JPS6350250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a packaging container having a shape similar to a rectangular parallelepiped.

This type of packaging container is popular for storing fluids such as milk, and is expected to be in great demand because of its simplicity. Therefore, in this type of packaging container manufacturing method, a method is desired that has fewer troubles such as line stoppages, has high productivity, and is easy to automate the manufacturing line.

There is a method described in Japanese Unexamined Patent Publication No. 143221/1983 that can meet these demands to some extent. According to this conventional method, a sheet material is folded in half, the overlapping edges thereof and each fixed size in a direction perpendicular to the transport direction are heat-sealed, and the vicinity of the rear of the heat-sealed portion in the direction perpendicular to the transport direction is cut. This forms a bag-like container into which the contents are poured.

However, according to this method, the number of times of heating and fusing is unnecessarily large to form one bag-like container, and therefore an additional heater needs to be provided.Furthermore, the entire manufacturing process is in a straight line, resulting in a long process. , which is disadvantageous in terms of space.

In addition, since the manufactured rectangular parallelepiped container has a heat-fused portion only on one side wall, it is weak in strength, and in order to increase the size of the container, it is necessary to thicken the sheet material, which is disadvantageous in terms of saving materials. However, the strength of both walls in the vertical direction is unbalanced, which is inconvenient in terms of shape retention when loading a large number of containers. Furthermore, heat-fused portions are formed on both the upper and lower surfaces of the container, resulting in poor appearance of the surface of the container. Furthermore, since the sheet material is cut in the vicinity of the rear of the heat-sealed part that is perpendicular to the conveyance direction, unless this cutting is done with great precision, the opening edge of the unfused part will be left behind the heat-sealed part. This is extremely inconvenient for this type of container, where it is difficult to know in what condition it will be used for drinking. If care is taken to eliminate such opening edges, and if the heat-sealed part is cut at a position forward of the rear edge, the opening of the bag-like container will be blocked, making it impossible to fill the bag with contents. Cutting the rear edge of the heat-fused portion requires precision in a strict sense, which is difficult in practice.

The present invention has been made in view of the above points,
A belt-shaped sheet material having a thermoplastic resin coating on both sides is folded twice so that both edges are polymerized during transportation, and after being heat-fused into a belt shape at regular size intervals in a direction perpendicular to the transportation direction, the fusion is carried out. A substantially rectangular bag-like container with one end open is formed by cutting approximately the center of the bag. This reduces the number of man-hours for heat-sealing and also makes it possible to cut the substantially central portion of the band-shaped heat-sealed portion without requiring much precision. Furthermore, since the cut portions are present on both side walls of the container, an opening at one end and a closed end, which are to be the upper and lower surfaces, are necessarily formed. The bag-shaped container thus formed is transported in the opening side, that is, in a direction perpendicular to the sheet material transport direction, and is expanded from the inside by a container support and transported in the circumferential direction while being maintained in a substantially rectangular parallelepiped shape. After carrying out a predetermined first end treatment to form a box-shaped container with one end open, this box-shaped container is again conveyed in parallel to the conveying direction of the sheet material, a fluid is injected into the interior, and the opening side is further Then, a predetermined second end treatment is performed to produce a sealed box-shaped container. Therefore, the first
The end processing is performed in a substantially perpendicular processing direction as an interruption in the overall substantially linear manufacturing process flow, and the overall process length is greatly shortened. On the other hand, the container manufactured by this method does not have a heat-sealed part on one end surface, and the heat-sealed parts are distributed in a well-balanced manner on both side wall surfaces, increasing the strength. There are no open edges where unsanitary substances can enter and adhere.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In the figure, the manufacturing process of this rectangular parallelepiped-like container includes a step of forming a sheet material into a bag-like container, a step of forming the bag-like container into a rectangular parallelepiped-shaped box-like container with one end open, and a step of forming a liquid into the box-like container. The storage and sealing process involves storing and sealing the container to form an airtight box-like container.

<Bag-shaped container forming process> A belt-shaped sheet material 1 made of paper or the like as a core material and lined on both sides with a thin film made of plastic synthetic resin is guided from a reel 2 by guide rollers 3 provided at appropriate locations, and transferred to a feeding device (not shown). ) and folded into two layers by the press roller 4. This folded sheet material 1
are fused into strips of a predetermined width at regular intervals in a direction perpendicular to the conveyance direction using a heat fusion device 5 (sealed side edge a).
Then, based on a detection signal from a feed position detection device 6 that detects the feed position by applying light from above the sheet material 1, the feed device 7 rapidly feeds the sheet material 1 by a fixed distance intermittently, and at the feeding stop position, the cutter 8 Cut approximately the center of the seal side edge a. As a result, a bag-like container 9 is formed in which only the folded open edge b is open and the other three edges are closed.

Therefore, in the above-mentioned bag-shaped container forming process, it is only necessary to provide the heat-sealing device 5 at one location, and the work of cutting the central part of the sealing side edge a with the cutter 8 is performed by cutting the sealing side edge into a belt-shaped sealing side edge of a predetermined width. As long as it is within the a region, the accuracy may be slightly inferior. There is no gap between the sheet materials 1 at the cut edge of the sealing side edge a, and no unsanitary substances can enter. The opening edge b and the closing edge c are reliably formed by simply folding the sheet material 1, and there is no need to cut the opening edge b to open it.

This bag-like container 9 is attached by a container mounting device 10.
The sheet material 1 is conveyed in the direction of the opening edge b, that is, perpendicular to the conveyance direction of the sheet material 1, and is sent out to be attached to the container support 12 of the container edge processing device 11 that performs a predetermined first edge treatment, and then the next box-shaped container is transported. Entering the molding process.

<Box-shaped container forming process> The container edge treatment device 11 is generally composed of a rotating body called a mandless, and the bag-shaped container 9 is attached to the container edge treatment 11 so that the upper and lower surfaces of the bag-shaped container 9 face each other. After suctioning the suction cups to the upper and lower surfaces, they are separated in the vertical direction and the mouth of the opening edge b of the bag-like container 9 is widened to make it easier to attach, and then the bag-shaped container 9 is placed on the container support 12.

A large number of container supports 12 are arranged at equal intervals in the circumferential direction on the outer periphery of the rotary disk of the container end processing device 11, and a pair of container expanding members 12a, 12b are provided.
The width l of each container expanding member 12a, 12b substantially matches the width of the container to be obtained.

The bag-shaped containers 9 are sequentially attached to the container support 12 by rotating the rotary disk intermittently in synchronization with the conveyance operation.During this attachment operation, the container expanding members 12a and 12b are attached to the tip of the container supporter 12. are close to or in contact with each other so that the side surface shape is tapered into a wedge shape, making it possible to easily and reliably attach the bag-shaped container 9.

After attaching the bag-shaped container 9 to the container support 12,
The bag-shaped container 9 is moved by the rotation of the rotary plate of the container edge processing device 11, and a box-shaped container forming process is started, where a predetermined first edge processing is performed.

That is, at position A, the container expanding members 12a and 12b of the container support 12 are expanded to a position where their outer surfaces are parallel to each other, and the closed edge c side of the bag-like container 9 is pushed open from the inside to form an inverted approximately rectangular parallelepiped shape. It is a box-like container. In this state, the rotary plate continues to be rotated intermittently, and at position B, the end face and both side faces of the closing edge c are pressed by a press forming device to form a rectangular box having ears 13a at the corners. The ridge line of the box is made clear. Then, at the C position, the ears 13a are mutually folded outward by a folding device, and then at the D position, hot air is blown by a hot air heating device to soften the thermoplastic synthetic resin on the surface of the end of the box, and at the E position, press processing is performed. The box-shaped container 13 is formed by attaching the ears 13a to the surface of the box using a synthetic resin softened by the process as an adhesive. At this time, even if the heat-sealed portions on both side surfaces are not attached to the side surfaces, since both edges are configured to cut the center portion of the band-shaped heat-sealed portion, no gap will be created. When moving from the E position to the next F position, the container expanding member 12
a, 12b are changed from the expanded state to the wedge-shaped tapered state to facilitate the separation of the box-shaped container 13 from the container support 12. At the F position, the tip of the container support 12 is directed downward.
The box-shaped container 13 slides down from the container 2 and is stored in a bucket or the like of the fluid storage and container sealing device 14, and the process proceeds to the fluid storage and sealing step.

In the process of forming a box-like container with one end open, a container is formed in the circumferential direction so as to cut into the liquid storage and sealing process, which is provided approximately parallel to the conveying direction of the folded sheet material 1, in a direction approximately perpendicular to the process. Since the box-shaped container is transported, the total length of the process according to the present invention can be shortened, which is advantageous in terms of layout.

<Storing and Sealing Step> In the storing and sealing step of the fluid, a predetermined second end treatment is performed in the transportation step. That is, at the G position, a fluid such as milk is injected into the box-like container 13, and at the H position, both sides of the opening edge b are pushed outward to the left and right, and at the 1st position, the entire area of the opening edge b is heated and fused. The device 16 fuses and seals the box, and presses at the J position to form a substantially rectangular parallelepiped-shaped sealed box having ears 13b at the corners. Furthermore, at the K position, the ear 13b is folded inward, at the L position, hot air is blown to heat and soften the thermoplastic synthetic resin on the surface, and at the M position, the ear 13b is pressed into a box using the softened synthetic resin as an adhesive. A closed box-like container 15 that is attached to the body surface and contains a fluid is completed. The closed box-shaped container 15 that has undergone the second end treatment is sent to the conveyance path for the next step with the side where the ears are not fused as the top surface.

Note that the direction in which the ears are folded in the second end treatment step is not limited to that of this example.
It may be folded by selecting the inside or outside as appropriate. In addition, when storing a box-shaped container with one end open in a bucket or the like to move it to the next process of storing and sealing fluids, a release device can be installed to forcefully transfer the container instead of dropping it under its own weight as in this example. This makes moving work more reliable.

As described above, according to the present invention, the following special effects are achieved.

A In the bag-shaped container forming process, the sheet material is folded twice, heat-fused into strips at regular intervals in a direction perpendicular to the conveyance direction, and the fused portion is cut approximately at the center to form a bag-shaped container. Therefore, one side edge of _each of the two adjacent bag-like containers can be simultaneously formed by one heat-sealing process, and the number of steps for heat-sealing can be reduced. In addition, the number of bases can be reduced by using a single heat fusing device.

_a2 Since it is sufficient to cut approximately the center of the heat-fused portion as long as it does not exceed the width of the heat-fused portion, precision in a strict sense is not required for position control for cutting. In this way, even if the precision of the position control is not strict, an opening is always formed at the overlapping edge of the two-folded sheet material, and a closed edge is certainly formed at the folded edge. Therefore, there is no need to control the sheet material feeding device for cutting with a high degree of precision, and the device can be simplified and cost-effective.

a ₃ By cutting the heat-fused part, the side edges of the bag-like container are completely sealed, so there is no possibility of unsanitary substances getting in or adhering to the side edges due to dripping when filling the contents, and this type of container is It does not impede the required hygiene.

B. The box-shaped container forming process is interposed in a manner that is approximately perpendicular to the transport direction that is substantially parallel to the bag-shaped container forming process that is the preceding process and the airtight box-shaped container forming process that is the subsequent process. , the overall process length can be shortened, the heating and fusing means can be simplified, and the apparatus can be downsized.

C The rectangular parallelepiped-like container manufactured according to the present invention has well-balanced heat-fused portions formed on both side walls, and no such welded portion on one end wall, so c ₁ side wall strength is strengthened in a well-balanced manner, making it possible to carry multiple loads. Even in such a case, the shape of the container is well maintained, and there is no need to increase the thickness of the sheet material as the container becomes larger, so materials can be saved.

_c2 The heat-sealed edges that appear on the side walls are securely sealed and there are no gaps, so there is no need to worry about unsanitary conditions.

c ₃ Since there is no fused part on one end wall, the appearance of the printing on the container surface improves.

[Brief explanation of drawings]

The drawings are simplified manufacturing process diagrams showing one embodiment of the method for manufacturing a rectangular parallelepiped-like container according to the present invention. DESCRIPTION OF SYMBOLS 1... Sheet material, 5... Heat fusion device, 6... Feed position detection device, 8... Cutter, 9... Bag-shaped container, a...
Sealing side edge, b...Opening edge, c...Closing edge, 11...Container end processing device, 12...Container support, 12a, 12
b... Container expansion member, 13... Box-shaped container, 14... Fluid storage and container sealing device, 15... Sealed box-shaped container,
16... Heat fusing device.

Claims (1)

[Claims] 1 A belt-shaped sheet material coated with a thermoplastic synthetic resin film on both sides was folded twice so that both edges overlapped during transportation, and heat-fused into a belt shape at regular size intervals in a direction perpendicular to the transportation direction. Afterwards, a substantially rectangular bag-like container with one end open is formed by cutting the approximately central part of the fused portion, and the bag-like container is transferred in the direction of the opening, covered with a container support, and moved in the circumferential direction. During the transportation, the bag-like container is expanded from the inside, held in a substantially rectangular parallelepiped shape, and the opposite end surface and both side surfaces are processed to form a box-like container with one end open. removing the container from the container support and transporting it again substantially parallel to the transport direction of the sheet material with the open end side facing upward;
After the fluid is injected during the transportation, both ends of the opening edge are pulled outward in opposite directions, the entire opening edge is heated and fused in a straight line, and the edges are treated to produce a sealed box-like container in which the fluid is stored. A method for manufacturing a rectangular parallelepiped-like container, characterized by: