JP2596556Y2 - Easy-open plastic bag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bag which can be easily opened using a cutting thread.

[0002]

2. Description of the Related Art FIGS. 16 and 17 show one type of a synthetic resin bag which can be easily opened using a cutout thread.

[0003] As shown in both figures, such a synthetic resin bag B is formed by heat-sealing the peripheral edges of two synthetic resin films 50 and 51 to form a peripheral seal portion 52 and has a storage space 53 therein.
The bag body 54 and the bag body 54 are heat-sealed to the inner surface on one side along the opening position, and both ends are heat-sealed to the corresponding portions 52a and 52b of the peripheral seal portion 52. A cutting piece 55 (U) formed by cutting the cutting thread 55 and the corresponding portion 52a on one side of the peripheral seal portion 52 of the bag body 54 so as to be peelable integrally with one end of the cutout thread 55
(Consisting of a U-shaped slit 56a and a long groove 56b).

When opening such a synthetic resin bag, the knob 56 is gripped with a finger, and as shown in FIG.
By pulling along the 57, the synthetic resin film 50 can be easily opened by tearing the synthetic resin film 50 with the cutting thread 55.

[0005] However, such synthetic resin bags still have the following problems to be solved.

[0006]

That is, as shown in FIG. 16, the peripheral sealing portion of the synthetic resin bag B is usually used.
52 has the same heat welding width over the entire circumference, but in the portion where the knob 56 is provided, in order to secure the strength in the same portion, the boundary line between the peripheral seal portion 52 and the storage space 53 is provided.
58 needs to get inside.

Accordingly, after the bag body 54 is cut by scissors or the like along a virtual cutting line immediately above the cutting thread 55, the cutting opening
When removing the filling from 59, the width of the cutting opening is
Since it was narrower than the width of the other parts, it was difficult to take out the filler, and similarly, the operation of filling the filler inside was also difficult.

An object of the present invention is to provide a synthetic resin bag which can solve the above-mentioned problems.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a bag body in which peripheral edges of two front and rear walls are heat-fused to form a peripheral seal portion and a storage space is formed therein, and one side of the bag body. On the inner surface, heat-sealed along the opening line, cut both ends, a cut-out thread that is heat-sealed in a state of being sandwiched between corresponding portions of the peripheral seal portion, and a portion corresponding to one side of the peripheral seal portion of the bag body, In a synthetic resin bag that is easy to open and includes a notch thread and a knob piece formed so as to be integrally peelable, a peripheral seal portion provided with the knob piece bulges outward to form an ear portion, The present invention relates to a synthetic resin bag characterized in that the same ear portion is cut out and the above-mentioned knob is provided.

[0010] The present invention also provides a method for heat-sealing a peripheral edge of a bottom wall interposed between two front and rear walls and a lower end of the front and rear walls and having both side edges bent downward in a mountain shape. A bag body that forms a sealing portion and forms a storage space inside, and is heat-sealed along an opening line to one inner surface of the bag body so that both ends are sandwiched between corresponding portions of the peripheral seal portion. Cut the notched thread that has been heat-sealed and the corresponding portion on one side of the peripheral seal of the bag body.
In an easily-openable synthetic resin bag having a cut piece formed integrally with one end of a cutout thread and an easily peelable piece, a peripheral seal portion provided with the piece is bulged outward to form an ear, The present invention relates to a synthetic resin bag characterized in that the same ear portion is cut out and the above-mentioned knob is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A synthetic resin bag A according to the present invention will be specifically described below with reference to the embodiment shown in the accompanying drawings.

In FIG. 1 to FIG. 13, 10 is substantially
A bag body made of a synthetic resin in which the entire circumference of two substantially rectangular front and rear walls 11, 12 and a single rectangular bottom wall 13 in a side view are sealed in a sealed state by heat fusion or the like. As shown in FIGS. 1, 8 and 9, in a filled state, a storage space 14 for storing dried fruits and other fillers F is formed therein.

Also, the bag body 10 is shown in FIGS.
As shown in FIG. 1, the cutting thread 15 is heat-sealed to the inside upper part of the rear wall 12 of the straight cylindrical portion 10a forming the upper part of the bag body 10. The cutting thread 15 extends in a direction crossing the bag body 10, and both ends thereof end at outer ends of the left and right peripheral seal portions 22 and 23 of the bag body 10.

Further, a knob 17 is connected to one end of the cutting thread 15, and the knob 17 is picked up and pulled together with the cutting thread 15 to cut the rear wall 12 and open the upper part of the bag body 10. be able to.

As shown in FIGS. 1 and 2, the bag body
10 has a sealing fastener 18 below the cutting thread 15 and extends in parallel with the cutting thread 15.

The sealing fastener 18 is shown in FIGS.
As shown in the figure, a long female member 19 having a U-shaped cross section is
A long fitting ridge 21 which is welded to the inner surface of the rear wall 11 and is removably fitted to the inner surface of the rear wall 12 with the fitting groove 20 of the female member 19.
Are formed.

With this configuration, the bag thread 10 is cut by the cutting thread 15.
Is cut off, the sealing fitting between the fitting groove 20 and the fitting ridge 21 is released, and a part of the filling F is taken out. Then, the fitting groove 20 and the fitting ridge 21 are sealed again. The fitting prevents moisture and prevents freshness of the filling F as long as possible.

The present invention is characterized in the structure for attaching the knob 17 in the synthetic resin bag A having the above-described structure.

The knob 17 is substantially formed by a left peripheral seal portion.
A semicircular ear 37 projecting outward from the edge of 22;
37, a U-shaped notch slit 38 located inside from the outer end of the bag 37, and a transverse opening groove 39 at a position adjacent to the notch slit 38 and close to the inside of the bag body 10.
And formed from

The notch slit 38 is formed in the left peripheral seal portion 22.
Circular cut 38a spaced from the lateral outer edge of
And a pair of side cuts 38b and 38c provided symmetrically on both sides of the cutting thread 15.

The inner ends of the side cuts 38b and 38c are
It is straight or inclined to the cutting thread 15 so that it can be connected well to the transverse groove 39 when the 17 is pulled.

As shown in detail in FIG. 13, the transverse groove 39 is formed between the inside of the bag body 10 and the side cuts 38b and 38 of the notch slit 38.
The cutting thread 15 is traversed with the inner end of c. Further, the cutting thread 15 passes through the central portion of the transverse groove 39.

The transverse groove 39 has a length L ₁ traversing the cutting thread 15, which corresponds to the side cut 38 of the cutout slit 38.
b, 38c are larger than the distance D between the inner ends, so that when the knob 17 is pulled upward, the side cuts 38b, 38c
Can reliably reach the transverse groove 39 exactly.

Further, the transverse groove 39 has an inner tapered end 39a provided on the cutting thread 15 and adjacent to the inside of the bag body 10. The inner tapered end 39a has an angle of 90 ° or less with respect to the cutting thread 15 as measured from the open end toward the inside of the bag body 10. With the above configuration, the cutting thread 15 can be always guided on the line of the transverse groove 39. The end of the cutting thread 15 is
This end is sandwiched between the front and rear walls 11 and 12 of the peripheral seal portion 22.

Further, as described with reference to FIG. 13, the knob 17 is provided on the semicircular ear 33 protruding outward from the outer edge of the left peripheral seal portion 22. .

Therefore, as shown in FIGS. 2 and 13, the boundary line b between the peripheral seal portion 22 and the storage space 14 is straightened over the entire length of the bag body 10 without bulging inward. The filling operation and the unloading operation of the filling material F into the storage space 14 of the bag body 10 can be performed smoothly.

Further, even when the user holds the ear portion 37 when handling the bag body 10, the left edge sealing portion 22
Since the ears 37 are continuously provided in the bag body 10, the knob 17 is not pulled and the cutting thread 15 does not open the bag body 10, so that trouble during handling can be prevented.
Note that the shape of the ear portion 37 is not limited to a semicircular shape at all, and may be a rectangular shape or a triangular shape.

Further, in this embodiment, the tab 17, as shown in FIG. 13, with comprises a color mark M ₁ of a different color with the bag body 10 in its periphery, in its interior, the tab display unit It has a M _2. Then, the knob piece display unit M _2, "TA
B "is displayed. Color mark M ₁ is the bag body A
If it has a clear contrast with the color of
Any color may be used.

By providing the color mark M ₁ and the knob display section M ₂ , the position of the knob 17 can be easily visually recognized, and the pulling direction of the knob 17 or the notch direction of the notch 15 can be obtained. The notch operation can be performed easily and smoothly.

Other structural features of the above embodiment will be described below.

As shown in FIG. 2, the bag A made of synthetic resin according to the present embodiment has the bag
The front shape of 10 is substantially trapezoidal.

That is, the front and rear walls 10, 11 constituting the bag body 10
Are, as shown in FIG. 2, upper straight portions 11a and 12a, respectively.
And lower tapered portions 11b and 12b whose widths gradually increase downward starting from the ends of the upper straight portions 11a and 12a.

In the bag body 10, the pair of front and rear walls 11, 12 each having a substantially trapezoidal shape are overlapped, and a bottom wall 13 bent upward into a mountain shape is inserted between lower ends thereof. The peripheral edges of the front and rear walls 11, 12 except for the lower edge,
The left and right peripheral seal portions 22 and 23 and the upper peripheral seal portion 24 are formed by heat fusion, and the lower end edges of the front and rear walls 11 and 11 are heat fused to the corresponding lower end edges of the bottom wall 20 to form a pair. Are formed at the lower peripheral edge seal portions 25, 26. In addition, as described later,
In order to expand the rectangular mountain-shaped bottom wall 13 into a rectangular flat shape,
The lower peripheral seal portions 25 and 26 are not integrally heat-sealed.

The lower end edges 22 of the left and right peripheral seal portions 22, 23 are provided.
a, 23a, the upper portion of the bottom wall 13 in the folded state by the height H, and both side edges 25a,
The lower ends of the front and rear walls 11, 12 and the corresponding lower end of the bottom wall 20 are thermally fused along a line connecting the inner portions of the heights 25b, 26a, 26b by an amount substantially equal to the height H. And form oblique cut seals 27, 28, 29, 30. As described later, in order to expand the bottom wall 13 of the inverted trapezoidal mountain shape into a rectangular flat shape, the oblique cut seal portions 27, 28 and 29, 30 are similar to each other at the lower end peripheral seal portions 25, 26. Not heat welded.

The front and rear walls 11, 12 and the bottom wall 13 are preferably manufactured by laminating a required number of synthetic resin films, respectively, as shown in FIG. The bag body 10 in which a sealed storage space 14 is formed is formed by heat-welding the periphery of the base 12 and the bottom wall 13 in a pressurized state using a heat seal bar or the like.

By adopting the above configuration, FIGS.
As shown in FIG. 5, in a state in which the storage space 14 has not yet been filled with the filling material F, the synthetic resin bag A has a flat side shape or a side cross-sectional shape, and gradually decreases from the upper end to the lower portion. It has a trapezoidal front shape whose width is expanded in a tapered shape.

On the other hand, when the filling F is filled inside,
The bottom wall 13 folded into an inverted trapezoidal mountain shape is shown in FIGS.
As shown in FIG. 2, the bag is expanded in the front-rear direction to form a rectangular flat surface, and a sufficiently large storage space 14 is formed inside the bag body 10 as shown in FIGS. That is, the storage space 14 can be filled with a sufficient amount of the filler F.

As shown in FIGS. 1 and 10, the bag body 10 has a bottom wall 13 which expands in the front-rear direction in a filled state and which has a sufficient contact area such as a rectangular shelf having a sufficient width. Can be placed on a shelf or the like in an independent state, which is convenient for storage and display.

Further, when the bag body 10 is filled with a certain amount of the filling material F, as shown in FIG. 1, the bottom wall 13 not only expands in the front-rear direction to change from a chevron shape to a flat shape, The upper and lower front and rear walls 11 and 12 also swell around the center in the front and rear direction, except for the upper part where the filler F is not filled. As a result, as shown in FIGS. As described above, while the width of the upper portion not filled with the filler F is maintained as it is, the width of other portions filled with the filler F is reduced.

However, as described above, in the present invention, in the unfilled state, that is, when the side surface is flat as shown in FIG. 2, the synthetic resin bag A gradually increases from the upper end to the lower end in a front view. Because its width is expanded in a tapered shape,
When the bag body 10 is filled with the filling material F, as shown in FIGS. 1 and 4, even if the width of the portion where the bag body 10 is filled with the filling material F becomes narrow, the width of the narrowed portion is It is only approximately equal to the width of the upper part, and does not become extremely narrower than the width of the upper part.

Therefore, when placed on a shelf or the like, it can be placed in an extremely stable state.

Therefore, in the operation of placing or removing the synthetic resin bag A on a shelf or the like, it is possible to prevent only the upper portion of the synthetic resin bag A from contacting only the upper portion of the adjacent synthetic resin bag A. , Can be brought into contact over the entire length of the left and right side edges, and the accidental fall of the synthetic resin bag A can be reliably prevented.

Further, as shown in FIG. 1, the synthetic resin bag A according to the present invention visually gives a stable impression to the purchaser and promotes the purchase will.

Further, the synthetic resin bags A placed adjacent to each other on a shelf or the like can be brought into close contact with each other over the entire length of the left and right side edges. Wasteful space occurs, and the number of synthetic resin bags A that can be placed on a unit length area such as a shelf can be increased.

Particularly, in the present embodiment, the oblique cut seal portions 27, 28,
The dimensional relationship of 29 and 30 is set to the following values.

That is, the width W ₁ of the upper inner opening of the bag body 10 and
And the width W ₂ between the lower end of the beveled sealing portion 27 and 29 (28, 30), the relationship between the width W ₃ of the upper ends of the beveled sealing portion 27 and 29 (28, 30), W ₂ <
It is set to W ₁ <W _3.

By setting the width relation of the synthetic resin bag A in this way, when the filling F is filled in the bag body 10, as shown in FIGS. Can have a stable box shape.

In the present embodiment, when the filling material F is filled in the bag body 10, as shown in FIGS. 1, 6, 9, and 10, the oblique cut seal portions 27, 28 and 29, respectively. The portion sandwiched between 30 forms vertical walls 13a and 13b of an isosceles triangle shape.

However, in this embodiment, the left and right peripheral seal portions
The lower end portions of the front and rear walls 11, 12 forming both sides of the lower end portions 22b, 23b of the 22, 23 form skirt portions 31, 32, and the skirt portions 31, 3 are formed.
2 hides the above-mentioned vertical walls 13a, 13b, so that the appearance of the synthetic resin bag A is not impaired. In addition, the skirt part
31 and 32 can also be subjected to desired printing.

Further, as shown in FIG.
1 and 32, the lower end portions 22b and 23b of the left and right peripheral seal portions 22 and 23, and the both edge portions 25a and 26 of the lower peripheral seal portions 25 and 26.
a, 25b and 26b have the following relationship.

That is, the lower end portions 22 of the left and right peripheral seal portions 22, 23
b and 23b, as shown in FIG. 11, the bag body 10 has a constant taper angle α in a state where the filler F is not filled, but the same taper angle α has the same taper angle α as that of the lower peripheral seal portions 25 and 26. Both edges 25a, 26a, 25b, 26b are also provided, and lower end portions 22b, 23b of left and right peripheral seal portions 22, 23 and lower end peripheral seal portions 25,
The angle β between the two edges 26a, 26a, 25b, and 26b is approximately 90 °.

Therefore, when the bag body 10 is filled with the filling material F, the lower end portions 22b and 23b of the left and right peripheral seal portions 22 and 23 support the bag body 10 as shown in FIGS. It is perpendicular to the mounting surface of the shelf or the like, but at the same time, both edges 25a, 26a, 25b, 26b of the lower peripheral seals 25, 26 and the skirt 3
All of the lower edges 1, 32 also abut the mounting surface of the shelf or the like, so that the synthetic resin bag A can be stably and beautifully supported in the shape of a shelf or the like.

As shown in FIG. 12, in this embodiment,
The cutting yarn 15 has a three-layer concentric structure, and the central yarn 34
, An intermediate adhesive layer 35, and an outer heat-sealing layer 36. The outer heat welding layer 36 is fixed to the center yarn 34 by an intermediate adhesive layer 35.

The center yarn 34 is preferably made of polyester, and preferably has a circular cross section. However, the center thread 34 may have an elliptical, polygonal, etc. cross-section, or may have splines on its outer surface.

The intermediate adhesive layer 35 is formed by coating the central yarn 34 with neoprene.

However, the intermediate adhesive layer 35 can be made of nitrile rubber made of epoxy polyamide.

The outer heat welding layer 36 is preferably made of polypropylene, and is formed so as to be concentric with the intermediate adhesive layer 35. However, the outer heat welded layer 36 can be made of polypropylene or a copolymer of polyethylene and polypropylene.

The cutting yarn 15 having such a three-layer structure can be fixed to the inner surface of the rear wall 12 of the bag body 10 by welding the outer heat welding layer 36 over the whole.

However, the cut yarn 15 does not necessarily have to have a three-layer structure, and may have a single-layer structure.

Incidentally, the synthetic resin bag A in the present invention can be manufactured by mounting it on an automatic manufacturing line. In this case, the side edges of the trapezoidal front and rear walls 11 and 12 constituting the bag main body 10 are not formed. It can be performed by a punching process in addition to a normal cutter. In the case of punching, since a bendable thin blade is used, the same side edge can be formed not only in a straight line but also in an arbitrary curved line, and the overall shape of the synthetic resin bag A is improved in stability. It is possible to make the shape according to the taste of the consumer while securing.

FIGS. 14 and 15 show a modification of the synthetic resin bag A described above. The modification shown in FIG. 14 is a case where the bag body has a wide structure, and the modification shown in FIG. An example is
It is characterized in that the skirt portions 31 and 32 are not required. That is, in terms of aesthetics, the synthetic resin bag A according to the present modification is inferior to the synthetic resin bag A shown in FIGS. The bag A is superior to the synthetic resin bag A shown in FIGS.

In the above-described embodiment, as an embodiment to which the present invention can be applied, the bag main body 10 substantially has the entire periphery of two substantially rectangular front and rear walls 11 and 12 and one It is made of a synthetic resin in which a bottom wall 13 having an inverted trapezoidal shape in a side view is hermetically sealed by heat fusion or the like.

However, the bag body 10 to which the present invention can be applied is:
The invention is not limited to the bag body 10 described in the illustrated embodiment.For example, the front and rear walls 50 and 51 having no bottom wall, such as the bag body 54 described with reference to FIGS. 16 and 17. It is needless to say that the present invention can be applied to a bag body composed only of a bag.

[0064]

As described above, according to the present invention, a bag main body that forms a peripheral sealing portion by forming the peripheral edges of the two front and rear walls by heat welding, and a storage space inside the bag main body; Cut the notched thread that is heat-sealed on the side along the opening line, and both ends are heat-sealed in a state of being sandwiched between the corresponding portions of the peripheral seal portion, and the corresponding portion on one side of the peripheral seal portion of the bag body. In an easily openable synthetic resin bag having one end of a thread and a knob formed integrally and releasably, a portion of a peripheral seal portion provided with the knob bulges outward to form an ear portion, and The above-mentioned knob is provided by notching the ear.

Accordingly, at the upper part of the bag body, the boundary line between the peripheral seal portion and the storage space can be straightened over the entire length without bulging inward, so that the filling space in the storage space of the bag body is filled. Filling and unloading work can be performed extremely smoothly, and even if you hold the ear when handling the bag body, the handle is not pulled and the bag body is not opened by the cutting thread.
Trouble during handling can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin bag according to the present invention in a stored state.

FIG. 2 is a front view of the synthetic resin bag in an unstored state.

FIG. 3 is a side view of the same.

FIG. 4 is a cross-sectional side view taken along the line II of FIG. 2;

FIG. 5 is an enlarged sectional side view of the main part.

FIG. 6 is a front view of the synthetic resin bag in a housed state.

FIG. 7 is a side view of the same.

FIG. 8 is a sectional side view of the same.

9 is a sectional front view taken along line II-II in FIG.

FIG. 10 is a bottom view of the same.

FIG. 11 is an enlarged front view of a lower portion of the bag body.

FIG. 12 is a sectional view of a cut yarn.

FIG. 13 is an enlarged front view of a knob forming portion.

FIG. 14 is a front view of a modified example of a synthetic resin bag.

FIG. 15 is a front view of another modification of the synthetic resin bag.

FIG. 16 is a front view of a conventional synthetic resin bag.

FIG. 17 is a perspective view of the same.

[Explanation of symbols]

 A Synthetic resin bag 10 Bag body 11 Front wall 12 Rear wall 13 Bottom wall 15 Cutting thread 17 Knob 22 Left peripheral seal 23 Right peripheral seal 24 Upper peripheral seal 25 Lower peripheral seal 26 Lower peripheral seal 37 Ears Department

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65D 30/00-33/38 B65D 65 / 34,75 / 66 B65D 77/30-77/40

Claims (2)

(57) [Scope of request for utility model registration] The peripheral edges of the two front and rear walls (11) and (12) are heat-sealed to form a peripheral seal portion, and a storage space (14) is provided therein.
The bag body (10) forming the, on one side inner surface of the bag body (10),
Notched thread (15) heat-sealed along the opening line and heat-sealed at both ends in a state of being sandwiched between corresponding portions of the peripheral seal portion, and the bag body (10)
In a synthetic resin bag that is easy to open and is provided with a cut-off portion (17) formed by cutting off a portion corresponding to one side of the peripheral seal portion and a cut-off portion (17) integrally formed with one end of the cutout thread (15), The synthetic resin is characterized in that a portion of the peripheral seal portion provided with) is bulged outward to form an ear portion (37), the ear portion (37) is cut out and the above-mentioned knob (17) is provided. Bag making. 2. The front and rear walls (11) and (12) and the front and rear walls (11) and (12).
The bottom wall (13) with both sides bent downwards in a mountain shape is heat-sealed to form a peripheral seal and a storage space (14) inside. Notched yarn that is heat-sealed along the opening line to the bag body (10) to be sealed and the inner surface of one side of the bag body (10), and both ends are heat-sealed so as to be sandwiched between the corresponding portions of the peripheral seal portion. (15) and a tab (17) formed by cutting off a portion corresponding to one side of the peripheral seal portion of the bag body (10) and forming a peelable piece integrally with one end of the cutout thread (15). In the synthetic resin bag, the peripheral seal portion provided with the tab (17) is bulged outward to form an ear portion (37), and the same ear portion (3
7) A synthetic resin bag, wherein the knob (17) is provided by cutting out 7).