How to Distinguish among PE Bag, PP Bag And PO Bag?
Do you know the difference among PE bag, PP bag and Po bag?
The difference between PE plastic bag, PP plastic bag and Po Plastic Bag: PE and PP are English abbreviations for raw materials. The chemical name of PE is linear polyethylene, which can be divided into two kinds. One is high-density linear polyethylene, which we usually call Po HDPE, and the other is low-density linear polyethylene, which we usually call PE LDPE. In fact, this low-density linear polyethylene is also divided into two types, LDPE and LLDPE (we will call them main material and auxiliary material respectively, but when making rubber bags, they need to be used together). The chemical name of PP is polypropylene. There is no more detailed distinction. When signing the contract, there are three kinds of raw materials: LDPE / LLDPE / PP. The finished products are PE bags (PO bags have no export name) and PP bags.
1. The raw materials of bubble bags and bone bags are PE materials, that is, the synthetic materials of LDPE and LLDPE. The plastic bags used in general factories are also PE plastic bags, such as electronics factory, electrical appliance factory, hardware factory, plastic factory, clothing factory, shoe factory, etc. PE bags are widely used. The film used by farmers in spring ploughing is also PE material. PE plastic bags look transparent, feel smooth, soft sound is not loud and toughness is good (this is LLDPE at work).
2. PP plastic bags are mostly used for gift packaging and sales of finished clothes. The new clothes we buy are usually Po Plastic bags, which are packed with plastic bags and have a layer of double-sided rubber seals. PP plastic bag is very transparent and smooth to touch, but it is very hard, loud and brittle. If you fold it in half, there will be a crease. If you fold PE plastic bag, there will be no crease. Because of the good transparency, it looks high-grade when packaging gifts. PP plastic bags are very similar to Po Plastic bags, but the transparency is not as good as po, so the price of PP plastic bags is more advantageous than Po Plastic bags.
PP material used to be more expensive than PE material. In recent two years, due to the rise of oil price, our plastic bag cost has also increased a lot. But I don't know what the reason is, PE material is tighter than PP material, and the price also exceeds the price of PP material.
As for the Po plastic bag, it can also be very thin. According to our current technology, one silk can be produced, while the thinnest PE and PP can only be two silk, and even PP can't, so the PO price advantage is more obvious. However, Po plastic bag is almost white, and its use is relatively small.