JP3039592B2 - Heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for melting a resin layer by impinging hot air on a resin layer on a surface of a paper container.

[0002]

2. Description of the Related Art A resin layer is formed on the surface of a piece of paper constituting a paper container. For example, when a material to be filled is filled from an upper opening of the paper container and the opening is sealed, the opening is closed. Hot air is applied to the seal margins on the entire inner periphery of the resin to melt the resin layer of the seal margins, the seal margins are matched, and the work is performed by pressing and joining. A piece of paper constituting such a paper container includes, for example, a paper material (basis weight 320 g / m ² ) and an outer thermoplastic resin layer (PE2) formed on the surface of the paper material facing the outside of the container.
0μ), an inner first thermoplastic resin layer (PE25μ) formed on the surface of a paper material facing the inside of the container, and the inner first thermoplastic resin layer (PE25μ).
A gas barrier layer formed inside the thermoplastic resin layer,
An inner second thermoplastic resin layer (PET12μ) formed inside the gas barrier layer, and an inner third thermoplastic resin layer (PE60) formed inside the inner second thermoplastic resin layer
μ). The gas barrier layer is used to prevent the material to be filled from being affected by oxygen, light, or the like in the air. The gas barrier layer is made of aluminum foil (7 μ).
Are often used.

On the other hand, in recent years, recyclable containers have been demanded from the viewpoint of environmental problems and the like. From the viewpoint of such environmental problems, a conventional container using an aluminum foil as a gas barrier layer becomes incinerated garbage and becomes a non-recyclable container.

[0004]

In order to make the container recyclable, something other than aluminum foil must be used as the gas barrier layer. In this case, as the substance used for the gas barrier layer other than the aluminum foil, for example, a vapor deposition film of silicon oxide or magnesium oxide can be considered, but these vapor deposition films of silicon oxide or magnesium oxide have thermal conductivity. Low. In other words, in a conventional container using aluminum foil as a gas barrier layer, since the aluminum foil has excellent thermal conductivity, when hot air is impinged on the sealing allowance, heat is dispersed by the thermal conductivity of this aluminum foil, The resin layer for the seal allowance was almost uniformly melted, and the seal allowance could be securely joined.

However, when a substance having low thermal conductivity, such as a vapor-deposited film such as silicon oxide or magnesium oxide, is used as the gas barrier layer, the thermal conductivity of the paper sheet decreases, and hot air hits the seal. In this case, as shown in FIG. 8, only the location where the hot air blows out from the hot-air blowing hole 71 is heated, and the heat is not distributed to the entire resin layer 73 inside the paper material 72, so that the location where the hot wind hits the location. In such a case, there is a possibility that foaming 75 occurs, or foaming progresses further to produce a pinhole 77, so that the seal margin cannot be reliably joined.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to prevent foaming and pinholes even when a material having low thermal conductivity is used as a gas barrier layer. It is an object of the present invention to provide a heating device capable of uniformly melting a resin layer by hot air without generation.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a paper container comprising a paper material and resin layers formed on both surfaces of the paper material. The resin layer located in is composed of a plurality of layers, and one of the plurality of layers is made of a material other than aluminum foil so that the filling object is not affected by oxygen, light, or the like in the air. A heating device that impinges hot air on an upper opening located inside such a paper container and melts the resin layer of the portion, which is located inside the paper container. A heating box arranged to face the location where the resin layer of the upper opening is melted, and hot air supplied to the inside; and the heating box facing the location where the resin layer of the upper opening located inside the paper container is melted Hot air blow-out provided in many parts And a use hole, aperture facing the resin layer of the hot-air blowout hole is characterized in that the diameter of the hot-air blowing hole is formed in the tapered surface increases as closer to the resin layer.

[0008]

The hot air supplied to the inside of the heating box is impinged on the resin layer while being diffused from the hot air blowing holes, so that the resin layer is uniformly melted.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the embodiment, after filling the filling material into a paper container having a rectangular shape in a plan view and an open top, the left and right halves are folded inward, and the front and rear surfaces are turned inward to seal in a göbel shape. The case will be described. FIG. 1 shows a front view of a heating device according to the present invention. The heating device 1 is disposed via a frame 5 above the conveying path of the container 3,
Is provided with a heating box 7 into which hot air is supplied, an air cylinder 9 for moving the heating box 7 up and down, and the like. The frame 5 is supported on a base (not shown) via an arm 11 and a rod 13.
Is erected on the frame 5, and a cylindrical body 17 is suspended from the frame 5 via a bracket 15, and hot air from a hot air supply source is supplied to the cylindrical body 17. The expansion and contraction of the piston rod of the air cylinder 9 causes the two guide rods 19 connected to the piston rod to move up and down, and each of the guide rods 19 passes through the bearing 21 attached to the frame 5 and Extend below the frame 5. The lower end of the guide rod 19 is attached to the upper end of an outer cylinder 23 disposed outside the cylindrical body 17, and the heating box 7 is attached to the lower end of the outer cylinder 23. Therefore, the hot air from the cylindrical body 17 is supplied to the inside of the heating box 7 through the outer cylinder 23, and the heating box 7 moves up and down by the expansion and contraction operation of the air cylinder 9,
Reference numeral 25 in FIG. 1 indicates a temperature sensor.

FIG. 2 shows a sectional bottom view of the heating box.
In the case of sealing in a goebel type, the heating box 7 is melted in order to melt the resin layer for the seal margin on the entire inner periphery of the upper opening 301 of the paper container 3 and the resin layer for the seal margin on the left and right sides.
Is composed of a first heating box 31 for melting the resin layer of the seal allowance on the entire inner periphery and a pair of second heating boxes 32 for dissolving the resin layers of the seal allowance on the left and right sides. In this embodiment, at the same time, Two sets of heating boxes 7 are provided so as to melt the seal margins of the two paper containers 3. Among the side surfaces of the first heating box 31, front and rear surfaces 303 of the container 3
Is formed with a flat surface 3101, and
The surface corresponding to the left and right surfaces 305 of the container 3 is formed by a bent surface 3103 that is depressed inward corresponding to the upper opening 301 of the container 3 that has been folded. The surface of each second heating box 32 facing the seal margin outside the left and right surfaces 305 of the container 3 projects toward the first box in correspondence with the folded upper opening 301 of the container 3. It is formed of a bent surface 3201.

The surface 3101 of the first heating box 31
3103 and the surface 3201 of the second heating box 32
As shown in FIG. 3, a large number of hot air blowing holes 35 are provided. As shown in FIG. 4, the hot air blowing hole 35 has a portion 3501 located inside the heating box 7.
Is formed to a predetermined length with a uniform diameter (1 mm), and a portion facing the container 3 has a tapered surface 35 whose inner diameter gradually increases as it approaches the container 3 by counterbore.
Thus, the opening 3505 (having a diameter of 2 mm) of the hot air blowing hole 35 facing the container 3 is formed with a larger diameter than the hole portion 3501 located inside.

The paper container 3 is made of paper (basis weight 320 g /
m ² ), an outer thermoplastic resin layer (PE20μ) formed on the surface of the paper material, and an inner first thermoplastic resin layer (PE25μ) formed on the surface of the paper material facing the inside of the container 3. A gas barrier layer (PET film in which silicon oxide is deposited to a thickness of 0.1 to 0.15 μm) formed inside the first inner thermoplastic resin layer, and a second inner gas barrier layer formed inside the gas barrier layer. A thermoplastic resin layer (PET12μ) and an inner third thermoplastic resin layer formed inside the inner second thermoplastic resin layer;
It is composed of a thermoplastic resin layer (PE 60μ).

Next, the operation will be described. The heating box 7 is located on the conveyance path of the container 3 as shown by a solid line in FIG. 1. When the container 3 is conveyed and positioned at a predetermined position below the heating box 7, the air cylinder 9 is contracted. Then, the heating box 7 descends, and the surfaces 3101 and 310 of the first heating box 31 and the second heating box 32, respectively.
3, 3201 faces a predetermined portion of the upper opening 301 of the container 3. Then, each surface 3101, 31 of the heating box 7
Hot air is blown from the hot-air blow-out hole 35 of 03,3201 toward the seal margin of the container 3.

When the hot air is blown out, a tapered surface 3503 whose diameter increases as approaching the container 3 is formed in a portion where the hot air blowing hole 35 faces the container 3 side. As shown in FIG. 5, the supplied hot air is diffused by the tapered surface 3503 and hits the seal allowance of the container 3, so that the seal allowance is evenly heated and the resin layer is evenly melted. In FIG. 5, 37
Is a paper material, 39 is an outer thermoplastic resin layer formed on the surface of the paper material 37, 41 is ink printed on the surface of the outer thermoplastic resin layer 39, 43 is a gas barrier formed on the inner side of the paper material 37 5 shows inner first to third thermoplastic resin layers including layers. Therefore, even when a substance having low thermal conductivity, such as silicon oxide or magnesium oxide, is used as the gas barrier layer, only the hot air impingement points are heated and foaming occurs at the hot air impingement points. In addition, problems such as the formation of pinholes due to further progress of foaming are eliminated, the resin layer is uniformly melted, and the seal margin can be securely joined and folded into a goebel type.

FIG. 6 shows an experimental result of a container in which the sealing allowance is melted by the heating device 1 according to the present embodiment and folded in a gobel shape, and FIG. 7 is provided with a hot air blowing hole having a uniform diameter (1 mm). The experiment result of the container 3 which melt | dissolved the seal | sticker allowance by the conventional heating apparatus and folded it into the Goebel type | mold is shown. In the experiment, the temperature of the hot air was set to 260 ° C, 290 ° C, and 320 ° C,
When the wind pressure was set to 40 mmAq and 60 mmAq, an inspection for leakage, an inspection of a surface shape of a seal allowance, and an inspection of a permeated liquid were performed. Inspection for leakage is done by turning the container upside down and putting turpentine oil inside the container.
This was done by applying a colored liquid.

In the heating device 1 according to the present embodiment, as shown in FIG. 6, there was no leakage in the leakage inspection and the permeated liquid inspection. However, after the temperature of the hot air was set to 290 ° C. and the wind pressure was set to 60 mmAq, signs of craters appeared, and craters occurred after the temperature of the hot air was set to 320 ° C.

On the other hand, in the conventional heating device, FIG.
As shown in the figure, the temperature of hot air was set to 260 ° C and the wind pressure was set to 40 mm.
When Aq was used, there were many missing portions where the resin layer was not melted, and the test could not be performed. In addition, the temperature of hot air is set to 260
° C and the wind pressure is 60 mmAq.
Leakage occurred when the temperature was set to 0 ° C. and the wind pressure was set to 40 mmAq.
In addition, when the temperature of the hot air is set to 260 ° C. and the wind pressure is set to 60 mmAq, a sign of a crater appears, and the temperature of the hot air is set to 290 ° C.
As a crater occurred. Further, in the permeation liquid inspection, when the temperature of the hot air was set to 260 ° C. and the wind pressure was set to 60 mmAq, and when the temperature of the hot air was set to 290 ° C. and the wind pressure was set to 40 mmAq, leakage occurred at the glue allowance.

[0018]

As is clear from the above description, the present invention
A paper container comprising a paper material and a resin layer formed on each surface forming both sides of the paper material, wherein the resin layer located inside the container is constituted by a plurality of layers, and One of the layers is a gas barrier layer made of a material other than aluminum foil to prevent the filling material from being affected by oxygen, light, etc. in the air, and the upper part located inside such a paper container. A heating device that impinges hot air on an opening portion to melt a resin layer in the portion, the heating device being disposed facing a location where the resin layer in an upper opening portion located inside the paper container is melted, and having a hot air flow therein. A heating box to which the resin layer of the upper opening located inside the paper container is melted, and a plurality of hot air blowing holes provided in the heating box portion facing the portion where the resin layer is melted. Opening of the hole facing the resin layer Is formed with a tapered surface the diameter of the hot-air blowing hole increases as approaching the resin layer.

Therefore, even when a material having a low thermal conductivity other than aluminum foil is used as the gas barrier layer of the material of the container, the resin layer should be uniformly melted without generating bubbles or pinholes due to the hot air. This makes it possible to reliably seal the paper container, which is advantageous in obtaining a recyclable container.

[Brief description of the drawings]

FIG. 1 shows a front view of a heating device according to the present invention.

FIG. 2 shows a sectional bottom view of the heating box.

FIG. 3 is a front view of a surface of a heating box in which hot air blowing holes are formed.

FIG. 4 is a cross-sectional view of a hot air blowing hole.

FIG. 5 is an explanatory diagram in which hot air is blown out from a hot air blowing hole.

FIG. 6 is an explanatory diagram of an experimental result of the heating device according to the present embodiment.

FIG. 7 is an explanatory diagram of an experimental result of a conventional heating device.

FIG. 8 is an explanatory view in which hot air is blown out from a conventional hot air blowing hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating device 3 Container 7 Heating box 31 First heating box 32 Second heating box 35 Hole for hot air blowing 3101, 3103, 3201 Surface of heating box 3503 Tapered surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 62-197508 (JP, U) JP-A 4-53468 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B65B 51/00-51/32 B65B 7/16

Claims (1)

(57) [Claims] 1. A paper container comprising a paper material and resin layers formed on both surfaces forming both sides of the paper material .
The resin layer located on the side is composed of a plurality of layers,
One of the layers is made of a material other than aluminum foil
The packing material is not affected by oxygen or light in the air.
It is a gas barrier layer to make the hot air impinge on the upper opening located inside such a paper container,
A heating device for melting the resin layer of the portion , wherein the heating box is arranged facing a location where the resin layer of the upper opening located inside the paper container is melted, and hot air is supplied to the inside, A plurality of hot-air blowout holes provided in the heating box portion facing a place where the resin layer in the upper opening portion located inside the paper container is melted; and an opening portion of the hot-air blowout hole facing the resin layer. Is
The diameter of the hot-air blowing hole increases as it approaches the resin layer.
A heating device characterized in that the heating device is formed by a tapered surface .