The left and right sides separately coming from two nylon zippers which have the same model and specification are mutually assembled into a complete and qualified nylon mutual-assembled zipper.
Below are some guidelines for nylon mutual-assembled zippers.
These zippers are usually found in plackets of cotton-padded clothes that have detachable layers and various other products that need mutual matching such as coats, sleeping bags, tents, luggage, shoes, etc.
Not only must these zipper have the same model and specification, but also these zippers must be made from the same batch to minimize the deviation.
Deviation, dimension and tolerance
Because of the elasticity of nylon zippers, the dimension of these zippers with the same specifications may also have differences. It is acceptable if the deviation is up to the international tolerance standards. Moreover, the teeth interval of these zippers from dissimilar batches may differ because of the diverse manufacturing techniques. Thus, it can be said that not all nylon zippers can be mutually assembled seamlessly, with a deviation of 1.5cm or less.
For assembling zippers better, the internal layer nylon zipper must be shorter than the external layer zipper, which ranges from 0.3cm - 0.5cm.
Spray painted and electroplated sliders are applicable for nylon mutual-assembled zippers.
It is recommended not to spray chemical agents directly on zippers to clean oil stains or dirt during manufacturing process.
In order to protect zippers from oxidation, corrosion and discoloration, it is necessary to dry these zippers completely after ironing and then pack them with plastic bags.
It is necessary to store these zippers in dry not corrosive or damp environment. Do not expose these zippers to strong sunlight directly and for a long time.