JPS6213924Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a heat sealing device for a container, in particular a device for heat sealing the rising edge of a polygonal lid to the mouth edge of a container body into which the lid is fitted. .

Conventional technology and its problems This type of device, for example,
As disclosed in Japanese Patent No. 12276, this is a molding device for heat-sealing the sealing portion of a hexagonal closure member inserted into the end of a sleeve, which has a mandrel and three a combination mold comprising a mold, the mandrel being introduced into and snugly engaged with the closure member, the mold being shaped to fit around the end of the sleeve and applying pressure to the sleeve; The end of the sleeve and the sealing part of the closing member are moved between the mold and the mandrel, and the mold is heated to seal the sealing part to the sleeve. There are the following problems. In this conventional device, since there are three molds for the hexagonal closing member, three half corners of the six corners of the closing member are firmly pressurized by the three molds. However, the remaining three corners will be pressurized by the mating surfaces of the three molds, which may result in poor pressurization, which may cause sealing defects in the same portions.

Furthermore, the means for moving the mold was previously proposed by the applicant (Japanese Unexamined Patent Publication No. 59-15007).
(see Japanese Patent Publication No. 2003-11101), it is known that a fluid pressure cylinder is used as a drive source and this and the mold are connected by mechanical means including a parallelogram mechanism.
This is true if the number of molds is about two, but if the number is more than that, the structure of the mechanical means becomes complicated.

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 is a device that heat-seals the rising edge of a polygonal lid to the mouth edge of the container body into which it is fitted. The pressing means includes a pressing means that presses the edge and the mouth from inside and outside, and a heating means that heats the rising edge and the mouth. It is equipped with a movable pressing member and a fluid pressure cylinder that horizontally moves each movable pressing member so as to approach and separate each movable pressing member from the fixed pressing member, and the outer peripheral surface of the fixed pressing member is The movable pressing member has a polygonal shape formed on its inner peripheral surface, and the opposing surface of the movable pressing member is V-shaped when viewed from above, and when the movable pressing member is brought into contact with the movable pressing member in the mated state, the entire fixed pressing member has a polygonal shape formed on its outer peripheral surface. In the container heat sealing device, a fixed pressing member is attached to the lower surface of the horizontal support plate, the number of movable pressing members and fluid pressure cylinders is the same as the number of corners of the lid, and each movable pressing member is attached to the bottom surface of the horizontal support plate. The guide member provided on the lower surface supports the fixed pressing member so as to be movable in the direction connecting the center of the polygon formed by the outer circumferential surface of the fixed pressing member and each corner thereof when seen from a plane, and one fluid pressure cylinder is provided on the outside of the movable pressing member. The pistons and pistons of each hydraulic cylinder
It is characterized in that the rod is connected to a movable pressing member located inside the rod.

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 movement path of the container holder 16 of the conveyor 14. The upper half of the fixed pressing member 18 is fitted into the annular plate 24, but its lower half protrudes below the annular plate 24, and the outer peripheral surface of the protruding portion serves as a rising edge for heat sealing. 8, it is formed into a square shape in plan view. 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. In addition, the direction is the container transport direction A and 45
It's crossing over. The facing surface of each movable pressing member 19 is V-shaped and forms an angle of 90 degrees when viewed from above, just like a part of the outer peripheral surface including one corner of the fixed pressing member 18, and is fixed as a whole when brought together when approaching. The entire outer peripheral surface of the pressing member 18 is formed in a square shape. 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, the same number of four thin hydraulic cylinders 27 are suspended from the horizontal support plate 23 via brackets 29 with their respective piston rods 28 facing inward. 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 with a certain gap 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 is a vertical lifting cylinder 30
and a pedestal 31 fixed to the upper end of this. The pedestal 31 is arranged so as to fill the gap between the container holder rails 17 provided in the part where it is disposed, and when the container pedestal 31 is at the lower limit of its vertical stroke, the top surface of the pedestal 31 is The height is the same as the top surface of the rail 17. 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, and a semicircular pinion 34 is engaged with these racks 33.
A pair of container holding claws 35 are swingably attached to the pedestal 31. When the lifting rod 32 moves relative to the lifting tube 30, the container holding claws 35 swing and rotate in opposite directions via the rack 33 and pinion 34 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 attached to a vertical hot air supply cylinder 36 and a vertical hot air supply cylinder 36, and two
It consists of a branch pipe 37 having two branch ports, and two hot air injection nozzles 38 respectively connected to the two branch ports. The two hot air injection nozzles 38 are arranged at intervals corresponding to one pitch of the intermittent transfer amount of the container holder 16 in the container transport direction A. As shown in detail in FIG. 5, each hot air injection nozzle 38 is composed of two curved 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 are connected to the container holder 16. It is directed toward the upper end of the joint 4 of the container body 2 which is held in the container body 2 from both the inner and outer sides thereof.

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 to the opening edge
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, the rising edge of the lid and the mouth edge of the container body are pressed from the inside by a fixed pressing member, and from the outside by the same number of movable pressing members. Since all corners of the lid are reliably pressed by each movable pressing member, the problem of seal failure occurring at the corners can be solved.

In addition, in order to move each movable press member closer to and away from the fixed press member, each movable press member is actuated by a separate fluid pressure cylinder, so as mentioned at the beginning, each press member is mechanically operated. Compared to the case where the device is actuated by manual means, the structure of the device is simpler, and the pressing force by the pressing member can be easily adjusted and made uniform.

[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] A device for heat-sealing the rising edge 8 of a polygonal lid 5 to the mouth edge of a container body 1 into which it is fitted, the rising edge 8 and the mouth edge The pressing means consists of a pressing means for pressing from the inside and outside, and a heating means for heating the rising edge 8 and the mouth edge, and the pressing means includes a fixed pressing member 18 and a plurality of movable pressing members surrounding the fixed pressing member 18. Part 19
and each movable pressing member 19 with respect to the fixed pressing member 18.
and a fluid pressure cylinder 27 for horizontally moving each movable pressing member 19 so as to approach and separate them, and the outer peripheral surface of the fixed pressing member 18 is formed in a polygonal shape similar to the inner peripheral surface of the rising edge 8. In a heat sealing device for a container, the facing surface of the movable pressing member 19 is V-shaped when seen from a plane, and the entire outer peripheral surface of the fixed pressing member 18 is formed in a polygonal shape in the mated state when approaching. The member 18 is attached to the lower surface of the horizontal support plate 23 , the number of movable pressing members 19 and the hydraulic cylinders 27 is the same as the number of corners of the lid 5 , and each movable pressing member 19 is attached to the lower surface of the horizontal support plate 23 . The fixed pressing member 19 is supported movably in a direction connecting the center of the polygon formed by the outer circumferential surface of the fixed pressing member 19 and each corner thereof when viewed from the plane by the provided guide member 25, and the fluid pressure cylinder 2
7 are arranged inwardly on the outside of the movable pressing member 19 and attached to the lower surface of the horizontal support plate 23, and the piston rod 27 of each hydraulic cylinder 27 is connected to the movable pressing member 19 located inside thereof. A container heat sealing device characterized by: