Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With bending – folding – winding – or wrapping means
Reexamination Certificate
2001-10-18
2003-11-18
Sells, James (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With bending, folding, winding, or wrapping means
C156S205000, C156S210000, C156S498000
Reexamination Certificate
active
06648042
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a load-applying device for a double facer of a corrugator that manufactures corrugated board sheets.
2. Prior Art
In corrugated board sheets, a liner and a core paper are fed out on the upstream side of a corrugator, and after the core paper has been corrugated with a desired flute by a single facer, the core paper is pasted to the liner, thus manufacturing a continuous single-faced corrugated board sheet. Then, as shown in
FIG. 19
, the single-faced corrugated board sheet and a back liner are pasted together in a double facer
1
. Thus, a continuous corrugated board sheet S is formed. Afterward, this sheet is cut and trimmed to desired dimensions by a slitter-scorer and/or cutter (not shown), stacked by a stacker, etc. and then sent to a box-making process or shipping.
As seen from
FIG. 19
, the double facer
1
is comprised of two sections: a heating section
2
and a cooling section
3
.
An upper conveyor belt
4
and a lower conveyor belt
5
which hold and convey the corrugated board sheet S passing through the double facer
1
are provided so as to introduce a single-faced corrugated board sheet conveyed from the upstream side and a liner into the double facer
1
, cause the sheet and liner to pass through the double facer
1
, and then convey the sheet and liner to a slitter-scorer or cutter (not shown) of a downstream process.
The upper conveyor belt
4
is mounted on a driving roll
6
, an introduction roll
7
and tension rolls
8
a
and
8
b
. The driving roll
6
is disposed above the running corrugated board sheet S on the downstream side of the double facer
1
. The introduction roll
7
is disposed on the upstream side of the double facer
1
. The tension rolls
8
a
and
8
b
are disposed above the double facer
1
at intermediate points in the conveying direction. The upper conveyor belt
4
is driven by the driving roll
6
.
The lower conveyor belt
5
is mounted on a driving roll
9
, an introduction roll
10
and a tension roll
11
. The driving roll
9
is disposed beneath the running corrugated board sheet S on the downstream side of the double facer
1
. The introduction roll
10
is disposed on the upstream side of the cooling section
3
at an intermediate point in the conveying direction of the double facer
1
. The tension roll
11
is disposed beneath the double facer
1
at an intermediate point (with respect to the conveying direction) between the introduction roll
10
and the driving roll
9
. The lower conveyor belt
5
is driven by the driving roll
9
.
The upper conveyor belt
4
and the lower conveyor belt
5
are controlled by a driving device (not shown) and a control device (not shown) which controls the driving device, so that the driving rolls
6
and
9
rotate in synchronization with each other.
In the heating section
2
of the double facer
1
, a pressing device
12
is disposed above the corrugated board sheet S. Also, a heating device
15
is disposed beneath the corrugated board sheet S.
The pressing device
12
includes a means in which a plurality of weight rolls are disposed in the sheet conveying direction, and pressure is applied to the running corrugated board sheet S via the upper conveyor belt
4
by the weight of the weight rolls. The pressing device
12
further includes a means such as that shown in FIG.
19
. In this pressing means, a plurality of devices, in which a plate
14
is driven by a driving member
13
so that pressure is applied to the corrugated board sheet S via the upper conveyor belt
4
, are disposed in the sheet conveying direction, and the running corrugated board sheet S is pressed by the pressing force of these pressing devices via the upper conveyor belt
4
.
Numerous patent applications have been filed on such pressing means, etc. including, for instance, Japanese Patent Application Laid-Open (Kokai) Nos. 6-328596, 8-109590, and 2000-62055.
In the heating device
15
, a plurality of heating plates which are heated by high-temperature steam or heating plates which cause induction heating of the corrugated board sheet by means of induction heating devices, etc., are disposed in the sheet conveying direction. In addition, the single-faced corrugated board sheet and liner that are conveyed from the upstream side are heated by the heating members
16
of the heating device
15
so that the glue is gelled and bonding occurs.
The corrugated board sheet S is formed as a result of the bonding of the single-faced corrugated board sheet and liner by the action of the pressing device
12
and heating device
15
. Then, when the corrugated board sheet S has passed through the heating section
2
, the sheet S enters the cooling section
3
.
In the cooling section
3
of the double facer
1
, a plurality of weight rolls
18
of a load-applying device
17
are disposed above the corrugated board sheet S in the sheet conveying direction, and the cooling section
3
is constructed so that the weights of the respective weight rolls
18
are applied to the corrugated board sheet S via the upper conveyor belt
4
. A conveying supporting device
19
is comprised of a plurality of conveying rolls
20
. The conveying rolls
20
are disposed in the sheet conveying direction beneath the corrugated board sheet S and support the corrugated board sheet S from below.
The heated corrugated board sheet S conveyed from the heating section
2
is held and conveyed by the upper conveyor belt
4
and lower conveyor belt
5
. While the corrugated board sheet S passes through the cooling section
3
, the corrugated board sheet S is pressed by the weight rolls
18
while being supported by the weight rolls
18
and conveying rolls
20
. The final bonding is thus accomplished, and the heated corrugated board sheet S is cooled.
In the load-applying device
17
of the cooling section
3
, instead of the weight rolls
18
, a means that presses the corrugated board sheet S via the upper conveyor belt
4
using the pressing device disclosed in the above-described Japanese Patent Application Laid-Open (Kokai) No. 6-328596 may be used.
When the corrugated board sheet S has passed through the cooling section
3
, the corrugated board sheet S leaves the double facer
1
. The corrugated board sheet S is conveyed to a slitter-scorer or cutter (not shown) of a downstream process, and then the sheet is cut and trimmed to a desired size.
In a conventional double facer, the corrugated board sheet S is pressed by weight rolls from above. However, the weight rolls are rotatably shaft-supported on side frames (not shown) of the double facer
1
. They are individually adjusted so that the rolls are parallel with respect to the direction of width of the machine, and so that the height between the respective weight rolls is also uniform. Furthermore, the side frames are raised and lowered in accordance with the flute of the corrugated board sheet S that is to be produced. Accordingly, the weight rolls are raised and lowered in accordance with the raising and lowering movements of the side frames, so that the corrugated board sheet S is pressed.
However, the problem is that in regard to the work of attaching these weight rolls to the side frames of the double facer, time and effort are required for assembly. Also the adjustments that are made require experience and are not easily accomplished. Thus, the adjustment work is a burden on the assembly workers.
Furthermore, in recent corrugators, there has been a progressive increase in the size and speed of the machinery, and double facers also have a machine width of 2500 mm to 2800 mm. In addition, high-speed corrugators in which the speed ranges from 350 meters per minute to 400 meters per minute have also appeared. Accordingly, in order to heat-bond and cool the corrugated board sheet by means of a double facer, the double facer itself must be constructed with a long machine length.
When the machine length and machine width of the double facer are thus increased, adjustment of the weight rolls on an individual basis in
Saito Hiroshi
Umemura Masami
Kabushiki Kaisha Isowa
Koda & Androlia
Sells James
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