Button product inspection needle and environmentally friendly nickel-free detection solution

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Source：    View：2856    Time：2019/5/9 16:37:53

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Many customers require button products to be environmentally friendly, lead-free and nickel-free, and post-plated products can pass the inspection. In fact, this statement is very general and a misunderstanding. The following is a detailed explanation of this item.

First, the EU RoHS certification

1. In the EU RoHS certification directive: in the newly launched products: lead (Pb), mercury (Hg), hexavalent chromium (Cr (VI)), polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) content Do not exceed 1000ppm respectively, and the content of cadmium (Cd) should not exceed 100ppm.

2. In these projects, our electroplating process will involve, for example, alkali copper, the use of copper-tin-tin in unsuitable lead-containing brighteners, the use of hexavalent chromium, cadmium plating, etc., which are controlled by the electroplating site.

Second, the product does not contain nickel requirements

In Europe, the United States, Japan and other countries, clothing, clothing accessories, jewelry and other products plating parts, generally require the detection of nickel standard release. Nickel limit requirements: European standards specify that the release of nickel in clothing, jewelry and other products should not exceed 0.2ug/cm2/week.

At present, in the clothing, jewelry and other daily necessities exported to Europe, the United States, Japan and other countries, such as: button, belt, necklace, hardware and other clothing plating products, if the material composition contains nickel-containing metal accessories, generally requires nickel The standard release amount is tested. Why check if the plating product contains nickel? This is because nickel Ni is an element that easily causes contact allergy. Nickel is absorbed by the skin after it is released by some nickel-containing materials and is in contact with the skin for a long time. Nickel is released by some nickel-containing materials and will be absorbed by the skin after prolonged contact with the skin, which may cause allergies to some individuals; further exposure to soluble nickel salts may lead to national contact dermatitis (according to statistics, 20% of people Nickel has obvious symptoms of allergic reactions. Therefore, it is exported to Europe, the United States, Japan and other countries for clothing, clothing accessories, jewelry and other products, generally require the detection of nickel standard release.

Third, electroplating products require export environmental protection will involve:

1. Can not contain nickel, no nickel plating (also known as non-toxic plating)

2. Can not contain lead (Pb), mercury (Hg), hexavalent chromium (Cr)

Fourth, the electroplated parts have passed the inspection needle

1. Over-inspection refers to the terminology of a special inspection operation that must be carried out on textiles such as clothing/toys. Since the needles are broken in the textile during the sewing process, these broken needles will cause harm to the consumer. Therefore, in order to find out in time that the clothing and accessories are damaged during the manufacturing process, the inspection of the metal substance caused by the customer is called an over-detection needle. Clothing exported to Japan, Europe and the United States and other countries have this requirement. The popular name is: check the needle.

2. Inspection principle of needle inspection machine: It is mainly used for the detection of magnetic induction of textile ferromagnetic metal foreign objects, so it can detect ferromagnetic metals (iron, cobalt, nickel and alloys containing these metal impurities)

5. If the product cannot pass the inspection, it does not mean that it is not environmentally friendly.

It is correct to use the needle to detect the nickel content. If the product contains nickel, it is definitely not acceptable. However, many of our electroplated products may not pass the needle even if they do not contain nickel.

First of all, we first analyze several factors that the product can't pass the test:

1. There are broken needles in the clothes (especially the seams of the fabric, the overlap of the fabric or the thicker part of the fold).

2. Magnetic foreign matter (metal piece, metal scrap or wire, etc.) is mixed in the filling of the clothes.

3. The magnetic body is attached to the conveyor of the needle detector.

4. A large number of metal accessories (buttons, buttons, rivets, etc.) are installed on the clothes because even if the individual components meet the needle-detecting standards, the reaction values will increase if combined.

5, the printing on the clothes, the impact of the hanging tag, or forgetting to remove the bad logo, etc. will also cause the needle reaction.

6. When processing such as water washing, the metal impurities attached to some of the accompanying materials are attached to the clothes.

7. Through the above, we have already learned that as long as there is a magnetic metal in the electroplating product (that is, the iron-based metal in the periodic table), the needle can not be detected. We use white copper tin instead of nickel plating in electroplating. Nickel cobalt has no nickel instead of nickel. But cobalt is also iron-based metal. Even if cobalt can pass the EU RoHS certification, it can't pass the needle.

Sixth, finally

All of the above are due to external factors that cause the finished product to fail to pass the needle during the needle inspection. Therefore, the terminal finished product is not subject to inspection before the factory is a comprehensive factor, not only the plating process. Can not say that the needle is the plating process is not environmentally friendly.

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