JP4896685B2 - Anti-stain industrial fabric - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a manufacturing process for a papermaking fabric, a nonwoven fabric manufacturing fabric, a building material manufacturing fabric, and the like, and an industrial fabric used as a filter for a conveyor belt, a filter cloth and the like.

  Conventionally, a woven fabric woven with warp and weft has been used as a manufacturing process for papermaking, non-woven fabrics, building materials and the like, as well as for transportation and as a filter. In any application, rigidity, dimensional stability, antifouling properties, etc. are required. Rigidity is necessary when holding and transporting objects such as raw materials and floating components, and is essential when handling heavy raw materials and floating components particularly in building material manufacturing processes and filter applications. In addition, dimensional stability is always necessary for stable running, and antifouling is necessary to constantly supply paper, non-woven fabric, and building materials as products of stable quality, and to perform efficient filtration and transportation. It is also important.

In recent years, development of yarns, resins, and the like specifically aimed at antifouling effects has been promoted. For example, as one of the textiles for antifouling effect, a fluoropolymer such as ethylene-tetrafluoroethylene copolymer (hereinafter also referred to as “ETFE”) and polyethylene terephthalate (hereinafter also referred to as “PET”). And the like, and a technology relating to a woven fabric using the yarn formed by blending with an aromatic dicarboxylic acid polymer (see Patent Document 1).
Conventionally, fluororesins have been widely used in antifouling applications because they have excellent antifouling properties. However, since the fabric used in the present invention is for industrial use, in addition to the antifouling effect, breaking strength and tensile strength Etc. were necessary. However, it has been difficult to obtain a sufficient strength when a woven fabric woven only with ETFE or the like is used in a building material application having a low rigidity and a heavy raw material.

  Further, in order to improve the rigidity, it is only necessary to increase the blending of a rigid polymer such as PET. On the other hand, in order to improve the antifouling property, it is sufficient to blend a large amount of a fluororesin. Therefore, there is a contradictory relationship between rigidity and antifouling properties, and it has been pointed out that it is difficult to sufficiently obtain both rigidity and antifouling properties required for industrial fabrics.

In addition, a technology relating to a papermaking fabric obtained by applying at least two types of resins among a fluorine-based resin, a silicon-based resin, and an epoxy-based resin to the yarn surface of the fabric is disclosed (see Patent Document 2). However, with this woven fabric, as the period of use increases, it is feared that the resin film will be peeled off by a high pressure shower such as removal of dirt, and it is expected that it is difficult to maintain the antifouling effect for a long time.
In addition, a technology relating to a filter cloth for a belt press sludge dehydrator using a composite yarn formed by winding a synthetic resin fiber converging yarn on a core wire made of a synthetic resin monofilament as a warp is disclosed (see Patent Document 3). . This filter cloth has a structure in which a fiber converging yarn having a high moisture absorption rate appears on the yarn surface, thereby allowing moisture to intervene on the surface of the fabric, thereby improving sludge releasability.
However, the composite yarn that is simply wound around the core yarn is easy to unravel, and loops are formed at the warp ends of the endless fabric, and when the endless fabric is formed by joining them endlessly, It is difficult to form and process by joining the end portions, and there is a concern that sufficient rigidity cannot be obtained in terms of loop strength.
Japanese Patent Laid-Open No. 11-189947 JP-A-57-171790 Japanese Utility Model Publication No. 1-61912

  By using a composite yarn with a silicone or fluorine resin coating formed, it prevents the winding member from coming apart, and provides a woven fabric with excellent antifouling properties and rigidity that are in conflict with each other and with excellent weaving properties. An object of the present invention is to provide an antifouling industrial fabric that maintains its antifouling effect without peeling off the resin coating until the end of the use of the fabric.

The present inventor rubs a wound member for increasing the surface area of a synthetic resin filament core wire in a fabric used for manufacturing processes, transport applications, and filter applications of papermaking, non-woven fabric, building materials, etc. Alternatively, it was found that by using a composite yarn having a fluororesin film formed thereon, the antifouling effect was maintained until the end of the use of the fabric without peeling off the resin film, and the weaving property and rigidity were improved. Therefore, the present invention employs the following configuration in order to solve the above problems.
(1) In the antifouling industrial fabric, the antifouling composite yarn is disposed in a part of the fabric, the antifouling composite yarn is a monofilament core wire, a winding member wound around the core wire, and an outer side is composed of three layers of stacked resin film on the resin film is a antifouling industrial fabric, characterized by being formed me by the sheet recone or fluorine resin.
(2) The winding member is made of any one of polyethylene terephthalate (PET), polyetheretherketone (hereinafter referred to as “PEEK”), and polyphenylene sulfide (hereinafter referred to as “PPS”). The anti-stain industrial fabric described in (1) above.

(3) The antifouling industrial fabric according to (1) or (2), wherein the wound member is any one of a monofilament, a multifilament, and a non-woven fiber.
(4) The fluororesin is any one of ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene copolymer, perfluoroalkoxy, polyvinylidene fluoride, and tetrafluoroethylene-hexafluoropropylene copolymer. Or it is one or more of these, It is an antifouling industrial textile as described in any one of said (1) thru | or (3) characterized by the above-mentioned.
(5) The antifouling industrial fabric according to any one of (1) to (4), wherein the resin film formed on the surface of the wound member is 50 μm or more.
(6) Part or all of the warp is formed of the antifouling composite yarn, and the weft is woven from any one or more of monofilament, multifilament, and the antifouling composite yarn. (1) It is an antifouling industrial textile as described in any one of (5).
(7) Both ends of the warp, part or all of which are formed of an antifouling composite yarn, are formed as loop-shaped end portions, and the loop-shaped end portions formed at the both end portions are meshed to form a common hole. The anti-stain industrial fabric according to (6) above, which is formed and made endless by inserting a pin through the common hole.

  A member for increasing the surface area is wound around the monofilament core wire, and a composite yarn having a silicone or fluorine resin coating formed on the surface thereof is arranged on a part of the woven fabric to prevent the winding member from being unwound. By suppressing the peeling due to the use of the fabric, the antifouling effect is maintained until the end of the use of the fabric, and there is an effect of providing an antifouling industrial fabric excellent in weaving and rigidity.

An example of an embodiment of the present invention is shown below. However, the following description is an illustration and this invention is not limited to the following.
The woven fabric of the present invention is used in many industrial applications, and in particular, used in the manufacturing process and conveying applications of papermaking, non-woven fabrics, building materials, etc., and in filter applications. This solves the ease of use.
The constituent yarn used in the present invention preferably has a monofilament such as PET, PEEK, PPS or the like as a core wire. Other members may be used for the core wire. Further, the winding member is not particularly limited, but it is particularly preferable to wind a winding member made of any one of PET, PEEK, and PPS around the core wire to obtain a composite yarn. The antifouling industrial fabric according to the present invention is one in which a resin film is formed on the surface of a composite yarn with silicone or fluorine resin, and the antifouling composite yarn is used as a part of the fabric and woven.

The material of the core wire and the material of the winding member may be the same or different. In consideration of rigidity, the core wire is monofilament, but the wound member is monofilament, multifilament, tape with a rough exposed surface (for example, non-woven fabric), span yarn, crimped or bulky, etc. Processed yarns called yarns, bulky yarns, stretch yarns, or yarns obtained by combining them together can be used.
Moreover, it is preferable that the winding member is densely wound in a coil shape along the outer peripheral surface of the core wire. Since the winding member is for improving the retention of the resin applied thereafter, other materials may be used as long as the surface area of the yarn can be increased. When the winding member is a rigid resin such as PET, PEEK, or PPS, it is preferable that the wound composite yarn is contracted and hard to be displaced by heat setting the wound composite yarn. The heat setting temperature may be determined according to each material. However, the heat setting does not weld the core wire or the winding member, but uses the heat shrinkage stress of the winding member to keep it as a composite yarn. Set taking into consideration.

FIG. 1 is a cross-sectional view of an antifouling composite yarn used in an antifouling industrial fabric according to the present invention. The core wire 1 of the antifouling composite yarn is made of a monofilament, and a winding member 2 is wound around the outer periphery thereof. Further, a resin film 3 is formed on the outer periphery of the winding member 2. Such a resin film is formed of a silicone resin or a fluorine resin. Here, as the silicone resin, silicone oil or the like is used, and specific examples include ORGATICS (manufactured by Matsumoto Pharmaceutical Co., Ltd.) which is a silicone coating agent. Further, as the fluorine-based resin, ETFE, PTFE, PFA (TEFLON PFA), PVDF, FEP, and the like can be used, and they may be mixed and used as necessary. These resins are excellent in chemical resistance in addition to antifouling properties.
In addition, since the composite yarn has a large surface area, the resin coating is difficult to peel off if a resin is applied on the composite yarn, and the resin coating can be maintained for a long time even under severe conditions such as industrial use. In addition, since the composite yarn is covered with the resin film, the winding member can be prevented from being unwound. Therefore, it became possible to maintain both rigidity and antifouling properties until the end of the use of the fabric. The thickness of the resin film formed on the surface of the composite yarn is not particularly limited. However, considering the resin film strength and wear, it may be 50 μm or more, and preferably 70 μm. Various methods can be used for forming the resin film. For example, the resin can be coated with surface tension and the wire diameter can be appropriately given by passing through a die.

  As a constitution of the woven fabric, the antifouling composite yarn may be used for either warp or weft. It may be used only for the warp, only the weft, or may be used for both the warp and the weft. For example, woven fabrics such as single warp single weft, single warp double weft, single warp triple triple, warp double weft double structure, etc. can be used, for example, anti-stained yarn for warp, monofilament for upper weft and lower weft It may be a woven fabric having a double structure of warp / single weft, a woven fabric having a double structure of warp / single weft using monofilaments for the lower weft and the warp / upper weft.

  In endless industrial fabrics, rigidity is required because tension is applied in the warp direction, but the antifouling composite yarn of the present invention is a monofilament with a rigid core wire, so it is under high tension. However, it can be suitably used as a warp. In addition, since endless industrial fabrics are not tensioned in the transverse direction, it is preferable in terms of cost to use ETFE monofilament or the like that has poor rigidity but excellent antifouling property for wefts.

  As materials other than the antifouling composite yarn constituting the woven fabric, polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetra Fluoroethylene, cotton, wool, metal, etc. can be used. Of course, you may use the thread | yarn which blended and contained various substances according to the objective to these copolymers or these materials. In addition to monofilament, multifilament, spun yarn, crimped or bulky processed yarn, textured yarn, bulky yarn, processed yarn called stretch yarn, or twisted yarns are also used. Combined yarns can be used. The cross-sectional shape of the yarn is not limited to a circle, and a short yarn such as a square shape or a star shape, an elliptical shape, or a hollow yarn can be used.

  The woven fabric may also be used as an endless shape by joining the ends of the end-shaped woven fabric, and of course, it may be used in the state of an end cut net. For example, when making a warp single weft double structure fabric using antifouling composite yarn, upper weft and monofilament as lower weft, weaving several wefts at the warp end of the fabric and removing the warp at that portion The end of the yarn is woven into the fabric along the fabric structure to form a loop-shaped end, and the loop-shaped end formed on both ends of the warp of the fabric is meshed to create a common hole, It is good also as an endless shape by inserting a pin. Similarly, a spiral coil may be attached to the warp loop, end coils may be engaged with each other to form a common hole, and a pin may be inserted therethrough to make the endless shape.

Examples of the present invention will be described in comparison with comparative examples.
Example 1
Using a polyester monofilament of 0.45 mm as a core wire, a polyester multifilament formed by twisting strands around it is wound to create a composite yarn, and ETFE resin is immersed in the composite yarn so that the film thickness becomes 70 μm An antifouling composite yarn having a diameter of 0.65 mm as shown in FIG. 1 was obtained by forming a resin film by coating and solidifying. This was used as a warp, and a single-layer woven fabric was prepared by arranging and weaving an ETFE monofilament having a diameter of 0.75 mm as a weft.

Comparative Example 1
A monolayer fabric was prepared by weaving a polyester monofilament having a diameter of 0.65 mm as a warp and an ETFE monofilament having a diameter of 0.75 mm as a weft.
Comparative Example 2
A single-layer woven fabric was prepared by arranging and weaving ETFE having a diameter of 0.65 mm as the warp and ETFE monofilament having a diameter of 0.75 mm as the weft.
Comparative Example 3
By using a polyester monofilament as a core wire and weaving an ETFE monofilament with a diameter of 0.75 mm as a weft, using an antifouling thread with a diameter of 0.65 mm formed by dip coating an ETFE resin film around it. A single layer fabric was made.

○ Antifouling property comparison test (peeling test of low melting point fiber)
A small mesh of plain mesh of 12 mm / inch of 50 mm × 50 mm is placed in the center of the sample, and a fixed amount (1.5 g) of molten fiber (polyethylene / polypropylene composite fiber) is placed on the fixed area (85 mm × 135 mm). In order to prevent the fibers from being blown off, a fluorine-based mesh sheet, a metal net, and a 6 kg weight were placed thereon, and placed in a 160 ° C. oven for 20 minutes to melt the molten fibers. Thereafter, a hook made of a spring was hooked on a small piece net placed between the molten fiber and the woven fabric, and the molten fiber integrated into a sheet shape was slowly lifted to measure the peeling stress of the molten fiber sheet. Each test was performed 6 times, and the average was taken as the peel stress. A larger numerical value means that the fiber sheet is more difficult to peel off. The small net was used as a support for lifting the melted fiber sheet.

Test result: peel stress measurement result, visually confirming the surface of the sample after the test In the peel test, Example 1 was 0 kg, Comparative Example 1 was 1.17 kg, and Comparative Examples 2 and 3 were 0 kg. In Example 1 and Comparative Examples 2 and 3, the fiber sheet was lifted without any sense of resistance. The difference is obvious, and even in visual observation, Example 1 has almost no melted fibers (see FIG. 2), but Conventional Example 1 has fibers in the form of cobwebs in places of polyester monofilament wefts as shown in FIG. It was confirmed that there was a residue attached. In Comparative Examples 2 and 3, the initial antifouling effect was the same level as in Example 1.

○ Antifouling effect sustainability comparison test Each sample was used in the nonwoven fabric production line, and the period of use at that time was compared. The usable period is when the nonwoven fabric fiber or chemical binder, etc. adheres to the surface of the fabric and the pattern of the product collapses, or dirt adheres to the product, making it impossible to produce a nonwoven fabric that is possible as a product level, or In the manufacturing process, when the fabric was stretched and running stability could not be ensured, etc., when the product and the manufacturing were in trouble, it was determined that it could not be handled.

O Stiffness comparison test Each sample was cut into the same width and length, and the elongation (%) at 7 kg / cm and 14 kg / cm per unit width was measured with a tensile tester.
Test results:
When each sample was actually used under the same conditions, Comparative Example 1 became unusable within the day because the melted fiber stuck to the polyester monofilament of warp from the beginning of use. In Comparative Example 2, the initial antifouling performance was good, but when the fabric was tensioned, the fabric was stretched and could not be stably run. In Comparative Example 3, the initial antifouling performance was good, but the antifouling effect was gradually lowered, and the coating resin of the antifouling composite yarn was gradually peeled off and sometimes mixed into the nonwoven fabric product.
On the other hand, Example 1 was able to be used suitably for 30 days or more without causing elongation and preventing the antifouling effect from being lowered.

  In the woven fabric of the present invention, when it is desired to further improve the rigidity, the diameter of the polyester monofilament of the core wire may be increased. Regarding the improvement in rigidity, the thickness of the winding does not affect that much, so the core wire can be thickened by making the winding portion thinner. In addition, the multifilament wound on the monofilament surface is intended to increase the surface area, and since the resin penetrates into the details of the multifilament and is difficult to peel off, the resin coating can be made relatively thin. If the resin film is at least 50 μm or more, preferably 70 μm or more, the film will not fall off.

Number of eyes: warp / weft (book / inch)

It is sectional drawing of the antifouling thread of this invention. 2 is a surface photograph of the fabric of Example 1. FIG. 6 is a surface photograph of a fabric of Conventional Example 1.

Explanation of symbols

1. Core wire 2. Winding member Resin coating

Claims (7)

In an antifouling industrial fabric, an antifouling composite yarn is arranged in a part of the fabric, and the antifouling composite yarn is laminated on the outer side with a core wire made of monofilament and a winding member wound around the core wire. It was is composed of three layers of resin film, antifouling industrial fabric, wherein the resin film is characterized in that it is formed me by the sheet recone or fluorine resin. 2. The antifouling industrial fabric according to claim 1, wherein the wound member is made of any one of polyethylene terephthalate, polyether ether ketone, and polyphenylene sulfide. The antifouling industrial fabric according to claim 1 or 2, wherein the wound member is any one of a monofilament, a multifilament, and a non-woven fiber. The fluororesin is any one or one of ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene copolymer, perfluoroalkoxy, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer. The antifouling industrial fabric according to any one of claims 1 to 3, which is a mixture of the above. The antifouling industrial fabric according to any one of claims 1 to 4, wherein the resin film formed on the surface of the wound member is 50 µm or more. A part or all of the warp is formed by the antifouling composite yarn, and the weft is woven from any one or more of a monofilament, a multifilament, and the antifouling composite yarn. 5. The antifouling industrial fabric according to any one of 5 above. Forming both ends of the warp part or all of the warp yarn formed by the antifouling composite yarn as a loop-shaped end portion, meshing the loop-shaped end portions formed at the both end portions to form a common hole, The anti-stain industrial fabric according to claim 6, wherein the common hole is endless by inserting a pin.