JPH0241495B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a package in which polyester-based synthetic fiber false-twisted yarn is wound into a cheese shape, and particularly to a tapered end-wound package that can be unwound at high speed with false-twisted yarn of 75 de or less. <Prior art and its problems> Conventionally, the package of false-twisted yarn made of thermoplastic synthetic resin has been developed using
Many winding methods and devices have been proposed, including Japanese Patent Publication No. 45-7023 and Japanese Patent Publication No. 52-27259. However, all of these conventional techniques have the following drawbacks. That is, in recent years, as high-speed WJL has become popular, it is required that the weft yarn be stably unwound at an unwinding speed of 600 m/min or more. However, in a package wound under conventional selvedge breaking conditions and twill breaking conditions, even if the package shape is good in appearance, high-speed unwinding occurs frequently and the yarn cannot withstand daily production. It wasn't something I could do. Furthermore, even with fine deformed yarns, for example, 75 de or less, the hardness of the processed yarn package has been increased and the selvedge breaking conditions have been optimized to the maximum, there is a problem that yarn breakage occurs frequently when unraveling is carried out at high speed. <Purpose of the Invention> In order to solve this problem, the present inventor unraveled a package of false twisted yarn at high speed and carefully investigated the cause of yarn breakage, and found that the unraveled upper layer yarn and lower layer yarn were entangled and intertwined. We discovered that high-speed unwinding is possible with a package that does not cause tangles between the upper and lower yarns, as most of the yarns break.
This led to the present invention. That is, an object of the present invention is to eliminate the above-mentioned drawbacks and provide a package of polyester-based synthetic fiber false-twisted yarn that can be unraveled at high speed and used for high-speed WJL weft yarns. <Structure of the Invention> The object of the present invention is achieved by the following structure. That is, the present invention provides a package in which false-twisted polyester synthetic fiber yarn is wound into a cheese shape, in which the winding hardness at the ears and the center of the package is substantially equal (within 5 degrees) and 75 degrees or more, The false-twisted yarn constituting the package forms at least 5 entangled parts/m, and the package winding angles in the inner and outer layers are substantially equal and are 13° or less. This is a package made of twisted yarn. The present invention will be explained in detail below. In the present invention, in order to prevent the upper and lower layer yarns from tangling, it is necessary to increase the winding hardness so that there is virtually no difference in hardness in the axial direction of the package (within 5 degrees), and to ensure that the yarn is sufficiently wound around the package. It is. For this purpose, it is necessary that the winding hardness be at least 75°, and if it is less than this, it will be difficult to sufficiently prevent the occurrence of tangles. Conventionally, the winding hardness has been increased by simply reducing the winding overfeed rate or increasing the traverse rotation speed, but the winding hardness at the ears of the package wound in this way is Even if it is large, the winding hardness at the center becomes small and uniform winding hardness cannot be obtained. For this reason, when the processed yarn was unwound, the lower layer of the processed yarn was lifted up in areas where the winding hardness was low, causing yarn breakage due to entanglement with the upper layer of the processed yarn. In order to make the winding hardness uniform in each part of the package, it is necessary to increase the number of winds, and the number of winds in both the inner and outer layers of the package should be 3 or more (the traverse rotation speed is small to reduce the winding overfeed). This allows the winding hardness at the package ears and center to be substantially equal (within a 5° difference) of 75° or more, preferably in the range of 75 to 85°.
In addition, in order to prevent the processed yarn from tangling, each multifilament must be bundled, and the processed yarn must have at least 5 entangled parts/m. Furthermore, in order to suppress tension fluctuations during unwinding and prevent unraveling and breakage, it is preferable to wind the inner and outer layers with equal winding tension (the average value at each part is within 5 g). It is sufficient to adopt a winding mechanism that controls the winding overfeed so that it becomes smaller as the traverse stroke length becomes shorter in tapered end winding. The taper angle of the package formed in this way is usually preferably 70 to 85 degrees, and the oil application amount (OPU) is preferably 0.5% or less. Furthermore, in the present invention, the yarn winding winding angles of the package in the inner and outer layers are substantially equal and
It is necessary that the angle is 13° or less. If the helix angle is 13 degrees or more, the number of winds becomes small and the lower layer yarn becomes entangled, causing tangles between the upper layer yarn and the lower layer yarn, which tends to cause unraveled and broken yarns. Furthermore, if the helix angle changes between the inner and outer layers, in extreme cases, the product winding shape may become stepped, or the winding tension may change, resulting in bulges and poor unwinding properties. The winding hardness is the value indicated by the pointer when the measuring part of a rubber hardness meter specified in Japanese Industrial Standards (JISK6301) is pressed against the side of the package cage. Refers to the vicinity of the tapered part. Polyester-based polymers are polymers having ester bonds in their molecular chains, and include polymers typified by polyethylene terephthalate, copolymers, and blend polymers. Example Polyethylene terephthalate with an intrinsic viscosity of 0.64 was spun at a speed of 3000 m/min and a melting temperature of 290°C.
POY, SD115 denier/36 filament was processed at a speed of 700 m/min using Scrag's SDS-8DTY machine.
DTY processing was performed at a first heater temperature of 230°C and a draw ratio of 1.60 to obtain a false twisted yarn package with a taper angle of 75°. Next, unwind the various packages obtained at a distance of 15
cm, and the unwinding test was conducted at an unwinding speed of 1000 m/min. The results and various conditions of the package used are
Shown in the table.

[Table] Similar results were obtained.
As can be seen from the examples in Table 1, the present invention
It is extremely effective for high-speed WJL weft yarns, as almost no yarn breakage occurs even at high-speed unwinding of m/min or higher.

Claims (1)

[Scope of Claims] 1. A package in which a false twisted yarn of polyester synthetic fiber is wound into a cheese shape, in which the winding hardness at the ears and the center of the package is substantially equal (within 5°) and 75° or more. The false-twisted yarn constituting the package forms at least 5 entangled parts/m, and is further characterized in that the package winding angle in the inner and outer layers is substantially equal and is 13° or less. Packaging made of false twisted yarn. 2. A package of false-twisted yarn according to claim 1, wherein the false-twisted yarn has a diameter of 75 de or less. 3. A package of false twisted yarn according to claim 1 or 2, wherein the package is formed with a tapered end. 4. The false twisted yarn package according to claim 3, wherein the taper angle is 70 to 85 degrees. 5 Oil application amount (OPU) of false twisted yarn is 0.5%
A package of false twisted yarn according to claim 2 or 3 below.