Customized plastic bags under what circumstances need to proofing?

Believe we all know, in the process of plastic packaging bags of choose and buy, order early has become more and more people's favoured a choice. After all, custom-made plastic bags, must be more in line with the requirements of merchants. However, there are a lot of merchants in order, often require proofing first. Proofing, is refers to before the formal mass production, pull out a few first, make sure whether qualified, qualified for mass production. Then customized plastic bags under what circumstances need to proofing? Introduce below small make up for you: customized plastic bags in the following three cases, the need to proofing: 1, in don't know how to do, Specification) How thick the best requirement plastic bag factory proofing back fitting, so as to avoid mistakes. Or you can send plastic bag you want to packing product manufacturers. 2, not clear whether materials may be required to evaluate proofing at just the right time. After all, even of the same material in plastic bags of different manufacturer production out of the bag may also differ. Especially when you compare to the requirement of the high, such as transparency, hardness, etc. 3, requiring the printing effect, plastic bags can proofing first. About custom plastic packaging bags under what circumstances need to proofing this problem, small make up today is to introduce here. Of course, if you pack in custom-built plastic packaging, in addition to the above three conditions, there are some other special requirements, also can consult with factory proofing first.