JPH0320108Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rectangular paper container for liquids with a flap top and a flap bottom, and an automatic sealing device. The present invention relates to a temporary folding device for folding paper.

(Prior art) Square-shaped paper containers have traditionally been widely used as packaging containers for liquid beverages such as milk, juice, and alcoholic beverages, and among these, flap-top containers have recently become popular for small quantities because they can be stacked one on top of the other. It's being used.

As a manufacturing device for this type of container, JP-A-57-
As shown in Publication No. 8604, a paper container material with a body attached is opened into a rectangular tube shape, one end is sealed and the ears protruding on both sides are bent and adhesively processed.
Turn it upside down and fill the contents from the upper opening.
An automatic forming, filling, and sealing device has been developed that seals the opening and bends and glues the protruding ears on both sides.

Further, the above-mentioned publication also discloses that temporary folding is performed before the adhesion treatment process.

(Problems to be Solved) However, if the conventional top or bottom part is sealed and molded as shown in the above publication, and corners etc. cannot be reliably bent when forming ears, In the subsequent bonding process, there was a problem in that the bonding position shifted, resulting in a lack of stability.

(Means for Solving the Problems) The present invention solves the above problems, and is a temporary folding method in which the upper or lower ends of a rectangular tube-shaped paper container material are sandwiched in a single character shape to form a lug. The device has molded blades whose tips can be freely opened and closed around a fulcrum, and the other ends of the molded blades are connected to an arm so as to be freely rotatable, and the other end of the arm is rotated by a support plate that moves up and down. freely linked,
The present invention also provides a paper container upper and lower end temporary folding device, characterized in that the device is supported by a spring that is not compressed until the support plate reaches a certain downward pressure.

(Function) When the forming blades are opened and the paper container material is positioned below them and the support plate is lowered, the forming blades close first and pinch the upper end of the paper container material to further support it. As the plate is lowered, the spring is compressed and the forming blades descend and are bent at right angles along the border between the body and the top or bottom, forming the ears accurately. .

(Example) Hereinafter, the temporary folding device of the present invention will be described in detail using a preferred example shown in the drawings.

Figures 3A to 3D show the sequence of forming the top part of the paper container that is the object of the present invention.The container is then turned upside down, and after filling with contents, the bottom part is formed to complete the packaging container. Since the same temporary folding device as the top part can be used for the bottom part, the explanation will be omitted.

That is, the present invention has been developed from the state in which the top forming part a, which is the open upper part of the rectangular tube-shaped paper container material A, is expanded in the longitudinal direction from the state shown in FIG. 3A to the state shown in FIG. This is equipment used for molding.

FIG. 1 is a side view showing one embodiment of the temporary folding device of the present invention, and FIGS. 2A, 2B, and 2C are front explanatory views showing the forming procedure.

This temporary folding device includes a forming blade 2 that can rotate approximately 45 degrees around a vertical line with a support pin 11 as a fulcrum;
2' is provided, and the other ends of the formed blades 2, 2' are connected to two arms 3, 3' via rotatable bearings 4, 4'. The other ends of the arms 3, 3' are connected to one support plate 5 via rotatable bearings 6, 6'. This support plate 5 is connected to a connecting member 9 to a column 8 that is linked to an air cylinder 7 that can move up and down.
The support plate 5 is fixed to the support plate 5 through the air cylinder 7, and the support plate 5 is moved up and down in accordance with the up and down movement of the air cylinder 7.

On the other hand, one end of the support pin 1 is fixed to a sleeve 10 in a vertical direction, and a cylindrical mandrel 11 is provided in this sleeve 10, and the cylindrical mandrel 11 and the sleeve 10 are slidable. A spring 12 is passed below the sleeve 11, and this spring 12 causes the sleeve 10 to
supporting.

Next, the operation of this temporary folding device will be explained. First, the container material A, which is normally in the state shown in FIG. 2A and has the form shown in FIG. When the air cylinder 7 is moved downward, the connected strut 8 and connecting member 9
The support plate 5 is lowered together, and the arms 3 and 3' are also lowered. However, due to the rigidity of the spring 12, the support pin 1 does not move, so the rotatable bearings 4, 4' and , 6', the lower ends of the arms 3, 3' expand to the left and right in a V-shape, and the tips of the molded wings 2, 2' connected to the arms 3, 3' close, and the container material A The upper end seal part b of the top forming part a is sandwiched (FIG. 2B), and the top of the container material A is brought into the state shown in FIG. 3B. When the air cylinder 7 is further lowered, the spring 12 is compressed, and the support column 1 is compressed.
is lowered, the forming blades are lowered in a closed state (FIG. 2C), and the top of the container material A becomes the state shown in FIG. 3C.

Next, when the air cylinder 7 is raised, the forming blades open and return to their original state, and the temporarily folded container material A is transported to the next process such as sealing.

Here, when forming the top part, the container material A is transported while being fitted in a magazine (not shown), etc., as in a normal device, and after the top is formed, it is turned upside down and placed in another magazine. After being stored and filled with the contents, the bottom part is folded using this temporary folding device, and the product is completed through the sealing and ear gluing processes.

(Effects) The temporary folding device of the present invention has the above-mentioned configuration, and in the step before sealing the top portion or the bottom portion, the forming blades close and sandwich the top forming portion as shown above. Since the temporary folding is performed in two stages, in which the forming blade descends and is bent at right angles along the border line between the body and the top or bottom, the corners can be formed reliably.
It has become possible to perform stable work in the process of sealing or gluing the ears.

[Brief explanation of the drawing]

The drawings show an embodiment of the temporary folding device of the present invention, and FIG. 1 is a side view of the temporary folding device, and FIG.
3C is an explanatory diagram showing the operating procedure of the present temporary folding device, and FIGS. 3A, 3B, 3C, and 3 are perspective views showing the order of forming paper containers. A... Paper container material, a... Top forming part, b...
...Top end seal part, c...Ear part, 1...Strut pin,
2, 2'... Molded blade, 3, 3'... Arm, 4,
4'... Rotatable bearing, 5... Support plate, 6, 6'...
... Rotatable bearing, 8 ... Support column, 9 ... Connection member,
10...Sleeve, 11...Cylindrical mandrel, 1
2...Spring.

Claims (1)

[Scope of utility model registration request] A temporary folding device for folding a rectangular cylindrical paper container material, which has a ruled line at a pre-folded part, by sandwiching the upper or lower end of the material in a single character shape and folding it along the ruled line to form an ear part. , has a molded blade whose tip can be opened and closed about a fulcrum, the other end of the molded blade is connected to an arm so as to be freely rotatable, and the other end of the arm is freely rotatably connected to a support plate that moves up and down. A device for temporarily folding an end of a paper container, characterized in that the support plate is supported by a spring that is not compressed until a certain downward pressure of the support plate is reached.