Dip Tube Extrusion Line for Cosmetic and Aerosol Packaging

A dip tube extrusion line is a complete single screw production system that produces narrow plastic tubes used inside lotion pumps, perfume sprayers, aerosol valves and trigger sprayers. The line takes LDPE or PP pellets through an extruder, shapes the tube through a precision die, locks the diameter via vacuum calibration, strips surface moisture with an air-knife system, pulls the tube at synchronized speed, and cuts it to exact length with servo-controlled cutting, square, V-shape, or angled, depending on the pump design.

Jinxin supplies the dip tube extrusion line, not the finished dip tubes. The line is configured around the buyer’s finished tube sample, material, diameter range, cut profile and collection method.

A typical production process includes: LDPE or PP pellet feeding, single screw extrusion, precision die forming, vacuum calibration for OD control, 360° air-knife moisture removal, synchronized haul-off, servo cutting, either square, V-shape or angled, or winding for bulk collection.

The exact process flow is configured around the finished tube sample, material, diameter range and pump assembly requirements. Jinxin verifies the process with a product-based test run before shipment.

Both are common in dip tube production. LDPE is the standard for lotion pump and cosmetic dip tubes, flexible enough to curve inside the bottle and rigid enough to hold its shape during automated insertion. PP is preferred for aerosol valve dip tubes where higher stiffness and chemical resistance are needed.

The screw geometry, compression ratio and temperature profile are different for each material. Jinxin reviews the buyer’s material target and configures the line accordingly. The line is not a universal system, and material should be confirmed before quotation.

The line handles tubing typically in the 3-10 mm OD range, and the exact range depends on die tooling. The leak-proof vacuum calibration system maintains ±0.05 mm OD tolerance with uniform wall thickness across production runs. Jinxin verifies this tolerance during the pre-shipment production trial with the buyer’s specific material.

Yes. The servo-driven rotary cutter supports square, V-shape, and slanted, or angled, cuts. However, the line ships with one standard cutting head. The buyer needs to specify the cut profile and V-angle requirements before Jinxin configures the line. Jinxin manufactures and installs the custom cutting head during production, then verifies the cut geometry during the product-based test run using the buyer’s actual material.

The root cause of assembly rejects is dimensional drift during extrusion, not just average OD, but ovality and micro-variations along the tube length. If the OD is even slightly undersized or out-of-round, the tube lacks the interference fit needed to seal inside the pump head. If oversized, it will not insert at all.

Jinxin controls this through two upstream mechanisms, not end-of-line inspection:

1. Vacuum Sizing Tank: The leak-proof vacuum system holds the molten tube against the calibration sleeve under stable negative pressure, ensuring roundness and holding OD/ID within ±0.05 mm across the production run.
2. 360° Air-Knife Channel: Strips all surface moisture before the tube reaches the haul-off unit. This eliminates micro-slippage in the traction rollers, a common cause of intermittent stretching that creates diameter variation downstream.

The result is a tube that is consistently round and dimensionally stable, so it seats reliably in automated assembly equipment without fall-off or leakage.

Some buyers use the phrase “dip tube making machine,” but it can refer to many different processes, including dip tube cutting machines, assembly equipment, or metal tube bending systems. On this page, Jinxin is referring to a complete dip tube extrusion line, from pellet feeding through extrusion, die forming, vacuum calibration, air-knife drying, haul-off and servo cutting or winding.

Jinxin does not manufacture dip tube cutting machines or dip tube assembly equipment.

• Lead time: Typical lead time is usually confirmed in the quotation according to line configuration, tooling, electrical setup and test-run requirements. For many standard dip tube line configurations, production including mechanical fabrication, electrical assembly, PLC programming and production trial is commonly in the 50-60 working day range from deposit.
• Warranty: 12 months full-line coverage; HMI touchscreen extended to 18 months. Tier-1 components such as Siemens and ABB carry their own manufacturer warranties.
• Packing: Fumigation-free wooden crates with anti-rust treatment and moisture-proof film. The stainless-steel cooling tank ships separately on a steel pallet due to size.