JPH0450104Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an apparatus for forming a rectangular bag-like container made from a sheet material based on paper or plastic into a rectangular box-like container. .

[Conventional technology]

BACKGROUND ART Conventionally, box-shaped containers, bag-shaped containers, etc. formed from sheet materials based on paper, plastic, etc. have been frequently used for packaging fluid foods such as milk and youth. As a liquid packaging device using these containers,
A strip-shaped sheet material having heat-adhesive resin coating on both sides is unrolled from the raw roll, this strip-shaped sheet material is folded in half in the longitudinal direction, and is sealed laterally at an appropriate interval in the longitudinal direction. By cutting the sheet material in the transverse direction and separating it, a bag-like container with one end open is formed, and the bag-like container is formed into a box shape, and then the container is filled with contents.
A device for sealing is known (Japanese Patent Laid-Open No. 1983-
No. 204424, JP-A-61-81905).

In the apparatus disclosed in the above publication, in order to form a flat bag-like container into a box-like container, the bag-like container is placed over the tips of a pair of claws that can be opened and closed.
By opening this claw, the body of the bag-like container is expanded into a box-like shape, and the tip thereof is pressed with a press member to form a flat shape.

[Problem that the invention attempts to solve]

However, if the bag-like container is opened from the inside by simply opening a pair of claws placed inside the bag-like container, it is not possible to correctly bend each corner of the box-like container body at right angles. However, there was a problem in that it had a rounded, box-like shape and had a poor appearance.

The present invention has been made in view of the above problems, and aims to provide a molding device that can mold a bag-like container into a box-like container with a good external shape in which each corner is bent at right angles. purpose.

[Means for solving problems]

The present invention, which has been made to achieve the above object, consists of a mandrel consisting of a pair of claws that hold a substantially rectangular bag-like container with one end open and which expands from the inside, and an integrated body arranged to sandwich the mandrel. and a drive device for pressing the side press member against a mandrel, the side press member comprising:
The object of the present invention is to provide a container forming apparatus, which has a press plate made of an elastic material on the side facing the mandrel, and has a groove on the back surface at a position where the press plate contacts the corner of the mandrel.

[Effect]

In the apparatus configured as described above, the bag-like container is placed over the mandrel with the pair of claws closed, and the bag-like container is expanded from the inside by opening the pair of claws. Next, a pair of side press members are pressed against the mandrel from the sides of the mandrel, the container is pressed against the corner of the mandrel, and the corner of the container is bent.
At this time, a press plate made of an elastic material on the inner surface of the side press member comes into contact with the container and is pressed against the mandrel by the press plate, but the press plate has grooves on the back surface of the part corresponding to the corner of the mandrel. So,
The press plate in this area is easily deformed, so even if the press plate is pressed against the mandrel from one direction, the press plate deforms and comes into pressure contact with the side and end faces that make up the corners of the mandrel, causing the container to close. It is possible to bend it at right angles by pressing it strongly against the corner of the mandrel.

〔Example〕

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

FIG. 4 is a perspective view schematically showing a liquid packaging device equipped with a container forming device according to an embodiment of the present invention. In the figure, 1 is a strip-shaped sheet material whose base material is paper and has thermoplastic resin coating on both sides, 2 is a raw roll made by winding up the strip-shaped sheet material, 3 is a guide roller, 4 is a straw hole punching device, and 5 6 is a pull tab tape pasting device, 6 is a pull tab tape winding device,
7 is a date printing device, 8 is a ruled line pressing device, 9 is a first constant dimension feed drive roller that intermittently conveys the belt-shaped sheet material by a predetermined amount, 10 is a dancer roller for tension adjustment, 11 is a germicidal lamp, and 12 is a Sheet folding device for folding strip-shaped sheet material into two,
13 is a sealing device for laterally sealing the belt-shaped sheet material 1 folded in half to form a sealed portion 14;
Reference numeral 15 denotes a direction change roller; 16 a second fixed-size feed drive roller that intermittently conveys the belt-shaped sheet material by a predetermined amount; and 17 a cutting device that cuts off the tip of the belt-shaped sheet material as a bag-shaped container 18.

20 is a molding device according to an embodiment of the present invention for expanding the bag-like container 18 and forming it into a box-like container. The rotary disk 22 is equipped with a rotating disk 22, and forming means (not shown) arranged around the rotating disk 22. Details of these will be described later.
Reference numeral 24 denotes a container conveying device formed by endlessly connecting U-shaped carriers 25 that hold box-shaped containers 18, and is configured to be driven intermittently in the direction of the arrow. S1 to S12 indicate stations that perform predetermined processing on the containers held in the carrier 25 of the container transport device 24, and each station is provided with means for performing predetermined processing, respectively. Illustration is omitted. The details of the processing will be described later. 26 is a discharge conveyor.

FIG. 2 is a schematic side sectional view showing an enlarged view of the molding device 20 provided in the above device. In the same figure, the molding device 20 has a rotary disk 22 equipped with a plurality of mandrels 21 radially, as described above, and each mandrel 21 is moved one pitch at a time in the direction of the arrow as shown in the figure on this rotary disk 22. A drive device is connected to the drive device for intermittent rotation so as to move intermittently.
The illustrated positions of each mandrel 21 are operating positions for performing a predetermined operation on the container 18 held by the mandrel, and for convenience, the stopping positions of the mandrel 21 are referred to as P1 to P8. The mandrel 21 is formed of a pair of plate-shaped claws 21A, 21A that can be opened and closed.
It is installed so that it opens and closes in the direction of rotation.
Inside the rotary disk 22, as the rotary disk 22 rotates, a pair of claws 21A, 21A are opened so that their outer surfaces become parallel (positions P3 to P7), and closed so that they become narrower toward the tip. Means (not shown) is provided for this purpose. A pair of claws 21A,
The dimensions and shape of 21A are determined so as to substantially match the inner surface shape of the box-like container 18 when it is in the open state as shown at positions P3 to P7.

Position P1 is a position where the bag-like container 18 cut off by the cutting device 17 shown in FIG. ing. At position P2, a pushing member 30 for pushing the bag-shaped container 18 to a predetermined position relative to the mandrel 21 and an air cylinder 31 for driving the pushing member 30 are arranged on an extension of the mandrel 21. Guide plates 33 and 34 are arranged on both sides of the movement position of the mandrel 21 from position P2 to position P3. These guide plates 33 and 34 are connected to the mandrel 21
The bag-like containers 18 are arranged at intervals slightly larger than the width of the mandrel 21 on both sides of the running position of the
While opening the mandrel 21 equipped with
When moving, it comes into contact with both ends of the container 18 and presses it inward, that is, toward the sides of the mandrel 21, thereby helping to expand the container 18 and form it into a rectangular shape.

Positions P3 and P4 are opposite to the opening of the bag-like container 18, that is, positions for forming the container head into a box shape, and are used for press members 37 and 38 pressed against the tip of the mandrel 21 and for driving them, respectively. Air cylinders 39 and 40 are provided. Further, at position P3, a pedestal (not shown) is arranged on both sides of the tip of the mandrel 21, and a triangular flap 18 protruding on both sides of the container head is placed between it and the press member 37.
B (see Figure 3B) can be folded flat. Similarly, at position P4, an inclined pedestal 46 is provided on both sides of the tip of the mandrel 21, and a triangular flap 18B is sandwiched between the mandrel 21 and the press member 38, and the triangular flap 18B is bent in the direction approaching the container body. It is now possible to attach Note that the lower surface of the press member 38 at this position has a flat surface that is pressed against the tip of the mandrel 21 and an inclined surface that contacts the inclined pedestal 46 on both sides thereof.

Position P5 is a position for bending the four corners of the body of the container 18 held by the mandrel 21 at right angles to form the body into a box shape. At this position, a pair of side press members 50 are provided on both sides of the mandrel 21 so that they can be pressed against the mandrel 21. 1A and 1B illustrate this side press member 50 in detail, and the side press member 50 is movably held by a bracket 51, and is pressed against the mandrel 21 and released from the mandrel. It is connected to a drive device (not shown) that reciprocates in this manner. Note that instead of this, the pair of side press members 50 may be held by swing levers that swing toward and away from each other, and the side press members 50 are pressed against the side surface of the mandrel 21 by the swing of the swing levers. good. A press plate 52 made of an elastic material such as rubber is attached to the side of the side press member 50 facing the mandrel 21. This press plate 52 has a groove 53 formed on the back surface at a position opposite to the corner of the mandrel 21, forming a thin wall portion 52A.

In FIG. 2, a guide 54 is provided along the running position of the triangular flap of the container 18 held on the mandrel 21 from position P4 to position P7. This guide 54 is located at a position P4 while the container 18 is held by the mandrel 21 and passes through.
This acts to press the bent triangular flap 18B against the body of the container 18.

Position P7 is the take-out position of the box-shaped container 18 that has finished forming.
A letter-shaped carrier 25 is waiting. Note that this carrier 25 is also intermittently driven in the direction of the arrow.

Next, the operation of the molding apparatus 20 having the above configuration will be explained. At position P1, the bag-like container 18 is attached to the tip of the mandrel 21. This bag-shaped container 1
8 has seal portions 18 on both sides as shown in FIG. 3A.
It has a rectangular shape with A. Due to the intermittent rotation of the rotary disk 22, the container 18 held by the mandrel 21 is then moved to position P2, and the pushing member 3
0 into a predetermined position relative to the mandrel 21. Next, the mandrel 21 moves from position P2 to position P3, but at this time the mandrel 21
A pair of claws 21A, 21A forming the bag open to open the bag-like container 18 from inside into a box shape, and at the same time, both ends of the bag-like container 18 are pressed inward by the guide plate 33.
The bag-like container 18 is expanded into a box shape. Also,
At the same time, the seal portions 18A on both sides of the container are attached to the guide plate 3.
3, it is bent backward in the direction of container movement and pressed against the side of the box-shaped container. At the position P3, the press member 37 descends, so that the tip of the container 18 is flattened and has a shape as shown in FIG. 3B. However, in this case, even though the corner 18C of the container body has been provided with a crease line, it has not yet been bent at a right angle, so it does not have an accurate rectangular shape, and the entire corner has a rounded shape. It has a similar shape. Thereafter, at position P4, the triangular flaps 18B on both sides are bent inward by the press member 38 to form a curl.

This container 18 is then sent to position P5. In this position, as shown in FIGS. 1A and 1B, the pair of side press members 50 move toward the mandrel 21 from the sides of the mandrel 21, and the press plate 52 presses the body of the container 18 on each side of the mandrel 21. Claw 2
Press it against the corner of 1A. At this time, since the thin wall portion 52A of the press plate 52 is easily bent, the mandrel 21
When pressed against the corner of the container 18, it deforms greatly and the container 18
The body of the container 1 can be firmly pressed against both sides (side and end surfaces) of the corner of the mandrel.
8 can be bent at right angles.
In this way, the container 18 is formed into a rectangular shape with the corners 18C bent at right angles, as shown in FIG. 3B. Thereafter, the container 18 is discharged from position P7 to the carrier 25 waiting below.

Next, the operation of the liquid packaging device equipped with the molding device 20 having the above structure will be explained. In FIG. 4, a belt-shaped sheet material 1 is unwound from a raw roll 2 and is intermittently fed by a fixed length by a first fixed length feed drive roller 9. As shown in FIG. On the way, various processes are applied to the belt-shaped sheet material 1 while it is stopped. That is, first, a straw hole is made in the strip-shaped sheet material 1 from the inner surface side of the strip-shaped sheet material 1 by the straw hole punching device 4, and a pull-tab tape is pasted on the outer surface of the straw hole by the pull-tab tape pasting device 5. The band-shaped sheet material 1 to which the pretab tape has been pasted is then printed with a date by a date printing device 7, and then printed by a ruled line pressing device 8.
A ruled line is formed. These ruled lines form folds when forming a box-like container.

Band-shaped sheet material 1 that has passed the first drive roller 9
is intermittently fed by a fixed length by the second drive roller 16. At this time, the fixed-dimension feeding by the first drive roller 9 and the fixed-dimension feeding by the second driving roller 16 are theoretically performed at the same timing, but in reality they may be slightly deviated due to elongation of the belt-shaped sheet material, etc. Since the dancer roller 10 is interposed between the two, the vertical movement of the dancer roller 10 absorbs errors caused by the intermittent feeding caused by both drive rollers. Band-shaped sheet material 1 that has passed the dancer roller 10
The inner surface of the sheet is first sterilized by a germicidal lamp 11, then folded in half by a sheet folding device 12, laterally sealed at predetermined intervals by a sealing device 13, turned horizontally by a direction changing roller 15, and cut. The device 17 cuts the seal portion 14 in the center and separates it. As a result, as shown in FIG. 3A, a bag-like container 1 having seal portions 18A at both ends, a straw hole 60, and a pull tab tape 61 pasted thereon.
8 is formed.

Next, this bag-like container 18 is placed on the mandrel 21 of the molding device 20, and while rotating together with the mandrel 21, it is expanded, the end opposite to the opening is molded flat, and then the body is made into a rectangular shape. It is molded into a box-like container 18 as shown in FIG. 3B.
The shaped box-shaped container 18 is transferred from the mandrel 21 to a carrier 25 located at station S1.

While the box-shaped container 18 held by the carrier 25 is held by the carrier 25 and travels intermittently, it is pushed into a predetermined position relative to the carrier 25 at a station S2, filled with contents at a station S3, and the upper part is removed at a sauté station S4. The opening is formed into a shape to close it, i.e., each fold is creased, the upper opening is sealed at stations S5 and S6, and the upper end is formed flat and the upper and lower triangular flaps are formed at stations S7 and S8. is bent upward, the resin on the inner surface of the triangular flap and the outer surface of the container to be joined to it is heated and melted at station S9, and each triangular flap is pressed and attached to the outer surface of the container at station S10.
The top and both sides of the container 18 are pressed at the station S11 to shape the entire container into a rectangular shape, and the container is discharged onto the discharge conveyor 26 at the station S12.

The containers placed on the discharge conveyor 26 are sent to a subsequent process, and are manufactured into products through processes such as sterilization and packaging.

In addition, in the above embodiment, the molding apparatus 20 of the present invention
is installed in a liquid packaging device that manufactures a box-shaped container from a strip-shaped sheet material based on paper, fills it with liquid, and seals it. However, the present invention is not limited to this case. It goes without saying that it can be used anywhere where a container is formed into a box shape.

[Effect of idea]

As explained above, the molding device of the present invention is
A side press member having a press plate made of an elastic body is configured to press a mandrel holding a bag-like container in an expanded state from both sides thereof, and a position where the press plate contacts a corner of the mandrel. Since a groove is provided on the back side of the container, simply by pressing this side press member against the mandrel, the container body can be pressed against the corner of the mandrel, and the container corner can be bent at right angles to match the mandrel corner. This has the effect that it can be formed into a box-like container with right-angled corners.

[Brief explanation of the drawing]

Figures 1A and 1B show the main parts of an embodiment of the present invention, and Figure 2 shows a cross section taken along the - arrow in different operating states, and Figure 2 is an embodiment of the present invention. FIG. 3A is a perspective view showing a bag-like container before being molded by the molding device; FIG. 3B is a perspective view showing the box-like container after molding; FIG. 4 is a schematic cross-sectional view showing the molding device. 1 is a schematic perspective view showing a liquid packaging device equipped with a liquid packaging device. 18... Bag-shaped container (box-shaped container), 20... Molding device, 21... Mandrel, 21A... Claw, 50
... Side press member, 51 ... Bracket, 52
...Press plate, 52A...Thin wall portion, 53...Groove.

Claims (1)

[Scope of utility model registration request] a mandrel consisting of a pair of claws that holds a substantially rectangular bag-like container with one end open and expands from the inside;
A press plate comprising an integral side press member arranged to sandwich the mandrel and a drive device for pressing the side press member against the mandrel, the side press member being made of an elastic body on the side facing the mandrel. 1. A container forming apparatus having a press plate having a groove on the back surface at a position where the press plate contacts a corner of the mandrel.