JP4104237B2 - Heat sealing device for polystyrene foam container - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a heat sealing device for welding and joining a lid to a container body such as a food container.
[0002]
[Prior art and problems]
Conventionally, for example, a heat sealing device as shown in a perspective view of FIG. 4 is used for bonding a lid of a food container made of, for example, polystyrene foam. That is, in FIG. 4, after putting food such as natto into the main body 52a of the container 52, the heat sealing device 51 heat seals and seals the other end of the lid 52c whose one end is connected to the main body 52a. The plurality of containers 52, 52, 52 sent on the belt conveyor are stopped at predetermined positions, and in this state, as schematically shown in FIG. 5, the lid 52c and the container main body 52a A heating element 55 is inserted between the flanges 52b on the upper surface side from the lateral direction, the flanges 52b and the lid 52c of the container are melted by the heating elements 55, and then the pressing plate 57 is pressed on the lid 52c from above. The lid 52 c is welded and joined to the upper surface of the main body 52 a by the pressing plate 57, and the plurality of heating elements 55, 55, 55 are composed of, for example, a heater or a hot plate, and are reciprocatingly moved by the cylinder 53. Board 5 A plurality of heating elements 55, 55 has a what is connected, also, the pressing plate 57 is configured to be vertically moved by the air cylinder 56 to.
[0003]
In such a conventional heat sealing device 51, the plurality of containers 52, 52, 52 are temporarily stopped at the positions where the heating elements 55, 55 are heat-sealed, so it is necessary to provide a stop time. There is a problem that high speed operation is not possible, and since the heating element 55 is inserted between the flange 52b and the lid 52c of the container 52, the opening of the flange 52b and the lid 52c is narrow. Even if it is too wide, there is a problem that the degree of melting by the heating element 55 is not constant, and it is difficult to maintain the accuracy of the clearance between the flange 52b and the lid 52c, and the temperature of the heating element 55 If the management is not performed correctly, there is a problem that joining mistakes frequently occur. Further, the melted portions of the flange portion 52b and the lid 52c have a dirty finish, and the portion where the heating element 55 contacts melts to form a charcoal. And, there is a problem that it may be mixed into the food in the main body 52a.
[0004]
[Means for Solving the Problems]
The present invention has been devised in view of the above-mentioned conventional problems, and aims to provide a heat sealing device for a container made of polystyrene foam that can be continuously operated at high speed and can be heat-sealed in an accurate and beautiful state. The gist of the invention is a heat sealing device for welding and joining a polystyrene foam lid to a polystyrene foam container body transported on a conveyor, and the heat seal device blows hot air between the container body and the lid. A hot air generator that can be operated, and a pressure contact device that presses the lid toward the container body after the hot air is ejected from the hot air generator, and the hot air generator includes a heater for heating inside. A main body having a nozzle projecting on the front end side. The main body is configured such that air compressed by a compressor or the like is supplied through an air pipe, and An upper ejection hole and a lower ejection hole for ejecting hot air are formed on the tip end side of the nozzle, and the nozzle is disposed between the upper surface collar of the container body and the lid, so that the nozzle upper ejection hole and the lower ejection hole are disposed. The hot air generated in the main body portion is ejected from the hole, and the joining surface of the upper surface flange portion and the lid of the container main body can be melted by the hot air .
[0005]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a main part of a container heat-sealing device. The heat-sealing device 1 in this example stops the conveyor for a plurality of containers 2, 2 and 2 transferred on the conveyor. The hot air generator 3 and the pressure welding device 10 are provided at predetermined positions, and the hot air generator 3 has a main body portion as schematically shown in FIG. 3a has a heater 4 for heating, a nozzle 6 projects from the tip side, a temperature sensor 5 such as a thermistor is provided on the nozzle 6 side, and the main body 3a is compressed by a compressor or the like. The air is supplied through the air pipe 7, and an upper ejection hole 6a and a lower ejection hole 6b for ejecting hot air up and down are formed on the tip side of the nozzle 6, An upper surface flange 2b of the main body 2a of the container 2; The nozzle 6 is arranged between the lids 2c, and in this state, hot air generated in the main body 3a, for example, about 300 ° C. to 500 ° C. is ejected from the nozzle upper jet hole 6a and the lower jet hole 6b. Then, the joining surface of the flange 2b and the lid 2c is melted, and then the lid 2c is pressed downward by the pressure contactor 10 so that the melted portion of the lid 2c and the melted portion of the flange 2b are crimped. 3, the welded portion C is formed and the lid 2 c is securely welded to the upper surface of the main body 2 a, and the presser 10 is pressed by a pair of drive shafts 8 a and 8 a in this example. The pressure belt 9 is wound between the rollers 8 and 8 and rotated to press the lid 2c from above.
The press contactor 10 has a structure in which the lid 2c is pressed and bonded to the main body 2a side with a pressing plate or the like using a conventional air cylinder instead of the pressing rollers 8 and 8. May be.
[0006]
Thus, in this example, the air flowing through the air pipe 7 and flowing into the main body 3a of the hot air generator 3 is heated by the heater 4 to generate hot air, which is ejected from the ejection holes 6a and 6b of the nozzle 6. Thus, the joining portion of the container 2 is melted by hot air, and it is not necessary to accurately adjust the distance between the lid 2b and the lid 2c as in the conventional heater or hot plate type, and the lid 2c and the lid 2b Hot air can be jetted from the jet holes 6a and 6b without worrying about the difference in the vertical distance, the hot air can be satisfactorily brought into contact with the flange 2b and the lid 2c, and necessary portions can be melted with hot air, As in the conventional case, the contact portion with the heater is carbonized, the carbonized material is not mixed in the main body 2a, foreign matter is not mixed in the container, and the sealing failure can be reduced, Temperature sensor 5 temperature sensor It becomes capable of easily controlled through. Moreover, there is no need to temporarily stop the conveyor for transferring the containers 2 at a predetermined position as in the prior art, while the transfer conveyor is continuously operated, hot air is continuously blown from the hot air generator 3 at the predetermined position, And after that, the lid 2c can be pressed by the pressure welder 10 so that the lid 2c is continuously welded to the upper surface of the main body 2a, the sealing time is short, and high-speed operation is possible. Can be reduced in size.
[0007]
【The invention's effect】
The present invention relates to a heat seal device for welding and joining a foamed polystyrene lid to a foamed polystyrene container body transported on a conveyor, and the heat sealing device jets hot air between the container body and the lid. A hot air generator that can be operated, and a pressure contact device that presses the lid toward the container body after the hot air is ejected from the hot air generator, and the hot air generator includes a heater for heating inside. A main body having a nozzle projecting on the front end side, and the main body is configured such that air compressed by a compressor or the like is supplied through an air pipe, and on the front end side of the nozzle An upper ejection hole and a lower ejection hole for ejecting hot air are formed on the upper and lower sides, and the nozzle is disposed between the upper surface flange of the container main body and the lid, and the main body section includes the nozzle from the upper ejection hole and the lower ejection hole. Generated Hot air is jetted to, by being configured so as to be able to melt the top flange portion and the joint surface of the lid of the container body by hot air, hot air generator between the container body and the lid sent by conveyor The hot air is blown out from the melted surface, and the joint surface can be melted with hot air, and then the lid can be pressed and welded well to the container body, making it possible to continuously weld and join the lid at high speed. In addition, since it is melted by hot air, the bonding surface can be melted well even if the distance between the container body and the lid is not accurately adjusted, and the sealing failure can be reduced. In addition, the resin is not carbonized and mixed into the container main body, and an excellent sealing operation can be performed accurately and at high speed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a heat seal device for a container.
FIG. 2 is a schematic configuration diagram illustrating a main part in a state where hot air is ejected from a hot air generator in the apparatus of FIG. 1;
FIG. 3 is a state diagram in which hot air is blown out in FIG. 2 to melt a joint, and then a lid is pressed from above to be welded and joined.
FIG. 4 is a perspective view of a main part of a conventional heat seal device.
FIG. 5 is an explanatory configuration diagram of a state in which a joining surface is melted by a conventional heating element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat seal apparatus 2 Container 2a Main body 2b Gutter part 2c Lid 3 Hot air generator 3a Main body part 4 Heater 5 Temperature sensor 6 Nozzle 6a Upper ejection hole 6b Lower ejection hole 7 Air pipe 8 Pressure roller 9 Pressure belt 10 Pressure contactor

Claims (1)

A heat sealing device for welding and joining a foamed polystyrene lid to a foamed polystyrene container body transported on a conveyor , wherein the heat sealing device can eject hot air between the container body and the lid. Comprising a hot air generator, and a pressure welding device that presses the lid toward the container body after the hot air is ejected from the hot air generator ,
The hot air generator includes a main body having a heater for heating inside and a nozzle protruding from the tip side, and air compressed by a compressor or the like is supplied to the main body through an air pipe. And an upper ejection hole and a lower ejection hole for ejecting hot air in the vertical direction are formed on the tip side of the nozzle, and the nozzle is disposed between the upper surface collar of the container body and the lid, Hot air generated in the main body portion is ejected from the upper and lower ejection holes, and the joining surface of the upper surface flange portion and the lid of the container body can be melted by the hot air. Heat seal device for container.

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