JPH0544803U - Resin container sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the occurrence of sealing defects such as burning when heat-sealing the open end side of a resin container, and shorten the heating time. [Structure] An airtight box 23 that covers the respective sealing devices 21 and 22 is provided on the outer peripheral side of each of the sealing devices 21 and 22, and the airtight box 23 is filled with an inert gas such as nitrogen gas. Therefore, the nitrogen gas in the airtight box 23 eliminates the oxygen atmosphere from the surroundings of the sealing devices 21 and 22, and the open end of the tube made of a resin material such as polyethylene at the heating station B of each of the sealing devices 21 and 22. Even if the opening end side is heated to 180 ° C. or higher when the side is heated by the sheath type heater,
This heat prevents the pressure-bonded portion on the open end side from being burnt due to thermal decomposition.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device for a resin container suitable for sealing the opening of a resin container made of polyethylene or the like filled with a creamy substance such as facial cleansing cream.

[0002]

[Prior Art]

 3 to 7 will be described with reference to an example in which a conventional resin container sealing device is used in a filling line for filling a resin tube with a creamy substance.

In the figure, reference numeral 1 denotes a tubular shape formed of a thermoplastic resin material such as polyethylene, one end side of which is a mouth portion (not shown), and the other end side is an open end 1A for filling a creamy substance such as a face-wash cream. Is shown, and a cap 1B for sealing the mouth is attached to the mouth of the tube 1.

As shown in FIGS. 4 and 5, 2 is a filling line for filling the tube 1 with a creamy substance, 3 is a pedestal which is a base of the filling line 2, and on the pedestal 3, A loading device 4, a transfer device 5, a filling device 6, sealing devices 7, 8 and the like, which will be described later, are provided.

Reference numeral 4 denotes a charging device arranged on the pedestal 3. The charging device 4 feeds the tube 1 to the chute plates 4A, 4A provided on both sides thereof in a rollover state. It is continuously charged into each cup holder 5A of the carrying device 5 described later with the open end 1A facing upward.

Reference numeral 5 denotes a transfer device arranged in the center of the gantry 3, and a large number of bottomed cylindrical cup holders 5A, 5A, ... Are provided on the outer peripheral side of the transfer device 5. When the tube 1 is loaded into each cup holder 5A by the loading device 4, the transporting device 5 carries out the tube 1 intermittently and sequentially transports it in the counterclockwise direction.

Reference numeral 6 denotes a filling device disposed in the middle of the carrying device 5, and when the tube 1 carried by the carrying device 5 is stopped at the filling position, its filling nozzle 6 A, The creamy substance is discharged from 6A and filled in the tube 1.

Reference numerals 7 and 8 denote two sealing devices disposed in the middle of the transport device 5 at an upstream position and a downstream position on the downstream side of the filling device 6, and as shown in FIG. The gripping mechanism which comprises a part of each said sealing device 7,8 is shown, Each said gripping mechanism 9 is arrange | positioned in the center, and the cam disk 10 in which the inner cam 10A was formed in the outer peripheral side, and this cam disk. .. (only one is shown) which are arranged radially outward from the outer peripheral side of 10 and are arranged in large numbers at predetermined intervals in the circumferential direction.

Here, each of the gripping arms 11 is fixed to a rotating frame (not shown) of each of the sealing devices 7 and 8 and has a T-shape having a through hole 12A formed in the axial direction. The fixed grip portion 12 and the fixed vice 13 which is separated from the tip side of the fixed grip portion 12 by a predetermined distance and is fixed to the fixed grip portion 12 via a pair of rods 13A and 13A, and the fixed grip portion 12 described above. The movable vise 14A is loosely fitted in the through hole 12A so as to be movable in the axial direction, and the moving vise 14A is attached to the tip side thereof, and the cam roller 14B which is engaged with the inner cam 10A of the cam disk 10 while rotating is attached to the base end side thereof. The movable grip 14 is provided between the movable grip 14 and the fixed grip 12, and the movable vice 14A of the movable grip 14 is urged toward the fixed vice 13 to open the open end of the tube 1. 1A side And a spring member 15 for gripping.

The gripping mechanism 9 is configured such that the gripping arms 11 rotate around the cam board 10 in the directions indicated by arrows R and L in FIG. 4, respectively, so that the inner cams of the cam board 10 are rotated. Depending on the shape of the 10A, the space between the fixed vise 13 and the moving vise 14A of the moving grip 14 is expanded or contracted, so that the open end 1A side of the tube 1 can be gripped or released. ing.

In each of the sealing devices 7 and 8 configured as described above, when the tube 1 filled with the creamy substance by the filling device 6 is conveyed by the conveying device 5, as shown in FIG. At the grip station A, the open end 1A side of the tube 1 is gripped, the tube 1 is pulled out from the cup holder 5A, and in this state, the grip arm 11 is rotated in the directions of arrows R and L, respectively. As a result, the open end 1A side of the tube 1 is heated to 130 to 170 ° C. by the heating means such as a sheath type heater in the heating station B to be melted, and is compressed in the pressure bonding station C in this molten state. Then, the tube 1 having the opening end 1A side pressure-bonded thereto is solidified by a cooling means such as an air blow at the cooling station D at the cooling station D, and then the grip is released at the discharge station E, as shown in FIG. The tube 1 whose open end 1A side is sealed by the crimping portion 16 is discharged onto each of conveyors 17 and 18 described later.

Reference numerals 17 and 18 denote conveyors arranged below the discharge station E of the respective sealing devices 7 and 8. Each of the conveyors 17 and 18 is filled with a cream-like substance, and has an opening end 1A. The tube 1 whose side is sealed by the crimping portion 16 is sequentially conveyed toward the subsequent steps such as the packing step.

The filling line 2 according to the prior art has the above-mentioned configuration, and when each chute plate 4A of the charging device 4 is manually supplied with the tube 1 having the open end 1A at the other end, The tube 1 is loaded by the loading device 4 into the cup holder 5A of the transport device 5 so that its open end 1A is located above, and is transported by the transport device 5 to the filling position of the filling device 6. As a result, the inside of the tube 1 is filled with a predetermined amount of cream-like substance through each filling nozzle 6A of the filling device 6. Then, the tube 1 having the creamy substance filled therein is again conveyed by the conveying device 5 to the grasping position by the grasping station A of each of the sealing devices 7 and 8, and grasped by each grasping arm 11 of the sealing devices 7 and 8. Then, it is removed from the cup holder 5A. Here, the tube 1 is discharged onto the respective conveyors 17, 18 after the opening end 1A side thereof is sealed by the respective sealing devices 7, 8, and by the respective conveyors 17, 18 in a packing process or the like. It is transported to the subsequent process.

[0014]

[Problems to be solved by the device]

 By the way, according to the above-mentioned conventional technique, the open end 1A side of the tube 1 made of a resin material such as polyethylene is heated to 130 to 170 ° C. (polyethylene resin) by a sheath type heater provided in the heating station B of each sealing device 7, 8. After melting to a melting temperature of 120 or more) and then melting at the pressure bonding station C, the opening end 1A side is pressure-bonded in the molten state, and the opening end 1A side is sealed by the pressure-bonding portion 16 and the inside of the tube 1 is closed. The cream can be sealed.

Further, in the recent filling line 2, it is attempted to increase the line speed in order to improve the productivity, and the heating time in the heating station B of each sealing device 7, 8 can be shortened. Is desired.

However, in the heating station B described above, if the heating temperature of the sheath type heater is increased and the opening end 1A side of the tube 1 is heated within a short time, the temperature on the opening end 1A side becomes unsatisfactory. It tends to be stable, and as a result, the temperature on the open end 1A side of the tube 1 is too low, causing unsealing due to insufficient melting, and if the temperature on the open end 1A side is too high, the pyrolysis temperature (180 ° C) is reached. As shown in FIG. 7, there is a case where defective bonding such as the focusing portion 19 due to the oxidation action is caused by the bonding with oxygen in the atmosphere, and the yield is greatly reduced due to poor quality such as defective sealing. There is.

The present invention has been made in view of the above-described problems of the prior art, and prevents a sealing failure such as a burning when an opening end side of a resin container is heat-welded to shorten a heating time. An object of the present invention is to provide a sealing device for a resin container that can be shrunk.

[0018]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention to solve the above-mentioned problem is that at least a heating station and a crimping station are provided with an airtight box covering the heating station and the crimping station, and the inert gas is filled in the airtight box. It has been configured to do.

[0019]

[Action]

 With the above configuration, the inert gas filled around the heating station and the crimping station is prevented from causing an oxidizing action, and even if the opening end side of the resin container becomes hot, the opening end side is thermally decomposed. Prevents scorching.

[0020]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the embodiments, the same components as those of the prior art shown in FIGS. 3 to 7 described above are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numerals 21 and 22 denote sealing devices according to the present embodiment, and the respective sealing devices 21 and 22 are the gripping station A and the heating station B, like the sealing devices 7 and 8 described in the prior art. Although it is composed of a pressure bonding station C, a cooling station D, and a discharge station E, an airtight box 23, which will be described later, is provided on the outer peripheral side of each of the sealing devices 21 and 22.

Reference numeral 23 denotes an airtight box arranged so as to cover the outer peripheries of the respective sealing devices 21 and 22, and the airtight box 23 is made of a transparent plate material such as vinyl chloride as shown in FIG. It is formed in a shape and is fixed to each of the sealing devices 21 and 22 by a bolt (not shown). In addition, on the lower surface of the airtight box 23, there are supply ports that circulate when the tube 1 moves from the transporting device 5 into the respective sealing devices 21 and 22, and from the respective sealing devices 21 and 22 to the conveyors 17 and 18. And discharge ports (both not shown) that are circulated when they are discharged to the inside.

One end of 24 is connected to the airtight box 23, and the other end is connected to a curdle (not shown) filled with an inert gas such as nitrogen gas or carbon dioxide gas (hereinafter referred to as nitrogen gas). The supply pipe 24 supplies the nitrogen gas in the curdle into the airtight box 23.

The filling line 2 according to the present embodiment has the above-described configuration, and the basic operation thereof is not particularly different from that according to the prior art.

However, in the present embodiment, an airtight box 23 that covers the respective sealing devices 21 and 22 is provided on the outer peripheral side of each of the sealing devices 21 and 22, and an inert gas such as nitrogen gas is placed in the airtight box 23. It was configured to fill. Therefore, the nitrogen gas in the airtight box 23 eliminates the oxygen atmosphere from the surroundings of the sealing devices 21 and 22, and the tube 1 made of a resin material such as polyethylene is heated at the heating station B of each of the sealing devices 21 and 22. When the open end 1A side is heated by a sheath type heater, even if the open end 1A side is heated to 180 ° C. or higher, the heat causes the crimped portion 16 on the open end 1A side to be focused by the pyrolysis. It is possible to reliably prevent the occurrence of.

Thus, according to the present embodiment, even if the open end 1A side of the tube 1 is heated to the pyrolysis temperature or higher, it is ensured that the crimping portion 16 on the open end 1A side will suffer sealing failure such as focusing. Can be prevented, and the yield can be significantly improved. Further, due to the above effect, the upper limit of the temperature range when heating the open end 1A side of the tube 1 can be increased, so that even if the heating temperature by the sheathed heater is increased and the heating time is shortened, this At this time, variations in the temperature on the side of the opening end 1A can be allowed, and by shortening the heating time in the heating station B, the line speed can be increased and the productivity can be greatly improved.

In the above embodiment, the case where the tube 1 made of a resin material such as polyethylene is used as the resin container and the inside of the tube 1 is filled with a face-wash cream as a creamy substance has been described. The present invention is not limited to this, and for example, polypropylene or the like may be used as the resin material, and food such as kneaded mustard may be filled as the creamy material.

Further, in the above-described embodiment, the airtight box 23 is described as being formed in a box shape by using a plate material such as transparent vinyl chloride, but instead of this, for example, acrylic resin, glass, or the like may be used. The shape may not be limited to the box shape, and may be opaque. In this case, since the nitrogen gas is always supplied, the airtight box 23 does not have to be a completely closed container, and the airtight box 23 may be open near the supply port and the discharge port.

Further, in the above-described embodiment, the airtight box 23 is illustrated as collectively covering the respective sealing devices 21 and 22, but the present invention is not limited to this, and for example, the respective sealing devices 21 and 22 are separately provided. Alternatively, the entire filling line 2 or only the heating station B and the crimping station C may be covered.

Further, in the above-mentioned embodiment, the case where nitrogen gas or carbon dioxide gas is used as the inert gas has been described as an example, but other inert gas may be used.

Further, in the above-mentioned embodiment, the heating station B of each of the sealing devices 21, 22 is described as using a sizing type heater, but the present invention is not limited to this, and for example, an ultrasonic heater or the like. Other heaters (heating means) may be used.

[0032]

[Effect of the device]

 As described in detail above, according to the present invention, an airtight box for covering the heating station and the crimping station is provided at least on the outer peripheral side of the heating station and the crimping station, and the inert gas is filled in the airtight box. Therefore, when the opening end side of the resin container is heated at the heating station, it is possible to prevent the opening end side of the resin container from being thermally decomposed and burned due to the oxidation effect due to overheating. The upper limit of the temperature range when heating the side can be increased. As a result, even if the heating end side of the container is heated in a short time at the heating station and the temperature at the opening end side becomes unstable and variations occur, this variation can be tolerated, and it can be done in a short time. It is possible to increase the line speed by enabling heating on the open end side of the, and improve productivity and yield.

[Brief description of drawings]

FIG. 1 is a plan view showing a filling line according to an embodiment of the present invention.

FIG. 2 is a side view showing a filling line in FIG.

FIG. 3 is a perspective view showing a tube before sealing according to a conventional technique.

FIG. 4 is a plan view showing a filling line according to a conventional technique.

5 is a side view showing the filling line in FIG. 4. FIG.

FIG. 6 is an enlarged plan view showing a gripping mechanism.

7 is a perspective view showing a state in which the open end side of the tube in FIG. 3 is sealed.

[Explanation of symbols]

 1 tube (container) 1A open end 21,22 sealing device A gripping station B heating station C crimping station E discharge station 23 airtight box

Claims (1)

[Scope of utility model registration request] 1. A container gripping station for gripping an open end side of a resin container having one opening for filling contents, and an open end side of the container is heated while the container is gripped at the container grip station. And a heating station that melts
A resin container comprising a crimping station for pressing and crimping the open end side of the molten container at the heating station, and a discharge station for releasing the gripped state of the container whose open end side is sealed at the crimping station and discharging the container. In the sealing device, at least the heating station and the pressure bonding station are provided with an airtight box covering the heating station and the pressure bonding station, and the airtight box is filled with an inert gas. Container sealing device.