Production process of plastic pallets

Plastic pallets have the following four molding methods:

The first: injection molding method.

The plastic pallet products produced by the injection molding method are flat, smooth, crisp and dense, and have a greater degree of freedom in product design. They are divided into double-sided integral plastic pallets and double-sided assembled plastic pallets.

The double-sided integral tray generally has a dead weight of more than 15 kg/block, and has a complex shape, requiring the production of an injection molding machine with a clamping force of more than 2,500 tons. This type of pallet has a complex shape, a large investment and a relatively high cost, but due to fewer production processes, the production efficiency is relatively high, and the product quality is better. Generally, plastic processing plants do not use this method much.

Double-sided assembled tray, that is, the double-sided integrated tray is divided into two upper and lower pieces, which are separately injection molded and then assembled. Although this product requires 2 pairs of molds, the mold structure is greatly reduced, and the total investment of the mold is still cheaper than that of the integral type. At the same time, the requirements for the clamping force of the equipment are also reduced. The clamping force is ≥ 1500 tons. easier to do. This production method may become the mainstream of plastic pallet production.

The second: extrusion - hollow blow molding method.

Extrusion of plastic pallets - hollow blow molding is similar to the general blow molding method of hollow products, because the product is large and double-sided, requiring larger extruders, clamping machines and molds. Domestic blow molding machine manufacturers have developed a super-large blow molding machine that specializes in high-speed production of high-strength blow molding trays. It is produced with HMWHDPE high-strength plastic, with fast molding speed, good product quality, high strength, high rigidity, and very long use. The service life of the general blow molding tray can reach 5~10 years, and it can work stably in the environment of -40~40℃. The dynamic load of its products can reach more than 3t, and the bending strength has reached a high level. It is the first choice for some pallets that require long life and high-intensity use environments. Its price is higher than other plastic pallets. Because of its particularly long service life, its cost performance is the highest among all pallets. This method has great advantages for saving limited petroleum resources and saving logistics costs as the price of molding equipment is greatly reduced.

The third type: vacuum forming method.

There are two types of plastic trays produced by vacuum forming method: single-sided and double-sided. Single-sided blister trays are mostly used for packaging and transportation of small motors (such as vacuum cleaner motors, power tool motors, etc.) and wire trays. They have developed rapidly and are mainly dedicated. The double-sided blister trays are assembled and divided into two forms: the upper half is an extruded fixed-length and fixed-width plastic sheet, the lower half is a large vacuum blister product; the upper and lower half are large vacuum blister product. This method requires large vacuum forming equipment, the equipment cost is low, the mold cost is also low, but the product wall thickness is not uniform.

Fourth: The fourth is the extrusion molding method. The plastic trays produced by this method are all assembled. That is, using extruder, machine head and other equipment to extrude the slats used as the upper and lower panels and the I-shaped connecting plate with double wings as the connection support, and then assemble. The emergence of wood-plastic composite materials has promoted the development of extrusion molding plastic pallets. It uses natural plant fibers (including wood flour, husk, straw powder, rice bran, etc.) and waste plastics as the main raw materials, so that the plastic tray not only has a woody feel, but also has the advantages of water resistance and pest control, and can be planed, sawed, nailed . Among the four molding methods, this method has the least investment in production equipment and molds, the lowest cost, and the best performance-price ratio.