JPS58215349A - Apparatus and method for clear coating - Google Patents

Abstract

PURPOSE:To achieve a smooth coating by arranging a means of eliminating gap in a plate cylinder by enabling the driving of the form damping roller in a dampening apparatus and a dryer in a clear coating of printed matters. CONSTITUTION:When a dampening unit is used as dampener, a gear 14 is removed from gears 18 of a plate cylinder 1 and a damping roller 7 is rotated under a pressure in contact with the plate cylinder 1. When it is used as coater, the damping roller 7 is rotated with a gear 18 of the plate cylinder 1 at the equal peripheral velocity to the cylinder by the gear ratio determined through gears 13 and 14. Therefore, even when the nip pressure is limited with respect to the plate cylinder 1, the roller is allowed to rotate without slippage to eliminate roller lines or the like thereby preventing the coating surface from looking satin crape. A squeegee 15 is provided to check overflow of a coating agent 12 over the end face of a roll and an aluminum foil 29 is applied on a gap of the plate cylinder 1 to avoid attachment of a large amount of the coating agent 12 to the gap of the plate cylinder. This enables a smooth coating with an ordinary offset rotary press.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a clear coating device that enables in-line coating by filling the gear knob of the plate cylinder with a dampening device suitable for coating a portion of a normal offset rotary press with a water-based coating on printed matter. and the method thereof.

Currently, for the purpose of glossing printed matter or protecting it from moisture and other elements, printing is mainly done with a sheet-fed printing press and then varnished with a roll coater or the like in an oven, or the surface is finished with a mirror finish using an endless press after varnishing. Furthermore, laminate a film on the surface of the paper.

However, signatures printed on an off-cent rotary press are
Because it is folded to a certain standard size, it is difficult to apply it with a roll coater, and even if it were possible to apply it with some innovation, the throughput was slow and the high productivity merino technology of the off-cent rotary press was difficult to apply. Moreover, doing it offline involves a loss of time and money.

The present invention utilizes the final use of a rotary offset press to achieve an effect equivalent to varnishing among the surface finishing methods described above, while maintaining a normal printing speed.

In other words, an offset rotary press is used, which consists of an inking device, a dampening device that can drive the swimsuit roll in contact with the plate surface, a plate cylinder with no gaps, a blanket cylinder, and an impression cylinder (blanket cylinder for the B-B type). The inking roll and plate cylinder are kept in a non-contact state, the dampening device's water bowl is filled with coating agent, the plate cylinder is equipped with a plate for coating the entire or partial printed matter, and the printed web is coated with a coating agent. The present invention relates to a clear coating device and method for drying ordinary printing ink after applying a coating agent and drying the coating agent or the ink on the uncoated printing surface using a dryer to obtain a desired product.

By the way, the technology of in-line coating on printed matter is introduced in Japanese Patent Application Laid-Open No. 111293/1983, but it is clear from our experiments that the introduced technology alone is not practical when using an offset rotary press. .

In other words, using an offset rotary press whose essential elements are an inking device, a dampening water supply device, a plate cylinder, a blanket cylinder, and an impression cylinder, the dampening water supply device is used to supply the coating agent to the seven plate surfaces and the blanket cylinder. This method involves transferring the material to the paper and then applying it to the paper, but this method alone cannot produce a coating in a state suitable for practical use. One of the reasons for this is that a large amount of coating agent adheres to the gap between the plate cylinders. A gap in the plate cylinder is necessary for plate mounting, and exists in all types of offset rotary presses.

Therefore, are there any measures to prevent coating agent from getting into the gap? If this is not done, the current coating method using an offset rotary press will be completely unsuitable for practical use.

To explain this in detail with reference to Figure 7, Figure 1 shows the plate cylinder (11 (41) and blanket cylinder (2) (
3 + A 7 kiln roll + 51 (61 This diagram shows the relationship between the dampening water supply device and the gap between winter clothes. In the plate shown in the figure, the plate cylinder (11 (41)
The difference in phase is 1800 with respect to the gap of + +31, but in Figure 3, the phase relationship between the plate cylinder and blanket cylinder is the same as in Figure 2, and the diameter of the blanket cylinder is the same as that of the plate cylinder. It is an integral multiple of the diameter of the barrel.

Therefore, in the case of FIGS. 1 and 3, the gap between the plate cylinders always meets at a location other than the gap between the blanket cylinders.

In FIG. 2, the plate cylinder gap always contacts the blanket cylinder gap once during one revolution. Now, in order to apply the coating agent to the web, the ink rollers (51(6), (51'(61'), (5F'(6r) are placed in a non-contact state with the plate surface, and the water pots (9), (10), (911
101'(9f'
81" V plate surface (water supply state) and apply the coating agent to the plate cylinder (11 (41, (11'), (II" (4)).
”, then the blanket cylinder (2+ (31
, t2)'(3+', (2f) (Transfers to 3f, and further transfers to the web, completing the coating agent application. In particular, the time when the gap of the plate cylinder contacts the swimsuit roll will be explained with reference to FIGS. 4 and 5. do.

When the gap of the printing cylinder (11) comes into contact with the swimsuit roll (7), the swimsuit roll (7) and the printing surface Uυ are rotating with a certain nip pressure (contact pressure), so the rubber-like elasticity A part of the swimsuit roll (7), which is the body, enters the gap of the plate cylinder (1), and the coating agent Q2) is squeezed out and a large amount is deposited on both edges of the printing plate, resulting in a state as shown in FIG. If such a state occurs on the printing plate, the distribution of the coating agent applied to the web paper requires drying the coating agent and ink with a dryer after applying the seventh coating agent, but for the above reasons, it is necessary to dry the coating agent and ink on the web paper in large quantities. In order to dry the coating agent, the drying temperature is 20°C higher than the originally required drying temperature (paper surface temperature 110°C to 140°C).
If the temperature is not raised to about 40°C, drying will be poor and the coating agent may adhere to the guide roll after drying.
When the folding machine rubs the folding machine, or the folding sheets are cut to a certain standard and then stacked in the stacker, blocking occurs due to insufficient drying of the coating agent, and not only are the folded sheets not aligned in the stacker, but the folded sheets are It becomes completely unsuitable for the bookbinding process. Therefore, the part 4 with a large amount of coating agent
It is necessary to completely dry μ, which is disadvantageous because the energy cost is high.

In this case, a good effect can be obtained as long as the coating agent is applied to the gap between the plate cylinders. However, with this method, a large amount of coating agent is attached to the gap of the plate cylinder (bar pressure), which is 5% to 7%.
The cents are set so that it is about This is because the swimsuit roll (7) is not driven by a gear or the like, but is rotated by contact pressure with the plate surface U, and must be set so as not to cause slippage. Therefore, as described above, it becomes difficult for the swimsuit roll (7) to rotate at the same circumferential speed. In other words, because a coating agent is used, the plate cylinder (1) and swimwear roll (7) are prone to slipping.
As a result, the coating agent cannot be transferred uniformly to the plate surface Uυ, and if it is applied to the web in this state, the roller marks will be completely damaged (fL4j) (a product with no commercial value will be created).

By the way, in a printing machine like the one shown in Figure 2,
In other words, if the gap of the plate cylinder (11'(41') is the same as the gap of the blanket cylinder (21'+31'), the first
Compared to the printing press in which the gap position is as shown in FIGS. Therefore, it is difficult to transfer, but as time passes, the coating agent accumulates in the gap between the plate cylinder (2)', and eventually a large amount of the coating agent transfers to the gap end of the blanket cylinder (2)', resulting in the same result. .

Furthermore, the smaller the nip pressure between the plate cylinder il+ and the swimsuit roll (7), the better the coated surface condition. In other words, if the bar pressure is about 5% to 7% (normal printing condition), the surface will become bulge-like.

Therefore, it is necessary to prevent a large amount of coating agent from adhering to the gap between the plate cylinders, and to provide a device that guarantees the rotation of the swimsuit roll even if the nip pressure between the plate cylinder and the swimsuit roll is reduced.

The present invention solves these problems all at once, and will be explained with reference to the drawings.

FIG. 8 and FIG. 9 are explanatory diagrams of one embodiment of the present invention, and when used as a dampener in a dampener device shown in the figure, the gear (141 is gear α3) (181 is engaged (181) is disengaged from the swimsuit roll. (7) rotates due to contact pressure with the plate cylinder (1).

When used as a coater according to the gist of the present invention, the gear α3 is fixed to the shaft of the plate barrel).
), the gear I is rotated, and the gear Q41 is rotated through the swimsuit roll (
7) is fixed.

The number of teeth on each gear is 1 for the plate cylinder and 7 for the swimsuit roll.
Since the circumferential speeds of the swimsuit rolls (5) are determined to be the same, even if the nip pressure of the swimsuit roll (5) against the plate cylinder is small, the swimsuit roll (5) rotates without slipping, so roller marks etc. do not occur. Furthermore, since the pressure can be reduced (bar pressure 2%) = Mikotin λ-'2, the polished surface does not become pear-shaped. The squeegee (19) has a shape as shown in the figure and is provided so as to be in contact with both end surfaces and both end side surfaces of the roll (16), and the squeegee (15) squeegee the coating agent.Thereby, the coating agent α2 This prevents the coating agent from being supplied in a state overflowing near the end face of the roll.Furthermore, an aluminum foil (5)) is pasted on the gap to prevent a large amount of coating agent from adhering to the gap.

Normally, the gear gap width of the blanket cylinder is about 10%, and since the width of the gap of the plate cylinder is less than that, the width of the aluminum foil to be attached is sufficient to be about 12% to 15X.

In addition to the methods described above, there are the following methods for preventing excessive adhesion of the coating agent to the gap portion.

To explain with reference to FIG. 10, a bar shaped to fill the gap is installed in the gap portion. More specifically, the bars (one has tapped holes at both ends and are fixed with screws (20) through through holes in the bearer (2) of the plate cylinder (1).The fixing method is not particularly limited. Not a printing cylinder (1)
It is also possible to drill a tap in the center direction and fix it with a screw.

As described above, according to the present invention, it is possible to easily prevent a large amount of coating agent from depositing on the gear knob portion, and to prevent the harmful effects of the cypress that occurs due to this. The turning machine allows for smooth coating.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 3 are explanatory diagrams showing the structure of an ordinary offset rotary press, and FIGS.
FIG. 7 is an explanatory diagram illustrating that a large amount of coating agent adheres to the gap portion, FIGS. 8 and 9 are explanatory diagrams illustrating the present invention, and FIG. 10 is an explanatory diagram showing another embodiment. be. (91(9do(9r'(101(10)'(101'-
Water Tsuho (11) - [Surface α2... Coating agent (13) α41 (181... Gear (1!5+... Squeegee-06) (1ri)... Roll (19)... Bar (20+...・Screw 0
1)...Bearer: Patent applicant Kazuo Suzuki, Representative of Toppan Printing Co., Ltd. 1. \ ,J-,7-2(

Claims (4)

[Claims] (1) In an apparatus for applying clear coating to printed matter using a rotary offset printing machine whose components include an inking device, a dampening device, a plate cylinder, a blanket cylinder, and an impression cylinder, the swimsuit roll of the dampening device can be driven. ,
A clear coating device characterized by having a means for eliminating gears on a plate cylinder and a drying device. (2) The clear coating apparatus according to claim 1, wherein the means for eliminating the gap is to provide a squeegee on both end faces and both end side faces of the roll and to affix aluminum foil to the gap portion. (3) The clear coating apparatus according to claim 1, wherein the means for eliminating the gap is a bar having a shape that fills the gap. (4) An inking device, a dampening device capable of driving a swimsuit roll in contact with the plate surface, a plate cylinder without a gear lug,
Using an off-cent rotary press consisting of a blanket cylinder, the inking roll and plate cylinder are kept in a non-contact state, a coating agent is put in the water pot of the dampening device, and the plate cylinder is coated on the entire surface or part of the printed matter. After installing the printing plate and applying the coating agent to the printed web, a dryer that dries ordinary printing inks is used to dry the coating agent or ink on the uncoated printing surface to obtain the desired product. Coating method.