JPS646941Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gluing mechanism, particularly to a gluing mechanism used in a corrugated board manufacturing machine.

In the production of corrugated board sheets, a corrugated core base paper is coated with a sizing liquid at the top of the corrugations as it passes through a gluing mechanism, and is then pressed and adhered to a liner.

The conventional gluing mechanism consists of a group pan that stores size liquid, a glue roll that rotates while its bottom is immersed in the size liquid in the group pan, and limits the size liquid that adheres to the surface of the glue roll to an appropriate thickness. This glue roll transfers a certain amount of glue onto the corrugated top of the core base paper. Some glue rolls of this type have a plurality of mesh-shaped chambers formed on the side circumferential surface to accommodate the glue liquid.

However, with conventional gluing mechanisms, it is not easy to adjust the size liquid to an appropriate amount using a doctor roll. In the case of adhesives, starch pastes with low water content, and low-temperature adhesives used from the viewpoint of energy conservation, the amount transferred to the top of the step by the glue roll must be adjusted to an appropriate amount because the glue has a high viscosity and strong tack. It was extremely difficult to maintain.

An object of the present invention is to provide a gluing mechanism that can transfer an appropriate amount of a sizing liquid with high viscosity and strong tack to the corrugated tops of corrugated cardboard sheets.

In order to achieve this purpose, the present invention includes a group pan for storing size liquid, a glue roll supported so as to be able to rotate while the lower part is immersed in the size liquid of the group pan, and a size liquid attached to the glue roll. In order to adjust the size liquid to an appropriate amount, a doctor roll is rotatably supported in close proximity to the glue roll, and a doctor roll is placed at a position in front of the location where the glue roll transfers the size liquid to the corrugated top of the core base paper in the rotational direction. In a gluing mechanism consisting of a gluing bar attached so that its tip is in contact with the side circumferential surface of the glue roll, at least one bar capable of accommodating a size liquid is provided around the entire length of the side circumferential surface of the glue roll. A spiral groove is formed, and a spiral ridge that engages with the spiral groove of the glue roll is formed around the entire length of the side circumferential surface of the doctor roll, and the doctor roll is moved in the same direction as the glue roll. It is characterized by being rotated.

The glue roll may be a metal roll or a metal roll coated with a polyurethane material. The glue roll may be formed entirely of polyurethane material.
One or several spiral grooves are formed on the side peripheral surface of the glue roll. Preferably, the bottom surface of the groove is a curved surface.

The doctor roll is made of a metal roll coated with a polyurethane material, or made entirely of a polyurethane material. On the side peripheral surface of the doctor roll, spiral ridges that enter the spiral grooves formed in the glue roll are formed in the same number and pitch as the spiral grooves. The height and width of the spiral ridge may be smaller than the depth and width of the spiral groove. The doctor roll preferably has the same diameter as the glue roll, and rotates in the same direction as the glue roll while meshing with the glue roll.

Next, a preferred embodiment of the gluing mechanism according to the present invention will be described with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, the gluing mechanism includes a group pan 10 that stores a size liquid, a glue roll 20 that is supported so as to rotate while being immersed in the size liquid 11 in the group pan, and a glue roll 20. A doctor roll 30 is supported to rotate while interlocking with the doctor roll, and a doctor roll 30 is attached to the glue roll at a position above the doctor roll and before the point where the glue roll transfers the size liquid to the corrugated top of the core base paper. It consists of a urethane glue cutting bar 40 attached so that its tip is in contact with the side peripheral surface. The arrows in the figure indicate the rotation directions of both rolls.

FIG. 2A is a plan view of the glue roll 20 according to the present invention, showing a single spiral groove 21 that can accommodate the glue liquid.
is formed continuously over the entire length of the side circumferential surface (see FIG. 3A).

Figure 2B shows the doctor roll 30 according to the present invention.
is a plan view of the metal roll, in which a polyurethane material 31 is coated around the side of the metal roll, and the polyurethane material includes:
A spiral ridge 32 that enters the spiral groove 21 formed on the glue roll is formed continuously over the entire length of the side circumferential surface of the doctor roll (see FIG. 3B).

FIG. 2C is a plan view of the glue cutting bar 40 according to the present invention, which is mounted so that the end contacting the glue roll 20 protrudes from the fixture (see FIG. 3C).

To explain the operation of the gluing mechanism of the present invention, when the glue roll 20 rotates in the size liquid 11 of the group pan 10, the size liquid enters into the spiral groove 21 formed on the side circumferential surface and at the same time The surface is also covered with a film of glue. Since the spiral protuberance of the doctor roll 30 is engaged with the spiral groove 21 of the glue roll 20, the amount of glue in the spiral groove 21 can be adjusted by moving the doctor roll and adjusting the engagement between the two. Can be adjusted according to liquid viscosity, tack, etc. That is, when the doctor roll and the glue roll are deeply engaged, the amount of glue remaining in the spiral groove 21 of the glue roll is reduced, while when the doctor roll and the glue roll are shallowly engaged, the amount of glue remaining in the spiral groove is reduced. increases, and the amount of supply to the core base paper increases. Adjustment of the engagement between the doctor roll and the glue roll is performed while checking with a gauge.

After the glue roll 20 has the residual glue in the spiral groove 21 adjusted by the doctor roll 30, the excess glue on the side peripheral surface of the glue roll is removed by the glue cutting bar 40. In this way, the size liquid remaining in the spiral groove is transferred to the corrugated top of the core base paper or other desired location as the size roll rotates.

Note that it is preferable that the glue roll 20 and the doctor roll 30 rotate at the same circumferential speed.

As described above in detail, in the gluing mechanism according to the present invention, the doctor roll has spiral ridges formed along the entire circumference of its side surface that mesh with the spiral grooves of the glue roll, so that by moving the doctor roll relative to the glue roll to adjust the strength of meshing between the spiral grooves and the spiral ridges, the amount of sizing liquid remaining in the spiral grooves of the glue roll can be optimized according to the viscosity and tack of the sizing liquid, and the amount of glue applied can be selected to be uniform across the entire surface of the glue roll. This prevents excess glue material from adhering to the cardboard sheet, saving on sizing liquid and preventing deterioration in the quality of the cardboard sheet due to excess adhesion of sizing liquid.

Furthermore, by making the ridges provided on the entire length of the side circumferential surface of the doctor roll into a spiral shape, the grooves formed on the glue roll can be made into a spiral shape. Since the groove forming portion, that is, the crest of the groove, contacts the entire length of the glue cutting bar while changing the contact point as the glue roll rotates, the glue cutting bar is not limited to a specific location and can be made uniform. Therefore, there is no unevenness in the glue cutting bar, and the life of the glue cutting bar is extended.

Furthermore, since the doctor roll is rotated in the same direction as the glue roll, the two rolls will move in opposite directions at the meshing part, and even sticky glue will remain in the spiral groove of the doctor roll. The amount of glue can be adjusted.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the gluing mechanism according to the present invention;
2A, B, and C are plan views of a glue roll, a doctor roll, and a glue cutting bar according to the present invention, respectively, and FIGS. 3A, B, and C are plan views of a glue roll, a doctor roll, and a glue cutting bar, respectively, according to the present invention. FIG. 10... Group pan, 11... Size liquid, 20... Glue roll, 21... Spiral groove, 30... Doctor roll, 32
...Spiral ridge, 40...Glue cutting bar.

Claims (1)

[Scope of utility model registration request] A group pan for storing size solution, a glue roll supported so that it can rotate while its lower part is immersed in the size solution in the group pan, and a glue roll for adjusting the size solution adhering to the glue roll to an appropriate amount. A doctor roll that is close to the roll and is movably and rotatably supported relative to the roll, and a glue roll that is located at a position before the point in the rotational direction where the glue roll transfers the size liquid to the corrugated top of the core base paper. A gluing mechanism consisting of a gluing bar attached so that its tip is in contact with the side circumferential surface of the glue roll, at least one spiral groove capable of accommodating a size liquid around the entire length of the side circumferential surface of the glue roll. is formed, and a spiral ridge that engages with the spiral groove of the glue roll is formed around the entire length of the side peripheral surface of the doctor roll, and the doctor roll has
A gluing mechanism characterized in that it is rotated in the same direction as the glue roll.