JPH09118317A - Method and apparatus for heat-shrink packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly heat-shrink a packaging material with less calorific power and in a shorter time than conventional by blowing a hot blast partially and continuously even when the packaging material receiving an object to be packaged is to be hear-shrunk by batch operation. SOLUTION: When an object to be packaged is received between packaging materials made of a heat-shrinkable film, opening rims of the material are heat-sealed to provide a package, and then the material is heat-shrunk to be closely attached to the object, a hot blower 9 including a pair of upper and lower blowing arms 13, 15 is employed in heat-shrinking the material. The object is put on a support member 5 comprising a net or the like between the upper and lower blowing arms 13, 15. By relatively moving the upper and lower blowing arms 13, 15 and the package, a hot blast is blown to both upper and lower faces of the package simultaneously from a direction to another direction, thereby heat-shrinking the packaging material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for placing a packaged object in a packaging material made of a heat-shrinkable film and heat-sealing it, and then heat-shrinking the packaging material by hot air to tightly package the packaged object. It is a thing.

[0002]

2. Description of the Related Art As conventional techniques, there is a method in which a package stored in a packaging material is fed into an atmosphere heated by hot air for continuous shrink wrapping, and a package is put in a shrink chamber and then heated by hot air. There is a method of shrink-wrapping after creating an atmosphere. The former is suitable for continuously packaging a large amount of products, and the latter is suitable for batch packaging of products sold in a store or the like.

[0003]

[Problems to be Solved by the Invention] Japanese Patent Publication Sho 58-1015
The device described in the publication has a structure suitable for heat shrink wrapping of products by batch operation. In this device, the shrink chamber in the housing is covered with an upper lid, and the upper lid is opened to wrap the packaging material. After heat-sealing, the package is placed in a shrink chamber, the upper lid is closed, and hot air is blown into the shrink chamber to create a heated atmosphere. The hot air is blown from the lower part of the contraction chamber, and therefore the fan is agitated to make the temperature uniform.

In such a conventional apparatus, it takes time for the temperature of the shrinking chamber to rise to the temperature required for the heat shrinkage of the packaging material, and the hot air is blown upward from one portion below the shrinking chamber. Before the temperature of the shrink chamber reaches the heat shrink temperature,
The lower surface of the package placed on the net is heated, and heat shrinkage starts before the upper surface. For this reason, uneven shrinkage is likely to occur on the upper and lower surfaces, and the lower surface tends to be heated compared to the upper surface, which makes it difficult to perform uniform contact packaging.

Further, taking out the article which has been shrink-wrapped is
Since the upper lid is opened each time, hot air escapes each time the article is taken out, the temperature inside the shrink chamber returns to room temperature, and hot air must be supplied again to the shrink chamber for the next work. Have economy and.

The present invention has been conceived in order to solve the above-mentioned conventional problems, and its object is to blow hot air even if it heats and shrinks the packaging material containing the articles to be packaged by a batch operation. By partially and continuously spraying, a new heat-shrinkable packaging method and device that can uniformly heat-shrink the packaging material with a smaller amount of heat than before and that can perform the packaging work in a short time. To provide.

[0007]

According to the method of the present invention for the above object, a packaged article is housed between packaging materials made of a heat-shrinkable film, and an opening edge of the packaging material is heat-sealed to form a package. After that, when the packaging material is heat-shrinked and closely adhered to the packaged object, a hot-air device equipped with a pair of upper and lower blowing arms is used for heat-shrinking the packaging material, and a supporting member such as a net between the upper and lower blowing arms is used. The package is placed, and the relative movement of the upper and lower blowing arms and the package blows hot air from one side to the other on the upper and lower surfaces of the package at the same time to heat and shrink the packaging material.

The relative movement of the upper and lower blowing arms and the package is carried out by supporting the package in a stationary state in the contraction chamber and moving the hot air device having the blowing arm laterally with respect to the package, or conversely hot air. The device is installed in a stationary state, and the package provided with the blowing arm is moved laterally with respect to the hot air device. In any of these, as long as the hot air from the upper and lower blowing arms is partially and continuously blown to the package from one to the other,
Similar effects can be obtained.

Further, the apparatus of the present invention comprises a box-shaped main body having an interior opening in a contraction chamber, a packaging section connected to one end of the box-shaped main body, a net for vertically dividing the contraction chamber, and the like. A support bar for the package and a guide bar that hangs laterally on the rear side of the box-shaped main body along the contraction chamber, and a support frame is rotatably supported by the guide bar so that the opening edge of the contraction chamber An L-shaped heat sealer provided along the two sides of the packaging section side and the front side section, an upper blowing arm in which the base end section is connected to a case containing a blower, and a communication pipe are bent upward at the base end section. The formed lower blowing arm is connected to each other in a U-shape through bearings protruding from the case side and the communicating pipe side to communicate with each other, and a hot air device provided with a heater in the blowing arms. And slide the bearing part of the hot air device into the guide bar slidably. At the same time, the tip of the upper blowing arm is movably engaged with the support frame on the front side of the heat sealer so that the upper and lower blowing arms of the hot air device can move laterally into the contraction chamber, and the case and the upper blowing arm can be moved. It is provided so that it can move up and down together with the heat sealer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figure, reference numeral 1 is a box-shaped main body, and a wrapping portion 2 is continuously provided at one end thereof. The inside of the box-shaped main body 1 is formed in a contraction chamber 3 having an open upper part and a side end opposite to the packaging part 2. The inside of the contraction member 4 is fixed to both wall parts of the contraction chamber 3 from the side end. 4 and is divided into upper and lower parts by a supporting member 5 made of a net, and the supporting member 5 can be changed in height position depending on the thickness of the package by changing the inserting position into the receiving members 4 and 4 up and down. You can

Reference numeral 6 denotes a guide bar extending horizontally along the contraction chamber 3 on the upper rear side of the box-shaped main body 1, and holds a support frame 8 of the heat sealer 7 (see FIG. 7) and a hot air device 9. . The heat sealer 7 rotatably supports the end portion of the support frame 8 on the guide bar 6, and the pad 10 provided along the two sides of the opening edge of the contraction chamber 3 on the packaging portion side and the front side portion. It consists of an L-shaped one that is superposed on top and has an impulse heater inside.

The hot air device 9 is a sirocco type blower 1.
A hollow upper outlet arm 13 having a base end portion continuously connected to a case 12 containing 1 and a hollow lower outlet arm 15 having a communication pipe 14 bent upward at the base end portion are connected to the inside of the lower surface of the case. The pipe 14 has a structure in which it is connected in a U-shape to each other through a bearing portion 16 protrudingly provided on the outer side of the upper end of the pipe 14 to communicate the inside. The upper outlet arm 13 has an outlet 17 in the longitudinal direction of the lower surface, and the lower outlet arm 14 has an outlet 18 in the longitudinal direction of the upper surface, and heaters 19 and 20 are arranged inside the outlets 17 and 18, respectively. I am doing it.

A handle 21 is attached to the tip end surface of the upper blowing arm 13, and a guide piece 22 engaging with a lateral groove provided on the front side surface of the support frame 8 is bent and extends below the tip end. There is. A support wheel 23 rolling on the bottom plate of the contraction chamber 3 is attached to the tip of the lower blowing arm 15.

In such a hot air device 9, the bearing portion 15 is slidably inserted into the guide bar 6 from the side, and the guide piece 22 at the tip of the upper blowing arm 13 is laterally grooved on the front surface of the support frame 8. It is mounted on the box-shaped main body 1 by movably engaging with. As a result, the lower outlet arm 15 is positioned below the support member 5 in the contraction chamber 3 with the outlet 18 facing upward. The upper outlet arm 13 is located above the upper opening of the contraction chamber 3 with the outlet 17 facing downward, and moves up and down together with the heat sealer 7 via the support frame 8 with the guide bar 6 as a fulcrum.

Reference numeral 24 is a base plate provided on the wrapping section 2 with a required space provided, and the outer end of the base plate is bent and formed into an upwardly facing separator 25 which is slanted downward. This base plate 2
As shown in FIG. 7, a roller 27 on the lower side of 4 is wound with a packaging material 27 made of a heat-shrinkable film which is folded in two with the opening edge facing the front, and the packaging material 27 sandwiches the separator 25. So that the rollers 2 are divided into upper and lower surfaces of the base plate 24.
It is drawn from 6.

6 to 8 sequentially illustrate the heat shrink packaging process by the above apparatus. First, as shown in FIG. 6, the upper blowing arm 13 and the heat sealer 7 of the hot air device 9 are rotated to move upward and placed obliquely. Further, the position of the hot air device 9 is placed closer to the packaging unit 2. After that, the packaged object 28 is placed on the base plate 24 by the separator 25.
It is placed from the side in the half-folded packaging material 27 opened by. Since the tip opening of the packaging material 27 is heat-sealed during the previous heat-shrink packaging except for the first case, the packaging material 27 is put together with the packaged object 28 after the storage.
As shown in FIG. 5, the contraction chamber 3 is moved to a position above the support member 5 and pulled out.

Next, after positioning, the heat sealer 7 is lowered to the original position together with the upper blowing arm 13, and the packaging material 27
Is sandwiched between the pad 10 and the pad. At this time, the energization occurs and the wrapping material 27 around the packaged object 28 is heat-sealed in an L shape, whereby the opening edge and the extra length portion are welded and cut, and the wrapping material 27 covers the packaged object 28. Form a packaged bag.

Following the completion of the heat sealing, the hot air device 9 is energized, and the heater 1 in the upper and lower blowing arms is
9 and 20 are heated, and the blower 11 is rotated to start blowing air. The air is heated while passing through the heaters 19 and 20, and immediately becomes hot air.
Is blown from both sides of the package placed on the support member 5.
As a result, the packaging material 27 is heated and contracted.

When the heat shrinkage of the packaging material 27 becomes visible, when the upper blowing arm 13 is manually moved laterally toward the opening side end (to the left in the drawing), the lower blowing arm 15 is also moved laterally at the same time. Then, the upper and lower packaging materials 27 are heated and shrunk in order and closely adhere to the packaged object 28 along with the movement, and the lateral movement from one side to the other side can be performed while observing the contracted state. Prevents bag breakage due to contraction. Also, the upper and lower blowing arms 13, 15
When hot air is blown from one side to the other on the upper and lower sides of the package due to the horizontal movement of the packaging material to heat-shrink the packaging material, wait until the shrinking chamber becomes a heating atmosphere sufficient to heat-shrink the whole as in the conventional case. It is not necessary to perform the packaging work from the heat sealing of the packaging material 27 to the heat shrinkage continuously.

Since the heat shrinking of the packaging material 27 is performed inside the open shrinking chamber 3, the upper and lower blowing arms 1 are
The hot air blown from 3, 15 hits the package on the support member 5, and then escapes from the shrink chamber 3 to the outside of the box-shaped body 1 to cause energy loss. Since the amount is smaller than that in the case where the contraction chamber is maintained in a heated atmosphere, the energy loss is smaller than in the conventional case where the entire amount of hot air in the contraction chamber escapes to the outside each time.
Running cost is reduced because it also saves power consumption.

In the above embodiment, the hot air device is moved to perform the heat shrink wrapping. However, on the contrary, the hot air device is fixed and the support member side is moved laterally so that the hot air is blown from one side to the upper and lower sides of the package. The packaging material may be heat-shrinked by spraying on the other side. In this case, the design change only by circulating the support member by adopting the conveyor is sufficient.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus capable of implementing the heat shrink packaging method of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a side view of the hot air device.

FIG. 5 is a perspective view showing a state in which an upper blowing arm and a heat sealer are raised.

FIG. 6 is an explanatory diagram showing a state in which a packaged object is housed between packaging materials.

FIG. 7 is an explanatory diagram showing a state in which the packaging material and the article to be packaged are transferred to the shrink chamber.

FIG. 8 is an explanatory diagram showing a state in which the hot air device is laterally moved to perform thermal contraction.

[Explanation of symbols]

 1 Box-shaped main body 2 Packaging part 3 Shrinkage chamber 5 Net support member 6 Guide bar 7 Support frame 8 Heat sealer 9 Hot air device 10 Pat 11 Blower 12 Case 13 Upper blow arm 15 Lower blow arm 16 Bearing part 19 Heater 20 Heater 24 units Plate 27 Packaging material 28 Packaged object

Claims (2)

[Claims] 1. A packaged object is placed between packaging materials made of a heat-shrinkable film, the opening edge of the packaging material is heat-sealed to form a packaged product, and then the packaging material is heat-shrinked to adhere to the packaged object. In doing so, a hot air device having a pair of upper and lower blowing arms is adopted for heat shrinking of the packaging material, and the package is placed on a support member such as a net between the upper and lower blowing arms, and the upper and lower blowing arms and the package are The heat shrink wrapping method is characterized in that hot air is simultaneously blown from one side to the other side of the package by the relative movement of the package to heat and shrink the packaging material. 2. A box-shaped main body formed inside a contraction chamber having an upper opening, a wrapping section connected to one end of the box-shaped main body, and a support for a package by a net or the like for partitioning the contraction chamber into upper and lower parts. A guide bar laid laterally on the rear side of the box-shaped main body along the member and the contraction chamber, and a support frame rotatably pivotally supported on the guide bar, so that the packing frame side and the front side of the opening edge of the contraction chamber. L-shaped heat sealer provided along two sides with the upper part, an upper blowing arm in which a base end is continuously connected to a case in which a blower is installed, and a lower blowing arm in which a communication pipe is bent upward at the base end Are connected to each other in a U-shape through bearings projecting on the case side and the communicating pipe side to communicate the inside, and a hot air device having a heater provided in the blowing arms is provided. Insert the above bearing part of the The top end of the chamber is movably engaged with the support frame on the front side of the heat sealer so that the upper and lower blowing arms of the hot air device can move laterally into the contraction chamber, and the case and the upper blowing arm together with the heat sealer. A heat-shrinkable packaging device, which is vertically movable.