Airless bottles are a major category of packaging materials in cosmetics. Airless bottles commonly used in the market are composed of a cylindrical and ellipsoidal container and a piston at the bottom. Its design principle is to use the contraction force of the spring and prevent air from entering the bottle, creating a vacuum state, and use atmospheric pressure to push the piston at the bottom of the bottle forward. However, because the spring force and atmospheric pressure cannot give sufficient force, the piston cannot fit too tightly with the bottle wall, otherwise the piston will not be able to rise and advance due to excessive resistance; on the other hand, if the piston is to be easily advanced and prone to material leakage, Therefore, the vacuum bottle has very high professional requirements on the manufacturer.

Appearance quality requirements

1. Appearance: Airless bottle and lotion bottle caps should be complete and smooth, without cracks, burrs, deformation, oil stains, shrinkage, clear and full threads; Airless bottle and lotion bottle bodies should be complete, stable, smooth, with smooth and smooth mouth , Full thread, no burrs, holes, no obvious scars, stains, deformation, no obvious misalignment of the mold line. Transparent bottles should be clear and clear.

2, cleanliness: clean inside and outside, no free pollution, no ink stain pollution.

3. Outer packaging: The packaging carton must not be dirty or damaged. The inside of the box should be lined with plastic protective bags, and the easy-to-scratch bottles and caps should be packed to avoid scratching. Each box is packed in a fixed quantity and sealed in an "I" shape with tape. Do not mix them. Each shipment is accompanied by a factory inspection report, and the contents of the outer box, such as the name, specifications, quantity, production date, and manufacturer, must be clearly legible.

Surface treatment and graphic printing requirements

1. Color difference: uniform color and luster, conforming to the specified color or within the range of swatch sealing.

2. Surface adhesion: The appearance of the vacuum bottle and emulsion bottle is spray-painted, electroplated, stamped, and printed. Use 3M810 test tape to cover the printing and stamping (silver) parts, smooth them, and keep the cover parts free of bubbles. 45 °, then quickly peel off, peeling area is less than 15%

3. Printing and bronzing (silver): The font and pattern should be correct, clear and uniform, without obvious skew, dislocation, and defect; the bronzing (silver) should be complete without leakage, misalignment, and no obvious overlapping or jagged.

4. Wipe the gauze soaked with disinfectant alcohol back and forth twice in the printing area, without any discoloration of printing and gilding (silver) falling off.

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