Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1998-05-05
2001-12-04
Ball, Michael W. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S064000, C156S360000, C156S361000, C156S378000, C156S470000
Reexamination Certificate
active
06325881
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The present invention relates to a phase control method and system for, when manufacturing a corrugated fiberboard sheet composed of a plurality of corrugated core paper layers, controlling a phase shift between the core paper.
2) Description of the Related Art
FIG. 6
is a cross sectional view showing a corrugated fiberboard sheet comprising a plurality of (for example, 2) core paper layers, and a double-faced corrugated fiberboard sheet S shown in
FIG. 6
is made by adhering core paper C
1
, C
2
constituting two layers to each other in a laminated (piled-up) condition between a pair of upper and lower liners L
1
, L
2
. The two core paper C
1
, C
2
have crests (mountains) different in heights H
1
, H
2
(>H
1
) from each other, respectively, with the crests forming corrugated configurations with the same pitch P
o
.
Referring to
FIG. 7
, a description will be made hereinbelow of an apparatus for manufacturing the double-faced corrugated fiberboard sheet S shown in FIG.
6
.
FIG. 7
is a side elevational view illustratively and schematically showing a construction of a common corrugated fiberboard sheet manufacturing apparatus for manufacturing a double-faced corrugated fiberboard sheet S comprising two core paper C
1
, C
2
layers.
In
FIG. 7
, omitted is a first single facer for manufacturing a single-faced corrugated fiberboard sheet S
1
in a manner that the first core paper C
1
shaped into a corrugated configuration is adhered onto the liner L
1
, but shown is a second single facer SF
2
for manufacturing a two-layer core single-faced corrugated fiberboard sheet S
2
in a manner of adhering the second core paper C
2
having a corrugated configuration with the same pitch as that of the first core paper C
1
onto the single-faced corrugated fiberboard sheet S
1
in a laminated condition, and further shown is a double facer DF for manufacturing a double-faced corrugated fiberboard sheet S in a way of adhering the liner L
2
onto the two-layer core single-faced corrugated fiberboard sheet S
2
manufactured by the second single facer SF
2
.
The second single facer SF
2
is composed of guide rolls
1
,
2
, preheating rolls
3
,
4
, an endless pressure belt
5
, drive rolls
6
,
7
, an upper roll
8
, a lower roll
9
, a paste reservoir
10
and paste applying rolls
11
,
12
.
The guide rolls
1
,
2
and the preheating rolls
3
,
4
are for the purpose of guiding the single-faced corrugated fiberboard sheet S
1
coming from the non-shown first single facer to between the pressure belt
5
and the upper roll
8
, while the preheating rolls
3
,
4
also have a function to preheat the single-faced corrugated fiberboard sheet S
1
.
The endless pressure belt
5
is wound around the drive rolls
6
,
7
to be rotationally driven therethrough. In addition, the upper roll
8
is placed into contact with the endless pressure belt
5
stretched between the drive rolls
6
,
7
to pressurize it from the below. Moreover, under the upper roll
8
, there is disposed the lower roll
9
for shaping the second core paper C
2
into a corrugated configuration in a manner that the second core paper C
2
is put between the upper roll
8
and the lower roll
9
.
The paste reservoir
10
holds a paste to be used for adhering the second core paper C
2
onto the single-faced corrugated fiberboard S
1
, and the paste applying rolls
11
,
12
apply the paste within the paste reservoir
10
onto peak portions of the crests of the second core paper C
2
shaped into a corrugated configuration in a manner of being put between the upper roll
8
and the lower roll
9
.
Between the endless pressure belt
5
and the upper roll
8
, there is interposed the single-faced corrugated fiberboard S
1
, and at the same time, there is put the second core paper C
2
shaped into a corrugated configuration between the upper roll
8
and the lower roll
9
and undergoing the paste application. In this way, the second core paper C
2
is pasted on the single-faced corrugated fiberboard sheet S
1
, thus manufacturing the two-layer core single-faced corrugated fiberboard sheet S
2
.
Furthermore, the second single facer SF
2
is provided with a tension adjusting unit
17
for adjusting a tension to be given to the single-faced corrugated fiberboard sheet S
1
. The tension adjusting unit
17
is, for example, made up of a suction box (not shown) for sucking the single-faced corrugated fiberboard sheet S
1
from the liner L
1
side, with the tension to the single-faced corrugated fiberboard sheet S
1
being adjusted by the adjustment of that suction force (the frictional resistance force for the single-faced corrugated fiberboard sheet S
1
).
In addition, provided is a pulse sensor
22
for sensing, as a pulse signal, the crests of the first core paper C
1
of the single-faced corrugated fiberboard sheet S
1
to be interposed between the endless pressure belt
5
and the upper roll
8
, and further provided is a pulse sensor
23
for sensing, as a pulse signal, the crests of the second core paper C
2
to be put between the endless pressure belt
5
and the upper roll
8
. These pulse sensors
22
,
23
constitute a phase shift measuring unit
18
for measuring a phase shift quantity &dgr; between the crests of the first core paper C
1
and the crests of the second core paper C
2
.
On the basis of the phase shift quantity &dgr; measured by the phase shift measuring unit
18
, a tension control unit
19
controls the tension to the single-faced corrugated fiberboard sheet S
1
through the tension adjusting unit
17
so that the phase shift quantity &dgr; becomes zero. An tension control operation by this tension control unit
19
will be described herein later with reference to
FIGS. 8 and 9
.
Incidentally, in fact, the tension control unit
19
adjusts the suction force to the single-faced corrugated fiberboard sheet S
1
caused by the suction box organizing the tension adjusting unit
17
, so that the single-faced corrugated fiberboard sheet S
1
is adjustable to achieve the adjustment of the phase of the first core paper C
1
on the single-faced corrugated fiberboard sheet S
1
side.
On the other hand, the two-layer core single-faced corrugated fiberboard sheet S
2
manufactured by the second signal facer SF
2
is guided by the guide rolls
13
a
,
13
b
toward a double facer DF. This double facer DF is composed of pressure rolls
15
,
16
, and the two-layer core single-faced corrugated fiberboard sheet S
2
, together with the liner L
2
guided by a guide roll
14
, is placed between the pressure rolls
15
,
16
, thus manufacturing the double-faced corrugated fiberboard sheet S.
In the corrugated fiberboard sheet manufacturing apparatus thus constructed, the single-faced corrugated fiberboard sheet S
1
produced by the first single facer (not shown) is conveyed through a path (not shown) to the second single facer SF
2
.
In this second single facer SF
2
, the single-faced corrugated fiberboard sheet S
1
is guided by the guide rolls
1
,
2
and the preheating rolls
3
,
4
to be delivered to between the pressure belt
5
and the upper roll
8
. The single-faced corrugated fiberboard sheet S
1
is preheated when passing through the outer circumferences of the preheating rolls
3
,
4
.
On the other hand, the second core paper C
2
is shaped into a corrugated configuration when passing through between the upper roll
8
and the lower roll
9
in a state of being interposed therebetween, and after a paste is applied onto the crest peak portions of the corrugated configuration by means of the paste applying rolls
11
,
12
, the second core paper C
2
, together with the single-faced corrugated fiberboard sheet S
1
, is conveyed to between the pressure roll
5
and the upper roll
8
. Further, the single-faced corrugated fiberboard sheet S
1
and the second core paper C
2
, being in a laminated condition, are subjected to given heating and pressing force, so that the second core paper C
2
is adhered onto with the single-faced corrugated fiberboard sheet S
1
,
Ando Makoto
Ishibuchi Hiroshi
Kohno Kazukiyo
Seki Yukuharu
Wakusawa Kuniaki
Armstrong Westerman Hattori McLeland & Naughton LLP
Ball Michael W.
Mitsubishi Heavy Industries Ltd.
Piazza Gladys
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