Bottom Stop Pin Box for Zipper Accessories
This component is a protective storage and dispensing unit designed specifically for bottom stop pins used in zipper chain assembly. It maintains pin integrity by shielding them from dust, moisture, and electrostatic discharge while enabling reliable feeding into automated insertion equipment.
Design and Construction
The box body is formed from anti‑static polypropylene with a wall thickness of 2.0 mm, providing mechanical rigidity and a surface resistivity below 10⁹ Ω·sq. Internal dividers are molded in the same material to create individual compartments that prevent pin‑to‑pin contact.
A hinged lid incorporates a silicone gasket that achieves an IP54 rating against splashing water and particulate ingress. The latch mechanism uses a stainless steel spring (AISI 301) rated for 10,000 actuation cycles without loss of retention force.
- External dimensions: 120 mm × 80 mm × 40 mm (L × W × H)
- Internal cavity: 100 mm × 60 mm × 30 mm
- Pin capacity: up to 500 pieces of 2.0 mm diameter stop pins
- Weight (empty): 45 g
Technical Specifications
| Parameter | Typical Value | Customizable Options |
|---|---|---|
| Overall Dimensions (L×W×H) | 120 mm × 80 mm × 40 mm | ±5 mm per axis; alternative footprints available |
| Material | Anti‑static polypropylene (PP) | ABS, polycarbonate, or conductive grades on request |
| Surface Resistivity | < 10⁹ Ω·sq | Adjustable to 10⁶‑10¹² Ω·sq via additive loading |
| Lid Seal Rating | IP54 (splash and dust) | IP65 version with upgraded gasket |
| Operating Temperature | ‑20 °C to +80 °C | Extended range –40 °C to +120 °C with specialty polymers |
| Pin Capacity | 500 pcs (2.0 mm Ø) | Scalable to 2000 pcs; adjustable divider pitch |
Applications in Zipper Manufacturing
Bottom stop pins are critical for locking the zipper chain at the lower end. Any deformation, contamination, or mis‑feed can cause defective joints, increased rework, and line stoppage. The box provides a controlled environment that preserves pin geometry and delivers pins in a consistent orientation to vibratory feeders or pick‑and‑place units.
Typical integration points include:
- Upstream of automatic pin insertion stations on high‑speed zipper machines (up to 1,200 cycles/min)
- Manual loading benches for low‑volume specialty products
- Transfer conveyors between stamping and assembly cells
By eliminating pin‑to‑pin abrasion and moisture uptake, the accessory contributes to a measurable reduction in defect rates—often reported as a 0.2 %‑0.5 % decrease in joint failures in pilot trials.
Quality Control and Testing
Each production lot undergoes dimensional inspection using a coordinate measuring machine (CMM) with a tolerance of ±0.05 mm on critical features such as lid latch pitch and divider spacing. Material samples are tested for surface resistivity per ASTM D257 and for impact strength per ISO 179.
Functional validation includes a 500‑cycle actuation test of the latch mechanism and a 48‑hour humidity exposure test (85 % RH, 30 °C) to verify that pin surfaces remain free of corrosion or oxidation.
Traceability is maintained via laser‑etched lot codes on the base of the box, enabling rapid recall analysis if required.
Customization Options
Beyond dimensional adjustments, the box can be tailored to specific line configurations:
- Integrated sensor mounts for optical or inductive pin‑presence detection
- Custom color coding (Pantone matched) for visual inventory control
- Logo or part‑number engraving on the lid surface
- Alternative locking mechanisms such as a thumb‑screw or magnetic catch
All custom features are subject to a feasibility review that confirms compatibility with existing feeding equipment and maintains the anti‑static performance baseline.
Frequently Asked Questions
Can the internal dimensions be changed to accommodate different pin sizes?
Yes. The divider pitch and cavity depth are adjustable in 1 mm increments; please provide the pin diameter and length for a quotation.
What information is required before a quote can be issued?
We need the desired external footprint, pin capacity, material preference (standard PP or alternative), any required certifications (e.g., RoHS, REACH), and expected annual volume.
Which materials are available for the box body?
Standard offering is anti‑static polypropylene. Upon request we can supply ABS, polycarbonate, or conductive‑filled grades with specific surface resistivity targets.
How is quality inspected before shipment?
Each lot receives CMM dimensional checks, surface resistivity testing, latch cycle validation, and a visual inspection for surface defects. A certificate of conformance is included with every shipment.
What packaging methods are available for export?
Boxes are packed in corrugated cartons with interior dividers; optional anti‑static bags or foam inserts can be added. Palletizing and fumigation‑treated wood pallets are available for international shipments.
What is the typical production lead time?
Standard configurations ship within 10‑12 working days after receipt of purchase order. Customized designs may extend lead time to 3‑4 weeks depending on tooling requirements.
Ready to Discuss Your Requirements?
If you need a bottom stop pin box that matches your zipper line’s speed, pin specifications, and environmental controls, please reach out for a detailed technical review.
Request a Quote