Manufacturing/Zone 05 — Testing Center
Production Zone 05Plastic Cap Testing: Dimension, Appearance, Assembly, Seal & Transport
FANXUN tests plastic closures against drawing and sample requirements—dimensional fit, visual defects, assembly accuracy, material/color match, drop and transport simulation, and seal/leak performance. Seal and leak testing is the most critical check before shipment.
What We Test On Plastic Caps
Testing covers oil caps, spout caps, tamper-evident caps, and other custom closures—not generic visual checks alone.
Seal and leak testing is the most important step. After the cap is fitted to a bottle neck or test fixture, we check for air leakage, liquid leakage, and poor sealing. In addition, dimensional, appearance, assembly, material/color, and drop/transport checks support buyer specifications for lubricant and packaging closures.
- Priority testSeal / leak on neck or fixture
- DimensionalDiameter, height, thread, liner, sealing face
- AppearanceBlack spots, flash, warp, color, scratches, short shot, sink
- AssemblySpout, TE, liner, and gasket combo caps
- TransportDrop and shipping simulation
- UpstreamQuality Control
Continue Through The Manufacturing Zones
See Quality Control, Injection Molding, or Certifications.
Six Cap Testing Categories
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Dimensional Inspection
Check diameter, height, thread, liner/plug, and sealing face against the drawing. This is critical for oil caps, spout caps, and tamper-evident closures.
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Appearance Inspection
Screen for black spots, flash, deformation, color difference, scratches, short shot (缺料), and sink marks from injection molding.
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Assembly Inspection
For combo caps—spout caps, tamper-evident caps, caps with liners, or caps with gaskets—verify that assembly is fully seated and correct.
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Drop & Transport Simulation
Simulate packaging and shipping to check whether caps crack, deform, or come apart during handling and transport.
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Material & Color Check
Confirm the resin grade is correct and that color matches the customer-approved sample.
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Seal & Leak Testing (Most Critical)
After fitting the cap to a bottle neck or test fixture, verify there is no air leak, liquid leak, or poor sealing. This is the primary pass/fail gate for closure programs.
Testing Center Gallery
Six test categories for plastic caps — dimensional, appearance, assembly, transport, material/color, and seal/leak.
Testing Center Summary
| Category | What We Check | Notes |
|---|---|---|
| Seal & leak (priority) | Air leak, liquid leak, poor sealing | Cap fitted to bottle neck or test fixture |
| Dimensional | Diameter, height, thread, liner, sealing face | Critical for oil, spout, and TE caps |
| Appearance | Black spots, flash, warp, color, scratches, short shot, sink | Visual defect screening |
| Assembly | Combo-cap seating and fit | Spout, TE, liner, gasket programs |
| Drop / transport | Crack, deformation, loose parts | Packaging and shipping simulation |
| Material & color | Correct resin and color vs sample | Customer-approved master sample |
| Upstream / next | QC handoff → certifications | Quality Control · Certifications |
Frequently Asked Questions
What is the most important cap test at FANXUN?
Seal and leak testing. After the cap is fitted to a bottle neck or test fixture, we check for air leakage, liquid leakage, and poor sealing. Other checks support fit and appearance, but seal performance is the primary gate.
Do you check dimensions and appearance as well?
Yes. Dimensional inspection covers diameter, height, thread, liner/plug, and sealing face against the drawing—especially important for oil caps, spout caps, and tamper-evident caps. Appearance screening covers black spots, flash, deformation, color difference, scratches, short shot, and sink marks.
How do you test combo caps and shipping risk?
For spout, tamper-evident, liner, and gasket assemblies, we verify assembly seating. Drop and transport simulation then checks whether caps crack, deform, or come apart during packaging and shipping.
What should I share for a testing or production quote?
Share the drawing or sample, bottle neck type, application (for example lubricant), and any required seal/leak or dimensional tolerances. Then our team will confirm the QC and testing path with Quality Control.
See also FAQ and Manufacturing overview.
Discuss A Custom Closure Project
Share your application, drawing, or seal requirement. Our team responds within 12 business hours.
