How to Distinguish between PE Bag, PP Bag And PO Bag?
Do you know the difference between 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 is divided into two types. One is high-density linear polyethylene, which we usually call PO --- HDPE, and the other is low-density linear polyethylene, which is what we usually call PE --- LDPE. There are also two types, LDPE and LLDPE (we will call them the main material and the auxiliary material respectively, but when making plastic bags, the two must be used together). The chemical name of PP is polypropylene, and there is no more detailed distinction. There are three types of raw materials: LDPE / LLDPE / PP. The finished products are PE plastic bags (PO plastic bags have no export name) and PP plastic bags.
1. The raw materials of bubble mailers and bone bags are PE materials, that is, synthetic materials of LDPE and LLDPE. The plastic bags used in general factories are also PE plastic bags, such as electronics factories, electrical appliances factories, hardware factories, plastic factories, clothing factories, shoe factories and so on. The application of PE plastic bags is very wide. The film used by farmers during spring ploughing is also made of PE. The PE plastic bag looks transparent, is smooth to the touch, has a small soft sound and good toughness (this is because LLDPE is at work).
2. PP plastic bags are mostly used for gift packaging and sales of finished clothing. The new clothes we buy are packed in plastic bags, and there is a layer of double-sided plastic seals that are usually PO plastic bags. The PP plastic bag is very transparent and slippery to the touch, but it is stiff, loud and crisp. If you fold it in half, there will be creases, but there is no fold in PE plastic bags. Because of its good transparency, it looks very high grade when packing gifts. PP plastic bag is very similar to PO plastic bag, but the transparency is not as good as PO, so PP plastic bag has a price advantage over PO plastic bag.
In the past, PP materials were more expensive than PE materials. In the past two years, due to the rise in oil prices, our plastic bag costs have also risen a lot. But I don't know what the reason is, PE material is more tightly sold than PP material, and the price also surpasses the price of PP material.
3. As for the PO plastic bag, it also has its particularity. It can be made very thin. According to our current mastery technology, 1 wire can be produced, while the thinnest PE and PP can only be 2 wires, and even PP can not be 2 wires. In this way, the price advantage of PO is even more obvious. However, the PO plastic bag is almost white, and its use is relatively small.