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Color press

A printing press, color technology, applied in the direction of winding strip, thin material handling, transportation and packaging, etc., can solve the problems of inability to guarantee stable substrate tension and inaccurate overprinting.

Inactive Publication Date: 2017-07-18
天津市北辰区金达纸业纸品厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These guide rollers in the printing unit are passive rollers without power, which are transported by the substrate when it moves. The work of the guide rollers does not affect the stress change or length change of the substrate, and the tension of the substrate in the printing section cannot be guaranteed. , therefore, it will cause the substrate to stretch and change between each printing unit on the printing section, resulting in inaccurate overprinting

Method used

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Examples

Experimental program
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Embodiment 1

[0019] Figure 4 The color printing machine shown is mainly composed of the unwinding part A, the unwinding traction part B, the printing part C, the drying part D, the winding traction part E and the winding part F framed by double dotted lines. constitute. Wherein the unwinding part A, the unwinding traction part B, the drying part D, the winding traction part E and the winding part F are mostly related parts of an existing color printing machine.

[0020] Figure 5 The printing part C shown has 8 printing units, that is, printing units 2, 3, 4, 5, 7, 8, 9, and 10. The substrate is web 1, and on the traveling path of web 1, in A vacuum suction roller 12 is housed before the first printing unit 2, a vacuum suction roller 11 is housed after the last printing unit 10, and a vacuum suction roller 11 is also housed between the fourth printing unit 5 and the fifth printing unit 6. Vacuum adsorption rollers 6 , the structural principles and installation methods of these vacuum a...

Embodiment 2

[0025] A kind of color printing machine of this embodiment is compared with a kind of color printing machine of embodiment 1, except that the synchronous roller in front of the first printing unit is replaced by a pair of ordinary rollers that sandwich the two sides of the substrate Figure 5 Except the vacuum suction roller 12 in, other parts are identical with a kind of color printing machine of embodiment 1. This pair of ordinary rollers is also connected with the vacuum adsorption roller through pulleys and transmission belts. During operation, the linear speed of the roller surface is the same as that of other vacuum adsorption rollers.

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Abstract

The invention discloses a color press. Vacuum adsorption rollers of printed materials are arranged in front of the first printing unit and in rear of the last printing unit, a plurality of axially-arranged air suction ways are formed below the roller faces of the vacuum adsorption rollers, and a plurality of air suction holes communicating with the air suction ways below the roller faces are distributed on the roller faces; and air suction hoods used for being connected with outlets, passing through the portions, of the air suction ways in a butt joint mode and communicating with a vacuum suction machine are arranged on the positions, positively opposite to a fan section portions of printed material warp angles, on the end faces of the vacuum adsorption rollers, and driving wheels on roller shafts of the vacuum adsorption rollers are mutually connected through synchronous belt transmission. Compared with the prior art, the color press can solve the problem that borne tension of the printed materials in the printing stage is reduce or increased under the effect of printing parameter changing, so that overprinting misalignment is caused.

Description

technical field [0001] The invention relates to the technical field of printing machinery, in particular to a printing machine with a plurality of printing units and a material in the form of a roll as the printing raw material. Background technique [0002] A printing machine with multiple printing units requires precise alignment between the substrate and the printing plate roller during color separation overprinting to achieve the printing effect required by the design. If there are many such color separation overprinting units, multiple printing units The final overprinting has very high requirements on the accurate positioning of the substrate. When the roll-type printing material enters the printing process of the printing machine, the printing material has to undergo multi-stage tension control such as unwinding traction, rewinding traction, and winding. The tension of each section will change, and this tension change will directly cause the substrate. The change of ...

Claims

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Application Information

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IPC IPC(8): B65H20/12B65H27/00
CPCB65H20/12B65H27/00B65H2701/19B65H2801/03
Inventor 李子健
Owner 天津市北辰区金达纸业纸品厂(普通合伙)
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