Industrial paper mold packaging products are environmentally friendly products that have emerged in recent years. Its main production processes are: beating process, forming process, drying process, and hot pressing and shaping process. Among the four major processes, the waste generated by the hot pressing and shaping process accounts for about 80% of the total waste of the entire production line. In response to this phenomenon, based on the experience accumulated in daily work, I will talk about the causes and countermeasures of waste products.
1. The surface of the hot pressing plastic mold made is not smooth and there are many blisters, which affect the quality of the product. Attention should be paid to the purchase of high-quality aluminum materials for sanding, and the finished molds should be smoothed with fine sandpaper.
2. The processed mold has uneven clamping distance between the upper and lower molds, and the product is easy to be shredded by the shaping. The mold should be processed in strict accordance with the specified scale, and the clamping distance between the upper mold and the lower mold should be equal.
3. When installing the mold on the shaping machine, the upper and lower molds are not parallel, causing serious mold rubbing. There should be a dedicated person to install the mold, and it is best to use an instrument to measure whether the upper and lower molds are parallel.
4. The quality of the purchased raw materials is unstable, the shrinkage rate of the product after drying does not match the original juice process, and the scrap rate is high during shaping. It is better to choose the corrugated paper edge and gray cardboard cut by the designated carton factory.
5. Improper mixing ratio of beating slurry results in high product damage rate. Different slurry formulas should be selected according to the different paper mold structures.
6. The same set of water molds produce products on different models of forming machines, and there are certain differences between their production, which leads to an increase in the scrap rate during the subsequent process of reshaping. The water mold should be fixed as far as possible to produce products on the same type of molding machine.
7. The drying product deforms greatly, which affects the overall quality. It should be noted that when people release wet products, they should be careful and grasp the angle of the discharge of different products, and control the drying curve according to different products.
8. The humidity of the molded wet product is not well controlled during drying, resulting in a high rate of plastic waste. The best drying temperature for different products should be mastered, and the humidity of the dried products should generally be 15-18%.
9. There is a large backlog of products after drying, long-time air-drying, low moisture content of the product, excessive shrinkage, and high rejection rate during shaping. A long-term backlog of dried products should be avoided, and moisture regain control should be carried out on drier products before shaping.
10. Insufficient operating experience of shaping workers, inaccurate shaping techniques, and high rejection rate. It is necessary to strengthen business training, continuously improve its work level, and adopt different methods of pressing, pressing, pinching, and pulling on different products to improve product quality.
