JP3249423B2 - Flexible container bag molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a molding method of a flexible container back grayed used for the mass transport of the particulate product, such as mineral and grains, and more particularly, a large-diameter cylindrical sheet, the large-diameter cylindrical seat And a small-diameter cylindrical sheet protruding from the circular sheet, the sheets being heat-welded to each other.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned flexible container bag has the following structure.

That is, the flexible container bag has a large-diameter cylindrical sheet whose axis is vertical. Circular sheets are respectively provided on the same axis as the large-diameter cylindrical sheet so as to correspond to the openings at the respective ends of the large-diameter cylindrical sheet, and the outer peripheral edge of each of the circular sheets and the corresponding large-diameter cylindrical sheet Are joined to each other by thermal welding. Further, a circular hole is formed on the axis of each of the circular sheets, and a pair of upper and lower small-diameter cylindrical sheets are juxtaposed on the large-diameter cylindrical sheet on the axis, and a hole edge of the circular hole and the respective small-diameter holes are formed. The opening edge of the opening on the large-diameter cylindrical sheet side of the cylindrical sheet is joined by heat welding.

[0004] Of the above and below small diameter cylindrical sheets,
The upper small-diameter cylindrical sheet is an injection section through which a product can be injected into the large-diameter cylindrical sheet, and the lower small-diameter cylindrical sheet discharges the product stored in the large-diameter cylindrical sheet therethrough. It is a discharge unit that makes it possible.

[0005] A pair of hanging members are attached to the upper outer surface of the large-diameter cylindrical sheet in the circumferential direction.
These hanging members allow the flexible container bag to be hung on the tank side in which a large amount of the product is stored in advance.

[0006] A square flange is mounted on the shaft center at the upper end, which is the other end of the above-described upper small-diameter cylindrical sheet. The flange has a shape convenient for being detachably attached to the discharge port of the tank.

When the product is transported using the flexible container bag, first, the lower small-diameter cylindrical sheet described above is closed by, for example, being bound thereto. On the other hand, the flexible container bag is hung on the tank side by the hanging member, and the square flange is attached to the outlet of the tank which is closed in advance. Next, the outlet is opened, and the product in the tank is injected into the large-diameter cylindrical sheet through the above-described small-diameter cylindrical sheet on the upper side.

When a predetermined amount of product is stored in the large-diameter cylindrical sheet, the discharge port of the tank is closed, and the square flange is removed from the discharge port, so that the upper small-diameter cylindrical sheet is removed. Is closed and transported to the destination in this state. When the lower small-diameter cylindrical sheet is opened at the destination, the product in the large-diameter cylindrical sheet can be discharged through the small-diameter cylindrical sheet.

[0009]

When the above-mentioned flexible container bag is formed, the outer peripheral edge of the circular sheet and the opening edge of the large-diameter cylindrical sheet to which the above-mentioned hanging member is attached are faced to each other. The edge of the circular hole of the circular sheet and the opening edge of the small-diameter cylindrical sheet to which the above-mentioned square flange has been attached are brought into surface contact with each other and heat-welded. Prior to doing this, the circular sheet is generally flat in shape, while the large and small diameter cylindrical sheets are cylindrical, i.e., the opposing portions that are to be brought into surface contact have different shapes. Are different.

[0010] Therefore, when the surface contact is to be performed as described above, it is necessary to apply an external force to the portion to be brought into surface contact or to make a surface contact while forcibly bending the sheet by applying an external force. As a result, after the above-described welding, wrinkles tend to occur in the welded portion and in the vicinity of each sheet (hereinafter referred to as “around the welded portion”). There is a problem that the molded flexible container bag has a poor appearance.

Further, as described above, if an attempt is made to make each part of the sheet come into surface contact by applying an external force and forcibly bending the sheet, when the circular sheet is welded to the large-diameter cylindrical sheet or the small-diameter cylindrical sheet, these parts are not welded. Are likely to deviate from the desired positions, and the assembling accuracy of these components is reduced, that is, the dimensional accuracy of the flexible container bag may be reduced.

As described above, if the accuracy of the relative position between the hanging member around the axis and the square flange is reduced due to the reduction in the dimensional accuracy of the flexible container bag, for example, the flexible container bag may be used. At the time of pouring the product, when the flexible container bag is hung on the tank side by the hanging member as described above and the square flange is to be attached to the discharge port of the tank, the accuracy of the relative position is reduced. However, there is a problem that this mounting work becomes difficult.

The present invention has been made in view of the above-mentioned circumstances, and when forming flexible container bags by welding sheets of various shapes, wrinkles are not formed around the "around the welded portion". Another object of the present invention is to improve the appearance of the flexible container bag and to further improve the dimensional accuracy of the flexible container bag.

[0014]

Molding method of a flexible container back grayed of the present invention Means for Solving the Problems] To solve the above problems is as follows.

According to the first aspect of the present invention, a large-diameter cylindrical sheet 2 is provided, and a circular sheet is provided on the same axis 3 as the large-diameter cylindrical sheet 2 so as to correspond to the opening 4 at the end of the large-diameter cylindrical sheet 2. 6
The outer peripheral edge of the circular sheet 6 and the corresponding opening edge 5 of the opening 4 of the large-diameter cylindrical sheet 2 are heat-welded, and a circular hole 7 is formed on the axis 3 of the circular sheet 6. The small-diameter cylindrical sheet 8 is formed in parallel with the large-diameter cylindrical sheet 2 on the axis 3, and the hole edge of the circular hole 7 and the opening 9 on the large-diameter cylindrical sheet 2 side of the small-diameter cylindrical sheet 8 are formed. allowed to the opening edge 10 are heat welded,

The circular sheet 6 has a flat annular circular sheet body 16 and a short cylindrical shape extending axially integrally from the outer peripheral edge of the circular sheet body 16 to form the outer peripheral edge of the circular sheet 6. A large-diameter flange 17, and a short cylindrical small-diameter flange 18 integrally extending in an axial direction from an inner peripheral edge of the circular sheet main body 16 to form a hole edge of the circular hole 7 of the circular sheet 6, The large-diameter flange 17 and the opening edge 5 of the opening 4 of the large-diameter cylindrical sheet 2 are fitted to each other and thermally welded, and the small-diameter flange 18 and the large-diameter cylindrical sheet of the small-diameter cylindrical sheet 8 are joined together. a 2 side and the opening edge 10 of the opening 9 is fitted to one another forming method of full lexical Bull container bag 1 that has been allowed to heat welding,

The first mold 3 whose outer peripheral surface 31 has a truncated cone shape
0 and on the same axis 29 as the first mold 30,
An inner peripheral surface is provided with an outer peripheral surface 31 of the first mold 30 and a second mold 33 having a truncated cone shape that is removably fitted, and between the first and second molds 30, 33, Further, an annular circular sheet material 35 which is a material for forming the circular sheet 6 is positioned on the axis 29, and from this state, the first and second circular sheets 35 are formed.
The small-diameter flange 18 is formed by fitting the outer peripheral surfaces 31 and 34 of the circular sheet material 35 between the outer and inner peripheral surfaces 31 and 34 by fitting the outer peripheral surfaces 31 and 34 of the dies 30 and 33. the way,

[0018] The small diameter end 36 of the upper Symbol first die 30 and flat cylindrical shape, the circular sheet material 3 to the small diameter end 36
The inner peripheral edge of the first and second molds 30 and 33, the inner peripheral surface 31,
34 are fitted.

The invention of claim 2, in addition to the invention of claim 1, in which the outer diameter of the small-diameter end portion 36 is variable.

According to a third aspect of the present invention, the large-diameter cylindrical sheet 2 is provided.
On the same axis 3 as the large-diameter cylindrical sheet 2.
The circular sheet 6 corresponding to the opening 4 at the end of the diameter cylindrical sheet 2
Are provided, and the outer peripheral edge of the circular sheet 6 and the corresponding
The opening edge 5 of the opening 4 of the large-diameter cylindrical sheet 2 is heat-welded.
A circular hole 7 is formed on the axis 3 of the circular sheet 6.
A small-diameter circle on the large-diameter cylindrical sheet 2 on the shaft center 3.
A cylindrical sheet 8 is provided side by side, and the hole edge of the circular hole 7 and the small
Opening of the opening 9 on the large-diameter cylindrical sheet 2 side of the large-diameter cylindrical sheet 8
The edge 10 is heat-welded,

The circular sheet 6 is a flat circular circular plate.
Sheet body 16 and the outer peripheral edge of this circular sheet body 16
The outer peripheral edge of the circular sheet 6 is extended integrally in the axial direction.
The short cylindrical large-diameter flange 17 to be constituted and the circular
And extending integrally from the inner peripheral edge of the main body 16 in the axial direction.
A short cylindrical shape forming the edge of the circular hole 7 of the circular sheet 6
And the large-diameter flange 17
The opening edge 5 of the opening 4 of the large-diameter cylindrical sheet 2 fits with each other.
Heat-welded together with the small-diameter flange
18 and the large-diameter cylindrical sheet 2 side of the small-diameter cylindrical sheet 8
The opening edge 10 of the opening 9 is fitted to the
Molding method for a flexible container bag 1
And

The axis 43 is vertical and the circular sheet body 16
A disk-shaped mold 44 having substantially the same outer diameter as that of
The upper surface 45 and the outer peripheral surface 46 of the outer edge of the disk-shaped mold 44
And a fitting mold 47 that can be freely fitted and removed at a corner 48 of the
A circular sheet material 60 which is a material for forming the circular sheet 6 is placed on the upper surface thereof on the same axis 43 as the disk-shaped mold 44, and the circular sheet material 60 is fitted by the fitting mold 47.
Is bent downward, and the outer peripheral edge is pressed against the outer peripheral surface 46 of the disk-shaped mold 44 to form the large-diameter flange 17.

Incidentally, the circular sheet material 60 is provided in the first aspect.
The invention may be equivalent to the circular sheet material 35 formed with the small-diameter flange 18 shown in the invention of the present invention, or may be a generally flat material on which the small-diameter flange 18 is not formed. Conversely, the circular sheet material 35 may correspond to the circular sheet material 60 on which the large-diameter flange 17 is formed.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a flexible container bag.

The flexible container bag 1 has a large-diameter cylindrical sheet 2 having a large diameter, and in the figure, the axis 3 of the large-diameter cylindrical sheet 2 is shown to be substantially vertical.
Circular sheets 6 are provided on the same axial center 3 as the large-diameter cylindrical sheet 2 so as to correspond to the respective openings 4 at the axial ends of the large-diameter cylindrical sheet 2. The large-diameter cylindrical sheet 2 and the circular sheet 6 are both made of thermoplastic and flexible resin, and the outer peripheral edge of each of the circular sheets 6 and the corresponding opening 4 of the large-diameter cylindrical sheet 2 are formed. The opening edge 5 is heat-welded to each other to be firmly joined.

A circular hole 7 is formed on the axis 3 of each circular sheet 6. A pair of upper and lower small-diameter cylindrical sheets 8 having a smaller diameter than the large-diameter cylindrical sheet 2 are arranged on the shaft center 3 in parallel with the large-diameter cylindrical sheet 2 above and below the large-diameter cylindrical sheet 2. ing. The small-diameter cylindrical sheet 8 is also made of a thermoplastic and flexible resin, and has a hole edge of each circular hole 7 and a corresponding opening 9 of the small-diameter cylindrical sheet 8 on the large-diameter cylindrical sheet 2 side. The opening edge 10 and the opening edge 10 are heat-welded to each other to be firmly connected.

The upper small-diameter cylindrical sheet 8 among the upper and lower small-diameter cylindrical sheets 8 is an injection section through which the product 11 can be injected into the large-diameter cylindrical sheet 2. The small-diameter cylindrical sheet 8 is a discharge unit through which the product 11 stored in the large-diameter cylindrical sheet 2 can be discharged.

On the upper outer peripheral surface of the large-diameter cylindrical sheet 2,
A pair of hanging members 1 made of rope or belt in the circumferential direction
2 and 12 are attached.
2 is provided at a position facing the large-diameter cylindrical sheet 2 in the radial direction. These hanging members 12 enable the flexible container bag 1 to be hung on a tank (not shown) that stores a large amount of the product 11 in advance.

A square flange 13 is mounted on the shaft center 3 at the upper end, which is the other end of the upper small-diameter cylindrical sheet 8 described above. The square flange 13 has a shape convenient for being detachably attached to the outlet of the tank.

When the product 11 is transported by using the flexible container bag 1, first, the lower small-diameter cylindrical sheet 8 described above is closed by being tied or the like. On the other hand, the flexible container bag 1 is hung on the tank side by the hanging member 12, and the square flange 13 is attached to the outlet of the tank which is closed in advance. Next, the outlet is opened, and the product 11 in the tank is injected into the large-diameter cylindrical sheet 2 through the small-diameter cylindrical sheet 8 on the upper side.

Thus, when a predetermined amount of the product 11 is stored in the large-diameter cylindrical sheet 2, the outlet of the tank is closed, and the square flange 13 is removed from the outlet to remove the upper flange. The small-diameter cylindrical sheet 8 is closed and transported to the destination in this state. If the lower small-diameter cylindrical sheet 8 described above is opened at this destination, the product 11 in the large-diameter cylindrical sheet 2 can be discharged through the small-diameter cylindrical sheet 8.

The structure of the flexible container bag 1 will be described in more detail.

Each of the circular sheets 6 has a flat annular (doughnut-shaped) circular sheet body 16 on the axis 3, and the large-diameter cylinder in the axial direction from the outer peripheral edge of the circular sheet body 16. A short cylindrical large-diameter flange 17 integrally extending toward the sheet 2 side to form an outer peripheral edge of the circular sheet 6, and the large-diameter cylindrical sheet 2 extending in an axial direction from an inner peripheral edge of the circular sheet main body 16. And a short cylindrical small-diameter flange 18 extending integrally in a direction away from the flange and forming a hole edge of the circular hole 7 of the circular sheet 6.

The large-diameter flange 17 and the corresponding opening edge 5 of each opening 4 of the large-diameter cylindrical sheet 2 are fitted to each other and brought into surface contact with each other. In this state, the large-diameter flange 17 and the opening edge 5 are connected to the heat welding device 2.
0 for heat welding. The small-diameter flange 18 and the corresponding opening edge 10 of the opening 9 of the small-diameter cylindrical sheet 8 are fitted to each other and brought into surface contact with each other. In this state, the small-diameter flange 18 and the opening edge 10 are thermally welded by the thermal welding device 20.

The heat welding device 20 is a high-frequency welder, and a pair of first electrodes 21 and 21 for sandwiching the large-diameter flange 17 and the opening edge 5 from inside and outside of the flexible container bag 1 for heat welding. The small-diameter flange 18 and the opening edge 10 are provided with a pair of second electrodes 22, 22 which are sandwiched between the inside and outside of the flexible container bag 1 for heat welding.

When the large-diameter cylindrical sheet 2, the circular sheet 6, and the small-diameter cylindrical sheet 8 are joined by heat welding to each other, the outer surface of each of the sheets 2, 6, and 8 is previously provided on the outer surface thereof. A linear reference mark 2 extending parallel to the axis 3 and extending in the radial direction is provided at one portion having a direction.
4 are provided.

When the sheets 2, 6, and 8 are to be joined by heat welding, the respective reference indications 24 are aligned in the circumferential direction and are heat-welded. In the circumferential direction of the axis 3, the relative positions of the above-mentioned sheets 2, 6, 8 and the hanging member 12 and the square flange 13 are set to desired positions, so that good assembly accuracy can be obtained. It has become.

According to the above configuration, the portions (opening edge 5,
10, large diameter flange 17, and small diameter flange 18)
Are formed in a tubular shape so as to make surface contact with each other in advance, that is, when they are brought into surface contact, unnecessary bending of these opposing portions is unnecessary.

Therefore, since the unnecessary bending as described above is unnecessary, wrinkles are prevented from being generated around the "welded portion", and the appearance of the flexible container bag 1 is improved.

In addition, since the above-mentioned unnecessary bending is not required, even when the circular sheet 6 is welded to the large-diameter flange 17 or the small-diameter flange 18, their relative positions are shifted from a desired position. Are prevented, and the assembling accuracy is improved, that is, the dimensional accuracy of the flexible container bag 1 is further improved.

As described above, when the dimensional accuracy of the flexible container bag 1 is improved and the accuracy of the relative position between the hanging member 12 around the axis 3 and the square flange 13 is improved, this flexible container bag 1 becomes flexible. At the time of injecting the product 11 into the container bag 1, as described above, when the flexible container bag 1 is hung on the tank side by the hanging member 12 and the square flange 13 is to be attached to the outlet of the tank, This mounting work is facilitated by the improvement in the accuracy of the relative position.

In FIGS. 4 to 9, reference numeral 26 denotes a small-diameter flange forming device for forming the small-diameter flange 18 described above.

The small-diameter flange forming apparatus 26 has a base 27 such as a trolley, on which a first mold 30 whose axis 29 is substantially perpendicular is fixed, and an outer periphery of the first mold 30. The surface 31 has a truncated conical shape tapering upward. In addition, a second mold 33 is provided above the first mold 30 and on the shaft center 29 so as to be able to move up and down.
The inner peripheral surface 34 has a truncated cone shape that can be fitted and detached from the outer peripheral surface 31 of the first mold 30.

That is, by lowering the second mold 33,
If the first and second dies 30, 33 are moved relatively close in the axial direction, the outer peripheral surface 31 and the inner peripheral surface 34 can be fitted.

As described above, the outer peripheral surface 3 of the first mold 30
1 has an upwardly tapered shape, so that the upper end of the outer peripheral surface 31 is a small-diameter end 36 having a smaller diameter than the lower end thereof. The small-diameter end portion 36 has a flat and substantially cylindrical shape. Of course, the small-diameter end portion 36 is located on the axis 29.

In particular, as shown in FIG.
6, an inner peripheral edge of an annular (doughnut-shaped) circular sheet material 35, which is a material for forming the circular sheet 6, can be fitted in a press-contact manner.

Referring to FIG.
In the case of molding, first, as described above, the inner peripheral edge of the circular sheet material 35 is externally fitted to the small-diameter end portion 36. Then, the axis 3 of the circular sheet material 35 is positioned on the axis 29.

Next, as shown in FIG. 6, from the state where the circular sheet material 35 is externally fitted to the small diameter end portion 36, as shown in FIG. , 34 are fitted together. Then, the outer peripheral surface 31 and the inner peripheral surface 34
The edge of the circular hole 7 is sandwiched between them and pressed, and the small-diameter flange 18 is accurately formed.

As shown in FIG. 7, the small-diameter flange 18
If the first and second dies 30, 33 are moved away from each other after the molding, a circular sheet material 35 having the small-diameter flange 18 formed thereon can be obtained.

The first mold 30 has a mold body 37 fixed to the upper surface of the base 27 and having the outer peripheral surface 31 in the shape of a truncated cone, and a fastening means 3 attached to the upper surface of the mold body 37.
And a plurality (four) of movable adjustment pieces 39 in the circumferential direction which are detachably fastened by 8 and these movable adjustment pieces 39 constitute the small-diameter end 36.

When the fastening means 38 is loosened, each of the movable adjustment pieces 39 can be freely moved to a desired position in the radial direction of the shaft center 29, and this movement and each of the movable adjustment pieces 39 by the fastening means 38 are performed. The outer diameter of the small-diameter end portion 36 is made variable by the fastening.

For this reason, when there is some variation in the material of the circular sheet material 35 serving as the material of the circular sheet 6 and there is an error in the inner diameter, or when the elastic coefficient of itself is not constant, By adjusting the outer diameter of the small diameter end 36, the elastic fitting force of the inner peripheral edge of the circular sheet material 35 to the small diameter end 36 can be adjusted to a desired size.

Therefore, the positioning of the circular sheet material 35 by fitting the inner peripheral edge of the circular sheet material 35 to the small-diameter end portion 36 can be performed more accurately and more reliably.

8 to 13, reference numeral 41 denotes a large-diameter flange forming apparatus for forming the large-diameter flange 17.

8 and 9, the large-diameter flange forming apparatus 41 has a base 42 such as a bogie, and a disk-shaped mold 44 having an axis 43 substantially perpendicular to the base 42 is provided on the base 42. 43
It is supported so that it can rotate freely. The above disk-shaped mold 4
Reference numeral 4 denotes a driving means such as a motor (not shown), which is rotatable intermittently in one direction, can be arbitrarily rotated, and can be stopped at any position. The outer diameter of the disc-shaped mold 44 is substantially the same as the outer diameter of the circular sheet body 16.

The upper surface 45 of the outer edge of the disk-shaped mold 44
There is provided a fitting die 47 which can be freely fitted to and removed from a corner portion 48 of the outer peripheral surface 46. The fitting mold 47 includes an upper mold 51 that can be joined to the upper surface 45 at the time of the fitting, and a side mold 52 that can be joined to the outer peripheral surface 46. 52 are connected to each other.

The operating means 5 for operating the fitting mold 47 so that the fitting mold 47 is fitted into and disengaged from the corner 48.
4 are provided. The actuating means 54 is located near the outer side of the disk-shaped mold 44 and pivots the fitting mold 47 to the base 42 so that the fitting mold 47 can rotate up and down. A support shaft 55 and a rotation cylinder 56 for rotating the fitting mold 47 up and down around the pivot shaft 55.
And a pushing cylinder 57 that pushes the fitting mold 47 in the radial direction of the disc-shaped mold 44 so as to join the side mold 52 to the outer peripheral surface 46.

When the fitting mold 47 is rotated upward by the rotating cylinder 56 of the operating means 54 (solid line in FIGS. 8 and 9), the upper mold 51 and the side mold of the fitting mold 47 are formed. 52 is separated from the corner 48 to the outside and upward. On the other hand, the fitting cylinder 47 is
Is rotated downward (indicated by a dashed line in FIG. 9), the upper mold 51 of the fitting mold 47 is joined to the upper surface 45 of the corner 48, and at this time, the side mold of the fitting mold 47 is formed. Reference numeral 52 is slightly separated outward from the outer peripheral surface 46 of the corner portion 48.

When the pushing cylinder 57 is operated from the above state, the fitting die 47 is moved toward the corner 48, and the side mold 52 of the corner 48 is moved to the corner 4.
8 can be joined to the outer peripheral surface 46.

In FIG. 10, when the large-diameter flange 17 is formed, the same shaft center 4 as the disk-shaped mold 44 is used.
3 on the upper surface of the disk-shaped mold 44.
A circular sheet material 60 on which the small-diameter flange 18 has already been formed is placed. Reference numeral 61 denotes a positioning guide. When the circular sheet material 60 is placed as described above, if the outer peripheral edge of the circular sheet material 60 is brought into contact with the positioning guide 61, the axial center 3 of the circular sheet material 60 is formed.
Are located on the axis 43 of the disk-shaped mold 44.

In FIG. 11, when the fitting die 47 is rotated downward by the rotary cylinder 56, the outer peripheral edge of the circular sheet material 60 is pressed by the side die 52 and bent downward. And is brought close to the outer peripheral surface 46 of the corner 48. At this time, the upper mold 51 presses against a portion of the circular sheet material 60 placed on the upper surface 45 of the corner portion 48 to prevent wrinkles from being formed on the circular sheet material 60. .

In FIG. 12, from the above state, the pushing cylinder 57 is operated to move the side mold 52 of the fitting mold 47 toward the outer peripheral surface 46 of the corner 48. At this time, the upper die 51 slides while being pressed against the circular sheet material 60, and the rotary cylinder 56 is slightly extended. By the operation of the pushing cylinder 57, the outer peripheral edge of the circular sheet material 60 is
And the side mold 52 of the fitting mold 47 are pressed and pressurized to form a part of the large-diameter flange 17.

As shown by the solid line in FIG. 13, after forming a part of the large-diameter flange 17, the side die 52 of the fitting die 47 is moved to the outer peripheral surface of the corner 48 by the operation of the pushing cylinder 57. When the fitting mold 47 is rotated upward by the operation of the rotating cylinder 56 as shown by a two-dot chain line in FIG. The state returns to the original state indicated by the solid line 10.
Next, the disk-shaped mold 44 is slightly rotated around the axis 43, and the above procedure is repeated. Thereby, the circular sheet 6 on which the large-diameter flange 17 is formed is obtained.

The order of forming the large-diameter flange 17 and the small-diameter flange 18 may be reversed from that of the above embodiment. That is, the circular sheet material 60 having a flat shape as a whole.
First, the large-diameter flange 17 may be formed into a circular sheet material 35, and the circular sheet 6 may be formed with the small-diameter flange 18 to obtain the circular sheet 6.

[0066]

The effects of the present invention are as follows.

The flexible computer according to the first aspect of the present invention .
The tenor bag is provided with a large-diameter cylindrical sheet, a circular sheet is provided on the same axis as the large-diameter cylindrical sheet, corresponding to an opening at an end of the large-diameter cylindrical sheet, and an outer peripheral edge of the circular sheet is provided. The opening edge of the opening of the large-diameter cylindrical sheet corresponding thereto is heat-welded, a circular hole is formed on the axis of the circular sheet, and the small-diameter cylindrical sheet is formed on the large-diameter cylindrical sheet on the axis. Being arranged side by side, the hole edge of the circular hole and the opening edge of the opening of the small-diameter cylindrical sheet on the large-diameter cylindrical sheet side are heat-welded ,

The above-mentioned circular sheet has a flat annular circular sheet main body, and a short cylindrical large-diameter flange integrally extending in the axial direction from the outer peripheral edge of the circular sheet main body to constitute the outer peripheral edge of the above-mentioned circular sheet. And a short cylindrical small-diameter flange integrally extending in the axial direction from the inner peripheral edge of the circular sheet body to form a hole edge of a circular hole of the circular sheet,
The large-diameter flange and the opening edge of the opening of the large-diameter cylindrical sheet are fitted to each other and thermally welded, and the small-diameter flange and the opening edge of the opening of the small-diameter cylindrical sheet on the large-diameter cylindrical sheet side. Are fitted together and thermally welded, and the following effects are produced.

That is, conventionally, when a flexible container bag is formed, a flat circular sheet and a cylindrical large-diameter cylindrical sheet or a small-diameter cylindrical sheet are brought into surface contact with each other in an attempt to bring them into surface contact. According to the present invention, the opposed portion is formed in a tubular shape so as to make surface contact in advance, so that when these are brought into surface contact, unnecessary bending is unnecessary.

Therefore, since the unnecessary bending as described above is not required, wrinkles are prevented from being generated around the welded portion and each sheet portion in the vicinity thereof, that is, “around the welded portion”. An improved appearance of the flexible container bag is achieved.

Further, since the unnecessary bending as described above is unnecessary, even when the circular sheet is welded to the large-diameter flange or the small-diameter flange, their relative positions are prevented from being shifted from the desired position. Therefore, the assembling accuracy of these components is improved, that is, the dimensional accuracy of the flexible container bag is further improved.

The above method for forming a flexible container bag,

A first mold having an outer peripheral surface in the shape of a truncated cone is located on the same axis as the first mold, and an inner peripheral surface is the first mold.
A second truncated conical shape that can be fitted to and removed from the outer peripheral surface of the mold
A mold is provided, and an annular circular sheet material that is a material for molding the circular sheet is positioned between the first and second molds and on the axis. By fitting the outer peripheral surface and the inner peripheral surface of the second mold, the inner peripheral edge of the circular sheet material is sandwiched between the outer peripheral surface and the inner peripheral surface to form the small-diameter flange.

For this reason, if the first and second dies are relatively moved, the small-diameter flange can be easily formed mechanically, so that the flexible container bag can be easily formed. .

[0075] Further, the small diameter end of the first mold and flat cylindrical shape, the inner peripheral edge of the circular sheet material to enable fitted to press form this small-diameter end portion, from the fitted state, The outer and inner peripheral surfaces of the first and second molds are fitted.

Therefore, prior to forming the small-diameter flange, first, by fitting the inner peripheral edge of a circular sheet material, which is a material of the circular sheet, to the small-diameter end of the first mold, the first The positioning of the circular sheet material with respect to the second mold can be performed with high accuracy.

Therefore, if the first and second molds are relatively moved from the above state, the small-diameter flange is formed with high precision, and as a result, the molding of the flexible container bag becomes easier and Thus, the dimensional accuracy of the flexible container bag is further improved.

According to a second aspect of the present invention, the outer diameter of the small diameter end portion is variable.

For this reason, when there is some variation in the material of the circular sheet material used as the material of the circular sheet, and there is an error in the inner diameter of the circular sheet material, or when the elastic coefficient of the material itself is not constant, the diameter of the circular sheet material may be reduced. If the outer diameter of the small end is adjusted, the elastic fitting force of the inner peripheral edge of the circular sheet material to the small end can be adjusted to a desired size.

Therefore, the positioning of the circular sheet material by fitting the inner peripheral edge of the circular sheet material to the small-diameter end portion can be performed more accurately and more reliably.

According to a third aspect of the present invention, a large-diameter cylindrical sheet is provided.
The large-diameter cylinder is located on the same axis as the large-diameter cylindrical sheet.
A circular sheet is provided corresponding to the opening at the end of the sheet,
The outer peripheral edge of this circular sheet and the corresponding large-diameter cylinder
The opening edge of the sheet opening is heat-welded to the
A circular hole is formed on the axis of the seat, and the large hole is formed on the axis.
A small-diameter cylindrical sheet is arranged side by side
Hole edge and the large-diameter cylindrical sheet side of the small-diameter cylindrical sheet
The opening edge of the opening is heat-welded to

The above-mentioned circular sheet is a flat annular circular sheet .
From the outer peripheral edge of the circular sheet body in the axial direction.
A short length that extends physically and forms the outer periphery of the circular sheet
A cylindrical large-diameter flange and the inner peripheral edge of the circular sheet body
From the circular sheet extending in the axial direction
With a short cylindrical small-diameter flange constituting the hole edge of
Opening edge of the opening of the large-diameter flange and the large-diameter cylindrical sheet
Doo is then fitted so we are thermally welded to each other, and the
The large-diameter cylindrical sheet of the small-diameter flange and the small-diameter cylindrical sheet
The opening edge of the opening on the side of
Of flexible container bags
What

A disk-shaped mold having a vertical axis and substantially the same outer diameter as that of the above-mentioned circular sheet body is provided, and the disk-shaped mold is removably fitted into the corner between the upper surface of the outer edge and the outer peripheral surface. A circular sheet material, which is a material for molding the circular sheet, is placed on the upper surface of the circular sheet material on the same axis as the disk-shaped mold, and the circular sheet material is formed by the fitting mold. Is bent downward, and the outer peripheral edge is pressed against the outer peripheral surface of the disk-shaped mold to form the large-diameter flange.

For this reason, according to the first aspect of the present invention,
In addition to the effects on sibble container bags,
According to the method for forming a flexible container bag , a circular sheet material is placed on the upper surface of the disk-shaped mold on the same axis as the disk-shaped mold, and the fitting mold is fitted to a corner of the disk-shaped mold. By doing so, the large-diameter flange can be easily formed mechanically, and thus the flexible container bag can be easily formed.

[Brief description of the drawings]

FIG. 1 is a partially developed perspective view of a flexible container bag.

FIG. 2 is an overall perspective view and a partially cutaway view of a flexible container bag.

FIG. 3 is a diagram showing a partial cross section of a side surface of a flexible container bag and a heat welding operation.

FIG. 4 is a side sectional view of a device for forming a small-diameter flange.

FIG. 5 is a plan view of an apparatus for forming a small-diameter flange.

FIG. 6 is a side sectional view showing a small-diameter flange during molding.

FIG. 7 is a side sectional view showing a state after forming a small diameter flange.

FIG. 8 is a perspective view of an apparatus for forming a large-diameter flange.

FIG. 9 is a side sectional view of a large diameter flange forming apparatus.

FIG. 10 is a side sectional view showing a state immediately before forming a large-diameter flange.

FIG. 11 is a side sectional view showing the middle of forming a large-diameter flange.

FIG. 12 is a side sectional view showing a state in which a large-diameter flange is formed.

FIG. 13 is a side sectional view showing a state after forming a large-diameter flange.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible container bag 2 Large diameter cylindrical sheet 3 Axis 4 Opening 5 Opening edge 6 Circular sheet 7 Circular hole 8 Small diameter cylindrical sheet 9 Opening 10 Opening edge 11 Product 12 Hanging member 13 Square flange 16 Round sheet body 17 Large diameter flange 18 Small-diameter flange 20 Heat welding device 24 Reference display 26 Small-diameter flange forming device 29 Shaft center 30 First die 31 Outer peripheral surface 33 Second die 34 Inner peripheral surface 35 Circular sheet material 36 Small diameter end 37 Mold main body 41 Large diameter Flange forming device 43 Shaft center 44 Disc-shaped mold 45 Top surface 46 Outer peripheral surface 47 Fitting mold 48 Corner 60 Round sheet material

Continuation of the front page (72) Inventor Toshihide Kajimura 4-8-4 Kigawahigashi, Yodogawa-ku, Osaka-shi, Osaka Taiyo Kogyo Co., Ltd. (56) References JP-A-6-24489 (JP, A) JP-A-6 JP-A 55-48081 (JP, A) JP-A 5-319480 (JP, A) JP-A 55-78194 (JP, U) JP-A 3-47118 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B65D 88/22

Claims (3)

(57) [Claims] 1. A large-diameter cylindrical sheet is provided, and a circular sheet is provided on the same axis as the large-diameter cylindrical sheet corresponding to an opening at an end of the large-diameter cylindrical sheet. And the corresponding opening edge of the opening of the large-diameter cylindrical sheet are heat-welded to form a circular hole on the axis of the circular sheet, and the small-diameter cylindrical sheet is formed on the large-diameter cylindrical sheet on the axis. Are arranged side by side, the hole edge of the circular hole and the opening edge of the opening of the small-diameter cylindrical sheet on the large-diameter cylindrical sheet side are heat-welded, and the circular sheet is a flat annular circular sheet body, A short cylindrical large-diameter flange integrally extending in the axial direction from the outer peripheral edge of the circular sheet main body and constituting the outer peripheral edge of the circular sheet, and integrally extending in the axial direction from the inner peripheral edge of the circular sheet main body. Take out the hole edge of the circular hole of the circular sheet A short cylindrical small-diameter flange to be provided, the large-diameter flange and the opening edge of the opening of the large-diameter cylindrical sheet are fitted together and heat-welded, and the small-diameter flange and the small-diameter cylindrical sheet a the large-diameter cylindrical sheet side of the opening forming method of a flexible container back grayed where the opening edge has been allowed to thermally welded been fitted to each other, the first mold outer peripheral surface forms a truncated cone shape, this A second mold having a frusto-conical shape positioned on the same axis as the first mold and having an inner peripheral surface that is removably fitted to the outer peripheral surface of the first mold; An annular circular sheet material, which is a material for molding the circular sheet, is located between the second molds and on the axis, and from this state, the outer and inner peripheries of the first and second molds. By fitting the surfaces, the inner and outer peripheral surfaces sandwich the inner peripheral edge of the circular sheet material. So as to molding the small diameter flange attach seen, the small-diameter end portion of the upper Symbol first mold and flat cylindrical shape, capable fitted an inner peripheral edge of the circular sheet material to the small diameter end portion in pressure contact shape and then, from this fitted state, the first, outside the second mold, full lexical Bull container bag molding method which is adapted to fit the inner circumferential surface. 2. The method for molding a flexible container bag according to claim 1 , wherein the outer diameter of the small diameter end portion is variable. 3. A large-diameter cylindrical sheet is provided.
Open the end of this large-diameter cylindrical sheet on the same axis as the cylindrical sheet.
A circular sheet is provided corresponding to the mouth.
Opening of the outer peripheral edge and the corresponding opening of the large-diameter cylindrical sheet
The edge is heat-welded to form a circle on the axis of the circular sheet.
A hole is formed, and a small hole is formed in the large-diameter cylindrical sheet on the axis.
Diameter cylindrical sheets are provided side by side, and the hole edge of the circular hole and the small
The opening edge of the opening on the large-diameter cylindrical sheet side of the large-diameter cylindrical sheet;
Is heat-welded so that the circular sheet is a flat annular circular sheet body.
Axially extends from the outer periphery of the circular sheet body
The large diameter of the short cylindrical shape that constitutes the outer peripheral edge of the circular sheet
From the flange and the inner peripheral edge of the circular sheet body in the axial direction
Extends integrally to form the edge of the circular hole of the circular sheet
And a short cylindrical small-diameter flange
The flange and the opening edge of the opening of the large-diameter cylindrical sheet fit each other.
Heat-welded together with the small-diameter flange
And the opening of the small-diameter cylindrical sheet on the large-diameter cylindrical sheet side
The opening edge is fitted to each other and the
A method for forming a kibble container bag, wherein a disc-shaped mold having a vertical axis and substantially the same outer diameter as the circular sheet body is provided, and an upper surface and an outer peripheral surface of an outer edge portion of the disc-shaped mold are provided. Provide a fitting mold that can be detachably attached to the corners of the, and place a circular sheet material that is a molding material of the circular sheet on the upper surface thereof on the same axis as the disk-shaped mold,
By the fitting alloy type with make bent toward the outer peripheral edge of the circular sheet material downward, off the outer peripheral edge was allowed to pressed against the outer peripheral surface of the disc-shaped die so as to mold the large-diameter flange Rekishiburu Container bag molding method.