Plastic pallets are available in the following four ways:
The first type: injection molding.
The plastic pallet products produced by injection molding are flat, smooth, crisp and compact, and have a wide degree of product design freedom. They are divided into double-sided integral plastic trays and double-sided assembled plastic trays.
The double-sided integral tray generally has a weight of more than 15 kg/block, and the shape is relatively complicated, requiring an injection molding machine with a clamping force of more than 2,500 tons. The trays are complex in shape, large in investment, and relatively high in cost. However, due to fewer production processes, the production efficiency is relatively high and the product quality is good. There are not many methods used in general plastic processing plants.
The double-sided assembled tray is divided into upper and lower two-piece trays, which are respectively assembled by injection molding. Although this product requires 2 sets of molds, the mold structure is greatly reduced, the total investment of the mold is still cheaper than the whole type, and the requirements for the clamping force of the equipment are also reduced. The clamping force is ≥1500 tons, and the general plastics processing factories are all It's easier to do. This type of production may become the mainstream of plastic pallet production.
Second: extrusion-hollow blow molding.
The extrusion-hollow blow molding of the plastic tray is similar to the general hollow product blow molding method, and because of its large size and double-sided type, a larger extruder, a mold clamping machine, and a mold are required. At present, domestic hollow molding machine manufacturers have developed a large-scale hollow molding machine that specializes in high-speed production of high-strength blow molding trays. It is produced by HMWHDPE high-strength plastics, with high forming speed, good product quality, high strength, high rigidity and very long 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 °C. The dynamic load of its products can reach more than 3t, and the flexural strength reaches a high level. It is the preferred tray for long-life, high-intensity environments. It is more expensive than other plastic trays because of its long service life, so its price/performance ratio is the highest among all pallets. This method has a great advantage in saving limited oil resources and saving logistics costs as the price of molding equipment is greatly reduced.
The third type: vacuum forming method.
Plastic trays produced by vacuum forming are also available in single-sided and double-sided versions. Single-sided blister trays are mostly used for packaging and transportation of small motors (such as vacuum cleaner motors, electric tool motors, etc.) and wire trays. They are developed rapidly and are mainly used exclusively. The double-sided blister trays are assembled in two forms: the upper half is an extruded fixed length, fixed width plastic sheet, the lower half is a large vacuum blister; the upper and lower half are large vacuum blister product. The method requires large-scale vacuum blistering equipment for production molding, the equipment cost is low, the mold cost is also low, but the product wall thickness is not uniform.
The fourth type: The fourth is the extrusion molding method. The plastic trays produced by this method are all assembled. That is, an extruder, a machine head, and the like are used to extrude the slats for the upper and lower panels and the I-shaped connecting plates with the compound wings for the connection support, and then assemble them. The advent of wood-plastic composites has driven the development of plastic pallets for extrusion molding. It is based on natural plant fiber (including wood powder husk, straw powder, rice bran, etc.) and waste plastics, so that the plastic tray has the advantages of woody, water and insect resistance, and can be planed, sawed and nailed. . Among the four molding methods, the production equipment and molds have the least investment, the lowest cost, and the best performance-price ratio.