JP2003129366A - Netlike base fabric and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both a netlike base fabric having a high intersecting point adhesive strength in a crossing part and a stable net shape and capable of readily carrying out lamination and integration with a sheetlike material and a method for producing the same. SOLUTION: This method for producing the netlike base fabric made of synthetic fibers is carried out as follows. Core-sheath conjugated yarns containing a thermally fusible resin as a sheath and a resin having a higher melting point than that of the thermally fusible resin by >=30 deg.C as a core are used as at least one of a warp yarn group and a weft yarn group. Two or more layers of the warp yarn group arranged in the sheetlike state and the weft yarn group arranged in the sheetlike state are alternately laminated on form a netlike laminate. The resultant laminate is then heated at a lower temperature than the melting point of the core resin to bond the warp yarn group and the weft yarn group which are thermocompression bonded by thermally fusing actions of the sheath resin. The netlike base fabric is obtained by the method. A laminated composite is prepared by bonding and laminating the netlike base fabric to one surface of the formed sheetlike material or between the two sheetlike materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic fiber net-like base cloth, a method for producing the same, and a laminated composite having the net-like base cloth as a part of its constituent layers.

[0002]

2. Description of the Related Art A conventional net-like material uses yarns as constituent elements. 1) Woven fabrics: warp yarns and weft yarns intersect each other at right angles to form a plane (eg, FIG. 1), 2) Knitting: One or more yarns make a loop,
There is one that hooks on the loop and continues to make a new loop, and successively loops on the plane (eg, FIG. 2). In addition to the above construction method, 3) attach an adhesive to the knitting / fabric to increase the adhesive strength at the intersection,
Those that prevent misalignment or have improved adhesion with other materials, 4) Wrap a heat-sealing thread around the weft and / or warp to be used, or attach a thermoplastic resin to the thread, and use this thread Use it to make knits and fabrics, heat it and glue the intersections together,
Interlacing points with increased misalignment and adhesiveness at the intersection points. 5) Interlocking points of knitting / fabric using heat fusion yarns (blended, mixed, core-sheath type composite yarns) in which the yarns used are compounded with materials with different melting points. By heat-sealing to increase the adhesive strength at the intersection and prevent misalignment (Japanese Patent Laid-Open No. 8-23796,
Japanese Patent Laid-Open No. 10-44273, etc.).

Further, those having a plane configuration different from that of the above knitting / fabric (eg, 6 as FIGS. 6 (a) and 6 (b)), a warp group arranged in a sheet and a weft group arranged in a sheet. Two or more layers are alternately laminated to form a base cloth,
An adhesive base cloth impregnated with an adhesive and heated and dried (Japanese Patent Laid-Open No. 46-
40505 published), 7) A thermoplastic resin is applied to the surface of both or either of the warp and weft groups of 6) above, and these are heated to form an integrated base fabric (JP-A-58-180657). ), 8) Using a yarn obtained by covering the warp yarn and the weft yarn or both yarns described above in 6) with a heat-sealing yarn, and heating these to integrate them into a base fabric (JP-A-63-6636).
2), there is.

[0004] These net-like materials are used alone for insect repellent nets, filters, etc., as reinforcements for laminated products such as synthetic resin films and papers, and as fiber structures of fiber-reinforced materials such as FRP, carpets, porcelain tiles or It is used as a facing material for wooden floor tiles and as a screen for windows.

In the case of the above-mentioned conventional net-like material, there were the following problems in the obtained net-like product and its manufacturing method. 1) Since the intersections are not fixed in the conventional knitting / fabric, misalignment is likely to occur, and the opening area / shape is not constant. 2) With conventional knitting / fabric, the net is too soft, and it is difficult to operate when it is evenly attached to a flat surface. 3) In the case of woven fabrics and knitted fabrics, when impregnating a resin for preventing misalignment and as a measure for softening, once the net is formed,
Drying requires two steps. 4) In the woven fabric and the knitted fabric, there is a variation in the thickness direction between the portion where the yarns overlap and the portion other than that, and especially when laminated on a film or the like, surface irregularities are noticeable. 5) A woven fabric having a coarse yarn interval cannot be accurately manufactured. In addition, since the yarn moves at the intersections of the weave in a densely woven fabric, an accurate mesh structure cannot be obtained. 6) In the conventional woven fabric, due to its structure, the warp yarn is bent up and down with respect to the woven fabric plane by the thickness of the weft yarn at the design point, and the angle with respect to the force applied in parallel to the basic constituent face. Since it will be supported by the warp having a twist (Fig. 3), stress concentrates and the strength decreases.

7) A resin-containing liquid is used in a method of impregnating / adhering an adhesive in a net in which two or more sheets of warp yarns and weft yarns having a non-woven or knitting structure are laminated and integrated. Therefore, a device for drying is required, which limits the drying time. 8) In the manufacturing method of 7) above, it is necessary for the thread and the resin to adhere. Therefore, when the yarn is olefinic, the adhesive force between the resin and the yarn surface is weakened, and the net intersection is likely to come off,
Alternatively, the adhesive is limited (Japanese Patent Laid-Open No. 11-137112).
application). 9) In the manufacturing method of the above 7), when the yarn is covered with the heat-sealing yarn, or when the yarn is impregnated with and adhered with a thermoplastic resin, a process for pretreating the yarn is required in addition to the net manufacturing process. Alternatively, only the wefts are arranged in parallel first, the resin is impregnated, and then the drying step is required, such as drying, and the apparatus becomes large. 10) In the case of forming a net using olefinic yarn by the production method of 7) above and compositing it with an olefinic sheet (film, non-woven fabric, etc.), it is inferior to the adhesion of olefins due to the interposition of resin. . 11) In the manufacturing method of 7) above, when a monofilament is used for the weft, a loop is drawn at the end of the net and folded in order to continuously insert the weft before adhering the intersection points with resin or the like. However, the weft thread cannot be inserted at equal intervals due to the force of the descended thread to return straight.

12) When a woven fabric is pasted on one side of the film or between two sheet-like materials for reinforcement, the warp is bent due to the thickness of the weft at the intersection, and the thickness is increased.
There are problems such as conspicuous irregularities in the surface morphology and that the tensile strength in the machine direction is lower than the original strength of the yarn. 13) When the net using resin for sealing is stuck on one side as a reinforcement of the film in the manufacturing method of 7) above, especially in the configuration of FIG. 6 (a), the upper warp has a small adhesive surface with the film, Moreover, since it is not covered with the weft, it is easily peeled off from the film. 14) In the method of using a resin as the cross point adhesive of the net and the knitting / fabric of the above 7), when wound as a roll after bonding, the unwinding between the nets is difficult depending on the blending of the resin, resulting in unwinding failure. There is. In addition, if a new chemical agent is added to the resin to prevent this, the adhesiveness to the target material may decrease. Further, when the release film is inserted between the nets, the winding diameter becomes large, and it is necessary to separately remove the release film at the time of use, which is troublesome.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems in the conventional net-shaped material and its production, and to obtain a sheet-shaped article having a high cross point adhesive force at the intersection and a stable net shape. And a net-like material that can be easily laminated and integrated with.

[0009]

According to the present invention, a warp yarn group arranged in a sheet form and a weft yarn group arranged in a sheet form are alternately laminated in two layers or three or more layers to form a net shape. A base fabric, wherein at least one of the warp group and the weft group is composed of a composite heat-fusible fiber containing fibers made of at least two kinds of resins having different melting points, and the warp group and the weft group have a low melting point. The present invention relates to a synthetic fiber net-shaped base cloth, which is formed by bonding a resin by heat fusion.
In particular, the present invention relates to the above-mentioned synthetic fiber net-like base fabric, in which the composite heat-fusible fiber is a core-sheath type composite yarn whose sheath is a heat-fusible resin having a lower melting point than the core component resin. Especially also
The present invention relates to the synthetic fibrous net according to any one of the above, wherein the difference in melting point between two or more kinds of resins having different melting points forming the composite heat-fusible fiber is 30 ° C. or more. The present invention also relates to a laminated composite body in which the net-like base fabric described in any of the above is adhesively laminated on one side of a sheet-like material or between two sheet-like materials. In addition, the present invention is a composite heat-fusible fiber in which at least one of a warp group and a weft group includes fibers made of at least two kinds of resins having different melting points, and the warp yarns are arranged in a sheet shape. Characterized in that two or more groups of wefts arranged in groups and sheets are alternately laminated to form a net-like laminate, and the laminate is heated at a temperature lower than the melting point of the resin having the highest melting point. The present invention relates to a method for manufacturing the synthetic resin net-shaped base cloth.

The present invention is based on the recognition that it is difficult to solve all of the above problems 1) to 6) by using a weaving / knitting net construction method.
This is a method of adopting a net structure other than knitting, that is, a method of alternately laminating two or more layers of warp yarns and weft yarns and integrating them. This allows knitting
The problems specific to textiles have been solved. The above invention provides many features and advantages as follows. 1) It is a flat net-like base cloth in which the warp is not bent, and even when it is combined with a film or the like, the surface unevenness and the thickness are smaller than those of knitted or woven fabrics. 2) Since the opening area of the net-like base cloth is larger than that of the woven cloth,
A net-like base fabric with excellent ventilation and permeability. 3) Since the opening area of the net-like base cloth is larger than that of the woven cloth,
When sandwiched by thermoplastic films on the top and bottom and integrated, the upper and lower films easily contact and integrate, so the reinforcing effect is high. 4) Since the opening area of the net-like base cloth is larger than that of the woven cloth,
When embedding in concrete or soil, the matrix particles come into contact with each other at the opening of the net, which facilitates integration and enhances the reinforcing effect. 5) Since the net-shaped base fabric is formed by using the heat-fusible yarn for both warp yarns and weft yarns, or at least one of the warp yarns, the cross-point adhesive strength is high, and a stable net-shaped base fabric can be formed.

6) Although there are few adhesives having high adhesiveness to olefin fibers, since the olefin heat fusion yarn is used, the composite yarn of the present invention is made of olefin fibers and has a stable morphological net-like base cloth. Can be formed. 7) By using the composite yarn whose surface is an olefin resin, it is possible to manufacture a laminated composite having high adhesion and less unevenness even when it is combined with an olefin sheet or the like. 8) In the conventional net-like material, the net was easily peeled off in a single-area layer with a sheet or film, but the net-like base fabric of the present invention can be bonded to one surface of an olefin-based sheet / film to exert a reinforcing effect. 9) When the PET sheet / film is net-reinforced, the PET-based composite yarn net-like base fabric of the present invention is used as the heat-sealing yarn without using a special adhesive resin having excellent adhesiveness with PET. If used, a net-like base cloth with little unevenness and high yarn reinforcing effect can be obtained. 10) By using the heat-fusible yarn, the drying process as in the case of using the resin dispersion liquid is eliminated, and the manufacturing time can be shortened with a device having a lower heat capacity. 11) The amount of heat required for heating can be obtained only by heat-sealing the low melting point component of the yarn, and since it is less than when a water-soluble resin is used, a heat source with a small capacity is sufficient, so the device is small and the production speed can be increased. it can. 12) It is possible to manufacture a net-like base cloth that makes full use of the physical properties of the surface material of the heat-fusible yarn (chemical resistance, recyclability, adhesion to the same material, etc.). 13) By using the heat-fusible yarn, even a multi-filament is integrated like FRP when heated, so that a net-like base fabric having appropriate flexibility without being too soft can be obtained.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the net-like base cloth of the present invention, two or more components having different melting points are combined as a net constituent yarn (core-sheath,
Blended or mixed) fibers (multifilaments, monofilaments or spans) are used. In this case, this composite heat-fusible fiber may be used for both warp and / or weft. In the present invention, the most preferable form of the composite heat-fusible fiber is a sheath-core composite yarn having a heat-fusible resin as a sheath and a resin having a melting point higher than that of the heat-fusible resin by 30 ° C. or more as a core. .

Examples of the sheath-core type composite yarn suitable for use in the present invention include polypropylene (core) / polyethylene (sheath),
Examples thereof include polypropylene (core) / low melting point polypropylene (sheath) or polyethylene terephthalate (core) / low melting point polyethylene terephthalate (sheath). However, it is not limited to these.

The net of the present invention comprises a warp group and a weft group which are laminated and the warp and the weft are bonded at the intersections thereof.
It is laminated in layers or more. In the case of a net having a laminated structure of three or more layers, vertically overlapping warp threads or weft threads may overlap at the same vertical position as shown in FIG. 6 (a), or as shown in FIG. 6 (b), for example, It may be offset by 1/2 pitch.

The spacing between the wefts of the net is 0.1 to 8 threads / c
m, preferably 0.2-4 lines / cm. The warp spacing is 0.1 to 10 yarns / cm, preferably 0.2 to 4 yarns / cm
Is. The opening size of the net of the present invention is 2.0 to 100.0.
mm and fully open. Therefore, the upper and lower films can be easily contacted and integrated when the upper and lower films are integrated with the net sandwiched between them, and the matrix particles are contacted at the openings of the net when embedded in concrete or soil, so the integration is easy. And an excellent reinforcing effect can be obtained.
Moreover, despite the large opening size,
Since the intersection of the warp and the weft is sufficiently adhered, the net structure is stably maintained without breaking. This is one of the features of the net of the present invention.

The net of the present invention can be used as a reinforcing material to form a laminated composite yarn on one side of a sheet-like material or by sandwiching it between a plurality of sheet-like materials. An adhesive is not necessarily required to form a laminated composite yarn using the net of the present invention, and after the sheet-like material and the net are superposed, the temperature is higher than the heat fusion temperature of the sheath material of the composite yarn constituting the net. A strong bond can be formed between the sheet and the net only by applying pressure at a high temperature. Further, if a heat-fusible resin is similarly provided on the side of the sheet-like material that comes into contact with the net by laminating or the like, the adhesion to the net becomes more reliable.

In the case of a laminated body using a conventional net-like material,
Since the net is exposed in the laminated body in which the net is laminated only on one surface of the sheet, the problem that the net is peeled off or the fibers are fluffed is unavoidable, but the laminate obtained by using the net of the present invention In the sheet, the net is firmly adhered to the sheet even if it is a two-layer laminated body as described above, and therefore the above-mentioned peeling and fluffing hardly occur.

As such a laminated body, for example, in the case of a composite yarn using a polyolefin resin as a sheath material of the composite yarn, PE sheet / net, PE sheet / net /
In the case of a PE sheet, a PP sheet / net, a PP sheet / net / PP sheet, and a composite yarn using a PET resin as a sheath material of the composite yarn, a PET sheet / net and a PET sheet / net / PET sheet can be exemplified. Here, PE, PP, and PET are abbreviations for polyethylene, polypropylene, and polyethylene terephthalate, respectively.

The net of the present invention uses a sheath-core type composite yarn in which the heat-fusible resin described above is used as the sheath and the resin having a melting point higher than that of the heat-fusible resin by 30 ° C. is used as the core. It can be manufactured in this manner. That is, two or more layers of warp yarns arranged in a sheet and weft yarns arranged in a sheet formed of the above composite yarns are alternately laminated and integrated into a base fabric, and the laminate is formed at a temperature lower than the melting temperature of the core resin. It can be manufactured by applying heat and pressure bonding. According to the above-described production method of the present invention, the heat-sealing resin portions of the warp yarn and the weft yarn sheath portion are fused with each other by this thermocompression bonding, or the heat-sealing resin portion of one yarn sheath portion bites into the other fiber. It is possible to reduce the thickness by firmly adhering to each other and compressing the overlap at the intersection. In the present invention, it is not always necessary to use the core-sheath type composite yarn for both the warp group and the weft group, and if the core-sheath type composite yarn is used for one of the warp group and the weft group, the other Threads capable of adhering to the heat-fusible sheath-constituting resin may be used.

Further, when a monofilament is used for the weft yarn, in the conventional method, the net structure is apt to be disturbed in the loop portion where the warp yarn is inverted due to the high rigidity of the yarn. Therefore, in the present invention, in the case of a monofilament, the loop shape is formed by heating the fiber to a temperature not lower than the melting point of the low melting point component and not higher than the melting point of the high melting point component in the section where the loop portion is formed and held. The mesh structure can be retained up to the heating roll even after passing through the loop forming / holding section. Hot air or a heater can be used to heat this portion. By this method, it is possible to perform heat fusion at a constant weft interval and then heat the entire intersection to heat fuse.

[0021]

The present invention will be described in more detail and specifically below with reference to Examples. Example 1 Olefin-based heat-sealing fiber "Pyrene" as a heat-sealing yarn
[Made by Mitsubishi Rayon Co., Ltd .; core-sheath composite yarn (core: melting point 160
℃ polypropylene, sheath: polyethylene with a melting point of 98 ℃)
680d multifilament] was used for the warp and the weft to produce a synthetic fiber net-like base cloth as follows.
The device used was that shown in FIG. The warp group 1 (upper thread) arranged in a sheet form has a thread interval of 2 cm, the similar sheet warp group 2 (bottom thread) has a thread interval of 2 cm, and the sheet weft group has a thread interval of 1 cm. As shown in b), that is, the warp yarns above and below the weft yarns are laminated so that the upper yarns and the lower yarns are displaced by 1/2 pitch. After stacking on the original shape of the net,
Two heating rolls heated to 100 ° C. were passed through and tension was applied to the warp to integrate the warp and the weft. The net-like base fabric thus produced has a surface material of polyethylene, and the cross point adhesive force can sufficiently retain the shape of the net. Further, the produced net-like base cloth was wound up as a roll, but when unwound from the roll, the separation between the net-like base cloths was good and the net-like base cloth was easily pulled out. The cross-point adhesive force between the warp and the weft of the obtained net-like base cloth is about 1.8.
It was N. The thickness of the net-like base cloth at the intersection is 0.2.
It was 6 mm.

The cross point adhesive force is measured as follows. [Measurement method of cross point adhesive strength of net-like base cloth] Cut out the net-like base cloth to a certain size, and grip the warp on one side of the autograph, and the weft directly adhered to the warp on the other side of the autograph. Let it grip. 200 mm /
The adhesive force at the intersection is measured by pulling at a constant speed of min.

Example 2 A net prototype laminate produced in the same manner as in Example 1 was
Heating and compression with two heating rolls heated to 00 ° C (linear pressure:
1 to 3 kg / cm) to integrally bond.
The net material produced in this way has a surface material of polyethylene, has a higher adhesive strength at the intersection point than in Example 1, and the yarn is flattened, so the thickness of the intersection point is 0.12 mm, which is twice the thickness of the yarn. A thinner net having less unevenness was obtained. In addition, peeling between the nets of the scroll was easy. Further, the adhesive force at the intersection of the nets was 3.0 N.

Example 3 "Pyrene" as a heat-sealing yarn for a warp [manufactured by Mitsubishi Rayon Co .; core-sheath structure composite yarn (core: polypropylene having a melting point of 160 ° C, sheath: polyethylene having a melting point of 98 ° C), 680d multifilament] For the weft, "Pyrene" (manufactured by Mitsubishi Rayon Co., Ltd .; polypropylene with a melting point of 160 ° C, 340d
The original net of the type shown in FIG. 6B was laminated in the same manner as in Example 2 except that the multifilament of No. 1) was used. This laminate was thermocompression bonded in the same manner as in Example 2 to produce a net. In the net, polyethylene in the sheath portion of the warp was melted and adhered to the weft polypropylene yarn at the intersection. As a result, the weft was able to form a flexible net that retains the properties of multifilaments. In addition, peeling between the nets of the scroll was easy.

Example 4 500 d monofilament yarn of "ES fiber yarn" [manufactured by Chisso Co .; core-sheath structure composite yarn (core: polypropylene having a melting point of 170 ° C., sheath: polypropylene having a melting point of 130 ° C.)] as a heat-sealing yarn Was used for the warp and the weft. A laminated body of the type shown in FIG. 6B was prepared in the same manner as in Example 1. In this case, the weft yarns are arranged at equal intervals by spanning between coil-shaped setting jigs installed at the ends, and hot air of about 130 ° C. is applied to the loop portion formed by the weft yarns at the coiled jig portion to form a loop. The shape was fixed. The obtained net prototype laminate was
The mixture was passed through rolls heated to ℃ and heat-pressed to form a net, which was integrated. Further, in the net roll, the nets were not adhered to each other and the nets were easily separated. This net is more elastic than the net obtained from multifilaments, and has the characteristic that it can be processed into a pleat shape at 130 ° C. and cooled to fix the shape.

Comparative Example 1 "Pyrene" for warp and weft (manufactured by Mitsubishi Rayon; polypropylene multifilament having a melting point of 160 ° C .; 68)
0d) was used, and the same procedure as in Example 1 was performed, as shown in FIG.
A laminated body, which is a net original shape of the above structure, was manufactured. afterwards,
The net-shaped laminate was heated and compressed by a roll heated to 160 to 170 ° C. to be integrated. In this manufacturing process, the warp was cut in the heating part and the net could not be manufactured.

Comparative Example 2 Using the heat-bonding yarn "Pyrene" (manufactured by Mitsubishi Rayon, multifilament) used in Example 1 as a warp and a weft, a weft is prepared at an interval of 1 / cm on a normal loom. However, wefts slipped between the warp yarns during the weaving operation, and a net having a constant warp interval could not be obtained.

Example 5 The net prepared in Example 2 was placed on one side of a polyethylene film (thickness: 0.08 mm), and a laminator (temperature 100 ° C., linear pressure 2.5 kg / cm) was used at a speed of 5 m / min. When heated and compressed, the yarns of the film and the net were integrated, and the warp yarns and the weft yarns constituting the net were adhered so that they could not be separated.

[0029]

According to the method for producing a net of the present invention, since it is not necessary to use an adhesive, a net made of a suitable polyolefin fiber without an adhesive can be easily obtained, and the produced net made of synthetic fiber is It has the following characteristics: 1) The warp and weft are strongly bonded, and therefore the net structure is stable unlike woven and knitted fabrics. 2) It is lightweight because no adhesive is used. 3) The net is relatively smooth and has no unevenness like woven or knitted goods, and in addition, the net mesh is wide, so when a composite is formed using this as a reinforcing material, the upper and lower matrices of the net can be well integrated. it can. 4) Since there are few irregularities and it is made of heat-fusible fiber, it has excellent heat-fusion property with an olefinic sheet, and the adhesive strength is excellent only by laminating and fusing the sheets on only one side of the net. A laminate is obtained. In addition, the manufacturing method of the present invention has high productivity because it does not use a wet adhesive and thus does not require a drying step and thus does not have a rate-determining step called a drying time.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of a typical plain weave fabric. (A) plan view, (b) XX sectional view in (a),
7C is a sectional view taken along line YY in FIG.

FIG. 2 is a schematic plan view showing the structure of a typical flat knitted fabric.

FIG. 3 is a schematic diagram of a state in which a warp is bent by a weft.

FIG. 4 is an explanatory view of a conventional net manufacturing process.

FIG. 5 is an explanatory diagram of a net manufacturing process of the present invention.

FIG. 6 is a cross-sectional view of a three-layer net according to the present invention, (a) a net at a position where upper and lower yarns of a warp overlap each other, and (b) a net at a position where upper and lower yarns of a warp are displaced by ½ pitch.

[Explanation of symbols]

1, 1 ': warp, 2, 2 ': a warp group warped into a sheet, 3: Weft, 4: Net-shaped laminated yarn composed of integrated warp and weft, 5: Net wound up, 6: Creel stand, 7: hot roll for melting, 8: Adhesive impregnation tank, 9: Drying roll.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuya Kusunoki             2-3-4 Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Prefecture             Issue Kurashiki Spinning Co., Ltd.Osaka headquarters (72) Inventor Keiichi Maekawa             2-3-4 Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Prefecture             Issue Kurashiki Spinning Co., Ltd.Osaka headquarters F term (reference) 4F100 AK04A AK07A AK42A AT00B                       AT00C BA02 BA03 BA10B                       BA10C DC15A DG14A DG20A                       JA04A JK06 JL03 JL12A                       YY00A                 4L047 AA14 AA21 AA27 BA09 BB01                       BB06 BB09 BD03 CA03 CA06                       CB01 CB09 CB10

Claims (8)

[Claims] 1. A net-like base cloth formed by alternately laminating two or three or more layers of a warp group arranged in a sheet and a weft group arranged in a sheet, the warp group comprising: Alternatively, at least one of the weft yarn groups is made of a composite heat-fusible fiber containing fibers made of at least two kinds of resins having different melting points, and the warp yarn group and the weft yarn group are bonded by the heat-sealing action of the low melting point resin. A net-like base cloth made of synthetic fiber, which is characterized in that 2. The synthetic fiber net-like base fabric according to claim 1, wherein the composite heat-fusible fiber is a core-sheath composite yarn having a heat-fusible resin having a melting point lower than that of the core component resin as a sheath. . 3. The synthetic fiber net according to claim 1, wherein the melting point difference between two or more kinds of resins having different melting points constituting the composite heat-fusible fiber is 30 ° C. or more. 4. One of the warp yarn and the weft yarn is polypropylene.
(Core) / polyethylene (sheath), polypropylene (core) / low melting point polypropylene (sheath) or polyethylene terephthalate
(Core) / low melting point polyethylene terephthalate (sheath), which is a sheath-core type composite yarn, wherein the other yarn is a core-sheath type composite yarn composed of the same type of resin composition or a resin forming the sheath of the composite yarn. The synthetic fiber net-like base cloth according to claim 2 or 3, which is made of a single resin fiber made of a resin that can be attached. 5. A net opening size of 2.0 to 10.0 m
The synthetic fiber net-like base cloth according to any one of claims 1 to 4, wherein m is m. 6. A laminated composite body in which the net-like base cloth according to any one of claims 1 to 5 is adhesively laminated on one side of two sheet-like materials or between two sheet-like materials. 7. A composite heat-fusible fiber in which at least one of a warp group and a weft group includes fibers made of at least two kinds of resins having different melting points, and the warp group arranged in a sheet form. 2. A net-shaped laminate is formed by alternately laminating two or more weft yarn groups arranged in a sheet shape, and heating the laminate at a temperature lower than the melting point of the resin having the highest melting point. 7. The method for producing a synthetic resin net-like base cloth according to any one of 1 to 6. 8. The synthesis according to claim 6, wherein the composite heat-fusible fiber is a core-sheath composite yarn having a resin sheath made of a heat-fusible resin having a melting point of 30 ° C. or more lower than that of the core component fiber. A method for producing a fibrous net-like base cloth.