PVC heat seal shrink wrap or flat bags are good for small volume gift or retail packaging, good ventilation may be needed when apply too much heat. Low shrink temperature, easy to shrink are both advantage and disadvantage for PVC shrink film and bags. Especially for manual operation, you do not need to apply too much heat to shrink them, at the same time, this also presents a storage challenge. The storage needs to avoid direct shinning sunlight or hot places, since it may pre shrink before use. Polyolefin (POF) shrink film is soft and stretchy, and does not have smell when is heated. It is made of polyethylene and polypropylene, which are all FDA approved materials for food packaging. Central fold shrink film and heat seal equipment, L bar sealer, are often used to shrink wrap retail products. PVC dome bags are used for gift basket packaging. The difference between shrink tubing film and central fold shrink film is that the tubing film is like a hose, with two sides closed, but central fold shrink film has one side open. Get in touch with us for wholesale shrink wrap supplies.