EP1960180A1

EP1960180A1 - Post-treatment method and device therefor

Info

Publication number: EP1960180A1
Application number: EP06830152A
Authority: EP
Inventors: Witold Neter; Helmut THÖMMES; Christian Wagner; Rainer Petry; Stefan Schweininger
Original assignee: MHT Mold and Hotrunner Technology AG
Current assignee: MHT Mold and Hotrunner Technology AG
Priority date: 2005-11-30
Filing date: 2006-11-28
Publication date: 2008-08-27
Also published as: WO2007063063A1; DE102005057465A1

Abstract

The invention relates to a method for post-treating a blank (5) which is produced in an injection mould (5), wherein the blank is transferred from the injection mould to a receiving element (1). The aim of the invention is to provide a method for post-treating a blank which is produced in an injection mould and which enables an earlier removal from the injection moulding tool and also a predominantly damage-free post-treatment of the blank. The blank is maintained, at least temporally in a contact-free manner (12), by the receiving element.

Description

Aftertreatment process and device therefor

The present invention relates to a process for the aftertreatment of a molded article produced in an injection mold. Injection molding is one of the most important processes for the production of molded parts. In this case, the molding compound, which generally is originally present as powder or granulate, is heated, plasticized and forced under high pressure (several 100 bar) into a corresponding molding tool. The molding compound solidifies in the mold and is then removed from the opened tool.

For example, commercial PET bottles are generally made by stretch blow molding a hollow body preform or hollow preform. In this case, the hollow body preform is produced in a first step by means of injection molding. The stretch blow molding subsequent to the injection molding operation can be carried out either immediately after production of the hollow body preform or at a later time.

In the production of the corresponding injection molds, a great deal of effort is needed, since the injection mold on the one hand must be designed for very high pressures and on the other hand also must have correspondingly heated and / or cooled channels.

Usually, there is an injection mold for the production of PET preforms from a variety, for. B. 96, cavities are introduced into the appropriately trained tool cores. With the tool closed, i. when the core is inserted into the corresponding cavity, a space, the so-called mold space, is formed between the core on the one hand and the cavity on the other hand. In this room then the plasticized plastic, z. B. PET, injected under high pressure. Once the PET preform has cooled sufficiently, the mold can be opened and the preform removed.

In order to reduce the cycle times, ie the time from an injection to the next injection, it is already common practice to remove the preform at a very early stage from the mold to which the preform is already solid on its outer surfaces Area, the so-called soul, but still liquid. In this state, the preform is generally transferred to a so-called receiving plate, which consists of a group of receiving cavities. So it is, for example, in the so-called vertical tools, ie those injection molds that open by a vertical movement of a tool part relative to the other, usual, the tool shape already after z. B. to open 10 seconds, retract a receiving plate with corresponding receiving cavities in the mold, to let the individual preforms fall into the receiving cavities by gravity, to drive out the receiving plate with the preforms from the tool to close the mold and start the next injection molding , During the next injection molding process, the previous preforms remain in the receiving cavity, which is usually cooled.

There are also embodiments in which a gripper unit is retracted into the opened injection mold to grip the preforms and transfer them into the receiving cavities.

Since the preform for cooling in the receiving cavity of the prior art must remain a relatively long time, so that usually already the next preform can be removed from the injection mold before the preform is cooled in the receiving cavity so far that he without the risk damage can be taken, it is already common to use receiving plates having a plurality of groups of receiving cavities, each group having as many receiving cavities, as the injection mold preforms per injection cycle provides. The individual receiving cavities are then successively populated with preforms, so that the individual preform can remain longer than one injection cycle in the receiving cavity.

However, such mounting plates are correspondingly large and only very expensive to control.

In the known methods, however, the shortening of the cycle time limits, since the outer surfaces of the preform must already have a certain strength, otherwise in the transfer of the preform from the tool core in the receiving cavity of the receiving plate and the associated contact between preform and Aufnahmekavität the preform may be deformed.

Based on the described prior art, it is therefore an object of the present invention to provide a method for the aftertreatment of a molding produced in an injection mold, which allows early removal from the injection mold and also allows a largely damage-free aftertreatment of the molding. Post-treatment is to be understood below as any conceivable type of treatment of the molding after removal from the injection molding tool, such as, for example, cooling, tempering or deformation.

According to the invention, the stated object is achieved by a method for the aftertreatment of a molded article produced in an injection mold, in which the shaping from the injection mold is transferred to a receiving element, wherein the shaping is held at least temporarily essentially without contact by the receiving element.

For example, the receiving element may be a receiving cavity having an open and a closed end, the inner shape substantially corresponding to the outer shape of the molding, wherein the molding is at least temporarily held in the receiving cavity such that the molding does not completely penetrate into the receiving cavity, so that a large part of the outer surface of the molding does not touch the inner surface of the receiving cavity.

By not contacting the outer surface of the molding with the receiving cavity, the preform can be transferred in a state where the surfaces of the preform are still relatively soft. In this condition, contact between the preform and the receiving cavity could result in irreversible damage to the preform.

Therefore, in a preferred embodiment of the formation by means of a fluid, preferably by means of a gaseous fluid, which is introduced through an opening preferably in the vicinity of the closed end of the receiving cavity in this, prevented from coming into contact with the inner surface of the receiving cavity. In other words, for example, compressed air is introduced at the lower end of the receiving cavity, which prevents the molding from completely penetrating the receiving cavity, since it then closes the receiving cavity due to the substantial conformity of the outer shape of the molding with the inner shape of the receiving cavity would. In this condition, however, the pressure generated by the introduced compressed air would immediately raise the shaping again a little bit from the receiving capacity. It thus forms between receiving cavity on the one hand and shaping on the other hand, an air layer, which could also be referred to as air cushion. The shaping therefore floats above the receiving cavity and is held substantially solely by the air cushion.

In this case, it is ideally possible to allow no direct contact at all between the shaping and the receiving cavity. An unwanted deformation of the preform is prevented by the air cushion. - -

It is, of course, also possible to apply the molding to selected areas, e.g. on a neck ring to support, but it is important to ensure that not all of its own weight is applied to the support surface. It has been shown that with a very early removal of the molding from the mold, the already solid surface of the molding softens due to the still very hot soul again, so that a held only in the neck area molding change its shape again solely due to its weight can.

Basically, therefore, any direct contact is not desired. Nevertheless, during the transfer of the molded article from the tool into the receiving cavity or even during the aftertreatment of the molded article in the receiving cavity, there may be brief contact between the molded article and the receiving cavity. Although this is not desirable in principle, they still do not question the method according to the invention, since they only take place for a short time and, since the air cushion acts as a buffer, only with little force. In principle, the compressed air introduced through the opening into the receiving cavity, which flows along the outer surface of the molding, prevents complete penetration of the molding into the receiving cavity.

In general, it is sufficient if the receiving cavity has a feed opening for the corresponding fluid. However, it has been shown that the aftertreatment is particularly advantageous when a plurality of openings through which the fluid is supplied, are present. For example, the receiving cavity at its lower end an insert of porous material, for. B. sintered metal, have, so that the fluid is supplied through the many pores of the porous portion.

In a preferred embodiment, it is further provided that an aftertreatment pin, the outer surface of which at least partially coincides approximately with the inner shape of a cavity within the molding, is moved into the molding cavity. This post-treatment pen is intended for the post-treatment of the inner surface of the molding.

It is particularly expedient if at least temporarily a fluid, preferably a gaseous fluid, is introduced into the molding cavity through an opening in the aftertreatment pen. With the fluid then, for example, the molding cavity can be cooled. In a further particularly preferred embodiment, it is provided that fluid is introduced into the mold cavity during the movement of the aftertreatment post into the mold cavity, so that the molding is introduced by the outflowing fluid and substantially - -

is pressed further into the receiving capacity without direct contact between aftertreatment pen and molding. In other words, the movement of the molded article within the receiving cavity follows largely non-contact, so that the molding floats on the side of the receiving cavity on the air cushion provided by this, while the aftertreatment pen due to the built-up between aftertreatment pin and molding air cushion the molding further into the receiving cavity pushes.

Again, it is advantageous if the fluid is introduced through a plurality of openings, preferably via a porous element in the post-treatment pen in the molding. Alternatively, the entire post-treatment pen may be made of a porous material.

In a further particularly preferred embodiment it is provided that the molding is at least partially heated within the receiving cavity. It has been found that the quality of the molded article changes with regard to its physical or mechanical properties as a function of the speed and the uniformity of the cooling process. In order to prevent too rapid cooling of the surfaces of the molding, it may therefore be advantageous if the molding is heated at least in sections on its surface until the interior of the molding material, the so-called soul has also cooled to a certain temperature. In addition, depending on further planned processing steps, it may be advantageous if the shaped article, in particular in the form of a preform, is reheated after cooling, in order, for example, to permit further treatment by stretch blow molding. Furthermore, it may be expedient if the molding is cooled at least in sections within the receiving cavity.

With regard to the aftertreatment of a preform, the object mentioned at the outset is achieved, in particular, by a method which has the following steps:

a) introducing the preform into a receiving cavity whose inner surface approximately corresponds to the outer surface of the preform, b) introducing a fluid into the receiving cavity via an opening in the vicinity of the closed end of the receiving cavity, c) forming a fluid cushion between preform and receiving cavity, d) holding the preform in suspension without significant direct contact between preform and receiving cavity. It is also possible and, for some applications, to carry out step b) during step a). Thus, it is already possible to prevent contact between the preform on the one hand and the receiving cavity during transfer of the preform from the tool mold into the receiving cavity.

However, there are also tool shapes, in particular so-called horizontal tools, in which the preform can not be transferred by gravity into the receiving cavity. The transfer then takes place, for example, at a time when the receiving cavity is oriented not horizontally but horizontally. If one were to introduce a fluid into the receiving cavity during step a), this could cause premature ejection of the preform from the receiving cavity. It is therefore expedient here for the fluid to be introduced only when the receiving cavity has been moved out of the tool mold and brought into a vertical position.

Once the preform is held without significant direct contact in the balance between preform and receiving cavity solely by the fluid pad provided, is provided in a particularly preferred embodiment that an aftertreatment pin is introduced into the preform whose outer contour substantially corresponds to the inner contour of the preform (Steps).

The aftertreatment pin retreads the inner contour of the preform, i. either reshaped or postcooled or possibly even heated.

It is particularly preferred if the treatment pin has one or more openings at its tip and / or at its side surfaces and fluid flows out of the one or more openings of the aftertreatment pin when the aftertreatment pin is immersed in the preform. It is particularly expedient if a fluid cushion is also formed between the outer surface of the aftertreatment pin and the inner surface, so that the preform is pressed into the receiving cavity substantially solely via the fluid cushion without significant direct contact between preform and aftertreatment pin (step f). ,

The surface of the preform can still be so soft in this process that through the

Fluid pad it comes to a surface smoothing. This is particularly advantageous in the lower region of the preform, that is to say on the outer side of its closed end, since unevenness in the preform is frequently present here due to the injection point or the gate. By the fluid cushion and this unevenness can be eliminated, so that the injection point in the finished inflated bottle is virtually unrecognizable.

In a further particularly preferred embodiment, the aftertreatment pin is finally moved into the receiving cavity so far that the outer preform wall comes into contact with the inner wall of the receiving cavity (step g). At that moment, the preform gets its final shape. It is possible in this case that the inner wall of the preform comes into contact with the outer surface of the post-treatment pin. However, this is not essential. The best results were obtained in tests when only contact between preform and receiving cavity but not between preform and aftertreatment pen.

If the preform has already been adequately aftertreated before the contact step described, the molding step, i. the moment in which the aftertreatment document is completely inserted into the receiving cavity, lasting less than 2 seconds, preferably less than 1 second, more preferably less than 500 milliseconds. Then the preform has its final shape and the aftertreatment pin is now moved out of the receiving cavity again. The preform can now either be removed from the receiving cavity or it can be transferred back into the "floating" state already described above, in which a controlled cooling of the preform is effected due to the fluid.Of course, it is also possible that the preform remains in contact with the receiving cavity on its outside.

Expediently, the supply of fluid is interrupted at the moment in which the outer preform wall comes into contact with the inner wall of the receiving cavity.

It has also proved advantageous for some applications when the fluid introduced into the receiving cavity and / or the fluid introduced into the aftertreatment pen is heated. By heating the fluid, a post-deformation of the preform can take place and thus smaller inaccuracies in the surface of the preform can be removed.

In a further particularly preferred embodiment it is provided that the preform in

Step f) or g), that is compressed in its axial length during the movement of the Nachbehandlungsstiftes into the receiving cavity of the preform. This is of great advantage in particular if, during this step, a section of the preform to a first Temperature T ₁ and a portion of the preform is brought to a second temperature T ₂ , wherein T _{1 is} greater, preferably greater by at least 10 ° C and more preferably at least 20 ° C greater than T ₂ . For example, the warmer portion could be located closer to the neck portion of the preform than the colder portion. This has the consequence that the preform cools relatively quickly in its lower region, so that the upsetting of the preform along its axial length substantially in the warmer portion which is located closer to the neck portion, takes place. As a result, this section will have a slightly higher wall thickness than the lower section of the preform. Such an uneven thickness of the preform may be desirable if the bottle to be produced in a further process step should have reinforcing ribs in a certain area, so that an increased amount of material is required in this area.

In principle, it would also be possible to equip the preform in the injection mold with a sectionally larger wall thickness, but the wall thickness is the criterion determining the cycle time, so that an increase in the wall thickness of the preform in the mold always results in an extension of the cycle time draws. By the procedure according to the invention, it is possible to give the preform finally an increased wall thickness, without causing an extension of the cycle time.

Furthermore, the aftertreatment pin is advantageously designed such that it closes the preform in a substantially sealing manner when the position is moved completely into the receiving cavity.

In a further preferred embodiment, following the inward movement of the aftertreatment pen, the aftertreatment pen is again moved out of the receiving cavity, a fluid is supplied through the opening of the receiving cavity, and the aftertreatment pen is connected to a vacuum source so that the preform engages the aftertreatment pen from the receiving cavity emotional.

Furthermore, it is advantageous if a sleeve element is provided which surrounds the preform in the threaded section and the sleeve element is connected after the post-treatment with a vacuum source to remove the preform from the receiving cavity.

Furthermore, it can be advantageous immediately after the aftertreatment of the preform which is to be inflated into the final bottle shape if, for the removal of the preform from the receiving cavity, a stretching rod, as used in blow molding, is used the preform is introduced, the preform by means of the stretching rod and a vacuum applied in an opening in the stretch rod, is removed from the receiving cavity and finally the stretching rod together with preform is placed in a die and the preform is stretched in the die and inflated to a PET bottle or other object to form.

With regard to the device, the object mentioned is achieved by a system for the aftertreatment of a molded article produced in an injection mold, in which a holding device is provided for substantially non-contact holding of the molded article.

Furthermore, in a preferred embodiment, the holding means on a receiving cavity having a closed and an open end for receiving the molding, wherein the inner shape of the receiving cavity is adapted so that it corresponds substantially to the outer shape of the male molding, and the shaping in the Cavity is held such that the majority of the outer surface of the molding does not come into contact with the inner surface of the receiving cavity.

It is advantageous if the holding device ensures a distance between the outside of the molding and the inner surface of the receiving cavity between about 1 mm to about 5 mm.

In a particularly preferred embodiment, the holding device is formed by at least one opening in the receiving cavity, which is connectable to a fluid supply. If a fluid is supplied via the opening in the receiving cavity, the fluid ensures that the shaping can not penetrate completely into the receiving cavity and therefore also does not touch the inner surface of the receiving cavity. The holding of the molding is thus carried out by the supplied fluid without the need for a direct physical contact between the molding and Aufnahmekavität.

The at least one opening in the receiving cavity is preferably arranged in the vicinity of the closed end. Conveniently, the receiving cavity is at least partially formed of porous material.

Furthermore, in a particularly preferred embodiment, a cooling device is provided for cooling the receiving cavity and / or the fluid to be supplied. Additionally or al- Alternatively, a heating device for heating the receiving cavity and / or the fluid to be supplied can also be provided.

Furthermore, in a particularly preferred embodiment, an aftertreatment pen is provided, which can be moved into the receiving cavity. It is advantageous if the post-treatment pin has at least one opening, preferably in the region of its tip, which can be connected to a fluid supply, wherein the post-treatment pin preferably consists of a porous material. The aftertreatment pen, in a preferred embodiment, is designed to push a forming farther into the receiving cavity without substantial contact between the post-treatment pen and the forming. This pushing in takes place solely on account of the fluid cushion, which necessarily forms through the supply of the fluid through the opening in the aftertreatment pen between aftertreatment pen on the one hand and shaping on the other hand.

Furthermore, in a particularly preferred embodiment, a cooling device is provided for cooling the post-treatment pin and / or the fluid to be supplied by the post-treatment pin. Additionally or alternatively, a heating device for heating the post-treatment pin and / or the fluid to be supplied through this can also be provided.

The system according to the invention is preferably designed to hold the shaping at least temporarily essentially exclusively by the fluid supplied by means of the receiving cavity on the one hand and the aftertreatment pen on the other hand.

The system described is particularly advantageous in the after-treatment of preforms, which are subsequently inflated to corresponding bottles or other objects. The receiving cavity expediently has a ring element with preferably conically widening inner or outer surface which surrounds the open end of the receiving cavity. Finally, a sleeve element is preferably provided, which surrounds the aftertreatment pin and is particularly preferably designed such that the sleeve element comes into contact with the neck section of the preform to be post-treated when the aftertreatment pin moves completely into the receiving cavity.

In this case, in a further particularly preferred embodiment, the ring element of the receiving cavity and the sleeve element of the adjacent post-treatment pin are formed with mutually corresponding preferably conically widening surfaces which upon immersion of the post-treatment pin in the receiving cavity contact each other and ensure a centering of the post-treatment pin with respect to the receiving cavity.

Further advantages, features and applications of the present invention will become apparent from the following description of a preferred embodiment and the accompanying figures.

FIGS. 1 to 4 each show a snapshot of the method according to the invention.

In Figure 1, a receiving cavity 1 is shown having a lower, closed end and an upper, open end. Within the receiving cavity, a cooling channel 2 is arranged, which allows cooling of the receiving cavity, for example by means of cooling water. The bottom of the receiving cavity 1 is formed by a porous insert 3. Finally, below the porous insert 3 is a feed 4 for a fluid, for. B. compressed air shown. Through the feed 4, compressed air can be introduced into the receiving cavity 1, which is distributed through the porous material and enters the receiving cavity 1 in the lower region of the receiving cavity from the porous material. The receiving cavity is provided for receiving a preform 5, which has been schematically drawn here. The preform 5 has a threaded portion 6, a neck ring 7 and a lower portion 13. The outer surface of the lower portion 13 of the preform 5 substantially corresponds to the inner surface of the receiving cavity 1. To remove the preform 5 from the mold, it is first opened and then retracted a plate with corresponding receiving cavities in the mold. The preform 5 is then transferred to the receiving cavity 1. Due to the air flow 12 generated by the compressed air applied to the feeder 4, the preform 5 is held in suspension, so that it has almost no contact with the inner surface of the receiving cavity 1. The air flow is shown schematically in Figure 1 by arrows.

The receiving cavity 1 is moved out after the transfer of the preform 5 in the receiving cavity 1 from the mold. This can now be used to produce another preform 5. Meanwhile, an aftertreatment pin 9 is placed in the preform. This condition is shown in FIG. It can be clearly seen that the preform does not touch either the receiving cavity 1 or the aftertreatment pen 9. The aftertreatment pin 9 is also made of porous material and with a corresponding supply for a fluid, eg. B. compressed air connected. It thus forms between the post-treatment pin 9 and the preform 5, an air cushion. In this state, which is shown in Figure 2, the preform 5 can be treated. The supplied fluid can be tempered accordingly. This tempering can be done for example by means of a resistance heater, for example in the form of a heating coil. The course of the fluid flow 12 is also indicated here by arrows.

In Figure 3, the step of final formation of the shape of the preform is shown. Here, the post-treatment pen 9 is inserted as far as possible into the receiving cavity 1 for a short moment. In this situation, the preform 5 does not touch the inner wall of the receiving cavity 1, but not the outer wall of the post-treatment pin 9. It can be clearly seen that the post-treatment pin 9 is equipped with a sleeve element 10. Arranged annularly around the receiving cavity is a ring element 8. The sleeve element 10 is designed so that it comes into contact with the neck ring 7 of the preform in the position shown in FIG. The ring element 8 and the sleeve element 10 are each provided with conical surfaces which correspond to one another in such a way that they come into contact with one another in the position shown in FIG. 3 and ensure centering of the aftertreatment pin 9 within the receiving cavity 1. In the position shown in Figure 3, the upper edge of the preform 5 comes into contact with the sleeve bottom 11 of the sleeve member 10, so that around the threaded portion 6 of the preform 5 between the preform on the one hand and the surrounding sleeve member 10 on the other hand forms a closed chamber. If necessary, this closed chamber can be connected to a vacuum source in order to remove the preform 5 from the receiving cavity 1 in a further step.

The state shown in Figure 3 is maintained only for a very short moment, preferably for less than 1 second. During this moment, the fluid supply is expediently switched off. Then the aftertreatment pin 9 is again moved out of the preform 5, so that approximately the position shown in Figure 4 results. By applying the pressurized fluid to the aftertreatment pin 9, fluid is circulated around the inside of the preform again. In this state, the preform can be further cooled due to the fluid supply. The outside of the preform is cooled by direct contact with the water-cooled receiving cavity 1. However, it is also possible to establish a vacuum in the region of the base section 11 and / or via the aftertreatment pin 9, so that the preform 5 is attracted upward in the direction of the aftertreatment pin 9. The preform 5 can now be removed with the aftertreatment pin 9 from the receiving cavity 1. LIST OF REFERENCE NUMBERS:

1) receiving cavity

2) cooling channel

3) porous use

4) Feeder

5) P reform

6) threaded section

7) neck ring

8) Ring element

9) Post-treatment pen

10) sleeve element

1 1) sleeve bottom

12) fluid flow

13) Lower area of the preform

Claims

- Patent claims

1. A method for the aftertreatment of a molded article produced in an injection mold, wherein the shaping of the injection mold is transferred to a receiving element, characterized in that the shaping is at least temporarily held without contact by the receiving element.

2. The method according to claim 1, characterized in that the receiving element is a receiving cavity (1) having an open and a closed end whose inner shape substantially corresponds to the outer shape of the molding, and the molding is held such that the molding is not completely penetrates into the receiving cavity (1), so that a large part of the outer surface of the molding does not touch the inner surface of the receiving cavity.

3. The method according to claim 2, characterized in that the shaping by means of a fluid, preferably a gaseous fluid, which is introduced through an opening preferably in the vicinity of the closed end of the receiving cavity (1) in this, is prevented from, with the inner surface the receiving cavity (1) to come into contact.

4. The method according to claim 3, characterized in that compressed air is introduced through an opening in the receiving cavity (1) and flows around the shaping on its outer surface and thus prevents it from completely penetrate into the receiving cavity (1).

5. The method according to claim 3 or 4, characterized in that the fluid is introduced through a plurality of openings, preferably through a porous portion (3) in the receiving cavity (1).

6. The method according to any one of claims 1 to 5, characterized in that a post-treatment pin (9) whose outer surface at least partially coincides approximately with the inner shape of a cavity within the molding, is moved into the molding cavity.

7. The method according to claim 6, characterized in that through an opening in the aftertreatment pin (9) at least temporarily a fluid, preferably a gaseous

Fluid is introduced into the molding cavity. - -

8. A method according to claim 7, characterized in that during the movement of the aftertreatment pin (9) into the molding cavity, fluid is introduced into the molding cavity, so that the shaping by the outflowing fluid and substantially without direct contact between aftertreatment pin (9). and molding is pushed further into the receiving cavity.

9. The method according to any one of claims 6 to 8, characterized in that the fluid is introduced via a plurality of openings, preferably via a porous element (3) in the aftertreatment pin (9) in the shaping.

10. The method according to any one of claims 2 to 9, characterized in that the shaping within the receiving cavity (1) is at least partially warmed up.

1 1. A method according to any one of claims 2 to 9, characterized in that the molding within the receiving cavity (1) is cooled at least in sections.

12. A method for post-treatment of a preform (5) after it has been taken from a tool mold which comprises the following steps: a) introducing the preform (5) into a receiving cavity (1) whose inner surface corresponds approximately to the outer surface of the preform b) introducing a fluid into the receiving cavity (1) via an opening in the vicinity of the closed end of the receiving cavity (1), c) forming a fluid cushion between the preform (5) and receiving cavity (1), d) holding the preform (5) in suspension without significant direct contact between see preform (5) and receiving cavity (1).

13. The method according to claim 12, characterized in that step b) is already performed during step a).

14. The method according to claim 12, characterized in that step b) is carried out only after the completion of step a).

15. The method according to any one of claims 12 to 14, characterized in that at

Step d) the step e) introducing a post-treatment pin (9) whose outer contour substantially corresponds to the inner contour of the preform (5), in the preform (5) connects.

16. The method according to any one of claims 12 to 14, characterized in that at step d) the step e) providing an aftertreatment pin (9) whose outer contour substantially corresponds to the inner contour of the preform (5) and at its

Having tip and / or at its side surfaces one or more openings, flow out of fluid from the one or more openings of the aftertreatment pin (9) and immersion of the aftertreatment pin (9) in the preform (5) adjoins.

17. The method according to claim 16, characterized in that at step e) the step f) forming a fluid cushion between aftertreatment pin (9) and inner surface of the preform (5) and pushing the preform (5) into the receiving cavity (1) substantially connected solely via the fluid pad without significant direct contact between preform (5) and post-treatment pen (9).

18. The method according to claim 17, characterized in that step f) is followed by step g) moving the aftertreatment pin (9) far into the receiving cavity (1) that the outer Preformwand with the inner wall of the receiving cavity (1) comes into contact ,

19. The method according to claim 18, characterized in that in step g) the aftertreatment pen after a time interval of less than 2 seconds, preferably less than 1 second, more preferably less than 500 milliseconds is pulled back a little bit from the receiving cavity.

20. The method according to claim 18 or 19, characterized in that step b) is interrupted at least in the moment in which the outer preform wall with the inner wall of the receiving cavity (1) comes into contact.

21. The method according to any one of claims 12 to 20, characterized in that the fluid which is introduced into the receiving cavity (1), and / or the fluid which is introduced into the aftertreatment pin (9) is heated.

22. The method according to any one of claims 18 to 21, characterized in that the preform (5) in step g) is compressed in its axial length.

23. The method according to claim 22, characterized in that during step g), a portion of the preform (5) to a first temperature T ₁ and a portion of the preform (5) is brought to a second temperature T ₂ , wherein T _{1 is} larger , preferably at least 10 ° C greater and more preferably at least 20 ° C greater than T ₂ .

24. The method according to claim 23, characterized in that the warmer portion is arranged closer to the neck portion of the preform (5) than the colder portion.

25. The method according to any one of claims 15 to 24, characterized in that the aftertreatment pin (9) is designed such that it closes the preform (5) substantially sealingly when fully in the receiving cavity (1) in moving position.

26. The method according to claim 25, characterized in that subsequent to the introduction of the Nachbehandlungsstiftes (9) of the aftertreatment pin (9) again from the

Receiving cavity (1) is moved, a fluid is supplied through the opening of the receiving cavity (1) and the post-treatment pin (9) is connected to a vacuum source, so that the preform (5) with the post-treatment pin (9) from the receiving cavity (1 ) emotional.

27. The method according to any one of claims 15 to 26, characterized in that a sleeve member (10) is provided which surrounds the preform (5) in the threaded portion and the sleeve member (10) is connected after the post-treatment with a vacuum source to the preform (5) from the receiving cavity (1).

28. The method according to any one of claims 13 to 27, characterized in that a stretch rod is introduced after the post-treatment in the preform (5), the preform (5) by means of the stretch rod and vacuum from the receiving cavity (1) is removed, the stretching bar together with the preform (5) is introduced into a die and finally the preform (5) is stretched and inflated in the die to form a plastic bottle.

29. System for the aftertreatment of a molded article produced in an injection mold, characterized in that a holding device is provided for substantially non-contact holding of the molded article.

30. System according to claim 29, characterized in that the holding device has a receiving cavity (1) with a closed and an open end for receiving the molding, wherein the inner shape of the receiving cavity is adapted so that it is substantially the outer shape of the male molding to be formed, and the molding in the cavity (1) is held such that most of the outer surface of the molding does not contact the inner surface of the female cavity (1).

31. System according to claim 30, characterized in that the holding means a distance between the outside of the molding and the inner surface of the receiving cavity (1) between see see about 1 mm to about 10 mm guaranteed.

32. System according to claim 30 or 31, characterized in that the holding device is formed by at least one opening in the receiving cavity (1) which is connectable to a fluid supply.

33. System according to claim 32, characterized in that the at least one opening in the receiving cavity (1) is arranged in the vicinity of the closed end.

34. System according to claim 32 or 33, characterized in that the receiving cavity (1) at least partially made of porous material (3), which forms the at least one opening.

35. System according to one of claims 32 to 34, characterized in that a cooling device (2) is provided for cooling the receiving cavity (1) and / or the zuzufüh- this fluid to be supplied.

36. System according to one of claims 32 to 35, characterized in that a heating device is provided for heating the receiving cavity (1) and / or the fluid to be supplied via this.

37. System according to any one of claims 30 to 36, characterized in that an aftertreatment pin (9) is provided, which is hineinbewegbar in the receiving cavity (1).

38. System according to claim 37, characterized in that the aftertreatment pin (9) has at least one opening, preferably in the region of its tip, which can be connected to a fluid supply, wherein the aftertreatment pin (9) is preferably made of a porous material.

39. System according to claim 38, characterized in that the aftertreatment pin (9) is adapted to push a molding further into the receiving cavity (1) without substantial contact between aftertreatment pin (9) and receiving cavity

(1 )-

40. System according to one of claims 38 to 39, characterized in that the system is designed to hold the shaping at least temporarily substantially exclusively by the means of Aufnahmekavität (1) on the one hand and post-treatment pen (9) on the other hand supplied fluid.

41. System according to one of claims 37 to 40, characterized in that a cooling device is provided for cooling the post-treatment pin (9) and / or the fluid to be supplied via this.

42. System according to any one of claims 37 to 41, characterized in that a heating device is provided for heating the post-treatment pin (9) and / or the fluid to be supplied via this.

43. System according to any one of claims 29 to 42, characterized in that the system for the post-treatment of preforms (5) is provided.

44. System according to claim 43, characterized in that the receiving cavity (1) has a ring element (8) preferably with a conically widening inner surface, that the open end of the receiving cavity (1) surrounds.

45. System according to any one of claims 37 to 44, characterized in that a sleeve element (10) is provided, which surrounds the aftertreatment pin (9) and is preferably designed such that the sleeve element (10) is completely inserted into the receptacle. - -

Cavity (1) moved in Nachbehandlungsstift (9) with the neck portion of the nachzubehandelnden preform (5) comes into contact.

46. System according to claim 45, characterized in that the ring element (8) of the receiving cavity (1) and the sleeve element (10) of the aftertreatment pin (9) have mutually corresponding surfaces which, upon immersion of the aftertreatment pin (9) in the receiving cavity ( 1) contact each other and ensure a centering of the post-treatment pin (9) with respect to the receiving cavity (1).