JPS5845046A - Method and device for applying adhesive in corrugated cardboard manufacturing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for applying an adhesive in a corrugated board manufacturing machine, and more particularly to a method and apparatus for applying an adhesive to cores having different thicknesses.

The present inventor previously invented a reinforced double-sided corrugated cardboard sheet for boxes having a secondary core of constant width, and the present applicant applied for this with K (% Application No. 50-112377, Japanese Patent Publication No. 56-1925).
No. 8), if a sub-core of a constant width is used, a composite core (made by laminating wide and narrow core base paper) will have a step difference and a difference in thickness. This difference in thickness is approximately α1 to α21 when core base paper with a basis weight of 1:zsp/m2 is used. Since the difference in thickness is small, conventionally, this difference has been ignored and the adhesive has been applied using a normal adhesive applicator, but this thickness has had an effect. For example, depending on the difference in thickness, the adhesive may be applied uniformly, and a smaller amount of adhesive may be applied to a portion where the thickness is smaller. Particularly when the adhesive is water-based, wrinkles may occur on the corrugated board sheet depending on the amount of water in the adhesive.

Since there is less adhesive in the areas where the liner thickness is small, the adhesive strength between the liner and the composite core differs locally.

The present invention aims to eliminate the above-mentioned drawbacks, and the purposes of the present invention are as follows.

A. Applying adhesive evenly to the tops of cores of composite cores having different thicknesses, especially narrow sub-cores.

38 To reduce the width of a corrugated cardboard sheet.

To increase the mechanical strength of a C0 corrugated board sheet.

The gist of the present invention, which can quickly achieve the above object, is as follows: 1. A method for applying adhesive to the top of corrugated core having partially different thicknesses; the amount of adhesive conveyed onto the applicator roll; a first adhesive control step in which the amount of adhesive conveyed onto the doctor roll is partially controlled by a doctor play F device in accordance with the difference in the thickness of the core. An adhesive control step; and a transfer draft for transferring the adhesive carried onto the doctor roll to the applicator roll in the second adhesive control step; Adhesive application method; and forming a core with partially different thicknesses sent from a core supply source into a corrugated core between first and second corrugating rolls, and forming a corrugated core on the circumferential surface of the second corrugating roll. In an apparatus for applying adhesive to the corrugated top of a mosquito corrugated core while holding the corrugated core above; an applicator roll rotating in the opposite direction to the second corrugating roll; and the same direction as the applicator roll. a doctor roll rotating to control the amount of adhesive delivered onto the applicator; a doctor blade device partially limiting the amount of glue delivered onto the doctor roll; a doctor blade of the doctor blade device; 4. A plurality of adjustment means for partially deflecting; This is an adhesive applicator in a corrugated board manufacturing machine.

The present invention will be described in detail below with reference to embodiments illustrated in the drawings.

FIG. 1 is a perspective view showing the overall configuration of the apparatus of the present invention.

Source (not shown, but typically a mill roll stand)
The core 1° fed from the main core base paper 12 is composed of the main core base paper 12 and one or more sub core base papers 141L, 14b. The first corrugating roll 2 of the sub core base paper 14a, 14b
2 (usually called the upper roll) and a second corrugating roll 24 (
(usually referred to as the lower roll).

It is bonded to the main core base paper 12 using an adhesive.

In FIG. 1, two sub-core base papers 14a and 14b are used, which is suitable for so-called two man-hours. Armpit sub core base paper 14a,
The number and position of 14b can be arbitrarily selected to suit the compaction of the corrugated cardboard box to be the product.

The core 10 is connected to the first and second corrugated rolls 22 and 24.
The wavy core 11 is formed into a wavy shape between the wafers. 1 at the top of the corrugated core 110. Adhesive is applied with an applicator roll 32, with different transfer amounts corresponding to the difference in thickness of the corrugated core 11, that is, corresponding to the positional core of the core paper 14a, 14b. The amount of transfer is controlled by a doctor roll 34 and a doctor blade device 40 (details will be described later).

The corrugated core 11 has adhesive applied to the top of the step.

By pressing the liner 16 against the corrugated core 11 with a press roll 26, the liner 16 is stepped.

The top adhesive is formed on a single-sided corrugated board 18.

FIG. 2 is a side view of the doctor blade device 40, and FIG. 3 is a WT side view showing the main parts thereof. Doctor blade 42
is reinforced with a blade retainer 44, and the doctor plate and blade 4 are
2 and the blade presser 44 are integrally screwed to the base body 50 with a screw 48 via a holder 46. The base body 50 is provided with a hollow portion 52 for accommodating the adjustment means 60 . FIG. 6 is a sectional view of the main part of FIG.
2d, surrounded by a lip 54 and a Chi/J section 56. The lip 54 is mechanically reinforced by the auxiliary lip 53, and the doctor blade 42 is in contact with the tip 55 of the lip 54.

A plurality of adjusting means 6o are movably arranged in the hollow portion 52. The adjustment means 6o.

A male screw 62 provided on the base body 50 and screwed into the nine female screw 51
a pusher 66 mechanically connected to the insert pin 64 so that the insert pin 64 can freely rotate; and a presser 66 that rotatably holds the insert pin 64 within the hollow portion 52. It is provided with presser springs 68a and 68b.

The presser springs 68a and 68b are attached to the base body 50 at the
Both ends are supported by supports 70 attached to both ends of the 0, and the plurality of insert pins 64 are rotatably held in the hollow part 62 in a weave pattern. (See Figure 4).

An adjustment knob 80 is provided on the outer end 65 of each insert pin 64.
is installed. When the adjustment knob 80 is rotated,
The insert pin 64 moves forward and backward, and the pusher 66 moves in the direction of pressing the doctor blade 42 or in the direction of separating from the doctor blade 42.

When the doctor blade 42 is in contact with the KF' doctor roll 34 as shown in FIG. The fourth roller is slightly spaced apart from the doctor roll 34, for example, by α1 to α2■. This gap is approximately equal to the difference in thickness of the core 10. This gap does not cover the entire width of the doctor blade 42, but the pressure element 66 of the adjusting means 60 partially deflects the doctor blade 42, so that the adhesive 36 on the doctor roll 34 is selectively scraped off. Then, the adhesive 37 is streaked on the doctor roll 34 (at the rear of the rotation).

That is, the doctor roll 34 rotates counterclockwise in FIG. 5 (see FIG. 5, 8). The adhesive 67 on the doctor roll is conveyed in a controlled quantity by the action of the doctor roll 34 and the applicator roll 32, and is added to the adhesive '33 on the applicator roll 32 and then transferred onto the applicator roll 32. metastasize. The adhesive 33 , 37 adheres to the top of the corrugated core 110 on the still surface of the second corrugated roll 24 .

At this time, the film thickness of the adhesive on the part where the adhesive 37 is added is approximately α1 to α2 m thicker than on the other parts. Therefore, the adhesive is applied in accordance with the difference in step height due to the difference in the thickness of the core 1o.

When the force with which the doctor blade 42 presses the doctor roll 34 or the gap between the trimmer blade 42 and the doctor roll 34 is to be adjusted as a whole, as shown in FIG.
Since the base body 5o is rotatably mounted on the base frame 90 about the shaft 92, the setting screw 96 provided on the base frame extension part 94 is adjusted. As for the actual adjustment method, first, the gap or pressing force between the doctor blade 42 and the doctor roll 34 is adjusted using the setting screw 96 so that the adhesive does not transfer to the side where the doctor roll 34 rotates. Next, the W! The adjustment knob 80 of the four-section means 60 is rotated to partially bend the doctor blade 42t with the pusher 66.

Since the present invention has the structure and operation □ as in the above embodiment, it has the following advantages.

A. The adhesive can be applied evenly to the corrugated tops of composite cores having different thicknesses, especially narrow sub-cores.

B. Therefore, during the production of corrugated cardboard, unevenness in heating and drying during processes such as heating with press rolls and drying with double facers is reduced, so various problems do not occur and the manufacturing speed of corrugated board can be increased. .

0. The adhesive is evenly applied, reducing the occurrence of washboard.

Since the moisture (in the adhesive) adhering to the top of the D0 corrugation becomes uniform, the warpage of the cardboard is reduced.

E. By uniformly applying the adhesive, unevenness in the adhesive strength between the inner core and the corrugated core is less likely to occur, and the mechanical strength of the corrugated board sheet can be further increased.

Incidentally, in the above embodiment, the sub core base paper 14a, 14t) was arranged on the side that comes into contact with the first corrugating roll 22.

When the second corrugating roll 24 is of a suction type (vacuum type), the sub core base paper 14a, 14b may be brought into contact with the second corrugating roll 24.

[Brief explanation of the drawing]

1 to 5 illustrate one embodiment of the present invention, in which FIG. 1 is a perspective view showing the overall configuration, FIG. 2 is a side view of the doctor blade device, and FIG. 3 is a second embodiment of the doctor blade device. 4 is a sectional view taken along the line 11 in FIG. 6, and FIG. 5 is a partially sectional side view of the adhesive coating device. 11... Corrugated core 22... First corrugating roll 24... Second corrugating roll 32... Applicator roll 34... Doctor roll 40... Doctor blade device 42... Doctor blade 60... Adjustment means 66... Suppressor 80... Adjustment knob

Claims (2)

[Claims] (1) In the method of applying adhesive to the corrugated corrugated tops having partially different thicknesses, ■ a first adhesive control step in which the amount of adhesive conveyed onto the applicator roll is controlled by a doctor roll; , @ A second adhesive control step in which the amount of adhesive carried onto the doctor roll is partially controlled by a doctor blade device in response to the difference in the thickness of the core, and θ the second adhesive A method for applying an adhesive in a corrugated board manufacturing machine, comprising a step of transferring the adhesive carried onto the doctor peel to the applicator roll in a control unit 1. (2) The core with partially different thicknesses sent from the core supply source is formed into a corrugated core between the first and second corrugating rolls, and the corrugated core is formed on the circumferential surface of the second corrugating roll. In an apparatus for applying adhesive to the corrugated top of the corrugated corrugated core while holding the corrugated core, the apparatus comprises: (1) an applicator roll rotating in a direction opposite to the second corrugating roll; O rotates in the same direction as the applicator roll, and the ab 12
a doctor roll that controls the amount of glue delivered onto the cake roll; and a doctor blade device that partially limits the amount of glue delivered onto the doctor roll. (2) An adhesive application device for a corrugated board manufacturing machine, which is patented as having multiple adjusting means for partially adjusting the doctor blade of the doctor blade device.