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Passivation process of tinplate: In order to stabilize the surface state of tinplate, prevent the increase of oxidized tin formed on the surface, after electrolytic plating, the tinplate coil must undergo a process with electrized or not electrized chemical solvent, which is called passivation process. Except otherwise agreed with customers, cathode passivation process with Na2Cr2O7 solvent is used.
The oil commonly used is DOS. The weight of the coil generally ranges from 6 tons to 12 tons per coil. The inner diameter of the coil can be either mm, mm or mm. The delivery weight of the coil is theoretically calculated. There is normally a small part of the coil that is not in accordance with the standard of first class product and can not be separated due to continuous production.
So it is regulated by national standards that this small part of the coil shall not exceed 10 percent of the total weight of the coil.
The delivery weight of tinplate, tin free steel in sheet form is also theoretically calculated. For those products planned to be used in a short period and have lower requirement for moisture resistance, simple water-proof packing is used. For those products requiring long-distance transfer and having high requirement for moisture resistance, a steel box packing shall be added.
All rights reserved. Share on: Facebook Twitter Pinterest. Related Products. Model No. Total 26 Related Items. Product Description. The common knowledge of tinplate, 1. What is tinplate? It combines the strength and forming ability of steel with anti-corrosiveness, soldering ability and beautiful appearance of tin.
Because of its special characters such as anti-corrosiveness, poison-less, high strength and good lengthening ability it is extensively used as packing material for food, beverage, oil, chemicals, coats, paints sprays, crowns and many other daily articles.
What is tin free steel? It is a new kind of metal packing material invented to save cost and tin whose resource is limited and very precious and expensive.
Comparing with tinplate, tin free steel is cheaper and has better adhesion for coating and painting, but it is not as good as tinplate in anti-corrosiveness and surface appearance. In addition, for the time being, it can only be welded by resistance welding or joining, but can not be welded with solder tin.
Now it is mostly used for crowns and cans for storing light-acid foods. Its range of usage keeps on extending in present years. Tin free steel is still a new product in China. The national standard for tin free steel has not been setup yet. Tinplate encyclopedia The first tin made of tinplate used to contain and preserve food from decay was invented by British in Since s the need for tin and manufacturing of tin have been developing continuously and quickly.
Tins were hand-made until the American invented the first tin making machine. The invention of electric welder greatly increased the efficiency of tin making.
Tin free steel appeared in the middle of 20th century to partially replace the use of tinplate. Steel type of tinplate Normally there are three steel types, refer to form 1. Form 1 The chemical composition of steel base Type. Nominal value. Average scope. Remark: Tinplate with special coating weight other than above mentioned can be provided according to agreement. Tinplate made by this process is essentially a sandwich in which the central core is strip steel.
This core is cleaned in a pickling solution and then fed through tanks containing electrolyte, where tin is deposited on both sides. As the strip passes between high-frequency electric induction coils, it is heated so that the tin coating melts and flows to form a lustrous coat.
Electrolytic Tinplate ETP is a thin, cold-rolled carbon steel sheet coated with tin. The steel substrate provides the necessary strength and formability for specialty fabrication. The alloy layer provides the bond between the steel and free tin layer. The free tin layer is not only responsible for the attractive bright finish and ease of solderability but is also non-toxic, a factor of vital importance in food packaging.
The special properties of tinplate and improved manufacturing technology is allowing for the utilization of tinplate in many new end products. Powered by DIYTrade.
Prime electrical tinplate: Thickness: 0. Tin-Plate Prime electrical tinplate: Thickness: 0. Tin coating weight Type Designation of tin coating weight Min. Stone finish 0. Silver finish 0. Matte finish 0.
JIS G3303 Food Grade T3 ETP Electrolytic Tinplate
Passivation process of tinplate: In order to stabilize the surface state of tinplate, prevent the increase of oxidized tin formed on the surface, after electrolytic plating, the tinplate coil must undergo a process with electrized or not electrized chemical solvent, which is called passivation process. Except otherwise agreed with customers, cathode passivation process with Na2Cr2O7 solvent is used. The oil commonly used is DOS. The weight of the coil generally ranges from 6 tons to 12 tons per coil. The inner diameter of the coil can be either mm, mm or mm. The delivery weight of the coil is theoretically calculated.
jis g3303 standard
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