DE2611040A1 - DEVICE FOR CONTINUOUS STRETCH BLOW MOLDING - Google Patents

Description

DR. BERG DiPL.-ING STAPF
DIPL.-ING. SCHWABE DR. DR. SANDMAIR ~ β <\ 1 Γ] Λ Q

PATENT LAWYERS

8 MUNICH 86, POST BOX 86 02 45

Attorney file 26 917 . , ".,.

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Monsanto Company, St. Louis, Missouri / USA

Device for continuous stretch blow molding

The invention relates to a method and an apparatus for the continuous molding of molecularly oriented objects in a rotary table stretch blow molding machine.

Although blow molding technology began 100 years ago, blow molding of hollow plastic objects, like containers, has only achieved significant economic success in about the last 20 years. With the

609840/0787

«(089) 98 82 72 8 Munich 80, Mauerkiitherstraße 45 Banks: Bayerische Vereinsbank Munich 453100

987043 Telegrams: BERGSTAPFPATENT Munich Hypo-Bank Munich 3892623

983310 TELEX: 0524560 BERG d Postscheck Munich 65343-808

Increased interest in blow molding technology gave rise to a strong effort to improve strength and other properties of finished containers made in this way. Known Ways To Improve Strength of plastic containers involve changing the chemical structure of the plastic material during synthesis through strength modifiers or increasing the wall thickness of the finished article. The former way can cause undesirable other properties the material can be influenced, whereas the latter way can be very expensive.

Another attractive way to improve strength properties of a finished container is that blow molded into the shape of the container to give thermoplastic material a molecular orientation. In general, a molecular orientation becomes an appropriate one thermoplastic material achieved in that the material is in the solid state at a temperature straight is stretched below its crystallization melting point. Albeit the orientation to an essential one Can lead to an increase in tensile strength, it cannot be achieved in a conventional blow molding process.

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One method of obtaining the desired oriented product is disclosed and included in U.S. Patent 3,507,005 extruding a hollow parison, cooling it to room temperature, carefully reheating it until just below its crystallization melting point, grasping the preform at one end, while it is pinched or compressed at the other end, as well as its longitudinal stretching. Then the Preform, while it is still held at the first end, enclosed in a mold and inflated so that it takes the shape of the mold cavity. However, such a procedure is somewhat complex and cannot be easily accomplished of high speed manufacturing which is necessary for a successful and economical process. Another method of making oriented Container involves the initial manufacture of an elongated thermoplastic workpiece such as one preform closed at one end. The preform is then brought to the required temperature and in brought a closed mold over a rod which is extended to stretch the preform, which is then is inflated using compressed air to achieve an object that has the desired biaxial orientation

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tation has. Even if such a procedure is one
attractive way of making oriented containers
it must be carried out in an apparatus that allows high speed manufacturing if it
should be economical.

Although a large number of blow molding devices are known which are designed for high speed continuous manufacture are suitable, most of these devices are based on the conventional blow molding process directed without stretching orientation and do not relate to a process in which a rod is in the process of being manufactured of the container is pushed out into the mold and withdrawn from it.

The invention relates to an apparatus and a method by means of which molecularly oriented objects can be formed continuously. The device contains a rotary table stretch blow molding machine with several stations that
especially for fast feeding and discharging from the
Machine is suitable.

More particularly, the invention provides an apparatus for continuous Forms of molecularly oriented objects,

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with a plurality of radially divisible blow molds which are arranged at angular intervals around a support on a frame and can revolve continuously about a substantially vertical axis. Also are a mold moving device for moving the mold sections of the blow molds between closed positions and open positions synchronous with the rotation of the carrier, for each shape a stretching rod arrangement, which in cooperation with the Form moving device can be actuated and an adjusting device for the stretching rod for moving it back and forth comprises in its longitudinal direction, while in a mold cavity of the mold, one of the stretching rod assemblies associated pressure medium blowing device and a vertical slide for the container in the vicinity of the cavity any shape provided.

In another embodiment of the invention is a Stretch blow molding machine with a stretch rod that extends both inside the mold cavity and into and out of the Cavity is movable back and forth, with a feed and output device for simultaneously feeding a workpiece and dispensing a molecularly oriented inflated article.

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From a procedural standpoint, it is in accordance with the invention in the method of blow molding articles from preforms, in which such preforms are in cavities continuously moving and successively available molds are introduced, the preform line expanded within the moving forms to form the objects and the objects out of themselves molds that are still moving are output at an ejection station before they are loaded with further preforms, Provided that a preform is briefly held or stored on any such moving mold, while an article is molded from a previous preform in the cavity of that mold.

Preferred embodiments of the invention can be seen from the drawing. The following is based on the drawing the overall invention explained. In the drawing shows:

Fig. 1 is a schematic side view of a molding station of the turntable blow molding machine including the novel device parts according to the invention,

2 is a schematic plan view showing the one molding station of the rotary table blow molding machine.

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Fig. 3 is a schematic front view of the one forming station the turntable blow molding machine and

4 to 11 are partial sections in side view, the operational sequence can be seen at a forming station at different times during its rotation around the rotary support is.

Referring to Fig. 1, there is shown a rotary table blow molding machine, indicated as a whole by 10, for continuous molding Molecularly oriented objects such as containers and especially bottles can be seen. It's just a forming station shown, however, a plurality of like forming stations are equally spaced around the circumference the supporting structure.

The blow molding machine 10 has a vertical shaft 12, which has a hub 15 for continuous rotation therewith Via conventional drive devices such as a motor, a gear reduction or the like (not shown). Fixed An annular mold support plate 16 is attached to the hub 14 .

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A plurality of the same mold units, each designated in its entirety by 18 and of which the One is shown and will be described in detail later, are at regular intervals around the support plate 16 arranged. Each of the mold units 18 includes divisible mold sections 20a and 20b, which in the closed position form a cavity 22, the surface of which has the shape the body of a hollow object, such as a bottle, made of a thermoplastic material to be molded therein (Fig. 8). The mold sections 20a and 20b can) in the usual way (for example by means of bolts or clamps) in form-pressure plates or carriers 24a and 24b, which in turn, the remaining parts are operatively associated with the machine in a manner which will be more clearly described.

Each mold pressure plate 24 a and 24 b of the divisible mold unit 18 is slidably supported on guide rods 26, 28, 30 and 32, which also maintain alignment of the platen and attached molds (see Fig. 3). the four guide rods are firmly attached to the support structure, which is attached to the support plate 16.

The outer mold portion 20b and the associated mold pressure plate 24b are back and forth between an open and

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Closed position is moved by the movement of coupling rods 34 and 36 (Fig. 2) which are attached to the mold pressure plates are secured in any suitable manner, for example by the bolts shown in FIG. An actuator for synchronizing the mold movement with the rotation of the backing plate 16 using a cross slot slide assembly or the like as described below is contemplated.

As can be seen from Fig. 1, a curve guide 38 is for opening and closing the mold firmly attached to the base of the machine. A follower roller is on a lever 42 40 or the like. attached, which moves within the cam slot 44 in the cam guide 38. The lever 42 is connected to the shaft 45 via the latching (torque limiting device) and gear arrangement 46. the Shaft 45 is connected to a cam or an eccentric 48, which in turn is connected to a pair of crank arms or lever arms 50a and 50b is connected. The lever arms are connected to one another via connecting pins 52 and bearings 53. Of the Lever arm 50b is attached to another cam 54. The bearing 53 is free to rotate around the connecting pin and

58 fits into a slot 56 on the plate the transverse slot

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leadership (Fig. 2). The coupling rods 34 and 36, which on the outer mold portion 20b and the mold pressure plate 24b are fixed to the plate 58 of the cross slot guide attached and move laterally with the rotation of the shaft 45 under the action the parts described above back and forth.

The inner mold portion 20a and the mold pressure plate 24a also move with the rotation of the shaft 45, but in to a lesser degree than the outer shape. This is due to the interaction of the cams 48 and 54 and their associated Rolls 60 and 62 accomplished. The rollers are attached to the pressure plate 24a, which in turn is supported on the guide rods 26,28,30 and 32 and on it slides back and forth. The inner mold portion 20a is moved under the force of springs 26c and 28c, the are arranged on the guide rods 26 and 28 (Fig. 1), and under the force of springs on the guide rods 30 and 32 (not shown) which abut the mold pressure plate 24a and rollers 60 and 62 when the cams or Curve pieces 48 and 54 move to the left when the Form opens.

Synchronous to the movement of the mold sections, the stretching

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rod 64 is moved into the desired operating positions as follows:

The stretching rod 64 is between its fully extended position (FIGS. 4 and 7) and its position immediately ahead Beginning of the stretching process (Fig. 5 and 6) by the movement of lifting devices such as the air cylinder 66 under the Effect of the air cylinder guide 68 and the air cylinder follower roller 70 moves. The extension rod 64 is attached to the piston rod (not shown) in the air cylinder 46 and moves accordingly with the air cylinder and piston rod. The air cylinder 66 is with the follower role 70 connected via the arm 74. The arm 74 and air cylinder 66 slide in guides or tracks (not shown) in FIG the support structure or the frame, which is designated as a whole by 77, and on the circumferential support plate 16 is appropriate. When the support plate 16 rotates, moves the air cylinder 66 by the interaction of its paths with the follower roller 70, which is in the slot the cam guide 68 is moved, which is fixedly attached to the fixed frame or base body of the machine. the Curve guide 68, which is shown as a box guide, runs around the entire turntable machine and depending on the shape or in the direction of the cam slot 52, the follower roller 70 and the connected air cylinder 66 move as well the assigned structural components as desired to the top 609840/0787

and below as the support plate 16 rotates. Under this effect is the stretching rod 64 from the initial position for the stretching process (Fig. 6) in its fully extended Position (Fig. 7) raised.

In the illustrated embodiment, the retraction the stretching rod 64 from the mold cavity 23, i.e. from the initial stretching position or position after blowing (Fig. 6 and 8) into their completely withdrawn position from the mold cavity (Fo. 9 and 10) by the action the top of the piston (not shown) in the air cylinder 66 with air. This causes the piston rod, which is fixed to the piston, and pushed down the attached extension rod 64, wherein the extension rod is lowered into the sealing plug 76 as shown in Figs. The application of air pressure takes place via the valve 79 and the actuation of this valve is accomplished via valve actuation devices. The actuation of this valve is achieved by the closing. cooperate the curve guide 81, which on the frame of the Machine is set, and the follower roller 83, which is connected to the valve via the rod or shaft 85 is. The valve 79 is attached to the support structure 77 in a conventional manner (not shown) and rotates with it of the structure when the support plate 16 to which it is attached

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is brought around. The follower roller 38 runs along the curve guide 81 completely around the machine and through their movement changes the direction of the valve 79, which causes the piston in the air cylinder to either or the other side is pressurized with air, whereby the stretching rod 64 is raised or lowered. Air admission also occurs when the stretching rod is inside the mold cavity through the interaction of the cam guide 38 and the follower roller 70 is to be moved. This air is over the bottom surface of the piston in air cylinder 66 the air valve 79 and holds the stretching rod 64 in the extended position during this part of the Cycle. The actual air supply connections from valve 79 to air cylinder 66 are not shown, so as not to to make the drawing confusing and not to detract from the essential features of the invention.

In the embodiment shown in Figs neck pawls 78a and 78b open and close around the neck of the workpiece and the inflated object by the movement of air cylinders 88 and 90 which are on

the mold sections 90a and 20b and the mold pressure plates 24a and 24b are attached. The respective claws can also for reasons to be described by the movement of the associated piston and the piston rod of the Air cylinders 88 and 90 are moved. The drive for such

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Movements can be made by a common device (not shown), such as a curve guide or a cam, which are fixed to the frame of the machine and limit switches for opening and closing the air supply valve trigger.

The sealing plug 76 is moved upward to seal the neck of the workpiece and the stretching rod when the mold is closed. This is achieved by means of the guide 80 for the sealing plug and the follower roller 82 for the sealing plug (Fig. 1). The cam guide 80 is attached to the stationary frame of the machine and the follower roller 82 runs up and down on the cam guide along as the support plate 16 rotates, thereby moving the sealing plug that is overlaid with the roller the lever 84 and the eccentric 86 is connected. The spring 87 (Fig. 1) holds the plug 76 when it is in the sealing Is engaged so that the cam guide 80 does not need to completely revolve the machine and only in positions can be provided where the sealing plug 76 is to be lowered. In other words, it can be allowed that the follower roller 82 runs freely until it engages the cam guide 80 again.

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As shown in Figures 4-11, there are feed and discharge devices provided to quickly feed workpieces 92 and inflate articles 98 from each Dispense stretch blow mold. A plate 94 is attached to the outer mold portion 20b and the pressure plate 24b and moves laterally along with the movement of these parts by the rotational movement of the support plate 16 and the facilities described above. The workpiece or preform 92 is made by means of a conventional Pick-up and deposit device or another device lowered or dropped into a guide, i.e. a chute or filler socket 96, preferably located near the cavity at each molding station is. The vertical shaft or workpiece holder 96 is supported in a customary manner, not shown, preferably by means of the support plate 16 or by other structures or devices, and it provides, together with the plate 94, means for guiding and holding the Workpiece 92 until the mold has opened and the stretching rod 64 in its position for receiving the workpiece and is arranged to initiate the sequence of operations for molding an object. At the same time becomes an inflated Item, such as a bottle 98, out of the mold through a common dispensing chute as shown

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associated opening 100 in the support plate 16 output. Alternatively, such a dispensing opening and such Well, which are carried by the support plate 16, above the axis at the cavity 22 in adaptation to a after system outputting above must be attached. The bottle 98 is held in the outer mold section 20b via a holding device, which comprises the overlapping portion at the top of the outer mold 20b, and is held by claw means, i.e. the right neck claw 78b, which is of such a shape or configuration as to constitute an essential part or portion of the neck of bottle 98 (Fig. 10). This way the bottle will move with the right shape 20b and the neck claw 78b. When the bottle is substantially above the opening 100, (Fig. 11), will the neck claw 78b pushed sideways to the left under the drive of an ejector or release device, which an air cylinder 90 and its piston rod, whereby the bottle from the mold section or the mold half 20b is solved.

In systems alternative to the systems described, for example in a system where the items are discharged upwards from the open form, are the cylinder 66 and the associated air control circuit are not absolutely necessary, since it is not necessary to remove the rod 64

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fully pull out of the mold cavity in such systems. However, it is even with the one just described Arrangement possible, the rod from the mold cavity via the mechanical curve guidance system via suitable curve guides, that is described above to withdraw.

To explain the device more clearly and in particular to describe the synchronizing effect of the corresponding Parts, the mode of operation will be described with particular reference to Figs. 4-11, which illustrate the sequence of events show which occur in a selected form at different times during the rotation of the support plate 16.

The process begins, as shown in FIG. 4, when a new workpiece 92, such as a previously formed thermoplastic Preform that has been re-heated to the orientation temperature and a tubular body with an open End and one closed end, lowered onto a fully extended stretching rod 64 and a molded bottle 98 is completely separated from the mold portion 20b and begins to fall down through the discharge opening 100. Of the Preform 92 can freely fall onto the rod, which is

extends upward on the axis of the mold cavity, since the plate 94 together with the mold section 20b and the pressure

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plate 24b has moved, causing the lower end of the channel 96 is released above the now open form.

In the next step, which is shown in FIG. 5, the bottle 98 now falls from the mold cavity into the opening 100 and the optionally available shaft or channel 102. During this time, the stretching rod 64, which is the newly supplied Preform 92 holds, withdrawn (lowered) into its normal starting position (start of stretching). this will accomplished by the rotation of the support plate 16, which causes cam roller 70 to move within slot 72 into the lower position in cam guide 68 will. The air cylinder 66 connected to the roller via the arm 74 thereby moves in tracks in the frame or the support structure, thereby lowering the stretching rod 64 and preform 92 to their positions where the stretching begins. The application of air to the lower side of the piston in the air cylinder 66 causes the stretching rod 64 is held stable during the movement and is also retained in the position in which it was lowered by the action of the cam guide 68 and the follower roller 70 (Fig. 1).

As the support plate 16 continues to rotate, the start Mold sections 20a and 20b and their associated pressure plates

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24a and 24b as shown in FIG. this occurs through the interaction of the rollers 40 for opening and closing the mold with the cam slot 44 the opening and closing curve 38 for the mold (Fig. 1). The roller 40 moves with the rotation of the support plate 16, causing the rotation of the shaft 45 under the action of the connecting lever 42, causing it to rotate the cross-slot guide arrangement and in particular leads to the pivoting of the lever arms 50a and 50b. Through this the coupling rods 34 and 36, which are connected to it are moved sideways in a reciprocating motion, thereby closing the outer pressure plates 24b and its mold portion 20b is initiated. At the same time, the inner mold portion 20a also moves to a closed position by moving the cam guides 48 and 54 to the right, causing the rollers to move 60 and 62 leads in this direction together with the pressure plate 24a which is attached to it (Fig. 1). It will care pointed out that the rotation of the transverse slot assembly and in particular the pivoting of the lever or crank arms 50a and 50b advantageously takes place by slightly more than 180 °, in order to press the closed mold sections against one another and thereby close them using additional tensile or clamping forces lock. The curve guide 38 does not need to run completely around the entire machine, rather it can be in Sections where opening and closing of the mold is desired.

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As the mold sections 24a and 24b close, the neck claws 78a and 78b also close around the neck of the preform 92 by the movement of the air cylinders 88 and 90 attached to the mold sections and the mold pressure plates 24a and 24b are attached. At the same time, the sealing plug 6 begins, under the action of the sealing cam 80, the seal follower roller 82 and the lever 84, as also shown in FIG. 6, to move upwards.

When the mold sections 20a and 20b reach their fully closed position, as shown in Fig. 7, the sealing plug 76 moves upwardly so that it seals the neck of the preform 92 and the stretching rod 64 .

After the mold has closed and the mold cavity 22 is fully sealed, the preform becomes inflated into the shape of the object. Preferably, the stretching rod 64 begins with the movement of the Follower roller 70 in cam guide 68 to move upward as rotation of support plate 16 (FIG. 1) continues. With this operation, the tightly held preform 92 is stretched in the longitudinal direction when the stretching rod 64 approaches and reaches its fully extended position according to FIG. When the stretching rod 64

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is fully extended through openings not shown in the stretching stage 64 air under pressure via an air supply device 65, which causes the stretching in the radial direction, so that the preform 92 is fully stretched and is biaxially oriented. Blown air can alternately through the sealing plug in a not shown Way to be fed.

Due to the closure of the mold, the plate 94 is returned to its position under the well 96 and a new preform 92a is lowered into and up into the shaft by externally attached devices (not shown) stopped on its way through this plate 94 or prevented from further falling. The preform 92a is standing now ready for feeding into the blow mold located below (Fig. 7). By holding prematurely or Store a preform 92 which is inserted into the holder from an upstream station was, in the holder 96 at each moving forming station, while an article in that form from a previous one Preform is molded in the manner shown, the period of time during which the mold is closed is increased can be kept and on the previously fed

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Can act preform. In other words the molding stations are kept open longer during each cycle when the preform is immediately in the Form would be introduced from an upstream station, instead of just placing it on the stretching rod 64 from a position that is already at the continuously moving forming station is located. Keeping the forms open for a longer period of time would mean that for a system which has the capacity to accommodate is comparable to the system explained, additional forming stations would have to be added, so that the complexity of the system would be enlarged. Therefore, the effectiveness of the system is significantly increased by the fact that individual Preforms 92 are introduced into holders 96 at a delivery station, which are adjacent to these shapes and are in contact with them move them while articles in these molds are formed from previous preforms. The forms are then loaded directly from these holders, preferably while the preforms are at molecular orientation temperature are located during or after the articles formed from the preceding preforms from the Form are dispensed at the dispensing station and while the forms travel a closed circular path.

After completing the stretching and blowing process

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begins the stretch rod 64, under the action of the follower roller 70 in the curve guide 68 with continued Rotational movement of the support plate 16 to retract. The stretching rod 64 then reaches its middle position within the Mold cavity 22 as shown in FIG.

The extension rod 65 continues to retract until it has emerged from the mold cavity as shown in FIG. This happens when continued through Rotational movement of the support plate 16 causes the follower roller 83 to move along the cam guide 81 and thereby actuating valve 79, allowing the upper side of the piston received in air cylinder 66 to be is pressurized with air, so that thereby the connected stretching rod 64 is pushed into a lower position. The mechanical and pneumatic retraction operations described above can be performed simultaneously will. At the same time, the sealing plug begins to withdraw from its sitting position in order to vent the to achieve inflated bottle 98 by blowing air. This is done by moving the roller 82 along the cam guide 80 accomplished in cooperation with the lever 84.

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The stretching rod 64 and sealing plug 76 are now fully withdrawn and the mold sections 20a and 20b begin with the continued rotation of the support plate 16 under the action of the roller 40 and the guide 38 to open by reversing the closing process described above (Fig. 10). The molded bottle 98 is made from the outer mold half 20b and there due to the shape or shape of the overlapping part at the top Part of the shaped section (bottom part of the bottle) and additionally through the design of the neck claw that encompasses it 78d held. To assist in the movement of the molded bottle 98 along with the outer mold half 20b when the mold begins to open, the neck claw 78a will be sideways to the right against the neck of the bottle below the action of the air cylinder 88 and its piston rod moves. This additional force contributes to that the outer mold portion 20b holds the molded bottle when the molded seal is initially loosened and the corresponding Mold halves are separated.

As shown in FIG. 11, the outer mold section has now become 20b moved into the position essentially above the dispensing opening 100 in the support plate 16. At this point in time the bottle 98 is moved from its retained position in the outer mold section by the lateral movement of the Neck claw 78b to the left under the action of the air cylinder

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90, which causes the neck of bottle 98 and its bottom (which faces upwardly) to be removed from the mold section comes free. At the same time, the stretching rod 64 begins to move into the space between the mold sections 20a and 20b under the action of the lower side of the piston of the cylinder 66 with air or alternatively through the interaction between the follower roller 70 and the cam guide 68 in reverse of the retraction process described above. Mutual devices, such as air-blowing devices, may be provided in the outer mold 20b to aid in ejection of the bottle.

If the stretching rod 64 continues to extend fully between the open mold sections 20a and 20b, as shown in Fig. 4, the sequence of operations is completed. This process is carried out by the movement of the follower roller 70 in the cam guide 68 during the continued rotational movement of the support plate 16, reversing the above for the retraction the stretching rod 64 causes the process described. The stretching rod 64 is now in its position in which it can receive a new preform 92 and from which it repeats the operating sequence described above can be.

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The embodiments described above show a preferred one Rotary table stretch blow molding machine in which the actuation of the blow molds is synchronized with the movement of the corresponding stretching rod, so an improvement for the production of molecularly oriented objects in faster achieved continuously and thus saved time and space due to the compactness of the arranged equipment will.

Changes to the equipment can - as will be apparent to a person skilled in the art - be included. For example, the opening and Closing movements of the mold sections are carried out in a more conventional manner, in which mold sections to a be moved to the same extent. However, the advantage of the preferred embodiment of the invention is that it takes up space decrease, especially large when commercial operations are involved. It is further noted that Both adjusting devices for the stretching rod can be operated mechanically such as by cam controls. However For commercial reasons, it seems more practical to use the preferred combination of a mechanical with to use a pneumatic device. Although the actuators shown are preferred, other common electrical, mechanical, hydraulic, pneumatic and measuring and regulating devices can be used including, for example, electrical

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Timers, solenoids, cam controls, pneumatic and hydraulic cylinders, switches and the like.

The above description and in particular the drawing serve primarily for explanation, but are not restrictive Effect. Various modifications and changes can easily be made by those skilled in the art. It it is therefore assumed that the above information is considered to be be considered exemplary.

In summary, the invention provides an apparatus for the continuous molding of molecularly oriented objects, generally there is provided a multi-station rotary table stretch blow molding machine in which a plurality of divisible blow molds are arranged at angular intervals around a continuously rotating support. Mold moving means for moving the mold sections of the molds between open and closed positions synchronous with the rotary movement of the support, adjusting devices for a stretching rod to reciprocate lengthways Moving a stretch rod within a mold cavity of each of the molds and second actuators for the stretch rod to push the rod out into the mold cavity and for withdrawing the stretching rod from it are provided. These adjusting devices for the stretching rod can be used in combination

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become effective nation and synchronously with the movements of form. A Another feature of the invention includes means for continuously and simultaneously feeding workpieces to a stretch blow molding machine and dispensing articles therefrom. From a procedural point of view, will the workpiece while it is at Molecular Oxygenation Temperature is temporarily held on or stored on any moving shape while an object is formed in the cavity of this mold from a previously supplied preform.

-Expectations-

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Claims (7)

Expectations (1.! Device for the continuous shaping of molecular-ori- ^ "^ tied objects, with a rack, one on the Frame for continuous rotary movement about a substantially vertical axis attached support structure, a plurality of radially divisible blow molds which are arranged at angular intervals on the support device and each defining a mold cavity, a drive means for the mold for moving the molds therebetween open and closed positions and an actuating device through which the drive devices for the shape can be synchronized with the rotation of the support device, characterized in that for each individual Form a stretch rod arrangement is provided, which in cooperation with the form drive devices with a single shape cooperates and a stretch rod actuator for longitudinal reciprocating movement a stretching rod, while this is in the cavity of the mold, and has a pressure medium device, which is associated with the stretching rod for expanding a workpiece in a shaped object, and that the support device has a vertical collecting 609840/0787 -30- 2611 ΟΛΟ and discharge chute in the vicinity of the cavity of each shape. 2. Apparatus according to claim 1, characterized in that the adjusting device for the stretching rod to Supporting the bottom of the stretching rod serving housing, which can be moved back and forth in cooperation with this is, and for the longitudinal movement of the housing and the stretching rod has a cam control which has a box guide, which is attached to the frame, and a follower roller moving in a cam slot of the guide which is operatively connected to the housing. 3. Device according to claim 1 or 2, characterized in that that a second adjusting device for the stretching rod for pushing out the stretching rods the mold cavity and for retraction from it is provided. 4. Apparatus according to claim 2, characterized in that the second adjusting device for the stretching rod for Pushing out the stretching rod into the cavity and a valve device for feeding it back therefrom of pressure medium to both sides of a piston which can be moved back and forth within the housing and which is fixed to the 609840/0787 -31- Stretching rod is attached and can be moved with it, and valve actuation means mounted on the frame for actuating the valve by the rotational movement the support device under pressure medium supply on the selected side of the piston for the longitudinal movement of the stretching rod is appropriate. 5. Apparatus according to claim 4, characterized in that the mold drive means a first guide rod assembly, the one on the frame for slidably supporting and guiding the two mold sections of the divisible mold attached, a second coupling rod assembly attached to and with one of the mold sections is movable in the lateral direction, and an adjusting device for lateral movement of the second coupling rod arrangement which has a transverse slot guide arrangement which is connected to the second coupling rod arrangement is a rotating shaft assembly for cooperation with the transverse slot guide assembly engaged therewith for reciprocating the connected second coupling rod assembly and a cam control to achieve a rotational movement of the rotary shaft synchronous with the movement of the support device, wherein the cam control a box guide, which is attached to the 6098A n / 0787 -32- Frame is attached, and has a follower roller that runs in a cam slot of the cam guide and is effectively connected to the shaft via lever devices. ----- ■. 6. Apparatus according to claim 5, characterized in that feed and output devices are provided by which preforms can be continuously fed to the molds and objects can be dispensed from the molds, and which is a plate arranged above the mold and movable to and fro in cooperation with the one mold section for optionally blocking the path of a preform into the mold cavity, a guide means that of the plate is assigned and is fixedly arranged above the plate and the center of the cavity so that they have a Picks up preform on the platen above the center of the mold cavity when the mold is closed, until the plate is moved beyond the center of the cavity, releasing the lock, one to the releasable one Holding a molded article in the one mold section while opening the section Moved mold, serving holding device, which has a protruding section on the upper part of the mold section and Has claw devices that are located on the bottom of the mold -33- Section are arranged and part of the shaped
Reaching around the object and interacting with it
can move back and forth, and has a release device associated with the claw device, through which the
Claw device is reversibly movable in the lateral direction against the object, so that this is released from the mold section when the mold is open and
the mold section is located above the dispensing opening in the support device. 7. Apparatus according to claim 6, characterized in that claw devices are provided which at the bottom of the
arranged second mold section and are movable in cooperation with this back and forth, and that the
Additional devices associated with claw devices of the second mold section are provided for moving the claw device to and fro in the lateral direction
against the article as the mold begins to open so that the article remains held on the first mold section for movement therewith. 609840/0787