JPS6213925Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a container heat sealing device.

Prior art and its problems When heat-sealing a lid to a container, it is common practice to pressurize and heat the lid to the container using a heating plate. By the way, when the thickness of the lid is large, the heat transfer efficiency of the lid is poor and a sealing failure may occur. In order to prevent this, it is known to preheat the part of the lid to be sealed and then heat seal the lid to the container (for example, Japanese Patent Publication No. 53-3703). There was a problem in that extra time was required for the heat sealing process.

It is also known that in order to shorten the heat sealing time, the container is formed of a laminate having an aluminum foil layer, and the aluminum foil is heated by a high frequency coil. However, in the longitudinal direction of the body of a container formed from a laminate, there is a seam that is twice the thickness of the container material, which is created by joining the ends of the container material during container molding. When heated using a high-frequency coil, an electric circuit is formed in the circumferential direction of the aluminum foil layer at the seam, making it difficult to heat the seam and causing seal failures in the same area. It was hot.

The purpose of this invention is to provide a container heat sealing device that solves the above-mentioned problems.

Means for Solving the Problems The container heat sealing device according to this invention has a container body made of a laminate body, which has an aluminum foil layer and a seam that is twice the thickness of the container material in the longitudinal direction of the body. A device for heat-sealing the rising edge of a lid fitted into the mouth edge, the device comprising: a pressing means for pressing the opening edge and the rising edge from inside and outside; In a heat sealing device for a container, the heating means includes a high-frequency coil arranged on a container transport path by a container transport conveyor and formed in an annular shape at the edge of the container, and It is characterized by being equipped with a hot air injection nozzle that is placed in front of the upper high-frequency coil and has its injection port directed toward a part of the container body that is conveyed by the conveyor, including the joint at the mouth edge. .

Embodiment An embodiment of this invention will be described with reference to the drawings.

First, before explaining the device according to this invention, the container body and the lid attached to the mouth of the container will be explained with reference to FIGS. 6 and 7.

Although not shown in detail, the container body 1 is integrally constructed of a laminate having a thermoplastic synthetic resin layer, a paper layer, an adhesive layer, an aluminum foil layer, and a thermoplastic synthetic resin layer in order from the outside. , consisting of a body part 2 with a square horizontal cross section and a bottom closure part 3 which is folded flat. In the longitudinal direction of the body 2, there is a seam 4 that is twice the thickness of the laminate, which is created by overlapping and joining the ends of the laminate when forming the body 2 into a rectangular tube shape. . The lid 5 consists of an annular connecting frame 6 made of thermoplastic synthetic resin and a square top wall 7 made of a laminate having the same structure as the container 1. As shown in detail in FIG. 7, the annular connecting frame 6 includes a rising edge 8 for heat sealing and a rising edge 8 for heat sealing, which has a square horizontal cross section and is large enough to fit into the mouth edge of the container body 1. an inward flange 9 provided at the lower end of the inner circumferential surface of the container body and having the lower surface of the circumferential edge of the top wall 7 fixed to the upper surface; It has an outward flange 10 which abuts against the upper end of the container body 1 when the edge 8 is fitted. Furthermore, 4 of the annular connecting frame 6
An annular part 11 fixed to the back side of the top wall 7 is provided in one of the two corners along the part that is opened to become a drinking spout, and an opening is provided at the center of the annular part 11 in the width direction. A forming annular thin-walled portion 12 is provided, and a tension ring 13 is provided integrally with the inner side of the annular thin-walled portion 12 of the annular portion 11, the surface of the top wall 7 being warped.

FIG. 1 shows a container conveyor 14 and a heat sealing device disposed on its conveyance path. The container transport conveyor 14 includes a pair of left and right intermittent drive endless chains 15 and a large number of container holders 16 attached in the length direction of both chains 15. Container holder 16
consists of a pair of shallow U-shaped vertical pieces in plan view, which are attached outwardly to both chains 15 with a gap between them that can receive the container body 1, and which prevent the container body 1 from moving in the horizontal direction. is constrained, but its vertical movement is free. Beneath and parallel to the feeding side moving path of the container holder 16 is a rail 17 that receives and guides the bottom of the container body 1.
is located. These conveyor 14 and rail 17 convey the container body 1 and the lid 5 fitted to the mouth thereof in the direction of arrow A in the figure.

The heat sealing device includes a fixed pressing member 18 and four movable pressing members 19 arranged to surround the fixed pressing member 18 and having the same number as the corners of the lid 5.
, a square annular high-frequency coil 20 arranged around the fixed pressing member 18 , and the fixed pressing member 1
a container lifter 21 disposed below the container holder 16 on the moving path of the container holder 16; and a preheating heater disposed on the moving path of the container holder 16 in front of the container lifter 21 in the moving direction. It consists of 22.

The fixed pressing member 18 is attached downward via an annular plate 24 to a horizontal support plate 23 that straddles the moving path of the container holder 16 of the container conveyor 14. The upper half of the fixed pressing member 18 is an annular plate 2
4, but its lower half is attached to the annular plate 2.
4, and the outer circumferential surface of the protruding portion is formed into a square shape in plan view, similar to the inner circumferential surface of the rising edge portion 8 for heat sealing. Each movable pressing member 19 is movably held by a sliding guide member 25 in the shape of lip groove steel so that it can move toward and away from the fixed pressing member 18, and the direction of movement is determined by the direction of movement of the fixed pressing member 18. This is the diagonal direction of the square. Moreover, the direction intersects the container conveyance direction A by 45 degrees. The facing surface of each movable pressing member 19 forms a 90 degree angle in plan view with a part of the outer peripheral surface including one corner of the fixed pressing member 18.
The fixed pressing member 18 is formed in a square shape as a whole on the entire outer circumferential surface of the fixed pressing member 18 in the assembled state when approached. An elastic material 26 such as heat-resistant rubber is attached to the intermediate height of the facing surface of each movable pressing member 19. On the outside of each movable pressing member 19, there are four thin fluid pressure cylinders 2 of the same number as the movable pressing member 19.
7 are hung from the horizontal support plate 23 via brackets 29 with their respective piston rods 28 facing inward, and the piston rods 28 are connected to each movable pressing member 19, respectively. . As shown in FIG. 4, the high frequency coil 20 surrounds the fixed pressing member 18 at regular intervals and is attached to the lower surface of the annular plate 24 via a bracket so as to be positioned above the movable pressing member 19 when approaching. installed on. The container lifter 21 consists of a vertical lift tube 30 and a pedestal 31 fixed to the upper end of the vertical lift tube 30. The receiving stand 31 is arranged so as to fill the gap between the container receiving rails 17 provided in the part where it is placed.
The upper surface of the pedestal 31 is at the same height as the upper surface of the rail 17 when it is located at the lower limit of its vertical stroke. An elevating rod 32 is fitted into the vertical elevating tube 30 so as to be relatively movable. The upper end of the lifting rod 32 projects above the vertical lifting cylinder 30. A pair of racks 33 are provided on the protrusion,
A pair of container holding claws 35 having semicircular pinions 34 engaged with these racks 33 are swingably attached to the pedestal 31. Lifting rod 3
2 moves relative to the elevator tube 30, the rack 3
3 and the pinion 34, the container holding claws 35 swing and rotate in opposite directions to open and close. By pressing the bottom of the container main body 1 from both front and rear sides by the closed container holding claws 35, the attitude of the container main body 1 lifted by the pedestal 31 is stabilized. The preheating heater 22 is connected to a vertical hot air supply tube 36.
and a branch pipe 37 which is attached to the lower end of the hot air supply cylinder 36 and has two branch ports in the front and rear directions.
It consists of two hot air injection nozzles 38 connected to two branch ports, respectively. The two hot air jet nozzles 38 are mutually connected to the container holder 16 in the container conveying direction A.
They are arranged at intervals corresponding to one pitch of the intermittent transfer amount. Each hot air injection nozzle 38 has a fifth
As shown in detail in the figure, the container body 2 is made up of two bent pipes 40 extending downward from the union 39, and the two injection ports at the lower ends thereof face each other in the left and right direction, and the container body 2 is held by the container holder 16. It is directed toward the upper end of the seam 4 from both the inside and outside sides.

By the container conveyor 14, the container body 1 is transferred to the container lifter 2 with the lid 5 fitted to its mouth edge.
It is sent on top of 1. Prior to this, when the container body 1 approaches the preheater 22 in front of the container lifter 21, two hot air injection nozzles 38
By sequentially blowing hot air onto the upper end of the seam 4 of the container body 1 in two stages, the seam 4
Only the area is locally preheated. Then, when the container body 1 is sent onto the lifter 21, the lifter 21 is activated and the container body 1 is lifted.
The rising edge 8 of the lid 5 fitted into the opening fits into the outer peripheral surface of the fixed pressing member 18. Next, when each fluid pressure cylinder 27 is actuated and its piston rod 28 is projected all at once, each movable pressing member 19 moves in a direction approaching the fixed pressing member 18. As a result, the elastic material 26 of the movable pressing member 19 is pressed against the outer peripheral surface of the mouth edge of the container body 1 with the fixed pressing member 18 fitted into the inner peripheral surface of the rising edge 8, and as a result, the container Main body 1
The opening edge of the lid 5 and the rising edge 8 of the lid 5 fitted thereto are pressed together. In this state, the high frequency coil 20 is energized for a predetermined period of time to heat the aluminum foil by induction. Then, the thermoplastic resin layer on the inner surface of the mouth edge of the container body 1 and the thermoplastic synthetic resin that is the material of the rising edge 8 of the lid 5 are melted and heat-sealed to each other.

Effects of the invention According to this invention, since a high-frequency coil is used as the heating means, as mentioned at the beginning, the sealing time can be shortened compared to the case using a hot platen, and the hot air injection nozzle This makes it possible to preheat a portion of the container body, including the seam, at the mouth edge, thereby preventing the sealing failure caused by the use of the high-frequency coil mentioned at the beginning.

Further, since the heating by the high frequency coil and the hot air jet nozzle is performed sequentially while the container body and the lid are being conveyed by the conveyor, no additional heat sealing time is required.

[Brief explanation of the drawing]

Fig. 1 is a side view including a partial cross section showing an embodiment of this invention, Fig. 2 is an enlarged vertical sectional view taken along the - line in Fig. 1, and Fig. 3 is a horizontal sectional view taken along the - line in Fig. 2. , FIG. 4 is an enlarged vertical sectional view showing the main parts of the device according to this invention together with the container body and lid;
Figure 5 is an enlarged vertical sectional view taken along the - line in Figure 1, Figure 6 is a perspective view of the container body and the lid before it is applied, and Figure 7 is a partially enlarged view showing the container body with the lid applied. FIG. 1... Container body, 2... Body, 4... Seam, 5
... Lid, 8 ... Rising edge, 14 ... Container transport conveyor, 18 ... Fixed pressing member, 19 ... Movable pressing member, 20 ... High frequency coil, 23 ... Horizontal support plate, 25 ... Guide member , 27...Fluid pressure cylinder, 28...Piston rod, 38...Hot air injection nozzle.

Claims (1)

[Claims for Utility Model Registration] At the mouth edge of the container body 1 made of a laminate, which has an aluminum foil layer and has a seam 4 of twice the thickness of the container material in the longitudinal direction of the body 2, A device for heat-sealing the rising edge 8 of the fitted lid 5, which includes a pressing means for pressing the opening edge and the rising edge 8 from inside and outside, and heating the opening edge and the rising edge 8. In a container heat sealing device comprising a heating means, the heating means includes a high frequency coil 20 disposed on the container transport path by the container transport conveyor 14 and formed in an annular shape at the mouth edge thereof; A hot air injection nozzle 38 is arranged in front of the high frequency coil 20 of the container body 1 and has an injection port directed toward a part including the seam 4 of the mouth edge of the container body 1 conveyed by the conveyor 14. A heat sealing device for containers.