CN111558513A - Process for coating milk powder tin printing plate - Google Patents

Abstract

The invention discloses a coating process for a milk powder tin printing machine, which comprises the following steps that (1) a glazing rubber roller is changed into a rubber roller which is horizontally and vertically empty, and a transverse slot extending in the height direction of a rubber roller cylinder is additionally arranged on the glazing rubber roller, namely, the coating process of glazing the rubber roller which is horizontally and vertically empty is adopted; and (2) calculating, namely, a plate making documentation process taking the shrinkage of the color printing pattern at the flanging position of the tank body as a core. And (3) optimizing the component proportion of the gloss oil, distinguishing the winter gloss oil from the summer gloss oil according to the temperature difference in northern areas, and strictly controlling the viscosity of the gloss oil. Quality benefit: the scratch of the tank mouth is reduced, the foreign matter risk is reduced, the product quality is improved, and the customer complaints are reduced; and (4) managing income: the time for stopping and cleaning the die and the maintenance time are reduced in the tank making process, and the production efficiency is improved. 3. Raw material saving: because the areas of light feeding and color printing are reduced, the use amount of raw materials in production can be saved.

Description

Process for coating milk powder tin printing plate

Technical Field

The invention relates to a milk powder can, in particular to a process for coating iron on a milk powder can.

Background

The most important devices for printing milk powder cans are a coating machine (coating process) and an iron printing machine (color printing process), and the coating process mainly serves as preparation work before color printing and surface treatment work after printing. The printing material is tinplate, the tinplate is silver-gray metal material, the main coating work before color printing is white porcelain and base oil coating, the gas drying room is carried out for drying (160-180 ℃) after the pretreatment is finished, and the color printing is carried out after the drying. After all color overprinting is finished, a layer of gloss oil or pearly-lustre oil is required to be covered on the surface of the metal printing plate (surface treatment after printing in a coating process) so as to increase the glossiness of the surface of a printed product, improve the hardness of the product, increase the scratch resistance and enable the printing ink on the printed product to have certain flexibility and corrosion resistance. When the polishing machine is used for polishing, the polishing oil is uniformly coated on the rubber roller through the matching action of the material guide roller, the pressure roller and the rubber roller of the polishing machine, and then the polishing oil on the rubber roller is coated on the tinplate through the rotation of the equipment. The existing rubber roller is a vertical hollow rubber roller. The hollow rubber covered roller is vertically grooved on the basis of the smooth rubber covered roller, and the grooving direction is that the middle and two ends of the rubber covered roller cylinder are grooved in a looping manner along the circumferential direction.

The prior art has some problems.

First, in the traditional milk powder jar type product of current milk powder jar, can body turn-ups position when transporting the front end of customer canning transfer chain, the condition of turn-ups position color printing face scraped the pattern often appears, and printing ink falls into milk powder jar inner wall and can cause the foreign matter problem.

Secondly, in the traditional milk powder can product, all the printed color printing surfaces can be coated with a layer of 6-8g/m due to the requirement of the printing process²The gloss oil is cut into small pieces, and then the cut pieces enter the tank making process to be turned up and down to form a rolled opening, so that transparent powder or transparent filaments are generated at the tank opening and easily fall into the inner wall of the tank to cause the generation of foreign matters. The detection shows that the transparent powder or the transparent filament is produced by peeling the cut part of the tinplate after the varnish is dried and solidified.

Thirdly, in the necking flanging process of the necking can product, because two times of curling and stretching processes are carried out in the necking process, the strength of the can body is large, so that gloss oil silk or powder at the can opening is remained and accumulated in the die, and the gloss oil silk can be melted by heat generated by pressure in the necking process to generate denaturation, and a caking with high hardness is generated after carbonization. The substance adheres in the mould and up to a certain size can cause craters or damage to the mouth of the can and agglomerates can fall into the can at any time during operation of the apparatus causing foreign matter.

Fourthly, the existing coating process is fixed, which does not meet the actual situation that the temperature difference of north winter and summer systems is large, the viscosity of the coating is greatly different in winter and summer, and the quality problems of shrinkage cavity and the like are often generated according to the existing fixed coating process.

Disclosure of Invention

The invention aims to overcome the technical defects and provide a process for coating a tin can with milk powder.

In order to solve the technical problems, the technical scheme provided by the invention is that the coating process of the milk powder tin printing comprises the following steps:

step (1), the glazing rubber roller is changed into a vertical and horizontal hollow rubber roller, and the glazing rubber roller is additionally provided with a transverse slot along the height direction of the rubber roller cylinder, namely, a coating process of glazing the rubber roller by vertically and horizontally keeping the hollow rubber roller;

and (2) calculating, namely, a plate making documentation process taking the shrinkage of the color printing pattern at the flanging position of the tank body as a core.

And (3) optimizing the component proportion of the gloss oil, distinguishing the winter gloss oil from the summer gloss oil according to the temperature difference in northern areas, and strictly controlling the viscosity of the gloss oil.

Compared with the prior art, the invention has the advantages that: quality benefit: the scratch of the tank mouth is reduced, the foreign matter risk is reduced, the product quality is improved, and the customer complaints are reduced; and (4) managing income: the time for stopping and cleaning the die and the maintenance time are reduced in the tank making process, and the production efficiency is improved. 3. Raw material saving: because the areas of light feeding and color printing are reduced, the use amount of raw materials in production can be saved.

Drawings

FIG. 1 is a schematic structural diagram of a milk powder tin can coating process before improvement.

FIG. 2 is a schematic diagram of an improved structure of a coating process of a powdered milk tin printing machine.

Detailed Description

The process for coating the iron can with milk powder according to the present invention will be described in detail with reference to the accompanying drawings.

A milk powder can tin printing coating process, step (1), the glazing rubber roll is changed into and is set aside empty anyhow, the glazing rubber roll has increased and extended the horizontal fluting of the cylinder height direction of the rubber roll, namely through setting aside the coating process that the rubber roll polishes anyhow;

and (2) calculating, namely, a plate making documentation process taking the shrinkage of the color printing pattern at the flanging position of the tank body as a core.

And (3) optimizing the component proportion of the gloss oil, distinguishing the winter gloss oil from the summer gloss oil according to the temperature difference in northern areas, and strictly controlling the viscosity of the gloss oil.

Quality benefit: the scratch of the tank mouth is reduced, the foreign matter risk is reduced, the product quality is improved, and the customer complaints are reduced; and (4) managing income: the time for stopping and cleaning the die and the maintenance time are reduced in the tank making process, and the production efficiency is improved. 3. Raw material saving: because the areas of light feeding and color printing are reduced, the use amount of raw materials in production can be saved.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (1)

1. A process for coating a tin-printing plate on a milk powder can is characterized by comprising the following steps:

step (1), the glazing rubber roller is changed into a vertical and horizontal hollow rubber roller, and the glazing rubber roller is additionally provided with a transverse slot along the height direction of the rubber roller cylinder, namely, a coating process of glazing the rubber roller by vertically and horizontally keeping the hollow rubber roller;

and (2) calculating, namely, a plate making documentation process taking the shrinkage of the color printing pattern at the flanging position of the tank body as a core.

And (3) optimizing the component proportion of the gloss oil, distinguishing the winter gloss oil from the summer gloss oil according to the temperature difference in northern areas, and strictly controlling the viscosity of the gloss oil.

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