JP3087797B2 - Packaging bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag in which the contents are easily poured from the outlet of the packaging bag filled with the contents, and at the same time, the rigidity of the outlet of the packaging bag is imparted. is there.

[0002]

2. Description of the Related Art In recent years, packaging bags made of plastic film have been used in large quantities in order to divide and package powders and liquids. As this kind of packaging bag, a pillow bag attached to a palm, a three-sided sealed bag, a 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 the contents are usually sealed at the filling port so that the contents do not leak. In order to take out the contents filled in these packaging bags from the packaging bags, it is common practice to cut out a portion serving as a discharge port of the packaging bags and pour the contents out of the cutout portions. By the way, when the contents are poured out from the packaging bag, the plastic film near the discharge port may be in close contact, and the contents may not be easily discharged. In this case, the contents are forcibly poured out by grasping the bag with the hand and pressing, but there is a drawback that the contents jump out at once and it is difficult to pour out the contents little by little. Another disadvantage is that the shape of the outlet is not constant because the strength of the outlet is weak, and the shape of the outlet changes during pouring, which makes it difficult to pour out an appropriate amount of the contents little by little. 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 S-shaped and the periphery is sealed, and when the bag is not pressed, the film of the bag is adhered and the contents leak. There has been proposed a packaging bag in which the contents are discharged from an S-shaped discharge port when the bag is pressed so that the contents are not pressed. However, this packaging bag also has the drawback that it is difficult to adjust the force of pressing the bag, and it is difficult to pour out the contents little by little.

[0003]

SUMMARY OF THE INVENTION In view of the drawbacks of the conventional packaging bags, an object of the present invention is to provide a packaging bag in which the contents can be poured out little by little and the rigidity of the outlet is increased. It was done.

[0004]

The inventor of the present invention has made intensive studies to develop the above-mentioned packaging bag. As a result, the present inventors have found that the vicinity of the outlet of the packaging bag made of a multilayer plastic film having a heat-adhesive resin layer on the inner surface layer. On at least one side of the inner surface, a linear rib having a cross-sectional shape in which a concave portion and a convex portion are adjacent to each other is provided along the flow direction in which the content is discharged. It has been 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 relates to a packaging bag composed of a multilayer plastic film, wherein the multilayer plastic film has a heat-adhesive plastic layer as an inner layer, and is integrally formed on the inner surface of the multilayer plastic film near an outlet of the packaging bag by unevenness. A content-guiding linear rib is formed along the discharge flow direction of the content, the linear rib having a cross section having a shape in which a concave portion and a convex portion having a height of 20 to 500 μm are adjacent to each other. The packaging bag characterized in that the linear projections are pressed by a pressing die having a linear projection at the tip against the heat-adhesive plastic layer of the multilayer plastic film. The thickness of the pressed plastic film portion is reduced, a linear groove is formed, and a raised portion is formed at the upper end of the groove, and the raised portion is formed. There is provided a packaging bag provided whereby immobilized.

Hereinafter, the present invention will be described in detail. The packaging bag of the present invention comprises a multilayer plastic film, and the multilayer plastic film has an inner layer having a heat-adhesive plastic layer. The multilayer plastic film is not particularly limited as long as it has a heat-adhesive plastic layer in the inner layer, and various types can be used. Various plastics can be used as the material of the heat-adhesive plastic layer of the inner layer.For example, polyethylene, polyolefins such as 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 a copolymer of a monomer copolymerizable with ethylene such as a vinyl acetate copolymer and an ethylene-acrylic acid copolymer, and an ionomer.These substances may be used alone. A combination of more than one species may be used. In addition, when the bag is a self-supporting bag and the body component and the bottom component of the bag are different, the respective inner plastic layers may be the same type of plastic or different plastics. The same thing is preferable because it is easy to adhere. Further, the inner plastic layer may be a single layer or a multilayer structure having two or more layers.

As the multilayer plastic film, a laminated film in which a film made of the above-mentioned plastics and other various plastics is laminated on an inner thermo-adhesive plastic layer can be used, but a multilayer plastic film in which plastic films having different melting points are laminated. Film is preferred. Multi-layer plastic films with different melting points have different melting points.When a linear projection is pressed against a low-melting point plastic film at a temperature near the melting point of a low-melting point plastic film, the high-melting point plastic film does not melt. A linear groove can be formed only in the plastic film layer having a low melting point. It is preferable to use a multilayer plastic film having a difference in the melting point because it is difficult to cut the plastic film even when the linear projection is pressed too much. In the case of a multilayer plastic film of three or more layers, if a plastic film with a lower melting point is used for the inner layer and the outer layer than the intermediate layer, the linear projections are pressed from both sides at the same time, A part can be formed.

The difference in melting point is not particularly limited, but preferably has a difference of 10 ° C. or more, particularly 20 ° C.
Those having the above difference are preferable, and those having a 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. Also, in order to impart a barrier property to the multilayer plastic film, the intermediate layer may be made of aluminum foil, a saponified copolymer of ethylene and vinyl acetate (EVOH), or a plastic film using vinylidene chloride. Can be. Further, as the multilayer 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,
Printed multilayer plastic films can also be used.

Although the thickness of the multilayer plastic film is not particularly limited, it 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 heat-adhesive plastic layer of the inner layer is not particularly limited, but is preferably 20 to 300 μm, and particularly preferably 50 to 250 μm. In the packaging bag of the present invention, it is necessary to provide a content-guiding 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 any shape as long as a linear groove having a concave section and a linear projection having a convex section are adjacent to each other. 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 μm.
00 μm. The depth of the linear groove is particularly preferably within the thickness range of the inner layer of the multilayer plastic film, but it is also possible to form the linear groove beyond the thickness of the heat-adhesive plastic layer as the inner layer. The height and width of the linear protrusions of the formed linear ribs may be appropriately selected and determined according to the required rigidity, but the height of the protrusions is usually 20 to 500 μm.
m, and preferably 50 to 300 μm. In addition,
Here, the height of the protrusion refers to the height from the surface of the portion of the plastic film having the linear rib where the linear rib is not provided to the top of the protrusion.

[0010] In order to efficiently bring out the effect of the linear ribs for guiding the contents, the linear ribs need to be provided along the direction of discharge and flow of the contents. The content-guiding linear rib may be provided along the direction in which the content is discharged, and may have a linear shape or a curved shape.
The number of the content guiding linear ribs may be appropriately selected according to the required performance, and may be one or more per inner surface near the discharge port, or may be two or more, but preferably two or more. There are five. When there are two or more linear ribs, they may be separated from each other or connected. The length of the linear rib for guiding the contents may be any length that can secure the passage for discharging the contents, and may be appropriately selected according to the size of the bag, the size and the shape of the discharge port, 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 outlet, but is preferably applied to both surfaces, and particularly preferably symmetrically applied to both surfaces.

The content-guiding linear rib according to the present invention can secure at least one content discharge passage and also can secure 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, when one linear rib for guiding the contents is provided on the inner surface of the outlet of the bag, one path is provided above and below the linear rib for guiding the contents. At least one of the two passages can function as a content discharge passage, and the other passage can function as an air introduction passage. 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. Then, by connecting the linear rib for guiding the contents and the linear rib for introducing air,
The effects of the present invention can be further enhanced. The number of linear ribs for air introduction 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 a position which is 15 to 40% inward from the side seal line, particularly 20 to 3
Positions that are 0% apart are preferred. The shape of the portion extending from the lower end of the linear rib is preferably a straight line or a curve, and particularly preferably a straight line. Further, the linear rib for guiding the contents of the present invention reduces the thickness of the plastic film portion against which the linear projection is pressed by pressing a pressing die having a linear projection at the tip against the plastic film. Preferably, a linear groove is formed, a raised portion is formed at the upper end of the groove, and a linear rib is provided by fixing the raised portion. The packaging bag of the present invention is not particularly limited as long as it is a packaging bag made of a multilayer plastic film, and may be, for example, a flat bag, a self-supporting bag such as a Doipack shape, a gusset shape, or the width of the bottom and top of the bag. However, various shapes can be applied, such as those having the same shape, those having the upper portion narrower than the width of the bottom portion of the bag.

Next, an example of a method of manufacturing the packaging bag with the linear ribs for guiding contents according to the present invention will be described. In the method for producing a packaging bag with linear ribs for guiding contents according to the present invention, the pressing die having a linear projection at the tip is pressed against a multilayer plastic film having a heat-adhesive plastic layer on the surface layer. The thickness of the multilayer plastic film pressed against the linear projections 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 multilayered linear rib. Step (1) of providing a plastic film is performed.

In this step (1), it is necessary to press a stamping die having a linear projection at the tip against the multilayer plastic film. The multilayer plastic film as a raw material in the step (1) may be supplied by cutting a long multilayer plastic film supplied from one raw roll into two pieces in the longitudinal direction. The cutting in the longitudinal direction may be performed according to the shape of the bag to be manufactured. However, it is preferable that the cutting is performed at the center line in the longitudinal direction of the multilayer plastic film which is not usually cut because there is no waste. When the multilayer plastic film as the raw material is supplied to the step (1) in this way, the printing displacement is reduced by making the distances to the step (3) of the cut multilayer plastic films equal to each other. It is preferable because it is easy to manufacture a bag without any. In this case, the linear ribbing in the step (1) may be performed on one of the two multilayer plastic films or on both.

The pressing die used in the step (1) has a linear projection at the tip. By pressing the linear projection against the multilayer plastic film, the thickness of the plastic film pressed against the projection can be reduced to form a linear groove, and the linear projection rises at the upper end of the groove. A part can be formed.
The height of the linear projection is required to be able to form at least a linear groove and not to hinder the formation of a raised portion at the upper end of the groove, and is usually 0.3 mm or more, preferably 0.3 mm or more. 5 to 3 mm. The width of the linear projection 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 projection in the width direction is usually from the tip of the projection to the base of the projection so that the linear projection can be easily removed from the formed linear groove. Either the width is the same or the width increases towards the base. The cross-sectional shape in the width direction of the tip of the linear projection can be various shapes such as a curved shape such as a circle or an arc, a straight line shape, or a combination thereof. Further, the linear projection may have a single linear shape, a single curved shape, or a combination of two or more of them.
The arrangement of the linear projections can be variously arranged. For example, one in which two or more linear projections are arranged close to each other in parallel, one in which the linear projections arranged close to each other are arranged at an interval, and one in which two or more linear projections are arranged There are various arrangements such as an arrangement in which the intervals are widened and the arrangement is made in parallel, and an arrangement in which these shapes are combined.

The method of pressing the linear projections against the multilayer plastic film as described above can be performed by various methods such as cold compression, ultrasonic oscillation at the time of pressing, and heating and pressing, but heating and pressing are preferable. . When the multilayer plastic film is heated when pressed against the linear projection, it is preferable that the multilayer plastic film is heated to a temperature equal to or higher than the melting point of the inner plastic film when pressed against the multilayer plastic film. In particular, when the multilayer plastic film is a multilayer plastic film composed of a plastic film layer having a high melting point and an inner plastic film layer having a low melting point, when a linear projection is pressed against the plastic film layer having a low melting point, the plastic film having a low melting point is pressed. It is preferable to heat the film to a temperature higher than the melting point of the film and lower than the melting point of the plastic film having a high melting point. The time for pressing the pressing die may be a time necessary for forming the protruding portion, and may be appropriately selected and determined. From the viewpoint of manufacturing efficiency, it is preferable that the pressing time is as short as possible. This time is usually from 0.3 to 3 seconds, preferably from 0.5 to 3 seconds.
2 seconds.

By pressing the linear projection,
Form a linear groove, at least one side of the upper end of the groove,
Normally, raised portions are formed on both sides. In addition, the linear projection does not push in so much as to cut the multilayer plastic film, and it is necessary that the multilayer plastic film is always connected at the bottom of the groove, and the thickness of the bottom may be appropriately selected. However, it is preferable to form a groove so as not to cut the heat-adhesive 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 any of various methods, including cooling, forced cooling such as cooling, pressing or cooling with a cooling medium, and a recess for fitting a linear rib-shaped projection. Examples of the method include pressing a mold or a combination thereof, but forced cooling is preferable because the production efficiency of the multilayer plastic film with ribs is high. The time for forced cooling may be appropriately selected according to the type of the multilayer plastic film and the pressing condition of the pressing die. By fixing the raised portions, linear ribs can be formed on the multilayer plastic film. In the step (1), a multilayer plastic film is placed on a flat mold, and a linear projection is pressed from above the multilayer plastic film. The film surface having no linear ribs is flattened on other surfaces. This is preferable because a linear rib can be provided.

It is preferable that a multilayer plastic film is pressed against both sides of a pressing die having linear projections on both front and rear surfaces, since linear ribs can be provided on two multilayer plastic films at the same time. Although the linear ribs can be provided on the multilayer plastic film as described above, in the present invention, the linear ribs may be provided on only one surface of the multilayer plastic film, or may be provided on both surfaces of the multilayer plastic film. good. Before or after step (1), a step of printing on the multilayer plastic film may be provided. In the method for manufacturing a packaging bag with a linear rib for guiding contents according to the present invention, the multilayer plastic film with a linear rib obtained in the step (1) or the multilayer plastic film obtained in the step (1) and another multilayer plastic film. 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 film which is laminated with the heat-adhesive plastic layer on the inner surface may be a separate multi-layer plastic film, or may be folded and superposed on two sheets. Multi-layer plastic film may be used. At least one of the stacked multilayer plastic films must have the linear rib formed in the step (1), and both plastic films have the linear rib. Is preferred. Step (2)
In the method, before or after the step (2), there is provided a step of attaching a bottom constitution multilayer plastic film constituting the bottom of the bag to each end of the laminated or laminated linear ribbed multilayer plastic film, and It can be a bag. The method of stacking the multilayer plastic film 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 the like. Is applied.

In the case of the self-supporting bag, the method of stacking the multilayer plastic film in the step (2) includes a self-supporting bag made of the multilayer plastic film in which the linear ribs produced in the step (1) are arranged at predetermined positions. A thermoadhesive plastic so that the bottom component of the self-standing bag manufacturing film having a trunk component constituting the trunk of the bag can be substantially W-shaped when the bottom component is bent in a mountain fold in the longitudinal direction. It is preferred that the trunk component is superimposed on the bottom component with the layer 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 applying a heat seal for forming the shape of the bag to the multilayer plastic film laminated in the step (2) 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 make the shape of the bag, and the shape of the heat seal 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 according to the present invention, a step (4) of cutting the packaging bag from the multilayer plastic film obtained in the step (3) is performed. The cutting of the bag performed in this step (4) can be performed by various means such as a cutting blade and a fusing blade.
The shape to be cut may be determined according to the shape of the bag formed on the multilayer plastic film, and cut into various cut shapes such as linear cut, curved cut, and punching.
Step (3) and step (4) may be performed simultaneously. If both steps are performed simultaneously, heat sealing and fusing can be performed simultaneously by a heat sealing blade, or a cutting blade or fusing blade is provided along the heat sealing blade, and the heat sealing blade and the cutting blade or fusing blade are simultaneously or It is preferable to perform the heat sealing and the cutting by pressing the cutting blade or the fusing blade against the multilayer plastic film slightly behind the heat sealing blade.

In the method for producing a packaging bag with a linear rib for guiding contents according to the present invention, the steps (1), (2), (3) and (4) are continuously performed to obtain a linear bag for guiding contents. It is preferable to continuously manufacture the packaging bag with the rib because the packaging bag with the rib can be efficiently manufactured. When manufacturing packaging bags with linear ribs for guiding contents continuously, use a long multilayer plastic film as the multilayer plastic film, and continuously or intermittently apply the long multilayer plastic film to the rib forming apparatus. It is preferable to feed and continuously produce a multilayer plastic film with linear ribs. The feeding of the multilayer plastic film can be performed 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 below in more detail with reference to the drawings of embodiments. The present invention is not limited by these examples. FIG. 1 is a schematic diagram of a device for forming a linear rib for guiding contents provided in a packaging bag according to the present invention. In FIG. 1, a long multilayer plastic film 2 (composition: 140 μm polyethylene film and 15 μm
(thickness: 160 μm, width: 550 mm) of a stretched nylon 6-6 film having a width of 550 m) is fed from a raw multi-layer plastic film roll 1 to a pressing mold 4 via a dancer roll 3. In the mold section, the multilayer plastic film 2 is placed on a pedestal 18 made of a flat metal with the stretched nylon 6-6 film face down.
(Flat mold). The pressing die 4 in which two linear projections having a width of 600 μm and a length of 30 mm are arranged close to each other is lowered by a pressing die driving device 5 which can move the pressing die 4 up and down. 2 against the polyethylene film layer. The linear projection having a substantially arc-shaped curved portion provided at the tip of the press die 4 is heated to 120 ° C., and the plastic film has a groove depth of 130 μm and a thickness of the bottom of the groove. Press the linear projection until is 30μm,
Hold for 1 second.

Next, the holding member 8 is lowered by the holding member driving device 9 capable of moving the holding member 8 up and down, and the multilayer plastic film 2 is pressed intermittently. Thereafter, 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 lifted, the multilayer plastic film 2 is pressed by the holding tool 8 and the cooling die 6 so that the multilayer plastic film 2 is not pulled up together with the pressing die 4. Thereby, the groove width 6
A linear groove having a thickness of 00 μm and a depth of 130 μm was formed, and linear protrusions having a height of 80 μm were formed at both ends of the upper end of the groove. Next, the holding member 8 and the cooling die 6 are pulled up, the multilayer plastic film 2 is driven by the clamps 10 and 13 by the clamp driving devices 11 and 14, and clamped by the clamps 10, 12, 13 and 15, respectively. The pitch is moved by one pitch in the horizontal direction along the clamp shaft 16 by the pitch feeder and sent to the next cooling device. After moving the multilayer plastic film 2 by one pitch, each clamp returns to the original position again.

In the cooling device, the cooling die 6 is lowered by a cooling type driving device 7 which can move the cooling die 6 up and down, and is brought close to the multilayer plastic film 2. The cooling mold 6 blows air of 25 ° C. on the surface of the multilayer plastic film 2 for 1.5 seconds. Thereafter, the cooling mold 6 is pulled up and the ribbed multilayer plastic film 2 is wound around a winding roll 20. After the air is started to be blown by the cooling die 6, the pressing die 4 is lowered and pressed against the multilayer plastic film 2. By repeating the above-described procedure, a plastic film with a linear rib for guiding the contents can be continuously manufactured. The tension of the multilayer plastic film 2 to be fed can be adjusted by a dancer roll. As a result, as shown in FIG. 2, the grooves were formed only in the polyethylene film layer, and the linear ribs for guiding the contents could be formed in the plastic film.

FIG. 3 shows a state in which the linear projections 22 and 23 at the tip of the pressing die 4 are pressed against the multilayer plastic film 2 to form the linear grooves 25 and the linear raised portions 24. It is an expanded sectional view. Linear projections 22 and 2
On the surface of the stamping die 4 where no 3 is provided, a heat insulating material 43 is provided.
Is applied, heat is transmitted from the linear projections 22 and 23 to the multilayer plastic film, and it is difficult to conduct heat to portions where the linear ribs are not provided. Thereby, the linear ribs can be efficiently provided. FIG. 4 is an enlarged cross-sectional view showing a state where the linear groove 25 and the linear protrusion 24 are formed when the interval between the linear projections 22 and 23 in FIG. 3 is reduced. At this time, the width of the linear projections 22 and 23 is 500 μm, and the interval between them is 2000 μm. Therefore, there are three linear raised portions 24.

FIG. 5 is a schematic view showing an apparatus for producing a self-supporting bag according to the present invention. In the drawing, the plastic film pulled out from the raw roll is the multilayer plastic film used in FIG. 1 and is linearly formed by the linear groove and linear ribbing device (part A) shown in FIG. Ribbed. Next, the multi-layer plastic film with linear ribs is rotated by 90 degrees by the direction changing roll 26, and then the center line in the longitudinal direction is cut by the cutter 27, and divided into two multi-layer plastic films with linear ribs. Can be The separated two-layered plastic film with linear ribs is further diverted by the direction changing roll 28 to 9
The film is rotated by 0 °, and then overlapped by the roll 30 with the side with the linear ribs inward, and the multilayer plastic film (same as the multilayer plastic film of FIG. 1) of the bottom constituting portion 29 is halved at both ends. Bend and insert. As a result, at both ends, four multilayer plastic films are stacked. Although not shown, the multilayer plastic film at the bottom constituting portion is supplied from a raw roll on the vertical side surface in FIG. Next, the laminated multilayer plastic film is placed on a heat seal receiving stand 34, and the side and bottom of the bag are heat sealed by a heat seal bar 32 to form a bag. Next, the heat-sealed multilayer plastic film was cooled by a cooling mold 35, and then cut into a bag shape by a punching blade 36 to produce a bag 37. The remaining multilayer plastic film from which the bag 37 was punched was wound by a winding roll (not shown).

FIG. 6 is a plan view of a 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 ribs need not be provided at both ends as shown in FIG. 6, but may be provided only at one end. This packaging bag has the same width
A plurality of long-length multi-layer plastic films with linear ribs (composition: a 100 μm-thick polypropylene film and a 15 μm-thick stretched nylon 6-6 film multi-layer plastic film, 120 μm in thickness) are superposed, and are vertically movable 180 It can be manufactured by pressing a heat seal bar at a temperature of ° C. and applying a side seal wire 41 constituting a side portion of the packaging bag. Since the laminated multilayer film has a polypropylene film having a low melting point on the inside, it can be easily fused with a heat seal bar at 180 ° C. This side seal line 41
Has a width of 5000 μm.

FIG. 7 is a cross-sectional view when the upper end of the packaging bag of FIG. 6 is cut in the direction of BB '. On the inner surface of the packaging bag, linear ribs for content guidance are provided symmetrically facing each other, and a passage for the content is secured,
Rigidity is also provided. As a result, the contents can be poured out little by little from this outlet. Note that the content guiding linear ribs need not be provided on both inner surfaces of the packaging bag as shown in FIG. 7, but may be provided on only one surface. FIG. 8 shows another embodiment of the packaging bag of the present invention, in which the content guiding linear rib 21 extends not only in the vicinity of the outlet but also in the entire packaging bag. In this example, two linear ribs 21 for guiding the contents are arranged at both ends of the upper part, but one is connected between both ends, and the other is connected to the lower end of the packaging bag. It is growing.

FIG. 9 is a cross-sectional view when the packaging bag of FIG. 8 is cut in the direction of CC '. A passage for the contents is secured as in FIG. Here, the discharge port B
If the linear rib on the opposite side of B 'and CC' is cut in the EE 'direction, it becomes an air introduction port into the packaging bag, and prevents pressure reduction in the packaging bag. Can be granted. FIG. 10 shows another embodiment of the packaging bag of the present invention, in which the packaging bag of FIG. 8 is 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 formed in an S-shape, and linear ribs for guiding the contents are provided on both inner surfaces of the front end of the outlet. FIG. 12 is a cross-sectional view when the packaging bag of FIG. 11 is cut in the direction of DD ′. 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 near the discharge port, a discharge passage for the contents is secured, and the contents are discharged when the contents are discharged. It can be poured out little by little without popping out at once. Moreover, since the vicinity of the discharge port is provided with rigidity by the linear ribs for guiding the contents, 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 distant from the discharge port, the contents can be more stably poured out little by little.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a multilayer plastic film with a linear rib for guiding contents 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 projections, which is one embodiment of the step (1) of the present invention, is pressed against a multilayer plastic film.

FIG. 4 is a cross-sectional view showing a state in which a pressing die having a linear projection, which is another embodiment of the step (1) of the present invention, is pressed against a multilayer plastic film.

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

FIG. 6 is a plan view of a packaging bag according to one embodiment of the present invention.

7 is a cross-sectional view of the packaging bag of FIG. 6 when the vicinity of an outlet and the vicinity of an air inlet are cut away.

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 of FIG. 8 when the vicinity of the outlet and the vicinity of the air inlet are cut off.

FIG. 10 is a plan view of a packaging bag according to 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 when the vicinity of the outlet is cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-layer plastic film raw roll 2 Multi-layer plastic film 3 Dancer roll 4 Press type 5 Push type drive 6 Cooling type 7 Cooling type drive 8 Pressing tool 9 Press driving device 10 Clamp 11 Clamp driving device 12 Clamp 13 Clamp 14 Clamp Driving device 15 Clamp 16 Clamp shaft 17 Clamp pitch feeder 18 Cradle 19 Dancer roll 20 Winding roll 21 Linear rib for guiding contents 22 Linear projection 23 Linear projection 24 Linear ridge 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 drive 34 Heat seal cradle 35 Cooling die 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)

(57) [Claims] 1. A packaging bag comprising a multilayer plastic film, wherein the multilayer plastic film has a heat-adhesive plastic layer in an inner layer, and a multilayer bag near an outlet of the packaging bag.
Integrally processing the inner surface of the plastic film
It is formed and has a concave shape and a height of 20 to 500 μm.
A packaging bag, characterized in that a content-guiding linear rib composed of linear ribs having m convex portions adjacent to each other is provided along the direction of discharge and flow of the content. 2. The thickness of the plastic film portion against which the linear projections are pressed by pressing the pressing die having the linear projections at the tips against the heat-adhesive plastic layer of the multilayer plastic film. 2. The packaging bag according to claim 1, wherein the packaging bag is provided by forming a thin groove, forming a linear groove, forming a raised portion at the upper end of the groove, and fixing the raised portion.