Most adhesive injection machines (e.g., Graco models) support water- and solvent-based adhesives. Designed for lids with diameters of 50–127 mm, they achieve speeds of 100–500 lids per minute (single channel). Operation involves reciprocating motion with single/dual-channel injection, transferring lids from stacking devices to rotating clamps for precise adhesive distribution.

Operational Workflow

1. Feeding: Lids move from punching machines via conveyor belts to stacking devices.
2. Separation: A feed rod’s cutting blade separates individual lids from the stack.
3. Clamping: The feed rod transports lids to rotating clamps, lifted by a cam to the injection position.
4. Injection: A top press secures the lid, followed by mechanical/electronic adhesive injection.
5. Ejection: Post-injection, clamps return lids to the machine surface, and feed rods transfer them back to conveyors.

Adhesive Film Volume & Measurement

Key Determinants: Can size/type, roll seal design, and contents.

Optimal Adhesive Volume Ensures:

• Gap filling without overflow
• Compression resistance enhancement
• Uninterrupted double roll seal formation

Measurement: Film weight (mg) = Film volume (mm³) × Dry adhesive density.

Critical Influencing Factors

1.Adhesive Properties:

• Viscosity and total solid content (batch-consistent post-manufacturing).
• Temperature sensitivity requiring injection condition adjustments.

2.Injection Conditions:

Pressure Ranges:

• Solvent-based: 30–50 psi (206.84–344.74 kPa)
• Water-based: 15–30 psi (103.42–206.84 kPa)

Nozzle aperture (0.5–0.9 mm) and needle timing adjustments for uniformity.

Pre-Use Protocols

Adhesives must be stirred/pre-treated to ensure consistency before injection.