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Before starting the injection molding machine, it is necessary to conduct a preliminary inspection of the injection molding machine to check whether various safety devices are effective, and whether each travel switch is normal, check the amount of lubricating oil, and lubricate the injection molding machine.
injection molding machine need do what before injection molding?
1. Pretreatment of raw materials
According to the characteristics of the plastic and the supply of materials, the appearance and process performance of the raw materials should generally be tested before molding. If the plastic used is in powder form, such as polyvinyl chloride (PVC), it should also be batched and dry blended; if the plastic part has color requirements, you can add an appropriate amount of colorant or color masterbatch; the supplied pellets often contain different The degree of moisture, solvents and other volatile low-molecular-weight substances, especially some plastics with a tendency to absorb moisture, always exceed the allowable limit for processing. Therefore, it must be dried before processing and the water content must be measured. The moisture content of polycarbonate (PC), which is sensitive to water at high temperatures, is required to be below 0.2%, even 0.03%-0.05%, so vacuum drying ovens are commonly used for drying. The dried plastic must be properly sealed and stored to prevent the plastic from absorbing moisture from the air and losing the drying effect. For this reason, the use of a dry hopper can continuously provide dry hot materials for the injection molding machine, which is useful for simplifying operations, maintaining cleanliness, and improving quality. It is beneficial to increase the injection rate. The filling amount of the drying hopper is generally 2.5 times the hourly consumption of the injection molding machine.
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