There are two types of custom-made paper trays, one is dry pressed paper trays, and the other is wet pressed paper trays. The distinction between the two types is clearly defined. Wet-pressed paper trays are very common packaging in the market. At present, white wet-pressed paper trays are commonly used. The surface of wet-pressed paper trays is more smooth and smooth, and the quality is significantly better than that of dry-pressed paper trays. So what is the forming process of the paper tray customized wet pressed paper tray products?
The forming process of wet pressed paper support products:
1. Vacuum suction molding method: It is a method of popularizing paper-plastic products. According to its different structure, there are three ways: drum type, flip type, and reciprocating lifting type.
Rotary drum type: continuous rotating production, high production efficiency, large investment in mold shells, high mold processing accuracy, high technical requirements for equipment processing accuracy, one set of concave molds with eight sets of convex molds. Requires CNC machining of molds, long processing cycle and large investment. Because it is continuous production, it is suitable for mass production of stereotyped products, such as trays, dinner trays, and egg trays. For industrial molding production, it is not applicable due to non-standard, small quantity, small batch, and large investment in molds.
Flip type: lower production efficiency than drum type, suitable for medium batch and non-standard production of industrial molding, but because it is a set of concave molds with two sets of punches, CNC machining molds are required, the mold shell investment is large, and the cycle time is long .
Reciprocating lift type: The production efficiency is the same as that of the flip type. It is a common production method at present. Because the equipment only needs a set of concave molds to match the punches, and does not need CNC processing, it is especially suitable for non-standard, small batch, and fast cycle industrial packaging products ( The mold production cycle of industrial packaging products is usually within 10 days)
2. Grouting method: According to different pulp packaging products, the injection molding method calculates the required amount of slurry (material) and quantitatively injects it into the molding cavity for adsorption molding. This kind of molding method adapts little to changes. The finalized standard products are commonly used in tableware molding products. Because the finalization calculation is difficult to grasp, this molding method is not used in non-standard paper-plastic packaging (industrial packaging).
