What standards are used for the glass bottle inspection certificate?

 **Author:Orginal from Internet

hen examining a glass bottle, the first and most important factor is its clarity. A crystal-clear glass bottle creates a visually clean impression on customers, while its strength and quality enhance customer confidence. To improve the quality of glassware, many manufacturers use thermal and cold spraying techniques, heating the surface and interior of the glass bottles and infusing them with granular agents to enhance their strength. Another method involves applying a powder-infusion treatment to the surface and interior of the glass bottles to reduce the occurrence of cracks, thereby improving the bottles’ strength and overall product quality.

What standards are used for the glass bottle inspection certificate?

It is generally divided into five steps, which are listed below for reference and learning.

I. Deformation of the Glass Bottle Body

Since the bottle entering the forming mold has not yet fully set, excessively high temperatures of the molten glass droplet and the mold often cause the glass bottle to collapse and deform. The same can occur if the upper part of the bottle body is too heavy. Occasionally, if the bottom of the bottle has not cooled to a certain temperature, it may bear marks from the conveyor belt, causing the bottom to become uneven.

II. Feed Line Marks on the Bottle Body

Feed line marks are a common defect in glass bottles. They can be extremely fine; some are only visible under reflected light. They frequently occur at the mouth, neck, and shoulder of the bottle, though they are also common on the body and bottom—in these cases, they are caused by furnace temperature fluctuations.

III. Uneven Thickness in Glass Bottles

If the temperature of the glass droplet is uneven during processing, the higher-temperature areas have lower viscosity and are prone to being blown too thin, while the lower-temperature areas offer greater resistance and result in thicker sections. Additionally, uneven mold temperatures can cause the glass on the warmer side to cool more slowly, leading to thinner sections, while the glass on the cooler side cools more quickly, resulting in thicker sections.

IV. Cracks in Glass Bottles

Cracks come in various forms, ranging from creases to clusters of very fine wrinkles. The primary causes include the glass droplet being too cold, the droplet being too long, or the droplet failing to land in the center of the initial mold and instead adhering to the mold cavity wall.

V. Bubbles

Bubbles formed during the shaping process are often large bubbles or clusters of small bubbles; these differ from the small bubbles that are evenly distributed naturally within the glass itself.