Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Reexamination Certificate
1997-09-12
2003-01-21
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
C493S068000, C493S160000, C493S355000, C493S356000, C493S399000
Reexamination Certificate
active
06508751
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to a method and device for preparing container board for folding. In particular, the invention concerns providing a device for displacing in a non-destructive manner the corrugated material and the liner in a portion of the container board to form a curved indentation therein and a separate creasing tool for forming a line of weakness in the liner along the indentation.
BACKGROUND OF THE INVENTION
Container board boxes are widely used for the packaging of multiple items, such as bottles, and heavier items, such as refrigerators, televisions, and other consumer goods. Container board boxes are commonly fabricated from a web of container board which has been slotted, creased, and cut into blanks. The blanks are then folded on the crease line and glued to form flattened box blanks. The box blanks are then formed into the final box shape by the packager to receive products therein.
Modern value-added package design and automated filling equipment demand that the boxes be dimensionally accurate. One of the main factors affecting the dimensional accuracy of container board boxes is the size of the box panels. Presently, box panel size is determined by mechanically scoring a crease line into the container board.
One such existing creasing device
110
is shown in FIG.
1
and includes a pair of shafts
112
. A female ring
114
is mounted on a hub
116
located on one of the creasing/scoring shafts
112
. A male ring
118
is mounted to a hub
120
located on the other creasing/scoring shaft
112
. The female ring
114
and the male ring
118
form a nip for receiving a web of container board
124
. The male ring
118
includes a male scoring bead
122
for compressing the container board
124
into the female ring
114
.
The container board
124
comprises a corrugated medium
126
interposed between an inner liner board
128
and an outer liner board
130
. The male scoring bead
122
forms a crease line
132
(best seen in
FIG. 2
) in the inner liner
128
and the corrugated medium
126
at the nip between the male and female rings
114
and
118
. The crease line
132
separates the container board
124
into side-by-side panels, such as an inboard panel
134
and an outboard panel
136
.
There is a critical value of nip pressure that must be maintained in order to produce a useful crease line
132
. Too little nip pressure produces an undefined crease line, whereas too much pressure tends to cut or crack the liner paper of the liner boards
128
and
130
.
After the crease line
132
is formed, the outboard panel
136
is urged down around the crease line
132
either by a rotating folding rod
138
or moving belt (not shown). By nature, folding a container board sheet requires the outer liner board
130
to stretch, the inner liner board
128
to contract, and the corrugating medium
126
to compress.
Due to the many variables encountered in the manufacture of container board boxes, such as liner and medium paper weights, moisture content, and recycled grades, the flutes of the corrugated medium
126
adjacent to the crease line
132
may be weaker than the crease line
132
itself and frequently causes the outboard panel
136
to fold about a “false” score line
140
. These false score lines
140
, also known as “rolling scores”, change the dimension of the panels
134
and
136
on either side of the false score
140
, producing a container board box that is dimensionally not within specification. Since the dimensions of the panels are different from the design dimensions, the container blank forms a parallelogram when folded and not the intended rectangular shape. The false score lines
140
can occur at anytime during a production run of boxes and are very difficult to eliminate with normal machine set-up functions.
SUMMARY OF THE INVENTION
The present invention substantially eliminates the occurrences of “rolling scores” by displacing paper in a controlled non-destructive manner before the container board is creased to produce the necessary clearances required to permit accurate bending of the panels around the “true” crease line.
The present invention includes a device for displacing in a non-destructive manner the corrugated medium and at least one of the liners in a portion of the board to form a curved indentation therein. A crease or line of weakness is then formed in the liner along the curved indentation of the board.
It is contemplated that the device can comprise a rotatably supported backing ring and a cooperating rotatably supported forming ring with a peripheral face having a curved profile. The container board is received between the nip formed between the peripheral faces of the forming and the backing rings. The curved profile of the forming ring cooperates with the peripheral face of the backing ring to displace the corrugated medium and at least one of the liners to form the curved indentation therein.
It is further contemplated that the device imparts to the container board a curved indentation having a parabolic shape.
In one form of the invention the profile of the peripheral face of the forming ring has a radius of about six inches (15.24 cm) and a width of about one inch (2.54 cm). The peripheral face of the backing ring has a substantially flat profile and is at least about two inches (5.08 cm) wide.
Additional features and advantages of the invention will become apparent to those skilled in the art upon consideration of the following detailed description of the preferred embodiment as amplifying the best mode of carrying out the invention as presently perceived. The detailed description particularly refers to the accompanying drawings.
REFERENCES:
patent: 1000139 (1911-01-01), Wyman
patent: 1302831 (1919-05-01), Naugler
patent: 1494604 (1924-05-01), Jones
patent: 1591062 (1926-07-01), Smith
patent: 1600396 (1926-09-01), Campbell et al.
patent: 1605518 (1926-11-01), Davis
patent: 1687683 (1928-10-01), Mogel
patent: 1737553 (1929-12-01), Andrews
patent: 1828234 (1931-10-01), Swift
patent: 1893554 (1933-01-01), Knowlton
patent: 1941484 (1934-01-01), Nasmith
patent: 1959424 (1934-05-01), Hawkins
patent: 2117460 (1938-05-01), Staude
patent: 2176147 (1939-10-01), Palmer
patent: 2575257 (1951-11-01), Boulware
patent: 2657044 (1953-10-01), Apgar
patent: 2765716 (1956-10-01), Andersson
patent: 2982186 (1961-05-01), McKeen
patent: 3163095 (1964-12-01), Sheeran
patent: 3314339 (1967-04-01), Guffy
patent: 3318206 (1967-05-01), Kuehn
patent: 3526566 (1970-09-01), McIlvain, Jr. et al.
patent: 3604317 (1971-09-01), Braun
patent: 3619318 (1971-11-01), Shultz
patent: 3735674 (1973-05-01), Haddock
patent: 3786708 (1974-01-01), Mumper
patent: 3910170 (1975-10-01), Boy
patent: 4041849 (1977-08-01), Tsukasaki
patent: 4090384 (1978-05-01), Wootten
patent: 4170674 (1979-10-01), Matsuki
patent: 4242172 (1980-12-01), Fujii
patent: 4254692 (1981-03-01), Sardella
patent: 4268555 (1981-05-01), Kantz
patent: 4286006 (1981-08-01), Boelter
patent: 4596541 (1986-06-01), Ward
patent: 4605210 (1986-08-01), Hechler
patent: 4708708 (1987-11-01), Fries, Jr.
patent: 4711797 (1987-12-01), Niske
patent: 4784269 (1988-11-01), Griffith
patent: RE32817 (1989-01-01), Vossen
patent: 4816015 (1989-03-01), Holder
patent: 4854927 (1989-08-01), Reneau et al.
patent: 4946430 (1990-08-01), Kohmann
patent: 5002524 (1991-03-01), Mills
patent: 5169651 (1992-12-01), Heiber
patent: 5207632 (1993-05-01), Brunlid
patent: 5215516 (1993-06-01), Stutt
patent: 5250018 (1993-10-01), Chung et al.
patent: 5266148 (1993-11-01), Keech
patent: 5332458 (1994-07-01), Wallick
patent: 5356364 (1994-10-01), Weith
patent: 5393295 (1995-02-01), Knecht
patent: 5429577 (1995-07-01), Simpson
patent: 5466211 (1995-11-01), Komarek et al.
patent: 5582571 (1996-12-01), Simpson
patent: 5641551 (1997-06-01), Simpson
patent: 5690601 (1997-11-01), Cummings
The Langston Corporation's 3797 Saturn Pre-Creaser Assembly, Drawing No. 425675, which was known before the filing date of the present application.
The Langston Corporation's brochure for the Saturn III flexo fold
Patragnoni Albert James
Target Richard P.
Weishew Joseph John
Kim Eugene
Mouzavires William E.
Sun Source l LLC
LandOfFree
Method and apparatus for preforming and creasing container... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for preforming and creasing container..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for preforming and creasing container... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3044786