Both high pressure and low pressure bags are made of PE polyethylene. Low pressure plastic bags are made of high density polyethylene, the main characteristics are hard texture, feel very good, opaque, not easy to break. High stability, good dimensional stability, heat resistance and mechanical strength, high water vapor barrier, poor transparency.
High pressure plastic bags are made of low density polyethylene, the main characteristics of soft quality, good transparency, feel sticky, easy to wear, low strength. With low crystallinity and softening point, softness and elongation is better, impact resistance.
What’s the difference between a high pressure bag and a low pressure bag
1. Material, high pressure bag LDPE, also known as low density polyethylene; Low pressure bag HDPE, also known as high density polyethylene.
2. The characteristics of high pressure plastic bags are better than those of low pressure plastic bags. However, due to the softness, the thickness of high pressure plastic bags is much larger than that of low pressure plastic bags, so it needs more materials than low pressure plastic bags. Therefore, the price of high pressure plastic bags will be higher.
3. When stretching plastic bags by hand, the phenomenon of white marks is low pressure material, while high pressure material has no white marks.
4. In terms of appearance, the appearance of the high-pressure bag looks like a certain glossiness, soft and smooth, with soft sound, small sound, large extension and good toughness. High pressure bag transparency is higher, many high-grade portable plastic bag raw materials, industrial products outer packaging, such as packing box lining bag, supermarket selling plastic wrap are made of high pressure material.
Low pressure bag looks no gloss, feel rough, knead up loud, pull very good, hardness is higher than low pressure bag, widely used in supermarket shopping bags, shopping bags in the wet market.
High pressure bag is often used for food, daily use, vegetables, shrinkage, self-adhesive light packaging film and agricultural plastic film, shed film, cling film, etc.
Low pressure film because of its high film strength, mainly used for heavy packaging film, tear film and vest bag.
Post time: Mar-16-2023