Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1999-09-30
2002-10-29
Morris, Terrel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S040100, C428S041800, C428S042300, C428S906000, C428S131000, C428S136000
Reexamination Certificate
active
06472064
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tab for temporarily fixing a paper web end portion of a paper roll for use with, for example, a rotary press, in order to prevent unwinding of the paper roll.
2. Description of the Related Art
In, for example, a rotary press, a paper web is fed downstream from a paper roll loaded in a web feeder. When a paper web end of the paper roll is approached, a paper web end portion of a new paper roll is affixed to the currently fed paper web, so that the feed of paper web is not interrupted. In order to achieve this affixing, the paper web end portion of the new paper roll is provided with a special device.
Specifically, as shown in
FIG. 7
, after a paper web end of a paper roll
52
is cut straight or into a chevron shape, an end portion
50
of paper web of the paper roll
52
is affixed to the surface of the paper roll
52
by means of tabs t in order to prevent unwinding of the paper roll
52
. Further, a pressure-sensitive double-sided adhesive tape
51
is affixed to the end portion
50
along its end edge.
Conventional tabs used to temporarily fix the end portion of a paper roll as described above are disclosed in, for example, Japanese Utility Model Application Laid-Open (kokai) Nos. 4-117854 and 5-12440 and Japanese Patent Application Laid-Open (kokai) No. 10-114452.
FIGS. 8A and 8B
show a tab ta disclosed in Japanese Utility Model Application Laid-Open (kokai) No. 4-117854 “Tab for Fixing Paper Web End Portion of Paper Roll.” In this tab ta, a nonadhesive portion
66
is formed at a central portion of a base sheet
53
, and adhesive layers
54
and
55
are provided between the nonadhesive portion
66
and the upper edge of the base sheet
53
and between the nonadhesive portion
66
and the lower edge of the base sheet
53
, respectively. Further, perforations
56
are formed in the nonadhesive portion
66
such that the perforations extend at intervals of, for example, about 1 mm between the side edges of the nonadhesive portion
66
.
The adhesive layers
54
and
55
of a plurality of tabs ta are affixed to the paper roll
52
such that the perforations
56
are aligned with the end edge of the end portion
50
of the paper roll
52
, thereby temporarily fixing the end portion
50
on the paper roll
52
. When the paper web of a new paper roll
52
is to be joined to the paper web currently being fed (hereinafter called the “currently fed paper web”), the pressure-sensitive double-sided adhesive tape
51
adhering to the end portion
50
of the new paper roll
52
is affixed to the currently fed paper web. As a result, each of the base sheets
53
is torn apart, along the perforations
56
, into upper and lower pieces, so that the end portion
50
of the new paper roll
52
is released from temporary fixation.
FIGS. 9A and 9B
show a tab tb disclosed in Japanese Patent Application Laid-Open (kokai) No. 10-114452 “Tape to Prevent Unwinding of Paper Web End of Paper Roll.” This tab tb is formed of an adhesive tape
57
, and a plurality of slits
58
are formed at equal intervals along the opposite side edges of the adhesive tape
57
.
A plurality of tabs tb are affixed to the paper roll
52
such that the side edges thereof cross the end edge of the end portion
50
of the paper roll
52
substantially perpendicularly, thereby temporarily fixing the end portion
50
on the paper roll
52
. When the paper web of a new paper roll
52
is to be joined to currently fed paper web, the pressure-sensitive double-sided adhesive tape
51
adhering to the end portion
50
of the new paper roll
52
is affixed to the currently fed paper web. As a result, each of the adhesive tapes
57
serving as the tabs ta is torn apart, along appropriate slits
58
, into upper and lower pieces, so that the end portion
50
of the new paper roll
52
is released from temporary fixation.
FIGS. 10A and 10B
show a tab tc disclosed in Japanese Utility Model Application Laid-Open (kokai) No. 5-12440 “Tab for Temporarily Fixing Paper Web End Portion of Paper Roll.” In this tab tc, slits
60
are provided at a central portion between the upper and lower edges of a base sheet
59
and extend at appropriate intervals between the side edges thereof. An upper piece
61
is defined between the slits
60
and the upper edge of the base sheet
59
, and a lower piece
62
is defined between the slits
60
and the lower edge of the base sheet
59
. Adhesive layers
63
and
64
are provided on the back surfaces of the upper and lower pieces
61
and
62
, respectively, in order to temporarily fix an end portion of a paper roll. Further, an adhesive layer
65
is provided on the front surface of the upper piece
61
in order to join paper webs.
The tab tc is mainly used for fixation of the vertex of an unillustrated chevron-shaped end portion of a paper roll. The adhesive layers
63
and
64
of the tab tc are affixed to the paper roll such that the slits
60
are aligned with the vertex of the chevron-shaped end portion of the paper roll, thereby temporarily fixing the chevron-shaped end portion on the paper roll. When the paper web of a new paper roll is to be joined to the currently fed paper web, the adhesive layer
65
is affixed to the currently fed paper web. As a result, the base sheet
59
is torn apart, along the slits
60
, into the upper and lower pieces
61
and
62
, so that the chevron-shaped end portion of the new paper roll is released from temporary fixation.
The tab ta disclosed in Japanese Utility Model Application Laid-Open (kokai) No. 4-117854 involves the following problem. When the paper roll
52
of FIG.
7
—whose straight end portion
50
is temporarily fixed by an appropriate number of tabs ta of
FIGS. 8A and 8B
arranged at appropriate intervals—is rotated acceleratedly and subjected to joining to the currently fed paper web by means of the pressure-sensitive double-sided adhesive tape
51
, a tensile force is concentrated on the perforations
56
of all the tabs ta.
The perforations
56
of each tab ta subjected to the tensile force tend to be torn intermittently. Also, when the tensile force is exerted concurrently on all the tabs ta, the tabs ta tend to be torn intermittently. Accordingly, impact forces associated with the tearing of the individual tabs ta may not be exerted uniformly on the currently fed paper web with respect to its width direction; in other words, the impact forces may be exerted on the currently fed paper web in an unbalanced manner. As a result, the end portion
50
of the paper roll
52
and the currently fed paper wed adhering to the end portion
50
may both tear or deform, potentially failing to join together. Since the tabs ta adhering to the paper roll
52
are not torn smoothly as described above, use of the tabs ta involves poor reliability in joining paper webs.
In order to sequentially tear a plurality of tabs ta, a paper web end of the paper roll
52
may be cut obliquely with respect to the axis of the paper roll
52
, and the tabs ta may be affixed to the oblique end portion of the paper roll
52
. For example, as shown in
FIG. 12
, a plurality of tabs ta may be affixed to an oblique end portion
67
such that the perforations
56
thereof are substantially in parallel with the end portion
67
, thereby temporarily fixing the end portion
67
on the paper roll
52
. In this case, however, during the accelerated rotation of the paper roll
52
, an air current arises around the rotating paper roll
52
; thus, the resultant wind tends to enter beneath the nonadhesive portions
66
of the tabs ta. This causes entry of the wind beneath the end portion
67
. As a result, the end portion
67
floats up in the air, and the tabs ta may be torn out before the joining of paper webs is completed, potentially resulting in unwinding of the paper roll
52
.
In order to avoid the above-mentioned influence of an air current which arises around the rotating paper roll
52
during the accelerated rotation of the paper roll
52
and to sequentially tear a plurality of tabs ta a
Aoki Katsumi
Kitai Mitsuo
Ogawa Yukio
Armstrong Westerman & Hattori, LLP
Morris Terrel
Tokyo Kikai Seisakusho Ltd.
Wachtel Alexis
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