With the vigorous development of the canning industry in China, more and more canners in recent years have moved their brains in the improvement of canned packaging technology according to the needs of consumers: color printing cans, easy-open lids, and necking cans. Two cans and so on, and the cannery will encounter many new problems and new problems when using these new packaging methods. Here are some of the highlights of using tinplate easy-open covers:
1, tinplate easy to open the lid is not "ordinary bottom cover plus a pull ring" so simple, it is for the ordinary bottom cover, it is a thorough technical progress, is a relatively high-tech products, do not underestimate it .
2, tinplate easy to open the lid itself has several well-known difficulties: After the engraved line, pull ring riveting, that should be able to easily open, but also resistant to high pressure sterilization; tank surface stretching at the end of the coating resistance to content Corrosion; reticle reticle cannot be rusted after pasteurization.
How to solve such difficulties?
A. The manufacturers of easy-open covers adopt imported large-tonnage punches (such as MINSTER), sophisticated molds (such as STI, DRT), quality control management of production processes, and quality of internal and external coatings.
B. The supporting empty cans and canneries pay enough attention to the easy-opening and reduce the damage to the easy-opening lid in the final stage.
3. When the empty or solid tank factory seals the lid easily, the sealing head must be specially made according to the lid type size of the manufacturer (or brand) you purchased. Do not use the pressure head of the ordinary bottom lid to seal the lid. Cover or with other manufacturers (or brands) indenter, this may appear in the pressure head will be easy to open the cover flattened, deformation, resulting in external cracking coating solution cracking and rust, serious will make the ring tip Top to engraved line, high temperature sterilization when the top broken line leaking tank or later leaking tank.
4. When sterilizing the easy-open lid of a solid tank factory, pay attention to the vacuum degree. Because the compressive strength of the easy-open lid is less than that of the common bottom lid (the general compressive strength of the easy lid is generally ≥2kg, and the compressive strength of the bottom lid is generally >4kg), if there is a problem with the degree of vacuum, it may cause sterilization and pressure. , easy to open the first deformation, explosion tank.
5, 4B2 and other vertical sealing machine capping device:
The easy-open lid has a pull ring on the lid surface. When the lid is sealed, some lid-sealing devices are used to seal the lid. The lid-off mechanism will hit the pull ring, causing the pull ring to subside, and severe damage to the easy-open lid. The capping device should be modified to reduce the outside diameter of the capping head so that the capping head does not touch the pull ring, or a buffer device is installed on the capping head to reduce the impact force of the capping head on the pull ring.
6. After the sterilizing in the solid tank factory, the techniques such as drying and drying shall be performed on the cover surface to reduce the effect of water traces on the appearance of the easy-open cover.
7, empty, solid tank factory in the purchase of easy to open the lid, we must first according to their canned contents, select the easy to open the inner coating of what coating.
Experts know that the different contents have different requirements for the resistance of the inner coating. The same inner coating has different meanings for the ordinary bottom cover and the easy-open cover. Because you have to pay attention to the easy-open cover with pull rivets. Stretching, with reticle, this stretch has very high requirements for resistance and ductility of the inner coating (higher than two-piece cans). If the inner rivet and the inner lining paint are seriously damaged, they can only be solved by the supplementary coating method. , But this is the next strategy. The integrity of the inner coating of the easy-opening cover is guaranteed by the coating and the mold (the domestic part of the easy-opening manufacturing enterprise adopts the manual coating or the electrophoresis coating, the former will bring other problems, Such as low efficiency, increased scratches on other parts, paint accumulation and other issues, while the latter uses the electrode principle to cover the abrasions, but only a thin layer, it is difficult to resist the corrosion of highly resistant content).
When you purchase the easy-open lid, you should explain the contents of the can to the manufacturer. Generally speaking, the salesperson will recommend suitable internal coatings for you based on the contents of your cans. You should pay attention to this recommendation and do not consider the cost issue. Ignore the quality, this will reduce a lot of trouble later!
The above points for the industry to explore!