This is a common problem encountered by many cosmetics brands and buyers. Many people think that paint peeling is due to cutting corners by spray painting factories, but in fact, more than 80% of glass bottle paint peeling problems are caused by surface treatment and process control before spraying, rather than the paint itself. There are several reasons for this:   1.The glass surface is not thoroughly cleaned During the production and spraying process of glass bottles, there may be residues such as dust, grease, fingerprints, and mold release agents. These pollutants will form an isolation layer. When spraying, the paint actually adheres to the oil stains, not to the glass. When subjected to friction or temperature changes, the entire paint film will peel off together. The solution is to perform ultrasonic cleaning, alcohol cleaning, acetone degreasing, and ion air dust removal before spraying; Ensure that the cleanliness of the glass surface meets the spraying requirements. &nb...

  Many buyers and brands notice something during inspections: the same glass bottle can have one side of the wall thick and the other side thin. It’s sometimes hard to see with the naked eye, but shining a light through it or weighing it makes it obvious. Uneven wall thickness isn’t just about looks—it directly affects filling safety, shipping breakage rates, and the feel of the final product.   First, the risk of breakage goes up. If parts of the bottle are too thin, weak spots can appear. During filling under pressure, temperature changes, long sea trips with bumps, and stacking, these spots are prone to cracking. Even if nothing shows up during factory checks, damage in a customer's warehouse or at the market can still cause loss of materials and hurt the brand's image. Second, it can cause visible color differences after filling. When you pour in transparent serums, toners, or other clear liquids, the light passing through the bottle can make the thickne...

1、Design evaluation The first step in customization is bottle design, but this is not only about polishing the appearance, but also a technical evaluation of the feasibility of the mold. Many brands directly look for factories with renderings, but ignore that packaging must first serve the formula. You need to first determine the product type: essence dropper bottle, face cream jar, toner spray bottle or oil split bottle, and determine the capacity, acid-base property and photosensitivity of the formula. Excellent design must consider the demolding angle to ensure that the bottle body has sufficient slope for smooth demolding; At the same time, it is necessary to ensure uniform wall thickness to avoid deformation or breakage of the glass due to stress concentration during cooling shrinkage. In addition, the position of the parting line needs to be cleverly hidden (such as at the edges), and surface treatment (smooth, frosted, or textured) also needs to be planned in advance, as this di...