JPH0768635A - Forming method and forming apparatus before welding bag-shaped container with outflow passage - Google Patents

Abstract

PURPOSE:To increase the range of a usable synthetic resin film by molding even a thick and hard synthetic resin in a predetermined protrusion amount. CONSTITUTION:A method for molding a baglike vessel with a run-off passage before fusion-bonding comprises the steps of fusion-bonding peripheries of superposed synthetic resin films to form a bag for filling fluidized object, communicating the passage of a non-fusion-bonded part with an upper fusion-bonded part with the bag at its base end, expanding to allow a run-off passage forming part of the film to an outer surface side to protrude before the upper side of the film is fusion-bonded in order to manufacture the vessel with the passage formed by disposing its closed end at a comer, wherein the passage forming part of the film 1 is inserted to be molded between a male mold 22 and a female mold 27. In this case, the molding part is heated, pressed to the mold 27 with pressurized air or vacuum sucked to the mold 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a synthetic resin film outflow passage forming portion before welding a synthetic resin film when manufacturing a bag-shaped container with an outflow passage portion. Regarding the device.

[0002]

2. Description of the Related Art As shown in FIG. 7, a bag-like container having an outflow passage portion is formed by polymerizing two rectangular synthetic resin films 1 and welding the four sides of the synthetic resin film 1 on the upper, lower, left and right sides.
The bag 6 is formed, the outflow passage 7 of the non-welded portion is formed in a bent shape on the left side portion of the upper welded portion, and the base end of the outflow passage 7 is formed into the bag 6
The closed tip of the outflow passage 7 is arranged in the upper left corner, and a cutting line 8 that crosses the closed tip of the outflow passage 7 is displayed in the upper left corner. The bag 6 contains a fluid material such as a liquid.

When the contents are to be taken out, the upper left corner is cut along the cutting line 8, the tip of the outflow passage 7 is opened to the outside, and the bag 6 is grasped by the hand to press the contents in the bag. To do. Then, a part of the pressurized content in the bag 6 flows out through the outflow passage 7 from the spout at the tip of the outflow passage. When the desired amount of the contents has been discharged, the force for gripping the bag 6 is weakened. Then,
The outflow of the contents stops. Next, the outflow passage 7 is pinched with a finger, and the contents remaining in the outflow passage 7 are squeezed out. After that, even if the bag 6 is laid sideways, the contents do not flow out from the spout unless the contents in the bag 6 are pressed.

When manufacturing such a bag-shaped container, a synthetic resin film having a performance suitable for the contents is selected, and before the upper portions of the two polymerized synthetic resin films are welded, both synthetic resin films are melted. Each of the outflow passage forming portions is molded and slightly expanded to the outer surface side so as to project.

The forming method before welding is described in Japanese Patent Publication No. 2-50 / 1998.
As disclosed in Japanese Patent No. 1823, a synthetic resin film is polymerized on a template in which a molding groove having the same shape as the outflow passage is formed, and the synthetic resin film is pressed against the template side by air pressure, hydraulic pressure or elastic force. The synthetic resin film is recessed in the molding groove of the template, and the outflow passage forming portion of the synthetic resin film is expanded toward the outer surface side by a predetermined amount and projected.

If the amount of protrusion is too small, the outflow passage forming portion of the synthetic resin film is also welded when the upper portion of the synthetic resin film is welded, and the outflow passage is not formed. On the other hand, if the amount of protrusion is too large, the contents will flow out of the spout when the bag with the spout at the tip of the outflow passage is laid down without pressing the contents in the bag. . Therefore, the above protrusion amount must be accurate.

[0007]

However, the bag-shaped container made of a synthetic resin film must use a thick and hard synthetic resin film, for example, a composite film having a low gas permeability, depending on the contents. Thick and hard synthetic resin film is difficult to mold.

On the other hand, in the above-mentioned forming method before welding, the forming force is not strong because the synthetic resin film is pressed into the forming groove of the template by air pressure, hydraulic pressure or elastic force.

Therefore, if the synthetic resin film is thick and hard, the synthetic resin film may not be sufficiently formed by the above-mentioned forming method before welding, and the protruding amount of the outflow passage forming portion may not reach a predetermined amount. That is, when the upper portion of the synthetic resin film is welded, the outflow passage forming portion of the synthetic resin film is also welded and the outflow passage may not be formed.

After all, in the above-mentioned forming method before welding, the range of the synthetic resin film that can be used for the bag-shaped container with the outflow passage portion is narrow.

An object of the present invention is to solve the above conventional problems.

[0012]

SUMMARY OF THE INVENTION According to the present invention, the periphery of a polymerized synthetic resin film is welded to form a bag containing a fluid material, and an outflow passage of a non-welded portion is formed in the upper welded portion. Before manufacturing the bag-shaped container with the outflow passage formed by connecting the base end to the inside of the bag and arranging the closed tip at the corner, the synthetic resin film before welding the upper part of the synthetic resin film. In the molding method of expanding the outflow passage forming portion to the outer surface side so as to project, the outflow passage forming portion of the synthetic resin film is formed by being sandwiched between a male forming die and a female forming die.

Further, during the molding, a method is characterized in that the outflow passage forming portion of the synthetic resin film is heated, pressed against the female forming die with high pressure air, or sucked under reduced pressure into the female forming die. Is.

Further, a male forming die and a female forming die are provided so as to face each other, and a convex portion and a concave portion having a shape corresponding to the outflow passage are provided on the inner side surfaces of the male forming die and the female forming die, respectively. The apparatus is characterized in that the convex portion of the shaping die and the concave portion of the female forming die are fitted to each other with the outflow passage forming portion of the synthetic resin film interposed therebetween.

Further, the present invention is characterized in that one or both of the male forming die and the female forming die is provided with a heating device so that the outflow passage forming portion of the synthetic resin film is heated at the time of molding.

Further, the male forming die is provided with an air supply passage opening to the convex surface so as to be connectable to a high-pressure air source, and the synthetic resin film outflow passage forming portion is formed from the convex surface of the male forming die during molding. The device is characterized in that the high-pressure air blown out is pressed against the concave portion of the female forming mold.

Further, the female forming die is provided with an air discharge passage opening to the concave surface thereof so as to be connectable to an air suction device, and the synthetic resin film outflow passage forming portion is formed in the concave portion of the female forming die where the pressure is reduced during molding. This is a molding apparatus having a structure for sucking.

[0018]

In the present invention, in manufacturing the bag-shaped container with the outflow passage portion made of the synthetic resin film, before the synthetic resin film is welded, the portion where the outflow passage of the synthetic resin film is formed is the male forming type and the female forming type. It is sandwiched between forming molds and molded.

During the molding, the outflow passage forming portion of the synthetic resin film is heated, pressed by high pressure air to the female forming die, or the female forming mold is formed depending on the formability of the synthetic resin film. It is sucked under reduced pressure into a shape.

[0020]

According to the present invention, the synthetic resin film is sandwiched between the male forming die and the female forming die to form the outflow passage forming portion of the synthetic resin film. Compared to the conventional method of pressing with pressure or elastic force,
Even a thick and hard synthetic resin film, which has a high molding force and is difficult to mold by the conventional method, can be molded with a predetermined protrusion amount.

Further, during the molding, the molding portion of the synthetic resin film is heated, pressed against the female forming die with high pressure air, or sucked under reduced pressure to the female forming die, so that the synthetic resin is more difficult to form. A film can also be formed into a predetermined amount of protrusion.

Therefore, the range of the synthetic resin film that can be used for the bag-shaped container with the outflow passage portion is wider than that of the conventional method.

[0023]

EXAMPLE A bag-shaped container with an outflow passage portion in this example is
The synthetic resin film 1 is a composite film obtained by laminating several kinds of films such as nylon film, polyethylene film, polypropylene film, polyester film, and aluminum foil, and as shown in FIG. 1, two rectangular synthetic resin films 1 Of the synthetic resin film 1, the upper left part 2, the lower part 3 and the left and right side parts 4 are welded to form a bag 6 having the upper right part 5 as an opening. The outflow passage 7 of the non-welded portion is formed in a bent shape at the welded portion of, the base end of the outflow passage 7 is communicated with the bag 6, and the closed tip of the outflow passage 7 is arranged in the upper left corner. A cutting line 8 that crosses the closed tip of the outflow passage 7 is displayed at the left corner.

This bag-shaped container has an opening 5 on the upper right side.
A fluid material such as a liquid is put in the bag 6 and the opening 5 is welded to seal the content as shown in FIG.
When taking out the contents, it is the same as the conventional case.

As shown in FIG. 2, a bag-making apparatus for manufacturing a bag-shaped container having an outflow passage portion according to the present embodiment has an upper core shaft and a lower core that are wound with a long belt-shaped synthetic resin film. A film supply device 11 is provided, in which a belt-shaped synthetic resin film 1 is drawn out from each of the shafts, both synthetic resin films 1 are vertically stacked, and are horizontally forwarded intermittently.

Further, as shown in FIG. 2, along the supply passage of the synthetic resin film 1, a portion to be the outflow passage 7 of the upper and lower bags of the synthetic resin film 1 is formed every time the supply of the synthetic resin film 1 is stopped. The forming device 12 before welding, and the part which becomes the upper left part 2 of the bags of both synthetic resin films 1 are connected to the outflow passage 7
A sealing device 13 for welding except the portion to be welded, a device 14 for cooling the welded portion, a sealing device 15 for welding the portions of both synthetic resin films 1 to be the lower portions 3 of the bags, and cooling the welded portion. Device 16, a sealing device 17 that welds the portions of both synthetic resin films 1 that are the right side portions 4 of the bags, a sealing device 18 that welds the portions of both synthetic resin films 1 that are the left side portions 4 of the bags, and both Bag 6 of synthetic resin film 1
A cutter device 19 for cutting between the portion and the adjacent bag 6 portion is sequentially arranged.

As shown in FIG. 3, the forming apparatus 12 before welding of the present embodiment has a pair of guide rollers 21 for separating the upper and lower synthetic resin films 1, which are polymerized vertically, at the front position and the rear position, respectively. And the male forming mold 2 is provided at the inside position and the outside position of both synthetic resin films 1 separated from each other.
2 and the female forming die 27 are provided so as to face each other.

As shown in FIGS. 3 and 4, the male forming mold 22 has an outer surface fixed to a fixing plate 23 and a convex portion 24 having a shape corresponding to the outflow passage 7 of the bag-shaped container on the inner surface. Provided, the heating part of the electrothermal heating device 25 is built in, the terminals of the electrothermal heating device 25 are connected to a power source (not shown), and an air supply passage 26 having a tip opening on the surface of the convex portion 24 is provided. Is connected to a high pressure air source (not shown).

As shown in FIGS. 3 and 5, the female forming die 27 has an outer surface fixed to the movable plate 28, and a concave portion 29 having a shape corresponding to the outflow passage 7 of the bag-shaped container is provided on the inner surface. , The heating part of the electrothermal heating device 30 is built-in, the terminals of the electrothermal heating device 30 are connected to a power source (not shown), and an air discharge passage 31 having a tip opening on the surface of the concave portion 29 is provided. The end is connected to an air suction device (not shown).

As shown in FIG. 6, the female forming die 27 is movably provided on the male forming die 22 side, and the convex portion 2 of the male forming die 2 is provided.
4 and the female-shaped concave portion 29 are fitted to each other with the outflow passage forming portion of the synthetic resin film 1 interposed therebetween.

In the molding apparatus 12 before welding in this example,
As shown in FIG. 6, each time the supply of the synthetic resin film 1 is stopped, the female forming die 27 moves to the male forming die 22 side, and the outflow passage forming portions of both the upper and lower synthetic resin films 1 are separated. Each of them is molded by being sandwiched between the male forming die convex portion 24 and the female forming die concave portion 29, and is expanded and protruded by a predetermined amount to the outer surface side.

When it is difficult to mold the synthetic resin film 1 by the male and female molds 22 and 27, an electrothermal heating device 25 built in the male forming mold 22 and an electroheating type built in the female forming mold 27. The male forming mold 22 is operated by operating one or both of the heating devices 30.
And one or both of the female forming die 27 are heated to about 120 to 220 ° C., and the outflow passage forming portion of the synthetic resin film 1 is heated by one or both of the male forming die 22 and the female forming die 27. Meanwhile, it is sandwiched between the male forming die 22 and the female forming die 27 for molding. That is, thermocompression molding is performed.

When it is difficult to form the synthetic resin film 1 by thermocompression molding, high pressure air is supplied to the air supply passage 2 of the male forming die 22.
6 to be ejected from the opening of the convex portion 24 surface of the male forming die 22, and the outflow passage forming portion of the synthetic resin film 1 is blown out from the convex portion 24 surface of the male forming die 22 1 to 6 kgf / cm ²
While being pressed against the concave portion 29 of the female forming die 27 with the high-pressure air of (3), the male forming die 22 and the female forming die 27 are sandwiched and molded. That is, pressure molding is performed. At this time, thermocompression molding is used together or not.

When the synthetic resin film 1 is more difficult to form, the air suction device is operated to discharge the air in the concave portion 29 of the female forming die 27 through the air discharge passage 31 at a pressure of 1 to 6 kgf / cm ^2. , The outflow passage forming portion of the synthetic resin film 1,
While being sucked into the concave portion 29 of the female forming die 27 to be depressurized, it is sandwiched between the male forming die 22 and the female forming die 27 for molding. That is, vacuum molding is performed. At this time, pressure molding or hot pressure molding is used together or not.

In short, the synthetic resin film 1 is formed by appropriately combining mold forming and hot pressure forming, pressure forming or reduced pressure forming, depending on its formability.

Then, a composite film having a thickness of about several tens to 200 μm is formed in a predetermined manner.

In this example, the range of the synthetic resin film that can be used for the bag-shaped container with the outflow passage portion is wide, and the range of the material that can be sealed in the bag-shaped container with the outflow passage portion is wide.

In the embodiment, the contents are put in after bag making, but the contents may be put in during bag making.

[Brief description of drawings]

FIG. 1 is a perspective view of a bag-shaped container with an outflow passage portion according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a bag manufacturing apparatus in the same example.

FIG. 3 is a vertical cross-sectional side view of the molding apparatus of the same example before welding.

FIG. 4 is a perspective view of a male forming mold of the molding apparatus before welding in the same example.

FIG. 5 is a perspective view of a female forming mold of the molding apparatus before welding in the same example.

FIG. 6 is a vertical cross-sectional side view of the molding apparatus before welding of the same example at the time of molding.

FIG. 7 is a perspective view of the bag-shaped container with the outflow passage portion in the same example when the contents are sealed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin film 2 Upper left part 6 Bag 7 Outflow passage 12 Molding device before welding 22 Male forming mold 24 Convex part 25 Electrothermal heating device 26 Air supply passage 27 Female forming mold 29 Recess 30 Electrothermal heating device 31 Air exhaust passage

Claims (6)

[Claims] 1. A bag for containing a fluid material is formed by welding the periphery of a polymerized synthetic resin film, and the outflow passage of the non-welded part is connected to the upper welded part in the bag. At the time of manufacturing a bag-shaped container with an outflow passage portion formed by arranging its closed tip at a corner portion, the outflow passage forming portion of the synthetic resin film is formed on the outer surface side before welding the upper portion of the synthetic resin film. In a molding method of inflating and projecting into a mold, the outflow passage forming part of the synthetic resin film is sandwiched between a male forming die and a female forming die and formed, Method. 2. The molding method according to claim 1, wherein the outflow passage forming portion of the synthetic resin film is sandwiched between the male forming die and the female forming die to form the outflow passage forming portion of the synthetic resin film. A molding method, which comprises heating, pressing with high-pressure air to the female forming die, or sucking under reduced pressure into the female forming die. 3. A bag for containing a fluid material is formed by welding the periphery of a polymerized synthetic resin film, and the outflow passage of the non-welded portion is connected to the upper welded portion at the base end thereof. At the time of manufacturing a bag-shaped container with an outflow passage portion formed by arranging its closed tip at a corner portion, the outflow passage forming portion of the synthetic resin film is formed on the outer surface side before welding the upper portion of the synthetic resin film. In the molding device for inflating and projecting, the male forming die and the female forming die are provided so as to face each other, and the convex portion and the concave portion having a shape corresponding to the outflow passage are formed on the inner side surfaces of the male forming die and the female forming die, respectively. Before welding of the bag-shaped container with the outflow passage portion, the male forming die convex portion and the female forming die concave portion are fitted to each other with the outflow passage forming portion of the synthetic resin film sandwiched therebetween. Molding equipment. 4. The molding apparatus according to claim 3, wherein a heating device is attached to one or both of the male forming die and the female forming die to heat the outflow passage forming portion of the synthetic resin film during forming. A molding device characterized in that 5. The molding apparatus according to claim 3 or 4, wherein the male forming die is provided with an air supply passage opening to a convex surface thereof so as to be connectable to a high pressure air source, and a synthetic resin film outflow passage forming portion. The molding device is characterized in that the high pressure air blown from the convex surface of the male forming die is pressed against the concave portion of the female forming die during molding. 6. The molding apparatus according to claim 3, 4 or 5, wherein the female forming die is provided with an air discharge passage having an opening in its concave surface so as to be connectable to an air suction device, and an outflow passage for the synthetic resin film is formed. A molding apparatus having a structure in which a portion is sucked into a concave portion of a female forming die that is depressurized during molding.