Method and device for detecting pre-shrinking rate of preshrunk woven fabric

Abstract

The invention discloses a method and device for detecting a pre-shrinking rate of a preshrunk woven fabric. The method for detecting the pre-shrinking rate of the preshrunk woven fabric comprises a first fabric tension adjusting mechanism arranged on a cloth inlet side of a rubber blanket cloth shrinking unit, a second fabric tension adjusting mechanism arranged on a cloth outlet side of a wool blanket drying unit and a central processing unit. A first length measuring mechanism for measuring an operating length of the fabric is arranged on the cloth inlet side of the rubber blanket cloth shrinking unit, a second length measuring mechanism for measuring the operating length of the fabric is arranged on the cloth outlet side of the wool blanket drying unit, and the first fabric tension adjusting mechanism, the second fabric tension adjusting mechanism, the first length measuring mechanism, the second length measuring mechanism and the central processing unit are connected. By arrangingthe first fabric tension adjusting mechanism and the second fabric tension adjusting mechanism and carrying out regulation and control, it is ensured that tensile forces at two length measuring placesare equal when lengths of the fabric before and after preshrinking settle are measured. According to the invention, length percentages of the fabric before and after preshrinking settle can be preshrunk accurately and truly, and a current accurate fabric preshrinking rate is calculated.

Description

technical field [0001] The invention relates to a pre-shrinkage detection method and device, in particular to a pre-shrinkage detection method and device for fabrics running in a pre-shrinker, and belongs to the technical field of dyeing and finishing equipment and processes. Background technique [0002] During the process of dyeing, printing and finishing, the fabric will inevitably be stretched by the machine, so there is tension on the fabric. However, the tension is easily released after the fabric meets water, so we will find that the fabric shrinks after washing . In the actual dyeing and finishing process, the pre-shrinking machine is usually used to shrink the size of the fabric under wet and hot conditions, so that the original potential shrinkage of the fabric can be retracted before the finished product, so as to meet the shrinkage standard stipulated by the textile and prevent the textile from shrinking. After being processed into clothing, it shrinks when worn...

AI Technical Summary

Problems solved by technology

The detection device and method have the following disadvantages in the actual working process: since the length of the cloth is closely related to the tension in the warp direction of the fabric, the tension in the warp direction of the fabric is large, and the fabric will be extra elongated. Obviously, the first measurement in the device The fabric tension at the length measuring device is different from that at the second length measuring device. Since the fabric needs to be given a certain tension when it enters between the nip of the rubber blanket and the front guide roller, that is, the fabric tension at the first length measuring device is much greater than The tension at the second length measuring device and the length detection of the fabric (for example, elastic fabric) under different tension states will greatly affect the calculation results of the pre-shrinkage rate, making the pre-shrinkage rate obtained by the test less accurate. It cannot be used to guide and adjust the pre-shrinking process parameters

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