Metal zipper is a kind of zipper, which refers to the zipper whose microphone teeth are made of copper, cupronickel or aluminum material. Compared with nylon zipper and resin zipper, it is stronger and is mostly used on jeans, jackets and backpacks.
Metal zipper classification:
According to the size: 3#, 4#, 5#, 7#, 8#, etc. The zipper size changes according to the size of the microphone teeth. Since it is often used on jeans, jackets and backpacks, its zipper size is larger.
According to the type: closed zipper, open zipper (detachable), double closed tail zipper (X-zipper and double slider opposite ends or O-zipper and double slider opposite to each other), double open end zipper (reverse opening can be separated) Demolition) microphone tooth material: Ao Shiqi's existing material types are aluminum alloy, brass, cupronickel, zinc alloy, etc. The color of metal microphone teeth is often plated according to needs, such as aluminum microphone teeth plated with yellow, brass microphone teeth plated with white, black nickel, green bronze, red bronze, gold and other colors. The composition is the same as other zippers. The composition of the metal zipper is also composed of cloth tape, microphone teeth, slider and limit code.
Fabric tape: The material is generally fiber tape, cotton webbing or polyester fiber tape, etc. Different materials can be selected according to different purposes.
Microphone: The metal zippers on the market are mostly made of aluminum alloy, brass, cupronickel, zinc alloy and other materials. Since the color of the microphone teeth on the metal zipper is electroplated, if it is not stored properly, the microphone teeth will turn black. And it will pollute the fabric. For copper alloy microphone teeth, it is prone to oxidation. Therefore, it is necessary to ensure a certain degree of ventilation during storage. Do not store in a sealed container or in a humid environment. Use moisture-proof paper or dehumidifier if necessary.
Pull head: The color of the metal pull head is green bronze, red bronze, white plating, yellow plating, black nickel, black and white nickel, matt silver. Usually, the color of the metal slider is required to be the same as the microphone teeth of the metal zipper. Same color.
According to the regulations, the commonly used slider parameters are:
The mouth height of 3# metal slider is 2.1-2.2mm, and the mouth width is 4.55-4.65
The mouth height of the 5# metal slider is 2.7-2.8mm, and the mouth width is 6.0-6.05
Limit code: divided into top stop (front code) and bottom stop (last code). The main function of the up and down stop is to prevent the slider from being separated from the microphone teeth.
Metal zipper options:
Tape: Since the raw material of the metal zipper tape is composed of different types of silk threads such as polyester thread, suture thread, central thread, etc., its weight and coloring are different, so it is easy to produce color difference on the same zipper. When selecting the tapes, the dyeing should be uniform and there is no turbid point. The tapes made of different fabrics are mainly soft to the touch.
Micro teeth: The microphone teeth of the metal zipper are also electroplated and colored, so when purchasing, you must pay attention to whether the surface is evenly plated, whether there is any color flower phenomenon, and whether the zipper is smoothly pulled up and down. After the zipper is closed, it is necessary to observe whether the left and right teeth are engaged with each other. Asymmetric zipper teeth will definitely affect the use of the zipper.
Puller: There are many shapes of metal zipper pullers, and the finished product can be small and delicate, or rough and majestic. But no matter what kind of slider, it is necessary to feel whether the slider can be pulled freely, and whether the zipper cannot be pulled or closed. The sliders on the market are equipped with self-locking devices, so after the zipper is pulled, it is necessary to check whether the zipper will slide down after the lower lock is fixed. Limit code: The upper and lower stops must be tightly fastened to the microphone teeth or clamped on the microphone teeth, which must be firm and perfect.
Metal zipper maintenance tips
Scientific use of metal zippers:
1. When pulling the metal zipper, the teeth on both sides must be brought close to each other, the top must be aligned, and then the metal zipper head must be pulled gently along the track, and cannot be pulled too hard.
2. When moving the metal zipper head, be careful not to twist the placket or cloth edge into the metal zipper, so as to avoid the phenomenon of "skewed teeth", "broken belly", "tooth loss" and so on.
3. If the metal zipper is astringent and difficult to pull, do not pull it hard. You can apply some wax or soap on the metal zipper to pull it.
4. If the unilateral teeth of the metal zipper head diverge and become loose due to wear and tear, you can use ordinary Shanjun pliers to gently clamp the closed end of the metal zipper head laterally.
Protects metal zippers from moisture, oxidation, rust and discoloration:
1. Avoid contact with wet environment: because the metal zipper will turn black due to metal oxidation.
2. Avoid contact with the rubber band: Because the rubber band itself contains sulfide, when the metal zipper is bundled with the rubber band, the metal teeth will be vulcanized (blackened).
3. Wash and dry in time after washing: Because the dyes or residual chemicals in the fabric have redox reactions with metal parts, it may cause discoloration of metal parts.
Metal zipper discoloration reasons:
a. Reasons for discoloration of metal zippers made of copper alloys (white copper, red copper, brass):
When used on metal products or wool products, the metal zipper will cause some teeth to turn black due to metal oxidation. This is because when the leather curing agent for leather and the processing bleaching agent for woolen products remain on the product during the treatment process, the gas of the product will cause discoloration of the metal zipper.
Examples of chemical reactions: Oxidative bleach (H2O2) → black (CuO) or red (CuO2);
b. Reasons for discoloration of metal zippers bound by rubber bands:
The rubber band itself contains sulfide, and when the metal zipper is bundled with the rubber band, the metal teeth will be vulcanized (blackened).
Example of chemical reaction: Condition of excess sulfide or HS2 gas → black [CuS]
c. Causes of discoloration caused by contact with acidic compounds or chromium compounds.
Examples of chemical reactions: acidic compounds and chromium compounds [Cr2O3] → black [CuO, red [CuO2] or blue [CuSO4].