Zipper
Commonsense for Zipper
A: Commonly-used Method for Discerning the Quality of Zipper
Band: The dye for the band should be even without stain and scar, Touched by hand, it feels Soft. The band looks like wave in the direction vertically and horizontally.
Teeth: The suface of the teeth should be smooth. When used, it fees soft without noise.
Brace: The brace should go smoothly and freely,fastened but willnot come off.
Hem: The hem fits the band will without breaking and coming off. Separating pin of separating unit and retainer of Scaparating unit: Square Bolt can be adopted freely.
Top Stop: The top-stop must come together with the first tooth on metal zippers and wilon. But the distance can not be over lmm and should should be firm and looks fine.
End stop: The bottom stop must come together with the teeth or be fastened on surface and should be firm and look fine.
B: Tips for Selecting the Zipper
Different zipper suits different conditions, hence when buying zippers the following matters should be pointed out to the manufacturer:
1. Where will the zipper be used(such as leat her trunk, footwear, jackit, raincoat, tent, jeans needing hard washing and leather products with high acidity)or other special special requirements.
2. requirements for the content or zipper:does not need containing AZO or nickel and pass needle detector.
C: Allowable Tolerance of Zipper Length
Due to the inertie caused by the speed of machine operation during the manufacfacturing of zipper as will as the completeness of the teeth, there will appear allowable tolerance.
The longer the zipper is the bigger the allowable will be.
| Size | Specification(mm) | |
| Base Spec. | Tolerance | |
| 3# | ≤315 | ±3 |
| ﹥315~630 | ±5 | |
| ﹥630~1000 | ±6 | |
| ﹥1000 | ±（L×1%) | |
| 4# | ≤315 | ±4 |
| 5# | ﹥315~630 | ±6 |
| 7# | ﹥630~1000 | ±7 |
| ﹥1000 | ±（L×1%) | |
| 8# | ≤315 | ±5 |
| 10# | ﹥315~630 | ±7 |
| ﹥630~1000 | ±9 | |
| ﹥1000 | ±（L×1%) | |
| Zipper Length(cm) | Allowable Tolerance |
| below 30 | ± 5mm |
| 30-below60 | ±10mm |
| 60-below100 | ±15mm |
| above100 | ± 3% |
Type of Zipper
 | ||||
| Closed-end Zipper (Non-separable) | Open-end Zipper (Separable) | Two Way Open End Zipper (separable) | Two Way Close-end Zipper O Tape | Two Way Close-end Zipper X Tape |
Methods of Zipper Measurement
| Classification | Dimensions | A=The standard length of the zipper |
| Closed-end Zipper | From the top end of the slider to the tip of the bottom stop. |  |
| Open-end Zipper | From the top end of the slider to the tip of the open part. |  |
| Two Way Open End Zipper | From the top end of the slider to the tip of the bottom end of the supplementary tape. |  |
| Zipper with Double Slider (Arranged in Head-Relation) | From the top end of the slider to the tip of the tip of the other bottom stop. |  |
| Zipper with Double Slider (Arranged in Bottom-to- Bottom Relation) | From the top end of the slider to the tip of the tip of the other bottom stop. |  |
