CN210415894U

CN210415894U - Paper preheating device

Info

Publication number: CN210415894U
Application number: CN201920786827.8U
Authority: CN
Inventors: 刘胜贵; 王亚宁; 陈建德
Original assignee: Qujing Fupai Color Printing Co ltd
Current assignee: Qujing Fupai Color Printing Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-04-28
Anticipated expiration: 2029-05-29

Abstract

A paper preheating device comprises a paper feeding mechanism and a drying device; the paper feeding mechanism consists of an upper paper feeding roller and a lower paper feeding roller, the upper paper feeding roller and the lower paper feeding roller are fixedly arranged on corresponding parts of the printing machine through bearings at two ends, the sizes of the two paper feeding rollers are consistent, and the roller surfaces of the two rollers at the same side are positioned in the same vertical plane; the drying device is composed of an electric heater and a thermocouple which are arranged in a drying box, and an air outlet is arranged at one end of the drying box and is provided with a hot steam discharge pipe; rectangular slotted holes which are consistent in size and correspond up and down are formed in the top surface and the bottom surface of the drying box. Paper for printing passes through the device and is subjected to preheating treatment in the same environment temperature in the simulated printing process, and the shrinkage deformation degree of the paper is obviously reduced when the paper enters a printing color group for printing, so that the printing overprinting precision and the gold stamping overprinting precision are obviously improved. Thereby promote the printing quality of product, reduce the inspection degree of difficulty simultaneously, effectively improve the product qualification rate.

Description

Paper preheating device

Technical Field

The utility model relates to a paper preheating device.

Background

The existing paper packaging printed matter is more and more exquisite, and is multi-color superposition printing, printing overprinting and hot stamping overprinting which have higher requirements, the paper of the packaging product contains a proper amount of moisture, and the moisture content of different types of paper is different. The same paper manufacturers are different, the water content of paper is different, and the water content of the paper is changed after printing and drying, so that the paper is contracted and deformed, the overprinting of printed patterns is inaccurate, and the product quality is influenced. Therefore, the paper can be preheated in the same environmental temperature as that in printing before printing, so that the paper can be properly shrunk and deformed before printing, and then the shrinkage and deformation degree of the paper can be obviously reduced when the paper enters a printing color group for printing, so that the overprinting precision of printing and the overprinting precision of gold stamping can be greatly improved compared with the paper without preheating and dehydration treatment. The printing quality of the product can be improved, the inspection difficulty is reduced, and the product percent of pass is effectively improved.

Disclosure of Invention

The utility model aims at disclosing a paper preheating device to in solving processes such as above-mentioned printing overprinting, gilt overprinting, because of the paper shrink range is too big, printing overprinting precision, the gilt overprinting precision that leads to can not reach the problem of requirement.

Technical scheme

A paper preheating device comprises a paper feeding mechanism and a drying device; the paper feeding mechanism consists of an upper paper feeding roller and a lower paper feeding roller, the upper paper feeding roller and the lower paper feeding roller are fixedly arranged on corresponding parts of a corresponding printing machine through bearings at two ends, the sizes of the two paper feeding rollers are consistent, and the rollers at the same side of the two paper feeding rollers are positioned in the same vertical plane; the drying device adopts an electric heater and a thermocouple which are arranged in a drying box; an air outlet is arranged at one end of the drying box and is provided with a hot steam discharge pipe; rectangular slotted holes which are consistent in size and correspond up and down are formed in the top surface and the bottom surface of the drying box.

The middle lines of the rectangular slotted holes on the top surface and the bottom surface of the drying box are positioned in the vertical plane where the upper paper passing roller and the lower paper passing roller are positioned on the same side.

The paper preheating device is manufactured according to the mode, the same environment temperature in the printing process is set in the device, paper to be printed can be preheated at the same environment temperature in the simulated printing process after passing through the device, the paper is properly shrunk and deformed before printing, and then the shrinkage and deformation degree of the paper is obviously reduced when the paper enters a printing color group for printing, so that the printing overprinting precision and the gold stamping overprinting precision are obviously improved compared with the paper without preheating and dehydration treatment. Thereby promote the printing quality of product, reduce the inspection degree of difficulty simultaneously, effectively improve the product qualification rate.

Drawings

FIG. 1 is a schematic view showing a structure of a paper preheating apparatus.

Fig. 2 is a temperature control circuit of the drying box.

Detailed Description

The technical solution is further explained below as an embodiment with reference to the accompanying drawings.

Referring to fig. 1, the whole preheating device is installed between the first printing color group of the printing machine and the paper outlet of the unreeling machine, the upper paper passing roller 3 and the drying box 6 are installed at the paper outlet of the unreeling machine, the lower paper passing roller 10 is installed on the first printing color group of the printing machine, and the paper 4 comes out of the outlet of the unreeling machine and enters the drying box 6 through the upper paper passing roller 3.

The upper paper passing roller 3 is rotatably arranged at the paper outlet of an unreeling machine of the printing equipment through bearings 1 at two end parts of the upper paper passing roller; the whole paper passing roller is required to be in a horizontal state during installation. A drying box 6 is arranged below the upper paper feeding roller 3, and is fixedly connected to a side plate of the unreeling machine through four connecting pieces 2 with sliding groove holes arranged at the upper part and the lower part of the rear part of the box body by screws. And the rectangular slotted holes 5 on the top surface and the bottom surface of the drying box 6 and the roller surface of the upper paper passing roller 3 above are positioned in the same vertical plane, so that the paper 4 to be treated which is sent into the drying box 6 by the upper paper passing roller 3 passes through the hollow position of the rectangular slotted hole 5 in a vertical mode, and the periphery of the rectangular slotted hole 5 can not scratch the paper.

When the lower feed roller 10 is mounted on the first printing couple of the printing press through the lower bearings 9 at both ends, it is also required that the lower feed roller 10 be horizontal and the paper 4 passing through its roller surface be maintained in a vertical state, so as to ensure that the paper 4 passes through the drying box in a vertical manner with the rectangular slot 5 of the drying box 6 above and the upper feed roller 3.

The drying box 6 is provided with three electric heaters 11 and a thermocouple 8, the temperature is detected by the thermocouple 8, and the temperature in the drying box is controlled within a set range, so that the electric heaters can finish the drying and dehydration work of the paper 4 in the drying box. The high-temperature resistant hot steam discharge pipe 7 is used for discharging water-containing waste gas generated in the drying box in the paper drying process.

Referring to fig. 2, an electric heater 11 of the paper preheating treatment apparatus is installed in the drying box 6; three electric heating devices are arranged on the surface of the box body, so that the temperature emitted by the electric heater 11 is relatively uniformly distributed in the space of the drying box, and the temperature in the box is controlled between 50 ℃ and 80 ℃ by the thermocouple 8 arranged in the box. The equipment uses 220V alternating current; when the printing machine is started to produce, a power supply switch 14 of the drying box 6 needs to be connected, the power supply switch 14 uses a switch with an electric leakage protection function, the electric heater 11 after being powered on starts to work, the temperature rises gradually, when the temperature reaches a preset upper limit temperature, a thermocouple 8 switch is automatically disconnected, the electric heater stops working, the temperature in the drying box can gradually fall, when the temperature falls to a preset lower limit temperature, the thermocouple 8 switch is automatically closed, the electric heater starts to work again, and the temperature rises gradually. The temperature in the drying box is detected through the temperature control function of the thermocouple 8, the switch of the temperature controller is automatically controlled to be switched off or switched on, and then the electric heating pipe is controlled to work within a set temperature range. A circuit indicator light 13 is connected in parallel in the circuit, and a fuse 12 is connected in series, so that the safety of power utilization protection is improved.

The method of use is described below:

the upper paper feed roller 3 and the lower paper feed roller 10 are fixed in front of the first printing color group and adjusted to the horizontal position. The drying box 6 is installed between the upper paper passing roller and the lower paper passing roller, the paper 4 passes through the drying box 6 at the moment, the paper is tensioned, then the installation position of the drying box 6 is adjusted, the upper rectangular slotted hole 5 and the lower rectangular slotted hole 5 of the drying box 6 cannot be in contact with the paper 4 under the tensioning state of the paper, the paper is guaranteed to be in the center of the rectangular slotted hole 5, therefore, the paper cannot be scratched by the drying box under the working state, and the drying box is fixed by screws after the paper is adjusted. One end of a hot steam discharge pipe 7 is fixed on an air outlet of the drying box 6, and the other end is connected with the air outlet of the nearby printing color group drying box. After the above components are installed, a temperature control circuit is installed, a temperature controller, namely a thermocouple 8, is adjusted according to the temperature requirement of normal use, and the temperature in the drying box 6 is kept within a required range.

In such a way, the whole preheating device is installed, so that the paper enters the preheating box for drying treatment before printing, the paper is ensured to have minimum shrinkage deformation during printing, the printing overprinting is ensured to be accurate, and the printing quality of the product is improved.

Claims

1. A paper preheating device comprises a paper feeding mechanism and a drying device; the paper feeding mechanism is characterized by comprising an upper paper feeding roller (3) and a lower paper feeding roller (10), wherein the upper paper feeding roller and the lower paper feeding roller are fixedly arranged on corresponding parts of a printing machine through bearings at two ends, the sizes of the two paper feeding rollers are consistent, and the roller surfaces of the two paper feeding rollers at the same side are positioned in the same vertical plane; the drying device adopts an electric heater (11) and a thermocouple (8), the electric heater and the thermocouple are arranged in a drying box (6) to form the drying device, and an air outlet is arranged at one end of the drying box (6) and is provided with a hot steam discharge pipe (7); rectangular slotted holes (5) which are consistent in size and correspond up and down are formed in the top surface and the bottom surface of the drying box (6).

2. The paper preheating apparatus according to claim 1, wherein the longitudinal middle lines of the rectangular slots (5) on the top and bottom surfaces of the drying box (6) are in the vertical plane on the same side of the upper paper feed roller (3) and the lower paper feed roller (10).