Generally speaking, enterprise or department managers and related technicians who have been engaged in the plastic products industry for many years have the ability to judge and choose a suitable Wholesale pet injection moulding machine for sale for sale because of their experience in using injection moulding machines.

　　However, many enterprise or department managers may not know about injection molding machines, or do not have professional technical personnel to provide reference, so they need the assistance of injection molding machine manufacturers to decide which type, which model, which parameter of injection molding machine to use, or even Customers may only have samples or ideas of plastic products, and then directly ask the injection molding machine manufacturer whether the machine can be produced, or directly ask which model is more suitable.

　　In addition, some special products may need to be equipped with special devices such as accumulator, closed circuit, injection compression, etc. in order to be produced more efficiently, and these can only be known by senior technicians or after actual production.

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　　The factors for choosing Wholesale pu injection machine for sale type, specification and brand mainly include mold, product, plastic, molding requirements, etc. Therefore, you must know the following information before making a choice:

　　1. Mold size (width, height, thickness), weight, special design, etc. required for plastic products;

　　2. The type and quantity of plastic in plastic products (single raw material or multiple plastics);

　　3. Appearance dimensions (length, width, height, thickness), weight, etc. of injection molded products;

　　4. Molding requirements of plastic products, such as quality conditions, production speed, etc.

　　After the information is prepared, the selection of Wholesale metal injection molding machine for sale can be made in the following order:

　　Since there are many types of injection molding machines, it is necessary to correctly determine which type of injection molding machine or which series of injection molding machines this plastic product should be produced by, such as general thermoplastics or bakelite raw materials or PET. Raw materials, etc., are single-color, two-color, multi-color, interlayer or mixed color, etc.

　　In addition, some plastic products have special requirements: such as high stability (closed loop), high precision, ultra-high injection rate, high injection pressure or rapid production (multi-loop), etc., the appropriate series must also be selected for production.

　　2. Determine whether the "large column inner distance", "mold thickness", "mold minimum size" and "mold size" of the machine are appropriate according to the size of the mold, so as to confirm whether the mold can be placed.

　　3. It is determined by the mold and plastic products whether the "opening stroke" and "supporting stroke" are sufficient to allow the plastic products to be taken out.

　　4. The tonnage of "clamping force" is determined by the plastic product and the type of plastic. Since the plastic raw material will be injected into the mold cavity at high pressure, a force to support the mold will be generated. The clamping unit of the injection molding machine must provide enough "clamping force" to prevent the mold from being opened.

　　5. Determine the required "shot volume" and select the appropriate "screw diameter" by the weight of the finished product and the number of mold cavities.

　　# Calculate the weight of the finished product to consider the number of mold cavities (one mold several cavities);

　　# For the sake of stability, the injection volume should be more than 1.35 times the weight of the finished plastic product.

　　6. Conditions such as "screw compression ratio" and "injection pressure" are determined by the type of plastic. Some engineering plastics require a higher injection pressure and a suitable screw compression ratio design to have a better molding effect. Therefore, in order to make the finished product shoot better, it is also necessary to consider the injection pressure requirements and compression ratio issues when selecting a screw. . In general, smaller diameter screws provide higher injection pressures.

　　7. Confirmation of "Injection Speed". Some finished products require high injection rate and rapid injection to be stable, such as ultra-thin products. In this case, it may be necessary to confirm whether the injection rate and injection rate of the machine are sufficient, and whether it needs to be equipped with accumulator, closed-loop control and other devices.

　　In general, under the same conditions, a screw that can provide higher injection pressure usually has a lower injection rate, and conversely, a screw that can provide a lower injection pressure usually has a higher injection rate. Therefore, when selecting the screw diameter, the injection volume, injection pressure and injection rate (injection speed) need to be cross-considered and chosen.

　　Wholesale metal pu pet injection molding machine for sale, for more information on injection molding machines, please contact us.