Plastic injection machines are fully suitable for manufacturing various types of bottle caps (such as beverage bottle caps, medicine bottle caps, etc.), which is the most common production method in the packaging industry. Here are the key points:

1. Process adaptability
Rapid thin-walled molding: Bottle caps typically have extremely thin wall thicknesses (about 0.2-0.5mm), and the high-pressure injection capability of injection molding machines ensures that the melt quickly fills the mold, avoiding material shortages caused by premature cooling.
Material diversity: It can adapt to food grade plastics such as PP (polypropylene) and PE (polyethylene), and maintain material fluidity by adjusting the melting temperature (such as PP requiring 170-220 ℃), while meeting food safety standards.

2. Core production process
Efficient mold design: adopt a the first mock examination multi cavity structure (48 – 144 bottle caps can be produced from a single mold), integrate a thread forming mechanism (rotating demoulding or sliding block core pulling) in the mold, and directly inject the tightening tooth lines.
Fully automatic cycle: The robotic arm automatically picks up the lid, synchronously completes the assembly of the sprue and inner gasket (such as beer bottle cap sealing gasket), and some production lines embed printing units for real-time coding.
Cooling and shaping control: precise zoning cooling of the mold water circuit to avoid shrinkage and deformation of the bottle cap top, ensuring a tight fit with the bottle mouth.

3. Implementation of special functions
Anti counterfeiting structure: A broken anti-theft ring (such as a mineral water bottle cap) is injected through a mold groove, and the ring teeth break and leave residual bottle mouth when the cap is opened.
Sealing performance: Elastic gaskets (such as silicone) are pressed in the mold, or airtight micro ribs are formed during injection molding (such as drug bottle caps), without the need for secondary processing.

4. Quality and efficiency advantages
High speed mass production: A single machine can produce millions of bottles per day (taking cola bottle caps as an example, more than 50000 bottles per hour), and the waste can be directly mixed with raw materials after crushing (proportion ≤ 20%).
Zero defect control: Visual system detects the integrity of tooth patterns and anti-theft ring connection points; The pressure tester randomly checks the sealing performance and automatically sorts and removes the leaking cover.