Production process of skin-core type polyester monofilament by separating mother yarn

Abstract

The invention discloses a production process of a skin-core polyester monofilament by separating a mother yarn. The production process comprises the following steps: drying, carrying out melt spinning, preparing the mother yarn, and preparing a monofilament; the drying step comprises the steps that conventional polyester chips are pre-crystallized and dried to obtain dry polyester chips A, the pre-crystallization temperature of the conventional polyester chips is 160-170 DEG C, the drying temperature of the conventional polyester chips is 150-170 DEG C, the drying time of the conventional polyester chips is 6-8 hours, and the moisture content of the dry polyester chips A is smaller than or equal to 0.003%; the low-melting-point polyester chips are subjected to one of rotary drum drying or continuous drying to obtain low-melting-point polyester dry chips B, the melting point of the low-melting-point polyester chips B is 110-230 DEG C, the drying temperature is 60-130 DEG C, the drying time is 8-30 hours, the rotary drum drying vacuum degree is smaller than or equal to -0.093 Mpa, and the water content of the low-melting-point polyester chips B is smaller than or equal to 0.0045%; the preparation process of the skin-core type polyester monofilament is high in production yield and uniform in evenness, and a user uses the skin-core fibers which do not need to be twisted.

Description

technical field [0001] The invention relates to the technical field of polyester fibers, in particular to a production process for sheath-core polyester monofilaments divided by mother filaments. Background technique [0002] At present, the 20D, 25D, and 30D skin-core thermal fuses used in Roman shades and filters on the market are all spun into multifilaments, twisted, and then woven. This method has high production costs and low output. , the latter user needs to go through twisting before using it. [0003] The existing technology produces multi-F yarns (single yarn fineness 2D-6D), which is easy to produce fuzz during the production process, and the fuzz will cause the product to be easily broken during the unwinding, twisting and drawing process, which not only reduces the twisting The full volume rate of silk reduces the production efficiency. [0004] Chinese patent, patent number: CN102560708B discloses a production process of hot-melt polyester monofilament with ...

AI Technical Summary

Problems solved by technology

Among them, the polyester monofilament is made of sheath-core composite filaments bonded to each other; the cortex of the sheath-core composite spinning is low-melting point polyester, and the core layer is ordinary polyester, wherein the weight percentage of low-melting point polyester is 30%- 50%, the weight percentage of ordinary polyester is 70%-50%; the linear density range of sheath-core composite yarn is 33dtex-167dtex, and the linear density range of finished hot-melt new polyester monofilament is 35dtex-180dtex, with an island-shaped cross section, but the The patent adopts the method of spinning multifilaments first, twisting them into single strands, and then weaving them into curtains or filter screens. This method is technically difficult and the output is low. When customers use it again, they need to be twisted before it can be used, which increases the number of customers. In addition, there is a monofilament production line in the market that is cooled by water and then wound into monofilament. This method has low output, and the products produced are uneven and cannot meet the quality requirements of customers. Therefore, There is an urgent need for a sheath-core fiber with high production output, uniform dryness, and no need for twisting for users

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