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The polypropylene bulk yarn is a fiber mixed by two different shrinkage ratings into a yarn, and then the yarn is placed in steam or hot air or boiling water. At this time, the fibers having high shrinkage generate a large contraction, located in the yarn The center, and the low shrinkage of low shrinkage is mixed, and is extruded on the surface of the yarn to form a circle shape, thereby obtaining fluffy, plump, elastic expandable yarn.
The gray fabric of the polypropylene expanded yarn is generally stained, decreasing (single-sided or double-sided), etc., which requires a soft, fluffy, elasticity and dyeing, and elasticity. Therefore, the expander of the expandable yarn, the specifications, mixing uniformity of the feedstock, etc. are its main performance indicators.
The expansion is the degree of expansion after the raw yarn passes, which is the main factor determining the fluffy, softness and elasticity of the cloth, and generally requires the amount of expand of the yarn to over 22%. In actual production, the size of the yarn is generally used as the measurement index of the test expand, generally between 18% to 19.5%. About the measurement of the reduction rate should pay attention to the following questions:
(1) The raw yarn measurement should be pre-add 20g tension; (2) Steaming the measured raw material in steam; (3) The retracted expandable yarn also adds 20 g of tension and then measure the length.
The expanderity is too large to cause the gray fabric, fluffing softness, no elasticity; the expandable scale is too small to cause sequins, plush sensing, and the like.
The mixing uniformity of the raw material is an important reason for the effects of the dyeing effect. The mixing is uniform will result in unevenness of the matching and affecting expandable performance.
The process of polypropylene bulk yarn s is a bit complex, and the production cost is also higher than other finished silk, and it is desirable in the near future to increase significantly, and the road is opened for the polypropylene expansion yarn.
Advantages of polypropylene bulk yarn : fresh color, not easy to fade, antistatic effect, good rebound, blanket
Ping, full, suitable for producing a woven carpet, and the surface is like a wool carpet.
The polypropylene bulk yarn is called polypropylene BCF yarn, rich in variety, good expandment, uniform network, complete color variety, can be customized according to customer requirements. The company's polypropylene bulk yarn can be used in both carpet, automotive pad, and can also be widely used in various decorative fabrics, weaving, fabric, door and windows, etc. Polypropylene
After the expanded yarn is picked, the bracket is full, the elasticity is good, suitable for cutting rugs, and can get the effect of nylon carpets.