The third most common synthetic plastic, polyvinyl, is also known under the names poly(vinyl chlorineide) or PVC. It is a cost-effective and versatile thermoplastic with good impact and dimensional stability. It can easily be extruded, calendered, die-cut, as well as printed using offset or conventional screen printing. It can be made clear, matt, colored, or white and flexible or rigid depending on its composition. It can also easily be reprocessed with heat.
PVC is characterized by a strong intermolecular interaction and a polar backbone. It is therefore very rigid at roomtemperature. However, it can easily be softened (plasticized), by mixing with plasticizer during fabrication. Vinyl polymers are versatile, and this is a significant advantage.
PVC film made without plasticizer is known as rigid vinyl film. Flexible vinyl film is made with plasticizer.
Vinyl Film Flexible
Flexible vinyl film not only has excellent oil and grease resistance but it is also oxygen permeable. It also features excellent clarity, puncture resistance, and good cling. These properties make flexible PVC suitable to be used in food packaging to preserve meats and other perishable items (when FDA approval is granted). However, plasticized PVC does not have a melting point and is less resistant than rigid vinyl. It also has a lower ultimate strength and tensile force.
Vinyl Film Rigid
Rigid Vinyl, also known by unplasticized polyvinylchloride (uPVC), a strong and lightweight material. It is one the most durable and cost-effective films available. It also resists many chemicals. uPVC can typically be used up to 60°C. Flexible PVC does not have the same tensile strength or modulus as uPVC. It also has lower impact toughness. Stress cracking can occur depending on the environment.
PVC can have some limitations and drawbacks. PVC can change its properties and make it less strong in certain conditions. PVC also produces small amounts of hydrogen chlorineide when heated and carbon deposit on the sealing equipment. PVC shrinkwrap should be sealed under good ventilation.
PVC films are used to shrink wrap and stretch consumer and industrial goods. They also serve as pallet wrap but on a smaller scale that polyolefin film. Other uses include bag liners, bottle sleeves, adhesive tape backing and labels. bags. It is often PVDC-coated when it is required to have improved moisture barrier properties.
PVC that has been approved by FDA for fresh red meat packaging is a good choice. It is semi-permeable. That is, it only allows enough oxygen through to maintain the product's bright red color. PVC is frequently used for transparency.Tags: PVC film