JP3730621B2 - Manufacturing method of kenaf intertwisted yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to, for example, roofs of various stadiums such as dome-shaped baseball stadiums, roofs of small tents used for athletic events, and tent fabrics used for roofs and walls of auxiliary facilities and exhibition halls. The present invention relates to a method for producing an optimal kenaf twisted yarn .
Background Art Conventionally, for example, tent fabrics used for assembly tents used in athletic events and roofing materials for large membrane structures in expositions, soft chlorinated fabrics made of various synthetic fiber yarns are given soft waterproof properties. Those coated with a vinyl resin or the like are generally used. In addition, a tent fabric in which a halogen compound or the like is contained in a coating resin is also used in order to impart flameproofness.
However, tent fabrics made of such synthetic fiber yarns tend to be disposed of by incineration after use because they deteriorate to the extent that they are difficult to use and regenerate. However, incineration may generate various chemical substances such as dioxins and harmful gases. Therefore, conventionally, tent fabrics are often disposed of as landfills as industrial waste.
In view of the above points, the present invention is a tent fabric that can be easily reused after use, contributes to resource saving and environmental protection, and is capable of forming a high-density and high-strength fabric. It is an object of the present invention to provide a method for producing an optimal kenaf-twisted yarn .
Disclosure of the invention
It characterized as the production method of Ke naphthoquinone交撚yarn, a yarn made of kenaf fibers, the manufacturing method of kenaf交撚yarn to produce a twisted yarn by twisting the yarn made of chemical fibers or natural fibers such as, from the chemical fiber, etc. while a yarn made giving a constant tension in the feeding with slow not feed speed of the yarn made of the kenaf fibers.
Further, in the method for producing a kenaf laid twisted yarn in which a yarn made of kenaf fiber and a yarn made of chemical fiber or natural fiber are twisted together to produce a twisted yarn, a tensile force enough to cut both yarns is applied to the kenaf laid twisted yarn. The purpose of this is to control the respective feed speeds based on the elongation at the limit at which both yarns are cut so that the respective yarns stretch and break at substantially the same time when acted .
As described above, when the present invention is applied to a tent cloth, kenaf fibers are used as the fiber yarns constituting the tent cloth, so that it can be easily recycled on paper after the tent cloth is used.
Therefore, unlike conventional tent fabrics, there is no need to dispose of them, and they can be reused after use to save resources, indirectly suppress global warming, and contribute to environmental protection. .
In addition, the kenaf intertwisted yarn of the present invention stabilizes the thickness and strength of the yarn, improves the tensile strength, and improves the sliding of the yarn, enabling high-density and high-strength woven fabrics, especially suitable for tent fabrics It is.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
The tent fabric of the present invention is composed of a woven fabric made of fiber yarns containing kenaf fibers.
The kenaf fiber refers to a fiber obtained from kenaf (Mariaceae), and various kinds of fiber can be used regardless of the origin.
The fiber yarn made of kenaf fiber may be spun yarn (100% by weight of kenaf fiber) from kenaf fiber alone, or may be a mixed yarn with fibers other than kenaf.
As fibers other than kenaf, other natural fibers such as jute and cotton, chemical fibers such as rayon, synthetic fibers such as polyester (PET), and the like can be used.
The mixing ratio of the kenaf fiber and the other fibers in the case of using the blended yarn is not particularly limited, but the kenaf fiber is preferably 10% by weight or more, preferably 50% by weight or more.
The fiber yarn containing the kenaf is obtained by immersing the raw material kenaf in water, separating the bast, drying it to obtain a bast fiber, and cutting it into an appropriate length (about 50 mm) according to a known usage. This can be obtained by spinning on a spinning machine. When blended yarn is used, spinning is performed with a spinning machine while mixing other fibers.
The obtained fiber yarn is formed into a woven fabric according to a known usage. The weaving method is not particularly limited, and may be a normal plain weave or twill weave.
Further, the woven fabric is woven only with fiber yarns made only of kenaf fibers, woven with only mixed yarns of kenaf fibers and other fibers, or fiber yarns made only of the kenaf fibers and the mixed yarns. Examples of various forms such as those woven with yarns, fiber yarns composed only of the kenaf fibers and / or woven with the blended yarns and other fiber yarns not containing kenaf fibers, are exemplified.
If necessary, at least one surface of the woven fabric may be subjected to weathering treatment such as waterproofing and lightproofing, fireproofing and flameproofing. The treatment material at this time is selected from polyolefins and the like that do not adversely affect the environment when it is recycled as paper.
A woven fabric containing such kenaf fibers is cut into an appropriate shape and used as a tent fabric, for example. Kenaf grows fast and has excellent carbon dioxide fixing ability, so using tent fabrics using such kenaf fibers can indirectly suppress global warming and contribute to environmental purification. .
The tent fabric according to the present invention can be recovered and recycled to paper after it has been used for a long period of time and deteriorated or partially broken and cannot be used.
In the recycling process to paper, according to conventional usage, the waste tent dough is cut into an appropriate size, put into a mixer, stirred with water, charged with chemicals, heated and passed through a screen to remove coarse dust. Thereafter, the paper is passed again through a screen and dehydrated with a thickener to obtain waste paper pulp. This is mixed with new pulp as needed, and then recycled using a paper machine to produce recycled paper.
Next, a description will be given of an intertwisted yarn of a spun yarn or mixed yarn (kenaf yarn) or the like made of only the kenaf fibers and a polyester yarn as a yarn (presser yarn) made of chemical fibers. As shown in FIG. 1, a kenaf yarn 1 and a polyester yarn double yarn (PET double yarn) 2 are twisted together, but the PET double yarn 2 feed speed (V2) is higher than the kenaf yarn 1 feed speed (V1). Set slightly slower. Specifically, the relationship 1 <(V1 / V2) <1.1 is satisfied. Further, preferably, 1 <(V1 / V2) <1.05. Further, the kenaf yarn 1 and the PET double yarn 2 are respectively sent out at a constant speed and with a constant tension, and the twisted state is a sweet twisted yarn. The number of twists is preferably about 100 times / m, for example.
Kenaf yarn is thicker than other natural fibers, so the yarn has irregularities (shown in phantom lines in FIG. 1), the thickness and strength are not stable, and 100% kenaf ensures strength. Can not. However, when the twisted yarn 3 is manufactured by the above-described method, the PET twin yarn 2 sent out slightly longer is wound around the kenaf yarn 1 with a constant tension. Therefore, the thick portion 1a of the kenaf yarn 1 is made of PET. The thin portion 1b is tightly tightened by the twin yarn 2 to suppress fluff, and the thin portion 1b hardly changes because the tightening force of the PET twin yarn 2 is small. Here, the strength is stable and strong at a substantially constant thickness. A simple twisted yarn 3 can be produced.
For example, when this woven yarn 3 is used as a woven fabric as a weft, since the yarn is slippery and fuzz is suppressed, a high-strength and high-density woven fabric is possible, which is optimal for the tent fabric. It is. In addition, it is preferable to use a polyester type warp that has almost no surface irregularities, but is not particularly limited.
Further, the kenaf intertwisted yarn 3 is not limited to the above embodiment, and may be as follows. Specifically, the kenaf yarn 1 and the PET double yarn 2 are used in the same manner as described above. However, by controlling the feeding speed based on the elongation rate of both yarns, the tensile force can be further increased. On the other hand, it was a strong twisted yarn.
For example, a kenaf yarn kenaf uses a 7th single yarn with a jute count, and a PET yarn uses a 20th twin yarn with a cotton count. Then, the elongation at the limit of cutting per unit length of both yarns is measured. For example, it is assumed that the elongation rate of kenaf yarn is 5% and the elongation rate of PET twin yarn is 15%. Subtract a small value from a value with a large elongation to find the difference between the two values (15-5 = 10%). In the present embodiment, the PET double yarn 2 is elongated by 10% per unit length as compared with the kenaf yarn 1.
Accordingly, the kenaf yarn 1 having a low elongation rate is sent out at a constant speed and twisted faster by a numerical difference (10% per unit length) than the PET double yarn 2 having a high elongation rate. While twisting, twist. As a result, when tension is applied to the kenaf twisted yarn 3, both yarns are cut almost simultaneously, so that a stronger twisted yarn can be manufactured. In addition, since the kenaf yarn 1 is twisted with the PET twin yarn 2, the unevenness of the kenaf yarn can be reduced and fluff can be suppressed.
The present invention is not limited to the above-described embodiment, and as the presser yarn, in addition to the PET twin yarn 2, one made of three or more polyester yarns or one made of natural fibers can be employed.
In addition, since the textile fabric using each said twisted yarn can obtain a high intensity | strength and a high density, it is optimal as a tent fabric, but it cannot be overemphasized that it can be used also as another fabric.
Embodiment FIG. 2 shows an embodiment as a tent fabric. The tent fabric 10 shown in the figure has a coating layer 12 on both sides of the woven fabric (base fabric) 11.
The base fabric 11 was a 2 × 2 twill weave using polyester yarn 13 as warp and the kenaf intertwisted yarn 3 as weft. In addition, the weight ratio of the polyester yarn and the kenaf twisted yarn 3 is 23:73.
The base cloth 11 was coated on both sides with EVA (ethylene / vinyl acetate copolymer). The weight was 403 (g / m 2) for the base fabric, 400 (g / m 2) for EVA, and 804 (g / m 2) for the tent fabric 10.
In order to take out the pulp from the tent dough 10 and recycle it, the following experiment was conducted. Specifically, an alkali cooking method is adopted. A small piece (500 g) of the tent dough, water (1 liter) and sodium hydroxide (350 g) were charged into a known rotating autoclave.
And the cooking test was done over 4 hours, maintaining the inside of an autoclave at 170-180 degreeC and a pressure at 7-8 kgf / cm <2>. As a result, it was confirmed that EVA and the polyester fiber were dissolved and only the kenaf fiber remained, so that the pulp could be taken out.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a kenaf twisted yarn showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a tent fabric showing an embodiment of the present invention.

Claims (2)

In the method for producing a kenaf cross-twisted yarn in which a yarn (1) made of kenaf fiber and a yarn (2) made of chemical fiber or natural fiber are twisted to produce a twisted yarn (3), method for producing kenaf交撚yarn, characterized in that feeding the 2) at a constant composed of the kenaf fiber while applying tension thread (1) slow than the feed rate. In the method for producing a kenaf cross-twisted yarn in which a yarn (1) made of kenaf fiber and a yarn (2) made of chemical fiber or natural fiber are twisted to produce a twisted yarn (3), both yarns (1), ( 2) The elongation at the limit at which both yarns (1) and (2) are cut so that when the tensile force enough to cut 2) acts on the kenaf twisted yarn, each yarn stretches and breaks almost simultaneously. A method for producing a kenaf intertwisted yarn, characterized in that each feed rate is controlled based on

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