JPH0516948A - Packaging bag with engaging hole - Google Patents

Abstract

PURPOSE:To provide a packaging bag with engaging hole which does not have a fin shaped heat-welded band in the longitudinal direction on the back surface, and for which tear or damage at the engaging hole for suspension is hard to be generated. CONSTITUTION:Both edge ends of a raw material sheet are butted or put together along the central line in the longitudinal direction on the bag surface of a bag main body 1 after bag making, and at the same time, a heat-weldable tape 2 is arranged on the inner surface side at the butted or put together part, and heat-welding is performed to form a heat-welded band 3 in the longitudinal direction on the back surface. A heat-weled band 4 in the width direction at the top part is formed at the top part of the bag main body 1. In addition, an engaging hole 5 is provided at the overlapped part between the heat-welded band 4 in the width direction at the top part and the heat-welded band 3 in the longitudinal direction on the back surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag having a locking hole, which has a locking hole formed in a widthwise heat-sealing zone on an upper portion of a bag body.

[0002]

2. Description of the Related Art As a packaging bag in which a locking hole is formed in a widthwise heat-sealing zone (that is, a header portion) on an upper portion of a bag body, as shown in FIG.
A packaging bag having a perspective view (a perspective view when viewed from the back side) is generally used.

In this packaging bag, both ends of the sheet are heat-sealed on the back surface of the bag body (1) after bag-making by a joint-sealing method to form a fin-shaped heat-sealing belt (3) in the longitudinal direction of a fish fin. ), And while pushing the rear longitudinal heat-sealing zone (3) to the left or right side, form the upper width-direction heat-sealing zone (4) on the upper part of the bag body (1). A locking hole (5) is formed at the center of the upper widthwise heat-sealing zone (4).

Although it is not related to a packaging bag with locking holes, in Japanese Utility Model Laid-Open No. 62-22939, both sides of an opaque laminated film strip are bent inward by a required width to form a gap with both side pieces. , So as to seal the gap, both sides of the transparent double-sided heat-sealable laminated film strip are brought into contact with the lower sides of the both side pieces and heat-bonded integrally, and cut into an appropriate size of the bag. A bag having a viewing window is shown. (See FIG. 2 of this publication)

[0005]

The conventional packaging bag with locking holes shown in FIG. 6 has a beautiful appearance because the rear longitudinal heat-sealing zone (3) projects like a fin of a fish on the back surface of the bag body. Not only is damaged, but also has the following serious defects.

That is, the upper widthwise heat-sealing zone of this bag
The locking hole (5) provided in the center of (4) includes: -the two-sheet structure of the front and back sheets of the bag body (1);-the back longitudinal heat-sealing zone (3) that is pushed down. ) And the front and back sheets of the bag body (1) are formed at the boundary between the four-sheet structure, so that the locking hole (5) when the product is accommodated in this packaging bag and suspended. The unbalanced force is applied to the lock hole (5), and the strength of the locking hole (5) depends on the strength of the sheet forming the bag body (1), so that the locking hole (5) is likely to be torn or damaged. ..

If the locking hole (5) is damaged, the merchandise value is remarkably reduced although the contained merchandise is normal. Therefore, prevention of breakage of the locking hole (5) is strongly desired by the persons concerned.

The bag having a viewing window disclosed in Japanese Utility Model Laid-Open No. 62-22939 does not have a back longitudinal heat-sealing zone (3), and does not relate to a packaging bag with a locking hole. Therefore, it has no particular relation to the present invention.

Under such a background, the present invention does not have a fish fin-shaped rear longitudinal heat-sealing zone (3), and furthermore, the hanging hole (5) for hanging is torn or broken. The object is to provide a packaging bag with a hard locking hole.

[0010]

In the packaging bag with locking holes according to the present invention, both edges of the sheet are abutted or overlapped with each other along the longitudinal center line of the back surface of the bag body (1) after bag making. At the same time, the heat-fusible tape (2) is placed on the inner surface side of the butted portion or the overlapped portion and heat-fused to form the back-side longitudinal heat-fusing zone (3). An upper widthwise heat-sealing zone (4) is formed on the upper part of (1), and these upper widthwise heat-sealing zone (4) and back longitudinal heat-sealing zone (3) are further formed.
A locking hole (5) is formed in an overlapping portion with and.

The present invention will be described in detail below.

As the sheet forming the bag body (1), various kinds of single-layer or multi-layer plastics films, plastics films provided with an air-permeable layer, plastics-metal foil laminate, plastics-paper A sheet made of a laminate or the like and having at least an inner surface side having a heat fusion property is used. Considering cost, strength, heat-sealing property, transparency, slip property, and versatility, biaxially oriented polypropylene (OPP) and unoriented polypropylene (CP)
The laminated film with P) is important, and the heat sealability is O
A laminated film of PP and CPP (particularly when used as a gusset bag) is also important.

In the present invention, the both ends of the sheet are abutted or overlapped with each other along the longitudinal center line on the back surface of the bag body (1) after bag making. Then, the heat-fusible tape (2) is arranged on the inner surface side of the butted portion or the overlapped portion and heat-bonded to form the back surface longitudinal heat-bonding zone (3). In the case of butting, even if a little overlap or a slight gap is generated at both ends of the sheet at the butting portion, it does not cause any trouble as long as it is within the allowable range. Further, in the case of superposition, it is desirable that the width of the superposition part be larger than the diameter of the locking hole (5).

As the heat-fusible tape (2), the bag body (1)
A sheet having a strength (particularly a tear strength) equal to or higher than that of the sheet used for forming the is used. Preferred examples include tapes made of CPP monolayer film, CPP / O.
For example, a tape made of a laminated film having a layer structure of PP / CPP.

The width of the heat-fusible tape (2) is arbitrary as long as it is about 1.5 times the diameter of the locking hole (5) or more, but it is costly to make it wider than necessary. 15-3
It is often about 0 mm.

An upper widthwise heat-sealing zone is provided on the upper portion of the bag body (1).
(4) is formed, and this band becomes the so-called header section. The width between the upper side and the lower side of the upper widthwise heat-sealing zone (4) should be about 1.5 times the diameter of the locking hole (5) or more, especially about 1.8 times or more.

It is also possible to fold both side edges of the bag body (1) inward to form a gusset bag. In this case, the inward folding is performed before forming the upper widthwise heat-sealing zone (4).

The overlapping portion of the upper widthwise heat-sealing zone (4) and the backside longitudinal heat-sealing zone (3) described above is the sheet on the front and back of the bag body (1) and the heat-sealing tape (3). 2) 3-layer structure (in case of butting) or 4-layer structure (in case of overlapping)
Therefore, the locking hole (5) is bored in the center of the overlapped portion (which may be near the center or above the center).

Since the bottom of the bag body (1) is open,
After inserting the product from here, it is sealed by means such as fusion bonding, adhesion, and sticking of an adhesive tape. Product encapsulation can also be performed during the manufacturing process of the packaging bag.

[0020]

In the packaging bag with locking holes according to the present invention, both edges of the sheet are abutted or overlapped with each other along the longitudinal center line on the back surface of the bag body (1) after bag making. Since the heat-sealing tape (2) is placed on the inner surface of the butt portion or the overlapped portion for heat-sealing, it does not have the fin-like shape of the fish like conventional products, and the appearance of the bag is extremely It will be refreshing.

Further, the locking hole (5) is an upper widthwise heat-sealing zone.
(4) and the longitudinal longitudinal heat-sealing zone (3) are overlapped with each other, so imbalance does not occur unlike conventional products, and the heat-sealing tape (2) has the required strength. You can freely select what you have, so even if a strong force is applied to the locking hole (5), problems such as tearing and damage are unlikely to occur.

In this way, the heat-fusible tape (2) eliminates the fin-like fusion part of the fish, eliminates the imbalance in the laminated structure of the hole of the locking hole (5), and locks the hole ( It plays three important roles: to prevent tearing or damage of 5).

[0023]

EXAMPLES The present invention will be further described with reference to examples.

Example 1 FIG. 1 is a perspective view of a packaging bag with a locking hole according to the present invention when viewed from the back side, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. It is a BB line cut end view.

(1) The width after bag making is 100 mm and the height is 24
It is a 7 mm bag body and is formed of a 50 μm thick film having a layered structure of CPP / heat-sealing OPP.

(2) is a heat-fusible tape having a width of 20 mm,
Thickness 70 μm with CPP / OPP / CPP layer structure
Made of tape.

The above-mentioned film was folded so that the CPP layer became the inner layer, and both ears of the film were abutted along the longitudinal center line of the back surface of the bag body (1) after bag making. is there. Both side edges of the bag body (1) are folded inward by 30 mm to form a gusset bag.

On the inner surface side of the abutting portion, the above-mentioned heat-fusible tape (2) is heat-fused in the state of being arranged, and a backside longitudinal heat-bonding zone (3) is formed.

(4) is an upper widthwise heat-sealing zone formed on the upper part of the bag body (1), and the width between the upper side and the lower side thereof is set to 20 mm. The upper widthwise heat-sealing zone (4) is heat-sealed in both areas including both folded portions, and thus has a four-layer structure, and the central area has the heat-sealing tape (2).
It has a three-sheet structure in which the front and back films are heat-sealed with the intervening film. Between these two side areas and the central area,
The front and back films are heat-sealed to form a two-layered structure (in FIG. 2 (also in FIG. 5 described later), the film thickness is exaggerated, so they appear to be separated, but in reality, this part is The film is fused).

Reference numeral (5) is a locking hole having a diameter of 8 mm, which is formed in the center of the overlapping portion of the above-described upper widthwise heat-sealing zone (4) and the rear longitudinal heat-sealing zone (3). is there.

The product is inserted from the open portion at the bottom of the bag body (1) and sealed by heat fusion or application of cellophane adhesive tape.

Locking hole of packaging bag having such a structure
Hook (5) on a hook consisting of a round bar with a diameter of 7 mm with the tip bent upward, and apply a tensile force downward with a tensile tester to measure the load until damage. in the range of ~6kg / cm ^2, those below 5 kg / cm ² was none. By the way, a locking hole is formed in the upper widthwise heat-sealing zone (4) of the gas-sealed bag made of the same film.
When the (5) is provided, in the range the majority of 2-3 kg / cm ² of the 50 samples, those exceeding 3 kg / cm ² only five, below 2 kg / cm ² There were 12 pieces.

FIG. 4 is an explanatory view showing an example of an apparatus for producing a packaging bag with a locking hole according to the present invention. The packaging bags shown in FIGS. 1 to 3 are continuously produced by such an apparatus. be able to.

Reference numeral (6) is an original sheet feeding section, which is an original roller (61) wound with an original sheet (S) and an adjusting roller (62) connecting the drawn original sheet (S) to the downstream side. ) And. Although many adjusting rollers (62) are actually used,
In the figure, only two are shown.

Reference numeral (7) is a tape supply section, which is a tape roll (71) around which the heat-fusible tape (2) is wound, and an adjusting roller (72) which connects the drawn heat-fusible tape (2) downstream. ), And a tape supporting arm (73) that serves as a lower supporting portion for a center seal, which will be described later, while determining the position of the heat-fusible tape (2) to be supplied.

(8) is a sheet folding mechanism, which is a mechanism for folding the original sheet (S) supplied from the original sheet supply section (6) into a predetermined shape and folding it into the gazette.
First guide ring for folding back both edges of the original sheet (S)
(81), a second guide wheel (82), and a third guide wheel (83) for folding into the gusset.

The heat-fusible tape (2) is continuously supplied from the tape supply unit (7) toward the sheet folding mechanism (8). In this case, the heat-fusible tape (2) is Anti sheet
It is introduced from the unfolded open collar of (S) through the tape support arm (73) and is located on the inner surface of the abutting portion of the two edges of the original sheet (S). On the downstream side of the guide wheel (82), the abutting portion of the original sheet (S) is in a two-layer state in which the heat-fusible tape (2) is laminated inside.

(9) is a heat fusion cutting mechanism, which has a tongue portion (91) whose base end side is fixed to the tape support arm (73) and whose front end side is a free end, a center seal, that is, a rear longitudinal heat fusion bond. band
(3) Heat seal bar (92) for forming, cooling bar (93) provided on the downstream side, header sealer (94) for forming upper widthwise thermal fusion zone (4), raw sheet (S) It is composed of a drive roller (95) for advancing the bag and a cutter (96) for cutting the bag body (1) to a predetermined length.

In manufacturing the packaging bag, first, the original fabric roll (61) and the tape roll (71) are set in the original fabric sheet supply unit (6) and the tape supply unit (7), respectively.
Then, the original sheet (S) passes through the adjusting roller (62),
On the other hand, the heat-fusible tape (2) is pulled out via the adjusting roller (72) and initially set in the sheet folding mechanism (8) and the heat-fusion cutting mechanism (9).

After that, the drive roller (95) is driven to pull out the original sheet (S) and the heat-fusible tape (2), and the original sheet (S) moves to the first guide wheel (81) and the second guide wheel (81). It is restricted by the guide wheel (82) and folded. At this time, the heat-fusible tape (2) is supplied to the inside of the butted portion from the gap where the butting has not been completed, and advances together with the raw sheet (S) on the tongue (91).

After that, the heat seal bar (92) forms the rear longitudinal heat-sealing zone (3), the cooling bar (93) cools it, and the third guide wheel (83) forms a gusset.
The header sealer (94) forms the upper widthwise heat-sealing zone (4) and at the same time the locking hole (5) is formed, and finally the cutter (96) forms a unit bag.

Although the manufacture of the empty bag in which the product is not enclosed has been described above, the product (O) can be packaged while the bag is being formed.

In this case, for example, a chain conveyor (C) for transferring the goods (O) is provided above the material roll (61), and the goods (O) are sequentially arranged at a predetermined interval and immediately before the sheet folding mechanism (8). Send it to the open collar of the anti-seat (S). Then, the product (O) proceeds while being placed on the original sheet (S), and the packaging bag containing the product (O) is obtained.

In this case, however, it is necessary to pay attention to the movement of the header sealer (94) and to devise the original sheet (S) by another method without using the drive roller (95).

Example 2 FIG. 5 is a cut end view showing another example of the packaging bag with locking holes according to the present invention, which is cut in the width direction of the bag at the upper widthwise heat-sealing zone (4). The case is shown.

(1) is a bag body, which is formed of a film having a layered structure of CPP / heat-sealing OPP.

The above-mentioned film was folded so that the CPP layer became the inner layer, and both ears of the film were overlapped by a width of 20 mm along the longitudinal center line of the back surface of the bag body (1) after bag making. It is heat fused. Both side edges of the bag body (1) are folded inward by 30 mm to form a gusset bag.

Since the other structure is the same as that of the first embodiment, the description thereof will be omitted. The locking hole (5) of the resulting packaging bag has a tear strength higher than that of Example 1.

[0049]

EFFECTS OF THE INVENTION In the packaging bag with locking holes of the present invention, unlike the conventional product, there is no heat-sealing zone protruding outside the bag like a fin of a fish, so that the appearance is neat and aesthetic. It will be preferable. In addition, since the imbalance in the laminated structure of the hole of the locking hole (5) is eliminated and the strength is improved by the heat-sealing tape (2), the locking hole (5 ) Is prevented from being torn or damaged.

[Brief description of drawings]

FIG. 1 is a perspective view of a packaging bag with a locking hole according to the present invention when viewed from the back side.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional end view taken along line BB of FIG.

FIG. 4 is an explanatory view showing an example of an apparatus for manufacturing a packaging bag with locking holes according to the present invention.

FIG. 5 is a cut end view showing another example of the packaging bag with locking holes according to the present invention, showing the case of cutting in the width direction of the bag at the upper widthwise heat-sealing zone (4). is there.

FIG. 6 is a perspective view of a conventional packaging bag with locking holes when viewed from the back side.

[Explanation of symbols]

(1)… Bag body, (2)… Heat-bonding tape, (3)… Back longitudinal heat-bonding zone, (4)… Top width-direction heat-bonding zone, (5)… Locking hole, ( 6) ... original sheet feeding unit, (61) ... original roll, (62) ... adjusting roller, (7) ... tape feeding unit, (71) ... tape roll, (72) ... adjusting roller, (73) ... Tape support arm, (8) ... sheet folding mechanism, (81) ... first guide wheel, (82) ... second guide wheel, (83) ... third guide wheel, (9) ... heat fusion cutting mechanism, ( 91) ... tongue, (92) ... heat seal bar, (93) ... cooling bar, (94) ... header sealer, (95) ... drive roller, (96) ...
Cutter, (S) ... original sheet, (C) ... chain conveyor, (O) ... product

Claims (1)

Claims: 1. Both edges of the sheet are butted or superposed along the longitudinal center line of the back surface of the bag body (1) after bag making, and the butted portion or superposition thereof. The heat-sealable tape (2) is placed on the inner surface of the part and heat-sealed to form the longitudinal heat-seal zone (3) on the back side, and the bag body (1)
An upper widthwise heat-sealing zone (4) is formed on the upper part of each of the upper widthwise heat-sealing zone (4) and the rear longitudinal heat-sealing zone (4).
A packaging bag with a locking hole having a structure in which a locking hole (5) is formed in an overlapping portion with (3).