JP3415795B2 - Breathable bag - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a breathable bag,
In particular, it relates to a deaeration bag for containing grains such as rice.

[0002]

2. Description of the Related Art A bag that needs ventilation, for example, a bag containing mainly grains such as rice, should not contain air in the bag when the grains are sealed in the bag. Vents are provided to expel air out of the bag. Conventionally, the ventilation holes have been provided by making small round holes in the synthetic resin sheet or paper that constitutes a synthetic resin bag or a paper bag. There are cases in which water and moisture infiltrate into the bag through the holes, and microorganisms such as mold propagate in the grain in the bag, or dust and pests invade the grain to impair its quality.

Therefore, for example, a double-bonding consisting of a first bonding part and a second bonding part, which are spaced apart from each other, is provided at an edge of a packaging bag body for storing grains such as rice. Sections are formed, and air vent holes are provided in the first and second bonding sections, respectively, to secure a passage for air venting, while the double bonding section makes A packaging bag that improves the bonding strength has been proposed (registered utility model No. 30356).
However, there is a problem in that such a packaging bag has a complicated structure and therefore its manufacturing is troublesome.

Similarly, at least a part of a side edge or an edge of a bag for containing grains such as rice is discontinuously adhered to the opposing surfaces of the surface material and the back surface material of the bag body to form a ventilation hole. And a non-woven fabric tape is adhered to the opposing surfaces of the surface material and the back surface material inside the bag, straddling the edges of the surface material and the back surface material that oppose each other. The inventor has developed a deaeration bag having the above-mentioned structure (see Japanese Patent Application Laid-Open No. 11-180450). However, this bag has a complicated edge structure and is troublesome to manufacture. In the ventilation part, only a small part of the non-woven tape is used, and most of them are used as a connecting part that straddles the surface material and the back surface material, so that the manufacturing is compared. Most of the difficult and expensive non-woven tape is not breathable. There is a problem that will be used in the waste inherent characteristics.

Further, a bag in which a tape such as a non-woven tape is put in a vent hole of a bag for putting grains such as rice has been proposed. It wasn't enough to prevent intrusion.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the current state of the art as described above, and improves the seal strength while ensuring sufficient air permeability, and is capable of removing fine foreign matter. For example, in the case of a rice bag, it is difficult to intrude from the outside, and in the case of a rice bag, it is possible to prevent intrusion of water, moisture, or minute contaminants such as dust, mold, or eggs of harmful insects. It is an object of the present invention to provide a breathable bag which can be easily manufactured without using a breathable tape as described above.

[0007]

To achieve the above object, in the breathable bag of the present invention, a non-seal in which two opposing sheets of the bag body are not directly joined to each other. Vents are provided at the edges of the bag by portions, and a tape having wart-like projections on one or both sides is interposed between the two sheets in the vents.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The breathable bag of the present invention has side edges 1a, 1a ', bottom side, as indicated by reference numeral 1 in the plan view of FIG. Edge 1b
And the side edge portions 1a and 1a 'of the bag 1 are not directly joined to the opposite two sheets 11 and 12 of the bag body. Non-sea
The vent holes 2 formed by the groove portions are intermittently provided.

At the side edge portions 1a and 1a ', a tape 4 having a wart-like projection 5 on one surface is inserted between the sheets 11 and 12, as shown in FIGS. 3 and 4 described below. In this state, the sheets 11 and 12 are intermittently joined to each other at the plurality of seal portions 3 arranged in a line.

Each seal portion 3 has, for example, a rectangular shape, and by providing such a seal portion 3,
The air holes 2 which are non-seal portions are formed between the seal portions 3. Further, the sheets 11 and 12 are joined to each other over the entire surface at the bottom side edge 1b where the vent hole 2 is not provided, and the bottom side edge 1b.
Is totally non-breathable. The ventilation hole 2 may be provided in only one of the side edge portions, or further in the bottom side edge portion 1b, as the case may be.

Such a breathable bag 1 of the present invention can take an appropriate shape and size according to the type and amount of the stored items. For example, when the stored items are cosmetics. It can also be tube-shaped.

FIG. 2 is a longitudinal sectional view in the side edge direction in which a part of the side edge portion of the bag 1 shown in FIG. 1 is enlarged and schematically shown. In the ventilation hole 2 which is shown in FIG. 3, a tape 4 having a wart-like projection 5 on one side as shown in a plan view in FIG. 3 and a longitudinal sectional view in FIG. And 12 are intervening. See
Since there is a space 6 between the projections 5 and between the seats 11 and 12 and a space 6'between the seat 11 and one surface of the tape 4 on the projection side, the ventilation hole 2 is ventilated. On the other hand, since the seal portion 3 is in close contact with each other via the tape 4 so that the sheets 11 and 12 do not leave the void 6 and the void 6 ', Since it is in a sealed state, it is not breathable.

As shown in FIG. 2, in the tape 4, in the non-sealing portion forming the vent hole 2, the base portion 4a having no projection is joined to the sheet 12, and the projection 5 is formed. Although the top portion 5a of the sheet is not joined to the sheet 11, this tape 4 also has a sheet 1 in the vent hole 2.
It does not need to be joined to either of the above-mentioned Nos. 1 and 12, that is, there may be a gap such as the gap 6'which remains on both sides of the tape 4 (in this state, (Not shown), or as shown in FIG. 5, the tops 5a of the protrusions 5 may be joined to the sheet 11 while maintaining the gaps 6 between the protrusions 5. In such a joined state, the void 6 ′ does not remain, but the void 6 maintains the air permeability. As shown in FIGS. 2 to 5, it is sufficient to form the protrusion on one side of the tape, which is convenient for manufacturing the tape, but this protrusion is formed on both sides of the tape. Vents 2 ', which may be formed and which are tapes 4'having protrusions 5'on both sides, as shown in FIG. None of the tops 5'a of 5'may be joined to the sheets 11 and 12, respectively.

In any case, when the tape having the wart-like projection as described above is inserted into the ventilation hole, the projection exhibits a filter action, so that the bag having the ventilation hole. For example, when putting things such as grains such as rice into the mouth while degassing and closing the mouth, the contents may spill out from the ventilation holes due to deaeration, or during transportation and storage after storage. In addition, it is possible to prevent fine contaminants such as dust from entering the bag from the outside through the ventilation holes.

The protrusions 5, although generally preferred to be solid, as shown in FIGS. 2 and 4-6, are shown in plan view in FIG. 7 and in longitudinal section in FIG. Like projection 4 ", this projection may be a hollow projection 5", which is formed, for example, by embossing. These protrusions 5, 5'and 5 "are arranged in a zigzag pattern in a plurality of rows along the longitudinal direction of the tape as shown in Figs. 3, 7, 9 to 11 and 13. Since the filter action by the protrusion of is particularly effective,
For example, this is preferable.

FIG. 1 shows the simplest seal part pattern in which the rectangular joint parts are arranged in a line along the edges 1a and 1a ', but the seal parts are provided in a plurality of lines. For example, as shown in FIG.
0mm x 1.5mm wide rectangular seal part 3
The vent holes 21 and 22 may be formed by arranging the vent holes 1 and 32 in parallel in two rows at a distance of 3.0 mm from each other.

Regarding the arrangement of this seal portion, for example, as shown in FIG. 10, on the outer edge side, for example, the dimensions and arrangement are as follows, that is, the length is 32.0 mm and the width is 2.0 mm. A plurality of wide and long rectangular seal portions 33 are arranged in a row with a spacing of 3.0 mm from each other, and a plurality of narrow and short lengths of 14.5 mm long and 1.5 mm wide on the outside thereof. A number of rectangular seal portions 34 are spaced 3.0 mm apart from each other in a row, and two rows of seal portions 33, 34 are spaced 3.0 mm apart from each other. -The spacing between the ruled parts 33 and 34 is 5.5.
In mm, the seal portion of this double row pattern may be as shown in the drawing (T-shaped air through).

Two rows of seal parts 3 arranged in this way
By arranging 3, 34 with a spacing of 3.0 mm, the ventilation holes 23 and 24 having a width of 3.0 mm are formed in these rows so as not to face each other. The air flowing through the vent holes 23 hits the seal portion 34 and flows through the vent holes 24 as indicated by the arrow, that is, the air inside the bag thus has two rows of vent holes 23. As a result of the zigzag flow through the holes 24, 24, the filter effect of the air holes by the wart-like projections is improved as compared with the air holes arranged as shown in FIG. 1 or FIG. However, of course, such a filter effect can be obtained.

In the case of such a two-row arrangement, for example, as shown in FIG. 11, the inner seal portion 35 has a rectangular shape similar to that of FIG. Alternating shape seal portions 36 and 37, and having the following dimensions and arrangements, for example, a long trapezoid 3
6 is a top base: 16 mm x bottom base: 18 mm, and a short trapezoid 37 is a top base: 11 mm x bottom base: 13 mm, and the distance between these seal portions 36, 37 and 35 is 4.5 m.
It may be m (Y-shaped air-through).

In the case of FIG. 11 as well, the air inside the bag flows in zigzag through the ventilation holes 25 and 26 as indicated by the arrows, so that the filter effect of the ventilation holes due to the wart-like projections is also obtained. improves.

As shown in FIGS. 9 to 11, if the joining portions are provided in two rows, the seal strength can be increased as compared with the case of one row.

The width of the tape is appropriately selected depending on the size of the bag, the thickness of the sheet constituting the bag body, the material and the characteristics, and for example, the width 3 for storing 10 kg of rice.
For a bag made of synthetic resin having a size of 60 mm × length 570 mm, for example, a tape having a width of 10 mm to 15 mm is selected.

The shape of the projection is not particularly limited, but the shape may be generally a truncated cone shape or an elliptical truncated cone shape, and the length of the ventilation hole along the edge and the size of the projection should be appropriately selected. Prevents grains such as rice stored in the bag from spilling out of the bag, and prevents water, moisture, or minute foreign matter such as dust, mold, or pest eggs from entering the bag. be able to.

The length along the edge of the vent to be adopted,
The width of the tape and the size of the protrusions depend on the type and size of the items to be stored in the bag, the shape and size of the bag, and the material and thickness of the sheet constituting the bag body. It is appropriately selected depending on the conditions.

The above-mentioned tape may be generally made of any material as long as the object of the present invention can be achieved. However, if it is a bag used for containing grains such as rice, In particular, it is convenient to use the same material as that widely used as the material for the bag, such as a polyolefin-based material having a hot seal property such as polyethylene or polypropylene, or such a material. When made of a composite material laminated with a synthetic resin film having intersealing properties, the tape is preferably made of the same material.

The bag of the present invention having a vent hole in which a tape having a wart-like projection is inserted has a tape between two facing edges of two sheets which are the main body of the bag. After the insertion, the sheet and the tape are intermittently joined together, that is, sealed so that the air gaps between the air holes do not remain in a close contact state. Manufactured by

This seal is generally easily bonded by bonding, for example, by using a hot melt type adhesive, but in particular, the bag and the tape are hot-sealed like the polyolefin synthetic resin as described above. -If it is made of a material having excellent sealing property, or if it is made of a laminated material covered with such a material, if these are overlapped and intermittently heat-sealed, a seal is formed. Since the joining of the bag and the tape can be achieved more easily, the present invention has the advantage that a bag having a relatively simple structure can be manufactured by a simple manufacturing process.

In this heat seal, for example, if a heat sealer 7 as shown in FIG. 12 which is drawn as a longitudinal sectional view is used, the edge portion of the bag corresponds to this FIG. As shown in FIG. 13, which shows a plan view of FIG. 13, the two-row arrangement of seal portions 31, 3 similar to that in FIG.
2 is formed.

A heat drawn as a longitudinal section in FIG.
Corresponding to the Toshiler-7, as shown in the figure which also shows the edge portion of the bag in FIG. 12 as a longitudinal sectional view,
Tape 4 with wart-like protrusions between two sheets 11 and 12
1, and a heat shield plate 8 made of plate-shaped aluminum coated with Teflon was inserted, and a heat sealer 7 was inserted.
With the rubber plate 9 placed on the opposite side of the sheet 12, the heat sealer 7 moves the sheets 11 and 12 between the sheet and the rubber plate 9 along their edges. When pressed, the pressing heads 7a and 7b of the heat sealer 7 are arranged in two rows of seal portions 32, 32, ... And 31, 3 respectively.
At the same time that the bases 41a of the tape 41 are formed by the pressing heads 7c located inside the edge (that is, on the right side in the drawing) of the pressing head 7b, the base 41a of
The sheet-like portion S indicated by the shaded area is fused to the sheet 11.

The Teflon coated on the heat shield plate 8 serves to prevent the heat shield plate 8 and the tape 41 and the sheet 12 from being fused to each other during this heat seal. The rubber plate 9 is provided under the pressure of the heat sealer 7, and the sheets 11 and 12, the tape 41 and the heat shield plate 8 sandwiched between them are connected to each other. It is provided for transmitting pressure.

According to such a heat seal, a part of the sheet 11 in contact with the pressing heads 7a and 7b, and a part of the tape 41 and the sheet 12 respectively corresponding thereto are gas. , And the two rows of seal portions 32, 32, ... And 31, 31,
... and between the seal portions 31 and 31 and 32 and 32 which are adjacent to each other along the edge.
Ventilation holes 21 and 22 are formed in a state where neither surface of the cap 41 is joined to the sheets 11 and 12, and the sheet 11 in contact with the pressing head 7c and the corresponding sheet.
Although the base 41a of the tape 41 is joined to the base 41a, the one surface of the tape 41 on the protruding side is not joined to the sheet 12 due to the interposition of the heat shield plate 8, and as a result, the tape 41 portion corresponding to the pressing head 7c is formed. That is, the strip-shaped portion S is a tape 4
Since gas is allowed to flow entirely on one side of the projection side of No. 1, for example, when deaerating the air in the bag, the air is as shown by an arrow A in FIGS. 12 and 13. Flows from inside the bag to the outside.

In this heat seal, as shown in FIGS. 1 and 9 to 13, the tape 41 is spread over the entire side edge portion of the bag provided with the vent holes, that is, For example, two strip-shaped sheets 11 and 12 wound on a roll are taken out from the roll in parallel and spread over the entire side edges of the sheets 11 and 12. It is convenient for manufacturing the bag of the present invention that the sheet is intermittently heat-sealed through the tape 41 after being inserted as described above. Simultaneously with or after the toe seal, the side edge portion is cut off along the cutting line L in FIG. 13 to form the side edge portion 1′a of the bag, and the belt-shaped sheet is joined to each other. -Several bags are continuously manufactured by cutting the sheets 11 and 12 at predetermined intervals (not shown). It is.

The above description has been given as an example of a method for manufacturing the bag of the present invention by a heat seal, and here, only one side edge 1'a of the bag is described. However, according to the above description, the other one side edge 1'a '(not shown) is, of course, similar to the one side edge 1'a, and simultaneously in parallel with the heat sheet. This is omitted here as it is easily understood by those skilled in the art.

The bag according to the invention is constructed as described above,
And since it is manufactured as described above, for example, when grains such as rice are put in this bag and sealed, the air remaining in the bag smoothly goes out of the bag. Discharged
After the stored items are once stored in the bag, the two sheets are joined together with the tape interposed therebetween at the seal portion, so that the seal of the bag at the seal portion is joined. -Rail strength is improved by the inclusion of the tape.

In the bag of the present invention, if the sheet and the tape are made of the same material, that is, if, for example, polyethylene is used for both of them, they can be handled together as a kind of material. Therefore, according to the present invention, it is possible to provide a recyclable bag.

Further, in the bag of the present invention, as described above, the edge portion of the bag is reinforced by the presence of the tape, and the seal strength of the edge portion is improved. There is also an advantage that the thickness of the sheet forming the bag body can be reduced.

While the present invention has been described above primarily with respect to a breathable bag used to hold grains such as rice, the bag of the present invention is intended to hold other products or articles. It can also be used as a bag. That is, for example, as a tube-shaped bag having a vent hole at the bottom end for containing cosmetics, or for sterilizing or disinfecting a medical instrument such as food or a needle, the outside of the bag As a bag for introducing a sterilizing gas or a disinfecting gas from the inside to the inside through a ventilation hole and exposing a medical instrument such as a food or an injection needle contained in the bag to these gases, Bags can also be used.

[0038]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is of course not limited to these examples.

Example 1 The breathable rice bag of the present invention was manufactured as follows.

A sheet obtained by laminating a polyethylene film having a thickness of 0.05 mm on one surface of a polyethylene sheet having a thickness of 0.04 mm was used as a sheet for forming a bag body.

As shown in FIGS. 3 and 4, the truncated cone-shaped projections having a diameter of 0.5 mm and a height of 0.3 mm are spaced apart by 1.0 mm from each other in 12 rows (space between rows 1 Width 12 arranged in a zigzag pattern
A polyethylene tape having a size of mm × 0.05 mm was prepared.

First, the tape and the sheet are arranged so that the ends of the side edges of the sheets are aligned between the polyethylene films facing each other on the side edges of the two sheets having a width of 360 mm. −
These sheets are pulled out from the roll with a sheet sandwiched therebetween, and then, using a heat sealer as shown in FIG. 12, the sheets and the sheets piled up as described above are used. The sheet is intermittently heat-sealed to make these two belt-shaped sheets into an integral tubular shape as shown in FIG.
Then, the sheet is sequentially heat-sealed in the lateral direction at intervals of a length of 570 mm, and at the same time, the ends of the heat-sheath are respectively cut to have a width of 360 mm and a length of 570 mm. A rice bag with a capacity of 10 kg was manufactured. As a result, the rice bag with a capacity of 10 kg manufactured in this manner has ventilation holes formed on the both side edges thereof, which are formed by the joint portions having the dimensions and arrangement as shown in FIG. It was

[0043]

As is apparent from the above description, according to the present invention, a costly non-woven tape can be obtained by a simple structure in which the ventilation hole is provided with a tape having a structure useful as a filter. It is not necessary to use it, and while it has sufficient air permeability and sufficient strength of the seal part, it also penetrates minute contaminants such as water, moisture, dust, mold, or pest eggs. An easy-to-manufacture breathable bag suitable for preventing the above is provided, and a bag convenient for recycling is provided when the material of the bag body and the tape are made the same, and further, the tape is provided. As a result of the plug being inserted into the edge of the bag, there is also the benefit of increased edge seal strength.

[Brief description of drawings]

FIG. 1 is a plan view showing an entire bag according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an enlarged part of a vent hole and a seal portion.

FIG. 3 is a plan view of a tape having solid wart-like projections formed on one surface.

FIG. 4 is a vertical sectional view of the tape shown in FIG.

FIG. 5 is a vertical cross-sectional view showing a state of a part of a vent hole and a seal portion when the top portion 5a of the protrusion 5 and the base portion 4a of the tape are joined to the sheets 11 and 12, respectively. .

FIG. 6 shows a tape in which solid wart-like protrusions are formed on both sides, and 5'a of protrusions 5'on both sides thereof are not joined to the sheets 11 and 12, respectively. FIG. 4 is a vertical cross-sectional view showing a part of a vent hole and a seal portion when they are interposed between these sheets.

FIG. 7 is a plan view of a tape having hollow wart-shaped projections formed by embossing.

8 is a vertical cross-sectional view of the tape shown in FIG.

FIG. 9 is a plan view showing the arrangement of the seal portions in which the seal portions are arranged in two rows and the flow of air through the ventilation holes is linear.

FIG. 10 is a plan view showing the arrangement of the seal parts in which the seal parts are arranged in two rows and the flow of air through the ventilation holes is zigzag.

FIG. 11 is a plan view showing the arrangement of the seal portions in which the seal portions are arranged in two rows so that the air flow through the ventilation holes is fan-shaped in a zigzag manner.

FIG. 12 is a view for explaining a heat seal method in the case of forming two rows of seal portions and forming a vent hole in a side edge portion of the bag, in order to perform the heat seal. No hitoshi
It is a longitudinal cross-sectional view showing a peripheral portion of one side edge of the bag sealed by the rail and its heat sealer.

FIG. 13 is a partial plan view of the periphery of one side edge portion of the bag shown in correspondence with FIG.

[Explanation of symbols]

1 bag body 1a, 1a ', 1'a side edge portion 1b bottom side edge portion 1c open end edge portion 11, 12 sheet 2, 21, 22, 23, 24, 25, 26 vent holes 3, 31, 32, 33, 34, 35, 36, 37 see
Part 4, 4 ', 4 ", 41 tape 5, 5', 5" Wart-shaped projection 6, 6 'Void 7 Heat sealer 8 Heat shield 9 Rubber plate L Cutting line S Fusion welding part

Claims (6)

(57) [Claims] 1. A breathable bag in which a vent hole formed at an edge portion of the bag is formed by a non-sealing portion in which two facing sheets of the bag body are not directly joined to each other. And a tape having a wart-shaped projection on one or both sides is interposed between the two sheets in the ventilation hole. 2. The bag according to claim 1, wherein the protrusions are arranged in a zigzag pattern in a plurality of rows along the longitudinal direction of the tape. 3. A tape having a wart-shaped projection on one side thereof, and the other side not having the projection on the non-sealed portion of the tape.
3. The method according to claim 1 or 2, wherein the interposition is in a state of being joined to the
The listed bag. 4. The sheet at the edge of the bag body in the three-layer structure of two sheets facing each other and the tape interposed between the sheets. 4. The bag according to any one of claims 1 to 3, wherein the bags are intermittently sealed to each other via this tape. 5. The bag according to claim 1, wherein the sheet and the tape constituting the bag body are made of the same material. 6. The bag according to claim 1, which is used for storing grains.