Firstly, material selection and pre-treatment
1 Glass material
Borosilicate glass: mainly made of Type I transparent or brown borosilicate glass, with high heat resistance, chemical inertness, and UV resistance, suitable for storing photosensitive active ingredients (such as vitamin C and plant extracts)
Soda glass: Some low demand products may use type III soda glass, which has lower cost but poorer heat resistance
Dark glass: Brown or black glass bottles are used to protect photosensitive components and prevent component decomposition by blocking ultraviolet rays
2 Accessory materials
Dropper head and rubber ball: medical grade silica gel or rubber is usually used, which needs to pass the dissolution test to ensure compatibility with essence liquid
Bottle cap and seal: made of aluminum or plastic material, some high-end products use anodizing process to enhance aesthetics
- Dropper glass bottle capacity
Oil glass dropper bottle capacity like 10ml 20ml 30ml 50ml 100ml oil dropper bottle
Second, core production process flow
1 Glass tube forming
Step 1 Cutting and shaping: Cut the glass tube to a preset length, and form the bottle body by blowing (complex shape) or pressing (simple shape), with a temperature controlled between 600-800 ℃
Stap2 annealing treatment: After forming, the glass bottle is slowly cooled in an annealing furnace (about 500 ℃ to room temperature) to eliminate internal stress and enhance mechanical strength
2 Surface treatment
Step 1 Polishing and Coating: The bottle body is mechanically polished or chemically etched to achieve a smooth surface, and some products are sprayed with scratch resistant coatings or coatings to enhance glossiness
Step 2 Printing and Decoration: Use screen printing, hot stamping, or laser engraving techniques to add brand logos, and some bottle bodies can be customized with Pantone color codes or gradient effects
3 Assembly of dropper components
Step 1 Dropper head processing: Glass pipettes are flame polished to form precise aperture (such as F-shaped tips), controlling droplet size (40-55 µ l)
Step 2 Automated assembly: In the clean workshop, rubber balls, dropper covers, and glass tubes are combined using an automated assembly machine to ensure sealing.
Step 3 Inert gas filling: some high-end products are filled with nitrogen or argon before packaging to reduce oxidation of essence
- Quality inspection
Step 1 Sealing Test: Negative pressure method is used to test the sealing of the bottle mouth to prevent liquid leakage
Step 2 Dimensional accuracy: Measure the diameter, height, and dropper aperture of the bottle, with a tolerance controlled within ± 0.1mm.
Step 3 Chemical resistance test: Simulate the immersion of essence liquid components (such as ethanol and grease) to evaluate the corrosion resistance of glass.
Third, special craftsmanship and customized design
- Aseptic treatment uses ethylene oxide sterilization or gamma ray irradiation to ensure that dropper bottles meet pharmaceutical grade hygiene standards.
- Environmentally friendly processes use recyclable glass raw materials to reduce production waste; Some brands adopt lightweight design to reduce transportation carbon emissions.
