The forming method of bubble cap machine

The forming method of bubble cap machine

Molding is an important process in the whole packaging process. The bubble cap molding method can be divided into the following four kinds.

①Blister molding (negative pressure molding). The film, which is heated and softened, is sucked into the socket of the foaming pancreas to form a certain geometric shape, so as to complete the foaming. Blister forming generally adopts roller mold, forming bubble cap size is small, the shape is simple, the bubble cap stretching is not uniform, the top is thin.

② blow molding (positive pressure molding). The film softened by heating is blown into the socket of the bubble cap of the forming mold by compressed air to form the bubble cap with the required geometric shape. The wall thickness of the formed bubble hood is relatively uniform, and the shape is quite wide, and the bubble hood of large size can be formed. Blow molding is mostly used for plate mold.

③ the punching head auxiliary blow molding. With the help of the punch will be forced to heat the softened film pressed into the cavity, when the punch is completely pressed into, through the compressed air, so that the film close to the wall of the cavity, complete the molding process. The punch size is about 60% ~ 90% of the molding cavity. The bubble caps with uniform wall thickness, wide edges and corners, large size and complex shape can be obtained by reasonably designing the shape and size of the punch, the pushing speed and the pushing distance of the punch. Punch auxiliary molding is widely used in flat plate blister packing machine.

④ Convex and concave die cold stamping forming. When the packaging material is rigid, the hot forming method is obviously not applicable, but the convex and concave die cold stamping forming method, that is, the convex and concave die closed, the diaphragm forming process, in which the air is discharged from the vent hole in the forming die.