JP2000168797A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently perform a deaeration, prevent bugs from entering, and at the same time, make moisture hard to infiltrate, and prevent the quality reduction of a part to be packaged from occurring by providing an air flowing section which communicates the inside with the outside of a packaging bag, on a remaining one edge in the packaging bag wherein an opening section is provided on one edge, and another edge is bonded. SOLUTION: For this packaging bag 1, one sheet of a plastic film 2 is folded in two and superposed, and two edges on one side being confronted with each other are bonded by a bonding section 4, and at the same time, one edge at the upper section is made an opening section 7. Then, between a plurality of the bonding sections 4, an air flowing passage 8 is provided. That is, the air flowing passage 8 is formed of a gap which is provided along the bonded edges being confronted with each other of the plastic film 2 so that the passage 8 makes the inside communicates with the outside of the packaging bag 1, and may make air flow. By this constitution, the flowing of air for the packaging bag 1 is sufficiently performed, and the putting-in/ taking-out of a content is facilitated, and at the same time, bugs and water are surely prevented from entering the packaging bag 1, and the content is stored for a long period of time at a high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a packaging bag. More specifically, the present invention relates to a packaging bag made of a plastic film having a joining portion on at least one side, wherein the joining portion is provided with an air flow passage communicating inside and outside of the bag.

[0002]

2. Description of the Related Art Conventionally, plastic film packaging bags have been widely used because they can be easily filled and sealed. In cereals, such as rice, several types of bags are prepared according to weight, filled, filled, and used for subdivision. In addition, small wrapping bags made of plastic film are also used for confectionery, dried foods, fertilizers, feeds, and the like in order to similarly sell the products in small portions. After these packaging bags are sealed, the bags inflate due to the effects of storage temperature, irradiation, and the like, so that it becomes necessary to release air. For this purpose, in many cases, (I) an air vent hole 3 having a diameter of about 2 mm is provided on the side surface of the plastic film 2 of the bag as shown in FIG. 1 (a). FIG. 4 is a plan view for explaining the bonding part 4 by peeling off the bonding part 4, and the bonding part 4 is indicated by oblique lines. ]. Also, (II) FIG.
As shown in (b) and (c), both ends of one plastic film 2 are joined, and the inside of the joint is sealed with a ribbon-shaped breathable film 5 to form a tubular shape. There is known a packaging bag in which the lower side is heat-sealed and joined to form a bag. [FIG. 1 (b) is an explanatory view of the packaging bag, and a joining portion and a sealing portion are indicated by oblique lines. FIG. 1 (c)
It is sectional drawing of the XX line of FIG.1 (b), Comprising: The cut surface is shown with oblique lines. ].

[0003] However, when the packaging bag of (I) is placed in a place with moisture or moisture or is exposed to water, moisture enters the bag through a hole provided on the side of the packaging bag, and the contents become damp and mold. There is a risk that the occurrence of rot or rot will occur, thereby deteriorating the taste and quality. In addition, there is a risk that insects may enter through the pores and deteriorate the quality. Further, in the packaging bag of (II), it is difficult for air to escape, and when water comes into contact with the sealed portion, moisture may permeate through the film and deteriorate the quality.

[0004]

The above-mentioned packaging bag has a problem that the air is not sufficiently vented, insects easily enter, moisture easily penetrates, and in the case of foods and the like, the taste and quality are reduced. Was.

The present inventors have made various studies to solve the above problems, and as a result, have completed the present invention. That is, an object of the present invention is to provide a packaging bag capable of sufficiently releasing air, preventing insects from penetrating, and hardly seeping water, and maintaining the quality of a product for a long period of time.

[0006]

According to the present invention, there is provided (1) a plastic film packaging bag having an opening on one side and having at least one other side joined thereto. (2) the side provided with the air flow path is provided with a ribbon-shaped plastic film along the longitudinal direction of the side. (3) The packaging bag according to the above (1), which is sandwiched and joined, (3) the packaging bag according to the above (1) or (2), which has two sides provided with the air flow passages, and (4) the above. The gist of the present invention is the packaging bag according to the above (1) or (2), which has three sides provided with the air flow passages.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 2 is a plan view showing an embodiment of the packaging bag of the present invention, which is peeled off at a joint portion, and FIG.
FIG. 4 is a vertical sectional view taken along line A-B of FIG. 2. In the packaging bag of the present invention shown in FIGS. 2 to 4, one plastic film 2 is folded in two, and two opposing sides (vertical two sides in FIG. 2) of the three sides formed by overlapping are joined together. An opening 7 is formed on one side of the upper part, and an air flow passage 8 described later is formed between the joints 4.

The packaging bag 1 of the present invention has an opening 7 on one side for filling with a filling material, and a joint 4 and an air flow passage 8 on at least one other side. It is necessary that at least one joint 4 and at least one air flow path 8 are provided on the side where the air flow path 8 is provided.

[0009] The air flow passage 8 is formed by filling the packing bag 1 with the filler and then joining the plastic film 2 folded in two so that air can flow through the inside and outside of the bag 1 (in this case, the joining side). Is a gap formed between the films along the two opposite sides, and is formed between the joints 4. In addition, even when two plastic films 2 and 2 ′ are used, and when a ribbon-shaped plastic film 9 described later is used, the air flow path 8 extends along the side to be joined (the plastic film 2, 2 ′). , Ribbon-shaped plastic film).

The packaging bag 1 of the present invention is formed of a plastic film, and when the inflation film formed into a cylindrical shape is used as the material of the plastic film, the bag is formed by joining one side. In the case of a single film, the film is folded in two, three sides are overlapped, and two opposite sides are joined to obtain a bag-like shape. Further, when two films are used, two films having the same shape and the same size are superimposed, and a bag-like shape is obtained by joining three of the four sides. The packaging bag 1 of the present invention obtained as described above may have at least one side to be joined.

The shape of the packaging bag 1 of the present invention is not particularly limited, and may be a triangle or a pentagon, but the packaging bag 1 usually formed in a square or rectangular quadrilateral is used.

Although the size of the packaging bag 1 of the present invention is not particularly limited, it can be applied to a bag of 10 gram unit by filling weight, but is usually used for packing a filling of about 100 g to 50 kg. As vertical 200-1000mm,
Those having a width of 200 to 1000 mm are used. The thickness of the plastic film varies depending on the weight of the filler, but is in the range of 25 to 120 μm.

In the packaging bag 1 of the present invention, the side where the air flow passage 8 is not provided is joined by a method of heat fusion between plastic films which is known as a conventional ordinary plastic heat welding method. be able to.
For example, a hot plate welding method, a heat sealing method, an impulse heat welding method, a hot air welding method and the like can be mentioned.

As a method for obtaining the side having the air flow passage 8, the above-described joining method without the air flow passage 8 can be basically used as it is. The same method can be used to hold a ribbon-shaped plastic film described later. In other words, the same method is used as in the case where the air flow passage 8 is not provided, a portion to be joined and a portion not to be joined are provided, and a portion not to be joined is used as the air flow passage 8. Can also be used. In the present invention, forming a side where the air flow passage 8 is provided, that is, providing a part that is joined to one side and a part that is not joined is hereinafter referred to as “joining processing”.

In the joining process, in order to form a portion to be joined and a portion not to be joined, when a metal hot plate such as a hot plate welding method or a heat sealing method is used, a concave is formed in the metal plate so that heat is not applied. The air flow passage 8 can be provided by molding and using the mold. In order to perform the joining process continuously, the joining portion 4 and the air flow passage 8 can be provided continuously by forming and using an uneven mold on the surface of the rotary heat roll.

As another method of performing the joining process, a method of bonding can be used. The air flow passage 8 can be provided by applying an adhesive to a portion to be joined without applying an adhesive to a portion where the air flow passage 8 is provided, and performing joining. As the adhesive, an adhesive used for bonding a plastic film, a plastic sheet, rubber and the like is used, for example, a urethane adhesive, a hot melt adhesive,
EVA-based adhesives and the like can be mentioned.

For the application of the adhesive, a mold having irregularities is prepared. The adhesive is not applied to the concave portion of the mold, and the adhesive is applied to the convex portion, and the mold is attached to the side of the plastic film. The air flow passage 8 and the joining portion 4 are provided by applying the adhesive by pushing along and joining the films after removing the mold.

In the packaging bag 1 of the present invention obtained as described above, the air flow passages 8 and the joints 4 are formed in a pattern at regular intervals as shown in FIG. Packaging bag 1 shown in FIG.
3 and 4 are vertical sectional views of FIG. FIG. 3 is a vertical cross-sectional view taken along line AA of FIG. 2. At both ends where the bonding process is performed, two films are bonded to form a bonding portion 4. FIG. 4 shows FIG.
FIG. 4 is a vertical cross-sectional view taken along line AA of FIG. 3, in which both ends subjected to the joining process are not joined, and an air flow passage 8 is formed, and a joining portion 4 is formed at a position slightly inside from both ends. The unjoined portions are connected to form a passage (air flow passage 8) so that air can flow between the two films.

In the example shown in FIG. 2, the air flow passages 8 are provided on the left and right sides, but the air flow passages 8 may be provided on any one side. The air flow passage 8 can be provided only on one side or provided on two sides according to the required air release amount or the like. Further, it can be controlled by the size and number of the air flow passages 8 provided on one side. Further, the air flow passage 8 provided on one side may not be provided over the entire length of the side. It may be provided on one side of each side,
It may be provided in the middle of each side, and these may be provided at any position. In addition, when provided on two opposing sides, it is not necessary to provide them symmetrically.

The size and width of the air flow path 8 are not particularly limited, but it is necessary to provide the air flow passage 8 smaller than the size of the filler so that the filler does not go outside. As shown in FIG. The air flow passage 8 may be provided with a portion fused in a shape of an island or an island. By doing so, it becomes difficult for the contents to come out, and it is possible to prevent insects and water from entering. Further, from the viewpoint of preventing invasion of insects and the like and infiltration of water, it is preferable that the width of the air flow passage 8 is small, and the width of the air flow passage 8 is preferably set to a maximum of 20 mm and a minimum of 1 mm. It is more preferably set to 10 to 10 mm.

The shape of the air flow passage 8 is not particularly limited. However, when the air flow passage 8 is provided linearly, it is preferable to provide the air flow passage 8 as narrow as possible in order to prevent water and insects from entering. It is more preferable to provide a winding than a straight line from the viewpoint of preventing water and insects from entering. The number of air flow passages 8 provided on one side depends on the length of one side of the bag, but may be one.
However, in the case of the packaging bag 1 having a length of about 20 cm, it is desirable to provide about 5 to 40 pieces on one side, and in the case of the packaging bag 1 having a length of 45 to 50 cm, 5 -10
It is preferable to provide about zero.

In FIG. 2, the shape of the air flow passage 8 is shown as a fixed pattern, but is not necessarily a fixed pattern and may be an irregular shape. The air flow passage 8 need not be symmetrical. When a mold is used, it is preferable to form the mold into a repetitive mold having a fixed shape because the mold can be easily manufactured and work can be performed easily.

The width of the joining portion provided along each side of the packaging bag 1 (including the case where the air flow path is not provided and the case where the air flow path is provided) is the same on all sides. But may be different. The width may be any width as long as the packaging bag is usually formed. For example, in the case of the packaging bag 1 of 1 kg to 10 kg, the width is preferably 3 to 30 mm.

The following thermoplastic resin can be used for the plastic film 2 used for the packaging bag 1 of the present invention. For example, polyethylene, polypropylene, ethylene-propylene copolymer, polyethylene terephthalate, nylon and the like can be mentioned, and those molded by extrusion molding, blown film molding or the like are usually used.

The plastic film 2 used for the packaging bag 1 of the present invention may contain an inorganic filler such as calcium carbonate and titanium oxide.

FIG. 5 shows another embodiment of the packaging bag 1 of the present invention. FIG. 5 is a plan view created for explaining one embodiment of the packaging bag of the present invention, and the joining portion 4 is indicated by oblique lines. FIG. 6 is a longitudinal sectional view taken along line CC of FIG. 5, and FIG. 7 is a longitudinal sectional view taken along line DD of FIG. FIG. 8 shows a plastic film 2 (hereinafter referred to as a front surface) and a ribbon-shaped plastic film 9 (hereinafter referred to as a rear surface) attached to the plastic film 2 (becoming a front surface) and 2 ′ (becoming a rear surface) before joining in FIGS.
This is described as "ribbon-shaped film 9". FIG. 4 is a vertical cross-sectional view showing a state in which () is sandwiched.

In the example shown in FIG. 5, two plastic films 2 and 2 'of the same size are superimposed and joined along three sides of the superposed plastic films 2 and 2' to form a bag. At this time, along the longitudinal direction of two opposing sides of the three sides, a ribbon-shaped film 9 having the same length as the two sides and wider than the width to be subjected to the bonding process is sandwiched. It is obtained by adjusting the longitudinal ends so as not to go outside from the ends of the two plastic films 2, 2 'which are superimposed, and performing a joining process.

In the example of FIG. 5, the bonding process is performed by using a film wider than the width of the bonding process to the ribbon-like film 9, so that the ribbon-like film 9 is formed into a ribbon shape along the longitudinal direction of the bonding process surface. There is a portion where the joining process is not performed. The part where the joining process is not performed is located between the two plastic films 2 and 2 ′ inside the packaging bag 1 and is free to be joined to any of the two plastic films 2 and 2 ′. The state is maintained, and the free piece 10 is formed.

The packaging bag 1 of the present invention obtained as described above has the joints 4 in a pattern at regular intervals as shown in FIG.
And an air flow passage 8 are formed, and a free piece 10 is provided in connection with them. When the bonding process is performed by sandwiching the ribbon-like film 9 between the two plastic films 2 and 2 ', the gap between each of the two plastic films 2 and 2' and the ribbon-like film 9 is increased. Is formed with an air flow passage 8. In FIG. 6, at both ends of the two plastic films 2 and 2 ′ where the bonding process is performed with the ribbon-shaped film 9 interposed therebetween, all three films are bonded to form a bonded portion 4. In FIG. 7, the two plastic films 2 and 2 'are not joined at both ends sandwiching the ribbon-shaped film 9, but three plastic films are joined at a position slightly inside from both ends.

In FIG. 5, the air flow passage 8 is provided between the two plastic films 2 and 2 '.
Are formed between the plastic film 2 and the ribbon-like film 9 and between the plastic film 2 'and the ribbon-like film 9, and the air-flow passage 8 is formed in two stages, so that the ribbon-like film is formed. The presence of 9 enhances the effect of preventing insect invasion and water seepage. Further, the free piece 10 functions as an obstacle to the air flow passage 8 to prevent the contents from entering and exiting, preventing invasion of insects, seepage of water, and the like. The presence of the free piece 10 can provide a higher effect as compared to the case where the free piece 10 is composed of only two films.

In FIG. 5, the bonding process 2 was performed.
Although the air flow path 8 is provided on the side, the air flow path 8 may be provided on only one side, or the air flow path 8 may be provided on three sides by performing a joining process. Also, as described above, 1
The whole can also be controlled by the shape and number of the air flow passages 8 provided on the sides.

The free piece 10 may be provided over the entire length in the longitudinal direction of the ribbon film 9 sandwiched between the two plastic films 2 and 2 '(see FIG. 5), or may be provided partially. . That is, the bonding process is performed using the ribbon film 9 shorter than the length of the sides of the plastic films 2 and 2 ′ that sandwich the ribbon film 9, and the ribbon film 9 is partially interposed between the plastic films 2 and 2 ′.
May be formed to form the air flow passage 8.

The width of the ribbon-shaped film 9 may be the same as the width of the bonding process of the plastic films 2 and 2 ', but may be smaller. When the ribbon-shaped film 9 having the same width is used, the free piece 10
The bonding process can be performed so that the free piece 10 is not formed. However, the bonding process is performed by shifting the ribbon-shaped film 9 so as to come into the packaging bag 1 with respect to the width in which the bonding process is performed, and performing the bonding process. It can also be provided. Also, when using a ribbon-like film 9 having a width smaller than the width for performing the bonding process,
Ribbon film 9 inside the bag for the width to be joined
The free piece 10 can also be provided by performing the joining process while holding the free piece 10.

For the ribbon-like film 9, the thermoplastic resin used for the plastic film 2 described above can be used, and polyethylene, polypropylene, OPP, C
PP, polyurethane resin and the like are preferred. As the ribbon film 9, a film having a thickness of 10 to 200 μm is used.

In a case where the ribbon-like film 9 is sandwiched between the plastic films 2 and 2 ′ to perform a bonding process to provide the airflow passage 8, a resin different from the plastic films 2 and 2 ′ is used for the ribbon-like film 9. Although it can be used, it is preferable to use a resin having the same type or the same type of monomer. Although the same thickness as the plastic film 2 can be used as the ribbon-like film 9, it is preferable to use a thinner film than the plastic film 2, because it is easy to join and is firmly joined. Further, the number of ribbon films 9 sandwiched between the plastic films 2 and 2 'and subjected to the joining process is not limited to one, and two or more films can be used.

The air flow passage 8 is provided by sandwiching the ribbon-like film 9 between the plastic films 2 and 2 ′, and the free piece 10 is provided.
When 0 adheres to one of the plastic films 2 and 2 ′ in the packaging bag 1, penetration of insects and seepage of water can be prevented, and a higher effect can be obtained.

As another example, as shown in FIG. 9, a bonding process is performed by sandwiching a ribbon-like film 9 on one side (becoming a bottom portion) of a tubular inflation film. By providing the free side 10, the packaging bag 1 of the present invention can also be obtained. Further, in the example of FIG. 9, the bonding process may be performed without holding the ribbon-shaped film 9, and the bonding portion 4 and the air flow passage 8 may be provided.

Further, when the opening 7 is joined at the time of sealing after filling in a packaging bag, the joining process is performed on the opening 7 to provide the joint 4 and the air flow passage 8. The packaging bag 1 can be obtained. Further, after filling the contents into a packaging bag having no side provided with the air flow passage 8, the opening 7
By performing the joining process in the same manner as described above and providing the joining portion 4 and the air flow passage 8, the same packaging bag 1 as described above is provided.
Is obtained. The air flow passage 8 provided in the opening 7 has the same function as the above example, and the same effect can be obtained. Furthermore, the packaging bag 1 having a side where the air flow passage 8 is already provided.
Alternatively, after the filling, the opening 7 may be subjected to a joining process to provide the joining portion 4 and the air flow passage 8.

The packaging bag 1 of the present invention is used for crops such as rice, wheat, corn, beans, sesame, peanuts, dried fruits, spices, dried vegetables and the like, agricultural products such as vegetables and nuts, dried fish and seaweeds. After storing packed sealed items such as marine products such as fish meal, livestock feed, pet feed, fertilizer, confectionery, etc., for any products that may be deteriorated in quality due to the presence of air,
Can be used for its packaging. In addition, it can be used for textile products, paper products, and the like.

Since the packaging bag 1 of the present invention has no holes in the film surface as compared with a conventional packaging bag in which holes are formed in the film surface to release air, the film surface is vertically When stored and touched with water, the water does not permeate, so that there is no fear of deterioration in taste or quality due to moisture, and it can be stored with confidence.

[0041]

The packaging bag of the present invention is a plastic film packaging bag having an opening on one side and joined to at least one other side, and is connected to the inside and outside of the packaging bag. By adopting a configuration having at least one side provided with an air flow passage, air is sufficiently circulated as compared with a conventional plastic film packaging bag. Can be removed, and the contents are hard to get in and out, and the invasion of insects and water can be prevented. Therefore, there is an effect that the food can be held for a long time without deteriorating the taste and quality of the food.

Further, even if the packaging bag of the present invention is stacked sideways when filled and stored, since air holes are not formed in the film surface of the laid bag, water bleeding from the film surface can be prevented. It can be stacked and stored in a warehouse, etc. without worry, without being affected by moisture, moisture, etc. for a long time, preventing mold generation and deterioration in quality due to moisture, and stabilizing the quality for a long time Has the effect that it can be held.

Also, by providing the free piece by sandwiching and joining the ribbon-shaped plastic film of the present invention,
The free piece of the ribbon-shaped plastic film acts as an obstacle in the air flow passage, preventing the invasion of insects and the infiltration of water without obstructing the air flow, so that a higher effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view (a) showing an example of a conventional packaging bag, and a vertical sectional view (c) of the packaging bag shown in the explanatory plan views (b) and (b) of FIG. ).

FIG. 2 is an explanatory plan view showing an example of a packaging bag of the present invention.

FIG. 3 is a longitudinal sectional view taken along line AA of the packaging bag of the present invention shown in FIG.

FIG. 4 is a vertical sectional view of the packaging bag of the present invention shown in FIG. 2, taken along line BB.

FIG. 5 is an explanatory plan view showing another example of the packaging bag of the present invention.

6 is a longitudinal sectional view of the packaging bag of the present invention shown in FIG. 5, taken along line CC.

7 is a longitudinal sectional view of the packaging bag of the present invention shown in FIG. 6, taken along the line DD.

8 is a longitudinal sectional view showing a laminated state of the films before joining in FIGS. 5 and 6. FIG.

FIG. 9 is an explanatory plan view showing still another example of the packaging bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag 2, 2 'plastic film 4 Joining part 7 Opening 8 Air flow path 9 Ribbon-shaped plastic film 10 Free piece

Claims (4)

[Claims] 1. A plastic film packaging bag having an opening on one side and joined to at least one other side, the side provided with an air flow passage communicating with the inside and outside of the packaging bag. A packaging bag having at least one bag. 2. The packaging bag according to claim 1, wherein the side provided with the air flow passage is joined by sandwiching a ribbon-shaped plastic film along a longitudinal direction of the side. 3. The packaging bag according to claim 1, wherein said packaging bag has two sides provided with said air flow passages. 4. The packaging bag according to claim 1, wherein said packaging bag has three sides provided with said air flow passages.