JPH0776354A - Easily unsealable tape-sealed bag - Google Patents

Abstract

PURPOSE:To make unsealing posible for a bag with a small force without allowing the bag to be torn by a method wherein an unsealing part is formed with edge lines on both ends of a bag-forming film placed adjacently, and a release tape is welded for sealing along two welding lines over the unsealing part. CONSTITUTION:A seal-up bag 1 is made of a film that is made up with its both sides formed of heat sealing layers 10. An unsealing part 2 is formed with edge lines 3 on both ends of a bag-forming film placed adjacently, pr contacting or overlapping each other. A release tape 4 is welded for sealing, extending over the edge lines 3 on both ends. Heat sealing layers 11 are formed to both sides of the release tape 4 while a separate layer 12 is formed to the inside thereof. Two welding lines are provided to the outside of each of the edge lines 3 on both ends of the bag-forming film. Welding is applied to welding parts 6 on both the upper and the lower ends of the seal-up bag 1 with unwelded parts 7 left unwelded on both the upper and the lower ends. Therefore, the release tape 4 is made to be unstuck on the welded parts 7, allowing tabs 8 to be formed for being caught by fingers. By nipping and pulling the tabs 8 with the fingers, the relase tape 4 can be splitted in the separate layer 12, and unsealing can be made with the two edge lines 3 closed with the release tape 4 opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-open tape-sealing bag which makes it easier to manufacture a tape-sealing bag which uses a peeling tape for fusing the unsealed portion and which can be easily opened.

[0002]

2. Description of the Related Art Heretofore, a sealed plastic film bag has been used which has one or two vertical fusion-bonded portions, and then both ends are horizontally fused. A sealed bag called a three-way seal, which is easy to manufacture and has one vertical fusion-bonded portion, is often used. Among the three-sided seals, the one with the vertical fusion-bonding part provided in the center of the bag is called a pillow-type bag, and the vertical fusion-bonding method is as follows: In addition, the sticking of envelopes and the like, which overlap the other edge, were often used. Further, a so-called stand pack in which a gusset is put in the bottom of the film to be fused and filled with the contents to impart erection and an opening portion is provided at the top is also used. In addition, long contents, which are almost the same as the length of the sealed bag,
Depending on the contents, the opening part of the sealed bag may be required to be located at one end instead of the central part.

The tape-attached bag is a vertical fusion-bonding portion, and the edges of both ends of the film are brought into contact with each other, and a tape having a heat-fusible layer on both sides is heat-fused from the back surface. It is a horizontally fused bag. In the tape-sealed bag, the stress of breaking the bag is not the force that directly peels off the fusion-bonded part like the joint-sealed bag, but the displacement stress between the tape and the film. It has the advantage of not being afraid.

[0004]

However, although there is a preferable bag that does not leak liquid as the tape-attached bag, it is difficult to open because the tape is on the back surface. Therefore, there has been a demand for a simple sealed bag that can be opened by hand from the outside even though it is a tape-sealed bag.

[0005]

An object of the present invention is to solve the above-mentioned problems, and the constitution thereof is a sealed bag made of a film having a heat-fusible layer on both sides, wherein one side of the sealed bag is At least two peeling tapes whose end edges are close to, contact with or overlap with each other to form an unsealed part, and which covers the unsealed part and whose adhesive surface to the bag film is a heat-fusible layer And the two innermost tape fusion lines are present outside the edge lines of the two films, respectively, or the both ends of the film overlap each other. To form an unsealed part, and the two films of the unsealed part are heat-sealed by interposing a release tape having a heat-fusible layer on both sides and for a bag outside the tape-sealed part Part of either or both of the film and release tape are fused Characterized in that it remains without.

The material of the sealed bag in the present invention is made of various plastic films such as polypropylene, polyester, polyethylene, nylon and the like, or a laminate of these films or a base film made of a laminate of these and other materials, and has a low melting point. Is provided with a heat-fusible layer of low density polyethylene, ethylene-vinyl acetate copolymer, polypropylene or the like. Alternatively, if the base material is a film which is itself heat-fusible, such as a polyethylene film or a polypropylene film, the heat-fusible layer is not particularly provided, and a single layer film may be used.

Further, even if the outer layer is a film composed of a material layer which is not generally considered to be heat-fusible, the release tape is a material having a heat-fusible surface for a specific film. Can be used for For example, polyester can be fused by using a tape provided with a base film layer on a specific easy open lid material film (KS-640c manufactured by Shinto Cello Corporation).

In the present invention, the unsealed portion is a portion where the edge lines of the bag film are close to, in contact with, or overlapped with each other. By fusing the peeling tape to the unsealed portion, the sealed bag of the present invention having a large fusing strength and easy to unseal is obtained.

The form of the bag is not particularly limited, and even in the so-called pillow type in which one vertical fusion line is provided at the center of one side of the bag, the vertical fusion line is provided at the end of one side of the bag. Even if it is biased, it does not matter if it does not match the crease line. Also,
Gusset type bags with gusset folds at both ends can also be used. In this case, a large amount of contents can be filled, which is preferable. Further, the unsealing portion of the present invention can be provided on one surface of the gusset bag, which has a gusset on the bottom and is provided with uprightness, opposite to the gusset. Furthermore, even if it is a four-sided sealed bag,
It is also possible to provide the unsealing portion of the present invention close to the end of one surface. This case is particularly preferable when the content is long.

The peeling tape of the present invention has at least a three-layer structure in which at least one surface is a heat-fusible layer or a pressure-sensitive adhesive layer, and the inner layer is a peeling layer. For example, a laminated structure composed of stretched polypropylene layer / corona-treated polyethylene layer / release layer / polypropylene layer, polyethylene layer / corona-treated polyethylene layer / release layer / polystyrene layer, polypropylene layer / corona-treated polyethylene layer / release layer / polypropylene layer, etc. Tape is used.

[0011]

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

Embodiment 1 FIG. 1 is a plan view of a surface of an airtight bag of the present invention provided with an opening, FIG.
2 is an end view taken along line II-II in FIG. 1, and FIG. 3 is a perspective view showing a state in which the package is opened.

Reference numeral 1 is a hermetically sealed bag, which is a double-sided heat-fusible film produced by a three-layer coextrusion method of polypropylene / linear low-density polyethylene / polypropylene.
Reference numeral 2 is an opening portion, and 3 is an edge line of the bag film.
Ideally, the edge line of the bag film is brought into contact with the opening section 2. However, since it is expected that some deviation will occur in the actual work, it does not matter even if they are slightly overlapped or slightly opened. FIG. 1 shows a state in which they are slightly overlapped, and FIG. 2 shows a state in which they are slightly open. The peeling tape 4 was fusion-bonded so as to cover the portions of the edge lines 3 at both ends. As the release tape 4, a DI made of corona-treated polyethylene / release layer / polypropylene
FAREN (Dainippon Ink and Chemicals, Inc., PP-1
A release tape having a stretched polypropylene layer on the corona-treated surface of (00) was used.

The fusing method is the edge line 3 of the two bag films.
Two tape fusion bonding lines 5 were provided on the outer side of the. The width of the tape fusing line 5 can be appropriately determined according to the fusing strength required for the bag. In this embodiment, two tape fusion lines 5 are provided, but three or four or more tape fusion lines 5 may be provided, but at least one tape fusion line exists outside the unsealed portion. is necessary. If both end edge lines 3 of the bag film are brought close to each other and are not brought into contact with each other, it is possible to fuse the tape film with a width to cover the both end edge lines 3 with one tape fusion line. When the number of tape fusion lines is one, the bag film has double-sided heat-bonding properties. Therefore, if the edge portions of the bag film are in contact with each other or overlap each other, the heat generated when the peeling tape 4 is fused is improved. In this case, the films in the unsealed portions are heat-sealed to each other, and even if the peeling tape 4 is peeled off, the unsealed portion 2 may not be unsealed.

Reference numeral 6 is a horizontal fused portion. The non-fusing part 7 of about 1 cm is left outside the horizontal fusing part 6, and the peeling tape 4 is not fused on the non-fusing part 7. As a result, the release tape 4 floats above the non-fusing part 7,
A tab piece 8 was formed which can be easily pinched with fingers.
The peeling tape 4 is delaminated in the peeling layer by pinching and pulling the knob piece 8, the two edge lines 3 closed by the peeling tape are opened, and the sealing bag 1 is opened as shown in FIG. . The knob piece 8 may be 5 mm, but preferably 7 mm or more is easy to open.

In FIG. 2, 9 is a base layer of a bag film, and 10 is a heat-fusible layer. Reference numeral 11 is a heat-fusible layer of the release tape, and 12 is a release layer. Reference numeral 13 in FIG. 3 denotes boiled noodles which are the contents of the sealed bag.

In this embodiment, since it is possible to open from the central portion of the sealed bag, not only is it easy to open even contents such as boiled noodles that stick to the bag and are difficult to remove, but also open. The contents can be easily removed from the bag later. Moreover, since there is no overlapped portion of the bag material, there is an effect that the amount of film used per bag can be saved. Moreover, the conventional machine can be used as it is by mounting a few attachments.

Embodiment 2 FIG. 4 is a plan view of the surface provided with the unsealing portion of Embodiment 2, FIG. 5 is an end view taken along the line VV of FIG. 1, and FIG. 6 is a perspective view showing the unsealed state. .

Reference numeral 1 is a sealed bag, and the same film as in Example 1 was used. Reference numeral 2 denotes an unsealed portion, 3 denotes an edge line of the bag film, and in this example, the edge lines of the bag film are overlapped. The peeling tape 4 was sandwiched between the overlapped portions, and the insides of the overlapped end edge lines 3 were fused. Therefore, one tape fusion line 5 is sufficient in this embodiment. The width of the tape fusing line 5 can be appropriately determined according to the fusing strength required for the bag.

As the peeling tape 4, a double-sided heat-fusible peeling tape having an unstretched polypropylene layer on the corona-treated polyethylene layer of the peeling tape used in Example 1 was used. Either 5 mm or more, preferably 7 mm or more, and more preferably 10 mm or more are not fused from the vertical fusion bonding portion to either one of the edge lines 3 ′ located outside the overlapped edge lines or the peeling tape 4, or both. And left as the opening site 14. By pinching the opening portion 14 and pulling it in the direction of peeling the peeling tape, interlayer peeling of the peeling tape occurs with a relatively weak force, and the peeling tape can be opened from the central portion of the sealing bag.
The contents could be easily taken out as shown in FIG.
When the purpose is to open the opening part widely, it is difficult to open if there is a large amount of bag film overlap in the opening part, so it is possible to reduce the bag film overlap and to put it outside the tape fusion line of the release tape. Lengthening the exposed opening portion 14 facilitates opening.

Reference numeral 6 is a horizontal fusion bonding portion. In the present embodiment, since the unsealing is performed by the unsealing portion 14 formed of the non-fusion film on the outside of the tape fusion line 5, it is not necessary to leave the non-fusion part on the outside of the horizontal fusion bonding part 6. However, for the sake of bag making, it does not matter if there is a non-fused portion.

In FIG. 5, 9 is a base layer of a bag film, and 10 is a heat-fusible layer. Reference numeral 11 is a heat-fusible layer of the release tape, and 12 is a release layer. In FIG. 5, it seems that there are two tape fusion lines, but by pressing up and down, the films on both sides sandwiching the portion expressed as the tape fusion line 5 in FIG. Actually, three films are melted and adhered to each other at the tape fusion line 5. Reference numeral 13 in FIG. 6 is boiled noodles, which is the content of the sealed bag.

In this embodiment, since it is possible to open from the central portion of the sealed bag, not only the contents such as boiled noodles that stick to the bag and are difficult to remove are not only easy to open, but also unsealed. The contents could later be easily removed from the bag.

Embodiment 3 FIG. 7 is a plan view of a surface provided with an opening portion of Embodiment 3, and FIG. 8 is a perspective view showing an opened state. In this embodiment, a so-called stand pack 21 having a gusset at the bottom was used as a sealed bag. In a stand pack, generally only the inner surface of the bag film is heat-fusible, and a tough film having a relatively strong elasticity is used. A cutting line 22 in substantially the same direction as the gusset was provided on the upper side of the film for stand pack opposite to the gusset. The cutting line 22 is further covered with a peeling tape 4 having almost the same width as the bag reaching the vertical fusion bonding lines 26,
Only the periphery of the cutting line 22 is heat-fused and the peeling tape-fused part 2
Formed 3. Thereafter, the stand pack 21 was filled with the content from the opening on the side opposite to the gusset, and the filled opening was horizontally fused and sealed. 24 is a horizontal fusion bonding part,
25 is a gusset.

In this example, a film having an oriented 6-nylon as the outermost layer was used as a stand pack,
As the release tape, a tape made of polyester / release layer / heat-fusible nylon was used. Oriented 6-nylon is not heat-fusible but has an affinity for the heat-fusible nylon layer and could be heat-bonded to each other.

In the present embodiment, the cutting line 22 has a short width which does not come into contact with the vertical fusion splicing lines 26 provided on both sides of the stand pack 21 due to fear of water leakage when filling a content rich in water. The cutting line may be longer or the same as the bag width. However, when the cutting line is short as in the present embodiment, the tape fusion portion 23 is naturally short, and the release tape in a state where it is not fused and floats outside the tape fusion portion 23 remains, Form the strip 8. It has an advantage that it can be easily opened by pinching and pulling the knob piece 8. When a double-sided heat-fusible film is used as the bag film, the tape-fusing part is preferably provided with at least one fusion-bonding line sandwiching the cutting line 22 as in Example 1. .

In the present embodiment, the stand pack, which could not be opened without using cutting means such as scissors, can be easily opened by hand as shown in FIG. Furthermore, there is no risk of liquid leakage during distribution and storage.

Example 4 FIG. 9 shows, as Example 4, the case where the bag film had heat-sealing properties only on the inner surface and one end of the sealing bag was to be opened to take out the contents. The sealed bag used in the present embodiment may be a four-sided seal type and may be provided with an unsealed portion in addition, or may have one of the folded portions 27 as shown in FIG. 4, or a stand pack. It may be a gusset fold bag. In this example, since the outer surface of the bag is not heat-fusible, it cannot be fused by using the same release tape as that used in Example 1. Bend both ends of each of the two and fold the folded surface 28 of the two rows.
Were placed in contact with each other. Then, a peeling tape was placed on the folding line 29, and the folding line 29 was heat-sealed. Reference numeral 26 represents a vertical fusion line, which was filled with the content from an opening opposite to the folded-back portion 27, and then the opening was horizontally fused. Reference numeral 24 is a horizontal fusion-bonded portion.

In opening, the peeling tape 4 on the outside of the vertical fusion-bonding wire 26 may be left unfused to open it from the outside of the vertical fusion-bonding wire 26 as in the case of the first embodiment. Alternatively, by leaving a wide non-fusing part outside the tape fusing line 5, the non-fusing part can be pulled to open the tape.

In the present embodiment, even a normal sealing bag made of a film having a heat-fusible layer only on the inner surface can be tape-sealed from the outside according to the present invention, and can easily be sealed from one end. It can be opened by hand, and has the advantage that it is easy to take out, especially when storing long contents.

In each of the above examples, the tape having the heat-fusible layer was used as the release tape, but a tape having an adhesive layer instead of the heat-fusible layer may be used. In this case, resealing property can also be provided. Furthermore, even if the surface of the sealed bag is not a heat-fusible layer,
If a release tape having a special layer having an affinity for the surface layer is used, the release tape can be fused to the opening part.

[0032]

According to the present invention, it is possible to manufacture a sealed bag which has a relatively small peel strength and is free from the possibility of bag breakage, and moreover, can be easily opened by hand only by peeling off the peeling tape. .

[Brief description of drawings]

FIG. 1 is a plan view of a side of a sealed bag according to an embodiment of the present invention on which a vertical fusion bonding portion is provided.

FIG. 2 is an end view taken along line II-II of FIG.

FIG. 3 is a perspective view showing a state during opening the package.

FIG. 4 is a plan view of a surface provided with an opening portion according to the second embodiment.

FIG. 5 is an end view taken along line VV of FIG.

FIG. 6 is a perspective view showing an opened state.

FIG. 7 is a plan view of a surface provided with an opening portion according to the third embodiment.

FIG. 8 is a perspective view showing a state where the stand pack is opened.

FIG. 9 is a plan view of a surface provided with an opening portion according to the fourth embodiment.

[Explanation of symbols]

 1 Sealing Bag 2 Opening Part 3 Edge Line 4 Peeling Tape 5 Tape Fusing Line 6 Horizontal Fusing Part 7 Non-fusing Part 8 Knob Piece 9 Base Layer 10 Heat-Fusable Layer of Bag Film 11 Heat of Release Tape Fusing layer 12 Release layer 13 Boiled noodles 14 Opening part 21 Stand pack 22 Cutting line 23 Tape fusing part 24 Horizontal fusing part 25 Machi 26 Vertical fusing line 27 Folding part 28 Folding face 29 Folding line

Claims (4)

[Claims] 1. A sealed bag made of a film having heat-fusible layers on both sides, wherein both edges of the bag film are close to, in contact with or overlap with each other on one surface of the sealed bag. And a peeling tape which covers the opening and has a heat-fusible layer as an adhesive surface to the bag film.
Easy-to-open tape-sealed bag, wherein the two innermost tape fusion lines are present outside the edge lines of the two films while being fused with two tape fusion lines . 2. A hermetically sealed bag made of a film having a heat-fusible layer on both sides, wherein both ends of the film are overlapped to form an unsealed portion on one surface of the hermetically sealed bag. A peeling tape having a heat-fusible layer on both sides is interposed between the films and is heat-sealed, and one or both of the bag film and the peeling tape are provided outside the tape-fusing part. An easily-openable tape-attached hermetically sealed bag, characterized in that the portion remains unfused. 3. A sealed bag having at least an inner surface made of a film having a heat-fusible layer and having a gusset sandwiched at the bottom of the bag to impart standing property, wherein the gusset on one surface of the sealed bag is In the opposite direction, a cut line that is substantially parallel to the sandwiched gusset is provided to form an unsealed portion, and the unsealed portion is covered, and a peeling tape whose bag film adhesive surface is a heat-fusible layer is fused. A sealed bag with an easy-to-open tape attached. 4. A hermetically sealed bag made of a film having a heat-fusible layer on the inner side, wherein the end of the one side of the bag close to the fusion line in the vertical direction or the horizontal direction has a vertical direction or a horizontal direction. In the release tape, both ends of the film are bent outward so as to be parallel to the fusing line, and two rows of folding lines are formed to cover the folding lines of the two rows and the inner surface is a heat-fusible layer. A sealed bag with an easy-open tape attached, which is characterized by being fused.