YKK - Little Parts. Big Difference.


Clever Uses of Zippers

Selection of zippers according to materials and usage

For example, when the No.3 zipper was used for thick fabrics over 12 ounces, the fabric or pull-tab broke.
Use No.4 or higher zippers for thicker fabrics. (Use No.3 for thin fabrics.)
The notch lock slider (shoulder stop) dropped when it was used for the front of an outer garment.
Use an automatic slider that locks automatically for the front of a garment (the CA slider and the ZA slider give variety to pull-tabs)
If the pinlock(DP) slider is used for a pocket, there is a danger of injury from projecting parts.
Avoid using the pinlock slider. Use the DA type(automatic) slider or the DF type(non-lock)slider.

Washing treatment

Discoloration or abrasion of zippers occurred after various washing processes. The tape weakened and tore because of the chemicals in the wash.
Use the YG type(No.3-No.5),which is relatively resistant to washing processes.
Rinse thoroughly to ensure acids do not remain on the zipper after washing.
Test beforehand because the washing process and the chemicals can have unexpected effects.
A slider broke when the DA type was used for an article given washing treatment.
If washing treatment is performed with the zipper open, the slider can be hooked and Broken in the tumbler.
Wash with the zipper closed.
Use the GS slider(semi-automatic)

Dye migration


The elements of the zippers(N,G,B) became black and discolored of stained the fabric.
Because of the properties of copper, copper alloy goes black when oxidized.
Do not seal articles in polyethylene bags or corrugated cardboard boxes, and store products away from moisture.
Use EXCELLA or EVER BRIGHT, which are resistant to discoloration, because each of their elements is surface treated.
When zippers were stored in bundles held together with rubber bands, the area under the rubber band discolored.
Avoid using rubber bands to store zippers for prolonged periods.


When a brown or black dyed zipper was used, the portion of the cloth coming in contact with the zipper was stained.
When an acid substance or an oxidizer remains in the cloth or in materials after dying of finishing, the cloth coming in contact with the zipper may stain due to chemical changes.
Use only cloth and materials that have been thoroughly washed after treatment.
Paraffin melted when the heat of an iron reached the cloth and staining occurred.
Elements of zippers are finished with paraffin to facilitate sliding. When ironing, place paper or cloth on the part coming in contact with the zipper.


A zipper made of or coated with nickel caused an allergic reaction on direct contact with the skin.
When a silver-colored metal zipper is requires, choose an aluminum zipper.
Specify an "anti-nickel" zipper when placing an order.
Form-fixing treatment
When form-fixing treatment such as VP processing was given, the zipper discolored or corroded.
When applying VP treatment, use items that are relatively resistant to corrosion. For SSP or double action(as well as for VP processing), please test beforehand.
Broken needle problem.
When sewing, do not insert a needle into the metal parts of a zipper. This can break the needle.
When opening or closing a zipper, the slider caught the fabric.
When sewing a zipper on an article, secure enough width for the slider to move. Check that the slider works smoothly.
When sewing with a lock sewing machine, the wrap of the zipper tape was cut and the zipper frayed.
As the zipper tape is made of woven fabric, do not cut the wrap to avoid fray.
Zippers do not work smoothly after bio-treatment.
Depending on the chemicals used in the bio-treatment, the zipper can corrode.
Be sure to test the zipper beforehand.
Points to be noted when using zippers in babywear.
Special zippers, such as zippers with plastic tops and bottom stops, are offered for babywear.
Please ask sales staff.
The slider caught the fabric, and the fabric tore or the zipper got stuck.
Pull back the slider to the original point as if removing a resisting object.
※ Do not use excessive force. Ease up the zipper gently as the pull-tab can break.
The slider was broken by excessive ironing pressure when a garment was sent to the cleaners.
YKK requests the laundry industry not to iron close to the slider.
Elements of a zipper melted while ironing because the garment was pressed without a cloth over the zipper.
VISLON® = 130℃ EFLON® = 150℃ CONCEAL® = 160℃
When pressing, check the heat-resistance of the zipper, then place cloth over the zipper.
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