JPH1029606A - Packaging method for corrugated plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save time and labor, and shorten the working time for a packaging by a method wherein a plurality of stacked corrugated plates, are heat-sealed with two sheets of heat shrinkable films from the top and the bottom, both directions, and after cutting and heat-shrinking the films, the films are pressed and tightly joined to the corrugated plates. SOLUTION: Stacked corrugated plates 5 are carried by a first conveyor 1. The carried corrugated plates 5 are pinched and packaged with two sheets of heat shrinkable films which are fed from film rolls 7, 8 and stretched after heat-sealed and connected, from the leading ends. The packaged corrugated plates 5 are automatically heat-sealed by pressing the films to a pedestal 12 when the corrugated plates 5 are transferred to a second conveyor 2 and pass under a seal bar 11. The heat-sealed films are cut, and the corrugated plates 5 are packaged into a sleeve type of which one edge in the width direction, is not sealed. Then, the corrugated plates 5 pass through a heating oven 3, and the films heat-shrink and are tightly joined to the corrugated plates 5. In addition, the film parts which are not joined of the corrugated plates 5, are pressed and welded by a joining member 14, in front of a third conveyor 4, and a series of packaging works is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for packing a corrugated sheet used as a building material, and more particularly, to a reduction in work time and labor required for packing, and an improvement in workability and convenience at the time of opening a packed product. And a method of packing corrugated sheets.

[0002]

2. Description of the Related Art In general, a corrugated sheet is packaged by bundling a plurality of sheets as one unit with a band made of synthetic resin, or wrapping it with a film or cardboard made of synthetic resin. An example of a method of packing a corrugated sheet will be described with reference to FIG. 3. A plurality of stacked corrugated sheets 17 are wrapped by a transparent synthetic resin film 18 cut according to the length and width of the corrugated sheet (procedure). 1). In order to easily confirm the corrugated plate 17 visually, a transparent polyethylene film or the like is used as the synthetic resin film. Next, after overlapping both ends of the synthetic resin film at a position on the center line of the corrugated sheet, the overlapped portion is bonded with an adhesive tape 19 cut to an appropriate length to form the film into a sleeve (sleeve) type. (Step 2).
For the same purpose as in the case of the synthetic resin film, a transparent cellulose tape or the like is used as the adhesive tape. Next, the upper central portion of both ends of the formed sleeve portion is pushed into the lower part of the corrugated plate to form a trapezoidal bonding margin (step 3). Then, this bonding margin is folded back on the corrugated sheet (procedure 4), and is fixed by sticking with an adhesive tape (procedure 5), and a series of packing operations is completed. On the other hand, the opening operation is performed in the reverse order of the packing procedure. That is, the adhesive tapes attached around the both ends in the length direction of the corrugated sheet are peeled off, and the state is returned to the sleeve type shown in the procedure 2. Next, the adhesive tape adhered in the length direction of the corrugated sheet is peeled off, and the package is completely opened to be opened.

[0003]

However, the conventional method of packing corrugated sheets has the following problems. 1) Since the conventional method is often performed entirely or partially manually, it requires time and effort. Therefore, it is necessary to increase the number of personnel in order to reduce the time required for packing. 2) The finish of the package differs depending on the skill of the operator, such as failure to cut a synthetic resin film or adhesive tape used for the packaging, or a wrong packaging procedure. 3) When the size of the corrugated sheet to be packed is particularly large, workability is poor, and time and labor are required. 4) When the package is completely opened, it is necessary to cut the package using a tool such as scissors or to remove all the adhesive tapes, and the workability is poor. 5) When extracting some of the packed corrugated sheets, it is necessary to remove the adhesive tape stuck in both the length direction and the width direction, or cut the package to make it completely open. There is. In the conventional method, since the synthetic resin film is folded and tailored into an envelope shape, a fold occurs due to packing. Therefore, even if only the adhesive tape stuck in the width direction of the corrugated sheet is removed and the corrugated sheet is returned to the sleeve type, the corrugated sheet is caught in the fold when the corrugated sheet is pulled out, and cannot be easily pulled out. 6) If the corrugated sheet is left unattended for a long time after opening the package, the corrugated sheet is loosely wrapped in the synthetic resin film. The present invention
An object of the present invention is to provide a new corrugated board packing method which overcomes these problems.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve the above-mentioned object, and as a result, have found that shrink wrapping, which is often used for packaging small products such as processed foods, is corrugated. It has been found that a packing method that continuously performs the packing process for this purpose is suitable for this purpose. That is, the packing method of the corrugated sheet according to the present invention transports a plurality of corrugated sheets stacked on a conveyor, and sandwiches the corrugated sheet between two heat-shrinkable films supplied from both upper and lower directions. The two films are heat-sealed and cut at the rear thereof, guided in a heating furnace to thermally shrink the films, and then the films on both sides of the corrugated sheet are pressed and adhered by rolls.

[0005]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a schematic explanatory view illustrating steps of a method of packing a corrugated sheet according to the present invention, and FIG. 2 is a schematic explanatory view illustrating a packing form of a corrugated sheet according to the present invention. First, when carrying out the present invention, each device constituting the present invention is installed as illustrated in FIG.
That is, the first conveyor 1 is provided at the forefront (the left end in FIG. 1), the second conveyor 2 is provided at the rear, the heating furnace 3 is provided at the rear, and the third conveyor 4 is provided at the rear. Above and below the first conveyor 1, a film roll 7 around which a heat-shrinkable film 6 (hereinafter simply referred to as "film") having a width slightly larger than the width of the corrugated sheet 5 to be packed is wound. , 8 are installed one by one. In addition, each one of the film rolls 7 and 8 is provided in a direction of the first conveyor and in an upper part and a lower part in the vicinity of the rear part of the first conveyor.
The book film guide rolls 9, 9 ', 10 and 10' are attached. Further, a seal bar 11 and a pedestal 12 (hereinafter, referred to as a “heat sealer”) are mounted in front of the second conveyor 2, and one free roll 13 is installed diagonally above the seal bar. .

Further, the film 6 wound on the upper film roll 7 is sent to the vicinity of the corrugated plate by the film guide roll 9 attached near the film roll, and the film guide roll 10 and the free roll 13 near the rear of the first conveyor are moved. In a screen-like state. On the other hand, similarly, the film 6 wound around the lower film roll 8 is also a film guide roll 9 'near the film roll.
, And is sent upward through a film guide roll 10 'near the rear of the first conveyor. Then, the two films sent from the film rolls 7 and 8 are heat-sealed and connected by a heat sealer, and are prepared in advance in a screen-like state as shown by a dashed line in FIG. Is the initial state. In addition, a fusing member 14 is provided at the front of the third conveyor 4.

After installing each of the above-mentioned devices at a predetermined position and setting it in an initial state, the corrugated sheet is continuously packed by the following steps. First, the stacked corrugated sheets 5 are placed on the first conveyor 1 such that the direction of the center line of the corrugated sheet (the width direction when viewed from the front end) and the transport direction (the direction of the arrow in FIG. 1) are parallel. And transported. The first conveyor may be any type of conveyor, such as a belt, a net or a roller, as long as the corrugated sheet is not damaged.The conveyor in the heating furnace is preferably a net-shaped conveyor having excellent heat resistance. The same applies to the conveyor. The corrugated sheet conveyed by the first conveyor 1 is automatically pinched and packaged from the front end by a film stretched in a front screen shape (procedure 1 in FIG. 2). At this time, it is preferable to attach a position detecting sensor to the edge portion of the film so that the film is wrapped straight along the center line direction of the corrugated sheet. Thereby, the positions of the film rolls 7 and 8 are adjusted, and meandering of the film can be prevented. As the film, a uniaxially or biaxially stretched transparent synthetic resin film having a thickness of several tens to several hundreds of μm is used. A uniaxially stretched film shrinks only vertically at a certain temperature or higher, while a biaxially stretched film shrinks at an almost equal ratio of length and width. It depends on the material and physical properties of the film,
The shrinkage rate is several tens%. As the material, polyethylene, polypropylene, polystyrene, vinyl chloride resin, vinylidene chloride resin, etc., which are relatively excellent in strength and inexpensive, are suitable.

The corrugated sheet sandwiched and packaged by the film passes through the seal bar 11 and moves to the second conveyor 2.
When the corrugated sheet passes under the seal bar, the seal bar automatically descends, pressing the film against the pedestal 12 and heat sealing. The seal bar is composed of a nichrome wire and its support. The nichrome wire heats the film and heat seals the film by pressing the film against the pedestal 12 for a certain period of time. The pedestal 1
Reference numeral 2 comprises a Teflon tape and a silicone rubber. The Teflon tape helps the film to slide, and the silicone rubber having excellent heat resistance plays a role of a buffer.

Since the heat-sealed film is pulled in the conveying direction by the conveyance of the corrugated sheet, it is cut at the position of the heat sealer. As a result, the corrugated sheet is packaged in a sleeve type whose width direction is not sealed (procedure 2 in FIG. 2). The two film guide rolls 10 near the rear of the first conveyer serve to return the film heat-sealed and cut by the seal bar 11 to a position just before the heat sealer. As a result, the tip of the conveyed corrugated sheet always comes into contact with the connection portion between the upper and lower two films. The free roll 13 is a seal bar 1
When the film 1 heat seals and cuts the film, it descends by its own weight, returns the film to a position before the heat sealer, and keeps the film tension constant.

Next, the corrugated sheet packaged in the sleeve type is conveyed to the heating furnace 3 where it is heated. The heating furnace 3 is a device for heating by applying hot air while conveying the corrugated sheet by the conveyor. The heating furnace interior is 100 ~ depending on the film material etc.
The conveying speed is set to a range of 200 ° C., and the conveying speed is set such that the sheet can pass in a few seconds in order to avoid an adverse effect on the corrugated sheet due to excessive heating. By passing through the heating furnace, the film thermally contracts and adheres to the corrugated sheet. Further, the upper and lower sides of the film are brought into close contact with each other by heating (procedure 3 in FIG. 2). This state is called blocking, and the upper and lower films are hardly peeled off.

The corrugated sheet that has passed through the heating furnace 3 is the third conveyor 4
Go to As shown in FIG. 1, a contact member 14 is attached to a front portion of the third conveyor 4. Close contact member 14
Consists of a roll and spring mechanism. The spring mechanism is provided on a support portion of the roll, and the roll is pressed against the third conveyor by the spring mechanism. Then, the roll rotates while following the conveyance of the package of the corrugated sheet, and presses and fuses the film portion not in close contact with the corrugated sheet with an appropriate pressure. The packing is thus prepared, and a series of packing operations is completed (procedure 4 in FIG. 2). Note that a silicone rubber or the like having excellent heat resistance is used as a material for the roll.

[0012]

Next, the present invention will be described in more detail with reference to examples. Note that the present invention is not limited to the following embodiments.

A stack of ten corrugated sheets 655 mm in width and 1820 mm in length was placed on the first conveyor of the apparatus shown in FIG. 1 and transported at a rate of about 5 m / min. Behind the first conveyor, the leading ends of the films unwound from the two film rolls were already heat-sealed to form a screen, and the corrugated sheet to be fed was fed from the leading ends and automatically packed. As the film, a biaxially stretched high-density polyethylene film having a thickness of 70 μm, a width of 760 mm, and a maximum shrinkage of 40% was used. Next, the film was heat-sealed and cut at 150 ° C. by a heat sealer composed of a seal bar and a pedestal, and the corrugated sheet was packaged in a sleeve form. Next, the wrapped corrugated sheet was heated in a heating furnace set to an internal temperature of 170 ° C. and passed through for about 10 seconds. As a result, the film shrank and adhered to the corrugated sheet. The package that passed through the heating furnace was then moved to a third conveyor, where the portion of the film that was not in close contact with the corrugated sheet was pressed by a roll of silicone rubber to prepare the package.

[0014]

The effects of the present invention are listed below. 1) In the whole packing operation, a portion requiring human labor is small, and labor and cost of the packing operation can be reduced. 2) A large corrugated sheet, which was difficult to pack, can be easily packed. 3) The finish of the packaging is constant regardless of the operator.
Therefore, transportation and handling of the package are facilitated. 4) Only a film needs to be prepared, and no adhesive tape or the like is required. 5) No waste is generated after packing. 6) When unpacking, only one of the heat-sealed portions needs to be peeled off by hand, and no tools such as scissors are required.
That is, since the opening operation of the package is easy, the labor for the user of the package is reduced. 7) Since the package cannot be folded, it is easy to open a part of the package and extract only a part of the corrugated sheet. 8) Since the adhesiveness between the film and the corrugated sheet is high, when only a part is extracted and the rest is stored, the possibility that dust adheres to the corrugated sheet is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one example of a packing step according to the present invention.

FIG. 2 is a schematic explanatory view showing a packing form of a corrugated sheet according to the present invention.

FIG. 3 is a schematic explanatory view showing a conventional example of a method of packing a corrugated sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First conveyor 2 Second conveyor 3 Heating furnace 4 Third conveyor 5, 15, 17 Corrugated plate 6, 16 Heat-shrinkable film 7, 8 Film roll 9, 9 ', 10 and 10' Film guide roll 11 Seal bar 12 Pedestal 13 Free roll 14 Adhesive member 18 Synthetic resin film 19 Adhesive tape

Claims (1)

[Claims] 1. A plurality of corrugated sheets stacked on a conveyor are transported on a conveyor, and the corrugated sheets are sandwiched between two heat-shrinkable films supplied from both upper and lower directions. Seal, cut, heat-shrink the film by introducing it into a heating furnace, and then press the film on both sides of the corrugated sheet with a roll,
A method for packing a corrugated sheet, characterized in that the sheet is brought into close contact.