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Reduce the quality problems of the fabric stenter setting machine

Views: 11     Author: Site Editor     Publish Time: 2021-12-15      Origin: Site

Fabric setting time and heat source performance determination

During the working process of the stenter setting machine, its temperature is the main factor affecting the quality of heat setting. During the operation, the original wrinkles are eliminated after the heat setting of the fabric, and the surface smoothness is improved. The dimensional thermal stability and other wearing properties of the fabric are closely related to the level of heat setting temperature.

The setting time of the stenter setting machine is another main process condition for heat setting. After the fabric enters the heating zone, the time required for heating and setting can be divided into the following parts:china fabric for pockets - DADITEXTILE

1. Heating time: the time required to heat the surface of the fabric to the setting temperature after the fabric enters the heating zone.

2. Heat penetration time: After the fabric surface reaches the setting temperature, the fibers in all parts of the fabric inside and outside have the same heat penetration time required for the setting temperature.

3. Molecule adjustment time: After the fabric reaches the setting temperature, the time required for the molecules in the fiber to adjust according to the setting conditions.

4. Cooling time: the time it takes for the fabric to leave the drying room to make the size of the fabric fixed for cooling.

The setting time usually referred to by the stenter setting machine usually refers to the time required for the first three items, and to a certain extent does not include the fourth item. If one item is regarded as a kind of preheating effect, then the setting time only refers to the time required for the second and third items, that is, the time required for thermal penetration and molecular adjustment.

The time required for heating and heat penetration depends on the performance of the heat source, the weight per unit area of the fabric, the thermal conductivity of the fiber and the moisture content of the fabric. During the heat setting process, the tension of the fabric has a certain effect on the quality of the setting, including the dimensional thermal stability, strength and elongation at break of the fabric.

The thermal stability of the warp direction increases with the increase of the warp overfeed during setting, while the thermal stability of the weft direction decreases with the increase of the degree of stretching of the door width.

The average single yarn strength of the finalized fabric is slightly higher than that of the unshaped one, and the change in the weft direction is more obvious than that in the warp direction.

After setting the fabric's breaking elongation, the weft direction decreases as the extension degree increases, while the warp direction increases as the overfeed increases.

Control analysis of shaping process conditions of shaping machine

In the process of using the stenter setting machine, the quality of the cloth can be further improved through soft processing, so that it can meet the requirements of customers. In addition, it can also make it not easy to scratch on the cloth guide wheel; in addition, the use of a stenter setting machine can also help to keep the fabric surface flat and stable in size, and can also eliminate wrinkles and creases formed during the dyeing and finishing process. .

It should be noted that, in order to achieve such an ideal effect, in the process of operating the stenter setting machine, it is necessary to reasonably formulate suitable setting process conditions.

First of all, the setting temperature is generally determined with reference to the elastic shrinkage rate and thickness of the fabric. If the set temperature is too high, the strength will decrease, the elasticity will decrease, and the fabric may change color. On the contrary, if the temperature is too low, the fabric will be curled, the width will be unstable, and the shrinkage will be large.

The second is to reasonably control the speed of the stenter setting machine equipment. Under normal circumstances, its operating speed mainly depends on the length of the shaping zone and the level of shaping temperature. If the vehicle speed is too fast, it will affect the shaping effect, and it may also cause the fine wrinkles in the dyeing and finishing process to not be removed. On the contrary, if the vehicle speed is slow and the temperature is high, it may cause yellowing of the fabric and decrease in elasticity.

In addition to the above two conditions, another process parameter that needs to be reasonably controlled is the overfeeding of the stenter setting machine equipment. Generally, after determining the fabric width, it is necessary to set the appropriate overfeed amount and tension.

It should be noted that during the operation of the stenter setting machine, the selection of this parameter will affect the fabric's weight, elasticity, and wrinkles in the finishing of the fabric. For example, if the fabric tension is small, the overfeed is large, and the fabric surface is uneven, it is difficult to eliminate the fine wrinkles produced during the dyeing process of the fabric. Conversely, high tension and small overfeeding will cause curling during heat setting.

Common quality problems in the post-processing of the setting machine

The stenter setting machine is very important for the post-processing of textile products. However, there are some common problems in the use process.

Common problem 1: The cloth coming out of the stenter setting machine has colored pollution, oil stains, or color stains.

To solve this problem, the recommended correct operation steps are:

1. Turn off the stenter setting machine and check if there is any such problem before production;

2. If it is found, it must be approved by the supervisor on duty. If it is not, the questions that should be paid attention to include: whether dyed cloth has been done before or the finished product that is easy to discolor; whether there is a cloth strip on the needle board, enter the oven Whether there is oil stains on the front supporting rods; whether the chemical material is uniform when doing whitening or padding, etc., and deal with it according to the actual situation.

Common problem 2: Scratches on the cloth coming out of the stenter setting machine.

For this problem, you should also check whether there is such a problem before. If there is, you need to work after the supervisor on duty agrees. If it does not, you should check whether the cloth on the machine is rubbed on hard objects or whether the rollers are damaged. Burr, whether the pressing wheel is too tight, the above will cause scratches on the cloth of the stenter setting machine, and it must be adjusted before starting to work.

Common problem 3: The cloth coming out of the stenter setting machine has a moon-curved shape and a dead wrinkle mark.

For the same reason, first check whether there are any such problems before, and if there are any, you can proceed with the work after obtaining consent. If not, you need to check whether the needles on the machine are normal, the overfeeding is too large and the needles are easy to fall off, the crimping brush is not good, the position of the crimping wheel is too high, the pressure is not adjusted properly, the needle or the needle plate is not aligned, and the cloth is fed Hemming, the above will cause problems such as stitching or curling in the fabric of the stenter setting machine, and it must be repaired before starting to work.

Frequently asked questions 4: The cloth edge snags from the stenter setting machine.

For this problem, the correct operation method is recommended: first check whether the needle surface of the needle plate is normal and whether there are traces of scratches. If the brush wheel bristles are lost, it will directly affect the needle surface and cause the needle tip to become hairy. As a result, the stenter setting machine has a problem of snagging on the edge of the cloth, and it needs to be replaced before it can work.


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