Package making – Methods – Forming or partial forming a receptacle and subsequent filling
Reexamination Certificate
2000-08-08
2003-02-11
Sipos, John (Department: 3721)
Package making
Methods
Forming or partial forming a receptacle and subsequent filling
C053S468000, C053S469000, C053S492000, C053S384100, C053S385100
Reexamination Certificate
active
06516587
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a bag opening method and more particularly to a plastic bag opening method for opening plastic bags, one by one, where each of the bags has one edge of its opening portion elongated, the edge so elongated is provided with two pin holes and a multiplicity of the bags are held together in a multi-layer state with a pin being inserted into the pin holes.
2. Description of the Prior Art
In a packaging device for making packages by filling goods in plastic bags for packaging purpose, it is necessary to open the bags, one by one, out of a multiplicity of the bags held together in a multi-layer state. In order to facilitate operation to open the bags, one by one, out of the multi-layered bags for packaging purpose, it is so done conventionally, as shown in
FIG. 5
, that a bag
01
is formed having one edge
02
of its opening portion elongated, the edge
02
so elongated is provided with two pin holes
03
, a pin
04
is inserted into the pin holes
03
so that a multiplicity of the bags
01
are held together in a multi-layer state and the bags
01
in the multi-layer state are opened, one by one, so that goods may be filled therein.
When the bags
01
held with the pin
04
being inserted into the pin holes
03
, as shown in
FIG. 5
, are opened, one by one, to be used for packaging, each of the bags
01
so opened must be released from the pin
04
. Conventionally, it is so done that while the pin
04
is inserted into the pin holes
03
, goods are filled in the bag
01
and the bag
01
at the portion of the pin holes
03
is torn off by a force acting at the time of packaging or the like.
In this case, even though the bag
01
is torn off at the portion of the pin holes
03
, as the plastic bag or the like has a considerable tensile strength, there is provided a perforated line or cut portion
05
in the portion of the pin holes
03
so that the bag
01
may be torn off easily at the portion of the pin holes
03
. But, if the perforated line or cut portion
05
is made excessively, the bag
01
will be immediately torn off so that goods filling operation may be obstructed, or if the perforated line or cut portion
05
is made insufficiently, the bag
01
will be hardly torn off so that goods filling operation may be also obstructed.
Thus, in the prior art where each of the bags
01
has one edge
02
of its opening portion elongated, the edge
02
is provided with the two pin holes
03
and the multiplicity of the bags
01
are held together with the pin
04
being inserted into the pin holes
03
, there has been a considerable difficulty in the operation to open the bags
01
, one by one, so as to fill goods therein.
Also, even if the bag
01
is torn off well at the portion of the pin holes
03
, there are often remaining torn fractions in the portion of the pin holes
03
of the bag
01
so torn off and by such bag
01
, no good outside appearance of the packaged commercial goods is obtained, which has been a large problem in the bag package of this type.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a plastic bag opening method for opening plastic bags, one by one, without tearing them at the portion of pin holes, where each of the bags has one edge of its opening portion elongated, the edge so elongated is provided with two pin holes and a multiplicity of the bags are held together with a pin being inserted into the pin holes.
In order to attain the mentioned object, the present invention provides a plastic bag opening method for opening plastic bags, one by one, where each of the plastic bags has one edge of its opening portion elongated, the edge so elongated is provided with two pin holes and the plastic bags are held together with a pin being inserted into the pin holes, characterized in comprising steps of; causing a pin, having its upper end free, to be inserted into the pin holes so as to hold the plastic bags together; while pressing the edges so elongated of the plastic bags at a portion between the two pin holes, blowing air from obliquely above toward an opening portion of a plastic bag of the top of the plastic bags so as to form an opening of the plastic bag; and inserting an opening member into the opening of the plastic bag so as to enlarge the opening.
In the plastic bag opening method according to the present invention, where each of the plastic bags has one edge of its opening portion elongated and the edge so elongated is provided with the two pin holes, the edges of the plastic bags, lapped one on another in a multi-layer state, are pressed at the portion between the two pin holes and air is blown from obliquely above toward the opening portion of the plastic bag of the top of the multi-layered plastic bags, hence the plastic bag of the top is opened partially to form an opening as it is held in the multi-layer state.
Then, the opening member, which is enlargeable upward/downward and/or rightward/leftward, is inserted into the opening so formed to enlarge the opening and the edge so elongated on the lower side of the plastic bag is lifted up, except the portion so pressed between the two pin holes, thereby the edge at the portion of the pin holes comes out of the pin which has its upper end free.
REFERENCES:
patent: 3538671 (1970-11-01), Wallace
patent: 3678652 (1972-07-01), Panasewicz
patent: 3685252 (1972-08-01), Wouda
patent: 3715857 (1973-02-01), Fronczak
patent: 3727374 (1973-04-01), Williams
patent: 3879918 (1975-04-01), Lerner
patent: 3889449 (1975-06-01), Membrino
patent: 4172349 (1979-10-01), Lipes
patent: 4567715 (1986-02-01), Sawa et al.
patent: 5442898 (1995-08-01), Gabree et al.
patent: 5743071 (1998-04-01), Wolthuizen
patent: 5802817 (1998-09-01), Hood
Daisey Machinery Co., Ltd.
Huynh Louis
Sipos John
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