JPS6213181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a single facer (one-sided corrugated board manufacturing apparatus) which is one unit of a corrugating machine.

Single facer is made by forming a core paper into a corrugated shape using a pair of corrugated rolls, then gluing the crest of the corrugated core paper, and then gluing it to the liner paper fed to the pressure roll side to form a single-sided corrugated paperboard. That is. Conventionally, in many types of single facer, the core paper caught between a pair of corrugated rolls is guided to the pressure roll, and during about half a rotation of the lower roll, the core paper tends to jump out of the corrugated groove due to centrifugal force. In order to stop the springback force due to internal distortion that occurs when the core paper is corrugated, a receiving member called a finger plate is pressed against the lower roll.

However, in recent years, the finger plate has been abolished,
The method is changing to one in which the core paper is attracted to the lower roll using gas suction power. Single facer is usually used during pressurization to facilitate corrugation of the core paper, increase the strength of the paper and prevent it from breaking during pressurization, and to bond the core paper and liner together. In order to rapidly solidify the liquid starch paste and provide the necessary force for adhesion, the rolls are heated to a temperature of 150°C to 200°C, for example, by blowing high-temperature steam into the hollows of the upper and lower rolls and the pressure roll, respectively. The peripheral surface is heated.

However, as mentioned above, when cold air is sucked by vacuum force from inside or around the lower roll in order to adsorb the core paper, heat is taken away from the lower roll and the necessary amount of heat is given to the lower roll as described above. This results in a loss of energy. In addition, an imbalance occurs between the heat supply section and the heat loss section of the lower roll, which inhibits uniform heat transfer, and the rolls may bend and thermal stress may occur. This is not preferable in the production of corrugated cardboard products.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and by discharging the exhaust gas from the vacuum suction mechanism near the suction part on the circumferential surface of the lower roll, the loss of supplied heat amount is reduced and energy saving is achieved. The purpose of this invention is to provide an effective single phaser.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a single facer showing an embodiment of the present invention, FIG. 2 is a sectional view taken from X to X in FIG. 1, and FIG. A piping diagram showing a piping system of a single phaser showing an embodiment of the invention, and FIG. 4 is a front sectional view showing the vicinity of the lower roll, in which 1 is an upper roll, 2 is a lower roll, 3 is a pressure roll, and 4 is a front sectional view showing the vicinity of the lower roll. is a glue roll, 5 is a doctor roll, 6 is a glue container, 7 is glue, 8 is a core paper, 9 is a liner, 10 is one-sided corrugated paper, 11 is a long hole, 12 is a circumferential groove, 13 is a rotary joint, 14 is a frame, 15 is a bearing, 16
is a disk, 17 is a suction duct, 18 is a suction pipe,
19 is a flexible hose, 20 is a blower, 21
2 is an exhaust pipe, and 22 is an exhaust duct.

As shown in Fig. 2, the single facer consists of a group of rolls including an upper roll 1 and a lower roll 2 whose roll surfaces are processed into a corrugated shape, a pressure roll 3 with a smooth surface, a glue roll 4, a doctor roll 5, etc. , a glue container 6, etc. are the main components.

Moreover, as shown in FIG.
The pressure rolls 3 are rotatably supported by the frame 14 via bearings 15 at their respective roll shaft ends, and one shaft end is connected to a drive device (not shown). Furthermore, the other shaft end is
It is connected to a steam supply device via a rotary joint 13.

Next, to explain the suction system, the lower roll 2 has a plurality of long holes 11, and a plurality of circumferential holes communicating with the long holes 11 and surrounding the outer peripheral surface of the lower roll cell at appropriate intervals in the circumferential direction. Groove 1
2 is provided. Further, a disk 16 is provided on the roll cell end surface of the lower roll 2 so that the position of the long hole 11 on the circumference and the hole drilled in the disk 16 coincide with the long hole 11, and A suction duct 17 is disposed that is open only in the portion where the core paper 8 is to be sucked.

The blower 2 is connected to the suction duct 17 through a piping system such as a flange, a suction pipe 18, and a flexible hose 19.
0 is placed. The exhaust from the blower 20 is
The gas is discharged through an exhaust system such as an exhaust pipe 21 from an exhaust duct 22 having an exhaust port close to the circumferential groove 12 of the lower roll 2 .

Next, to explain the operation, the single-sided cut cardboard 10 is manufactured by the following steps. First, Figure 1, Figure 2
In the figure, the core paper 8 is supplied to the upper roll 1 side, is caught in the engagement portion between the upper roll 1 and the lower roll 2, and is processed into a wave shape. At this time, in order to facilitate the forming of the core paper 8 and increase the strength of the paper, heat is supplied to the hollow portions of the upper roll 1 and the lower roll 2 through the rotary joint 13 from a heat supply source such as a steam supply device. is supplied. The core paper 8 formed into a corrugated shape in this manner is passed through an air intake system from a blower 20 to an air intake duct 17, a disk 16, and a plurality of long holes 11 so as not to come off the grooves as the lower roll 2 rotates. , air is sucked in through the circumferential groove 12, and the core paper 8 is attracted by its suction force.

The adsorbed core paper 8 is glued to the corrugated top part by a gluing roll 4, and is pressed and bonded to a liner 9 supplied to the pressure roll side, thereby forming a single-sided corrugated paperboard 10. Note that the pressure roll 3 is also heated in the same way as the upper and lower corrugated rolls 1 and 2 in order to rapidly solidify the liquid starch glue 7 normally used for bonding and provide the force necessary for adhesion.

The feature of the embodiment of the present invention is that the high-temperature air discharged from the blower 20 is directly blown through the exhaust pipe 21 from the exhaust duct 22 onto the circumferential groove portion 12 of the lower roll 2, and This is because it reduces the temperature drop.

As explained in detail above, the present invention is structured so that the air sucked from the lower roll is recycled and discharged to the suction hole of the lower roll, that is, near the suction part on the circumferential surface of the lower roll. As it circulates, the temperature gradually rises, and it remains at a very high temperature, so the amount of heat radiated from the lower roll is reduced, and the loss of the amount of heat supplied is reduced, so it is effective in terms of energy saving. First, it is extremely effective in uniformizing the temperature distribution on the circumferential surface of the lower roll.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a single facer showing an embodiment of the present invention, Fig. 2 is a sectional view taken from FIG. Explanation of the main parts of the diagram, 2...lower roll, 8...
... core paper, 10 ... single-sided cardboard paper, 11 ... long hole, 12 ... circumferential groove, 17 ... suction duct, 18
... Suction pipe, 20 ... Blower (vacuum suction mechanism),
21...exhaust pipe, 22...exhaust duct.

Claims (1)

[Claims] 1. In a single facer having a vacuum suction mechanism for adsorbing and guiding the core paper to the lower roll, air sucked by the vacuum suction mechanism from the hollow part of the lower roll is passed through the lower roll through an exhaust pipe. A single facer characterized by having an exhaust duct disposed near the suction part on the circumferential surface of the roll.