example, the composite sheet according to Comparative Example 1, and the homogeneous sheet according to Comparative Example 2 were measured and compared with each other. It was as shown in the SS curve shown in FIG.

As can be seen from the figure, the composite sheet according to the embodiment of the present invention has the same excellent strength as the composite sheet of Comparative Example 1 equivalent to the conventional product, but has the same strength as the composite sheet. It was confirmed that there was no sudden change in stress due to fracture of the steel sheet, and that it exhibited more excellent uniform strength characteristics.

[0035]

The soft composite sheet according to claim 1 of the present invention is characterized in that the warp knitted net fabric used as a reinforcing material is formed by combining a conventional woven fabric with warp insertion yarns and weft insertion yarns arranged in a vertical and horizontal lattice. In addition to exhibiting the same reinforcing effect as when used, even if these weft insertion yarns break for any reason, the ground knitting warp and the entangled warp in the ground knitting structure connected to them are Involves the reinforcing action to prevent a sudden large stress load from being applied to the base material sheet. For this reason, the occurrence of cracks in the composite sheet due to the above-described causes can be prevented, and reliability can be improved.

Further, since the warp insertion yarns and the weft insertion yarns arranged in a lattice are connected and held by the ground knitting structure by warp knitting, the ground knitting structure has relatively free elasticity. Together with this, there is room for relatively free displacement without being restrained by each other. For this reason, when manufacturing a composite sheet, the warp-insertion yarn and the weft-insertion yarn do not exhibit a large resistance to the strain stress generated inside the resin layer during lamination with the soft resin in the base material sheet. , And absorbs the stress to prevent wrinkles from occurring in the reinforcing material and prevent the composite sheet from being damaged in surface smoothness. Therefore, it is easy to produce a high-quality composite sheet.

According to the second aspect of the invention, in addition to the above, a necessary and sufficient high reinforcing effect in the vertical and horizontal directions of the composite sheet can be reliably provided.

According to the third aspect of the present invention, the thickness of the reinforcing material can be made extremely thin, and unevenness due to the effect of the fiber reinforced sheet appears on the surface even in a thin composite sheet. It is possible to easily obtain a fiber-reinforced composite sheet having no appearance and excellent appearance quality.

According to the fourth aspect of the present invention, while ensuring a sufficient reinforcing effect by the weft insertion yarn, a sufficient opening is provided between the insertion yarns, so that the upper and lower resin layers can be integrated well. Can be measured.

Further, the composite sheet according to the fifth aspect is more preferable in that a reinforcing material having a low elongation and a high elastic modulus can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a flexible composite sheet according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the composite sheet of FIG.

FIG. 3 is a plan view of a part of a reinforcing material used in the composite sheet of FIG.

4 is a structural diagram of a reinforcing material used in the composite sheet of FIG. 1;

FIG. 5 is an SS curve graph showing the relationship between strength and elongation of the composite sheet according to the example and the composite sheets and the homogeneous sheets according to Comparative Examples 1 and 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Soft base material sheet 2 ... Fiber reinforcing material 3 ... Warp insertion yarn 4 ... Weft insertion yarn 5 ... Ground knitting warp 6 ... Entanglement warp 7 ... Through hole 12 ... Warp knitting net fabric

Claims (5)

[Claims] 1. A soft synthetic resin composite sheet in which a fiber reinforcing material is embedded in an intermediate portion of a thickness of a soft base material sheet made of a soft synthetic resin or rubber as a base material, wherein the fiber reinforcing material is non-twisted or Warp insertion yarns and weft insertion yarns composed of low twist number tensile long fibers are arranged in a vertical and horizontal lattice,
A soft synthetic resin composite sheet comprising a warp knitted net formed by connecting these weft insertion yarns with a ground knitting warp having a fine warp knitting structure and an entangled warp to form a net. 2. A warp insertion yarn and a weft insertion yarn, wherein
2. A 1 denier multifilament yarn.
4. The soft synthetic resin composite sheet according to item 1. 3. The plain knit warp and the entangled warp have a length of 25 to 100.
3. The flexible synthetic resin composite sheet according to claim 1, comprising a denier tensile fiber multifilament yarn. 4. The flexible synthetic resin composite sheet according to claim 1, wherein the warp insertion yarn and the weft insertion yarn have a weft arrangement density of 7 to 12 yarns / inch. 5. The soft synthetic resin composite sheet according to claim 1, wherein each of the weft insertion yarn, the ground knitting warp, and the entanglement warp are made of polyester fibers.