Factors Affecting Transparency Of Polypropylene Thermoforming Products

1. Influence of homopolymer polypropylene raw materials

The raw materials used for Polypropylene Sheets and thermoforming products are usually homopolymer PP raw materials of low melting finger drawing grade, including commonly used T30S (t03h), l5e89, S1003, etc. However, the isotacticity control of drawing PP raw materials from different manufacturers is different, so the transparency and rigidity of raw materials are different, thus affecting the transparency of products. PP raw materials with low isotacticity are usually more transparent, but also softer.

2. Random copolymerization high transparent PP raw material

Random copolymerized high transparent PP raw materials contain certain ethylene copolymerization, so they have very high transparency and gloss. Some customers will mix homopolymer PP raw materials and high transparent PP raw materials in the formula to improve the transparency and gloss of the product and prepare high transparent cups. The ethylene content and the type and content of transparent agent of random copolymerized high transparent PP raw materials from different manufacturers are different, so the transparency and gloss of products mixed with different high transparent PP raw materials and homopolymer PP materials will also be affected.

3. Effect of toughening agent

In PP thermoforming and Blister products, more customers will add toughening agents to reduce the cup breaking rate or improve the low-temperature storage performance. At present, there are many kinds of toughening agents suitable for PP low-temperature toughening, but a considerable number of toughening agents will affect the transparency. Especially when the requirements for low temperature resistance are high and the amount of toughening agent added is relatively high, it is necessary to select a suitable toughening agent product to avoid negative impact on the transparency of the product.

4. Selection of transparent agent and transparent Masterbatch

There are a lot of polypropylene transparent agents in the market. There are differences in the effect and price of each kind of transparent agent, including the difficulty of dispersion and the appropriate amount of addition, as well as the difference in the antireflection effect. At the same time, since the sheet extruder is usually a single screw extruder, the shearing and dispersion ability is not strong, and the powder transparent agent may not be dispersed when used. Affecting the final transparency of the product. When preparing high transparent and high gloss thermoforming products, it is necessary to select appropriate transparent agent and transparent masterbatch.

5. Influence of leftover materials

Thermoforming and blister manufacturers usually mix a certain proportion of leftover materials. When customers produce highly transparent products, if there are some components in the leftover materials that affect the transparency, it will affect the quality and transparency of the sheet, and ultimately affect the transparency of the products. Therefore, customers need to control the production process and try to distinguish ordinary leftover materials from high-quality leftover materials.