Blister sheets commonly used in products in daily life

Editor:海宁弘凯科技有限公司 │ Release Time:2022-05-26 

At present, the commonly used sheets for blister products in life are: PVC, PET, PP, PS and flocking sheets, gold-plated sheets and anti-static sheets based on this.

PVC: the most commonly used plastic material, soft, strong toughness, good plasticity, can be made into transparent and various colors, commonly used transparent PVC packaging electronics, cosmetics, toys and gifts and other products.

PET (A-PET): Hard, tough, high strength, bright surface, environmentally friendly, non-toxic, transparent and multi-colored sheets. The disadvantage is that PET high-frequency heat sealing is more difficult, and the price is much more expensive than PVC. This material is often replaced by PVC by users who require high-end products and environmental protection. PS: low density (light weight), environmentally friendly, non-toxic, very good plasticity, poor toughness and brittle, It cannot be made into a transparent material, so it can only be made into a bottom-type blister. Because it is easy to crack, this kind of blister is not suitable for recycling PP: the material is particularly soft, good toughness, environmentally friendly, non-toxic, high temperature resistant, and is often used as a dining utensil Or the packaging of other high temperature resistant products; but its plasticity is poor, the processing is difficult, the surface gloss is poor, and the color will become lighter during processing.

PET-G: The physical properties are similar to A-PET, but it can be heat-sealed with high frequency, and its price is 80% more expensive than A-PET

If classified according to the thickness and degree of the material:

1. The thickness of ordinary thin blister is 0.14~5.0mm----mainly using various materials and effects such as PVC, PP, PS (HIPS), PET (including APET and PETG), PE, BOPS and recyclable paper trays It is widely used in food, medicine, electronics, toys, computers, daily necessities, cosmetics and mechanical hardware and other industries.

2. The thickness of special thick blister is 0.14~8.0mm----mainly made of PVC, PP, PS (HIPS), PET (including APET and PETG), ABS, PC, PE and PMMA and other materials and effects Injection molding type blister products, the main products are refrigerator liner, advertising light box, commodity display rack, pet cage chassis, rear projection TV back shell and various mechanical panels, etc., can replace injection molding products, with low mold cost (only injection mold 1/20), short production cycle, short mold development time (generally only 3~5 days) and other characteristics There are some differences in materials, but PVC, PP, PS and PET have a place in these two types of blister products, which can be called the "four kings" of the blister product material family!

PVC hard sheet has moderate toughness and is not easy to burn. When burning, chlorine gas will be generated, which will have a certain impact on the environment. PVC is easy to heat and seal, and can be sealed with a sealing machine and a high-frequency machine. It is the main raw material for the production of transparent plastic products.

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

PET hard sheet has good toughness, high transparency, easy to burn, and does not produce harmful gas when burning. It is an environmentally friendly material, but the price is high, and it is suitable for high-end blister products. Plastic blister shells in Europe and the United States generally require PET hard sheets. However, it is not easy to heat seal, which brings great difficulties to packaging. In order to solve this problem, people compound a layer of PVC film on the surface of PET, which is named as PETG hard sheet, but the price is higher. Some rigid PVC is the most widely used plastic. one of the materials. PVC material is an amorphous material. In practical use, PVC materials often add stabilizers, lubricants, auxiliary processing agents, colorants, and impact-resistant agents to absorb other additives.

PVC material has non-flammability, high strength, weather resistance and excellent geometric stability.

PVC is very resistant to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.

The melting temperature of PVC is a very important process parameter during processing. If this parameter is not appropriate, it will lead to the problem of material decomposition. The flow characteristics of PVC are rather poor and its process range is very narrow. In particular, high molecular weight PVC materials are more difficult to process (such materials are usually added with lubricants to improve flow characteristics), so small molecular weight PVC materials are usually used. The shrinkage rate of PVC is quite low, generally 0.2~0.6%