JPH1191727A - Method for forming quadrangular tubular container made of paper for packaging liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a good bottom seal forming or a good top seal forming for a container without causing distortion of its shape or deviation of seal by removing flatly folded retention and inserting a square cylindrical body into a mandrel smoothly while allowing the square cylindrical body to abut correctly against proper positions of a guide plate and an arm plate when the square cylindrical body (sleeve) is raised from a flat shape to be formed into a solid shape. SOLUTION: This square cylindrical container made of paper for a liquid is formed by a step of removing folded retention, in which two corner parts 1a, 1b are allowed to approach up to a distance less than the diagonal length of the container while the two acute-angled corner parts 1a, 1b only are being held, and in which the flately folded retention of a square cylindrical body 1 is removed by deforming it to a reversely folded flat-shaped square cylindrical body, and a step of raising the square cylindrical body into a solid shape, in which the two corner parts 1a, 1b are allowed to leave each other up to a distance equivalent to the diagonal length to erect the square cylindrical body having a solid shape after the step of removing the folded retention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container which is supplied one by one successively in a step of manufacturing a rectangular cylindrical paper container, which is a container for liquid packaging, with a liquid filling machine. The present invention relates to a method for forming a rectangular tubular container made of liquid packaging paper, wherein the flat rectangular tubular body (sleeve) folded flat is removed and raised and formed.

[0002]

2. Description of the Related Art Square tubular paper containers (cartons) for liquid packaging.
In a filling machine for filling liquid contents into a container, flat rectangular cylinders, each of which is a flat rectangular cylinder (sleeve), which is stacked in a large number before being made into a box, are flattened one by one from a carton magazine portion. Supply, forcibly raise the solid square cylinder by the erecting means, insert it into the mandrel for box making, seal the lower part of the solid square cylinder by bottom seal molding, and mold it as a square cylinder container The liquid content is filled, and the liquid is sealed and filled by forming the upper part of the rectangular cylindrical container with a top seal.

[0003]

However, when the rectangular cylinder forcedly raised from the flat shape to the three-dimensional shape by the raising means is released from the raising means and inserted into the box-making mandrel, The rectangular cylinder tends to return to the flat shape again due to the flat folding habit attached from the beginning.

[0004] Therefore, the raised rectangular cylinder does not accurately contact the correct positions of the guide plate and the arm plate, and when inserted into the box-making mandrel, or when the bottom and the top are molded, the square cylinder is formed. There have been inconveniences that the container cannot be smoothly inserted into the mandrel, or the container to be molded with the bottom seal or the top seal is deformed in shape or misaligned.

According to the present invention, a square cylinder is accurately positioned at the correct position on a guide plate and an arm plate by removing a flat fold when a square cylinder (sleeve) is raised from a flat shape to a three-dimensional shape and formed. The present invention aims to make it possible to smoothly insert the rectangular cylindrical body into the mandrel by contacting the container with the container, and to perform good bottom seal molding and top seal molding without generating shape distortion and seal misalignment in the container.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to an acutely angled two-sided rectangular cylinder of a rectangular cylindrical body 1 which is successively supplied one by one and which is separated from each other in the diagonal direction of the rectangular cylinder. While holding only the corners 1a and 1b, the two corners 1
a) removing the flat fold of the square cylindrical body 1 by bringing a, 1b closer to a distance less than the diagonal length of the rectangular cylindrical liquid paper container and deforming the same into a reversely bent flat cylindrical body; A method of forming a rectangular cylinder container made of liquid packaging paper, comprising: raising the three-dimensional shape into a three-dimensional square cylindrical body by separating the same to a diagonal length equivalent distance after the crease removing step. .

Further, according to the present invention, in the above method, the two corners 1a and 1b are brought close to a distance less than the diagonal length of the rectangular cylindrical liquid paper container to be deformed into a reversely folded flat cylindrical body. Prior to the step of removing the flat fold of the rectangular cylinder 1, the two corners 1 a and 1 b are brought close to a distance corresponding to the diagonal length of the rectangular tubular liquid paper container to form a three-dimensional square cylinder. This is a method for forming a rectangular cylindrical container made of liquid packaging paper, including a temporary standing-up step.

[0008]

According to the method of the present invention, the rectangular cylinder 1 folded flat is held in the diagonal direction by holding only the acute corners 1a and 1b separated from each other in the diagonal direction of the rectangular cylinder. By approaching, the flat rectangular cylinder 1 can be raised in a three-dimensional shape, and can be further folded into the reverse-folded flat rectangular cylinder 1 to remove the flat folding habit, and the three-dimensional standing operation can be performed. It is possible to perform both the folding habit removal operation and the operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for removing standing-up kinks according to the present invention will be described in detail below with reference to FIG.
FIGS. 7A to 7C are perspective views illustrating the order of removing the standing-up kinks of the present invention.

First, as shown in (a), acute square corners of a flat rectangular cylinder 1 (sleeve) supplied one by one from a carton magazine section of a filling machine are separated from each other in a diagonal direction of a rectangular cylinder. Only the parts 1a and 1b are held.

Subsequently, as shown in (b), the two corners 1a and 1b are pressed with a pressing force P and approached to a distance less than the diagonal length of the rectangular cylindrical liquid paper container, so that other The opposite corners 1c and 1d are bent into an acute angle so as to be deformed into a reversely folded flat cylindrical body 1 to remove the flat folding habit of the square cylindrical body 1.

Subsequently, as shown in (c), the pressing force P is released, and the diagonal corners 1a and 1b are separated from each other by a distance corresponding to the diagonal length to stand up in a three-dimensional square cylinder.

Further, the method of the present invention comprises the steps (a) and (b)
In the meantime, the two corners 1a and 1b may be approached to a distance corresponding to the diagonal length of the rectangular cylindrical liquid paper container to temporarily raise the three-dimensional rectangular cylinder.

2 (a) to 2 (c) show the operation when the holding means A and B operate the reverse folding operation for removing the folding habit and the operation of standing up in a three-dimensional shape on the flat rectangular cylinder 1. FIG.

First, as shown in (a), a flat rectangular cylinder 1 supplied one by one from a carton magazine of a filling machine.
The two corners 1a and 1b of the acute angle which are separated from each other in the diagonal direction of the rectangular cylinder are held by holding means A and B, respectively.

Subsequently, one or both of the holding units A and B move in the approaching direction, and the holding units A and B move.
Approach each other to less than the diagonal length of the rectangular cylindrical container while holding the corners 1a and 1b, respectively, and bend the other opposed corners 1c and 1d at an acute angle to reversely fold and flatten. The rectangular cylinder 1 is deformed into a shape, and the flat folding habit of the rectangular cylinder 1 is removed.

Subsequently, one or both of the holding units A and B move in the separating direction, and the holding units A and B move.
Are relatively separated from each other up to the diagonal length of the rectangular cylindrical container while holding the corners 1a and 1b, respectively.
a, 1b and the other opposing corners 1c, 1d are set at right angles to raise the rectangular cylinder 1 in a three-dimensional shape.

In the method of the present invention, at least the diagonal line of the rectangular cylinder 1 to be manufactured is brought close to less than the length of the diagonal line,
The square cylinder 1 having the sharp corners 1a and 1b bent at an acute angle and the other corner corners 1c and 1d at the obtuse angle bent at an acute angle to form a flat cylindrical habit. 1 is reversely folded to remove the kinks. It is appropriate to make the holding means A and the holding means B as close to each other as possible and to fold the corners 1c and 1d as sharply as possible in order to remove the folding habit. The approaching / separating operation of the holding means A and B is 1
It may be repeated once or several times.

[0019]

According to the molding method of the present invention, the distance between the pair of holding means is set to a distance equivalent to the diagonal length of the rectangular cylinder of the container.
Just move to a distance less than the diagonal equivalent length,
A square cylinder that is folded flat can be raised and held in a three-dimensional state, or a square cylinder that is held in a three-dimensional shape can be reverse-folded. It can realize a more accurate erecting operation, and removes the flat fold habit when erecting a square cylinder (sleeve) from a flat shape to a three-dimensional shape, so that the square cylinder can be accurately positioned at the correct position of the guide plate and arm plate. , So that the square cylindrical body can be inserted smoothly into the mandrel, and the bottom and top seals can be molded without causing distortion of the molded shape or seal misalignment in the molded and filled container. There is an effect that can be.

[Brief description of the drawings]

FIGS. 1A to 1C are perspective views showing the order of a molding method according to the present invention.

FIGS. 2A to 2C are plan views showing the operation of the holding means of the molding method of the present invention.

[Explanation of symbols]

A: Holding means B: Holding means 1: Square cylinders 1a, 1b: Sharp corners of a flat folded square cylinder 1c, 1d: Obtuse corners of a flat folded square cylinder 2, 3, 4, 5 … Each side plate of a square cylinder 6… Tube sticking piece

Claims (2)

[Claims] 1. A flat cylindrical container 1 of a rectangular cylindrical liquid paper container which is sequentially supplied one by one and holds only acute corners 1a and 1b which are separated from each other in a diagonal direction of a rectangular cylinder. Meanwhile, the two corners 1a and 1b are approached to a distance less than the diagonal length of the rectangular cylindrical liquid paper container to be deformed into a reversely folded flat rectangular cylinder, thereby reducing the flat folding habit of the square cylindrical body 1. Liquid wrapping paper made by a folding habit removing step of removing and a three-dimensional shape erecting step of erecting a three-dimensional square cylinder by separating from the habit removing step by a distance corresponding to a diagonal length after the crease removing step. A method of forming a rectangular container. 2. The flat folding of the rectangular cylinder 1 by bringing the two corners 1a and 1b closer to a distance less than the diagonal length of the rectangular cylindrical liquid paper container and deforming it into a reverse-folding flat rectangular cylinder. Prior to the step of removing the habit to remove the habit, the two corners 1a and 1b are brought close to a distance corresponding to the diagonal length of the rectangular cylindrical liquid paper container, and temporarily set up in the three-dimensional rectangular cylinder. The method for molding a liquid packaging paper-made rectangular tube container according to claim 1, comprising: