Method/Steps
1
Since there are many types of injection molding machines, it is necessary to correctly determine which type of injection molding machine or which specification series of injection molding machines should be used to produce this plastic product, such as general thermoplastic plastics, bakelite raw materials or PET raw materials, whether it is single color, two colors, multiple colors, sandwich or mixed colors. In addition, some plastic products have special requirements: such as high stability (closed loop), high precision, ultra-high shooting speed, high shooting pressure or fast production, etc., and the appropriate series must also be selected for production.
2
Determine whether the "large column inner distance", "mold thickness", "minimum mold size" and "mold plate size" of the machine are appropriate based on the mold size to confirm whether the mold can be placed. Determine whether the "mold opening stroke" and "mold ejection stroke" are sufficient to allow the plastic product to be taken out based on the mold and plastic product. The "clamping force" tonnage is determined by the plastic product and plastic type.
3
The number of mold cavities (how many cavities in one mold) must be considered when calculating the weight of the finished product; for stability, the injection volume must be more than 1.35 times the weight of the plastic product. The conditions such as "screw compression ratio" and "injection pressure" are determined by the type of plastic.
Some finished products require high injection rate and injection speed to form stably, such as ultra-thin finished products. In this case, it may be necessary to confirm whether the injection rate and injection speed of the machine are sufficient, and whether it is necessary to use accumulators, closed-loop control and other devices. Generally speaking, under the same conditions, screws that can provide higher injection pressures usually have lower injection speeds, and conversely, screws that can provide lower injection pressures usually have higher injection speeds. Therefore, when selecting the screw diameter, the injection volume, injection pressure and injection rate (injection speed) need to be cross-considered and traded off.
