JPS63139737A - Single facer - 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 [Field of Industrial Application] The present invention relates to a single facer which is a unit of a corrugating machine for manufacturing corrugated cardboard sheets.

[Conventional technology]

As shown in FIGS. 6 and 7, a conventional single facer of this kind has an upper roll 1 and a lower roll 2, and the upper roll 1 and the lower roll are attached to a core paper 5 supplied from the upper roll 1 side. The glue 10 in the container 9, which has been scooped up by the gluing roll 4 and adjusted to form a glue film by the doctor roll 8, is pasted onto the top of the stepped core paper 5. The liner 6 supplied from the pressure roll 3 side is bonded to the lower roll 2 and the pressure roll 3 at the pressurized parts to form a single-sided corrugated sheet 7. As mentioned above, the upper roll 1, the lower roll 2, the pressure roll 3
In a single facer having a basic roll configuration, when the corrugated core paper 5 is rotated and sent along the outer periphery of the lower roll 2, there is a force that causes the core paper 5 to pop out due to centrifugal force, and the core paper 5 is subjected to the corrugated forming process. It is necessary to suppress the so-called springback force that attempts to return the stage to its original state due to internal strain that occurs when the stage is moved. Therefore, in the past, a restraining plate called a finger plate was installed along the lower roll 2 through the stepped core paper 5, but in this method, the sliding between the core paper 5 and the finger plate was prevented. As a result, there has been a problem in which an undesirable phenomenon occurs in which the height of the core paper is uneven and the sheet strength is lowered, so in recent years, a method has been adopted in which the corrugated core paper is sucked to the lower roll 2 and fed. As shown in FIGS. 6 and 7, one example of this method is to form surrounding grooves 8 on the circumferential surface of the lower P-loo 2 at appropriate intervals in the roll axis direction, and to form through holes parallel to the roll axis. A plurality of grooves 9 are arranged in a radial manner so that the surrounding groove 8 and the through hole 9 communicate with each other.
The structure is such that the through hole 9 and the surrounding groove 8 are connected to each other to create a negative pressure, and the core paper 5 is attracted by this suction force.

As described above, the lower roll 2 used in the conventional suction type single facer has a complicated shape as described above, and its manufacture is performed as follows. The above-mentioned lower roll 2 is conventionally processed with the roll body as an integral piece.
The procedure is to make a long through hole 9 with a drill and to make a surrounding groove 8 with a disc grindstone. At this time, the surrounding groove 8 of the lower roll 2
When the liner 6 and the core paper 5 are bonded together, the paper is not suppressed at the engagement part with the pressure roll 3, so that the paper is not bonded to the single-sided corrugated sheet 7 by a width corresponding to the width of the surrounding groove 8, so-called dry streaks. However, it is preferable that the width of the surrounding groove 8 be as narrow as possible in order to obtain the strength of the remaining cardboard, but the physical limitation of the width of the disc grindstone is unavoidable, and the current limit is about 2W. There is.

In addition, it is desirable to reduce the width of the surrounding groove 8 in order to reduce dry streaks, but if the entire groove depth direction is narrowed to a small size, paper dust or foreign matter may become clogged and prevent the generation of negative pressure during operation. Because of this inconvenience, it would be desirable to form the surrounding groove 8 so that it expands toward the inner diameter, but this has been a difficult topic in terms of manufacturing technology.

In addition, in the single facer, since the corrugated board sheet 7 is manufactured by the above-mentioned manufacturing process, when the core paper 5 is drawn into the anastomosis between the upper roll l and the lower roll 2, the core paper 7
This scrapes the top of the corrugated roll 1.2, causing the roll to wear out. Corrugating rolls 1 and 2 that have become worn out are no longer capable of normal corrugating and adhesion, so the entire corrugating rolls are discarded after being re-grinded several times.

[Problem that the invention seeks to solve]

In the conventional single facer as described above, corrugated rolls that are worn out and become unusable must be discarded, which is an obstacle to resource conservation.

In addition, the lower roll of conventional equipment has manufacturing limitations on the surrounding groove width and structure, which makes it difficult to obtain corrugated pole sheet strength, and it is easy to get clogged with paper powder, etc., which impairs operability. It has problems such as being easy to use.

[Means for solving problems]

In the present invention, in a single facer whose basic structure is an upper roll, a lower roll, a pressure roll, etc. for step forming core paper, it is composed of an inner cylinder which is a lower roll and a plurality of stepped sleeves fitted therein, The stepped sleeve is made thinner toward the inner diameter so that the inside is wider than the outer surface of the surrounding groove.

[Effect]

The lower roll is composed of a cylindrical part and a plurality of stepped sleeves,
By fitting a plurality of stepped sleeves at intervals on the outer periphery of the inner cylinder so as to form a circumferential circumferential groove, a circumferential groove can be formed like in a conventional integral roll. Since there is no restriction, it is possible to form a narrow surrounding groove, thereby making it possible to reduce the width of dry streaks remaining on the single-sided corrugated board sheet and improve the strength of the corrugated board.

At this time, the stepped sleeve is made thinner on the inner diameter side, or a pocket is formed on the inner diameter side, so that the inside is made wider than the outer surface of the surrounding groove, so that the surrounding groove is not clogged with paper powder, etc. Never occurs.

Furthermore, if the axial grooves formed on the outer curved surface of the inner cylinder and/or the inner circumferential surface of the stepped sleeve are coated with a non-adhesive substance such as Teflon, adhesion of paper dust, glue, etc. can be prevented. .

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

In this embodiment, as shown in a front view including a partial cross-section in FIG. 1', and the lower roll is fitted with a cylinder 2'' having shaft portions 11 on both sides at intervals so as to form a roll circumferential circumferential flexible groove 8 on the outer periphery of the inner cylinder 2''. multiple stepped sleeves 1
It consists of 2. In addition, several grooves 13 continuously formed in the roll axis direction are radially arranged on the outer peripheral surface of the inner cylinder 2'', and these grooves 13 are provided with a sealing member on the air suction device 14 at the roll end surface. The perspective appearance of the lower roll 2 is shown in FIG.

Note that the upper roll 1, lower roll 2, and pressure roll 3 are rotatably attached to bearings fixed to the frame, respectively.
One end of some or all of the rolls is connected to a drive device 15. Sarani, upper roll 1, lower roll 2
, a steam supply device 1 is installed in the hollow part inside the pressure roll 3.
6, heating steam is supplied respectively.

Next, various structures have been proposed for the stepped sleeve 12 and the inner cylinder 2'', and examples of these are shown in FIGS. 3 to 5.

FIG. 3(1) shows an example in which the stepped sleeve 12B is gradually made thinner toward the inner diameter, so that the surrounding groove 8B has a room that is wider inside than on the outside.

FIG. 3(2) shows a stepped sleeve 12C formed with a slight flat portion on the outer diameter portion and gradually becoming thinner in the depth direction, that is, on the inner diameter side, as in FIG. 3(2). This is an example.

In FIG. 3 (3), a notch is provided in the stepped sleeve 12D,
This is an example in which a pocket is formed in the surrounding groove 8D.

If the structure is as shown in Fig. 3 (1) to (3), the surrounding groove 8
B.

8C and 8D can be made narrower at their entrances, and the width of the dry streaks in the single-sided corrugated paperboard sheet 7 can be narrowed, so that the strength of the corrugated paperboard can be significantly increased. Also, Figure 3 (1) ~
(3) Since the interior of the surrounding grooves 8B, 8C, and 8D is configured to have a larger room than the outer surface, it is possible to prevent paper dust and the like from accumulating, and the operability or maintainability is not hindered.

Next, FIGS. 4 and 5 show the structure of the grooves in cross-sectional views of the lower roll 2. FIG. 4(1) shows an example in which grooves 13A are formed continuously in the roll axis direction on the outer circumferential surface of the inner cylinder 2 and are arranged radially with a semicircular cross section. In FIG. 4(2), a rectangular groove 13B is shown to show that the groove can have various cross-sectional structures such as a rectangular shape by an easy manufacturing method. In addition, the stepped sleeve fitted to the inner cylinder 2cL is 1
Various structures such as 2A or 12]3 to 12D can be applied. Figure 4 (3) shows a non-adhesive substance such as Teflon 1 in the groove 13A.
An example coated with 3A is shown. This coating is possible due to the fact that the inner cylinder 2α and the stepped sleeve 12A are separated.

Fig. 5 shows an example in which no grooves are provided on the outer circumference of the inner cylinder 2'', but grooves 13C are provided radially on the inner circumferential surface of the stepped sleeve 12F. It is also possible to provide grooves on both inner circumferences of the stepped sleeve 12E.

In addition, in the single facer having the above-described structure, the core paper 5 has an upper roll L and 20 lower rolls, that is, an outer cylinder 1' with 10 upper rolls and an outer cylinder 2' with 20 lower rolls.
Alternatively, the stepped sleeve 120 is engaged to form a step, and the air suction device 1 is attached to the outer periphery of the lower roll 2.
The gluing roll 4 is held by the suction force that overcomes the centrifugal force and the internal distortion of the step-formed insect repellent core paper 5 by the action of negative pressure generated in the surrounding groove 8 through the through hole 9 or the groove 13 from the sizing roll 4. The liner 6 is glued to the top of the core paper 5 and is supplied from the pressure roll 3 side, the lower roll 2 and the pressure roll 3.
The single-sided corrugated paperboard sheet 7 is bonded at the pressurizing section and is continuously rolled out. At this time, if the structure of the stepped sleeve is such that the surrounding groove is small on the outer diameter and wide on the inner diameter, the trystreak width of the corrugated cardboard sheet can be reduced, the strength of the corrugated cardboard is improved, and the paper It won't get clogged with powder etc. In addition, even if the stepped portion of the lower corrugating roll 20 becomes worn out and becomes unusable, there is no need to discard the entire corrugating roll as in conventional equipment, and the old inner tube 2'' is retained and the new stepped outer tube 2' is replaced. By re-fitting the parts, they can be regenerated, making it possible to reuse resources and reduce costs.

〔Effect of the invention〕

By using the single facer of the present invention as described in detail above, it is possible to save resources for corrugated rolls, resulting in cost benefits, and it is also possible to reduce dry streaks without impeding driveability due to clogging with paper particles, etc. This can be expected to have effects such as improving the strength of the stepped poles.

[Brief explanation of the drawing]

Fig. 1 is a front view including a partial cross section of a single facer showing an embodiment of the present invention, Fig. 2 is a partial perspective external view of the lower roll in Fig. 1, and Fig. 3 (11, (2+, (3) ) is a partial cross-sectional view of the lower roll, Figure 4 (11, (21, (3), and Figure 5 are cross-sectional views of the lower roll, and Figures 6 and 7 are front views showing the conventional syndamer/7 acer. 1: Upper roll 2: Lower roll 3: Pressure roll 1': Stepped outer cylinder 1 of upper roll 1: Inner cylinder 2' of upper roll 2 Stepped outer cylinder 2 of lower roll 〃: Lower roll inner cylinder 12: Stepped sleeve 13: Groove 8: Surrounding groove Sub-agent Patent attorney Shige Okamoto 2 outsiders Figure 4

Claims (1)

[Claims] An upper roll and a lower roll that form the core paper into tiers, a gluing device that glues the top of the tiered core paper, and a liner that comes into contact with the lower roll and laminates the liner to the glued core paper to form one side of the core paper. In a single facer equipped with a pressure roll made of a corrugated cardboard sheet, the lower roll has an inner cylinder having shaft portions on both sides thereof, and spaces between each of the inner cylinders to form circumferential circumferential grooves on the outer periphery of the inner cylinder. A plurality of stepped sleeves each having a shorter axial length on the inner side than the outer side are arranged and fitted together, and a number of stepped sleeves are formed continuously in the roll axis direction between the inner cylinder and the sleeves. A single facer characterized in that the grooves are arranged radially, and the grooves are connected to an air suction device at the end face of the roll.