Talking about the reasons and countermeasures of the high scrap rate in the hot press molding process of paper mould products

Industrial paper mold packaging products are the environmental protection products that have emerged in recent years. Its main production processes include: beating process, forming process, and drying process. Among these four processes, the waste generated during the hot compaction process accounted for about 80% of the total scrap of the entire production line. In response to this phenomenon, the author talks about the causes and countermeasures of producing waste products based on the accumulated experience in daily work.
1. The surface of the hot-pressed plastic forming mold is not smooth and has many sand holes, which affects the product quality. Should pay attention to the purchase of high-quality aluminum for sanding, the mold to make a good use of fine sandpaper polished smooth.
2, the processing of the mold appears upper and lower mold mold spacing is uneven, the whole type easy to grind products. The mold should be processed strictly in accordance with the specified standards, and the distance between the upper mold and the lower mold should be equal.
3. When installing the mold on the molding machine, the upper and lower molds are not parallel, resulting in a serious wiper phenomenon. There should be someone to do the mold installation. It is best to use the instrument to measure whether the upper and lower molds are parallel.
4. The quality of raw materials purchased is not stable, and the ratio of the products after drying is not consistent with the original design process. It is better to buy corrugated cardboard, gray cardboard, and old newspapers, which are cut by fixed-point cartons.
5. Improper proportioning of beating pulp leads to high product breakage rate. Different slurry formulations should be selected according to the different paper mold structures.
6. The same set of water molds are used to produce products on different types of molding machines. There is a certain difference between the products, which leads to an increase in the rejection rate when the process is finished. The water model should be fixed as much as possible on the same type of molding machine.
7. Large deformation of the drying product affects the overall quality. Attention should be paid to the lightness of the entrance and release of the product and the angle of discharge of different products, and the drying curve should be controlled according to different products.
8. The humidity of the molded wet product is not well controlled during drying, resulting in a high rate of rejects. The best drying temperature for non-products should be mastered, and the dried products are generally suitable for 15-18% moisture.
9, a large number of products after drying, a long backlog of air drying for a long time, the product moisture content is low, the shrinkage is too large, the waste product rate is high. The long-term backlog of products after drying should be avoided, and the remodeling of dry products should be controlled.
10, Insufficient operating experience of the entire type of workmanship, inaccurate shaping techniques, and high rejection rate. Should strengthen the business training of the entire type of workers, and constantly improve its working level, take different press, press, pinch, pull and other methods for different products, improve product quality.