JPH0512214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rectangular parallelepiped container end processing device for forming a bag-like article, which is supplied in a folded state with one end sealed, into a rectangular parallelepiped.

Conventionally, to manufacture a rectangular parallelepiped container such as the one seen in 200ml milk containers, a sheet of paper coated with a heat-sealing material such as polyethylene is continuously folded in half along its length to form a tube. Heat-seal perpendicularly to the longitudinal direction to obtain a bag-like object of an appropriate size, then cut along the heat-sealed line to form a bag-like container with one end closed, and then cut both sides of this container. After opening the inside of the bag-like container while absorbing the liquid by applying a suction cup to the container, it is expanded into a rectangular parallelepiped shape using a molding plate attached to a mandrel, and then press-molded into a rectangular parallelepiped container with one end open, and then filled with liquid contents. This is done using an automatic packaging system that seals and folds the packaging at the end.

However, in this automatic packaging system, various problems arise when opening both sides of the folded bag-like container as described above with a vacuum, and inserting a pair of molding plates into the opening to form the ends into a rectangular shape. For example, there have been problems such as poor molding, contact between the opening of the container and the molding plate, and slippage between the container and the suction cup, resulting in wear of the suction cup.

For example, in the method disclosed in Utility Model Application No. 58-88305, both molded plates are rotated by the same amount to close and open. This is convenient for inserting into the opening, but when the molding plate is expanded, the container is pushed outward, which tends to cause misalignment between the molding plate and the ruled lines that form the shoulder of the container, resulting in poor molding. It causes.

Furthermore, in the device disclosed in JP-A No. 55-143221, one of the pair of molded plates at the front in the rotational direction is fixed, and only the other is movable. Although it is possible to prevent the container from flying out during expansion, the design is complicated and difficult in order to prevent the container opening and the molding plate from touching each other when the container opening is introduced into the molding plate.

This invention has been made in view of the above circumstances, and allows the molded plates to be inserted into the opening of the container without coming into contact with each other, and also allows the container to protrude outward when the molded plates are expanded. An object of the present invention is to provide a rectangular parallelepiped container edge processing device that does not cause molding defects.

That is, the present invention includes a plurality of pairs of molded plates extending in the radial direction and protruding from the outer periphery of the rotating body,
In a rectangular parallelepiped container edge processing device in which the paired shaping plates are introduced through the open end of the bag-like container and the ends of the rectangular parallelepiped container are shaped by the expanding action of the shaping plates, each pair The molding plates each consist of a first molding plate and a second molding plate, each of which is rotatable around its base end, and a pin is protruded near the base end of each. By fitting the pins into respective annular grooves having different eccentric shapes, the inclination of the first molded plate is changed by a smaller angle than the inclination of the second molded plate when the rotating body rotates. The present invention provides a device characterized by the following features.

The present invention will be described below with reference to illustrated embodiments.

The drawing shows the main part of the rectangular parallelepiped container edge processing device according to the present invention, in which a large number of pairs of forming plates are provided radially protruding between a pair of rotating bodies 1. To explain this in more detail, each pair of molding plates includes a first molding plate 3 rotatably provided around an axis 2, and a second molding plate 3 rotatably provided around an axis 4.
It consists of a molded plate 5. A pin 6 is provided protruding near the base end of the first molded plate 3, and is fitted into an annular groove 7 provided eccentrically to prevent the first molded plate 3 from moving when the rotating body 1 rotates. The inclination can be changed as appropriate. A pin 9 is also provided near the base end of the second molded plate 5 and protrudes in the same direction as the pin 6, and is fitted into an annular groove 8 provided eccentrically, so that it The inclination of the second molded plate 5 can be changed as appropriate.

That is, when the pair of molding plates 3 and 5 are in the position (A in the figure) to be inserted into the bag-like container 11 opened by the suction cup 10, the first molding plate 3 is inserted into the bag-shaped container 11 opened by the suction cup 10. The second molding plate 5 is slightly rotated by an angle α (for example, around 1/5 of the rotation angle of the second molding plate 5) toward the plate 5, and the second molding plate 5 closes the gap between the molding plates so that its tip is Annular grooves 7 and 8 are respectively provided so as to be in close contact with the molding plate 3 of No. 1. When the pair of forming plates 3, 5 are in the rectangular parallelepiped forming position (at B in the figure and thereafter until the formed container is discharged), the first and second forming plates 3, 5
are kept expanded by the action of pins 6 and 9. In this case, since the first molding plate 3 has rotated in the closing direction only slightly compared to the second molding plate 5 as described above, the second molding plate 3 is not rotated until it reaches position B. The plate 5 returns to the original expanded state more quickly. Therefore, there is no possibility that the bag-shaped container will be pushed back when the pair of molded plates 3 and 5 are expanded.

When the pair of forming plates 3 and 5 are in the position (C in the figure) for discharging the formed rectangular parallelepiped container, the second forming plate 5 rotates at least slightly toward the first forming plate 3, and the rectangular parallelepiped container 11 is becoming easier to descend. A pair of molded plates 3 and 5 from which the container 11 has been discharged
is returned to position A, and the same operation is repeated.

According to this device, since the molding plate on the rotation direction side (the first molding plate) is rotated slightly in the closing direction, the ideal value of the insertion angle of the container opening into the molding plate (the swing angle of both sides) 1/2) can be placed extremely close to horizontal, which makes the insertion operation easier.
In addition, it is possible to avoid contact between the container and the forming plate, and furthermore, the position of the suction cup (upper surface) can be brought to the center, so there is no slipping on the bag making line, and the problem of wear can be improved. Furthermore, as described above, the problem of poor molding caused by the container popping out when the molding plate is expanded can be solved.

Note that the means for adjusting the inclinations of the first molded plate and the second molded plate is not limited to the above-mentioned combination of pins and eccentric grooves, and other known means may be employed as appropriate.

[Brief explanation of drawings]

The drawing is a side view showing the main parts of the rectangular parallelepiped container edge processing device according to the present invention. In the figure, 1...rotating body, 2...shaft, 3...first molded plate, 4...shaft, 5...second molded plate, 6...
Pin, 7, 8... Annular groove, 9... Pin, 10...
Suction Cup, 11... Bag-like container.

Claims (1)

[Scope of Claims] 1. A rotating body is provided with a plurality of pairs of molded plates extending in a radial direction and protruding from the outer periphery thereof, and the pairs of molded plates are introduced through the open end of a bag-like container, In this rectangular parallelepiped container end processing device that molds a rectangular parallelepiped container by the expanding operation of the molding plates, each pair of molding plates is provided rotatably around the base end of the first molding plate. and a second molded plate, each of which has a protruding pin near its base end, and by fitting these pins into annular grooves of different eccentric shapes, when the rotating body rotates, , the inclination of the first molded plate is set to a second
An end processing device for a rectangular parallelepiped container, characterized in that the angle is changed at a smaller angle than the inclination of the forming plate. 2. A plurality of forming plates forming each pair are provided radially at regular intervals on the outer periphery of the rotating body, and the first forming plate is provided on the rotation direction side of each pair of forming plates. Claim No. 1
The rectangular parallelepiped container edge processing device described in 2.