JP2000263636A - Method for insert molding of plug body for thin-wall container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thin-wall container having an inserted plug body which prevents dust or foreign matters from entering into a molded article before it is filled with contents, by making continuous a forming process from extrusion of a parison and shaping to takeout of a product with a blowing opening sealed. SOLUTION: In molding of a thin-wall container with a plug body such as an infusion solution bag, the plug body S is charged in a bottom driving device 151 driven by a servo motor. After a parison is put thereon and clamping is made, flashes of a product top part are cut by driving and compressed air is blown in for shaping from a blowing opening. After cooling, the product is removed from a mold 202. After the product M is taken out by a takeout device 251, burrs are punched off and the drum part is crushed to discharge air in the container. The blowing opening is heated by a heater and then welded. By this method, a forming process from extrusion of the parison and shaping to takeout of the product M with the blowing opening sealed is made continuous and thereby the thin-wall container having as an insert the plug body S which prevents dust or foreign matters from mixing in the product M is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a thin-walled container in which a plug is inserted by direct blow molding.

[0002]

2. Description of the Related Art In molding a thin plug such as an infusion bag into which a plug is inserted, burrs always appear on the upper and lower parts of the product because the plug is inserted. In order to remove the burrs, the operator loads the product into another device and removes it with a knife or the like after the product is taken out. In addition, the parison of the thin container is naturally thin, and the resin extruded from the die head swells due to viscoelasticity and adheres to the lower surface of the die. For this reason, when starting up, the operator starts up while removing the adhered resin. In addition, when the thin parison is extruded from the die, the parison diameter increases due to the parison swell, but as the extrusion continues, the parison shrinks due to its own weight and temperature decreases, causing a curting phenomenon and causing a crease. It becomes a shape and hinders formability.

[0003]

However, manual intervention in the molding process not only does not provide stability in quality, but also has a problem in hygiene. In addition, measures must be taken to prevent the entry of dust, foreign matter, and the like during transportation to the next step.

[0004] Further, at the time of molding start-up and after start-up after trouble recovery, an operator removes the parison attached to the lower surface of the die until the thin parison normally starts up. There is a problem. In addition, this parison is not a round cross section, it becomes a star-shaped parison with more than ten folds,
If this is sandwiched between molds and inflated, the uniformity of the thickness of the welded portion with the vertical streak and the plug will be impaired.

[0005] Therefore, the present invention enables an unskilled person to start up a thin parison at the start of extrusion, safely and efficiently, and perform stable molding of product quality. An object of the present invention is to obtain a thin container in which a plug is inserted so that dust and foreign matter do not enter the molded product before filling the contents.

[0006]

In order to achieve the above object, according to the present invention, in forming a thin container with a plug such as an infusion bag, a plug is inserted into a lower driving device driven by a servomotor. After filling the body, covering it with a parison and closing the mold, cut the burr out of the product mouth, insert compressed air from the blow hole, shape it, take it out of the mold after cooling, and take out the product with the unloading device After taking out, punch out the burr,
By squeezing the body, discharging the air in the container, heating the inlet with a heater and fusing it, forming from parison extrusion, sealing the inlet and taking out the product in a continuous process, the container It is characterized by obtaining a thin-walled container in which a plug is inserted, in which dust and foreign matter do not enter.

According to the second aspect of the present invention, after the plug is loaded into the lower driving device driven by the servo motor, the lower driving device is raised from the plug body cut position and inserted into the parison. After sealing the lower part of the parison with, the lower driving device is lowered at substantially the same speed as the parison extrusion speed while inflating the parison by pre-blowing, thereby obtaining a parison free of wrinkles (curting phenomenon).

Further, according to the present invention, in forming a thin-walled container, the gap of the die core at the start of the operation of the extruder is made wider than the normal operation state, and the parison at the start of the extrusion curls to lower the die. It is characterized in that it does not adhere to the surface.

Therefore, even an unskilled person can quickly and easily,
A thin-walled container with a plug inserted can be obtained, which can be started up efficiently and is free from dust and foreign matter even in the process before filling.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an apparatus shown in the drawings. As shown in FIGS. 1 to 4, the stopper S supplied to the stopper receiving position 12 by the stopper supply device (not shown) is gripped by the stopper chuck arm 55 of the stopper insert device 51, and servo is performed. The ball screw is driven by the motor 56, and is moved directly above the anvil table 152 of the lower driving device 151 of the molding machine 101 by a slide mechanism (not shown) that moves via a guide rail. Here, the lower driving device 15
1 through the timing pulley 155 and the timing belt 154 to drive the ball screw 1.
By rotating 56, the anvil table 152 is raised to the position for receiving the plug S, and the plug S is suction-fixed to the anvil table 152. The plug chuck arm 55 opens,
It retracts to a position where it does not interfere with the anvil table 152.

The lower driving device 151 is further raised, and the stopper S is inserted into the parison P together with the anvil table 152, and the parison seal arm 52 of the plug body insert device 51 is closed after the lower end of the parison is covered by the anvil table 152. , The bottom of the parison P is sealed, and the lower driving device 151 is lowered at substantially the same speed as the extrusion speed of the parison P.
By inflating the pre-blow air inside,
Extrude while removing the wrinkles of Parison P. After the plug insert device 51 opens the parison seal arm 52,
It returns to the plug receiving position 12.

After lowering the lower driving device 151 to the driving standby position, the servo motor (not shown) of the mold clamping device 201 is used.
When the mold 202 is closed, the parison P is cut by a cutter almost at the same time, and the burr upright cylinder (not shown) on the upper portion of the mold is closed to crush the burr and stand up. The lower driving device 151 raises the parison almost at the same time as cutting the parison, cuts the burrs around the blowing port and the plug body, injects blow air from the blow pin 159 to inflate the parison P, and obtain a product along the cavity. Can be.

Further, after the mold 202 is closed, the slide mechanism of the mold clamping device 201 moves the parison to the right from the extrusion position and cools the product M in the mold 202. The upper burr 252 standing up by the product take-out arm 253 is clamped. After the blow air of the product M cooled in the mold 202 is exhausted and the lower driving device 151 is slightly lowered to make it easier to pull out the blow pin 159, the mold clamping device 201 is driven to open the mold 202 and perform lower driving. After the apparatus 151 is lowered to the lower fixed point and the blow pin 159 is removed from the product M, the servo motor 255 of the extracting device 251 is driven to move the product M to the punching position.

Further, as shown in FIGS. 5 to 9, the product M transferred to the punching device 301 by the unloading device 251 is
By driving the rod 300 of the product holder cylinder 303 shown in FIG. 6 in the contracting direction, the tuning rack 30 shown in FIG.
The product is held while synchronizing the opening and closing operations of the pair of product holders 302 via the pinion 4 and the pinion 305. Thereafter, the punching cylinder 306 is advanced to punch out the upper burr, the lower burr, and the suspension burr. The transfer cylinder 361 advances to the punching position almost simultaneously with the product hold, and the product body after punching out the burrs is fixed by suction with the suction pad 362, and after the product holder 302 is opened,
It is transferred to the inlet seal device 351.

The product M transferred to the blow-in port sealing device 351 is a product-portion chuck cylinder 353 shown in FIG.
Then, the hanging hole positioning cylinder 363 is advanced, and the mouth is clamped by the product mouth chuck 352. Transfer cylinder 3
Numeral 61 releases the suction and advances again to move to the punching position. At the position where the transfer cylinder 361 is advanced, and at the blowing port sealing position, the body clamp cylinder 360 is advanced to reduce the internal volume of the product, and presses the product body.
In this state, the plug burr heater 354 and the blow-out port heater 355 shown in FIG. 7 are raised by the heater vertical cylinder 356 to thermally melt the beard burr around the plug, and then descend after heating the blow-up port. The injection port seal cylinder 357 shown in FIG.
8. Seal the inlet. After the sealing, the opening seal mold 358 is opened, and the cover cap welding device 401 is moved by the transfer cylinder 361 while the body of the product is clamped.
Will be transferred to After the cover cap is welded, the product M is adsorbed, transferred by the transfer cylinder 361 to the position of the product discharge shooter 501 shown in FIG.

Further, according to FIG. 10, the thickness of the parison is adjusted by adjusting the gap between the die 602 and the core 603 of the parison P forming portion of the head 601. In the case of a thin parison, the gap between the die 602 and the core 603 is very small. Therefore, at the start of the parison extrusion, the resin adheres to the lower surface of the die 602, which hinders the start of molding. For this reason,
At the end of molding, a command is sent from the programmable controller 611 to the servo amplifier 613 in the direction in which the gap between the die 602 and the core 603 becomes wider, the servo motor 614 is rotated, the core is moved via the ball screw 616, and the extruder is stopped. At the start of molding, a thick parison is extruded so that the resin does not adhere to the lower surface of the die 602.

[0017]

According to the present invention described above, the molding from the parison extrusion to the shaping until the product is taken out while sealing the blowing port is performed in a continuous process, and the plug is free from dust and foreign matter. Is obtained.

Further, after the plug is loaded into the lower driving device driven by the servomotor, the plug of the lower driving device is raised from the cut position of the product mouth and inserted into the parison. In this state, the lower portion of the parison is sealed. After that, while the parison is inflated by pre-blowing, the driving device is lowered at a speed substantially equal to the parison extrusion speed, whereby a parison free of wrinkles (curting phenomenon) is obtained and the product quality is improved.

In forming a thin-walled container, the clearance of the die core at the time of starting the operation of the extruder is made wider than that in the normal operation state so that the parison at the time of starting the extrusion does not curl and adhere to the lower surface of the die. Even a skilled person can start up quickly, easily and efficiently, and can obtain a thin-walled container with a plug inserted therein, which is free from dust and foreign matter even in the step before filling.

[Brief description of the drawings]

FIG. 1 is a front view of a molding machine embodying the present invention.

FIG. 2 is a diagram showing the relationship between a plug insert device and a molding machine lower driving device.

FIG. 3 is a detailed view of an anvil table of the lower driving device of FIG. 2;

FIG. 4 is a detailed view of an extraction device.

FIG. 5 is a front view of the punching device.

FIG. 6 is a side view of the punching device of FIG. 5;

FIG. 7 is a side view of a blow-out port seal portion.

FIG. 8 is a front view of the blow-out port seal part of FIG. 7;

FIG. 9 is a side view of the cover cap sealing device.

FIG. 10 is a configuration diagram of a parison thickness controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Plug receiving position 51 ... Plug insert device 52 ... Parison seal arm 55 ... Plug chuck arm 101 ... Molding machine 151 ... Lower driving device 152 ... Anvil table 153 ... Servo motor 154 ... Timing belt 155 ... Timing pulley 156 ... Ball screw 159 ... Blow pin 201 ... Molding device 202 ... Mold 251 ... Ejecting device 252 ... Upper burr 253 ... Product extracting arm 255 ... Ejecting device servo motor 301 ... Punching device 302 ... Product holder 303 ... Product holder cylinder 304 ... Synchronizing rack 305: Pinion 306: Punching cylinder 351: Inlet sealing device 352: Product opening chuck 353: Product opening chuck cylinder 354: Plug body burr heater 355: Inlet heater 356: Heater vertical cylinder 357 Blow-in seal cylinder 358 Blow-in seal die 360 Body clamp cylinder 361 Transfer cylinder 362 Suction pad 363 Hanging hole positioning cylinder 401 Cover cover welding device 501 Product discharge shooter 601 Head 602 Dice 603 ... Core 611 ... Programmable controller 613 ... Servo amplifier 614 ... Servo motor 616 ... Ball screw P ... Parison S ... Plug body M ... Product

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Claims (3)

[Claims] In forming a thin-walled container with a plug such as an infusion bag, a plug is loaded into a lower driving device driven by a servomotor, a parison is put on the plug, and a mold is clamped. The mold is opened after cooling, the mold is opened, the product is taken out by the take-out device, the burr is punched out, the body is crushed, and the air in the container is discharged. After heating with a heater and welding, the molding process was performed in a continuous process from forming the parison extruder to sealing the blowing port and taking out the product, and a plug was inserted to prevent dust and foreign matter from entering the container. A method for forming a thin container. 2. A plug body is loaded into a lower driving device driven by a servo motor, and then the lower driving device is raised from a cut portion of a plug opening and inserted into a parison, and a lower portion of the parison is sealed here. Thereafter, a lower-punching device is lowered at substantially the same speed as the parison extrusion speed while inflating the parison by pre-blowing, thereby eliminating the parison wrinkles (curtaining phenomenon). 3. The molding of a thin-walled container, in which the gap of the die core at the start of the operation of the extruder is made wider than the normal operation state, so that the parison at the start of the extrusion does not curl and adhere to the lower surface of the die. A plug insert molding method for a thin container.