JPS639600Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paper surface polishing device that makes it possible to partially polish a paper surface through a series of steps.

When making cans by pasting together the edges of paper, high-speed can making with glue is possible by removing only the glued portions of the paper surface and applying a polishing treatment. Furthermore, if necessary, in order to facilitate numbering printing such as the date of manufacture, the surface can be treated by removing that part, or a partially glossy design can be applied to the surface. Furthermore, the need for partial polishing treatment of paper surfaces is increasing in proportion to the times and in response to multi-purpose needs, for reasons such as saving on coating agents since the coating agent is applied only to the necessary areas.

Conventionally, when performing partial polishing, a gravure coater was used for partial coating, and a gravure coater device and an endless press device were used for partial press coating, but the gravure coater was used for preparatory work such as attaching and removing the plate. It takes a long time from start to start, and has disadvantages such as expensive mechanical equipment and plate-making costs, which significantly reduces the productivity of the endless press in partial press coating, except for partial coating. That is,
There is an imbalance in the processing capabilities of the two machines mentioned above.
Therefore, it was not possible to perform partial polishing in a series of steps using a combination of both machines.

As described above, there are drawbacks to the device, and even though the merits of partial polishing are widely recognized, the demand is not increasing sufficiently.

In view of the above-mentioned circumstances, this invention provides a paper surface polishing device that can perform partial polishing of a paper surface in a series of steps at high speed.

The gist of the system is to provide a series of paper feeding devices that automatically feed sheets of paper to be polished, a powder removal device, a corona discharge treatment device, a flexo coater device, a drying device, and an endless device to polish paper surfaces. It constitutes the device.

In other words, by using a flexo coater, it is easier to install and remove the plate, the time required to prepare for polishing treatment is shortened, and the application area can be easily touched up, and at the same time, compared to a gravure coater, it requires less mechanical equipment and plate making. It is inexpensive and enables surface treatment of a wide variety of products in small quantities.

Furthermore, the endless press can be operated without reducing production. Therefore, partial polishing of the paper surface can be performed quickly and smoothly in a series of steps.

This invention will be explained below based on the illustrated embodiments.

Reference numeral 1 denotes a paper feeding device that automatically supplies sheets 3 placed on a paper tray 2 whose surfaces are to be polished, and the sheets 3 fed from the paper feeding device 1 are transferred to a powder removing device 4. sent to The powder removing device 4 has a pair of brushing rolls 5, 5, and when the sheet 3 is passed between the brushing rolls 5, 5, powder adhering to the front and back surfaces of the sheet 3 is removed. Note that the powder removal device 4 evacuates the inside of the machine, and its exhaust port is connected to a dust collector (not shown).
The removed powder is collected in this dust collector.

The sheets 3 sent out by the powder removing device 4 pass through a belt conhair 6, and the corona discharge treatment device 7 is provided with an endless belt 10 suspended by suspension rolls 8, 8, tension rolls 9, etc. An electrode roll 11 is provided at the center of the back surface of 10, and the electrode roll 11
A corona discharge electrode 12 is provided on the surface of the endless belt 10 so as to face the corona discharge electrode 12 .

The sheets 3 fed to the corona discharge treatment device 7 through the belt conveyor 6 are fed to the endless belt 10.
The electrode roll 11 and the corona discharge electrode 1 are placed on the
2, and in this process is subjected to corona discharge treatment by the corona discharge electrode 12.

This activates the surface inactive state of the dryer or wax in the printing ink, improves the wettability and adhesion of the surface, and makes it easy to perform polishing treatment.

The sheets 3 that have undergone the corona discharge treatment are fed to a flexo coater device 13 . The flexo coater device 13 is provided with a glossy paint coating roll 14 made of synthetic resin, which has a plate a made of rubber or the like attached to a cylinder serving as a plate cylinder, and a receiving roll 15 to rotate in conjunction with each other. A paint supply roll 16a consisting of a mesh roll is disposed, and a paint storage roll 16b is disposed in contact with the paint supply roll 16a.

In the flexo coater device 13, an amount of paint suitable for glossing is applied to the paint coating roll 14 on the paint application roll 14 via the paint supply roll 16a, so that the sheet 3 supplied to the coater device 13 is coated with the paint. The glossy paint is applied to an appropriate thickness when passing between the use roll 14 and the receiving roll 15.

Thereafter, the hot air is supplied through a conveyor belt 17 into an infrared drying device 18 . Warm air dryer 18
is provided with an endless belt 21 suspended by suspension rolls 19, 19 and tension rolls 20..., far-infrared heaters 22... and Erohin heaters are arranged on the endless belt 21, and a pressure fan 23 is placed on the upper part of the machine frame. , 23 are provided.

The sheets 3 placed on the conveyor belt 17 are transferred to an endless belt 21 and passed under far-infrared heaters 22, where the sheets are heated by air supplied from the far-infrared heaters 22 and pressure fans 23, 23. Warm air is blown onto the surface of the sheet 3, and the sheet 3 coated with glossy paint is stably dried.

After passing under the far-infrared heaters 22..., the sheet 3 is placed on an endless belt 21 and advances for a while, and then, if necessary, is supplied to a pressurized humidifier 25 equipped with a water tank 24 below. The pressurized humidifier 25 includes a pressure roll 25a, a water absorption roll 25b made of sponge or cloth, etc., which is in contact with the pressure roll 25a, and a fanning roll 25c, which is in contact with the water absorption roll 25b and a part of which is immersed in the water tank 24. The sheets 3 placed on the endless belt 21 are fed between the pressure roll 25a and the water absorption roll 25b.

In the pressurized humidification device 25, appropriate moisture is supplied to the water absorption roll 25b from the fanning roll 25c immersed in the water tank 24, and this water supply roll 2
Since the sheet 3 passes between the pressure roller 5b and the pressure roll 25a, the sheet 3 receives appropriate humidification and pressure, thereby imparting flexibility to the paper. Next, the sheet 3 is placed on the roll 25
It is supplied to the endless device 27 through a belt conveyor 26 connected to the parts a and 25b.

The endless device 27 is provided with an endless stainless steel belt 30 suspended between a heating roll 28 and a roll 29. It is heated to ~140℃, and this is transferred to an endless steel belt 30℃.
The heat is transferred to the

Further, a pressure roll 31 whose shaft is pressurized in the axial direction of the heating roll 28 by a hydraulic mechanism is provided,
Therefore, the sheets 3 fed to the endless device 27 are heated and pressurized while passing through the endless steel belt 30 and the pressure roll 31, and the mirror surface of the endless steel belt 30 coats the sheets with glossy paint. Makes the coated surface shiny. Water cooling nozzles 32 are provided in the endless device 27 and constantly cool the endless steel belt 30, so that the polished surface of the endless steel belt 30 is peeled off from the mirror surface of the endless steel belt 30.

Therefore, a conveyor belt 33 is provided below the endless steel belt 30 to receive the sheets that have naturally peeled off from the endless steel belt 30 and have been peeled off by hand, and guide them to the outside of the endless device 27. The transferred sheet is sent to an automatic paper pick-up device 34.

As described above, in this invention, the sheets 3 are transferred to the paper feeder 1, the powder removal device 4, the corona discharge treatment device 7, the flexo coater device 13, and the hot air dryer 1.
8. The sheets 3 are passed through the endless device 27 one after another to perform a polishing process on appropriate parts of the sheet 3. In this invention, by using a flexo coater, it is easy to install and remove the plate. This reduces the time required to prepare for polishing treatment, and makes it easier to rework the coating area. At the same time, compared to gravure coaters, machinery and plate making costs are lower, and surface treatment of a wide variety of products and small quantities is possible. Become.

Furthermore, the endless press can be operated without reducing production. Therefore, partial polishing of the paper surface can be performed quickly and smoothly in a series of steps.

Furthermore, since the flexo coater device 13 is used, the plate making a can be easily attached and removed, the time required for preparation for polishing treatment is shortened, and the coating section can be easily reworked. In addition, compared to a gravure coater, the mechanical equipment and plate-making costs are lower, and it is possible to produce a wide variety of products in small quantities.
The paint supply roll 16a is designed so that various mesh rolls that can adjust the amount of application can be easily replaced, and can supply the amount of paint suitable for polishing to the sheet surface.

Furthermore, in this embodiment, by providing a powder removing device 4 and a corona discharge treatment device 7, the surface inert state of the dryer or wax in the printing ink that is observed during high-speed printing is activated, and the surface wettability is improved. , to create a condition that facilitates polishing treatment, such as by increasing adhesion.

In addition, in this embodiment, in order to prevent poor press bonding of the sheets, which may cause matting or cracking over time, a pressure humidifier 25 and an endless device are provided to uniformly cover the entire surface of the sheets. However, when partially glossing the paper surface as in this invention, uniform pressure bonding over the entire paper surface may not be necessary, and in this case, the above-mentioned device can be omitted.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a plan view, FIG. 2 is a side view, and FIG. 3 is an enlarged side view of main parts. In the figure, 1 is a paper feeding device, 13 is a flexo coater device, and 18 is a hot air infrared dryer.

Claims (1)

[Scope of utility model registration request] A paper surface polishing device that is equipped with a series of a paper feeding device that automatically supplies sheets of paper to be polished, a powder removal device, a corona discharge treatment device, a flexo coater device, a drying device, and an endless device.