The first: injection molding plastic tray
The plastic tray products produced by injection molding method are flat, smooth, structured and dense, and the product design freedom is large, which is divided into single-sided integral plastic pallets and double-sided integral and assembled plastic pallets.
Double-sided integral pallets generally weigh more than 15 kg / block, the shape is more complex, requiring clamping force of more than 2500 tons of injection molding machine production. This type of pallet has a complex shape, large investment, and relatively high cost, but due to the small number of production processes, the production efficiency is relatively high and the product quality is better. Generally, plastic processing plants use this method not much.
Double-sided assembly pallet, that is, double-sided integral pallet is divided into upper and lower pieces, which are injection molded and then assembled. Although this product requires 2 pairs of molds, but the mold structure is greatly simplified, the total investment in the mold is still cheaper than the integral type, and the requirements for the clamping force of the equipment are also reduced, the clamping force ≥ 1500 tons, and the general plastic processing plant is relatively easy to do. This mode of production may become the mainstream of plastic pallet production.
The second type: blow molding plastic trays
The extrusion-hollow blow molding of plastic trays is similar to the general blow molding method of hollow products, because its products are large and double-sided, requiring larger extruders, clamping machines and molds. At present, the domestic hollow molding machine manufacturers have developed a professional high-speed production of high-strength blow molding tray of the super large hollow molding machine, the use of HMWHDPE high-strength plastic production, fast molding speed, good product quality, with high strength, high stiffness, very long service life, the general blow molding tray service life can reach 5 to 10 years, while can be stable work in the environment of -40 ~ 40 °C. The dynamic load of its products can reach more than 3t, and the bending strength can reach a high level. It is the preferred pallet for some needs long life, high-intensity use environment, its price is higher than other plastic pallets, because its service life is particularly long, so its cost performance is the highest of all pallets. With the significant reduction of the price of molding equipment, this method has great advantages for saving limited petroleum resources and saving logistics costs.
The third kind: blister plastic tray
There are also two types of plastic trays produced by vacuum blister molding. Single-sided blister trays are mostly used for small motors (such as vacuum cleaner motors, power tool motors, etc.) and wire trays and other packaging, transportation, rapid development, and mainly dedicated. The double-sided blister tray is assembled and divided into 2 forms: the upper half is extruded with a fixed length and a fixed width plastic plate, and the lower half is a large vacuum blister product; the upper and lower half are large vacuum suction plastic products. The production of this equipment requires large vacuum blister equipment, the equipment cost is lower, the mold cost is also lower, but the product wall thickness is uneven.
The fourth type: rotomolded plastic trays
The rotomolded plastic tray is relatively large, put the plastic particles into the mold to heat, and then keep rolling the mold to make the plastic and the mold wall paste into a composite shape. Mold prices are cheap, product prices are expensive, the main sum of the production of hollow, packaging and super large products, the size shrinkage ratio is relatively large, the constant is very low and so on. Rotational molding is extrusion + compression, and the non-cutting of rotational molding must have burr. Of course, the detailed difference should be based on product characteristics and requirements.