JPH071085U - Sewing thread or knitting thread for oil stove wick - Google Patents

Abstract

(57) [Summary] [Purpose] In sewing thread or knitting thread for petroleum stove wick,
Mainly composed of glass long fiber yarn and para-aramid long fiber yarn, it has high heat resistance and toughness by being twisted with the primary and secondary yarns, and thread breakage at the time of sewing does not easily occur, and the sewing efficiency can be improved. , So that kerosene can be sucked up and evaporated well. [Constitution] Para-aramid filaments and glass filaments are bundled by twisting or aligning and aligning them to obtain good tensile properties. Moreover, the mechanical brittleness due to poor bending resistance of the glass filaments reduces para-aramid filaments. As a result of the long fiber yarns compensating and the glass long fiber yarns compensating for the insufficient heat resistance of the para-aramid long fibers, defective yarn breakage is less likely to occur in the sewing or knitting process. Also,
Even if the tip of the wick is fired to prevent tar from adhering to it, the glass fiber conducts and diffuses the heat received by the para-aramid fiber, so that heat damage is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sewing thread or a knitting thread for an oil stove wick, which has excellent heat resistance and toughness.

[0002]

[Prior art]

 Conventionally, as the heat-resistant sewing thread or knitting thread of this type, there are glass fiber thread (inorganic) and polyamide (organic) aramid fiber thread. Each will be described below. (1) Sewing thread made of glass fiber thread The softening point is 840 ° C, which is better than any organic fiber thread in heat resistance, but has a drawback that the bending resistance is extremely weak. For this reason, when used as a sewing thread, the thread is easily broken even by a slight impact, so that the number of revolutions of the sewing machine cannot be increased too much, and therefore the sewing efficiency cannot be increased. Also, when glass fiber thread is used for sewing wicks such as petroleum stoves and oil stoves, sewing machine needles can be used when further overlapping stitches are sewn on the sewing thread such as presser foot sewing and repair of broken thread. The front suture may be cut due to the impact of the piercing. Further, the sewing thread is easily broken due to friction or hooking during the process. Especially when the wick is used for practical purposes with the thread cut, it is likely to cause abnormal combustion.

(2) Sewing Thread Composed of Aramid Fiber Yarn Although the meta-aramid fiber yarn has better flex resistance than glass fiber, it has a thermal decomposition temperature of 370 ° C. and is more heat resistant than other organic fibers. Although it can be said that it is good, it has insufficient heat resistance to be used as a sewing thread for the heat-resistant combustion part of a wick of an oil stove, a cooking stove, or the like. Especially when it is used for the first thread at the tip of the core, the sewing thread will be burned out due to the heat during dry firing. On the other hand, the para-aramid fiber yarn has good bending resistance and also has a tensile strength of 22 to 25 g / de (glass fiber yarn 4.0 to 5.5 g / de, meta-aramid fiber 5 to 6 g / de). de) and remarkably high. Due to this excellent strength characteristic, high-speed operation of the sewing machine is possible, and since it is sufficient to use a thin sewing thread, unnecessary swelling of the sewing thread can be eliminated, and the bobbin thread winding Although it has a favorable effect as a sewing thread, such as the length can be increased and the number of times of bobbin thread replacement can be reduced, the heat resistance is lower than that of the meta-aramid fiber, and the sewing thread of the heat-resistant combustion part of the wick, especially No. 1 Not enough for use in yarn. The aramid fiber yarn is described, for example, in the Journal of Textile Machinery, 1987, Vol. 40, No. 4, P. 159-P. 173 “Application of high-performance fibers to high-tech industrial applications” and the like. Further, there is a sewing thread in which a glass fiber and a chemical fiber are twisted together to improve heat resistance, and the surface of the thread is provided with a silicone cover (for example, Japanese Utility Model Laid-Open No. 62-88774).

[0004]

[Problems to be solved by the device]

 However, when such a sewing thread is used for the wick of an oil stove, the silicone film dissolves in the kerosene that sucks up the wick, and since silicone is a high-boiling compound, it cannot be evaporated and accumulates in the wick. The formation of slag, which hinders the uptake and evaporation of kerosene, and also significantly slows down the burning speed when the oil stove is ignited, causing odors. The present invention has been made in order to solve the above-mentioned problems, and high heat resistance and toughness are obtained by mainly twisting a glass long fiber yarn and a para-aramid long fiber yarn into a primary and a secondary. In addition, the thread does not easily break when sewing, and it is possible to improve sewing efficiency. In addition, when used in the wick of an oil stove, it can wick and evaporate kerosene satisfactorily for the oil stove wick. Or, it is intended to provide a knitting yarn.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a sewing thread or a knitting thread for a petroleum stove wick of the present invention is a primary twisted yarn obtained by subjecting a glass filament fiber and a para-aramid filament fiber yarn to under-twisting. This is a secondary plied yarn obtained by aligning and twisting a plurality of yarns.

[0006]

According to the above structure, the para-aramid continuous fiber has a tensile strength of 22 to 25 g / de, which is 4 times or more of about 5 g / de of the glass fiber, and a breaking elongation of the glass fiber. Since they are almost the same at around 4%, the balance in tensile properties is good when both are twisted or aligned and bundled. In addition, the mechanical brittleness due to poor bending resistance peculiar to long glass fiber is compensated by the para-aramid long fiber yarn, and the lack of heat resistance of the para-aramid long fiber is complemented by the long glass fiber yarn. As a result, the sewing thread or the knitting thread becomes tough and the thread breakage is less likely to occur in the steps such as sewing or knitting. Even if the tip of the wick is fired to prevent tar from adhering, the glass fiber conducts and diffuses the heat received by the para-aramid fiber, which prevents heat damage and prevents the excess of silicone or the like. As there is no significant deposit, kerosene can be sucked up and evaporated well.

[0007]

【Example】

 The heat resistant sewing thread according to the first embodiment of the present invention shown in FIG. 1 will be described below. The sewing thread of this embodiment is an example of a plied yarn 1, and the plied yarn 1 is formed by plying a plurality of para-type aramid fiber yarns 2 and glass fiber yarns 3. Here, each glass fiber yarn 3 which is one main element is made of a yarn in which a large number of single fibers are bundled, and the single fibers preferably have a fineness of 5 μ or less, and a yarn count of 5 to 70. Tex is preferred. Further, since it is difficult to spin a thin and strong spun yarn from the glass fiber yarn 3, a long fiber yarn may be used.

Each para type aramid fiber 2 which is the other main element of the plied yarn is also composed of a yarn in which a large number of monofilaments are bundled, and the monofilaments have amide bonds connecting aromatic rings in para positions to each other. A fiber formed of an aramid polymer having a certain structure, for example, polyparaphenylene terephthalamide (trade name: Kevlar, manufactured by DuPont)

[0009]

[Chemical 1]

Alternatively, polyparaphenylene / 3,4 ′ diphenyl ether / terephthalamide (trade name: Technora, Teijin Ltd.)

[Chemical 2]

The para-aramid fiber yarn preferably has a count of 50 to 400 de. Further, since this para-type aramid fiber yarn is easy to spun thin and strong spun yarn, either spun yarn or long fiber yarn may be used. In addition, the twisting of the glass fiber yarn 3 and the para-aramid fiber yarn 2 is performed by first aligning each one to form two twists (bottom twist), and then aligning a predetermined number of these and performing top twist. There is also a method in which the required number of each is aligned and twisted at once. Further, the plied yarn is mainly composed of glass fiber yarn and para-type aramid fiber yarn, but it may be plied yarn such as cotton yarn, rayon staple yarn, carbon fiber yarn and the like as other components. When the para-aramid fiber is a spun yarn, the fiber of the other component as described above can be mixed with the para-aramid fiber in the spinning step.

Here, the ratio of the fiber yarn of the other component to be twisted and twisted with the glass fiber yarn and the para-aramid fiber yarn is such that the heat resistance and high tenacity of the glass fiber yarn and the para-aramid fiber yarn are substantially impaired. It is required to be within a range that does not exist, and 50% or less, preferably 30% or less is good. Further, when the glass fiber yarn and the para-aramid fiber yarn that compose the plied yarn are both long fiber yarns, the surface of the plied yarn is smooth, so that when used for sewing, the thread frays at the cut end. Although it tends to occur, when the fibers of other components as described above are spun together and twisted, the surface of the spun yarn is fluffed to lose smoothness, and it is possible to prevent fraying at the cut end.

Next, a heat resistant sewing thread according to a second embodiment of the present invention shown in FIGS. 2 and 3 will be described. The heat-resistant sewing thread of the present embodiment is an example of the aligning thread 5, which is mainly composed of the para-aramid fiber thread 2 and the glass fiber thread 3, and these are aligned with the rayon-swoof thread 4 to form an adhesive agent. 6 is added and the yarn is bundled by the adhesive force. In the case of this embodiment, twisting may not be applied, but a small amount may be applied. There is an advantage that the production efficiency is better than the plied yarn of the first embodiment. The adhesive 6 can be applied to the gathering yarn 5 by a dipping method, a roller method or the like.

The adhesive 6 does not necessarily require heat resistance. The reason for this is that the sewing thread does not have to have heat resistance at the sewing stage, and heat resistance as a sewing thread is required at the stage of being used for the purpose of use after sewing, but the adhesive is deteriorated by heat or burned out. However, there is no particular problem. As the adhesive 6, a polyacrylic acid ester-based adhesive, a polyvinyl acetate-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, a silicone-based adhesive, or the like is used, but the adhesive is not limited thereto.

In both the first and second embodiments, the yarn 1 in which the para-aramid fiber yarn 2 and the glass fiber yarn 3 are twisted together, or the yarn 5 that is aligned and adhered is The mutual complementing action of each property of the material makes it excellent in its tensile property, bending resistance and heat resistance. Therefore, it is possible to prevent thread breakage when used as a sewing thread, and eventually sewing with a sewing machine. The speed can be increased and the production efficiency of sewing can be improved. Among the aramid fibers, the meta type has a low tensile strength of 5 to 6 g / de and a high breaking elongation of 35 to 40%, and therefore has a small effect of complementing with the glass fibers.

Hereinafter, four specific examples of the lock stitch thread will be described. (1) A glass filament fiber of 11 tex having a fineness of a single fiber of 5μ and a polyparaphenylene 3,4'diphenyl ether terephthalamide filament fiber of 100 de are aligned and twisted one by one. It was twisted and made into a sewing thread. (2) Align 11 tex long glass fiber yarn having a fineness of 5 μm of single fiber, 100 de polyparaphenylene terephthalamide long fiber yarn, and 30 th rayon-spun spun yarn, and align each one Twist was applied, three of these were aligned and the upper twist was applied and twisted together to obtain a sewing thread. (3) Two pieces of 34 tex long glass fiber yarn having a fineness of 3μ of monofilament and 200 para polyparaphenylene terephthalamide long fiber yarn are aligned and twisted together to form a sewing thread. did. (4) 34 tex long glass fiber yarn having a single fiber fineness of 3 μ and 200 de polyparaphenylene terephthalamide long fiber are aligned and combined one by one, and a silicone adhesive is applied to this. A thread was applied with the agent, dried, and bonded to obtain a suture thread.

[0017]

[Effect of device]

 As described above, the heat-resistant sewing thread of the present invention has both heat resistance and toughness, and the following effects can be obtained. (1) Since sewing thread breakage does not easily occur during sewing, the number of revolutions of the sewing machine can be increased and the sewing efficiency can be improved. Further, even if friction or catching occurs during the sewing process, the sewing thread is hard to break, which makes it easy to handle the sewn product. By the way, since 100% glass fiber yarn has weak bending resistance and is easily cut, utmost care must be taken when handling sewn products. (2) When the sewn product using the lock stitch thread is used for applications requiring heat resistance, the glass fiber thread maintains the sewing strength even if the para-aramid fiber thread is deteriorated or burned. , Can exhibit a high degree of heat resistance.

(3) In particular, when a lock sewing thread is used for the wick of a burning appliance such as an oil stove or an oil stove, the advantages are extremely large as follows. That is, the conventional 100% glass fiber yarn has a normal tensile strength of 4 to 5.5 g / de, but due to the mechanical brittleness peculiar to the glass fiber, the core strength in the core making process after sewing or knitting is high. There is a problem that thread breakage occurs relatively easily due to friction during movement, catching, and piercing with a sewing machine needle during overlap sewing. On the other hand, the sewing thread of the present invention uses the para-aramid fiber having a tensile strength of about 22 to 25 g / de and a remarkably excellent bending resistance, so that the thread breakage described above is substantially nonexistent. Becomes

Further, in the core making process, scissors are used for removing residual threads of sewing threads and removing weft threads that are fraying from the tip of the heat-resistant cloth. Although the weft thread was often cut to cause thread breakage accidents, when the sewing thread of the present invention is used, the strength of the para-aramid fiber makes it difficult to cut even with scissors, and such thread breakage also occurs. Disappear. Further, since the yarn breakage accident in the core making process is eliminated, the labor and time required for the yarn breakage check can be shortened. In addition, there is no risk of missing a thread break in the inspection, the number of defective products related to the thread break is greatly reduced, and it is possible to contribute to the improvement of the reliability of the combustion appliance itself.

Further, even if the tip portion of the heat-resistant member of the core for the burning appliance is fired through a furnace at high temperature (around 650 ° C.) in order to prevent tar from adhering, the tensile strength and And flex resistance are slightly reduced, and heat shrinkage hardly occurs. This is a great effect that cannot be obtained when 100% glass fiber yarn is used. It is known that para-type aramid fiber undergoes rapid thermal decomposition and heat shrinkage at 400 to 500 ° C. Here, in the type of para-type aramid fiber yarn and glass fiber yarn, para-type aramid fiber is used. The reason why fiber yarns can withstand high temperature tip firing is that the firing time is relatively short, and the heat conducts through the glass fiber yarns with good thermal conductivity and diffuses. It is thought that this is because it can be suppressed.

Further, as a material for the heat-resistant combustion part of a petroleum stove, a petroleum hob, etc., a heat-resistant yarn made of glass fiber, flame-resistant fiber, rayon / suf etc. is used as a warp yarn (it becomes a warp yarn when it becomes a core) The lock stitch can be knitted as a weft. By knitting the lock stitch with the weft as the weft, the number of rotations of the knitting machine can be increased as compared with the conventional one in which 100% glass fiber is used as the weft, so that the production efficiency can be increased. In addition, it is possible to prevent the yarn breakage of the knitting yarn in the subsequent steps.

(4) In particular, the glass long fiber yarn and the para-aramid long fiber yarn are first twisted to form a primary twisted yarn, and a plurality of the primary double twisted yarns are aligned to obtain the second twisted yarn. Since the twisted yarn is used, the glass long fiber yarn and the para-aramid long fiber yarn are uniformly mixed, and the weak flex resistance of the glass fiber is compensated by the para-aramid fiber yarn. The glass fiber and para-aramid fiber are long-fiber yarns, and the surface of the sewing thread is smooth, and the yarn being sewn is smooth. Since fluffing and cutting due to being caught on the road, etc. are eliminated, a thin and high-strength sewing thread can be obtained, the bobbin thread of the sewing machine can be lengthened, and the number of bobbin thread replacements can be reduced, and the wick Connecting the heat-resistant part and the suction part of When used to sew parts, unnecessary and harmful swelling of the sewing thread can be eliminated. When used as the first thread of the heat-resistant part of the wick, the glass fiber bundling material that constitutes the heat-resistant part is burned off. Since the glass fiber has a function of conducting and diffusing the heat received by the para-aramid fiber even at the time of firing the tip, heat damage of the para-aramid fiber can be prevented.

Further, since there is no extra deposit such as silicone, these are dissolved in kerosene and accumulated on the tip of the wick to form tar, which hinders the absorption of kerosene or causes a problem when igniting. Slow down the fire and eliminate the generation of odors.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat resistant sewing thread according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a heat resistant sewing thread according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a heat resistant sewing thread according to the second embodiment.

[Explanation of symbols]

 1 ply-twisted yarn 2 para-aramid fiber yarn 3 glass fiber yarn 4 rayon-suf yarn 5 aligned yarn 6 adhesive

Claims (1)

[Scope of utility model registration request] 1. A primary twisted yarn is obtained by twisting a glass long fiber yarn and a para-type aramid long yarn yarn into a primary twisted yarn, and a plurality of these primary twisted yarns are aligned and top twisted into a secondary twisted yarn. A sewing thread or a knitting thread for an oil stove wick, characterized in that