Flexible bags – Wall details – Pleated or gusseted
Reexamination Certificate
2002-01-23
2004-02-17
Pascua, Jes F. (Department: 3727)
Flexible bags
Wall details
Pleated or gusseted
C383S121000, C383S104000
Reexamination Certificate
active
06692148
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an apparatus for successively making plastic bags.
PRIOR ART
There has been recently requested to successively make plastic bags each of which is completed with first and second gusset portions and a bottom gusset portion. The plastic bag includes two layers of panel portion superposed to define aligned top edges, first and second side edges and bottom edges. The first side gusset portion is disposed between the first side edges to extend therealong. The second side gusset portion is disposed between the second side edges to extend therealong. Each of the first and second side gusset portions is folded into halves along a center line extending longitudinally thereof, superposed into two layers and interposed between the layers of panel portion. The first side edges are connected with each other by the first side gusset portion, the second side edges being connected with each other by the second side gusset portion.
On the other hand, the bottom gusset portion is disposed between the bottom edges to extend therealong. The bottom gusset portion is also folded into halves along a center line extending longitudinally thereof, superposed into two layers and interposed between the layers of panel portion. The bottom edges are connected with each other by the bottom gusset portion. In addition, the bottom gusset portion has first and second ends at which first and second auxiliary gusset portions are formed. Each of the first and second auxiliary gusset portions is folded from the layers of bottom gusset portion along folded lines extending at an angle of about 45° with respect to the center line of bottom gusset portion. The first auxiliary gusset portion is further folded into halves along a center line which is an extension of the center line of bottom gusset portion, to be superposed into two layers one of which is interposed along with one of the layers of bottom gusset portion between one of the layers of panel portion and one of the layers of first side gusset portion. The other layer of first auxiliary gusset portion is folded along with the other layer of bottom gusset portion between the other layer of panel portion and the other layer of first side gusset portion. The first side gusset portion is connected with the bottom gusset portion by the first auxiliary gusset portion. The second auxiliary gusset portion is further folded into halves along a center line which is an extension of the center line of bottom gusset portion, to be superposed into two layers one of which is interposed along with one of the layers of bottom gusset portion between one of the layers of panel portion and one of the layers of second side gusset portion. The other layer of second auxiliary gusset portion is folded along with the other layer of bottom gusset portion between the other layer of panel portion and the other layer of second side gusset portion. The second side gusset portion is connected with the bottom gusset portion by the second auxiliary gusset portion.
Accordingly, the plastic bag is advantageous in that the first and second side gusset portions can be unfolded between the first and second side edges respectively to obtain a large capacity. The bottom gusset portion and the first and second auxiliary gusset portions can also be unfolded between the bottom edges to constitute a rectangular bottom. The plastic bag can therefore stably stand on a table.
However, it has been heretofore difficult to successively the plastic bags.
It is therefore an object of the invention to provide a new and improved apparatus for successively making plastic bags each of which is completed with first and second side gusset portions and a bottom gusset portion.
SUMMARY OF THE INVENTION
According to the invention, an apparatus is arranged to successively make plastic bags each of which includes two layers of panel portion superposed to define aligned top edges, first and second side edges and bottom edges. The plastic bag further includes a first side gusset portion disposed between and extending along the first side edges, a second side gusset portion disposed between and extending along the second side edges, and a bottom gusset portion disposed between and extending along the bottom edges.
The apparatus comprises feeding means for feeding a main material intermittently for a length along a feeding path. The main material comprises the layers of panel portion and the first and second side gusset portions continuing longitudinally thereof respectively, the feeding means feeding the main material longitudinally of the layers of panel portion and the first and second side gusset portions. The apparatus further comprises cutting means disposed at a position predetermined along the feeding path for cutting one of the layers of panel portion as well as the first and second side gusset portions widthwise of the main material and leaving the other layer of panel portion continuing, to form an opening in the main material, whenever feeding the main material intermittently. The apparatus further comprises inserting means disposed downstream of the cutting means along the feeding path for inserting an additional material between the layers of panel portion through the opening, whenever feeding the main material intermittently. The additional material comprises the bottom gusset portion.
In a preferred embodiment, the cutting means comprises a Thomson blade extending widthwise of and opposed to one of the layers of panel portion. The cutting means further comprises drive means for moving the Thomson blade toward one of the layers of panel portion to cut one of the layers of panel portion as well as the first and second side gusset portions widthwise of the main material.
Each of the first and second side gusset portions is folded into halves along a center line extending longitudinally thereof, superposed into two layers and interposed between the layers of panel portion. The first side edges are connected with each other by the first side gusset portion, the second side edges being connected with each other by the second gusset portion. The bottom gusset portion is folded into halves along a center line extending longitudinally thereof, superposed into two layers and interposed between the layers of panel portion. The bottom edges are connected with each other by the bottom gusset portion. In addition, the bottom gusset portion has first and second ends at which first and second auxiliary gusset portions are formed. Each of the first and second auxiliary gusset portions is folded from the layers of bottom gusset portion along folded lines extending at an angle of about 45° with respect to the center line of bottom gusset portion. The first auxiliary gusset portion is further folded into halves along a center line which is an extension of the center line of bottom gusset portion, to be superposed into two layers one of which is interposed along with one of the layers of bottom gusset portion between one of the layers of panel portion and one of the layers of first side gusset portion. The other layer of first auxiliary gusset portion is interposed along with the other layer of bottom gusset portion between the other layer of panel portion and the other layer of first side gusset portion. The first side gusset portion is connected with the bottom gusset portion by the first auxiliary gusset portion. The second auxiliary gusset portion is further folded into halves along a center line which is an extension of the center line of bottom gusset portion, to be superposed into two layers one of which is interposed along with one of the layers of bottom gusset portion between one of the layers of panel portion and one of the layers of second side gusset portion. The other layer of second auxiliary gusset portion is interposed along with the other layer of bottom gusset portion between the other layer of panel portion and the other layer of second side gusset portion. The second side gusset portion is connected with the bottom gusset portion by the second auxiliary gusset p
Pascua Jes F.
Totani Corporation
Westerman Hattori Daniels & Adrian LLP
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