Generally, our large thick sheet thermoforming production technology begins with mold making and processing. First, thermoforming molds are made according to customer requirements and sample specifications. Under normal conditions, a plaster model is first made as a sample. After the customer confirms the sample and technology, wood plastic, copper molds, and aluminum molds can be used as molds. So, let's learn about the process flow and uses of thick sheet thermoforming!

　　Large thick sheet thermoforming generally has a thickness of 0.14~8.0 mm - mainly ABS blister, PC blister, PVC, PP, PS (hips), PET (including APET and PETG), etc.

　　Classified by material type, the main consideration is that there are some differences in the materials used for ordinary thin absorbers and special thick absorbers, and PVC, PP, PS, and PET occupy a place in these two types of absorbers, which can be said to be the absorber material family.

　　PVC hard seat has moderate toughness, is not easy to burn, and produces some environmental impact when burned. PVC is easy to heat seal, and the edges can be blocked by a sealing machine and high-frequency machinery, which is the main raw material for producing transparent blister products.

　　Because PS hard sheet has low density, poor toughness, and is flammable, and produces styrene gas (harmful gas) when burned, it is generally used for the manufacture of various industrial thermoformed trays.

　　PET hard sheet is a tough, highly transparent, flammable, environmentally friendly material that does not produce harmful gases when burned, but it is expensive and suitable for making high-grade blister products. Thermoforming in European and American countries generally requires the use of PET hard sheets, but it is not easy to heat seal, which brings great difficulties to packaging. In order to solve this problem, a PVC film is laminated on the surface of PET, named PETG hard sheet, but the price is higher.

　　Taking large thick sheet thermoforming with plaster molds as an example, after the plaster mold used for large blister molding is made, it is first naturally dried completely, or after drying, according to the concave-convex situation of the product surface, many small holes are drilled in the low-lying areas that do not affect the product packaging pattern with a 1-2 mm drill bit.

　　If it is a product such as a packaging box, when using suction molding for production, in order to exhaust air, a small hole needs to be opened around it. After drilling holes in the mold, the plaster mold must be hardened. The hardening method is to soak it in alum saturated solution and let it dry.

　　Large thick sheet thermoforming After the mold is completely dried, place the mold on the upper iron plate of the vacuum chamber; then, according to the size of the mold, place the plastic sheet on the applicable standard size; place the sheet in the heating wooden box and fix it completely, and put the wooden box together with the plastic sheet into the constant temperature oven for softening treatment. For thick sheet thermoforming, the softened plastic sheet and the wooden shell must be placed in the vacuum chamber, the suction switch is turned on, and the air in the vacuum shell is sucked clean; after the plastic sheet is cooled, a concave packaging and process mold that is the same as the mold can be obtained.

　　The above is the process flow and uses of thick sheet thermoforming. If you need to know more, please feel free to contact us!