JP2588801B2 - Packaging bag with locking holes - Google Patents

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 in which a locking hole is formed in a heat sealing zone in the width direction of the upper portion of a bag body.

[0002]

2. Description of the Related Art FIG. 6 shows a packaging bag in which a locking hole is formed in a widthwise heat fusion zone (that is, a header portion) at an upper portion of a bag body.
In general, a packaging bag as shown in a perspective view (a perspective view when viewed from the rear side) is used.

[0003] In this packaging bag, the both ear ends of the sheet are heat-sealed on the back of the bag body (1) after bag-making by a palm-spreading method to form a fin-shaped rear heat-sealing band (3) of fish fins. ), And the upper longitudinal heat fusion zone (4) is formed on the upper part of the bag body (1) with the rear vertical heat fusion zone (3) pushed down on either side. A locking hole (5) is formed in the center of the upper widthwise heat fusion zone (4).

Although it does not relate to a packaging bag with a locking hole, Japanese Utility Model Laid-Open Publication No. Sho 62-22939 discloses that both sides of an opaque laminate film band are bent inward by a required width to form a gap with both side pieces. In order to close the gap, both sides of the transparent double-sided heat-sealable laminate film strip are brought into contact with the lower sides of the both side pieces and integrally heat-sealed to cut the bag into an appropriate size. A bag with a viewing window is shown. (See Fig. 2 of this publication)

[0005]

The conventional packaging bag with a locking hole shown in FIG. 6 has an aesthetic appearance because the rear longitudinal heat sealing band (3) projects in the shape of a fish fin on the back of the bag body. Not only is impaired, but also has serious defects as described below.

That is, an upper widthwise heat fusion zone of the bag.
The locking hole (5) provided in the center of (4) is composed of the two-sheet structure of the front and back sheets of the bag body (1) and the rear vertical heat fusion zone (3) ) And the front and back sheets of the bag body (1) are perforated at the boundary between the four-piece structure, so that when the product is stored in the packaging bag and hung, the locking holes (5) In addition to the unbalanced force applied to the locking hole (5), the strength of the locking hole (5) depends on the strength of the sheet constituting the bag body (1), so that the locking hole (5) tends to tear or break. .

[0007] If the locking hole (5) is broken, the value of the product is significantly reduced even though the stored product has no abnormality. Therefore, prevention of breakage of the locking hole (5) is strongly desired by those concerned.

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

Under such a background, the present invention does not have a fish-fin-shaped vertical heat-sealing band (3), and also tears or breaks the hanging hole (5) for suspension. It is an object of the present invention to provide a packaging bag with a locking hole.

[0010]

According to the packaging bag of the present invention, both ear ends of the sheet are abutted or overlapped along the longitudinal center line on the back surface of the bag body (1) after the bag is made. At the same time, a heat-fusible tape (2) is arranged on the inner surface side of the butted portion or the overlapped portion and heat-fused to form a back longitudinal heat-fused zone (3), and the bag body ( An upper widthwise heat fusion zone (4) is formed at the top of (1), and these upper widthwise heat fusion zone (4) and back longitudinal heat fusion zone (3) are formed.
An overlapping portion is provided with a locking hole (5).

Hereinafter, the present invention will be described in detail.

Examples of sheets forming the bag body (1) include various types of single-layer or multiple-layer plastic films, plastic films provided with an air-permeable layer, plastic-metal foil laminates, plastic-paper. A sheet made of a laminate or the like and having at least an inner surface having heat-sealing properties is used. Considering cost, strength, heat sealability, transparency, slipperiness, versatility, etc., biaxially oriented polypropylene (OPP) and unoriented polypropylene (CP
P) and the laminated film are important,
A laminated film of PP and CPP (particularly when forming a gusset bag) is also important.

In the present invention, both ends of the sheet are abutted or overlapped along the longitudinal center line on the back surface of the bag body (1) after the bag is made. Then, a heat-fusible tape (2) is arranged on the inner surface side of the abutting portion or the overlapping portion and heat-fused to form a rear longitudinal heat-fusing zone (3). In the case of abutting, even if the both ends of the sheet slightly overlap or a slight gap is formed in the abutting portion, it does not cause any particular problem as long as it is within an allowable range. In the case of overlapping, it is desirable that the width of the overlapping portion be wider than the diameter of the locking hole (5).

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

The width of the heat-fusible tape (2) is arbitrary as long as it is at least about 1.5 times the diameter of the locking hole (5). However, if the width is larger than necessary, it is disadvantageous in cost. , 15-3
It is often about 0 mm.

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

A gusset bag may be formed by folding both side edges of the bag body (1) inward. In this case, the inward folding is performed before the upper widthwise heat fusion zone (4) is formed.

The above-mentioned overlapping portion of the upper widthwise heat sealing zone (4) and the back longitudinal heat sealing zone (3) is formed by the sheet on the front and back of the bag body (1) and the heat-sealing tape (3). 2) Three-piece structure (for butt) or four-piece structure (for overlapping)
Therefore, a locking hole (5) is formed in the center of the overlapping portion (the center may be closer to the center or lower than 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 fusing, bonding, or sticking of an adhesive tape. The enclosing of the product can also be performed during the manufacturing process of the packaging bag.

[0020]

According to the packaging bag of the present invention, both ends of the sheet are abutted or overlapped along the longitudinal center line on the back surface of the bag body (1) after the bag is made. However, since the heat-sealing tape (2) is arranged and heat-sealed on the inner surface side of the butted portion or the overlapped portion, the shape of the bag does not become a fish fin like a conventional product, and the appearance of the bag is extremely high. It will be cleaner.

The locking hole (5) is located at the upper widthwise heat sealing zone.
Since it is perforated at the overlapping part of (4) and the back vertical heat fusion zone (3), it does not cause imbalance as in the conventional product, and also has the necessary strength for the heat fusion tape (2). Since it is possible to freely select what to have, even if a strong force is applied to the locking hole (5), troubles such as tearing and breakage hardly occur.

As described above, the heat-fusible tape (2) eliminates the fin-like fusion portion of the fish, eliminates the imbalance in the laminated structure of the holes where the locking holes (5) are formed, and fixes the locking holes (5). It plays three important roles: preventing tearing or breakage of 5).

[0023]

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

Example 1 FIG. 1 is a perspective view of a packaging bag having 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 bag body of 7 mm and formed of a 50 μm thick film having a layer structure of CPP / heat-sealable OPP.

(2) is a heat-fusible tape having a width of 20 mm,
70 μm thick having a layer structure of CPP / OPP / CPP
It is formed of tape.

The above-mentioned film is folded so that the CPP layer becomes the inner layer, and the both ears of the film are abutted along the longitudinal center line on the back surface of the bag body (1) after the bag is made. is there. Both side edges of the bag body (1) are folded inside by 30 mm each 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 a state of being arranged, thereby forming a rear vertical heat-fusing zone (3).

(4) is an upper widthwise heat fusion zone formed on the upper portion of the bag body (1), and the width between the upper side and the lower side is set to 20 mm. The upper widthwise heat-fusion zone (4) is heat-sealed including both folds in both side areas, so that it has a four-piece structure, and the center area has a heat-sealing tape (2).
In this state, the front and back films are heat-sealed in a state of three sheets. Between these two side areas and the central area,
The front and back films are heat-fused into two sheets (FIG. 2 (FIG. 5 described later) is exaggerated in film thickness, so it looks like they are separated from each other. The film is fused).

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

The merchandise is inserted through an open portion at the bottom of the bag body (1), and is sealed by heat sealing or by sticking a cellophane adhesive tape.

The locking hole of the packaging bag having the above configuration
(5) was hooked on a hook made of a round bar having a diameter of 7 mm with its tip bent upward, and a tensile tester was used to apply a downward tensile force to measure the load up to breakage. 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 fusion zone (4) of the gas-lined 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 twelve.

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

Reference numeral (6) denotes a raw sheet supply unit, which includes a raw roll (61) wound with the raw sheet (S) and an adjusting roller (62) for connecting the drawn raw sheet (S) downstream. ). Although a large number of adjusting rollers (62) are actually used,
In the figure, only two are shown.

Reference numeral (7) denotes a tape supply unit, which is a tape roll (71) around which the heat-fusible tape (2) is wound, and an adjusting roller (72) for connecting the drawn-out heat-fusible tape (2) downstream. ), And a tape support arm (73) that determines the position of the supplied heat-fusible tape (2) and serves as a lower support for a center seal described later.

(8) a sheet folding mechanism for folding the original sheet (S) supplied from the original sheet supply section (6) into a predetermined shape and folding it into a gusset;
First guide wheel for folding back both ears of raw sheet (S)
(81), a second guide wheel (82), and a third guide wheel (83) for folding into a 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
(S) is introduced via the tape supporting arm (73) from the unfolded collar portion that has not yet been folded, and is positioned on the inner surface of the butted portion of the two ends of the raw sheet (S). At the downstream side of the guide wheel (82), the butted portion of the raw sheet (S) is in a two-layer state in which the heat-fusible tape (2) is superposed on the inside.

(9) is a heat fusion cutting mechanism, in which the base end is fixed to the tape support arm (73) and the tongue (91) having the free end at the distal end, a center seal, that is, a rear longitudinal heat fusion mechanism. band
(3) Forming heat seal bar (92), cooling bar (93) provided on the downstream side, upper width direction heat fusion zone (4) Header sealer (94) for forming, raw sheet (S) And a cutter (96) for obtaining a bag body (1) by cutting at a predetermined length.

In manufacturing the packaging bag, first, the material roll (61) and the tape roll (71) are set in the material sheet supply part (6) and the tape supply part (7), respectively.
Then, the raw 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 is initially set in the sheet folding mechanism (8) and the heat-fusing cutting mechanism (9), respectively.

Thereafter, when the drive roller (95) is driven to pull out the raw sheet (S) and the heat-fusible tape (2), the raw sheet (S) is brought into contact with the first guide wheel (81) and the second guide wheel (81). It is folded by the guide wheel (82). 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).

Thereafter, a heat sealing bar (92) forms a rear vertical heat fusion zone (3), is cooled by a cooling bar (93), and a gusset is formed by a third guide wheel (83).
The header sealer (94) forms the upper widthwise heat fusion zone (4), and at the same time the locking hole (5) is formed. Finally, the cutter (96) forms the unit bag.

Although the production of an empty bag in which no product is enclosed has been described above, the product (O) can be wrapped while making the bag.

In this case, for example, a chain conveyor (C) for transferring goods (O) is provided above the material roll (61), and the goods (O) are successively separated at predetermined intervals by the sheet folding mechanism (8). Feed it into the open collar of the anti-seat (S). Then, the product (O) proceeds with the product (O) thereafter placed on the raw sheet (S), and a 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 another method without drawing out the raw sheet (S) by the drive roller (95).

Example 2 FIG. 5 is a cut end view showing another example of a packaging bag having a locking hole according to the present invention, and is cut in the width direction of the bag at the upper widthwise heat fusion zone (4). FIG.

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

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

The other configuration is the same as that of the first embodiment, and the description is omitted. The locking hole (5) of the obtained packaging bag has a tear strength higher than that of Example 1.

[0049]

According to the packaging bag of the present invention having a locking hole, there is no heat-melting zone projecting out of the bag like a fish fin unlike the conventional product, so that the appearance is clear and beautiful. It becomes more preferable. In addition, the imbalance in the laminated structure of the holes formed in the locking holes (5) has been eliminated, and the strength has been improved by the heat-fusible tape (2). ) Is prevented from tearing and breaking.

[Brief description of the 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 the line AA of FIG. 1;

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

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

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

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

[Explanation of symbols]

(1) ... bag body, (2) ... heat-fusible tape, (3) ... rear vertical heat-seal zone, (4) ... upper width direction heat-seal zone, (5) ... locking hole, ( 6) ... sheet feeder, (61) ... roll, (62) ... adjustment roller, (7) ... tape supply section, (71) ... tape roll, (72) ... adjustment roller, (73) ... (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)… raw sheet, (C)… chain conveyor, (O)… product

Claims (1)

(57) [Claims] 1. Both ends of a sheet are abutted or overlapped along a longitudinal center line on the back of a bag body (1) after bag making, and heat is applied to an inner surface of the abutted portion or the overlapped portion. By arranging the heat-fusible tape (2) and heat-sealing, the back longitudinal heat-sealing zone (3) is formed, and the bag body (1)
The upper widthwise heat fusion zone (4) is formed at the upper part of the upper part, and the upper widthwise heat fusion zone (4) and the back longitudinal heat fusion zone are formed.
(3) A packaging bag with a locking hole having a configuration in which a locking hole (5) is formed in an overlapping portion with (3).