Common problems of tinplate coffee pot printing

 Tinplate printing also utilizes the physical properties of water and ink repellence, and transfers the printing plate graphics to the tinplate through the blanket with the help of printing pressure, which belongs to the principle of lithographic offset printing. The printing process of tinplate usually includes coating, printing and other main steps (as shown below); coating and printing are the most important and the most prone to problems. This document is common to these two links. Failure analysis.

1. Failure analysis and solution in the coating process

The coating process of tinplate, that is, coating on the surface of tinplate is mainly divided into two methods: internal coating and external coating.The internal coating process can protect and extend the service life of tinplate, while the external coating process can improve the adsorption capacity of the surface of tinplate on the one hand. Making it suitable for printing on the other hand can improve the performance of tinplate in the subsequent process, which is beneficial to can making.

The common problems in the coating process are as follows.

(1) Dike

The cause is that some of the white butadiene coating on the edge of the receiving tray is not cleaned. When applying other coatings (such as varnish), the white butadiene that is not cleaned may drip onto the tinplate of the fruit and then pass through the rubber roller. Transfer this part of white butter to other tinplate to cause pollution between products

Treatment method: thoroughly clean the foreign waste grade of the receiving tray

(2) Throw material

Cause There is paint in the hollow barrier of the roller, which will be applied to the tinplate during high-speed operation

Treatment method Wipe off the paint in the gap of the roller

(3) With material

The reason is that the spatula did not put the paint on the bottom sweet and dry, which caused multiple paints to be printed on the surface of the tinplate.

Treatment method, adjust the strength of the scraper, assist the pressure of the scraper and wool blanket, or replace the thinner.

(4) Fisheye

  Causes The short-term policeman in the paint makes the paint untrue on the surface of the Mali Iron.

  The solution is to increase the weight of the inclined material appropriately within the range allowed by the process.

(5) Pock

Cause The mining iron is contaminated with oil stains and impurities during the processing process, which causes the coating to be poorly coated. The fundamental method to distinguish between "pitting" and "fisheye" is to turn the tinplate 180 during the coating process. The position of the "small dot" on the tinplate is the same as the pit, otherwise it is fisheye. Generally speaking, the position of the "dot" on the tinplate is relatively national and the position of the fisheye is relatively random.

The solution, you can first carry out the need for flooding and then adjust the baking temperature to 180 degrees.

(6) Needle eye

The cause, the pressure of the rolling dealer is too small, the center of gravity of the inclined film is low, and the viscosity of the coating is low

The solution is to increase the pressure of the roller to increase the waist weight and the viscosity of the paint.

(7) Walking

Cause The pressure of the two push heads is uneven.

Solution, adjust the pressure and rules of the pusher.

(8) Brushed

The cause is that the synchronization of the Huatieliang is not adjusted, which causes the tinplate surface to be scratched by the Huatieliang.

Solution, adjust the synchronization of the iron beam,

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