Blister packaging is a common packaging method, also known as vacuum blister packaging or thermoplastic blister packaging. It is a method of packaging by heating and softening plastic sheets and then adsorbing them on the product using negative pressure. It is also a commonly used method in PET packaging. Among them, a small hole is set in the blister mold, and this blister mold air hole plays an important role in blister molding.
The role of blister mold pores:
1.Play the role of exhaust. In the process of blister molding, after the thermoplastic plastic is heated and softened, it is adsorbed on the surface of the mold by negative pressure to form the product shape. However, since the plastic will produce gas during the heating process, if there is no suitable exhaust channel, the gas will not be discharged in time, which will cause the gas to accumulate inside the mold, thus affecting the product quality. The role of the blister mold pores is to provide a channel so that the gas inside the mold can be discharged smoothly to ensure the normal progress of the blister molding process.
2.Prevent vacuum effect. During the blister process, the negative pressure inside the mold absorbs the thermoplastic plastic on the mold surface to form the product shape. If there are no blister mold pores, the negative pressure formed inside the mold will form a vacuum effect, making it impossible for the plastic to be smoothly absorbed on the mold surface, resulting in an incomplete product shape or voids. By setting blister mold pores, the vacuum effect can be destroyed, ensuring that the plastic can be completely absorbed on the mold surface, ensuring the quality and integrity of the product.
3.Control the temperature during the blister process. During the blister process, the mold is heated to soften the plastic and adsorb it to the mold surface. However, if the mold surface temperature is too high, the plastic will soften or overheat prematurely, affecting the quality of the product. The blister mold pores can control the temperature during the blister process by dissipating the heat inside the mold and lowering the temperature of the mold surface, thereby ensuring the stability of product quality.
4.Prevent mold deformation. During the blister process, the mold will be affected by heating and cooling, and the temperature change will cause the mold to expand and contract, causing the mold to deform. The blister mold pores can reduce the heat accumulation inside the mold by exhausting air and controlling the temperature, thereby reducing the expansion and contraction of the mold, preventing the mold from deforming, and extending the service life of the mold.
5.Improve the efficiency of blister molding. By reasonably setting the blister mold pores, the gas inside the mold can be quickly discharged, the resistance and energy consumption in the blister molding process can be reduced, the blister molding efficiency can be improved, the production cycle can be shortened, and the production cost can be reduced. In a word, the blister mold pores play an important role in the blister molding process. It can exhaust, prevent vacuum effect, control temperature, prevent mold deformation, and improve the efficiency of blister molding. In the blister molding process, the reasonable setting and maintenance of the blister mold pores are crucial to ensure product quality and improve production efficiency. Therefore, in the design and use of blister molds, it is necessary to fully consider the role of the blister mold pores to ensure their normal operation in order to obtain better blister molding effects.
