CN1464135A

CN1464135A - Wet returning device and method for coating machine

Info

Publication number: CN1464135A
Application number: CN 02121138
Authority: CN
Inventors: 吴图壮
Original assignee: SHANTOU CITY JINTONG INDUSTRIAL Co Ltd
Current assignee: SHANTOU CITY JINTONG INDUSTRIAL Co Ltd
Priority date: 2002-06-10
Filing date: 2002-06-10
Publication date: 2003-12-31
Anticipated expiration: 2022-06-10
Also published as: CN1258028C

Abstract

The present invention relates to one kind of rewetting mechanism for painting machine and its rewetting method. The naturally rewetting mechanism is set downstream the humidity regulating vapor mechanism and heating and flattening mechanism, and has natural space communicated with atmosphere at least between the upper frame supporting roller and the lower frame supporting roller. Painted paper-base product after being heated and flattened is made to enter to the natural space of the rewetting mechanism for balanced exchange between the paper moisture and atmosphere. Compared with available technology, the present invention can avoid paper deformation and ensure the high quality of the painted product.

Description

Coating machine goes back to wet mechanism and returns wet method

Technical field

The present invention relates to a kind of coating machine and go back to wet mechanism naturally and return wet method, it is specially adapted to the coating of vacuum aluminium-plated paper.

Background technology

The coated article that with the paper is substrate needs to dry after coating, thereby make the moisture of paper reduce, reduce to below 3% from 4.8-7.2% (the paper type different moisture content is also different) as paper moisture in the drying course after the vacuum aluminium-plated paper coating, so must be wet to returning after the paper coating oven dry, make the water vapour pressure in the paper reach the poised state that equates with airborne water vapour pressure, otherwise paper fragile easily broken broken, and produce curl, raised grain or fold, have a strong impact on product quality.Conventional paper damping method is with the quantitative dewing of anilox roll or use the steam dewing on equipment, yet, because of the humidity difference of the South and the North, humidity difference even the humidity difference of morning, noon and afternoon within one day between every day, in fact this conventional damping method with artificial experience is difficult to paper is carried out accurate humidity control, and too high or too low paper distortion, the curling or fold of all can making of the moisture of paper can not guarantee product quality.This phenomenon is an insurmountable always difficult problem, thereby has restricted the development of environmental protection packaging material.

The content of invention

Purpose of the present invention is exactly the above-mentioned deficiency that overcomes prior art, provides a kind of coating machine to return wet mechanism and time wet method, makes the moisture content in the applied paper reach the poised state that equates with airborne water moisture content, guarantees product quality.

Coating machine of the present invention goes back to wet mechanism, it comprises steam damping mechanism and the hot-press structure after this steam damping mechanism, be provided with nature in the described downstream that flattens mechanism and go back to wet mechanism, it comprises upper frame and underframe, alternate respectively several backing rolls that is provided with on upper frame and underframe, and this returns the wet mechanism place for communicating with atmosphere between upper frame supports roller and underframe backing roll at least naturally.

Coating machine of the present invention returns wet method and comprises the steps: that the paper substrate coated article after (1) is to the coating oven dry carries out the steam damping; (2) the paper substrate coated article after the steam damping is heated pressing; (3) to the paper substrate coated article after flattening with place that atmosphere communicates in carry out nature and return wetly, the moisture in the paper and the humidity of surrounding air are balanced each other.

The present invention makes the paper coated article after the steam pressure damping be exposed to place, paper contacts with atmosphere, absorb airborne moisture content or in air, discharge moisture content, and reach the relative equilibrium of paper institute's water content and atmospheric humidity (moisture content), prevent paper distortion, thereby guaranteed the quality of coated article.

Describe the content of invention with reference to the accompanying drawings in detail with embodiment.

Description of drawings

Fig. 1 is the schematic diagram that coating machine of the present invention goes back to wet mechanism.

Each label is represented in the accompanying drawing: 1 steam damping mechanism, and 2 paper substrate coated articles, 3 warm-up mills, 4 chill rolls, 5 go back to wet mechanism naturally, 7 upper frames, 8 backing rolls, 9 unsteady jockey pulleys, 10 underframes, 11 backing rolls.

The specific embodiment

As shown in the figure, coating machine of the present invention goes back to wet mechanism, it comprises steam damping mechanism 1 and the hot-press structure 3 after this steam damping mechanism 1, be provided with nature in the described downstream that flattens mechanism and go back to wet mechanism 5, it comprises upper frame 7 and underframe 10, alternate respectively

several backing rolls

8,11 that is provided with on upper frame 7 and underframe 10, and this returns wet mechanism 5 place for communicating with atmosphere between upper frame supports roller 8 and underframe backing roll 11 at least naturally.In the accompanying drawings, the backing roll on the upper frame 7 is 4, and the backing roll on the underframe is 5, certainly, can reach actual conditions (as the size of required time wet distance) as required and determine the quantity of the backing roll of framework up and down.

Coating machine of the present invention returns wet method, comprises the steps: that the paper substrate coated article 2 after (1) is to the coating oven dry carries out the steam damping in steam damping mechanism 1; (2) the paper substrate coated article after the steam damping 2 is flattened by hot-press structure 3; (3) to the paper substrate coated article 2 after flattening with place that atmosphere communicates in carry out nature and return wetly, the moisture in the paper and the humidity of surrounding air are balanced each other.

Because of paper is the extremely strong hydrophilic substance of polarity, water there is extremely strong suction-operated, so at the paper of coated article by above-mentioned place the time, can carry out effective water balance exchange with atmosphere, and the water content of paper can change with the variation of surrounding air relative humidity, thereby can effectively prevent Deformation of Paper, guarantee the quality of coated article.

Return at above-mentioned coating machine on the basis of wet mechanism, the present invention can have following modification:

1, describedly goes back to wet mechanism 5 naturally and be provided with and have an automatic tension-adjusting device 9 at least.Naturally returning in the wet process, paper absorbs or discharges moisture content, causes the tension force of paper to change, and the purpose of the jockey pulley 9 that floats is exactly the tension force that is used for adjusting automatically or control paper.

2, described automatic tension-adjusting device 9 can be a unsteady jockey pulley.This unsteady jockey pulley can be controlled by spring, and is simple in structure.

3, described unsteady jockey pulley 9 can be used as one of described several backing rolls 8,11.The paper tension controlled adjuster of float jockey pulley or other form can certainly be set, as forming the complete unsteady tension system of a cover in other suitable position separately by configurations such as department's clothes motor and high accuracy cylinders.

4, described hot-press structure 3 can be a warm-up mill, is provided with chill roll 4 between described hot-press structure 3 and time wet mechanism 5.This chill roll can make paper cooling, and with environment facies with temperature under enter the balanced exchange that place and atmosphere carry out moisture content, can carry out process control better.

5, described upper frame 7, underframe 10 and on

backing roll

8,11 preferably so be provided with, be 30-50m even applied paper passes the distance of described place, this distance is different with the difference of paper type and moisture thereof.Paper substrate coated article after flattening enters nature and goes back to wet space, walks around each

backing roll

8,10, and the backing roll of walking around is many more or paper is long more in the distance that place passes through, and its water balance with atmosphere exchanges abundant more.Test shows that for reaching the purpose of water balance exchange, paper preferably is not less than 30m in the distance that place passes through.Consider the volume of equipment or the restriction in place, paper is advisable at 30-50m by the distance of place.

Return in the invention described above on the basis of wet method, can also have following modification:

1, this method also is included in nature and returns in the wet process returning the step of the automatic adjustment of tonicity of coated article that wets naturally.

2, time wet distance of described paper substrate coated article in place is 30-50m.Consider the restriction in instrument size or place, the wet distance of this time is both economical scope.

3, flatten step (2) and return the step that can also comprise between the wet step (3) that the coated article to pressing cools off naturally in described heating.This cooling step can make paper with environment facies with temperature under carry out the balanced exchange of moisture content with atmosphere, can carry out process control better.

Coated article promptly can rolling after returning naturally and wetting.

The invention solves the insurmountable so far difficult problem of paper coating both at home and abroad, guaranteed the balance moisture content of paper and the flatness of product, particularly the present invention natural environment effectively applicable to different humidity.

Above-mentioned just illustrative to the description of invention with reference to embodiment, and do not constitute qualification to it.Obviously, on basis of the present invention, can carry out many modification or improvement, but not break away from the scope that its essence and its claim are protected.

Claims

1, a kind of coating machine goes back to wet mechanism, it comprises steam damping mechanism (1) and at this steam damping mechanism (1) hot-press structure (3) afterwards, it is characterized in that, be provided with nature in the described downstream that flattens mechanism and go back to wet mechanism (5), it comprises upper frame (7) and underframe (10), alternate respectively several backing rolls (8,11) that are provided with on upper frame (7) and underframe (10), and this returns wet mechanism (5) place for communicating with atmosphere between upper frame supports roller (8) and underframe backing roll (11) at least naturally.

2, coating machine according to claim 1 goes back to wet mechanism, it is characterized in that, describedly goes back to wet mechanism (5) naturally and is provided with and has an automatic tension-adjusting device (9) at least.

3, coating machine according to claim 2 goes back to wet mechanism, it is characterized in that described automatic tension-adjusting device is a unsteady jockey pulley (9).

4, coating machine according to claim 3 goes back to wet mechanism, it is characterized in that described unsteady jockey pulley (9) is as one of described several backing rolls (8,11).

5, go back to wet mechanism according to the described coating machine of one of claim 1-4, it is characterized in that, between described hot-press structure (3) and time wet mechanism (5), be provided with chill roll (4), and described hot-press structure (3) is a warm-up mill.

6, go back to wet mechanism according to the described coating machine of one of claim 1-4, it is characterized in that, described upper frame (7), underframe (10) and on backing roll (11) so be provided with, be at least 30-50m even applied paper passes the distance of described place.

7, a kind of coating machine returns wet method, comprises the steps: that the paper substrate coated article after (1) is to the coating oven dry carries out the steam damping; (2) the paper substrate coated article after the steam damping is heated pressing; (3) to the paper substrate coated article after flattening with place that atmosphere communicates in carry out nature and return wetly, the moisture in the paper and the humidity of surrounding air are balanced each other.

8, coating machine according to claim 7 goes back to wet mechanism, it is characterized in that, this method also is included in nature and returns in the wet process returning the step of the wet automatic adjustment of tonicity of coated article naturally.

9, return wet method according to claim 7 or 8 described coating machines, it is characterized in that, the return wet distance of described paper substrate coated article in place is at least 30-50m.

10, return wet method according to claim 7 or 8 described coating machines, it is characterized in that, flatten step (2) and return naturally between the wet step (3) in described heating and also comprise the step that the coated article after the steam damping is cooled off.