Many brand customers may not realize that the mirror-like glass surface actually hides the challenge of ink adhesion.To solve the above problems and ensure that the brand logo and exquisite patterns can be presented on the skin care glass bottles in a durable and vivid manner, we must pre-treat the glass surface. The following are several methods commonly used in the industry: 1.Why is it difficult for ink to adhere to glass bottles of skin care products? Glass is primarily composed of silicon dioxide (SiO₂), which has a unique structure: silicon atoms (Si) are primarily located within the glass, while oxygen atoms (O) are more exposed on the surface. This structure results in an extremely high surface energy, making the glass highly reactive and easily interacting with surrounding materials. This structure has a high surface energy and is easily interacted with other substances. For example, when exposed to air, it combines with hydrogen in the air to form hydrophilic groups. These hy...

When choosing skincare product packaging, the key differences between UV-protective glass bottles and ordinary glass bottles are mainly reflected in the following aspects: In terms of protection, UV-protective glass bottles can block more than 99.5% of ultraviolet rays (380-500nm band), effectively protecting photosensitive ingredients such as vitamin C and retinol from photo-oxidation; while ordinary glass bottles have almost no professional ultraviolet protection capabilities (blocking rate <50%). In terms of product lifespan and cost, UV-resistant glass bottles can extend product shelf life by 40%-60%, but due to the addition of special oxides, the material cost is 15%-25% higher than that of ordinary glass bottles. In terms of sustainability, both types of glass bottles are 100% recyclable, but the UV-resistant glass bottle can be combined with PCR recycled materials, making it more environmentally friendly. 1.UV Blocking Mechanism:  UV-protective glass bottles form a stabl...

If you are sourcing packaging for your skincare or cosmetic brand, understanding why ink struggles to adhere to glass will help you vet suppliers and avoid costly quality issues. Here are the three primary reasons why print fails on a glass cosmetic bottle.   1. Characteristics of glass bottles themselves The main component of glass is silicon dioxide (SiO ₂), which has a very smooth surface and no pores, unlike paper, plastic, or wood that allow ink to penetrate and form mechanical bonds. At the same time, when the glass surface is exposed to air for a long time, it will adsorb moisture from the air and form a hydroxyl (OH) hydrophilic layer. This invisible water film will reduce the bonding force between the ink and the glass, making it difficult for the ink to adhere firmly. The glass surface is highly inert. Ordinary soda lime glass has a smooth surface and low molecular polarity, making it difficult for ink to generate chemical bonding forces. With only physical adsorption, i...

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...