according to the size: 3#, 4#, 5#, 8#, etc. The zipper size changes according to the size of the microphone teeth. Because it is often used on jeans, coats and backpacks, its zipper size is relatively large.

According to the type: closed zipper, open zipper (probable separation), double closed tail zipper (X-zipper and double pull head opposite or O-zipper and double pull head opposite), double open tail zipper (reverse open probable separation) microphone tooth material: existing material types are aluminum alloy, brass, white copper, zinc alloy, etc. The color of metal microphone teeth is often as needed electroplating up, such as aluminum microphone teeth plated yellow, brass microphone teeth plated white, black nickel, bronze, red bronze, gold and other colors. The composition is the same as that of other zippers, and the composition of metal zippers is also made up cloth it consists of Belt, microphone tooth, pull head and limit code.

Woven belt: the material is generally fiber belt, cotton tape, or polyester fiber belt, etc., can be selected according to different purposes5# gram double Open tail zipper the same material.

Microphone teeth: metal zippers on the market are mostly made of aluminum alloy, brass, white copper, zinc alloy and other materials. Because the color of the microphone teeth on the metal zipper is electroplated, if the storage is improper, its teeth will turn black and pollute dress material. As for the microphone teeth of copper alloy, oxidation is easy to occur. Therefore, it is necessary to ensure certain ventilation during storage. Do not seal the storage or store it in a moisture-filled environment, use keep dry paper or dehumidizer when necessary.

Pull head: metal zipper slider colors are bronze, red bronze, white, yellow, black nickel, black and white nickel, matte silver respectively. Generally, the color of metal zipper slider is required to be the same as that of the metal zipper. According to regulations, common pull head parameters are:

3# metal zipper slider mouth height is 2.1-2.2mm, mouth width is 4.55-4.65

5# metal zipper slider mouth height is 2.7-2.8mm, mouth width is 6.0-6.05

limit code: it is divided into upper stop (front code) and lower stop (rear code). The main function of up and down stop is to prevent the pull head from being pulled off.

Metal zipper selection

woven Belt: since the raw materials of metal zipper cloth woven belt are made up of different kinds of silk threads such as polyester silk thread, stitching thread, and core thread, their components and colorability are different, so color difference is easy to occur on the same zipper, at this time, when selecting woven belt, we should choose those with uniform dyeing and no turbid spots. Woven belt made of different fabrics are mainly soft to the touch.

Mi tooth: The mi tooth of the metal zipper is also plated and colored, so when purchasing, you must pay attention to whether the color plating on its surface is uniform, whether there is a phenomenon of color tone, and whether it is smooth when pulling the zipper up and down. After the zipper is closed, it must be observed whether the left and right teeth all bite each other. Asymmetric zipper teeth will definitely affect the use of the zipper.

Pull head: There are many shapes of metal zipper pull head, and the finished product can be small and meticulous, as well as rough and majestic. However, no matter what kind of pull head, you must feel whether the pull head is free and whether the zipper cannot be pulled or cannot be closed. Now the pullers sold on the market are equipped with self-locking devices, so after the zipper is pulled up, it is necessary to check whether the zipper will slide down after the lock head is fixed. Limit code: the upper and lower stop must be tightly fastened to the microphone teeth or pliers on the microphone teeth, and it must be ensured that when cleaning or processing the clothing, pay attention:

1. After the wool knit product is ironed, make sure that the zipper is fully cooled before packaging. Otherwise,

the metal zipper will react with the water vapor and easily change color. Second, after processing clothing products, some chemical reagents are easy to remain, and then it is easy to react with metal zipper. Therefore, before assembling the metal zipper, it is necessary to ensure that the leather has been fully cleaned and neutralized.

Reminder

because zippers have different adaptability in different environments, you must inform the manufacturer which products your zipper will be applied to when selecting and purchasing zippers, and you should also inform the manufacturer of your requirements for Zipper composition, such as whether the needle can be passed. In addition, azo components are prohibited in general dyes, because dyed zippers may induce some skin diseases after contacting with human body. Maintenance skills

i. Scientific use of metal zipper:

1. When pulling the metal zipper, the teeth on both sides must be close first, and the top must be aligned, and then gently pull along the track by holding metal zipper head, and cannot pull too hard.

Metal zipper2. When moving metal zipper head, be careful not to heave in sundries such as placket or cloth edge into the metal zipper, so as not to cause "tooth skew", "broken belly", "tooth removal" and other phenomena.

3. If the metal zipper is astringent and not easy to pull, do not pull it hard. Apply some wax or soap on the metal zipper to pull it.

4. If the metal zipper head single tooth is divided and loose, the popular Shanjun pliers can be used to gently clip the metal zipper at the closing end of metal zipper head. The metal zipper will immediately get better, and the single tooth will be tight, no more cracking.

Second, prevent the metal zipper from moisture, oxidation, rust and discoloration.

1. Avoid contact with humid environment: because metal zipper will cause part of teeth to turn black due to metal oxidation and dyeing.

2. Avoid contact with rubber band: because the rubber band itself contains sulfide, when the rubber band is used to bundle metal zipper, metal chain teeth will be vulcanized (blackened).

3. Clean and dry in time after washing: because the dye or residual chemicals in the fabric have redox reaction with metal parts, which may cause discoloration of metal parts.

Cause

a. Reasons for discoloration of metal zipper made of copper alloy (white copper, red copper, brass):

when used on metal products or wool products, metal zipper will cause part of teeth to turn black due to metal oxidation. This is because the dressed leather agent used to make leather and bleacher on woolen products remain on the products during the processing process, the gas of the products will cause the discoloration of the metal zipper.

Examples of chemical reactions: oxidation Bleacher (H2O2)& rarr; Black (CuO) or red (CuO2);

b. Reasons for the discoloration of the metal zipper of the rubber band bundle:

the rubber band itself contains sulfide. When the rubber band is used to bundle metal zippers, metal chain teeth will be vulcanized (blackened).

Examples of chemical reactions: Conditions for excess sulfide or HS2 gas & rarr; Black [CuS]

c. Reasons for discoloration caused by contact with acidic compounds or chromium compounds.

Examples of chemical reactions: acidic compounds and chromium compounds [cr203] & rarr; Black [CuO, Red [CuO2] or Blue [CuSO 4].