JP2003170548A - Sealing-up sheet of fabric textile sutured part or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sealing-up sheet used for sealing up a fabric textile sutured part of a filter cloth, a tent or the like and flexibly brought into close contact with the fabric textile by imparting good air permeability and heat resistance with non-adhesive properties, and to provide a repaired sheet. <P>SOLUTION: The sealing-up sheet comprises a porous film of a fluororesin having air permeability, and a heat fusion bondable nonwoven fabric having air permeability. The sheet is manufactured by integrating the porous film and the nonwoven fabric by passing the film and the fabric through a pair of rollers heated to a melting point or lower of the fluororesin, superposing the fabric textile along a perforation line generated when the fabric textile is sutured by a sewing machine, and closely adhering to the fabric textile by heating and impressing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is non-adhesive, has good breathability and heat resistance, and is soft and flexible when used for stitching or repairing perforations such as filter cloths and tents. The present invention relates to a close-fitting sheet and a repair sheet.

[0002]

2. Description of the Related Art Under the Air Pollution Control Law, emission standards for soot and dust in incinerators and boilers for municipal waste, industrial waste, etc. are set according to scale, and a filter cloth attached to a filter dust collector, such as a bag filter, is used to contain the exhaust gas outlet. It regulates that the dust concentration falls below the emission standard. In general, since the exhaust gas has a high gas temperature and contains a large amount of acidic substances, the filter cloth for removing dust needs to be heat and acid resistant and have high tensile strength. Needle punch felt materials such as tetrafluoroethylene fiber or aramid fiber, which have excellent heat resistance and acid resistance, are often used as a material.

In particular, the PTFE fiber felt material has good heat resistance and acid resistance and is optimal as a material for a filter cloth, but in order to use it as a large bag filter, the sewing machine is attached to a filter dust collector. Must be sewn into a bag by. With a bag filter sewn with a perforated machine, minute dust may leak from the straight perforations when filtering dust by passing a high-pressure dust-containing gas, and there is a risk that air pollution may occur. there were.

[0004]

In the bag filter of the sewing machine, it is necessary to close the perforations in order to prevent leakage of fine dust. Sealing perforations with a liquid adhesive complicates the work, is inefficient, and is often peeled off at the same time when the adhered dust layer is blown off from the filter. Further, a heat-sensitive tape may be heat-bonded along a straight perforation line, and the tape may be coated with a heat-sensitive adhesive that melts when heated to exhibit a strong adhesive force. The main component is polyamide, butyral, methacrylic-acrylic acid ester copolymer, or the like.

This type of heat-sensitive tape is easier to bond and has higher work efficiency than the case where it is sealed with a liquid adhesive, but on the other hand, the heat resistance and flexibility of the tape are not sufficient, and dust removal etc. It cannot be avoided that it will come off early. In addition, since this heat-sensitive tape has no air permeability, the bag adhesive loses its filtering ability in the bag filter, and if the tape is applied in a wide area along the perforation, the filtering performance of the bag filter will be significantly reduced. Resulting in.

The present invention has been proposed mainly for improving the problem of minute dust leakage related to bag filters of sewing machines, has good heat resistance and flexibility, and is capable of filtering adherends. It is an object of the present invention to provide a sealing sheet that does not deteriorate the performance and ventilation performance. Another object of the present invention is to apply not only to filter cloths and other linings, but also to repair damaged fabrics such as tents and waterproof coats, and to impart waterproof / moisture permeable, water repellency, breathability, stain resistance, etc. It is to provide a repair sheet.

[0007]

In order to achieve the above object, the stitch sheet according to the present invention is a non-adhesive sheet which is mainly used for stitching a cloth stitching portion such as a filter cloth or a tent. The sealing sheet is composed of a porous film of a breathable fluororesin and a heat-fusible non-woven fabric having breathability, and is integrated by passing through a roller pair heated to a temperature equal to or lower than the melting point of the fluororesin, The fabrics are overlapped along the perforations that occur when the fabrics are sewn together, and the fabrics are closely adhered to each other by heating and pressure bonding. Preferably, the porous film of a fluororesin is formed by extruding and / or rolling an unmelted tetrafluoroethylene admixture and then heating it to at least one of its melting points in the state of being stretched in at least one.

The repair sheet according to the present invention is a non-adhesive sheet used for repairing a damaged fabric portion such as a tent or a waterproof coat. This repair sheet is composed of a porous film of a fluorine-containing resin having air permeability and a heat-fusible non-woven fabric having air permeability, and is integrated by passing through a roller pair heated to a temperature equal to or lower than the melting point of the fluorine resin, It is placed on top of the tears that occur when the dough is torn, and it is adhered to the dough by heating and pressure treatment.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
As shown in (1), it has a breathable fluororesin porous film 2 and a breathable heat-fusible nonwoven fabric 3. The material of the porous film 2 is a fluororesin, and polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA),
Ethylene-tetrafluoroethylene copolymer (PETF
E), tetrafluoroethylene-hexafluoropropylene copolymer (PFEP), ethylene-chlorotrifluoroethylene copolymer (PECTFE) and the like.

The porous membrane 2 having air permeability is made of PTFE.
It is preferable that the PTFE has an apparent specific gravity of 0.3 to 0.9.
7. When the porosity is 50 to 90% and the thickness is 0.1 mm or less, it has suitable air permeability as a sealing sheet or a repair sheet, and also has good tensile strength. Examples of the commercially available porous membrane 2 include Pore Clon (trade name, manufactured by Sumitomo Electric Industries), Gore-Tex (trade name, manufactured by Gore, USA), Microtex (trade name, manufactured by Nitto Denko) and the like.

In order to produce such a porous film, for example, an unmelted tetrafluoroethylene mixture containing a liquid lubricant is extruded and / or rolled by an extruder or a roller pair to form a sheet. Mold and dry. At this time, the heating temperature may be around 100 ° C., which is lower than the melting point. Regarding the tetrafluoroethylene admixture, liquid lubricants that can be contained are naphtha, solvent, xylol,
Alcohols, ketones, esters, etc., as well as pigments, silica powder, carbon black, graphite,
Add metal powder, other resin or rubber.

The extruded and / or rolled unmelted tetrafluoroethylene admixture is then heated above its melting point in the stretched state to at least one side. This heating is, for example, while stretching the sheet by 40 to 300%,
It is performed by following the peripheral surface of the drum heated to about 350 ° C. As a result, the sheet becomes a white opaque thin film with a thickness of 0.1 mm or less, high heat resistance, flexibility and tensile strength, excellent breathability, low friction, waterproof and moisture permeable, non-adhesive work The sex is very good.

On the other hand, a thermally fusible non-woven fabric 3 having air permeability
Is composed of a thermoplastic resin that is heated and melted as a main component, and a spun fiber method or a spunbonded method that obtains a nonwoven fabric from short fibers and long fibers obtained by melt spinning these resin stock solutions, and needle locking that integrates the fibers in the web. Method, a split fiber method in which a resin film is split to form fibers, or the like may be used. The thermoplastic resin used is polyester, polyamide, polyolefin, polyester copolymer or a mixture thereof, and the like, and the heating temperature,
The grade may be appropriately selected according to the application such as the adhesive pressure and the physical properties of the adherend.

As a suitable heat-fusible non-woven fabric 3, there is a hot-melt non-woven fabric having a web-like structure with high air permeability. This nonwoven fabric is, for example, Dynac (trade name, manufactured by Toyobo) manufactured by the spunbonded method.

As is clear from FIG. 2, the fluororesin porous film 2 and the heat-fusible non-woven fabric 3 are in the form of a film or sheet, and are passed through the heating roller pair 5 to be integrated.
In FIG. 2, the film roll 6 of the porous film 2 is rotatably installed above the heating roller pair 5, and the rollers 7 and 8 are provided.
The porous film 2 is fed to the roller pair 5 via the roller 5, while the sheet roll 10 of the heat-fusible non-woven fabric 3 is rotatably installed below the heating roller pair 5, and the non-woven fabric 3 is rolled via the rollers 11 and 12. Send to pair 5. In the heating roller pair 5, the upper metal roller 14 is heated to a temperature equal to or lower than the melting point of the fluororesin, and the lower rubber roller 16 is heated from room temperature to 80 ° C. Instead of heating the rubber roller 16, the roller 14 may be heated.

The film / sheet body of the porous membrane 2 and the heat-fusible non-woven fabric 3 is preferably passed through a roller pair 5 heated to 70 to 180 ° C. at a running speed of 1 to 10 m / min and a pressure of 0.2 to 10. Press-fit at 5 kg / cm ² . The pressure-bonded film / sheet body is passed through the adjusting roller pair 18 and then cut into a predetermined width by the rotary cutter 20 to form, for example, an elongated tape body or a square piece-shaped sheet body.

The obtained stitch sheet 1 is, for example, a tape 2
2 (FIG. 3). In the filter cloth, tent, or the like, the sheet of stitching 1 is superposed along the perforations 26 generated when the fabrics 24, 24 are sewn by sewing, and is heated and pressed to raise the temperature above the melting point of the heat-fusible nonwoven fabric 3. By the treatment, the fabrics 24, 24 are closely adhered. In this heat / pressure bonding process, industrially, the doughs 24, 24 are continuously bonded by passing them through a calender roll or a pair of heat rollers. Further, in the case of a repair sheet, it may be manually attached using an iron or the like.

[0018]

EXAMPLES Next, the present invention will be explained based on examples, but the present invention is not limited to the examples.

Example 1 A porous membrane 2 of PTFE resin having a porosity of about 75% (trade name: Poaflon) for producing a sealing sheet 1.
And polyester fiber heat-meltable nonwoven fabric 3 (trade name:
DYNAC) and use. The porous film 2 and the heat-fusible non-woven fabric 3 are in the form of a film / sheet, and the heating roller pair 5 is used.
Pass through and integrate. At this time, in the roller pair 5,
The upper metal roller 14 is heated to 160 ° C., the lower rubber roller 16 is at room temperature, and the roller 14 is heated to 50 ° C. The sheet body of the porous film 2 and the heat-fusible non-woven fabric 3 is passed through the heating roller pair 5 at a running speed of 2 m / min, and the pressure is 0.3 k.
Pressure bonding at g / cm ² . Both sheets after pressure bonding are passed through the adjusting roller pair 18 and then cut into tapes by the rotary cutter 20.

The obtained tension tape 22 (FIG. 3) is laid on a perforation 26 produced when the cloths 24 are sewn together by a sewing machine in a filter cloth, a tent, or the like. The fabrics 24, 24 are closely adhered to each other by a heating / pressing process of raising the temperature above the melting point. This heating / compression bonding process may be industrially performed by passing the doughs 24, 24 through a calender roll or a pair of heat rollers to continuously bond them.

The tension tape 22 has good air permeability and does not deteriorate the filtering performance of the filter cloth even when it is adhered to a wide range of the cloths 24, 24 of the filter cloth. Further, when the tension tape 22 is used for the tension of the tent, it does not impair the original waterproofness / moisture permeability, water repellency and air permeability, and imparts antifouling property to maintain a comfortable tent internal environment.

Example 2 In order to manufacture a repair sheet (not shown), a porous membrane 2 of PTFE resin having a porosity of about 80% (trade name: POREFLON) and a heat-bondable nonwoven fabric 3 of polyamide fiber are used. (Product name: Dynac) and are used. The porous membrane 2 and the heat-fusible non-woven fabric 3 are integrated as in the first embodiment. Both sheets after the pressure bonding are passed through the adjusting roller pair 18 and then cut into square pieces by the rotary cutter 20.

The obtained repair piece in the form of a square piece is superposed on a tear that occurs when the cloth is torn in a waterproof coat such as anorak, and heating / compression bonding is performed to raise the temperature above the melting point of the heat fusible nonwoven fabric 3. The treatment adheres tightly to the dough. This heating / pressure bonding process may be performed manually by using an iron or the like.

The repair sheet has excellent flexibility and elasticity, and does not give a feeling of strangeness even when used for repairing waterproof coats such as anorak, ski wear, and rain coat. In addition, the original waterproofness / moisture permeability, water repellency, and breathability are not impaired, and stain resistance is imparted to maintain comfortable wearing comfort.

[0025]

EFFECTS OF THE INVENTION The stitch sheet according to the present invention can be easily adhered tightly to perforations such as filter cloth by passing through a roll or heating / compression treatment by hand, and minute dust leaks from linear perforations. It is possible to prevent the occurrence of air pollution and to almost completely avoid the occurrence of air pollution even by using a sewing machine filter cloth. The sealing sheet of the present invention has non-adhesiveness and good heat resistance,
Due to its low friction property, it can be used for a long time in a high temperature environment such as a filter dust collector, simultaneously preventing leakage of minute dust and using it for a long time, surely reducing the running cost of the filter cloth. To do.

Further, the eye-affining sheet of the present invention is preferable because it has good air permeability, and even if it adheres to a filter cloth over a wide range, the filtration performance of the filter cloth is hardly deteriorated. In addition, when the sheet of the present invention is used for the upholstery of a tent, the repair of a waterproof coat, etc., the original waterproof / moisture permeability, water repellency, and breathability of the tent or coat are hardly impaired, and the antifouling property is It is possible to maintain the comfortable environment and comfort of the tent by adding the.

The sheet according to the present invention can be easily bonded only by heating / pressing work such as passing through a roll or ironing, and the work is simpler and the work efficiency is better than in the past. The sheet of the present invention has excellent flexibility and elasticity, and when it is attached to a filter cloth, it does not peel off when dust is wiped off, and it feels uncomfortable even when used for repairing tent tension or waterproof coat. Never give.

[Brief description of drawings]

FIG. 1 is a schematic enlarged cross-sectional view showing a sealing sheet according to the present invention.

FIG. 2 is a schematic side view of a pressure bonding device including a roller pair used for integrating a porous film and a heat-fusible non-woven fabric.

FIG. 3 is an enlarged cross-sectional view illustrating the bonded state of the sheet of the present invention.

[Explanation of symbols]

1 upholstery sheet 2 Porous membrane 3 Heat-fusible non-woven fabric 5 heating roller pair

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hajime Funazu             950 Noda, Kumatori-cho, Sennan-gun, Osaka             Within Todenko Fine Polymer Co. F-term (reference) 4F100 AK17A AK18 AK42 BA02                       DC11A DG01 DG15B EC03                       EJ19 EJ42 GB07 JA04 JB06                       JD02A JD02B JD05 JJ03                       JK17 JL12B JL13

Claims (3)

[Claims] 1. A non-adhesive sheet used for stitching a cloth sutured portion such as a filter cloth or a tent, wherein a porous film of a fluorine-based resin having air permeability and a heat-fusible non-woven fabric having air permeability. And is integrated through a roller pair heated to a temperature lower than the melting point of the fluororesin, superposed along the perforations formed when the fabric is sewn with a sewing machine, and adhered tightly to the fabric by heating and pressure bonding. A stitch sheet for fabric stitching. 2. A non-adhesive sheet used for repairing a damaged part of a fabric such as a tent or a waterproof coat, which is a porous film of a fluororesin having air permeability and a heat-fusible non-woven fabric having air permeability. And the like, which is integrated through a pair of rollers heated to a temperature below the melting point of the fluororesin, and is overlaid on the tears that occur when the fabric is torn, and the fabric breakage that adheres tightly to the fabric by heat and pressure treatment, etc. Repair sheet. 3. A fluororesin porous film is formed by extruding and / or rolling an unmelted tetrafluoroethylene admixture, and then heating the mixture in at least one state to a temperature above the melting point of the fluororesin. The sheet according to claim 1 or 2.