We still use a lot of plastic products now, and they have many uses. However, because we don't know much about thermoforming products, sometimes we want to learn more about thermoforming. Below, we will share some knowledge about Large thick sheet thermoforming knowledge, and introduce its technical characteristics. If you are not familiar with it but are interested, you can take a look together.

　　Technical characteristics of large thick sheet thermoforming

　　The working principle of large thick sheet thermoforming is to pull the rolled sheet into an electric furnace oven and heat it to a softened state. Then, in the heated state, it is pulled over the thermoforming mold, the mold is moved up, and a vacuum is drawn to suck the soft sheet material onto the surface of the mold. At the same time, cooling water is sprayed in a mist-like manner onto the surface of the formed sheet to harden it. The formed sheet is automatically pulled to the material storage box, and a pneumatic cutter separates the formed sheet from the unformed sheet, thus completing the entire process. Most of the main quality problems of thermoformed products occur in this process:

　　1. Insufficient thermoforming, that is, the shape is deformed, and there is no product with the same shape as the mold;

　　2. Excessive bubbling indicates that the product is too thin;

　　3. Pulling lines refers to the appearance of unnecessary line marks on the formed product;

　　4. Uneven thickness. These problems need to be adjusted after the mold is installed, including: the time the sheet material advances, the heating temperature and time, the vacuum strength and time, the position, time, and depth of the upper mold falling, and the placement position of the mold in the plate making position, whether accessories are added between the molds, etc.

　　The thickness of large thick sheet thermoforming is generally 0.14～8.0mm, and the products have different materials and effects. Mainly used in refrigerator inner liners, advertising light boxes, product display racks, pet cage bottom plates, rear projection TV shells, and various mechanical panels. They can replace injection-molded products. Features: low mold cost (only 1/20 of injection molds), short production cycle, short mold development time (generally only 3-5 days), etc.

　　The reason for classifying material types is mainly because ordinary thin sheet thermoforming and Large thick sheet thermoforming the materials used have some differences, but PVC, PP, PS, and PET account for the majority of these two types of thermoformed products. One place, known as the plastic product material family!

　　PVC hard sheet has moderate toughness and is not easy to burn. When burned, it will produce, which has a certain impact on the environment. It is easy to heat seal and can be sealed with a sealing machine and a high-frequency machine. It is the main raw material for producing transparent plastic products.

　　PS hard sheet has low density, poor toughness, and is easy to burn. When burned, it produces styrene gas (harmful gas), so it is generally used to produce various industrial thermoformed trays.

　　PET hard sheet has good toughness, high transparency, and is easy to burn. When burned, it does not produce harmful gases. It is an environmentally friendly material, but the price is higher, suitable for plastic products. Thermoforming blisters in European and American countries generally require PET hard sheets, but they are not easy to heat seal, which brings great difficulties to packaging. In order to solve this problem, people composite a layer of PVC film on the surface of PET, called PETG hard film, but the unit price is higher.