KR920007942B1 - Apparatus for calendering sheet paper - Google Patents

Abstract

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Description

Device to polish paper sheets

1 is a block diagram showing an outline of a provision of a device for polishing a sheet paper according to the present invention.

2 is an overall side view showing one embodiment of an apparatus for polishing a paper sheet according to the present invention.

3 is a schematic view of the main and thermal fluid supply.

* Explanation of symbols for the main parts of the drawings

12: paper feed stand 14: endless belt

16: rollers 18: mainly rollers

26: cooling chamber 28: water cooling shower

34: paper discharge support 44: drive device

46: Chain 48: Joint

50: boiler 52: pump

54: hydraulic 56: handle

58: delivery roller 60, 62: guide roller

64: return belt

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for polishing a sheet of paper coated with a synthetic resin, and more particularly, to a device for polishing a paper sheet by a cold water shower and mainly for distributing a thermal fluid therein for heat melting and cooling. It is about.

The surface of the printed paper sheet is often polished to give a beautiful and luxurious finish.

This gloss processing is to melt and melt a synthetic resin coating such as vinyl chloride coated on the surface of the paper sheet once, and then rapidly cool to give the synthetic resin coating surface taut and glossy.

Therefore, in order to improve the glossiness processing in this way, processing must be performed while managing the amount of heat applied to the synthetic resin coating and the amount of heat taken therefrom in the heating and melting step and the cooling step.

Conventionally, a far infrared-ray heater was wired inside a main roller which is a pair of pressure rollers to heat-melt a synthetic resin coating and a paper sheet, thereby making it a heat source.

However, since the temperature of the far-infrared heater itself increases by several hundred degrees, it is necessary to sufficiently control the exothermic temperature in order to adjust the surface temperature of the main roller.

Otherwise, the printing ink or the synthetic resin coating may be deteriorated by high temperature.

In addition, such a heating device using a far-infrared heater is difficult to quickly adjust the temperature to a suitable temperature for the polishing process.

The reason is that even if the circuit of the far-infrared heater in the main roller is cut off, the heat accumulated in the main roller is released instantaneously and is released only after a period of time without cooling.

Therefore, there is a defect in the product due to the time difference until the main roller is lowered to the proper temperature.

It is also impossible to evenly distribute the far-infrared heater in the main roller.

The heat distribution on the surface of the main roller is unbalanced, which also causes product defects. For example, even if the thickness of the main roller is thickened to uniformize the heat distribution of the main roller, it is difficult to quickly set the temperature of the main roller at this time.

In addition, the far infrared heater requires more than a few tens of kilowatts of power, which in turn requires extensive equipment due to the electrical insulation of the rotating main roller, which inevitably incurs high power and maintenance costs.

On the other hand, some conventional cooling apparatuses were to blow compressed air with a blower.

However, such a cooling device not only requires a large sized equipment, but also causes noise.

As a result, the conventional polisher was not equipped with rapid heating and cooling cycles, and was a large-scale facility that did not have a uniform heat distribution and required a preheating chamber.

It is therefore an important object of the present invention to obtain an improved apparatus for polishing paper sheets.

Another object of the present invention is to obtain an apparatus for polishing a paper sheet which can be subjected to strict thermal management and further capable of quick gloss processing.

It is still another object of the present invention to obtain an apparatus for polishing a paper sheet having a simple configuration and miniaturization.

In order to achieve these objects, the apparatus for polishing the paper sheet of the present invention is installed on the pedestal side for supplying paper, rotated by a drive device, and has a cavity for distributing heat fluid therein, and heat conduction from the heat fluid. A main roller for heating the endless belt by means of; A heat fluid transport means for supplying heat fluid to the main roller; A metal belt having a polished surface, comprising: an endless belt wound between the main roller and a feeding roller on a pedestal side for discharging paper; An apparatus for polishing a sheet of paper having a pressure roller for contacting the main roller to be pressure-controlled through the endless belt; A cooling chamber is provided close to the main roller and surrounds the endless belt, and cooling water is sprayed on the inner surface of the endless belt running through the cooling chamber to continuously maintain the quenching state of the endless belt. And a water-cooled shower for fixing the glossy surface.

Further objects and the like of the present invention will become apparent from the following description with reference to the drawings.

However, such a thing merely shows an embodiment of the present invention, and the present invention is not necessarily limited thereto.

First, with reference to drawings, the outline | summary of the processing process by the paper sheet glossiness apparatus which concerns on this invention is demonstrated. The paper sheet coated with the synthetic resin on the surface is sandwiched between the endless belt 14 and the pressure roller 16 from the pedestal 12 for supplying paper in the process indicated by reference numeral 10 '.

The endless belt 14 is mainly wound around the belt 18 and heated by a heat fluid supply device.

The paper sheet coated with the synthetic resin is heated and melted in cooperation with the pressure roller 16 in the step indicated by reference numeral 20 '.

Reference numeral 22 denotes a pressurization step by the pressure roller. The paper sheet heated to a temperature of 100 ° C. or less is transferred integrally with the endless belt 14 to the next cooling process 24.

This cooling step 24 is performed by the water-cooling shower 28 while the endless belt 14 is moving in the cooling chamber 26, and this cooling action is transmitted to the paper sheet.

And the paper sheet is peeled off from the endless belt 14 in the process 30, and is finally piled up on the paper discharge base 34 in the process 32. As shown in FIG.

Reference numerals # 36 'and # 38' denote heat transfer steps for heating and cooling by the endless belt 14, and the endless belt 14 periodically repeats the heating step 36 and the cooling step 38 of these.

Reference numeral 40 denotes a heating step of the endless belt 14 by the main roller 18, and 42 denotes a cooling step of the endless belt 14 by the water cooling shower 28, respectively.

Next, with reference to FIG. 2 and FIG. 3, the apparatus which polishes the paper sheet which concerns on this invention is demonstrated.

Numeral 18 denotes a main roller for heating the endless belt 14, and the main roller 18 is installed on the side of the paper feed support 12, and is connected to the chain by a drive device 44 such as a continuously variable motor. Rotate through 46).

The main roller 18 is a thin, high-quality painted casting, and furthermore, the surface is hard chromium plated and the surface is mirror-finished.

Since the interior of the main roller 18 was dug to a uniform thickness as simply shown in FIG. 3, a thermal fluid is induced in the cavity 48. Such thermal fluids include steam or heated oil.

In the embodiment of FIG. 3, the water vapor is heat fluid in particular, and the water vapor generated by the boiler 50 constituting the heat fluid supply device is supplied to the cavity 48 in the main roller 18 by the pump 52. .

The main roller 18 is heated and then returned to the boiler 50 so as to circulate.

In describing the advantage of using water vapor as a thermal fluid, the water vapor rises only to 120-130 ° C. unless it becomes superheated steam, and thus it is transmitted to the paper sheet and the resin coating regardless of the rotational speed of the main roller 18. Temperature is 100 degrees C or less.

This makes it possible to perform homogeneous gloss processing without deteriorating the printing ink or coating. It is more convenient to introduce water vapor having good thermal efficiency into the cavity 48 of the main roller 18, so that the entire inner and outer surfaces of the main roller 18 can be kept at a uniform temperature and a spotless heat distribution can be realized. In addition, the temperature control of the outer surface of the main roller 18 can be quickly brought to an appropriate temperature by changing the vapor pressure.

In addition, the steam pressure satisfies up to about 5Kg / ㎠, and also the boiler 50 is good as a conventional distillation boiler and the fuel cost is low. In the case of using oil such as mineral oil as the thermal fluid, the circumstances are almost the same, and the main roller 18 can be appropriately heated by selecting the type of oil after considering specific heat, thermal conductivity or durability.

By adjusting the outer surface temperature of the main roller 18 in this manner, the synthetic resin coating applied to the surface of the paper sheet in advance can be melted uniformly and brought into close contact with the surface of the endless belt 14.

The pressure roller 16 is in contact with the main roller 18 so that the pressure can be adjusted through the endless belt 14. The pressure roller 16 is a metal roller coated with synthetic rubber and is supported to be able to move up and down in the same direction as the axial direction of the main roller 18.

＂54＂ is a hydraulic pressure regulator for adjusting the pressure at which the pressure roller 16 contacts the main roller 18, and moves the pressure roller 16 to the main roller 18 by moving the handle 56 of the hydraulic pressure cylinder 54. Apply contact pressure evenly toward.

＂58＂ denotes a delivery roller, and the delivery roller 58 is provided symmetrically with the main roller 18 on the paper discharge pedestal 34 side, and these main rollers 18 and the delivery roller 58 An endless belt 14 is wound therebetween.

The endless belt 14 is a steel belt whose surface is wiped off, and its role is to heat-melt the paper sheet and the coating first, and then rapidly cool and polish the paper sheet while the synthetic resin coating of the paper sheet is brought into close contact with each other. The paper sheet is peeled off in the vicinity of the discharge pedestal 34.

In other words, the endless belt 14 is a conveying device for the paper sheet, a heat conduction device, and an element for automatically operating the polishing device.

In this way, the endless belt 14 is wound between the main roller 18 and the delivery roller 58 and rotated, but is heated by the main roller 18 and immediately enters the cooling chamber 26.

That is, the cooling chamber 26 is a compartment installed in the vicinity of the main roller 18, and surrounds the endless belt 14 to be moved.

In the cooling chamber 26, several water-cooled showers 28 are installed, and the endless belts 14 are quenched by spinning coolant from the waterproof openings of the water-cooled showers 28 to the inner surface of the endless belts 14, whereby The heat-melted paper sheet and its synthetic resin coating are quenched to solidify and mirror to give gloss.

In addition, even if a water curtain wall (Water curtain wall) is provided in place of the water-cooled shower (28), it is possible to deodorize the heat of the endless belt (14).

The cooling water radiated from the water cooling shower 28 is discharged out of the apparatus through a passage not shown after hitting the inner surface of the endless belt 14. Of course, the used cooling water can be reused by filtration cooling again. The filtering device, the pump, and the like are well known, and thus detailed description thereof will be omitted.

“60” and “62” are guide rollers for installing endless belts. In addition, # 64 "denotes a conveyance belt, and since the rapidly cooled paper sheet is peeled off from the endless belt 14, it receives it and sends it to the paper discharge support 34. As shown in FIG.

Furthermore, the endless belt 14 via the delivery roller 58 is returned to the main roller 18 side again without passing through the preheating chamber as before.

As described above, according to the polishing apparatus for the paper sheet according to the present invention, since the endless belt is heated by circulating a heat fluid such as water vapor in the main roller, the temperature of the heat fluid does not exceed about 120 ° C. The temperature of can be made 100 degrees C or less.

Therefore, there is no accident such as altering the printing ink or coating resin. In addition, the temperature distribution of the main roller is completely uniform, and therefore, good glossiness can be obtained without any stains caused by heating.

In addition, since the cooling water is radiated to the inner surface of the endless belt to quench the cooling, noise can be produced and the coating of the resin can be solidified rapidly. Thus, the work efficiency of the polishing process can be improved and a beautiful polished surface can be obtained.

In addition, since the preheating chamber does not need to be installed, the size of the device can be greatly reduced.

The present invention is capable of various other modifications and is not limited to the illustrated and described.

Claims (1)

A main roller installed at the paper feed support side and rotated by the driving means, having a cavity for distributing thermal fluid therein, and heating the endless belt by conduction heat from the thermal fluid; A heat fluid supply device for supplying heat fluid mainly to the roller, and an endless belt wound between the main roller and the feed roller on the paper discharge support side as a metal belt having a polished surface; An apparatus for polishing a sheet of paper having both rollers in contact with the main roller so as to adjust pressure through the endless belt; A cooling chamber installed near the main roller and surrounding the endless belt, and radiating cooling water to the inner surface of the endless belt running through the cooling chamber to quench the state of the endless belt. An apparatus for polishing a paper sheet, comprising: a water-cooled shower for continuously holding and fixing a glossy surface.

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