Quality control is an important aspect of improving product quality, and the idea of ”quality first” must be implemented in all production operations. Actively preventing man-made yarn defects and sudden yarn defects in the spinning process is one of the effective ways to ensure product quality.
To prevent man-made defects, we must implement five preventions
1. Prevent roving defects
To improve the quality of wrapping, it is necessary to remove the flying flowers on the surface of the roving including the inclined surface. After wrapping, pay attention to the yarn tail not to be coiled with roving, and not to have empty roving (especially the upper part). Row).
2. Prevent joint defects
To improve the quality of joints, three checks should be done before jointing (Check roving, check collector, check sliver). If you encounter a white spot when connecting, pull it out and reconnect it. If the flying yarn is not attached to the yarn sliver, the winding roller and rubber roller must be interrupted and cleaned. Do not use joints with oily hands (such as spindle reels, wiping roller necks, twisting roller seats, rubber stripping rollers, wiping steel plates, sweeping the floor, etc. Wipe your hands clean).
3. Prevent thick warp and thick weft yarns
Pull out the spindle and end the roving Good, prevent double roving from feeding.
4. Prevent tight twisting and de-weft yarn
It is strictly prohibited to operate with one hand and carry the yarn with the other hand.
5. Prevent cleaning work defects
Be aware of both hands and eyes, and resolutely perform cleaning In the operation method, it is strictly forbidden for flying flowers to attach to the yarn sliver and cause yarn defects.
To prevent sudden yarn defects, we must strictly control four levels
1. Flat wipe Cheguan
After wiping the car flat or replacing the rubber rollers, open the first doffing and pay attention to quality changes (such as uneven evenness, light and heavy yarns, oily yarns, bobbin forming, end breakage, etc.), and if any abnormalities are found, Make corrections immediately.
2. Process modification level
According to the process requirements, master the color of the bobbin, traveler, roving, etc. used after modification to prevent misbranching.
3. Turn off the car after a meal
Before driving, be sure to clean the sunroof, The lampshade is attached to the machine and the flying flowers on the yarn strips to prevent slub yarn or broken ends.
4. Turn off the cold car
Make preparations before driving and pay attention to the traction After checking the stretching parts and pressurization conditions one by one, pay attention to the apron removal and bobbin forming. In the case of many broken ends, it is especially necessary to prevent the occurrence of human defects.
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