Requirements for plastic hoses for plastic caps
The plastic cover is usually made of polypropylene (PP) by injection molding. The high-quality plastic cover should have no obvious shrinkage lines and drapes. The parting line should be smooth, the size should be accurate, and it should be smooth with the tube head, and it should not be brittle during normal use. Structural damage such as cracks, cracks, etc. For example, when the opening force is within the range, the flip cover should be able to withstand more than 300 folds without breaking.
Now some manufacturers, and this seller have no bottom line, only what you can't think of, what you can't do without it, no matter what the price is, the merchants are all for the purpose of making money. This is not something I bought on Taobao a few days ago. When I bought it, it looked good, but it was different when I received it. The thing turned out to be made of plastic hoses. I almost lost my temper. I contacted the merchant, It said that it is environmentally friendly, but things are not like this at all. I have never heard that this thing is made of plastic. He said that you can return it. I asked, the return shipping cost is 120 yuan, and I am speechless.
