Today, the Indian craftsman collects some of the faults and solutions that are easy to occur in the flexible packaging cutting process (only common problems), this article is also worthy of your collection.
Vertical stripes
A large amount of air entrapment and cumulative thickness tolerance during the slitting/rewinding process are the main causes of longitudinal streaks, and it is difficult to eliminate the occurrence of more severe strips. One of the reasons is that the cutting speed is too fast. In general, quality problems such as vertical streaks and split layers are most likely to occur at high speeds. Secondly, the running accuracy of the equipment is high for the equipment with high running precision. After a long period of continuous use, the running accuracy of some parts has been reduced. For large slitting machines, it is more difficult to ensure the running accuracy due to the large running parts. Moreover, since the plastic film is a polymer product, its thickness is very thin, and it is more susceptible to damage during processing. Therefore, once the running accuracy is insufficient, quality problems such as vertical streaks are likely to occur. For this reason, it should be cautious when replacing equipment parts and accessories. It is advisable to use durable and high-precision parts, and it must also ensure a certain precision during installation. Otherwise, it is difficult to meet the operation requirements of the slitting machine.
Split layer
The phenomenon that a part of the film is staggered on the end face of the film roll is caused by the sliding of the film during the winding process or the change of the film width. The staggered layer is firstly related to the slitting speed, and the acceleration and deceleration are too rapid. For a smooth film, the slippage is likely to cause a staggered layer, and the speed should be slowed down . If the film roll is too tight, the film will be laterally slipped. If the film roll is too loose, air will be trapped, which will cause the film roll end to be staggered. The tension should be adjusted.
Bottom wrinkle
The under wrinkles only occur in a length of the film winding start, which is characterized by wrinkles and streaks and deep, which is caused by a variety of factors. For example, in the process parameters, different types of slitting machines, the setting method, method and value of the process parameters are different. For example, the old-fashioned slitter controls the winding tension by manually adjusting the winding motor voltage and uses the mechanical friction resistance to obtain the unwinding tension, while the new slitter uses the computer to control the winding and unwinding motors according to the input process parameters. The proper setting of the take-up and unwinding tensions is fundamentally different. The performance of the device itself and the intrinsic properties of the film have a great influence on the quality of the film slitting and winding, but a suitable process can improve the quality problems such as vertical streaks and under wrinkles. Different equipment and different types of membranes should adopt appropriate slitting process. When the equipment condition changes, it can be compensated by process adjustment, but the process adjustment must be cautious.
In addition, the most important raw and auxiliary materials for the slitting process are the paper core and the large shaft film roll. The quality of the paper core and the large shaft film roll not only affect the slitting speed, but also closely related to the longitudinal stripe and the bottom wrinkle. It requires process control, incoming inspection and A combination of final inspections is used to enhance monitoring and stabilize the quality of the large shaft roll and the raw and auxiliary materials . For example, in the case of a paper core, the wide slitting machine uses a longer paper core (up to 2 meters or more) and rotates at a high speed as the center of the film winding, its straightness, concentricity, strength, and surface finish. Other indicators are the most important. In general, the wider the paper core, the more difficult it is to ensure straightness and concentricity. A paper core with a good quality should be within 0.04%, and a film with a surface roughness of less than 0.2 μm should be used for a film of 10 μm or less. The quality of the paper core is not only related to its manufacture, but also closely related to the conditions of storage and transportation. If the quality of the paper core is found to be abnormal, it should be replaced in time.
Sharp edge
The curling occurs at the edge of the film winding, and the edge of the thick film is wound up and the edge portion is lifted. The common reason is that the cutter is too blunt, and the stretching phenomenon occurs at the slit when slitting, which causes the edge of the film roll to be turned outwards after the rewinding, resulting in warping. In this case, the cutter should be replaced in time to avoid the occurrence of the curling problem. . The tool is not installed correctly, the winding speed is too fast, and the curling is easy to occur when the winding is too tight.
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