JP7023104B2 - How to make and fill packaging bags and packaging bags - Google Patents

Description

The present invention relates to a packaging bag made of a plastic film for filling a liquid substance and a method for filling the bag, and more particularly to a packaging bag capable of stably pouring the liquid substance in the packaging bag over a wide range and a method for filling the bag. ..

Packaging bags made of plastic films have been used for various purposes in the past, and in particular, liquid or viscous objects such as seasoning liquids and sags (hereinafter, simply referred to as "liquid substances") are filled and packaged. It is suitably used for distribution.

For example, the packaging bag of Patent Document 1 by the present applicant is a three-way seal type packaging bag, which has a narrow pouring passage on the folded side side of the plastic film on the upper horizontal seal portion, and the upper side thereof. The spout is configured to be opened by tearing along a tear guide line formed from the upper end of the lateral seal portion toward the pouring passage.

Japanese Patent No. 4152417

In the packaging bag of Patent Document 1, since the pouring passage is gradually narrowed toward the spout, the liquid substance in the packaging bag flows out in a certain direction along the pouring passage, and the pouring outlet is narrow. It has the feature that the liquid material does not scatter and is excellent in the discharge direction by being discharged linearly from, but on the other hand, when it is necessary to discharge the liquid material linearly over a wide range. It was not suitable for its use because it required the packaging bag to be moved large and many times, which was troublesome and time-consuming.

Therefore, an object of the present invention is a packaging bag capable of linearly discharging a liquid substance in a packaging bag in a certain direction and discharging a wide range by one operation, and a bag-making filling method thereof. Is to provide.

As a result of diligent studies to achieve the above object, the inventors have come up with the present invention according to the gist structure described below. That is, the present invention is a packaging bag for filling a liquid substance , which comprises a packaging bag main body made of a packaging plastic film and a bottom wall of the packaging plastic film provided at the lower end of the packaging bag main body. The packaging bag main body extends in the width direction of the packaging bag main body, and has an upper liquid material storage space by an easily peelable seal portion formed by mutual fusion of two overlapping plastic films for packaging. Along with being partitioned into a lower pouring space, the bottom wall is located at the lower end of the pouring space, and at the center thereof, a plurality of liquid materials filled in the storage space are discharged. The packaging bag body and the bottom wall have holes, and the packaging bag body and the bottom wall are composed of a single packaging plastic film folded in the width direction, and the bottom wall is a folded base end of the one packaging plastic film. We propose a packaging bag characterized by having a bifurcated fold portion formed by pushing the central portion of the portion toward the inside in the width direction .

In the above packaging bag,
(1 ) The opening is provided at a position near the center in the length direction of the bottom wall.
( 2 ) The opening has a diameter of 0.3 mm to 2.0 mm.
( 3 ) The accommodation space has a perforated seal portion extending along the easily peelable seal portion at a position separated from the easily peelable seal portion.
( 4 ) The distance between the side edge of the perforated seal portion and the easily peelable seal portion on the side adjacent to each other is 1 mm to 5 mm.
( 5 ) The perforated seal portion presses the accommodation space to apply pressure of a liquid substance to the side edge of the easily peelable seal portion, and the two plastic films overlapping on the side edge. It must be provided at a position where the angle formed between them is 180 ° or less.
( 6 ) The perforated seal portion has a gap formed between the seal portions of 1 to 50 mm.
Is a more preferred solution.

Further, in the present invention, the plastic film for packaging that is continuously fed is folded back in the width direction to overlap the side edges, and the central portion of the folded base end portion is pushed inward in the width direction to form a bifurcated shape. The folding part forming process for forming the folding part and
After the folding portion is formed, the side edges of the laminated plastic films for packaging are heat-sealed in the longitudinal direction to form a vertical sealing portion, and a vertical sealing step of forming a tubular body.
A horizontal sealing step of forming a lower horizontal sealing portion as a bottom and then forming an upper horizontal sealing portion as a top by heat-sealing over the entire width of the tubular body.
A filling step of filling the tubular body with an object to be packaged while the upper horizontal seal portion is formed after the lower horizontal seal portion is formed.
A cutting step of cutting the packaging bag made by each of the above steps into one bag or a plurality of bags.
In the bag making and filling method of the packaging bag
Prior to the folding portion forming step, a perforated processing step for continuously or intermittently forming a plurality of openings is provided at the center portion in the width direction of the packaging plastic film.
Prior to the filling step, the position near the vertical seal portion of the folded portion is continuously heat-sealed in the longitudinal direction with a joint strength weaker than that of the vertical seal portion to form an easily peelable seal portion. We propose a bag-making and filling method for packaging bags, which comprises providing an easily peelable sealing process.

In the bag making and filling method of the above packaging bag,
(1) In the perforated processing step, forming the plurality of openings by irradiation with a pair of rotating rolls or lasers having a plurality of needle-shaped protrusions heated on at least one surface.
(2) The easily peelable seal portion is formed by a pair of heat seal rolls having one surface made of a metal material and the other surface made of an elastic material softer than metal.
(3) A perforation pattern in which the position near the vertical seal portion of the easily peelable seal portion is heat-sealed in the longitudinal direction along the easily peelable seal portion in a subsequent stage after the folding portion forming step. Providing a sealing process,
(4) Performing the perforated sealing step at the same time as forming the vertical sealing portion by a pair of heat sealing rolls in the vertical sealing step.
Is a more preferred solution.

The packaging bag of the present invention is composed of a packaging bag main body made of a plastic film for packaging and a bottom wall, and the packaging bag main body is a liquid material on the upper part by an easily peelable seal portion provided extending in the width direction thereof. It is divided into a storage space and a lower pouring space, and a plurality of openings are provided in the central portion of the bottom wall.

Therefore, according to this packaging bag, the easy-to-peel seal portion suppresses the entry of the liquid material filled in the storage space of the packaging bag body into the pouring space, so that a hole is opened in the bottom wall. While the liquid material does not leak even if it is provided, when the storage space is pressed with a finger toward the pouring space side at the start of use, the pressure of the pressurized liquid material causes the easily peelable seal portion to be released. After peeling off, the liquid material in the storage space enters the pouring space and is discharged from the plurality of openings provided in the bottom wall. At this time, the bottom wall is greatly expanded by the pressurized liquid material, and the central portion of the bottom wall is flattened. Therefore, the openings are made from a plurality of holes provided at the flattened portion. The liquids are stably discharged over a wide range like a shower without interfering with each other. In particular, when the bottom wall is formed by a bifurcated folding portion, the folding portion greatly expands to 180 ° or more due to the pressure of the liquid material, so that interference between multiple openings is further suppressed. Can be done.

Further, according to the present invention, the diameter of the opening is set in the range of 0.3 to 2.0 mm, and the diameter is preferably determined according to the type and properties of the liquid material to make the liquid material in the packaging bag. It can be discharged over a wide range like a shower from each opening.

Further, according to the present invention, by providing the perforated seal portion in the storage space at a position separated from the easily peelable seal portion, a load may be unexpectedly applied to the packaging bag during transportation or the like. However, the perforated seal portion relieves the pressure of the object to be packaged toward the easily peelable seal portion, and it is possible to prevent the easily peelable seal portion from being unexpectedly peeled off.

This is because the peeling of the easily peelable seal portion is the expansion angle (hereinafter referred to as "seal edge angle") formed between two overlapping plastic films for packaging at the side edge of the easily peelable seal portion. This is because the influence is large and the larger the seal edge angle is, the easier it is to peel off. In the present invention, by providing the perforated seal portion as described above, the seal edge at the side edge of the easily peelable seal portion is provided. The increase in the angle is suppressed, and the erroneous peeling of the easily peelable seal portion can be effectively prevented.

Here, in the present invention, the perforated seal portion is provided at a position where the seal edge angle is 180 ° or less, preferably 30 to 120 °, and / or the perforated seal portion and the easy peeling. It is preferable that the distance between the side edge edges of the seal portion on the side adjacent to each other is in the range of 1 to 5 mm, whereby erroneous peeling of the easily peelable seal portion can be prevented more effectively.

Further, when the gap formed between the seal portions of the perforated seal portion is 1 to 50 mm, preferably 3 to 25 mm, the resistance when the liquid material passes through the gap becomes appropriate. While the liquid material smoothly passes through the gap without backflow, at the start of use, the liquid material passes through a plurality of narrow gaps and is vigorously sprayed toward the easily peelable seal portion. Therefore, the easily peelable seal portion can be peeled off with a small pressing force.

Further, according to the bag-making and filling method of the packaging bag of the present invention, the packaging bag including the packaging bag main body and the bottom wall can be manufactured by one packaging plastic film, so that the number of parts is reduced. It is possible to continuously form a hole in the bottom wall (perforated processing step) and form the easily peelable seal portion (easy peel seal step) in the filling and packaging step. Because it can be made, it has excellent manufacturing efficiency.

Further, in the present invention, when the packaging plastic film at the position serving as the bottom wall is melted by a plurality of heated needle-shaped protrusions provided on the pair of rotating rolls to form the openings. The edge of the opening becomes hard and thick, the discharge direction of the liquid material is improved, and the opening is not torn by the discharge pressure of the liquid material, and the liquid material is stably showered to the end. Can be discharged to. Further, when the openings are formed by laser irradiation, a plurality of openings can be accurately formed at predetermined positions and pitches, and the control thereof is easy.

Further, in the present invention, the easily peelable seal portion is formed by a pair of heat seal rolls having one surface made of a metal material and the other surface made of an elastic material softer than metal, thereby forming a plastic film for packaging. The pinching force (pushing pressure) can be reduced, and the easily peelable seal portion can be easily and stably formed by adjusting the clearance and temperature between the heat seal rolls.

It is a perspective view which shows one Embodiment of the packaging bag of this invention. It is a partial perspective view which shows the state which the packaging bag of FIG. 1 was seen from the bottom wall side. It is a perspective view which shows the use state of the packaging bag of this embodiment. It is a perspective view which shows the other embodiment of the packaging bag of this invention. It is an end view at the position II-II of FIG. It is a schematic front view which shows an example of the automatic filling bag making machine for making a bag of the present invention. It is a partial enlarged view which shows another example of the automatic filling bag making machine for making a bag of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of a packaging bag according to the present invention, wherein a single packaging plastic film including at least a base film layer and a sealant layer is provided on the inner surface side of each other. Fold it in half in the width direction so that the folded portion 25 is formed by pushing the central portion of the folded base end portion 4 into the inside of the overlapping plastic films for packaging, and in that state, the overlapping edges on three sides are separated from each other. It consists of a packaging bag body 2 and a bifurcated fold-out portion 25 by sealing as shown by diagonal lines in the figure by heat seal, impulse seal, high frequency welder seal or ultrasonic seal, or other known sealing method. The packaging bag 1 is composed of the bottom wall 3.

The base film layer is composed of a uniaxially or biaxially stretched ethylene vinyl alcohol copolymer, a synthetic resin film such as polyolefin (polyethylene, polypropylene, etc.), polyester, polyamide, polyimide, polypropylene, vinylidene chloride, etc. Is preferable, and paper or non-woven fabric can also be used. Further, as the sealant layer, a polyolefin, an ethylene vinyl acetate copolymer, an ethylene ethyl acrylate copolymer, an ethylene acrylic acid copolymer, an ethylene methacrylic acid copolymer, an ethylene methyl methacrylic acid copolymer, an ionomer, or the like is used. Is preferable.

Further, an intermediate layer may be provided between the base film layer and the sealant layer depending on the properties required for the packaging bag 1, and the intermediate layer may be, for example, an aluminum foil, an alloy foil, or an ethylene vinyl alcohol co-weight. By using various coating layers such as coalescence, vinylidene chloride coating layer, aluminum oxide coating layer, vapor deposition layer such as Al vapor deposition layer and SiO ₂ vapor deposition layer, or sputtering layer such as SiO ₂ , Al, Al ₂ O ₃ , etc. It is possible to improve impermeableness, gas barrier property, waistiness and the like.

In the present embodiment, the packaging bag main body 2 and the bottom wall 3 are formed of one piece of plastic film for packaging, but the packaging bag main body 2 and the bottom wall 3 may be formed separately.

The packaging bag main body 2 has an upper liquid material accommodating space 2a and a lower pouring space 2b by an easily peelable seal portion 5 provided at a position above the folded base end portion 4 extending in the width direction thereof. The liquid material is held in the storage space 2a until the start of use, and the easy-release seal portion 5 prevents the liquid material from entering the pouring space 2b.

As shown in FIG. 2, the bottom wall 3 is provided with a plurality of (three in FIG. 2) openings 6 in the central portion. The holes 6 are provided at predetermined positions of the plastic film for packaging prior to the bag making of the packaging bag 1, and are continuously fed out in the filling and packaging by the filling and packaging machine as described later. It can also be formed by perforating a plastic film for packaging.

As described above, since the liquid material in the accommodation space 2a does not enter the pouring space 2b until the start of use, there is no risk of the liquid material leaking from the opening 6, but in the start of use, the figure. When the accommodating space 2a is pressed by a finger in the direction indicated by the arrow to 1, the easily peelable seal portion 5 is exfoliated by the pressure of the liquid substance in the pressurized accommodating space 2a, and the liquid substance enters the pouring space 2b. As shown in FIG. 3, the folded portion 25 (bottom wall 3) folded in a bifurcated shape is opened wide by the liquid substance that has entered, and the liquid substance is discharged from the three openings 6 in a shower shape. Will be done.

Since the openings 6 are provided in the central portion of the bottom wall 3, that is, the portion flattened by the expansion of the folded portion 25 due to the pressure of the liquid material, the plurality of openings 6 do not interfere with each other. The liquid material is stably discharged from each opening 6 in a shower shape, and the liquid material can be discharged over a wide range by one operation.

In particular, the opening 6 is preferably provided in the vicinity of the center position in the length direction of the bottom wall 3 (position of the folded base end portion 4), preferably at a position 1 to 5 mm away from the folded base end portion 4. According to this, the opening 6 is not affected by the folded base end portion 4 (folded line), and there is no possibility that the liquid matter is scattered due to the strain of the opening 6.

The number of holes 6 provided in the bottom wall 3 is appropriately determined depending on the type and properties of the liquid material, the intended use, the size of the packaging bag 1, and the like. The diameter of the opening 6 is preferably in the range of 0.3 to 2.0 mm and is preferably determined according to the type and properties of the liquid material. For example, when the liquid material is a highly viscous honey or a thick sauce. Set it to 0.6 to 2.0 mm, and in the case of oily substances such as mayonnaise or thick and easy-to-discharge liquid substances, set it to 0.3 to 0.9 mm to make the liquid substances shower-like from each opening. Can be discharged over a wide range.

The seal strength of the easily peelable seal portion 5 is such that the seal strength can be peeled off by the pressure of the liquid material by pressing the accommodation space 2a with a finger, preferably 2 to 20 N / 15 mm width, and more preferably 5 to 15 N / 15 mm width. And. The seal width of the easily peelable seal portion 5 is not particularly limited, but it is set to 1 mm or more, preferably 3 to 10 mm, when the storage space 2a is pressed with a finger to peel it off. Is easy to adjust.

FIG. 4 shows another embodiment of the packaging bag according to the present invention, in which a perforated seal portion 7 is provided along the easily peelable seal portion 5 in the accommodation space 2a. In FIG. 4, the perforated seal portion 7 is provided in parallel with the easily peelable seal portion 5, but if the perforated seal portion 7 is formed along the easily peelable seal portion 5. Often, for example, it may be provided so as to be inclined diagonally with respect to the easily peelable seal portion 5.

By providing the perforated seal portion 7, even if the accommodating space 2a is unexpectedly pressured during transportation or handling, the pressure of the liquid material toward the easily peelable seal portion 5 is the perforated seal portion 7. Since it is alleviated by passing through, high pressure is not directly applied to the easily peelable seal portion 5, and the effect of preventing erroneous peeling of the easily peelable seal portion 5 can be expected.

The perforated seal portion 7 is preferably formed so that the length d of the gap 8 formed between the seal portions 7a shown in FIG. 4 is 1 to 50 mm, preferably 3 to 25 mm. As a result, when the accommodation space 2 is pressed by a finger, the resistance when the liquid material moves through the gap 8 to the easily peelable seal portion 5 can be made appropriate, and the seal portion 7a is the liquid material. Does not peel off due to pressure. On the other hand, at the start of use, the liquid material is sprayed so as to smoothly pass through the plurality of gaps 8 and diffuse by pressing the accommodation space 2a with a finger, so that the seal strength of the easily peelable seal portion 5 is erroneous. Even if the packaging bag 1 does not have the perforated sealing portion 7 shown in FIG. 1 in order to suppress peeling, the package can be opened by pressing with a finger.

Further, it is preferable that the perforated seal portion 7 is provided at a position where the distance L (distance between adjacent side edge edges) from the easily peelable seal portion 5 is 1 to 5 mm. This is because if the distance L is less than 1 mm, the pressure of the liquid material cannot be sufficiently relaxed in the perforated seal portion 7, and the liquid material may head toward the easily peelable seal portion 5 with a high pressure. If it exceeds 5 mm, the effect of spraying due to the liquid material passing through the gap 8 of the perforated seal portion 7 cannot be obtained.

Further, the peeling of the easily peelable seal portion 5 is performed by expanding and expanding the two overlapping plastic films 9 for packaging at the side edge of the easily peelable seal portion 5 as shown in the cross-sectional view (FIG. 5) in II-II of FIG. The influence of the angle (seal edge angle θ) is large, and the larger the seal edge angle θ, the easier it is to peel off. Against this, by providing the perforated sealing portion 7 as described above, the degree of freedom in the opening direction (bulging direction) of the two plastic films 9 is reduced, and the sealing edge angle θ is increased. Since it is suppressed, it is possible to prevent the easily peelable seal portion 5 from being unexpectedly peeled off during handling or the like.

Therefore, when the perforated sealing portion 7 presses the accommodating space 2a with a finger and applies the pressure of the liquid substance to the pouring space 2b side, the sealing edge angle θ is 180 ° or less, preferably 30 to 120 °. It is preferable to provide the seal portion in the range of the above, and in this case, it is possible to effectively prevent the easy peeling seal portion 5 from being peeled off unexpectedly.

Next, a bag-making and filling method for the packaging bag 1 of the present invention will be described. FIG. 6 is a schematic view showing an embodiment of a filling and packaging machine for manufacturing the packaging bag 1 of the present invention.
The bag-making filling method of the present invention is mainly (1) perforated processing step, (2) folding portion forming step, (3) vertical sealing step, (4) easy peeling sealing step, (5) filling step, (6). ) It consists of a horizontal sealing process and (7) cutting process, and each process will be described below.

(1) Perforated processing step In this step, a pair of rotating plastic films 9 for packaging, which are continuously unwound from the raw roll R toward the top roll 10, are provided with needle-shaped protrusions on at least one surface. It is sandwiched by a roll 11 and a hole 6 is continuously or intermittently formed in the central portion in the width direction of the packaging plastic film 9 by piercing the protrusion or melting by heating. In the present embodiment, the opening 6 is formed by a pair of rotating rolls 11, but the present invention is not limited to this, and the opening 6 may be formed by laser processing. In this case, the position of the rotating roll 11 is irradiated with a laser. Install the device.
It should be noted that this perforated processing step may be located before the folding portion forming step described later, and for example, the plastic film 9 for packaging may be continuously or intermittently positioned at a predetermined position prior to filling and packaging by a filling and packaging machine. It is also possible to form an opening 6 and set the packaging plastic film 9 as a raw roll R in a filling and packaging machine.

The opening 6 is preferably formed by melting a heated protrusion by piercing the plastic film 9 for packaging. In this case, the edge of the opening 6 is hard and thick, so that the packaging 6 is packaged. The discharge direction when pouring the liquid material from the bag 1 is improved, and the opening 6 is not torn by the discharge pressure of the liquid material, and the liquid material is stably discharged in a shower shape until the end. be able to.
Further, the pitch of the holes 6 is controlled by the cash register mark provided on the packaging plastic film 9 according to the feeding speed of the packaging plastic film 9 and the length of the packaging bag 1.

(2) Folded portion forming step In this step, the packaging plastic film 9 unwound from the top roll 10 is continuously run from above to below, and is guided by the guide rod 12 during the run. After half-folding in the width direction, the folded base end portion 4, that is, the formed portion of the opening 6 of the half-folded packaging plastic film 9 is directed inward in the width direction by using the film folding jig 13. To form a bifurcated folding portion 25. As a result, the opening 6 is located inside the bifurcated folding portion 25.

The guide rod 12 and the film folding jig 13 are arranged at positions facing each other with the packaging plastic film 9 interposed therebetween, and the folding jig 13 advances with respect to the traveling plastic film 9 for packaging. By advancing between the two guide rods 12, the folded-back base end portion 4 is folded inward by the folding jig 13 to form a bifurcated folding portion 25.

(3) Vertical Sealing Step In this step, the longitudinal side edges 14 of the packaging plastic films 9 overlapped when the packaging plastic films 9 are half-folded are connected to each other by a pair of vertical sealing rolls 15 in the longitudinal direction (vertical). The vertical sealing portion 16 is formed by heat-sealing in the direction), and the packaging plastic film 9 is made into a tubular body 9'.

(4) Easy peeling seal step In this step, one surface of the tubular body 9'is located near the bifurcated folding portion 25 (closer to the vertical sealing portion 16), and the other surface is a lining rubber layer. A pair of easily peelable seal rolls 17 made of an elastic material such as the above are continuously heat-sealed in the longitudinal direction (longitudinal direction) to form the easily peelable seal portion 5.

Since one surface of the pair of easily peelable seal rolls 17 is made of an elastic material softer than metal, the pressing force between the pair of easily peelable seal rolls 17 is set to an extremely low pressure (about 0 to 15 MPa). Therefore, by adjusting the temperature of the easily peelable seal roll 17 and the clearance between the pair of seal rolls 17, the easy peeling seal portion 5 can be stably formed while adjusting the easy peeling strength. can.

Each of the pair of easily peelable seal rolls 17 has one annular flange on the outer peripheral surface thereof and a heater (not shown) for heating the annular flange inside thereof, but one surface of the easily peelable seal roll 17 is made of a rubber material. In the case of the above, the thermal conductivity is small, so that the temperature difference between the inside and the outer surface of the easily peelable seal roll 17 becomes large. Therefore, it is preferable that the heater temperature of the easily peelable seal roll 17 is adjusted based on the measured value by measuring the temperature of the surface of the roll 17 using a radiation thermometer, an infrared camera, or the like. The elastic materials include rubber materials such as silicon rubber, fluororubber, ethylene propylene rubber, hypolon rubber, and nitrile butadiene rubber, and metal materials having an elastic coefficient such as polytetrafluoroethylene, epoxy resin, phenol resin, polyamide, and polyester. It may be lower than that, and preferably has a hardness of 70 to 90 degrees and a thickness of 1.0 to 5.0 mm.

When the surface of either one of the pair of easy-release seal rolls 17 is made of a metal material, the surface of the easy-release seal roll 17 made of a metal material is polished or blasted to have a diameter of 0.2 to 0.8 mm. It is preferable to make a certain degree of hole processing to reduce the contact area with the packaging film F. According to this, the pressing force and heat transfer from the easily peelable seal roll 17 are weakened, and the easily peelable seal portion 5 is used. It becomes easy to adjust the temperature, pressing force, etc. when forming the metal.

(5) Filling Step In this step, the liquid material is continuously filled inside the tubular body 9'using the filling nozzle 18 as shown in FIG. 6, for example. Since the easily peelable seal portion 5 is formed on the tubular body 9', the filled liquid material is blocked by the easily peelable seal portion 5 and does not enter the folded portion 25, and is folded back. It is possible to prevent the leakage of the liquid substance from the opening 6 provided in the base end portion 4.

(6) Horizontal Sealing Step In this step, the tubular body 9'is heat-sealed over the entire width with a pair of horizontal sealing rolls 19 at regular intervals (length intervals of the packaging bag 1) to form the horizontal sealing portion 20. By forming, the packaging bag 1 is continuously formed. The horizontal seal portion 20 is formed by heat-sealing the liquid material filled from the filling nozzle 18 with a pair of horizontal seal rolls 19 and heat-sealing the squeezed position (filling the seal in the liquid). No liquid matter is caught in the portion 20.

As shown in the figure, a pair of cooling rolls 21 for sandwiching the horizontal seal portion 20 and ensuring sealing of the horizontal seal portion 20 are appropriately provided at the subsequent stage of the horizontal seal step.

(7) Cutting Step In this step, the entire width of the horizontal seal portion 20 is cut for each bag or for each required plurality of bags by using, for example, a rotary type cutting means 22.

In the present invention, between the (2) folding portion forming step and the (5) filling step, the easy peeling seal portion 5 is located near the easy peeling seal portion 5 (on the vertical seal portion 16 side) along the easy peeling seal portion 5. As described above, a perforated sealing step for forming the perforated sealing portion 7 may be appropriately provided. As shown in the partially enlarged view of FIG. 7, the perforated seal portion 7 has a seal blade 23 having perforated irregularities on at least one surface between the vertical seal roll 15 and the easily peelable seal roll 17. In addition to newly providing and forming a pair of perforated seal rolls 24, a perforated seal blade is provided on the vertical seal roll 15, and the vertical seal portion 16 and the perforated seal portion 7 are simultaneously provided. It may be formed.

1 Packaging bag 2 Packaging bag body 2a Storage space 2b Injection space 3 Bottom wall 4 Folded base end 5 Easy peeling seal 6 Opening 7 Perforated seal 7a Seal 8 Gap 9 Plastic film for packaging 9'Cylindrical Body 10 Top roll 11 Rotating roll 12 Guide rod 13 Folding jig 14 Side edge 15 Vertical seal roll 16 Vertical seal 17 Easy peeling seal roll 18 Filling nozzle 19 Horizontal seal roll 20 Horizontal seal 21 Cooling roll 22 Cutting means 23 Seal Blade 24 Perforated seal roll 25 Folded part

Claims (12)

A packaging bag for filling a liquid substance , which comprises a packaging bag body made of a packaging plastic film and a bottom wall of the packaging plastic film provided at the lower end of the packaging bag body.
The packaging bag body extends in the width direction of the packaging bag body, and has an upper liquid material storage space by an easily peelable seal portion formed by mutual fusion of two overlapping plastic films for packaging. It is divided into a pouring space at the bottom and
The bottom wall is located at the lower end of the pouring space and has a plurality of openings in the center thereof for discharging the liquid material filled in the storage space.
The packaging bag main body and the bottom wall are composed of a single packaging plastic film folded in the width direction, and the bottom wall has a width at the center of a folded base end portion of the one packaging plastic film. A packaging bag characterized by having a bifurcated fold formed by pushing inward in the direction . The packaging bag according to claim 1 , wherein the opening is provided at a position near the center in the length direction of the bottom wall. The packaging bag according to claim 1 or 2 , wherein the opening has a diameter of 0.3 mm to 2.0 mm. The item according to any one of claims 1 to 3 , wherein the accommodation space has a perforated seal portion extending along the easily peelable seal portion at a position separated from the easily peelable seal portion. Packaging bag. The packaging bag according to claim 4 , wherein the distance between the side edge edges of the perforated seal portion and the easily peelable seal portion on adjacent sides to each other is 1 mm to 5 mm. The perforated seal portion is formed between the two overlapping plastic films at the side edge when the pressure of the liquid material is applied to the side edge of the easily peelable seal portion by pressing the accommodation space. The packaging bag according to claim 4 or 5 , wherein the packaging bag is provided at a position where the angle is 180 ° or less. The packaging bag according to any one of claims 4 to 6, wherein the perforated seal portion has a gap formed between the seal portions of 1 to 50 mm. The plastic film for packaging that is continuously fed is folded back in the width direction to overlap the side edges, and the central portion of the folded base end portion is pushed inward in the width direction to form a bifurcated folded portion. Folded part forming process and
After the folding portion is formed, the side edges of the laminated plastic films for packaging are heat-sealed in the longitudinal direction to form a vertical sealing portion, and a vertical sealing step of forming a tubular body.
A horizontal sealing step of forming a lower horizontal sealing portion as a bottom and then forming an upper horizontal sealing portion as a top by heat-sealing over the entire width of the tubular body.
A filling step of filling the tubular body with an object to be packaged while the upper horizontal seal portion is formed after the lower horizontal seal portion is formed.
In the bag making and filling method of the packaging bag including the cutting step of cutting the packaging bag made by each step into one bag or each of a plurality of bags.
Prior to the folding portion forming step, a perforated processing step for continuously or intermittently forming a plurality of openings is provided at the center portion in the width direction of the packaging plastic film.
Prior to the filling step, the position near the vertical seal portion of the folded portion is continuously heat-sealed in the longitudinal direction with a joint strength weaker than that of the vertical seal portion to form an easily peelable seal portion. A method for making and filling a packaging bag, which comprises providing an easily peelable sealing process. 8. The perforated process is characterized in that the plurality of holes are formed by irradiation with a pair of rotating rolls or lasers having a plurality of needle-shaped protrusions heated on at least one surface. The method for making and filling the packaging bag described in 1. The easy-to-peel seal portion according to claim 8 or 9 , wherein one surface is made of a metal material and the other surface is made of a pair of heat seal rolls made of an elastic material softer than metal. How to make and fill packaging bags. After the folding portion forming step, a perforated sealing step of heat-sealing the vicinity position of the easily peelable sealing portion on the vertical sealing portion side in the longitudinal direction along the easily peeling sealing portion is performed. The method for making and filling a packaging bag according to any one of claims 8 to 10 , wherein the packaging bag is provided. The bag-making and filling method for a packaging bag according to claim 11 , wherein the perforated sealing step is performed at the same time as the formation of the vertical sealing portion by a pair of heat-sealing rolls in the vertical sealing step.

Images