1 Reduce draw marks in shaping production
During the operation of the shaping machine, the main processes include: rolling car, upper overfeeding, lower overfeeding, main chain, Brush, cloth release and drop cloth, etc.
In fact, to make a simple distinction, the main process of the stenter setting machine can be divided into two processes: stenter and setting, specifically:
First of all, the main process of the setting machine, the so-called tenter process, actually mainly refers to applying a certain pulling force to the weft direction of the fabric, so as to remove the tension generated by the force during the pre-treatment and dyeing process. Disadvantages such as uneven fabric edges, skewed wefts, and uneven widths. In other words, after this process, the surface quality of the fabric will be significantly improved.
The second step is the shaping process. Specifically speaking, it is to first set a suitable tension for the tenter shaping machine and then process the fabric. First, it is heated to a certain temperature and then maintained for a certain period of time. In this way, the fiber molecular chains are readjusted in their new positions. Then, it is cooled at an appropriate speed to fix the thermal changes of the fabric.
In general, after the setting process of the tenter setting machine, the wrinkles contained on the fabric can be removed, and at the same time, new wrinkles can be prevented from appearing. In other words, after treatment, the surface quality of the fabric can be significantly improved, making it look more beautiful.
For some fabrics, it is often necessary to use tenter setting machine equipment for pre-shaping treatment before dyeing and printing. The advantage of this is that it can reduce undesirable phenomena such as pull marks. For example, when processing stretch fabric, because it contains relatively high spandex, the shrinkage of spandex and silk are different, and the silk is harder than other raw materials. If a tenter setting machine is not used for pre-shaping, it is likely to occur during the later printing and dyeing process. Imprints etc.
In addition, there are many finished products that also require stenter and shaping machine equipment for shaping. For example, for nylon gray fabric, during this process, the setting temperature should be maintained between 160°C and 180°C, and the setting speed should be controlled between 20 meters and 25 meters per minute.
At the same time, the setting temperature of the stenter setting machine must be reasonably controlled. This is because the setting temperature changes greatly in color, especially purple, pink blue, etc. Therefore, it is necessary to pay attention to whether the color before and after treatment is the same. In addition, it should be noted that the thickness of nylon fabrics is different, so the shrinkage rate is also different. Nylon fabrics are prone to yarn snagging when setting. If there is a line of yarn snagging all the way through the setting, the machine should be stopped immediately and the machine head and tail, bellows, and rollers should be inspected and polished with sandpaper or padded cloth.
In addition, in the process of using stenter setting machine equipment to shape polyester cloth, the setting temperature is generally controlled between 170°C and 200°C, and the setting speed is per Minutes 20 meters to 28 meters.
It should be noted that in the process of shaping polyester poppy fabric, the shaping temperature of the tenter shaping machine must be reasonably controlled, and the center of the fabric must also be taken into consideration. , the edge is thick and thin, the machine speed is slowed down, and it is usually pulled in two times. This is because setting it twice can reduce the thickness difference between the middle and the edges.
2 Setting machine running control
We know that once the If the web setting machine has edge running problems, the consequences are often very serious. Therefore, after finding out the specific cause, we must deal with it immediately to avoid more serious consequences. So, how to control it? First of all, when we operate the stenter setting machine, we should pay attention to the operating status of the equipment.
During the operation of the stenter setting machine, the stacking status of the fabrics waiting to be processed should also be checked and adjusted in advance to ensure that the stacking is adjusted. In this way, when feeding the cloth During the process, its stability can also be ensured.
Secondly, the staff should also appropriately adjust the distance between the door width and the edge suction device based on the actual processing conditions, and also adjust its pressure appropriately.
The third point is that when inspecting fabrics, defective fabrics should be picked out in advance to prevent edge running due to bad edges.
Fourthly, we also need to set up a baffle or ruler wheel on the crossbar at the cloth inlet end of the stenter setting machine, which can reduce the lateral changes in the cloth surface and at the same time You can also swing it from side to side to avoid running sideways.
Fifth, staff should operate the stenter setting machine correctly and try to ensure its stable operation. In addition, the tension of the machine needs to be appropriately adjusted according to the tightness of the fabric structure. Remember, do not use too much tension, otherwise bad edges or running edges will occur. If the equipment is also equipped with an overfeeding device, attention should be paid to controlling the overfeeding to avoid needle detachment and overshooting.
Finally, during the operation of the stenter setting machine, we also need to pay attention to the surrounding environmental conditions. For example, a larger screen can be used to solve the problem of interference from sudden winds. At the same time, equipment should be inspected and maintained regularly, and damaged parts should be replaced in a timely manner.
3 Main control factors of the shaping process
What is the process of the shaping machine? , should be judged based on three factors, namely temperature,time and tension.
1. Temperature
The fabric is processed using a tenter setting machine During heat setting, the control of temperature will determine the quality of its qualitative quality. Because after heat setting, the extent to which the wrinkles on the original surface of the fabric are eliminated, the surface smoothness is improved, the dimensional thermal stability and other wearing properties of the fabric are closely related to the heat setting temperature.
2. Time
Before finalizing, a certain amount of time must be reached. temperature can be carried out, which requires heating. Therefore, setting time is another important process condition for heat setting of the stenter setting machine. After the fabric enters the heating zone, the time required for heating and setting can be roughly divided into the following parts: heating time, heat penetration time, molecular adjustment time and cooling time.
Usually, the quality control of the heat setting process of the stenter setting machine mainly refers to the control of heating time, heat penetration time and molecular adjustment time, but does not include Cooling time. If the item is regarded as a preheating effect, then the setting time only refers to the time required for the second and third items, that is, the time required for heat penetration and molecular adjustment.
In general, the quality of the heat setting process of the tenter setting machine is mainly reflected in the performance, area, weight, thermal conductivity of the fiber and the moisture content of the fabric during setting. Fabrics and other different factors, in terms of control of the time required for heating and heat penetration.
3. Tension
Due to the tension on the surface of the fabric, Changes will occur under certain conditions, which will affect the dimensional thermal stability, strength and elongation at break of the fabric. Especially in the heat setting process of the stenter setting machine, 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 width stretching degree. .
So, control the three factors of temperature, time and tension when using the stenter setting machine for the shaping process. , which basically guarantees the quality of the process. </p
