JP2001341753A - Packaging bag for sandwich - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the constant peeling direction of a packaging bag for sandwiches. SOLUTION: In a truncated triangular bag body formed of a synthetic resin oriented film with the direction of orientation set in the wider side direction from a tapered end side, two heat-bonded portions 4 for reinforcement which are heat-bonded from an opening edge to a bonded portion 3 for sealing along the direction of orientation are formed outside an unsealing starting piece 7 in the direction orthogonal to the direction of orientation at a tapered end side of the heat-bonded portion 3 for sealing, and the unsealing direction of the unsealing starting piece is regulated so that even a small bag can be reliably unsealed in the direction of orientation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the opening of sandwich packaging bags.

[0002]

2. Description of the Related Art From the viewpoint of food hygiene, it is important for a sandwich packaging bag to have a sealing property for preventing dust and insects from entering and an easy opening property for easy opening.

Conventionally, this type of packaging bag has been disclosed in
As described in JP-A-32587, two mounting triangular sheets made of a stretched synthetic resin film whose stretching direction is set from the tapered end side to the wide side are overlapped, and both side edges thereof are To form a bag body, heat-welding the tapered end of the bag to seal the opening, and further projecting both films by an appropriate length from the sealing portion, so that the projecting portion of which the superposed surface is not welded And one of the protruding pieces is further protruded to form a free protruding piece, and two parallel cutting lines from the tip toward the sealing section are formed at the center of the free protruding piece in the width direction. The opening start piece which is formed and opened is easily opened by the opened opening start piece.

[0004]

However, in the above-mentioned conventional packaging bag, since the protruding piece itself has no rigidity,
Even if you open with the opening start piece, it will not be torn reliably in the stretching direction of the stretched film, it will become thin in the middle,
Sometimes it did not tear to the end.

Therefore, in order to reliably open the package in the stretching direction, a reinforcing welding portion which is heat-welded in parallel with the sealing heat-welding portion is further provided on the distal end side of the sealing heat-welding portion. There has been proposed a packaging bag in which a so-called waist is provided to the portion and the opening start piece so that the tearing direction can be regulated and the packaging bag can be opened along the stretching direction. Since these are formed at an interval, the leading end side becomes long, and in the case of a small packaging bag, there is a problem that two welded portions cannot be provided as described above.

[0006]

Means for Solving the Problems The present inventor paid attention to the above-mentioned problems, and as a result of earnestly studying a sandwich packaging bag which can easily be opened even with a small bag and obtains a good sealing property, On the tapered end side from the welded portion, two reinforcing heat-welded portions that are heat-welded from the opening edge to the sealing welded portion along the stretching direction outside the opening start piece in a direction perpendicular to the stretching direction along the stretching direction. If formed, the opening direction of the opening start piece is regulated, and it has been found that even a small bag can be reliably opened in the stretching direction, and the present invention has been completed.

That is, the sandwich packaging bag according to the present invention is a triangular bag made of a stretched synthetic resin film whose stretching direction is set from the tapered end to the wide side.
A heat-welded portion for sealing the opening on the tapered end side by heat-welding the wider side than the opening edge on the tapered end side is formed, and between the opening edge and the sealing heat-welded portion, Only in the front side film forming the bag body, two cuts parallel to the stretching direction are formed from the opening edge to the vicinity of the sealing heat welding portion, and the film portion between both cuts is used as an opening start piece. ,
Two reinforcing heat-welded portions are formed by heat-welding from the opening edge to the sealing-welded portion in the direction perpendicular to the stretching direction and outside the cut along the stretching direction. .

When a reinforcing piece having substantially the same width as the opening start piece is joined to the opening start piece, the opening start piece itself has rigidity, so that tearing in the stretching direction can be reliably performed. further,
An opening guide band for opening along the stretching direction is joined to the back surface of the front side film of the bag, and the opening guide band is extended from the wider side than the sealing heat-welded portion of the bag to the back surface of the opening start piece. If the extension is made to function as a reinforcing piece on the back surface of the opening start piece, the opening start piece itself can have rigidity and can be reliably torn open in the extending direction along the guide band.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a packaging bag for sandwiches, and FIG. 2 is a perspective view showing the same usage state.

[0010] As shown, the sandwich packaging bag is
Two superposed synthetic resin (for example, polypropylene) stretched films in which the stretching direction is set in the width direction are overlapped and blown obliquely in the width direction, so that the front film and the back film are connected, and the stretching direction is tapered. A mounted triangular-shaped bag 1 is formed from the end to the wide side.

The bag 1 has an opening edge 2 on the tapered end side.
A heat-welded portion 3 for sealing the opening on the tapered end side by heat-welding the wider side is formed, and the bag body 1 is formed between the opening edge and the heat-sealed portion 3 for sealing. Only in the front side film, two cuts 6 parallel to the stretching direction are formed from the opening edge 2 to the vicinity of the sealing heat welding portion 3, and the film portion between the two cuts 6 serves as an opening start piece 7.

[0012] Then, in the direction perpendicular to the stretching direction, approaching to the outside of the cut 6, heat welding is performed along the stretching direction from the opening edge 2 to the sealing welding portion 3 to form two reinforcing heat welding portions 4. Is formed.

Further, a narrow tape 8 made of polypropylene as an opening guide band for opening along the stretching direction is bonded to the back surface of the front side film of the bag body 1 by a hot melt adhesive. The opening guide band 8 is a bag 1
Is extended from the wider side than the sealing heat-welded portion 3 to the back surface of the opening start piece 7 and functions as a reinforcing piece on the back surface of the opening start piece 7.

In order to package the sandwich in the packaging bag having the above structure, the wide opening of the bag is opened widely.
A triangular sandwich is inserted through the opening, and the wide portion of the opening is folded along the back of the sandwich and stopped with an adhesive tape or the like.

Next, in order to open the packaging bag, the user holds the opening start piece 7 at the tapered end and pulls it toward the inside of the bag body 1. Then, the front film together with the opening start piece 7 is torn along the stretching direction and opened. In this case, the tip side of the sealing heat welding portion 3 is hardened by the two reinforcing heat welding portions 4 and the rigidity thereof is increased.
When the opening start piece 7 is peeled off by holding, the reinforcing heat-welded portion 4 has a function of guiding the tearing direction of the opening start piece 7 on both sides, and the tearing direction is regulated by the stretching direction.

Further, since the tape 8 as an opening guide band is extended to the back surface of the opening start piece 7, the thickness of the opening start piece 7 is increased, the rigidity is increased, and it is easy to grasp and tear. Furthermore, since the opening guide band 8 adhered along the stretching direction exists up to the inside of the bag body 1, it can be opened along the stretching direction at the time of peeling.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made within the scope of the present invention. For example, in the above embodiment, the opening guide band is extended to the back side of the opening start piece and functions as a reinforcing piece, but separately from this, the reinforcing piece is adhered from the front side alone or together with the opening guide band. Configurations can also be employed. Further, the shape of the opening start piece is not limited to a strip shape in which the both end cuts 6 are linear,
A shape in which the tip portion is cut into an arc shape or the like can be adopted.

[0018]

As is apparent from the above description, according to the present invention, two reinforcing heat-welding portions are formed on both sides of the opening start piece at the opening edge, so that the front end side is closer to the tip than the sealing heat-welding portion. This increases the rigidity of the film and restricts the peeling direction, so that even a small bag can be reliably opened in the stretching direction. Also,
If a reinforcing piece is attached to the opening start piece, there is an advantage that its rigidity is increased, and it is easy to grasp and peel off.

[Brief description of the drawings]

FIG. 1 is a plan view of a sandwich packaging bag showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the same use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag body 2 Opening edge 3 Heat welding part for sealing 4 Heat welding part for reinforcement 6 Break 7 Opening start piece 8 Opening guide band

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 85/36 B65D 85/36 A F term (Reference) 3E064 AD16 BA30 BB04 BC18 EA12 FA01 GA04 HM01 HN04 HP03 HP04 3E067 AA11 AB01 BA12A BA31A BB14A BB16A BB18A CA24 EA06 EB07 EB10 EB11 EC25 EE38 EE59 3E096 AA01 BA28 BB07 CA12 CB10 DA10 DB04 DC01 EA02X EA02Y FA27 GA01

Claims (3)

[Claims] 1. A heat-welding process is performed on a bag-shaped triangular bag made of a stretched synthetic resin film in which the stretching direction is set from the tapered end side to the wide-width direction. A heat-welded portion for sealing the opening on the tapered end side is formed, and between the opening edge and the heat-sealed portion for sealing, only the front side film forming the bag body is parallel to the stretching direction. The two cuts are formed from the opening edge to the vicinity of the sealing heat-sealing portion, and the film portion between both cuts is used as an opening start piece, and is stretched to the outside of the cut in a direction orthogonal to the stretching direction. A sandwich packaging bag in which two reinforcing heat-welded portions are formed by heat-welding along the direction from the opening edge to the sealing-welded portion. 2. The sandwich packaging bag according to claim 1, wherein a reinforcing piece having substantially the same width as the opening start piece is joined to the opening start piece. 3. An opening guide band for opening along the stretching direction is joined to the back surface of the front side film of the bag body, and the opening guide band is wider than the sealing heat-welded portion of the bag body. 2. The sandwich packaging bag according to claim 1, which extends from the opening to the back surface of the opening start piece, and functions as a reinforcing piece at the back side of the opening start piece.