In the high-end skincare industry, airless pump bottles are no longer an unfamiliar concept. With their superior antioxidant protection capabilities, they have become an indispensable guardian of precious formulas. By isolating the skin from air, airless bottles ensure that every drop of ingredient reaches the skin in its purest and most effective state, preventing oxidation, deterioration, and contamination at the source. This is a key reason why they have become a core choice for high-end skincare packaging.

  However, there is a common misconception about airless bottles: the public assumes that the "air-push preservation principle" of airless bottles relies on a movable structure at the bottom, limiting the material to plastic, as glass cannot achieve a airless effect. In fact, double-walled glass airless bottles have long since broken this limitation, achieving a perfect fusion of luxurious feel and vacuum preservation through a sophisticated "bottle within a bottle" design.

  The core secret of the double-walled glass airless bottle lies in the synergistic effect of its three layers: First, there's the independently sealed inner glass liner, which directly holds the skincare product, with a completely sealed, seamless bottom to prevent air from seeping in. The outer layer is a sturdy, thickened glass layer that, through precision manufacturing, creates a stable negative pressure space between the inner and outer layers. When the pump head is pressed, the air pressure pushes the inner liner vertically downwards, precisely releasing the product. After releasing, the negative pressure automatically pushes the inner liner back to its original position, completing one "air pressure cycle." Throughout this process, air serves only as a driving medium, remaining completely isolated from the inner liner, achieving a more advanced preservation effect than traditional plastic airless bottles.

When faced with choices, how should we think?

• If you prioritize portability and practicality, traditional plastic airless bottles remain a reliable old friend.

• If you're aiming for the ultimate luxury experience, its substantial weight, cool touch, and absolute ingredient compatibility silently convey a luxurious brand image.

  For high-end skincare brands, airless bottles are never just containers; they are a concrete expression of the brand's philosophy. The choice between glass and plastic airless bottles essentially reflects a precise understanding of brand image and consumer experience. Choosing the right "first point of contact" often allows a product to stand out from the competition and gain long-term consumer trust.

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 hydrophilic groups, OH (hydroxyl), float on the glass surface, making it difficult for ink to adhere. Alkali ions on the glass surface form Na-O bonds. These bonds are easily broken by air and water, making it difficult for ink to adhere.

2.Four surface treatment processes for skin care glass bottles

Fat sensitive treatment

Various siloxane coupling agents are coated on the glass surface to form lipid-sensitive groups, thereby increasing the affinity of the glass to ink.

Fat removal treatment

Before any treatment, ensuring the glass surface is absolutely clean is the first step. Grease and dust contaminated during production and transportation are the biggest enemies of ink. We usually use organic solvents such as acetone and methyl ethyl ketone for precision cleaning, or use efficient vapor degreasing process to completely remove all contaminants.

Strong acid treatment

In order to solve the problem of easy migration of alkali ions on the glass surface.By using strong acid solutions such as hydrofluoric acid and sulfuric acid to corrode the surface of the glass bottles of skin care products, the weak boundary layer and free alkali ions on the surface can be effectively removed, forming a microscopically rougher and more stable surface structure, thereby fundamentally improving the mechanical interlocking force and chemical bonding force of the ink.

Physical polishing

Light sandblasting with very fine abrasives or hydro-sanding with hydro-sandpaper can create countless tiny bumps and depressions on the glass surface at a microscopic level.Light sandblasting with fine powder abrasive or hydro-grinding with water-abrasive paper can remove surface attachments and improve ink affinity.