KR840001588B1 - Apparatus for producing moled plastic articles such as packaging tubes - Google Patents

Abstract

Moulded article is produced by shaping an extrudate into a lenticular oval cross-section profile by controlling the flow from an extrusion head, sepg. the shaped blank from the head and allowing it to fall into a pin in a mould with minimal contact with the mould wall and closing the mould to finally shape the aritcle by pressing. The blank is pref. separated from the extrudate by an air blast. Premature crystallization is avoided.

Description

Molding apparatus for plastic packaging container

1 is an improved plan view of an extrusion machine in which a pressing die is placed on a swivel table.

FIG. 2 is a partial side view of the swivel having a pressing die, partially cut along the line II-II of FIG.

FIG. 3 is an enlarged model view of the press die portion of FIG. 2 showing a state before the blank formed by the material feed head is separated.

The present invention relates to a molding apparatus for manufacturing a tub for use as a fluid packaging container by pressing a plastic plastic material into a molding space.

The press method is known as an alternative to the injection molding method in order to manufacture a molded article made of plastic such as a container lid or stopper and to produce a head piece of a patent packaging container (tub).

In the pressing method, unlike the injection molding method, a limited pressure is used to press the plastic plastic material into the molding space.

Since pressurization methods can generally be carried out using a lower temperature plastic plastic material than injection molding can use, these methods have the advantage of shorter cooling times, in addition to the fact that they can use lower energy, and as a result The advantage is that the molding machine (mould) can be opened in a timely manner and the step of emptying the molding space during the manufacturing process can be shortened accordingly.

In the known pressurization method, a molding machine consists of a die and a shaft, which shaft always supports a plastic tubular material (tubing) material. One end of this tubular material (tubing) material is inserted into the die together with the shaft to close the molding space on the circumference of the shaft when closing the molding machine. The plastic plastic molded into the head piece shape for the tubular container is joined with the distal end of the tubular container material inserted into the molding machine under the heat melting conditions.

In a known method, the plastic plastic is introduced into the molding machine space which is still open through the center opening from the opposite side of the shaft or discharged from the annular material supply head by the material supply head. The plastic material bonded to the annular material feed head separates when the material is withdrawn from the molder space through the die and then continues to adhere to the surface adjacent to the molder space until the pressurization process begins.

In some cases, defects appear in the container (tubing) product according to this known device, some of which can be seen directly on the surface.

Observations of the processes involved in the pressurization resulted in limited crystalline conditions in the plastic material that are in direct contact with the cooled die and shaped by a matrix during removal from the material feed head. I found out.

The plastic material is adjacent the die cover over the surface. As a result of the continuous cooling that occurs during the pressurization process, the heat of the melt is not enough to replasticize the material that has already crystallized.

According to the present invention, when a given material is removed from the material feed head, contact is made with a cooled mockup comprising a relatively large surface which causes the contact surface to cool relatively large until the molding machine is sealed and the plastic is warmed up. Results.

It is an object of the present invention to provide an apparatus in which early crystallization of a plastic material can be largely prevented without raising the temperature of the plastic discharged from the material feed head.

The object of the present invention is to provide a plurality of molding dies having up-opening molding spaces in which internal molding surfaces are formed, at working positions around a swivel table where each working position is designated and arranged at the same angle in an equiaxed ring, and each molding A plurality of pressure inlets which are operated in a horizontal position from a horizontal position simultaneously with the rotation of the swivel while forming one jaw with the die are configured at one end of the support shaft via the support interval fixed to the connecting side fixed to the pivoting portion. Combining a series of interlocking members for continually operating each indentation periodically between the horizontal position and the vertical position, and in the molding space from the vertical position in a timely manner when the inlet is restored to the horizontal position in accordance with the rotation of the swivel Two extruded material feeders consisting of conduits, annular nozzles and sealing members for drop feeding blanks of heated plastic material The hayeoseo a configuration that can be achieved by a molding apparatus of a plastic packaging container (probe tube) characteristics. By the free fall means of the blank (falling distance should be as short as possible), dropping of the heating plastic on the cooling surface is prevented. As a result, it is possible to prevent the plastic blank from being excessively heated at any position on its top.

In a preferred embodiment of the invention, the blank can be made annular by means of a material feed head.

Furthermore, the blank can be separated from the material fluid by the material feed head and escape from the material feed head by the gas fluid. Since the material feed head has about the same temperature as the heated plastic, it hardly contacts the cooling surface before free fall. Separation of the blank from the material fluid by the material feed head can be achieved, for example, by pressing it. At this time, the gas starts to flow abruptly, so that only the last few short fibers of the material have to be separated, so the gas fluid can only act to eject the blank from the material feed head at a particular time.

In this step, the gas fluid is preferably directed obliquely in the direction of the dividing line dividing the material feed head and the blank. In yet another embodiment, the sealing member of the material supply head having the annular nozzle can be tightened while the material is flowing to form a predetermined contour shape of the annular blank.

Such fastening is preferably done so that the blank has a lenticular contour. As such, by the contour similar to the upright ellipsoid, the surface in which the blank is in contact with the cooled pressure zone is kept as small as possible.

EMBODIMENT OF THE INVENTION Hereinafter, the apparatus of this invention is described in detail according to an accompanying drawing.

1 shows a plan view of a rotor composed of a swivel 28. Indents 24 acting on dies 22 arranged at regular intervals in the circumferential direction are located on a swivel table 28, which indents 24 are formed with each die 22 and one jaw. To achieve. The die 22 is open upward, and the inlet 24 is positioned on the swivel 28 such that it can rotate in a vertical position (90 directions) coaxially with the corresponding die 22 in a horizontal position.

Since the pin 24 can be rotated in the vertical direction at the horizontal position on the coaxial line, the die 22 forming the jaws with the pin can be sealed and opened again.

In FIG. 1, for example, the swivel 28 is shown at an angle by one working position at a time in the direction of the arrow by a known supporting drive means (not shown), for example represented by the numbers 1 to 8 around the swivel 28. Thrust can be applied to move to eight working positions.

Hereinafter, the eight working positions will be described in detail.

First position: The dropping device 38 pushes the previously prepared tubular container (tubing) material 40, which is indicated in cross section, into the pressure inlet support shaft 42 provided with the pressure inlet 24. In this process, the support shaft 42 is in the horizontal position, so the input of the material is performed in the horizontal direction.

Second Position: The compressive material feed head 14, which is described in more detail by way of FIGS. 2 and 3, is placed in a second position. The plastic heated plastic is dropped from the material feed head 14 into the upwardly open die 22. The position of the die 22 can be seen at the seventh position. As the working position is gradually moved from the second position to the third position, the support shaft 42 is rotated to a vertical position coaxial with the die 22.

Third position: The support shaft 42 enters the die 22 together with the pressure inlet 24 coaxially with the die 22 by the elbow lever 44 which is in the third position, so that the die 22 In the tubular vessel head piece 48 at the second position. The filled plastic plastic is pressed, and at the same time the head piece 48 is melted and joined with the tubular container material 40 to be integrated. By known means, not shown, the support shaft 42 is fixed at this stamped position, and remains at that stamped position when the elbow lever 44 is ejected again.

4th position: Since the support shaft 42 remains in a crimping position, the pressurized container head piece 48 and the tubular side wall end body 40 are cooled, and these plastic plastic materials harden | cure. The die 22 and the support shaft 42 are cooled by a known refrigerant delivered through a connecting means not shown.

Fifth position: Since the support shaft 42 remains in the pressed position, the plastic material of the fired head piece 48 is cooled.

6th position: The support shaft 42 is moved to the axial direction again by the extraction | removing apparatus 46, and the pressurization mechanism comprised by the pressure inlet 24 of the die 22 is opened again. The portion of the die 22 containing the coil is shaped by means of an unillustrated means just below the swivel 28. When the working position gradually goes from the sixth position to the seventh position, the support shaft 42 is ejected into the horizontal position with the tubular packaging container material 40 and the molded head piece 48.

7th position: The container lid 52 is screwed onto the head piece 48 by the screwing device 50 in this position.

Eighth position: The tubular container consisting of the tubular container material 40, the container head piece 48 and the container lid 52 is finished and drawn out in the direction of the arrow 54, for example by known means not shown. It is removed from the support shaft 42. Then, the new tubular container material 40 is again injected into the support shaft 42 at the horizontal position (first position).

As mentioned above, although eight positions were described above, it is also possible to arrange the corresponding operation | movement operation among up to ten different numbers, for example.

The cooling process can extend to one or more working positions comprised of the pressurizing mechanisms 22 and 24 sealed by the support shaft 42, the press inlet 24, and the swivel 28. As shown in FIG. Such an arrangement is particularly advantageous because the time required for stepwise movement from one position to the next one position is not limited to the long time cooling process. For that reason, this arrangement method is more economical than when the indentation or die is permanently located at the location where such cooling process will be performed.

2, there is shown a fixed pivot 56 of rotation 28, which is rotated by means not shown and can be moved in stages. The die 22 provided with the upwardly open molding space 12 is fixedly coupled to the swivel 28. The forming space 12 corresponds to the distal end of the outer end of the tubular container head piece 48 (FIG. 1). On the coaxial below die 22 is another die 58, which is provided with a separate forming space 60 for forming a thread in the tubular container head piece 48. The pin 26 clamped in the axial direction by the spring 62 is fixed.

This pin 26 can move in the axial direction within the other die 58. As for the pin 26, the pin 26 clamped in the axial direction by the spring 62 is fixed. This pin 26 can move in the axial direction within the other die 58. The pin 26 is held in the direction of the forming space 12 of the die 22 by the spring 62, and when the push-in port 24 is intruded into the die 22 by the spring force of the spring 62 Pushed back. The pin 26 serves to isolate and retain the opening of the neck of the container when the tubular container head piece 48 is press-molded.

The die 58 is arranged to be rotatable about its axis to form a screw in the outer periphery of the head piece 48 when the stamping and molding of the tubular container head piece is completed.

The support shaft 42 provided with the inlet 24 is provided so that it can rotate around the pivot shaft 64. Spurek 66 acts to pivot its turn.

Since the spur legs 66 are connected to the plungers supported by the two bearing blocks 74 and 76 on the swivel 28, they can move in the axial direction. Between the bearing blocks 74 and 76, the plunger 72 is firmly connected to a follower 78 having a guide roller 80 guided to the guide groove 82.

The guide groove 82 is located in the annular guide flange 84 which does not rotate together with the support shaft 42 and is connected to the fixed rotation shaft 56.

The guide groove 82 extends in the guide flange 84 to have a rather small radius around the fixed pivot 56 when in the position corresponding to the third to sixth positions (FIG. 1). The large radius guide groove 82 shown in FIG. 2 corresponds to the seventh, eighth, first and second positions.

When transmitted to a small radius of the guide groove 82, the follower 78 moves accordingly, and the plunger 72 and the spur rack 66 are guided by the guide roller 80 in the direction of the fixed pivot shaft 56. Is moved to. The pivot portion 70 pivots the pivot portion 70 so that the pivot shaft is at the vertical distal position by the engagement action of the gear 6 with the spureck 66. It can be located on the coaxial line with. In this connected state, the material supply head 14 already described in FIG. 1 is in a vertical position (second position).

The elbow lever 44 in the third position (FIG. 1 is in contact with the roller 86 at this position, through which the connecting shaft 88, which moves axially in the pivot 70, is supported by the shaft support. Since it moves in the direction of the die 22 with the support shaft 42 and the press-in port 24 supported by 90 and this shaft support space, the shaping | molding space 12 provided in the die 22 can be sealed. .

As already described in connection with FIG. 1, the indentation 24 is supported by suitable mounting means, for example mounting means, not shown, in the above-described final position together with the supporting members 42, 90, 88. will be.

The material feed head 14 is permanently located in the horizontal position (first position) shown. The supply head 14 is formed with a material supply conduit 92 with a sealing member 20.

The sealing member 20 is configured as a valve cone and is mounted to be sealed and opened by axial movement by means not shown.

An annular nozzle 34 is enclosed around the supply end of the conduit 92, which is intended to produce a gas fluid which will be described later in detail with reference to FIG. 3.

The pivot shaft 64 is located in the bearing block 94 which is connected to the swivel table 28.

3 is an enlarged view illustrating main parts of FIG. 2.

The blank 10 shown in this figure is formed by the material feed head 14. This blank is slightly lenticular in outline. The shape is formed by adjusting the closure member 20 under constant material flow pressure in the material flow direction 16. By closing the sealing member 20 in the direction of the distal end 30 of the conduit 92, the blank 10 is separated from the material flow direction 16, in particular crimped or squeezed.

However, the gas fluid flows through the annular nozzle 34 at the dividing line between the material feed head 14 and the blank 10. As the gas fluid, a flow of air blown in a short time is preferable in order to discharge the blank 10 from the supply head 14 at a precisely measured time.

If this is achieved, the blank 10 falls into the forming space 12 surrounding the pin 26. This lenticular shape of the blank 10 is particularly advantageous because the surface of the blank 10 in contact with the die 22 is relatively small, thus avoiding cooling of the blank surface of a large area. For example, as a good example, the die 22 and the indentation 24 (FIG. 2) are used to cool the container head piece 48 (FIG. 1) as soon as possible after the pressurization of the blank 10 is finished. It is cooled by a refrigerant supplied by a device not shown.

As mentioned above, although the manufacturing method of the plastic tubular container (tub) was demonstrated as a suitable Example, it is possible to manufacture the plastic molded article of other uses by a similar method.

Using the upwardly open die 22 and the device with pins 26 erected therein, the blank 10 is dropped into the molding machine space 12 at a predetermined position, in particular the blank 10 at that position. You can never slip.

The drop distance between the material feed head 14 and the forming space 12 should be as short as possible.

The gas nozzle 34 can be omitted if a satisfactory separation of the blank 10 from the material feed head 14 is ensured.

The plunger 96 of the sealing member 20 is shown, by which the plunger 96 can be operated by means not shown.

Claims (1)

A plurality of molding dies 22 having upwardly open molding spaces 12 having an inner molding surface are provided at working positions around the swivel table 28 where each working position is designated and arranged at the same angle within the equiaxed ring, Supporting period in which a plurality of pressure inlets 24 which are operated in a horizontal position and a vertical position at the same time as the rotation of the rotating table while forming one jaw with the forming die are fixed to the connecting shaft 88 fixed to the pivot 70 ( A series of interlocking members 64,66,68,72,76,80 configured at one end of the support shaft 42 via 90 and for continuously operating each pressure inlet periodically between the horizontal position and the vertical position. 82, 84, and a conduit 92 for drop-feeding a blank of plastic material heated to the molding space from the vertical position in a timely manner in which the inlet is returned to the horizontal position in accordance with the rotation of the rotary table; With annular nozzle 34 and sealing member 20 Apparatus for forming a plastic packaging container, characterized in that it consists of aqueous extrusion of the configured extruded material feed tofu (14).

Images