How Does SBS Zipper Control The Zipper Quality

various types of zips

Zippers, at first glance, are simple devices. But behind this facade of simplicity lies a product of complex engineering, one that relies on the structural integrity of its parts to function perfectly. Every link has to be fitted correctly, every tooth to be precisely shaped. Any imperfections can cause the whole zipper to get stuck or be rendered useless in its entirety.

Since zippers are used as fasteners for a whole variety of garments, they are also subject to the same stringent standards that clothes are usually tested for (e.g. tests that simulate frequent laundering as well as daily wear and tear).

Here are some of the quality standards that are commonly measured in the production of SBS zippers.

Size
Zippers are supposed to perform their intended function 100% of the time. Using statistical analysis, all parts of the zipper are meticulously sized and scrutinized to ensure that they fall within an acceptable size range. Should these dimensions be of the incorrect size, the reliability of the zipper and the garment itself is compromised.

Though the sizes that fall within a certain percentage of the desired size range is acceptable based on the quality standards, SBS Zipper always aims for 100%.

Strength
Zippers, especially heavy duty zippers intended for clothes and objects that go though a lot of wear-and-tear, should not break or be torn off easily. Both the teeth and the entire zipper should be able to withstand a lot of force.

To test the strength of the teeth, we use a tensile testing machine. A hook is attached to a tooth and the machine applies force to it until it breaks away from the cloth (a gauge then measures and records the breaking point).

The entire zipper also goes through a similar testing procedure. First, a testing machine is attached to the zipper tape on each side. The machine pulls on it until the zipper is completely torn into two pieces.

Heavy duty zippers (those commonly used for bags, luggage, heavy jackets and coats) are required to pass higher strength values than lightweight zippers.

Flatness and Straightness
To test for flatness, the zipper is passed through a gauge that is set at a specific height. If any part of the zipper touches the gauge, it is deemed defective and will be discarded immediately.

The zipper is also laid and measured against a straight edge to ensure that it doesn’t curve.

Ease of Zipping
A dedicated tensile testing machine measures the amount of force necessary to zip a zipper up and down.

Lightweight zippers (the kind used for garments) often have a force value that is lower than zippers used for mattress covers and bags. This is to ensure that a person of average strength can easily zip his or her clothes without tearing the fabric material.

Washing Machine Readiness
Zippers are tested for their washing machine readiness by being washed repeatedly with hot water, bleach, and abrasives. This is also a great way to test if the zipper material is colorfast and won’t bleed its dye into a person’s clothes.

For shrinkage, the length of the zipper is measured after several washings. At SBS Zipper, the rate for shrinking is controlled at 1% – 4% for lightweight zippers.  For heavyweight ones, we always aim for a zero-percent shrinkage rate.

Click here to learn more.

Reference
www.madehow.com

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