Three methods to judge the quality of plastic injection molding

How to judge the quality of plastic workpiece? I believe this is a concern of many customers. Although there are many enterprises engaged in the injection molding industry, the technical strength and equipment level are still different, so the processed products are also different.
1. Vision: transparent and colorless commodities look very transparent and the quality of the products without impurities is better (mostly produced with original granule materials), such as bags, cups, lunch boxes and preservation boxes; Opaque or look a lot of impurities for the quality of goods a little worse (mostly raw powder production) such as packing boxes, POTS, hangers, stools goods. Opaque goods are more poor goods (more for the back material production, but the back material will be divided into many kinds such as manufacturer trimming produced back material; Dealers return the defective goods to the manufacturer) such as garbage cans, garbage bins and bags.
2, smell: smell up the taste is very light, but there is a touch of plastic taste for better quality goods; The smell of plastic is very strong for the quality of a little less goods; The smell of plastic is very strong and there is a pungent smell mostly of poor quality goods.
3, touch: touch the edge of the goods, no pain feeling, the edge is clean for better mold, flying repair is also better; Feel very prickly hand, the edge is very rough for the mold is very poor.