JPH06538B2 - Method and apparatus for forming a bottom portion on a liquid-filled synthetic resin pillow container - Google Patents

Abstract

1. Process for forming the bottom of a sachet of flexible synthetic material from a cushion (1) of synthetic material filled with liquid, and for imparting stability to it, in which the filled cushion (1) is disposed on a support beam (6) of width less than the width of the cushion in such manner that at least one of the lower corners (7, 8) of the cushion protrudes beyond the beam, tending downwards, characterised in that a gripper (9, 10) is applied to each side of the beam, the exerted pressure force of which gripper expelsthe liquid contained in the said corner or corners, in that welding is effected along at least one line which will impart stability to the sachet, thus forming at least one lug, each corresponding to a corner (7, 8).

Description

Description: FIELD OF THE INVENTION The present invention relates to a method and an apparatus for forming a bottom on a liquid-filled pillow-shaped container made of a flexible synthetic resin.

PRIOR ART One of the problems in the production of flexible synthetic resin pillow-like containers is the stability problem of being able to place the container on a flat surface. It is obtained by processing the bottom of the container into a special shape.

Many techniques for that purpose have been proposed in the past. For example, French patent application No. 75 /
As described in Japanese Patent No. 18358, there is one in which a synthetic resin film is folded to form a W-shaped bottom portion before a container is filled with a liquid. Similarly, French Patent No. 7
The 1/20879 specification proposes shaping the bottom by bending and bending the bottom and then welding and cutting the corners.

Problems to be Solved by the Invention In these conventional techniques, it is necessary that the container is empty. Therefore, a method of processing a container made of a synthetic resin filled with liquid and capable of manufacturing a container having a substantially flat bottom with the same advantages as a W-shaped bottom, and a vertically downward direction from a coil of a long film. It has been desired to realize an apparatus capable of forming a bottom portion in a pillow container that is continuously manufactured.

Means for Solving the Problems A method of forming a bottom portion in a liquid-filled synthetic resin pillow container according to the present invention is to solve the above-mentioned problems by using a synthetic resin-filled pillow container. A method of forming a bottom portion having a predetermined width, wherein the pillow container is placed on a support beam having a width smaller than the width of the pillow container, and at least one lower corner of the pillow container is supported by the support beam. Hanging the side of the beam, pressing the pressing member against the hanging portion to move the liquid in the corner upward, while welding the upper position of the corner linearly, the corner The bottom part is formed in a pillow container made of a synthetic resin filled with a liquid, which is characterized in that it is cut below the welding line.

A method of forming a bottom portion in a liquid-filled synthetic resin pillow container according to the present invention includes placing the liquid-filled pillow container on the support beam and vertically lowering the pillow container downward. It can be carried out by moving to.

A method of forming a bottom portion in a liquid-filled synthetic resin pillow container according to the present invention includes placing the liquid-filled pillow container on the support beam, and filling the pillow container with liquid. In between, the support beam may be raised towards the pillow case.

In order to solve the above-mentioned object, a device for forming a bottom portion on a liquid-filled synthetic resin pillow container according to the present invention is a device for forming a bottom portion of a predetermined width on a synthetic resin liquid-filled pillow container. A supporting beam having a width smaller than the width of the pillow-shaped container, a pair of pressing members located laterally of the supporting beam, a welding head and a cutting member provided on either the supporting beam or the pressing member. At least one lower corner of the pillow-shaped container is hung down to the side of the support beam, and the pressing member is pressed against the hanging portion to move the liquid in the corner upward. The welding head linearly welds the upper position of the corner, and the corner is cut by the cutting blade below the welding line.

An apparatus for forming a bottom portion in a liquid-filled synthetic resin pillow container according to the present invention may be configured such that the welding head and the cutting blade are provided on the pressing member.

An apparatus for forming a bottom portion of a liquid-filled synthetic resin pillow container according to the present invention may have a configuration in which the welding head and the cutting blade are provided on the support beam.

The device for forming the bottom portion of the liquid-filled synthetic resin pillow-shaped container according to the present invention may have the cutting blade provided directly below the welding head.

An apparatus for forming a bottom portion in a liquid-filled synthetic resin pillow-shaped container according to the present invention is characterized in that the supporting beam has a contact surface made of a material softer than the pressing member and located below the cutting blade. It can be configured to have a part.

Embodiments The present invention will be described with reference to the accompanying drawings. In the following description, the case where a molded synthetic resin pillow-shaped container is transferred vertically downward, the method and apparatus of the present invention are, for example, French patent application 80/1 by the present applicant.
The present invention can be applied to the case where the pillow-shaped container as described in the specification of No. 3039 is transferred horizontally, and the present invention is not limited to the mode of this embodiment.

In the figure, 1 is a liquid-filled pillow-shaped container, and this pillow-shaped container 1 is obtained from a long film coil wound around a mandrel by a well-known manufacturing method.
It has 4,5. Such a pillow-shaped container 1 is placed on a support beam 6 having an arbitrary cross section, for example, a square or a trapezoid. The width of the upper surface of the support beam 6 is smaller than the width of the pillow container 1. The length of the support beam 6 (the length in the direction perpendicular to the plane of the drawing) may be any length sufficient to mount the pillow-shaped container 1.

When the pillow-shaped container 1 is transferred vertically, the support beam 6 is arranged immediately below the cutting position from the film coil, and the cut-and-filled pillow-shaped container 1 is dropped from, for example, several cm. It is good to do so. Of course, the support beam 6 may be movable up and down, and the support beam 6 may be raised toward the pillow container 1 in the process of filling the liquid.

Then, as shown in FIG. 1, when the pillow-shaped container 1 containing the liquid 2 is placed on the support beam 6, the two corners 7,
8 is projected and hangs down to the side of the support beam 6 only by the action of gravity.

Next, description will be made with reference to FIG. In the figure, 9 and 10 are pressing members, and these pressing members 9 and 10 are pressing surfaces 11 for pressing the corners 7 and 8 against the support beam 6,
A welding device 12 is provided at the upper end portion, and a cutting blade 13 is provided directly below the welding device 12 so as to be retractable.

Next, a method of forming the bottom of the pillow container 1 using these will be described.

First, the pressing surfaces 11 of the pair of pressing members 9 and 10 are pressed against the side surface of the pillow-shaped container 1 placed on the support beam 6. Then, pressure is applied to the corners 7 and 8 to move the liquid contained in the pillow container 1 toward the upper inside,
Moreover, the corners 7 and 8 are pressed against the side surface of the support beam 6. Then, the welding device 12 pressed against the upper position of the support beam 6 is operated to weld the upper parts of the corners 7 and 8 linearly. At this stage, the pillow-shaped container 1 is formed with two protruding pieces corresponding to the corners 7 and 8.

These protruding pieces may be left as they are, or may be rolled up. In the present embodiment, these projecting pieces cause the cutting blade 13 to project and cut. As a result, a substantially flat bottom portion is formed on the pillow container 1. The width of this bottom is approximately equal to the width of the support beam 6.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the welding head 15 and the cutting blade 16 are built in the support beam 6 '. Therefore, the pressing member 9'only serves to press the corners 7, 8 against the side surface of the support beam 6 '. A contact surface made of a material softer than the supporting beam 6'or the pressing member 9 ', in order to prevent the corners 7 and 8 from being separated from the supporting beam 6'or the pressing member 9'before being welded. 14 are provided on the support beam 6 '. Of course, this contact surface 14 may be provided on the pressing member 9 '.

In any of the examples described above, in order to prevent the liquid that has moved from the corners 7 and 8 from moving downward, the pressing surface 11 of the pressing members 9, 10 and 9 ′ is larger than the corners 7 and 8. It is necessary to be able to press on the entire surface of the parts 7, 8.

In addition, when transferring the pillow-shaped container 1 horizontally,
The support beam may be elongated in the direction perpendicular to the plane of the drawing to guide the passage of a large number of pillow-shaped containers 1 and support the same.

EFFECTS OF THE INVENTION Since the method and the apparatus for forming the bottom portion of the liquid-filled synthetic resin pillow container according to the present invention are as described above, it is easy to use the liquid-filled synthetic resin pillow container. The effect is that a substantially flat bottom can be formed.

[Brief description of drawings]

FIG. 1 shows a pillow-shaped container filled with a liquid placed on a support beam in an embodiment of the present invention.
The figure also shows the operation of sandwiching, welding and cutting the corners of the container, and FIG. 3 shows a sectional view of another embodiment of the present invention. 1 ... Pillow-shaped container, 2 ... Liquid, 3, 4, 5 ... Welding line, 6
... Support beams, 7,8 ... Corners, 9,10 ... Pressing members, 1
DESCRIPTION OF SYMBOLS 1 ... Pressing surface, 12 ... Welding mounting, 13 ... Cutting blade, 14 ... Contact surface, 15 ... Welding head, 16 ... Blade, 6 '... Support beam, 9' ... Pressing member

Claims (8)

[Claims] 1. A method of forming a bottom portion of a predetermined width in a pillow container filled with a liquid made of a synthetic resin, wherein the pillow container is placed on a support beam having a width smaller than the width of the pillow container. Place, at least one lower corner of the pillow-shaped container is hung sideways of the support beam, and a pressing member is pressed against the hanging part to move the liquid in the corner upward, and A method of forming a bottom in a liquid-filled synthetic resin pillow container, which comprises linearly welding an upper position of a corner and cutting the corner below the welding line. 2. A pillow-shaped container filled with the liquid is placed on the support beam by vertically moving the pillow-shaped container downward. A method of forming a bottom portion in a pillow-shaped container made of a synthetic resin filled with the liquid according to 1. 3. The pillow-shaped container filled with the liquid is placed on the support beam by raising the support beam toward the pillow-shaped container while the pillow-shaped container is filled with the liquid. A method for forming a bottom portion on a liquid-filled synthetic resin pillow container according to claim 1. 4. A device for forming a bottom portion of a predetermined width on a pillow-shaped container made of a synthetic resin and filled with a liquid, the support beam having a width smaller than the width of the pillow-shaped container, and a lateral side of the support beam. It consists of a pair of pressing members located, a welding head and a cutting blade provided on either the supporting beam or the pressing member, and hangs at least one lower corner of the pillow-shaped container to the side of the supporting beam. Then, the pressing member is pressed against the hanging portion to move the liquid in the corner upward, and the upper position of the corner is linearly welded by the welding head, and the corner is welded. A device for forming a bottom portion on a liquid-filled synthetic resin pillow container, which is cut by the cutting blade on the lower side. 5. An apparatus for forming a bottom portion on a liquid-filled synthetic resin pillow container according to claim 4, wherein the welding head and the cutting blade are provided on the pressing member. 6. The welding beam and the cutting blade are provided on the support beam as set forth in claim 4.
A device for forming a bottom portion on a pillow-shaped container made of a synthetic resin filled with the liquid according to the item 1. 7. The liquid-filled synthetic resin pillow container according to claim 5, wherein the cutting blade is provided directly below the welding head, and a bottom portion is provided on the container. Forming device. 8. The support beam according to claim 7, wherein the support beam has a contact surface made of a material softer than that of the pressing member at a portion below the cutting blade. A device for forming the bottom of a pillow-shaped container made of synthetic resin filled with the liquid.