Some common problems and solutions in sanding finishing

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Talk about some common problems and solutions in sanding finishing

Crinkle print


If the sanding products are improperly processed, regular or irregular warp and weft creasing may be produced on the fabric surface, which will seriously affect the appearance quality of the products and the sanding effect. The main reasons for the creasing and the measures to be taken are as follows:

 

(1) The fabric is stacked in a folded (or wrinkled) state for a long time, and is pressed by its own gravity, resulting in irregular and uneven warp and weft wrinkle prints on the surface of the fabric. For this reason, the storage method of the fabric should be changed to a large roll (stack) roll storage, which can effectively prevent creasing.

 

(2) In the pre-grinding process of the fabric, the falling temperature is too high, resulting in relatively permanent wrinkling, which is mainly for chemical fiber and its blended fabrics. These creases are difficult to remove and often require a styling session. For cotton-type or lightly wrinkled fabrics, it can be solved by spraying wet and drying equipment before the sanding machine.

 

(3) In the fabric pre-treatment and dyeing process, due to process, equipment and operation problems, or due to improper seam, crumpling stripes can be caused. Therefore, in order to overcome the embossing and printing defects of sanded products, each process should be strictly controlled.

 

Usually in the process of sanding, the original weft wrinkle can be removed from the fabric, but the warp wrinkle cannot be removed, leaving uneven fluff and different shades on the surface of the fabric.

white core


The white core is produced by sanding the surface of the fabric, mainly due to the neps left on the grey fabric. After dyeing, these neps can be covered, but once sanded, the neps are ground away and white spots are left, and even small cracks are caused in serious cases. Holes, affecting product quality. Therefore, for the original grey fabric, it is required to minimize the neps, or to pick the neps to the reverse side of the fabric; the process of grinding before dyeing and dyeing after grinding can also be used to restrain the white core defect.

 

 

03
stripes


cause

(1) The surface of the sanding roller is uneven or the sand skin is improperly covered, resulting in uneven abrasive grains and streaks.

(2) Grinding rollers are used to grind narrow fabrics first and then wide fabrics. Due to the uneven wear of the surface of the grinding roller, it is easy to cause grinding and edge difference, resulting in stripes on both sides.

 

Solution

(1) The emery skin should be flat and rolled with the guide roller, the guide drop should be straight, the surface should be flat, and it should be kept clean and free of dirt.

(2) The emery skin should be wrapped in an oblique or strip-shaped way, and both ends should be rolled firmly.

(3) Regularly check the equipment to ensure that the guide roller is flat and that the sand skin and the guide roller are in good adhesion.

A good fabric plant can solve above issues.

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