GB2194974A

GB2194974A - Corrugating machine

Info

Publication number: GB2194974A
Application number: GB08718072A
Authority: GB
Inventors: Masateru Tokuno; Tetsuya Sawada
Original assignee: Rengo Co Ltd
Current assignee: Rengo Co Ltd
Priority date: 1986-09-09
Filing date: 1987-07-30
Publication date: 1988-03-23
Anticipated expiration: 2007-07-30
Also published as: FR2603523B1; DE3730270A1; NL189552C; CH678508A5; GB8718072D0; IT1222624B; NL8701824A; FR2603523A1; JPH0532280Y2; GB2194974B; IT8721848A0; NL189552B; JPS6343720U

Description

A 1

SPECIFICATION

Corrugating machine GB2194974A 1 The present invention relates to a corrugating machine for producing corrugated fiberboards.

A conventional corrugating machine com prises a single facer for producing a single faced corrugated fiberboard, a double facer for producing a double faced corrugated fiber board by glueing a front linerboard to the sin gle faced corrugated fiberboard fed from the single facer, a slitter-scorer, a rotary cutter and so on, all of the units being arranged one behind another on the same level in the direc tion of feed of web. Further, a first mill roll stand for supporting a pair of rolls of back linerboard is arranged upstream of the single facer, and a second mill roll stand for support ing rolls of corrugating medium and a third mill roll stand for supporting rolls of front lin erboard are arranged between the single facer and the double facer. Thus, the entire length of the machine is very long, occupying an enormous floor space.

In order to cope with the abovesaid prob lem, there has been proposed a corrugating machine having a three-stories structure in which the single facer is arranged on the lower deck, a space for accumulating the sin gle faced corrugated fiberboard from the sin gle facer is on the middle deck, and the dou ble facer is on the upper deck with the feed direction of the single faced corrugated fiber board reversed when the web passes from 100 the accumulating space to the double facer (Japanese Unexamined Patent Publication No.

50-70195).

With this prior art corrugating machine, the first and second mill roll stands for supporting the back linerboard and the corrugating me dium, respectively, are provided at both sides of the single facer qnd the accumulating space for the single faced corrugated fiberboard is arranged over the second mill roll stand, and the double facer is arranged over the area be tween the first mill roll stand and the second mill roll stand so that the web inlet to the double facer will be located over the second mill roll stand. It is further necessary to ar range a third mill roll stand for supporting the front linerboard at one side of the second mill roll stand opposite to the single facer and to arrange a slitter-scorer, a rotary cutter and so on downstream of the web outlet of the dou ble facer which is located over the first mill roll stand. Thus, although the overall length of this prior art corrugating machine is shorter than the machine having the single facer and the double facer and so on arranged on the same level, it is not still sufficiently short.

Another problem with the prior art machine is that if the web is accumulated for too long a time in the state of a single faced corru gated fiberboard, the single faced corrugated fiberboard heated at the single facer will be cooled to too low a temperature to assure a good bonding of the front linerboard thereto. If the accumulating space is shortened in or- der to prevent this problem, the double facer will have to be moved toward the first mill roll stand so that the entire length of the machine will be prolonged.

Still another problem with the above said prior art corrugating machine is that the single faced corrugated fiberboard from the accumulating space is fed into the double facer with the top of its flutes to be bonded to the front linerboard facing upward and is thus heated from below by heaters provided at the double facer. This means that the adhesive surface between the corrugating medium and the front liberboard is heated not directly but through the back linerboard and the corrugating me- dium that has been corrugated and thus contains air layers. In order to compensate for low heating efficiency, the machine speed has to be slowed down.

An object of the present invention is to pro- vide a corrugating machine which obviates the abovesaid shortcomings, which is compact in size, and which offers higher heating efficiency in bonding the front linerboard to the single faced corrugated fiberboard.

According to the present invention, since the double facer is arranged over the space between the first mill roll stand for supplying the back linerboard and the second mill roll stand for supplying the corrugating medium with its web inlet disposed over the first mill roll stand, the slitter-scorer and the rotary cut ter disposed downstearn of the double facer can be located over the third mill roll stand next to the second one. Thus, the corrugating machine according to the present invention is very short in the overall length and compact in size.

Also, since the single faced corrugated fiberboard produced by the single facer is fed into the double facer with its corrugated medium facing down, the adhesive surface between the front linerboard and the corrugated medium is effectively heated and dried from under by the heaters of the double facer. This improves the drying efficiency.

Further, since the length of the accumulating space for the single faced corrugated fiberboard can be reduced to a minimum, the drop of the temperature of the fiberboard by natural cooling is small. This assures a good adhesion between the single faced corrugated fiberboard and the front linerboard in the double facer.

The invention will now be described by way of example with reference to the accompanying drawings, in which:

Fig. 1 is a front view of an embodiment of the corrugating machine according to the present invention; and Fig. 2 is an enlarged front view of a web 2 GB2194974A 2 inlet to the double facer.

Firstly referring to Fig. 1, there are arranged on a floor 1 a first mill roll stand 2 for sup porting a pair of rolls of back linerboard, a single facer 3, a second mill roll stand 4 for supporting a pair of rolls of corrugating medium, and a third mill roll stand 5 for supporting a pair of rolls of front linerboard, from one end to the other end in this order.

The corrugating medium b is fed from the second mill roll stand 4 into the single facer 3 where it is passed between a pair of corrugating rolls 6, 6' to form corrugations and then between the lower roll 6' and a glueing unit 7 to apply glue to the top of its flutes. The back linerboard a is fed from the first mill roll stand 2 into the single facer 3 where it is assed between the lower roll 6' and a press roll 8 and bonded to the corrugated medium b to produce a single faced corrugated fiberboard A. It is then transported by a vertical conveyor 9 onto a bridge 10 provided over the single facer 3.

The bridge 10 extends from the first mill roll stand 2 to the third mill roll stand 5. The single faced corrugated fiberboard A fed onto the bridge 10 is fed to one end thereof. The path to the one end serves as an accumulating space 10a for accumulating the single faced corrugated fiberboard A. The space 10a is disposed over the first mill roll stand 2. The fiberboard A is guided up from the one end of the bridge 10 and fed around a guide roll 11 into a double facer 12 disposed over the bridge 10.

Since the fiberboard A has its direction of feed reversed by the guide roll 11, it is fed into the double facer 12 with its corrugated medium b facing downward as shown in Fig. 2 and is brought into contact with the surface of said front linerboard from the third mill roll stand. On its way to the double facer 12, a glueing unit 13 is provided where glue is applied to the top of flutes of the corrugated medium b. - On the other hand, the front linerboard c is fed from the third mill roll stand 5 toward the one end of the bridge 10 and then to the double facer 12, guided by a plurality of rol- lers 14.

The double facer 12 is arranged over the area between the first mill roll stand 2 and the second mill roll stand 4, having its web inlet located over the first mill roll stand 2. As with a conventional double facer, the double facer 12 is provided at its upper part with a cotton belt 15 and thereunder with a plurality of heaters 16 and with a conveyor belt 17.

Thus, the single faced corrugated fiberboard A and the front linerboard c are fed into the double facer 12, with the fiberboard A maintained at a comparatively high temperature, and are heated further by the heaters 16 to be bonded together to produce a double faced corrugated fiberboard B. In this operation, the heaters 16 face the front linerboard c to heat it from below. (Fig. 2) Therefore, the glue applied beforehand to the top of flutes of the corrugated medium b is efficiently dried, thus assuring a strong bond between the single faced corrugated fiberboard A and the front linerboard c.

The double faced corrugated fiberboard B produced by bonding the single faced corru- gated fiberboard A to the front linerboard c is held between the cotton belt 15 and the conveyor belt 17 to be carried out of the double facer 12. A slitter-scorer 18 and a rotary cutter 19 are provided in the path of feed of the fiberboard B over the third mill roll stand 5. The fiberboard B is slitted longitudinally and simultaneously scored by the slitter-scorer 18. It is then cut transversely by the rotary cutter 19 into a plurality of blanks S of a predeter- mined length. The blanks S are stacked on a vertically movable table 20 one upon another, and unloaded therefrom when a predetermined number of blanks S are stacked up.

Claims

1. A corrugating machine comprising a first mill roll stand for supporting rolls of a back linerboard, a single facer for producing a single faced corrugated fiberboard, a second mill roll stand for supporting rolls of a corrugating medium, a third mill roll stand for supporting rolls of a front linerboard, and a double facer for producing a double faced corrugated fiberboard, said single facer, said first, second and third mill roll stands being provided on a lower level, an accumulating space for accumulating said single faced corrugated fiberboard being disposed on an intermediate level and said double facer being arranged on an upper level, wherein said accumulating space is disposed over said first mill roll stand and said double facer is arranged in an area so that the web will be fed from the side of said first mill roll stand to the side of said second mill roll stand.

2. A corrugating machine as claimed in claim 1, wherein said single faced corrugated fiberboard fed from said accumulating space is turned upside down so that is will enter said double facer with the corrugated medium facing downward to be brought into contact with said front liner-board and bonded thereto.

3. A corrugating machine substantially as hereinbefore described with reference to the accompanying drawings.

CLAIMS Amendments to the claims have been filed, and have the following effect: 125 Claims 1 and 2 above have been deleted or textually amended. New or textually amended claims have been filed as follows: Claim 3 above has been re-numbered as 2: 130 1. A corrugating machine comprising a first t 3 GB2194974A 3 mill roll stand for supporting rolls of a back linerboard, a second mill roll stand for supporting rolls of a corrugating medium, a single facer for bonding said back linerboard and said corrugating medium together to produce a single faced corrugated fiberboard, a third mill roll stand for supporting rolls of a front linerboard, a double facer for bonding said front linerboard to said single faced corrugated fiberboard to produce a double faced corrugated fiberboard, a slitter- scorer, and a rotary cutter, said first mill roll stand, said single facer, said second mill roll stand and said third mill roll stand being arranged on a lower level in this sequence, wherein said double facer, said slitter-scorer and said rotary cutter are arranged on an upper level in this sequence, so that said double facer will receive said single faced corrugated fiberboard from said sin- gle facer and said front linerboard from said third mill roll stand at the side of said first mill roll stand and discharge said double faced corrugated fiberboard to theside of said third mill roll stand, and said single faced corru- gated fiberboard will be turned upside down when fed to said double facer with said corrugated medium facing downward to be brought into contact with said front linerboard and bonded thereto.

Published 1988 at The Patent Office, State House, 66/71 High Holborn, London WC1R 4TP. Further copies may be obtained from The Patent Office, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Burgess & Son (Abingdon) Ltd. Con. 1/87.