Each thermoplastic material of the medical blister packaging box will exert great drafting at a certain temperature, and only a minimum force is required for drafting at the most suitable molding temperature. Assuming that the vacuum blister molding machine cannot provide the necessary force, the formed sheet needs to be further heated so that the product can achieve the required standard accuracy, that is, the sheet cannot be molded under the optimal stretching plan. . Assuming that the accuracy requirements in the actual processing process are too high, and the high draft rate is required, the formed sheet requires a higher temperature. For example, the radius of the edge part of the refrigerator liner formed by the male mold is required to be less than 6 mm, or the diameter of the pressure forming bottom of the female mold is less than 1.5 mm.
The higher the requirements of medical blister packaging, the further away from the violation of optimal drafting, which will lead to uneven wall thickness distribution of the product and thin spots on the side walls. There are sharp protruding parts after molding, and the material used will be very unstable during vacuum forming. Process support is very important, but often not enough attention is paid to its role. Assuming that the grid is divided on the unmolded material, the drafting effect can be evaluated after vacuum forming.
The clarity of details is affected by the following factors: the type of plastic material, the thickness of the sheet, the molding temperature, the molding force, the temperature of the molding die and the vent hole.