Core Technical Characteristics

Typical lines integrate a single‑screw extruder capable of processing polypropylene, polyethylene, or thermoplastic elastomers at melt temperatures between 180 °C and 230 °C, with output rates ranging from 30 kg/h to 120 kg/h depending on screw diameter and L/D ratio.

Downstream molding stations shape the extruded tape into interlocking teeth using precision‑machined cavities; tooth pitch commonly falls between 3 mm and 5 mm, while tooth height is controlled within ±0.05 mm to ensure consistent slider engagement.

Take‑up units maintain constant tension, typically set between 0.5 N and 2.0 N, to prevent tape deformation during cooling, and integrated sensors monitor width variation within ±0.1 mm across the coil length.

Why These Systems Suit Specific Industries

• Apparel manufacturers benefit from low‑profile coil designs that reduce bulk in seams while maintaining tensile strength above 15 N/mm.
• Automotive interior suppliers require UV‑stabilized polymers; extrusion lines can incorporate additive feeders achieving <5 % color shift after 500 h UV exposure.
• Luggage and outdoor gear producers need abrasion‑resistant teeth; surface hardness measurements (Shore D) typically exceed 70 for modified PE blends.
• Medical device packaging demands antimicrobial additives; metering pumps allow precise dosing of silver‑based compounds at 0.1 %–0.3 % weight.

Standard Specification Overview

Customization Options

• Tooth geometry: standard, reverse, or concealed profiles to match specific slider designs.
• Coil width: customizable from 4 mm to 20 mm in 0.5 mm increments.
• Line speed: adjustable via inverter drives; optional closed‑loop tension feedback for high‑speed runs.
• Control platform: PLC‑based with HMI, supporting recipe storage for rapid material change‑over.
• Additive integration: side‑feeders for UV stabilizers, pigments, or antimicrobial agents with gravimetric dosing accuracy ±0.2 %.

Quality Control Philosophy

Inspection begins at the extruder melt pressure sensor, where deviations >5 % trigger automatic alarm and feed‑rate correction.

Inline laser micrometers monitor tape width and thickness every 100 mm, logging data for statistical process control; out‑of‑tolerance sections are marked for removal.

Finished coils undergo tensile testing on five random samples per batch; acceptance criterion is minimum break force of 12 N/mm with coefficient of variation <8 %.

Visual inspection stations equipped with 40× magnification lenses check for flash, burrs, or misaligned teeth; defect threshold is set at 0.1 % of total length.

Frequently Asked Questions

• Can dimensions be customized? Yes, tooth pitch, coil width, and line speed are adjustable per project requirements; tooling changes typically require 2–3 weeks.
• What information is needed before quotation? Polymer type, target output (kg/h), desired zipper specifications (pitch, tape width, slider type), and any required additives.
• What materials are available? Standard grades include PP, PE, TPE; engineered grades with UV stabilizers, flame retardants, or antimicrobial agents can be sourced upon request.
• How is quality inspected? Through melt pressure monitoring, laser diameter gauging, tensile testing, and visual inspection as described in the QC section.
• What packaging methods are available? Coils are wound on reusable plastic cores, wrapped in polyethylene film, and placed in corrugated cartons; custom palletization is offered for bulk orders.
• How are export shipments protected? Moisture‑barrier bags, corner protectors, and climate‑controlled containers maintain polymer integrity during transit.
• What is the typical production lead time? Standard configurations ship within 4–6 weeks after order confirmation; customized tooling extends lead time to 8–10 weeks.
• How are samples arranged? Small‑length sample coils (≈5 m) can be produced within 5 working days and shipped via express courier at customer expense.