How to clean the injection machine screw
I. Purpose: Standardize the operation of cleaning screws, save raw materials, rapid production, and stable production.
Second, preparation before cleaning: 1, according to the production plan to confirm the materials and colors to be produced, check whether the material on the machine is clean. And figure out the residual material and color (that is, the last production) in the original screw to determine the material used for the cleaning screw (to use the powder). 2. Clean the injection molding machine workbench, and do not allow any debris on the injection molding machine before washing the screw to prevent the debris from getting into the cake. 3, set the required washing screw temperature, (except POM, PVC, TPE, TPU temperature must be higher than the original screw production temperature of 30 degrees), and prepare the tool to separate the block, as well as the pocket of the receiving block .
Third, the cleaning operation: 1, check whether the temperature of the material pipe is reached, and check whether the back pressure size meets the requirements. 2. Inject the residual material of the screw into the empty material and add the cleaning material. The storage material is fast >> slow >> fast >> injection, pay attention to carefully distinguish the injected material, when the material is found to be discolored, manually press the screw to re-inject, repeat After three or four times of movement, the material is stored by Fast >> Slow >> Fast >> Empty. It is necessary to repeatedly repeat the above two action screws to be truly cleaned. The separated primary colors and miscellaneous wastes are separated into different pockets. 3. If you want to produce transparent or crystal white products, you need a machine with a temperature above 250T. First remove the nozzle, burn it with gas, and then wash it with waste oil or cleaning solution.
4. After the aftermath, set the molding temperature required for the raw materials to be produced. 2. Clean the machine, return the remaining raw materials and the good blocks to the warehouse and powder room. 3. Register the raw materials used and the waste generated. weight
V. Key points: 1. Arrange the injection molding plan reasonably, and arrange the products of the same color or similar color materials on the same machine to achieve “multiple mold change and less washing machine”. 2, carefully distinguish the raw materials ejected from the material pipe, in addition to the waste material as waste, the color can be recycled and reused without impurities.
Sixth, note: 1, it is forbidden to use those plastic materials with very low sol temperature to wash the material pipe (such as: PU, TPR, TPE, TPU, etc.) 2, if you need to produce transparent products, can not be cleaned with POM, resulting in plastic material loss 3. The melting point temperature of the cleaning screw material should be higher than the melting point temperature of the residual material of the material tube. 4. If the raw material to be produced is the same as the raw material in the residual material tube, clean with the same material.