JPH0574837U - Hot air blocking device for offset rotary press - Google Patents

Abstract

(57) [Summary] [Purpose] In an offset rotary press, it is possible to prevent the cooling effect of the cooling roll from being deteriorated and the generation of dirt to be prevented by the hot air generated from the dryer. [Structure] Between the dryer 12 and the cooling roll 14, the gate plates 16 are arranged on both sides of the printing paper 18. The hot air generated from the dryer 12 is the gate plate 16
The cooling of the cooling roll 14 is prevented from being deteriorated by the hot air because it is blocked by the air flow and does not flow toward the cooling roll 14. Further, the cooling roll 14 is not contaminated by hot air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot air shutoff device for an offset rotary press.

[0002]

[Prior Art]

 In the offset rotary press, a dryer is provided to dry the printed paper, and the paper is dried by applying hot air. Since the ink used for offset printing contains a solvent, it can be dried almost instantaneously by hot air. The printing paper that has been exposed to hot air is sent to a cooling roll and cooled, which further enhances the ink drying effect.

[0003]

[Problems to be solved by the device]

 Conventionally, the hot air generated from the dryer is sent to the cooling roll along both sides of the paper, so that the hot air hits the cooling roll or the paper cooled by the cooling roll, which hinders the cooling by the cooling roll. There was a problem. Further, there is a problem that the cooling roll becomes dirty when the cooling roll is hit with hot air containing a solvent or the like.

The present invention solves the above problems, and effectively reduces the cooling effect and the contamination of the cooling roll due to the hot air generated from the dryer hitting the cooling roll in the offset rotary press. An object of the present invention is to provide a hot-air blocking device for an offset rotary press that can be prevented.

[0005]

[Means for Solving the Problems]

 According to the present invention, a hot-air blocking device in an offset rotary press has a hot-air blocking member arranged between the dryer and the cooling roll in the offset rotary press in proximity to both sides of the printing paper to be run, The hot air blocking member blocks the hot air generated from the dryer and sent to the cooling roll.

[0006]

【Example】

 Next, an embodiment of a hot air cutoff device in an offset rotary press according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a hot air blocking device in an offset rotary press according to the present invention. As shown in the figure, this apparatus is provided with a substantially arc-shaped gate plate 16 between a dryer 12 and a cooling roll 14 of an offset rotary press.

As is well known, the dryer 12 is for drying the ink by generating hot air and applying it to the printed paper. The hot air has a hot air temperature of 230 to 270 ° C. in the dryer. In the offset rotary press, since the heat-set type ink containing the solvent is used, it can be dried almost instantaneously by the hot air from the dryer 12.

The cooling roll 14 is composed of a plurality of rollers through which cooling water passes, and the printing paper 18 whose temperature on the surface of the paper is raised to around 110 ° C. by the hot air uses a hot air cutoff device, so that the paper surface temperature is Since the temperature can be lowered by 10 to 20 ° C., the temperature can be lowered to about 90 to 100 ° C., the cooling effect of the cooling roll can be enhanced, and the cooling roller is cooled by coming into contact with the next cooling roller. The cooling roll 14 cools the printing paper 18 to, for example, 30 to 40 ° C.

The gate plates 16 are formed and arranged in an arc shape on both sides of the printing paper 18 between the dryer 12 and the cooling roll 14. The gate plate 16 is supported by a rotating cylinder 20 and is supported by an arm 22 which is rotatable in the direction of arrow A. The gate plate 16 prevents the hot air generated from the dryer 12 and applied to the printing paper 18 from flowing toward the cooling roll 14, and is arranged close to the printing paper 18. Since the flapping of the printing paper 18 is about ± 5 mm, the clearance of the gate plate 16 is set to about ± 7.5 mm.

The gate plate 16 is not limited to the arc-shaped one as shown in FIG. 1, but may have another shape as long as it can effectively block the hot air from the dryer 12. For example, the cross section is not limited to a circular shape, but may be an ellipse or any other shape suitable for blocking hot air from the dryer 12.

According to this apparatus, since the arc-shaped gate plates 16 are arranged on both sides of the printing paper 18 between the dryer 12 and the cooling roll 14, they are generated from the dryer 12 and sent in the direction of the cooling roll 14. The hot air can be blocked by the gate plate 16. Therefore, it is possible to prevent the cooling and drying effects from being lowered due to the hot air hitting the cooling roll 14. Further, since the ink or the like scattered by the hot air does not adhere to the cooling roll 14, the cooling roll 14 is not contaminated.

FIG. 2 shows another embodiment of the present invention. In this device, an exhaust duct 24 is connected to the gate plate 16, and the exhaust duct 24 is connected to the blower 26 and the dryer 12. When drying and cooling are performed by the dryer 12 and the cooling roll 14, the blower 26 operates, the hot air blocked by the gate plate 16 is sucked by the blower 26, and is again passed through the exhaust duct 24 to the dryer. Sent to 12. According to this apparatus, since the hot air blocked by the gate plate 16 is collected in the dryer 12, the hot air can be effectively exhausted and the hot air can be reused in the dryer 12.

[0014]

[Effect of the device]

 According to the device of the present invention, it is possible to prevent the hot air generated from the dryer from being sent to the cooling roll in the offset rotary press, so that it is possible to prevent the cooling effect of the cooling roll from decreasing, and It can prevent the roll from getting dirty.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a hot air blocking device according to the present invention.

FIG. 2 is a view showing another embodiment of the hot air blocking device according to the present invention.

[Explanation of symbols]

 12 Dryer 14 Cooling Roll 16 Gate Plate 18 Printing Paper 20 Swivel Cylinder 22 Arm 24 Exhaust Duct 26 Blower

Claims (3)

[Scope of utility model registration request] 1. An offset rotary press having a hot air blocking member disposed between a dryer and a cooling roll in close proximity to both sides of a printing paper sheet to be run, the hot air blocking member generating the hot air from the dryer. A hot-air cutoff device for an offset rotary press, which cuts off hot air sent to the direction of the cooling roll. 2. The apparatus according to claim 1, further comprising a hot air collecting mechanism connected to the hot air blocking member, wherein the hot air blocked by the hot air blocking member is removed by the hot air collecting mechanism. A hot-air blocking device in an offset rotary press, which is characterized in that the hot air is collected in the dryer. 3. The hot air cutoff device according to claim 1, wherein the hot air cutoff member has a substantially arcuate cross section.