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Plastic tray molding
May 27, 2018

The first type: injection molding.

The plastic pallet products produced by the injection molding method are smooth, smooth, crisp, compact and have a high degree of product design freedom, and are divided into double-sided integrated plastic pallets and double-sided assembled plastic pallets.

The double-sided integral pallet generally has a self-weight of 15 kg/block or more, and the shape is relatively complex, requiring the production of injection molding machines with a clamping force of over 2,500 tons. Such trays are complex in shape, large in investment, and relatively high in cost, but due to fewer production processes, relatively high production efficiency and good product quality. General plastic processing plants use this method is not much.

Double-sided assembled pallets, that is, double-sided integrated trays are divided into upper and lower two pieces, which are assembled after injection molding. Although this product requires two molds, the mold structure is greatly reduced, the total investment of the mold is still cheaper than the overall type, and the requirements for the clamping force of the equipment are also reduced. The clamping force is 1,500 tons, and the general plastic processing plants are It's easier to do it. This production method may become the mainstream of plastic pallet production.

Second: Extrusion-Hollow blow molding.

The extrusion-hollow blow molding of plastic trays is similar to the general blow molding method for hollow products because the products are large and double-sided, requiring larger extruders, mold closing machines, and molds. At present, the domestic hollow molding machine manufacturers have developed a professional large-scale blow molding machine for high-speed production of high-strength blow molding machine, using HMWHDPE high-strength plastic production, molding speed, product quality, high strength, high stiffness, very long With the service life, the service life of general blow-molded pallets can reach 5 to 10 years, and they can work stably under the environment of -40~40°C. The dynamic load of its products can reach more than 3t, and the bending strength reaches a higher level. It is the preferred tray for long-life, high-strength use environments. Its price is higher than other plastic trays. Because of its long service life, its cost performance is the highest among all trays. This method, with the significant reduction in the price of molding equipment, has a great advantage in saving limited petroleum resources and saving logistics costs.

The third kind: vacuum suction molding method.

Plastic trays produced by vacuum plastic molding method are also available in both single-sided and double-sided types. Single-sided plastic trays are mostly used for packaging and transportation of small motors (such as vacuum cleaner motors, power tool motors, etc.) and wire trays, etc., which are developed rapidly and are mainly dedicated. Double-sided blister trays are assembled, divided into two types: the upper half is an extruded fixed-length, fixed-width plastic sheet, and the lower half is a large vacuum blister; the upper and lower sheets are large vacuum blister packs. Products. The method requires large-scale vacuum blister equipment for production molding. The equipment cost is low, and the cost of the mold is also low, but the product thickness is not uniform.

Fourth: Fourth, extrusion molding The plastic trays produced by this method are all assembled. That is, extruders, heads, and other equipment are used to extrude the slats used for the upper and lower panels and the I-shaped connecting plate with the composite wing as the connecting support, and then assembled. The emergence of wood-plastic composites has promoted the development of plastic extrusion trays. It is based on natural plant fibers (including wood flour husks, straw powder, rice bran, etc.) and waste plastics as the main raw material, so that plastic trays not only have a woody feel, but also have the advantages of water resistance and pest control, and can be planed, sawed and nailed. . Among the four molding methods, this method has the least investment in production equipment and molds, the lowest cost, the best performance-cost ratio, and Beijing, Guangdong and other places have already produced this product.

 


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