JPH061358A - Packaging bag - Google Patents

Abstract

PURPOSE:To stabilize the small quantity-pouring out by a method wherein a packaging bag is formed of a multi-layer plastic film which has a heat- bondable plastic layer as the inner layer, and content guiding linear ribs consisting of adjacent linear ribs of which the cross sectional shapes are a recessed part and protruding part are provided on the inner surface in the vicinity of the discharge port, in the discharge flow direction. CONSTITUTION:A packaging bag is formed using a multi-layer plastic film which has a heat-bondable plastic layer, e.g. polyethylene layer, as the inner layer. That is, content guiding linear ribs 21 consisting of a linear raised part 24 and linear groove 25 are formed by a press-die 4 on the multi-layer plastic film 2 to form a raw material film for packaging bag. The raw material film with the linear ribs 21 is sealed along side seal lines 41 to form a bag. At the time, the linear ribs 21 are arranged to lie in the pouring out direction or air introducing direction at the pouring port or air introducing passage (it is formed by being cut along EE', BB').

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag in which the contents can be easily poured from the outlet of the packaging bag filled with the contents and the outlet of the packaging bag can be made rigid. is there.

[0002]

2. Description of the Related Art In recent years, a large amount of plastic film packaging bags have been used for packaging powders and liquids in small portions. As this type of packaging bag, a pillow bag attached with a palm, a three-sided sealed three-sided sealed bag, a two-sided sealed bag, or a self-supporting bag having a circular or square bottom surface is generally used. These packaging bags filled with contents usually have their filling ports sealed to prevent the contents from leaking. In order to take out the contents filled in these packaging bags from the packaging bag, it is common practice to cut out a portion of the packaging bag that serves as a discharge port and pour out the contents from the cutout portion. By the way, when the contents are poured out from the packaging bag, the plastic film in the vicinity of the discharge port may be in close contact with the contents, and the contents may be difficult to come out. In this case, the contents are forcibly poured out by squeezing the bag with a hand, but there is a drawback that it is difficult to pour out the contents little by little because the contents suddenly pop out. In addition, since the strength of the outlet is weak, the shape of the outlet is not constant, and the shape of the outlet changes during pouring, which makes it difficult to pour the appropriate amount of the contents little by little. It was Conventionally, in order to pour out the contents little by little from the packaging bag, the shape of the outlet of the packaging bag is made into an S shape and the periphery is sealed, and when the bag is not pressed, the film of the bag is stuck and the contents leak. There has been proposed a packaging bag in which the contents are discharged from the S-shaped discharge port when the bag is not pressed and the bag is pressed. However, even in the case of this packaging bag, it is difficult to adjust the force pressing the bag, and it is difficult to pour out the contents little by little.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of conventional packaging bags, and an object thereof is to provide a packaging bag in which the contents can be poured little by little and the discharge port has an increased rigidity. It was made.

[0004]

Means for Solving the Problems As a result of intensive studies to develop the above-mentioned packaging bag, the present inventor has found that the vicinity of the outlet of a packaging bag made of a multilayer plastic film having a heat-adhesive resin layer on the inner surface layer. By providing a linear rib whose cross-sectional shape is a shape in which a concave portion and a convex portion are adjacent to each other on at least one of the inner surfaces of the container along the flow direction for discharging the contents, a discharge passage for the contents can be secured, and It was found that the contents can be easily poured out little by little from the packaging bag, and the present invention has been completed based on this finding. That is, the present invention is a packaging bag made of a multi-layer plastic film, wherein the multi-layer plastic film has a heat-adhesive plastic layer as an inner layer, and the inner surface of the discharge port has a cross-sectional shape in which a concave portion and a convex portion are adjacent to each other. The present invention provides a packaging bag characterized in that a content-guiding linear rib made of a certain linear rib is provided along the discharge flow direction of the content.

The present invention will be examined in detail below. The packaging bag of the present invention comprises a multi-layer plastic film, and the multi-layer plastic film has an inner layer having a heat-adhesive plastic layer. The multi-layer plastic film is not particularly limited as long as it has a heat-adhesive plastic layer as an inner layer, and various ones can be used. As the material of the thermoadhesive plastic layer of the inner layer, various plastics can be used, for example, polyolefins such as polyethylene and polypropylene, chlorine-containing polyolefins such as polyvinyl chloride, aromatic vinyl polymers such as polystyrene, polyurethane, Polyester such as polyethylene terephthalate, polyamide such as nylon, polycarbonate, polyarylate, polyether, ethylene-
Examples thereof include vinyl acetate copolymers, copolymers of ethylene-copolymerizable monomers such as ethylene-acrylic acid copolymers, and ionomers, but these substances may be used alone. You may use it in combination of 2 or more types. If the bag is a self-supporting bag and the body member and the bottom member of the bag are different, the inner plastic layers may be the same kind of plastic or different plastics, The same kind is preferable because it is easily adhered. The inner plastic layer may be a single layer or a multi-layer structure having two or more layers.

As the multi-layer plastic film, a laminated film in which a film made of the above-mentioned plastics and other various plastics is laminated on a thermo-adhesive plastic layer as an inner layer can be used, but a multi-layer plastic in which plastic films having different melting points are laminated. Film is preferred. The multi-layer plastic film with different melting points has a high melting point because the plastic film with a high melting point does not melt when a linear protrusion is pressed against the plastic film with a low melting point at a temperature close to the melting point of the low melting point plastic film. The linear groove can be formed only in the plastic film layer having a low melting point. It is preferable to use a multi-layered plastic film having different melting points because it is difficult to cut the plastic film even when the linear protrusions are pressed too much. In the case of a multi-layer plastic film with three or more layers, if a plastic film with a lower melting point is laminated on the inner layer and outer layer than the intermediate layer, linear projections are pressed simultaneously from both sides, and at the same time linear grooves and swells are formed. Parts can be formed.

The difference in melting point is not particularly limited, but a difference of 10 ° C. or more is preferable, and 20 ° C. is particularly preferable.
Those having the above difference are preferable, and those having the difference of 30 ° C. or more are more preferable. Examples of the plastic film having a low melting point include polyolefin films such as polyethylene and polypropylene, and examples of the plastic film having a high melting point include stretched nylon 6
-6, engineering plastic films such as stretched polyethylene terephthalate, and the like. Also, in order to impart barrier properties to the multilayer plastic film, use an aluminum foil, a saponified copolymer of ethylene and vinyl acetate (EVOH), or a plastic film using vinylidene chloride as the intermediate layer. You can Further, as the multi-layer plastic film, a flexible laminated film in which a film made of a material other than plastic such as aluminum or paper is laminated on the inner heat-adhesive plastic layer can be used. further,
It is also possible to use a printed multi-layer plastic film.

The thickness of the multilayer plastic film is not particularly limited, but is usually 10 μm to 1000 μm.
m, preferably 30 μm to 500 μm
And particularly preferably 30 μm to 300 μm.
The thickness of the thermoadhesive plastic layer as the inner layer is not particularly limited and is preferably 20 to 300 μm, particularly preferably 50 to 250 μm. In the packaging bag of the present invention, it is necessary to provide a linear rib for guiding the contents, which is a linear rib having a cross-sectional shape in which a concave portion and a convex portion are adjacent to each other, on the inner surface near the outlet. The linear rib provided on the packaging bag of the present invention may have a shape in which a linear groove having a concave sectional shape and a linear projecting portion having a convex sectional shape are adjacent to each other, but in particular, two linear protruding portions are provided. A structure having one linear groove between the portions is preferable.

The width of the linear groove having a concave cross section is usually 100 to 5000 μm, preferably 500 to 30.
It is 00 μm. Further, the depth of the linear groove is preferably within the thickness range of the inner layer of the multilayer plastic film, but the linear groove can be formed beyond the thickness of the heat-adhesive plastic layer as the inner layer. The height and width of the linear protrusion of the formed linear rib may be appropriately selected and determined according to the required rigidity, but the height of the protrusion is usually 20 to 500 μm.
m, and preferably 50 to 300 μm. In addition,
Here, the height of the protrusion means the height from the surface of the portion of the surface of the plastic film having the linear ribs where the linear ribs are not applied to the apex of the protrusion.

In order to efficiently bring out the effect of the content-guiding linear ribs, it is necessary that the linear ribs be provided along the discharge flow direction of the contents. The content guiding linear rib may be provided along the discharge direction of the content, and the shape thereof may be linear or curved.
Further, the number of the content guide linear ribs may be appropriately selected according to the required performance, and one may be provided on one side of the inner surface near the discharge port or two or more, but preferably 2 to It is five. When there are two or more linear ribs, they may be separated from each other or may be connected to each other. The length of the linear rib for guiding the contents may be any length as long as it can secure the passage for discharging the contents, and may be appropriately selected depending on the size of the bag, the size and shape of the outlet, and the like. Good. The content guiding linear rib of the present invention may be applied to only one of the inner surfaces near the discharge port, but is preferably applied to both surfaces, and particularly preferably symmetrically applied to both surfaces.

The content guiding linear rib of the present invention can secure at least one content discharge passage and also an air introduction passage into the bag. By introducing air into the bag when discharging the contents, the contents can be easily discharged. For example, if one linear rib for guiding contents is provided on the inner surface of the outlet of the bag, one passage is secured above and below the linear rib for guiding contents. At least one of the two passages can function as a content discharge passage, and the other passages can function as air introduction passages. Further, in the packaging bag of the present invention, a linear rib having the same shape as the linear rib for guiding the contents may be provided as a linear rib for introducing air at a position other than the vicinity of the outlet of the bag. And, when the linear ribs for guiding the contents and the linear ribs for introducing air are connected,
The effect of the present invention can be further enhanced. The number of linear ribs for introducing air may be appropriately selected according to the shape and size of the bag.

Further, the lower end of the linear rib may be extended to the vicinity of the bag bottom along a side line of the bag such as a side seal line. The position where the lower portion of the linear rib extending along the side seal line is provided is preferably 15 to 40% inward from the side seal line, particularly 20 to 3
Positions 0% apart are preferred. The shape of the portion extending to the lower end of the linear rib is preferably a straight line or a curved line, and particularly preferably a straight line. Furthermore, the linear rib for guiding contents of the present invention reduces the thickness of the plastic film portion on which the linear protrusion is pressed by pressing a pressing die having a linear protrusion at the tip against the plastic film. It is preferable that a linear rib is provided by forming a linear groove, forming a raised portion on the upper end of the groove, and fixing the raised portion. The packaging bag of the present invention is not limited as long as it is a packaging bag made of a multi-layered plastic film, and may be, for example, a flat bag, a self-supporting bag such as a doypack shape or a gusset shape, and the width of the bottom and the top of the bag. However, various shapes can be applied, such as the same shape, or the width of the bottom of the bag is narrower at the top.

Next, an example of a method of manufacturing the packaging bag with linear ribs for guiding contents of the present invention will be described. In the method for producing a packaging bag with linear ribs for guiding contents of the present invention, a pressing die having a linear protrusion at its tip is pressed against a multilayer plastic film having a heat-adhesive plastic layer as a surface layer, The thickness of the multi-layer plastic film part where the linear protrusions are pressed is reduced to form a linear groove, and a raised portion is formed at the upper end of the groove, and the raised portion is fixed to form a multi-layered rib. The step (1) of providing the plastic film is performed.

In this step (1), it is necessary to press a pressing die having a linear protrusion at its tip against the multilayer plastic film. The multi-layer plastic film as the raw material in the step (1) may be a long multi-layer plastic film supplied from a single original roll, which is cut into two pieces in the longitudinal direction and supplied. The cutting in the longitudinal direction may be performed according to the shape of the bag to be manufactured, but it is preferable to perform the cutting in the longitudinal center line of the multilayer plastic film which is not usually cut because it is wasteless. When the multi-layer plastic film as the raw material is supplied to the step (1) in this way, the printing misalignment is caused by making the respective distances to the step (3) of the multi-layer plastic film cut into two sheets the same. It is preferable because it is easy to manufacture a bag that does not have a bag. In this case, the linear rib attachment in the step (1) may be performed on either one of the two multilayer plastic films, or on both of them.

The pressing die used in the step (1) has a linear protrusion at its tip. By pressing the linear projection on the multilayer plastic film, the thickness of the plastic film part on which the projection is pressed can be reduced to form a linear groove, and the linear projection can be raised at the upper end of the groove. Parts can be formed.
The height of the linear protrusions is required to be able to form at least a linear groove and not to interfere with the formation of a raised portion at the upper end of the groove, and is usually 0.3 mm or more, preferably 0.1 mm. It is 5 to 3 mm. The width of the linear protrusion is such that a linear groove can be formed, and is usually 0.5 to 5 m.
m, preferably 0.5 to 3 mm, particularly preferably 1 to 2 mm.

The cross-sectional shape of the linear protrusion in the width direction is generally from the tip of the protrusion toward the base of the protrusion so that the linear protrusion can be easily removed from the formed linear groove. They are of equal width or wide toward the base. The cross-sectional shape of the tip of the linear protrusion in the width direction can be various shapes such as a circular shape, a curved shape such as an arc, a linear shape, and a combined shape thereof. Further, the linear protrusion may have a single linear shape, a single curved shape, or a combination of two or more of these.
Further, the linear protrusions can be arranged in various ways. For example, one in which two or more linear projections are arranged in parallel close to each other, one in which the linear projections arranged in close proximity to each other are arranged with a space, and two or more linear projections are arranged. There are various arrangements such as an arrangement in which the intervals are widened and arranged in parallel, and an arrangement in which these shapes are combined.

The linear projection as described above may be pressed against the multilayer plastic film by various methods such as cold compression, ultrasonic oscillation during pressing, and heating and pressing, but heating and pressing are preferable. . When the multilayer plastic film is heated when the linear projection is pressed, it is preferably heated to a temperature not lower than the melting point of the inner plastic film when pressed to the multilayer plastic film. In particular, when the multi-layer plastic film is a multi-layer plastic film composed of a plastic film layer having a high melting point and an inner plastic film layer having a low melting point, the plastic having a low melting point when the linear protrusions are pressed against the plastic film layer having a low melting point. It is preferable to heat to a temperature not lower than the melting point of the film and not higher than the melting point of the plastic film having a high melting point. Further, the pressing time of the pressing die may be any time required for forming the raised portion, and it may be appropriately selected and determined, but from the viewpoint of manufacturing efficiency, it is preferably as short as possible. This time is usually 0.3 to 3 seconds, preferably 0.5 to
2 seconds.

By pressing the above linear protrusions,
Forming a linear groove, at least one side of the upper end of the groove,
Normally, the raised portions will be formed on both sides. The linear protrusion should not be pushed so far as the multilayer plastic film is cut, and the multilayer plastic film must be connected at the bottom of the groove, and the thickness of the bottom may be appropriately selected. However, it is preferable to form the groove so as not to cut the thermoadhesive plastic layer. In the step (1) of the present invention, the raised portion formed as described above is fixed.

The raised portion can be fixed by various methods, including forced cooling such as freezing, cooling type pressing or cooling with a cooling medium, and a concave portion for fitting the linear rib-shaped projection. Methods such as pressing of molds or a combination thereof may be mentioned, but forced cooling is preferable because the manufacturing efficiency of the ribbed multilayer plastic film is good. The forced cooling time may be appropriately selected depending on the type of the multilayer plastic film and the pressing conditions of the pressing die. By fixing the raised portion, it is possible to form linear ribs on the multilayer plastic film. In step (1), the multi-layer plastic film is placed on a flat mold, and a linear protrusion is pressed against the top of the multi-layer plastic film, and the film surface having no linear rib is left flat on the other surface. It is preferable because a linear rib can be attached.

It is preferable that the multi-layer plastic film is pressed against both sides of the pressing die having the linear projections on both the front surface and the back surface, since the linear ribs can be simultaneously provided on the two multi-layer plastic films. The linear ribs can be provided on the multilayer plastic film as described above, but in the present invention, the linear ribs may be provided on only one side of the multilayer plastic film or on both sides of the multilayer plastic film. good. A step of printing on the multi-layer plastic film may be provided before or after the step (1). In the method for producing a packaging bag with linear ribs for guiding contents according to the present invention, the multilayer plastic films with linear ribs obtained in the step (1) or the multilayer plastic film obtained in the step (1) and other The step (2) of stacking the plastic films so that the linear ribs are located near the outlet of the bag is performed.

In the step (2), the multi-layer plastic films which are laminated with the heat-adhesive plastic layer on the inner surface may be separate multi-layer plastic films, or may be folded and laminated into two sheets. It may be a multi-layer plastic film. At least one of the laminated multi-layer plastic films needs to be provided with the linear rib formed in the step (1), and both plastic films are provided with the linear rib. Is preferred. Also, step (2)
In step (2), before or after the step (2), there is provided a step of attaching a bottom-constituting multilayer plastic film forming the bottom of the bag to each end of the laminated or laminated linear ribbed multilayer plastic film, thereby providing self-supporting property. It can also be made into a bag. The method for stacking the multilayer plastic films may be appropriately selected according to the shape of the bag to be manufactured. For example, various methods such as a method of simply stacking two multilayer plastic films, a method of folding the ends into a W shape and stacking the same. Is applied.

In the self-supporting bag, as a method of stacking the multi-layer plastic films in the step (2), a self-supporting bag made of the multi-layer plastic film in which the linear ribs produced in the step (1) are arranged at predetermined positions. A heat-adhesive plastic so that the bottom component of a film for producing a self-supporting bag, which has a body component forming a body of a bag, can be formed into a substantially W shape when folded in a mountain fold in the longitudinal direction. It is preferable to stack the bottom forming portion and the barrel forming portion with the layers as the inner surface. In the method for producing a packaging bag with linear ribs for guiding contents according to the present invention, a step (3) of subjecting the multilayer plastic films stacked in the step (2) to heat sealing for forming the shape of the bag is performed.
The shape of the bag formed in this step (3) can be various bag shapes. The heat sealing in this step (3) is performed to form the bag, and the shape of the heat sealing may be appropriately selected according to the shape of the bag.

In the method for producing a packaging bag with linear ribs for guiding contents of the present invention, a step (4) of cutting the packaging bag from the multilayer plastic film obtained in the step (3) is performed. The bag cutting performed in this step (4) can be performed by various means such as a cutting blade and a fusing blade.
The cutting may be performed according to the shape of the bag formed on the multilayer plastic film, and various cutting shapes such as linear cutting, curved cutting, and punching may be performed.
The step (3) and the step (4) may be performed at the same time. When performing both steps at the same time, by performing heat sealing and fusing at the same time with a heat seal blade, a cutting blade or a fusing blade is provided along the heat seal blade, and the heat sealing blade and the fusing blade or fusing blade are simultaneously or It is preferable to press the cutting blade or the fusing blade against the multilayer plastic film for heat sealing and cutting a little later than the heat sealing blade.

In the method for producing a packaging bag with linear ribs for guiding contents according to the present invention, the steps (1), (2), (3) and (4) are continuously carried out to obtain a linear bag for guiding contents. It is preferable to continuously produce the ribbed packaging bag because the ribbed packaging bag can be efficiently produced. When continuously manufacturing a packaging bag with linear ribs for guiding contents, a long multi-layer plastic film is used as the multi-layer plastic film, and the long multi-layer plastic film is continuously or intermittently supplied to the rib forming device. It is preferred to feed in and continuously produce a linear ribbed multilayer plastic film. The feeding of the multilayer plastic film can be carried out by various methods, for example, by winding the winding roll continuously or intermittently.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings of the embodiments. The present invention is not limited to these examples. FIG. 1 is a schematic view of a device for forming a linear rib for guiding contents, which is provided in the packaging bag of the present invention. In FIG. 1, a long multi-layer plastic film 2 (structure: 140 μm polyethylene film and 15 μm polyethylene film)
A two-layer film in which m stretched nylon 6-6 film is laminated, thickness: 160 μm, width: 550 mm) has been sent from the multi-layer plastic film raw roll 1 to the pressing die 4 via the dancer roll 3 and the pressing thereof. In the mold part, the multi-layer plastic film 2 is a pedestal 18 made of a flat metal, with the oriented nylon 6-6 film surface facing down.
It is mounted on (planar type). The pressing die 4 in which two sets of two linear protrusions having a width of 600 μm and a length of 30 mm are arranged close to each other is moved down by the pressing die driving device 5 which can move the pressing die 4 up and down, and the multilayer plastic film is obtained. It is pressed against two polyethylene film layers. The linear protrusion having a substantially arc-shaped curved portion provided at the tip of the pressing die 4 is heated to 120 ° C., the plastic film has a groove depth of 130 μm, and a groove bottom thickness. Press the linear protrusions until it becomes 30 μm,
Hold for 1 second.

Then, the pressing tool 8 for moving the pressing tool 8 up and down lowers the pressing tool 8 to intermittently press the multilayer plastic film 2. After that, the pressing die 4 was pulled up by the pressing die driving device 5 and separated from the plastic film. When the pressing die 4 is pulled up, the pressing tool 8 and the cooling die 6 hold down the multilayer plastic film 2 so that the multilayer plastic film 2 cannot be pulled up together with the pressing die 4. This results in a groove width of 6
It was possible to form a linear groove having a depth of 00 μm and a groove depth of 130 μm and a linear raised portion having a height of 80 μm at both ends of the upper end of the groove. Next, the pressing tool 8 and the cooling die 6 are pulled up, the clamps 10 and 13 are driven by the clamp driving devices 11 and 14 to sandwich the multilayer plastic film 2 by the clamps 10, 12 and 13, 15 respectively, and these clamps are clamped. The pitch feed device horizontally moves one pitch along the clamp shaft 16 and feeds it to the next cooling device. After moving the multilayer plastic film 2 by one pitch, each clamp returns to its original position again.

In the cooling device, the cooling mold 6 is moved down by the cooling mold driving device 7 capable of moving the cooling mold 6 up and down, and is brought close to the multilayer plastic film 2. This cooling mold 6 blows air at 25 ° C. for 1.5 seconds on the surface of the multilayer plastic film 2. Then, the cooling die 6 is pulled up and the ribbed multi-layer plastic film 2 is wound on the winding roll 20. After starting to blow air with the cooling mold 6, the pressing mold 4 is lowered and pressed against the multilayer plastic film 2. Then, the plastic film with linear ribs for guiding the contents can be continuously manufactured by repeating the above-mentioned procedure sequentially. The tension of the sent plastic film 2 can be adjusted by a dancer roll. As a result, as shown in FIG. 2, it was possible to form the grooves only in the polyethylene film layer and provide the content-introducing linear ribs in the plastic film.

FIG. 3 is an enlarged cross-sectional view showing a state in which the linear protrusions 22 and 23 at the tip of the pressing die 4 are pressed against the multilayer plastic film 2 to form the linear groove 25 and the raised portion 24. It is a figure. The heat-insulating material 52 is coated on the surface of the pressing die 4 where the linear protrusions 22 and 23 are not provided, and the heat is transmitted from the linear protrusions 22 and 23 to the multilayer plastic film and the linear ribs are not applied. Makes it difficult to transfer heat. Thereby, the linear ribs can be efficiently provided. FIG. 4 is an enlarged cross-sectional view showing a state in which the groove 25 and the raised portion 24 are formed when the distance between the linear protrusions 22 and 23 of FIG. 3 is shortened. The width of the linear protrusions 22 and 23 at this time is 500 μm.
m, and the distance is 2000 μm. for that reason,
There are three raised portions 24.

FIG. 5 is a schematic view showing an apparatus for producing a self-supporting bag of the present invention. In the figure, the plastic film pulled out from the original roll is the multi-layer plastic film used in FIG. 1, and the linear groove and linear ribbing device (A part) shown in FIG. Can be ribbed. Next, the linear ribbed multi-layer plastic film is rotated 90 degrees by the direction changing guide 26, and then the center line in the longitudinal direction thereof is cut by a cutter 27 to divide it into two linear ribbed multi-layered plastic films. To be The two divided multi-layered plastic films with linear ribs are further rotated by 90 degrees by a roll 28, and then superposed by a roll 30 with the linear ribbed surface inside, and at both ends thereof, a bottom component is formed. The multi-layer plastic film 29 (the same film as the multi-layer plastic film of FIG. 1) 29 is folded in half and inserted. As a result, four multi-layered plastic films are laminated at both ends. The multilayer plastic film of the bottom forming portion is supplied from an original roll, which is not shown in the drawing, but located on the vertical side surface in FIG. Next, the laminated multi-layer plastic film is placed on the heat-seal receiving base 34, and the side and bottom of the bag are heat-sealed by the heat-sealing bar 32 to form the bag. Next, the heat-sealed multilayer plastic film was cooled by the cooling mold 35, and then cut into a bag shape by the punching blade 36 to manufacture the bag 37. The remaining multi-layer plastic film from which the bag 37 was punched was wound by a winding roll (not shown).

In FIG. 6, there is shown a plan view of the packaging bag in which three linear ribs for guiding contents are arranged at both ends of the upper portion of the packaging bag. The content guiding linear rib does not have to be provided at both ends as shown in FIG. 6, but may be provided only at one end. This packaging bag is 2 of the same width
180 pieces of up-and-down moving type, by stacking a plurality of multi-layer plastic films with long linear ribs (constitution: polypropylene film having a thickness of 100 μm and multi-layer plastic film of stretched nylon 6-6 film having a thickness of 15 μm, thickness: 120 μm) It can be manufactured by pressing a heat seal bar at ℃ and applying the side seal wire 41 which constitutes the side part of the packaging bag. Since the laminated multi-layer film has a polypropylene film having a low melting point on the inside, it can be easily fused by a heat seal bar at 180 ° C. This side seal line 41
Has a width of 5000 μm.

FIG. 7 shows a cross-sectional view of the upper end of the packaging bag of FIG. 6 taken along the line BB '. On the inner surface of the packaging bag, linear ribs for guiding the contents are symmetrically provided so as to face each other, and a passage for the contents is secured,
It also has rigidity. As a result, the contents can be poured out little by little from this outlet. The content guiding linear ribs need not be provided on both sides of the inner surface of the packaging bag as shown in FIG. 7, but may be provided on only one side. FIG. 8 shows another embodiment of the packaging bag of the present invention, which is an example in which the linear ribs 21 for guiding contents are extended not only near the discharge port but also over the entire packaging bag. In this example, two linear ribs 21 for guiding contents are arranged at both ends of the upper part, but one is connected between both ends, and the other one is to the lower end of the packaging bag. It is growing.

FIG. 9 shows a sectional view of the packaging bag of FIG. 8 taken along the line CC '. A passage for contents is secured as in FIG. 7. In addition, here, the outlet B
If the linear ribs on the opposite side of B'and CC 'are cut out in the EE' direction, they become air inlets into the packaging bag and prevent depressurization inside the packaging bag. Can be granted. FIG. 10 shows another embodiment of the packaging bag of the present invention, which is an example in which the packaging bag of FIG. 8 is further provided with another linear rib 21 for guiding contents. FIG. 11 shows an example of a packaging bag in which the outlet of the contents is S-shaped, and linear ribs for guiding the contents are provided on both inner surfaces of the tip of the outlet. Then, FIG. 12 shows a cross-sectional view of the packaging bag of FIG. 11 taken in the DD ′ direction. Thereby, the contents can be poured out little by little.

[0033]

According to the packaging bag of the present invention, since the linear rib for guiding the contents is provided in the vicinity of the discharge port, the discharge passage for the contents is secured, and when the contents are discharged. It does not pop out all at once and can be poured out in small amounts. Moreover, since the linear rib for guiding the contents provides rigidity in the vicinity of the discharge port, the contents can be poured out little by little more stably. Further, if the air introduction passage is secured by using the linear rib provided at a position away from the discharge port, the contents can be poured out little by little more stably.

[Brief description of drawings]

FIG. 1 is a schematic view showing an apparatus for producing a multilayer plastic film with linear ribs for guiding contents, which is used in the step (1) of the present invention.

FIG. 2 is a plan view showing a multi-layer plastic film with linear ribs for guiding contents, which is manufactured by the step (1) of the present invention.

FIG. 3 is a cross-sectional view showing a state in which a pressing die having linear protrusions, which is an embodiment of step (1) of the present invention, is pressed against a multilayer plastic film.

[Figure 4]

FIG. 5 is a schematic view of an apparatus for producing a packaging bag with linear ribs for guiding contents according to the present invention.

FIG. 6 is a plan view of a packaging bag that is an embodiment of the present invention.

FIG. 7 is a cross-sectional view of the packaging bag of FIG. 6 taken near the discharge port and near the air introduction port.

FIG. 8 is a plan view of a packaging bag according to another embodiment of the present invention.

9 is a cross-sectional view of the packaging bag shown in FIG. 8 taken near the discharge port and near the air introduction port.

FIG. 10 is a plan view of a packaging bag that is another embodiment of the present invention.

FIG. 11 is a plan view of a packaging bag according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view of the packaging bag of FIG. 11 taken near the discharge port.

[Explanation of symbols]

 1 Multi-layer plastic film original roll 2 Multi-layer plastic film 3 Dancer roll 4 Push type 5 Push type driving device 6 Cooling type 7 Cooling type driving device 8 Holding device 9 Holding device driving device 10 Clamp 11 Clamp driving device 12 Clamp 13 Clamp 14 Clamp 14 Clamp Drive device 15 Clamp 16 Clamp shaft 17 Clamp pitch feed device 18 Cradle 19 Dancer roll 20 Winding roll 21 Content guiding linear rib 22 Linear protrusion 23 Linear protrusion 24 Linear raised portion 25 Linear groove 26 Direction change roll 27 Cutter 28 Direction change roll 29 Bottom component 30 Roll 31 Rubber roll 32 Heat seal bar 33 Heat seal bar driving device 34 Heat seal cradle 35 Cooling type 36 Punching blade 37 Bag 38 Roll 39 roll 0 roll 41 side seal lines 42 tight sealing line 43 heat insulating material 44 outlet

Claims (2)

[Claims] 1. A packaging bag made of a multi-layered plastic film, wherein the multi-layered plastic film has a heat-adhesive plastic layer as an inner layer, and has a cross-sectional shape in which a concave portion and a convex portion are adjacent to each other on an inner surface near a discharge port. A packaging bag, characterized in that a content-guiding linear rib made of a certain linear rib is provided along the discharge flow direction of the content. 2. The thickness of the plastic film portion on which the linear protrusion is pressed by pressing a pressing die having a linear protrusion at the tip of the linear rib against the thermo-adhesive plastic layer of the multilayer plastic film. The packaging bag according to claim 1, wherein the packaging bag is provided by thinning, forming a linear groove, forming a raised portion at an upper end portion of the groove, and fixing the raised portion.