DE1779280A1 - Two-cylinder compression molding - Google Patents

Description

DR. EULE DR. BERG D1PL.-ING. STAPF

PATENTANWÄLTE MÜNCHEN 2. HILBLESTRASSE 2O

• Dr. Owl dr Berg Dipl.-Ing. Stapf, 8 Monchen 2, Hilblestroße 20

Our sign

date

July 26, 1968

Attorney file Mr "

17th

Darid Stern Windsor. Btrkehir · / England

Irfindung b «al« ht sioh on # in · Plaetifieierrorriohtung and on «in Verfahrtn, sum plasticizing τοη Plastik · natsrlal.

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The invention provides an apparatus for generating 1η β Electricity ·· Sound plaetic plastic material «it at least two parallel to a common exit opening blind chambers, devices assigned to each chamber for plasticizing the material in the chamber and • in the establishment sum β ··· η dee plaetified material from each of the chambers into the outlet Bffmmg, where ·! "in· Facility sub locking each of the corresponding chambers against the entrance gate is seen.

In one form of the invention, the locking device is such that only one chamber is included at a given point in time the exit opening came in connection.

In another form of the invention, the locking device is such that both chambers are connected at the same time can stand with the outlet opening.

You invention comprises a device as described οίκκη in combination with a Spritsfuamaachin ·, In the dl · The exit opening of the device is totaled inside or outside several Spritsformen arranged in Sprltsgatsmaohlns is.

The invention further comprises a device wl wrote in combination with a Blaafor — snn1 as, im

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which is the exit opening of the device for filling one or more molds in the blow molding machine.

The invention further comprises a device as described above in combination with an extrusion mold, the can be operated as an extruder.

The invention also includes a method of producing a Flow of plasticized plastic material at which the material is plasticized in at least two separate chambers, the chambers are connected to a common outlet opening, and the placed material is pressed from one of the chambers to the outlet opening, while another or the second chamber with Material is refilled and the material is plasticized in the chamber.

Preferably, the plastic material is pressed into a mold after it leaves the exit opening and the mold is only filled with material from one chamber.

In this form, a second mold can be made from a second Chamber rolling to be filled, while the mentioned one chamber is filled with new material and this

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is plasticized.

In another form of the invention, the plastic material is pressed into a mold after it has opened the outlet has left, and the content (or part of the content «) is used in more than one chamber to fill the form will.

In the last-mentioned form, a first one is preferred Chamber connected to fill a ^ part of the form iu It is then separated from the form and a «wide karamer» is connected to another rope of the fora fill su

Optionally, a first chamber is connected to fill part of the mold and a "wide chamber" is added the mold attached »to fill another part of the BU mold before the first chamber is separated from the mold will.

The first chamber can be used more than once to fill the form "u"

The chambers can be connected to the exit opening one after the other in a different execution format. i.e. without interrupting the flow of material.

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Some preferred embodiments of the invention will now be explained as examples with reference to the drawings.

Pig. 1 is a schematic side view of a typical one Spritagußmasohine.

Fig. 2 is a plan view of an injection molding machine naoh

»Ι«, ι.

Fig. 5 is a perspective view showing a feature of the invention in which a rope is broken away.

Pig. 4 is a schematic view of a valve shown in FIG t in the first embodiment of the invention is used in three operating positions

FIG. 5 is a schematic view of a valve shown in FIG a second embodiment of the invention is used, also in three operating positions

Fig. 6 is «Ine eohenatleohe view of a rotary valve for intermittent or continuous operation ·

FIG. 7 is a representation of the valve shown in FIG Arrangement after pressing a micro-holder.

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fig. 8 is a schematic representation of a valve for intermittent or continuous operation} and

Pig. 9 is an illustration of a valve downstream. 8 in Arrangement to press a laikroach switch.

figs. 1, 2, 3 and 4 represent a first embodiment of the Invention when applied to an injection molding machine.

As in 71g. 1, a typical injection molding machine has a base head 11, a movable mold plate 12, a fixed mold plate 13 and an injection mold 14 » which is formed from swei ropes, with one part each being attached to one of the mold plates, eo that the mold parts are closed when the 'mold plate 12 against the mold plate 13 is moved. The machine has a fuel unit 15 and rotary and thrust motors 16, which Drive injection unit 15

Invention geeäfl has a fuel unit as described in 'lg is shown, an exit opening or DUse 17, dl « ▼ on two plasticizing devices arranged in parallel A and B («is fed Heating strips 19, which are fixed housing 20 tweohlielen. Within each housing 20 there is a sons piston 21

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arranged, which eich rotates within the housing «and also moved axially in relation to the housing when it is through the motors 16 is driven

Both plasticizing devices are fed from a spout funnel 22 which is arranged above the plasticizing devices at their end remote from the nozzle. Each plasticizing device guides the material of the nozzle via a rotary valve 18 which is actuated by a rotating actuating device 23. The rotary valve is shown schematically in FIG. The passages 32 and 33 lead to chambers at the opposite ends of the plasticizers A and B and the third passage 34 leads directly to the nozzle. Inside the housing there is a rotatable feed element 35 which has a knee channel 36. The knee canal 36 extends between two points on the surface of the feed duct 35 which are offset by 90 ° in a plane perpendicular to the housing axis. The channel 36 can connect the passage 34 to each of the passages 52 and 33, or it can be brewed in a split in which

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none of the passages 32 and 33 are connected to the channel 36 is. There are three positions of the feed element at I, II and III in fig. 4 shown.

In operation, the snow piston element 21 in the pelletizing device B is initially in a "forward ^M position and is set in rotation. The material falls from the hopper 22 onto the rear part of the son corner. The screw and the cylinder walls are dimensioned so that the material is transported from the rear end along the screw into the chamber located immediately in front of the front end of the son's corner The screw is pushed backwards by the increasing amount of material fed into the chamber in front of the son's corner takes place at the front, is determined by the power and length of the hot belts, the design of the screw, the power and speed available for turning the without corner and by the nature of the raw material, which during its transport from the rear to the front Pour the end of the corner from a mold customary for the raw material into a sum of fuel igneten state is converted.

When the screw has reached a rearward position, it is driven near the front and presses the material duroh

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the passage 33, the knee channel 36 and the nozzle 17 in the closed mold parts 14, the entire free space in the mold is filled with the plasticized material.

The screw exerts still v / pus a forward pressure on dae material from "to the to be formed ^fl 'is eil solidifies in a web part of the Forii. The rotary valve 18 is switched to position II and thus blocks the mold from taking out the injection molding,

The son corner piston 21 begins its movement again as described above.

During the plasticizing device B build the filling funnel is charged, the plasticizing device A is via the rotary valve 18, the passage 32 and the knee channel 36 connected to the nozzle 17 · The two plastifle devices turn and move away from the nozzle in order to plasticize the material from the hopper, and move forward to press the material into the mold. While the plastic material consists of a Plasticizer is injected into the mold, hardens and when the mold is removed, the other becomes Placing device operated to aue the raw material the funnel into a form suitable for sun injection

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to convert *

Depending on the choice of materials, the thickness and shape dee Injection molding and the molding weight in relation "To the performance of the machine, the fuel can off The mold must be removed before the son corner has enough material for the manufacture of another compact from the Filling funnel plasticized and transported into the anterior chamber Has. Under these circumstances, flow arrows form one further compacts are delayed "until a sufficient amount of the raw material is processed by another tendon 21 has been.

The production output of the machine is then based on the speed given, with which a given plasticizing unit can process the material during the time, in which the son's corner is not used for its other functions.

A typical sequence of two successive work cycles when using the device will now be given as an example described!

A 196 g heavy polypropylene compact is produced on units that have a plaetification performance for this »

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Have material of 14 g per second and at which the The injection phase lasts 3 seconds, the result of which is the removal of the compact from the machine as follows

Injection (A) 3 seconds) Plasticizing during

) 14 seconds

Hold 10 seconds) ^{binary B}

Plasticizing for 14 seconds Unit A

Emptying 3 seconds

Injection (B) 3 seconds hold 10 seconds

Emptying 3 seconds

32 seconds for 2 pellets.

It should be noted that the embodiment described above can be used both on a blow molding machine and on an injection molding machine.

In a second embodiment of the invention, as shown in Figs. 3 and 5, the plasticizing devices are connected to an outlet or a mouthpiece which is designed as an extrusion mold. In In this embodiment, shift valves 18A are used « How schematize !! in Pig. 5, channels 40 and 41 lead from the plasticizers A and B, respectively, and channels 42 and 43 to the extrusion die. The valves have sliding Parts 44 and 45, which can be arranged so that

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the channels 40 and 42 or 41 and 43 either connect or shut off.

In this embodiment, the screws 21 alternately press plasticized material through the extrusion nozzle in a continuous extrusion process.

Continuous exit from the mouthpiece is achieved by using slide valves 18a in conjunction with the Screws 21 achieved, which work as follows

At the beginning the screws 21 are in the plasticizing directions A and B in the front position Plasticizing device A is rotated and transported thus material su the space in front of the son's corner, where dl Snail with a corresponding speed jsurüokbe ~ is moved away.

When the valves are in position I, dl · Sohneoke A is pressed forward and initiates the extrusion through the mouthpiece. During this time the screw 21 is in. Unit B rotates and transports the material in the space in front of the snail, where sioh the Sohneck · with BurUck moves at a corresponding speed. Dl Sohneoke B reaches its rearmost position in front of or ßleioh »·! - at the moment when the snail A has a lag

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briefly reached the goal of their foremost position. The valves 18a are brought into position II and begins at the same time the screw B its forward movement. At this moment both units A and B cause the material to escape through the mouthpiece.

The screw A begins to rotate and at the same time the valve 18a is brought into position III. The son's corner A transports the material into the space in front of the screw and moves back at a corresponding speed while screw B continues the extrusion The screw A reaches its rearmost position before or at the same time as the moment in which the ScMieoke B reaches a position reached shortly before their foremost position. The valves 18a are brought into position II and begin at the same time the screw A is moving forward. At this moment both units A and B cause the material to escape from the mouthpiece.

The one placed on the corners of the son 21 during their Vorv / ärtehubes Force can be controlled in such a way that the pressure and speed applied to the raw material which the material is pressed through the mouthpiece, remains constant during the animal phases described above.

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In this arrangement for continuous extrusion, the rotation of the screw in the first line of the plastl fication, while the separate piston-like movement provides that required to force the material through the mouthpiece Pressure guaranteed.

The tendon piston 21 can by the action of a hydraulic pump be driven forward, the hydraulic fluid with a constant flow rate either one the piston feeds or both at the same time. When both pistons are operated at the same time, the single speed is the forward movement half the speed that is achieved with only one piston forward is moved. Thus, a constant flow rate is through maintain the extrusion die.

Another embodiment of a rotary valve is shown in FIG shown. In this case, the passages are from the validators A and B offset by 90 ° against each other and un 120 ° against the passage leading to the mouthpiece. In position I, the plasticizing device B supplies the Mouthpiece, in position II the mouthpiece is locked and in position III supplies the plasticizing device A the mouthpiece.

Ee «ti notes that if the rope 35A tos 180 ° bends

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is rotated to its position II, both passages 50 and are in communication with the passages 23a and 33a, so that the Liundstiick from both plasticizing devices is supplied at the same time. This allows the Drelrventil 6 can be used in an extrusion arrangement.

Fig. 7 shows the valve of FIG. 6 (in position I) at Operating a Iuikroechalters 52 between the position I and position III by a further sub-process of the machine cycle initiate.

Fig. 8 shows schematically the mode of operation of a set of linear valves which can be used both for injection molding (or blow molding) as well as for extrusion. In Fig. 8 two linear valves are shown. Movable parts 54 and 55 are slidingly arranged in guides 56 and 57, respectively. and each movable part has a passage 58 and 59.

In position I, passage 58 permits injection into a molding machine from unit A while the unit is in operation B is blocked. In position II, both units are blocked and in position III the passage 57 is permitted Injection into the compression molding machine from unit B.

In another arrangement (position IV), the material from both units can be fed into the compression molding machine at the same time.

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be injected.

9 shows an axial section through one of the linear valves 8, this shows. Actuation of a microswitch 60 through the valve to initiate a further sub-process initiate the machine cycle

When the device for intermittent feeding of Plastic material (i.e. around injection molding or blow molding) is used, either a rotary valve can be used for two connected injection units, as in Fig. 4, or there can be a slide valve for each individual cylinder can be used as in Fig. 5 «In the latter case · both channels would be blocked in position II in FIG.

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Claims (14)

Claims ί 1.) Device for generating a stream of plasticizing plastic materials with at least two chambers, devices assigned to each of the chambers for plasticizing the material in the chamber and a device for pressing the plasticized ""! Material from each of the chambers to an outlet opening, characterized in that the Λ chambers are connected in parallel to a common outlet and in that a device is provided for shutting off each of the chambers from the outlet. 2. Device according to claim l _f, characterized in that the shut-off device 1st such that only one chamber at any time in connection with the; Exit can stand. 3. Device according to Anepruch 1, characterized in that the Abeperrvorrichtung is such that both chambers can be connected to the outlet at any time. 4. Device according to one of the preceding claims in combination with an injection molding machine , characterized in that the exit of the device for filling one or more molds is arranged in the injection molding machine . - 18 109836/0477 .... _L. - 10 - 5. Device according to one of claims 1 to 3 »in combination with a blow molding machine, characterized in that the outlet of the device for filling a or several Jormen are arranged in the blow molding machine. 6. Device according to one of claims 1 to 3 »in combination with an extruded mold, characterized in that the device is arranged for operation as an extruder 7 · Plasticize process for creating a flow Plastic material, which is the plasticization of the material comprises at least two separate chambers, characterized in that the chambers have a common exit be connected and that the plasticized material is pressed from one of the chambers to the outlet is, while a further or the second chamber is being refilled with material and the material in the chamber is plasticized will. 8. The method according to claim 7 # characterized in that the plastic material is pressed into a die after it has rerlaeeen the exit, and that the Preßfora bit Material only is completely filled from one chamber. 9 · The method according to claim 8, characterized in that - 19 -109836/0477 bad O ^ ν al 17/9280 a second mold with material from a second chamber is completely filled, while further material is refilled and plasticized in one chamber. 10. The method; according to claim 7 »characterized in that there« Plastic material is pressed into a die after it has left the outlet and that the contents (or part the contents) is used by more than one chamber to pull the mold. 11. The method according to claim 10, characterized in that a first Kanamer is connected to fill a part of the mold and is then separated from the mold, and that then a ZT »side Kai? Un is connected to a further part to fill the form. 12. The method according to claim 10, characterized in that a first chamber is connected to a part of the To fill the mold and that a second chamber is connected to the mold to another part of the mold to fill before the first chamber is separated from the mold. 13 · The method of claim 11 or 12, characterized in that the first chamber is used more than once, to fill the mold «u. - 20 109836/0477 14. The method of claim 7 »characterized according to which the compartments are successively connected to the outlet, ie without interruption of the current · 109836/0477 • BAD OSi Empty side