DE2339019A1 - METHOD AND APPARATUS FOR MANUFACTURING HOLLOW BODIES BY INFLATING PREFORMES - Google Patents

Description

PATENT LAWYERS

DR. ING. VAN DER WERTH DR. FRANZ LE DE RE R

21 HAMBURG 9O 8 MUNICH

«FlLSTORFER ST«. SS ■ TEL. CO « III 77 OS 6! O 1 OO Π 1 Λ 1- "C ₁ LE-GRAHN-STR-Ua-TEL. .08 111 47 29

July 30, 1973

M / jb

IBS VI

Applicant · 4 P Verpackungen GmbH, 8960 Kempten / Allgäu Ulmer-Str. 18th

Method and device for the production of hollow bodies by inflating preforms

The invention relates on the one hand to a method for producing Hollow bodies, in particular of bottles, preferably of pressure-resistant bottles, such as those used, for example, for holding carbonated ones Beverages are suitable by inflating thermoplastic material through an injection nozzle into it a preform with a mandrel made preforms, where appropriate by a series of coordinated measures a temperature profile over the length of the preform is produced. On the other hand, the invention also relates to a device for producing such hollow bodies by inflation from preforms made of thermoplastic material previously produced within the device containing an injection molding device, an injection nozzle, a preform and a mandrel which can be introduced into this for the production of the preforms, and a Blow mold that can be attached around the mandrel for inflating the preforms, with means for supplying or removing heat on the Preform, on the preform, on the injection nozzle and on the mandrel

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in terms of their effectiveness and, if necessary, control coupled to one another or coordinated with one another, that the successively to be produced in the device and further to treating preforms can be given a constant temperature profile from preform to preform over the length of the preforms is. The device to be provided according to the invention is in particular for carrying out the method according to the invention determined and suitable.

For various further processing purposes into end products, for example for bottles, preforms, in particular made of thermoplastic material, for example PVC, are required and used, further processing begins almost immediately, i.e. only with the interposition of preparatory steps the production of the preforms follows. As a rule, production and further processing are carried out by means of a single one appropriately designed device. Such a device then consists of a device that can be connected to a conventional injection molding device Preform with an injection nozzle, with a mandrel being able to be introduced into the preform in order to produce the preform from the factory to give a certain hollow shape. After its production, the preform remains on the mandrel and becomes together with it removed from the preform and another workstation of the Device supplied. At this station and, if necessary, at other intermediate stations, a preparatory treatment is initially carried out carried out, so that the final processing to the hollow body, for example by inflation, only on one further station takes place. At this last-mentioned station, one of the final shape of the desired hollow body is obtained Blow mold guided around the mandrel and the preform,

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the inflation carried out, the blow mold carried away again and the finished hollow body removed from the mandrel.

In this production of the hollow body it is both in terms of their later usability as well as with regard to a reject-free production, especially in the context of a series production, It is of very considerable importance that the preforms initially produced enter the hollow bodies until they are inflated have a special temperature profile in the direction of their longitudinal axis. Based on the fact that the temperature change due to the temperature of the starting material heated to the processing temperature of the plasticized material when it is injected into the preform for the preform, the environmental conditions in the vicinity of a corresponding production facility and the like. built up a certain temperature profile of the preform from the start is, however, at the same time it can be seen that this temperature profile is relatively stronger in the context of series production May be subject to fluctuation. Because the influencing variables just mentioned are subject to considerable fluctuations or changes. Since every preform has a specific, optimal temperature profile with regard to its inflation must, care must therefore be taken that this temperature profile is maintained from preform to preform it is necessary to include the production of the preform in the structure of the temperature profile, otherwise the between production and inflation lying treatment already very different preforms would be fed, whose piece by piece alignment would not be possible.

With a view to the fact that the inflation leads to the desired end product hollow bodies Preforms that are as completely identical as possible

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are supplied with an optimal temperature profile, so that the process can be carried out trouble-free and scrap-free, in particular in the context of a series or large-scale production with a correspondingly high output rate or a correspondingly short cycle time, is generically specified in the case of the initially specified Procedure for the mutual coordination of a number of measures provided. For such measures, a cooling of the Preform after its production in several places on its circumference and bottom as well as a regulation of the temperature of the preform, The mandrel and injection nozzle and the supply of heat by friction in the injection nozzle.

In an earlier application that was not previously published (P 22 61 226.6) the applicant has already proposed in connection with the generic method described at the beginning that the preform after · its production selectively blown with hot or cold air will. In a further development of this proposal, the applicant has also proposed that the air blowing should be oriented in this way • is that a possibly occurring unilateral convection it compensates or prevents that each preform is blown around helically, that the intensity of the action the blown air is varied over the length of the preform and / or that the variation of the intensity of the action of the blown air on the preform by designing the gap width or slope of the guide plates, the blowing angle and / or the angle is effected by air ducts.

At the same time, the applicant has in the same earlier application in terms of device technology in connection with the above The device described generically also proposed that means for selective blowing of the preform

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are provided with hot or cold air that the blowing means are aligned such that any unilateral convection that may occur compensates or its formation is prevented at all, that means are provided for helical blowing around the preforms, that the means for helical blowing from a actual blowing means and a means for helically guiding the blowing air and / or that the means for helically guiding the blowing air consist of a hollow mold to be arranged at a distance around the preform, the space between the inner wall of the hollow mold and the preform being connected to the actual blowing means .

The present invention is in view of the known relationships the object is based on the aforementioned method and the associated device, each also in their by the earlier application further ^ formed shape to improve such that the preform after its manufacture and before its. Inflation to the final hollow body in the simplest possible and at the same time very perfect way that which is optimal for the inflation Temperature profile is notifiable.

From a procedural point of view, this task is solved by that the preform after its production inside a tempering mold by heat exchange by way of contact heat conduction and / or radiation is tempered with this. This temperature control can either be through contact heat exchange, i.e. through mutual contact of preform and tempering mold and / or take place by radiation. Here is the size of the heat exchange of course its duration and the temperature difference between preform and tempering mold and their surface

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quality and in the case of heat exchange through radiation the respective absolute temperature is important. At the same time by the fiction proposed according to temperature control inside A tempering mold achieved that the preform is removed from environmental influences during this phase of the manufacture of the hollow body that would have a negative effect on the development of the necessary temperature profile.

In a further development of the fiction, contemporary method, it is advisable to provide that the heat exchange between the preform and, viewed in the longitudinal direction of the preform, the tempering mold is carried out qualitatively and / or quantitatively differently. This is particularly important because the preform already has a certain temperature profile after it has been injection molded has that must be changed differently at different points in the longitudinal direction of the preform, including in part an increased supply of heat and / or sometimes even a simultaneous dissipation of heat at other points is necessary.

With a view to the fact that the fiction, contemporary method must be executable in a way that is part of a large-scale production allows the shortest possible cycle times, and that the time necessary for the temperature control of the preform is usually a Several times the time required for injection molding the preform and the time required for cooling the finished blown hollow body is, it should also be provided to carry out the temperature control of the preform in several stages. This is how it is then It is possible that the cycle time in which the method according to the invention can be carried out does not differ from that for the temperature control of the preform time required, but rather from the time required for the injection of the preform or the time required for the cooling of the finished blown one

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Hollow body required time is determined, so as short as possible is.

In a further development it can then be provided that in the individual Tempering stages a different heat exchange between the associated tempering molds and the preform will. It is then possible, for example, to provide a relatively large heat exchange in a first temperature control stage, as a result, the temperature control of the preform, i.e. the inner wall area of the preform facing away from the temperature control mold naturally takes a longer period of time, can be tempered more quickly, with the one facing the tempering mold, i.e. outer wall area of the preform possibly heated too much or is cooled, which can be compensated for in the next temperature control stage. For this compensation it is in the next temperature control stage then possible to provide a smaller heat exchange, which then does not or only hardly affects that of the Tempering mold facing away from the inner wall area of the preform extends.

In order to considerably improve the temperature control, it is also proposed that the preform be removed during the temperature control is inflated. As a result of this inflation, the area of the preform that is exposed to the temperature control becomes considerable enlarged and, on the other hand, at the same time the wall thickness of the preform is correspondingly considerably reduced, so that overall significantly shorter times are required for temperature control. In addition, this also achieves that for Achieving a certain temperature control time no very large temperature differences, must be provided between the tempering mold and preform, as a result of which, for example, over-

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Heating or supercooling of the outer wall area of the preform facing the tempering mold can occur.

In connection with the multi-stage formation of the temperature control and the inflation of the preform during the temperature control should then also be provided that the preform continuously stages during successive tempering is inflated to larger diameters. This enables the preform not only with regard to its temperature profile, but also with regard to its shape, which is assumed during each temperature control stage, gradually changes to the final shape or shape. Approximate size of the finished hollow body, so that in the first temperature control stages, in which the current temperature profile from final temperature profile still differs relatively strongly, no particular overstretching of the preform can occur. In the brief moments between the individual temperature control stages, the preform can optionally be relieved of the inflation means and again take on its originally injected shape.

Depending on whether the heat exchange to be provided for tempering the preform is by means of radiation or by direct contact heat transfer is to be carried out, it is to be provided that the preform maintains a distance from the inner wall of the tempering mold or comes to rest against this inner wall, which can be controlled very well, in particular by means of the inflation of the preform is.

In terms of device technology, the invention provides a solution of the relevant part of the underlying task before tempering forms, within which a heat exchange with the Preform is executable.

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A further development of this device designed according to the invention is characterized by such a design of the tempering molds that, viewed in the longitudinal direction of the preform, a qualitative and / or quantitatively different heat exchange with the Tempering form is executable. With regard to the advantages achieved in this way, reference is made to the above remarks on the invention Referenced procedure.

The just mentioned formation of the tempering molds can advantageously consist in that the inner wall of the tempering mold seen in the longitudinal direction of the same in zones of different temperatures or in zones of materials of different Heat transfer coefficient is divided. Of course, these two training courses can also be carried out at the same time be realized. In this case, temperature control is independent of an individual or simultaneous implementation of these trainings of the preforms in the manner prescribed by the method explained in more detail above without further difficulties possible.

Furthermore, it can be provided that the preform located on a mandrel is successively passed through tempering molds have increasingly larger internal dimensions. This is particularly a prerequisite with regard to the following specified development of the device according to the invention of importance.

With regard to the inflatability of the preforms already indicated in connection with the method according to the invention can furthermore be provided in terms of device technology that the mandrel carrying the preform after assignment

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to a tempering mold of blowing agent for inflating the preform connected.

Regarding the advanced training measures just specified the advantages achieved by the device according to the invention is referred to the corresponding information in connection with the inventive device Referenced procedure.

In the following the invention is described in more detail with reference to the drawings; in this shows:

1 shows a vertical cross section through a device for the production of Hollow bodies in only partial representation, in which the temperature control of the preform according to the invention can be provided

Fig. 2 shows the device of FIG. 1 with the improvements according to the Invention,

3 shows another which can be used in the context of the present invention Device for the production of hollow bodies in side view, in which in turn the fiction, contemporary Temperature control of the preforms can be provided,

FIG. 4 is a view of the device of FIG. 3 seen from the line IV-IV,

5 shows a part of the device of FIGS. 3 and 4 designed according to the invention,

6 shows a longitudinal section through a tempering mold and

7 shows a longitudinal section through a further tempering mold.

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In the known device shown in Fig. 1 is between an injection mold arranged at a first work station for producing the preforms via an injection nozzle a conventional injection molding device 12, shown only schematically, of which only the plasticizing and injection screw 3 can be seen, is connected downstream, and a blow mold 11 arranged at a further work station for inflating the preforms from two half-shells 60, 6] a revolving mandrel carrier 3 with several mandrels 5 is provided. This mandrel revolver 3, this one Injection mold 9 and the blow mold 11 are movable such that each individual mandrel 5 successively the two work stations of the device is feedable. Furthermore, the shaft 6 of the mandrel carrier 3 can also be seen and, in addition, a channel 70, that for supplying the blown air from the hollow mandrel support shaft 6 to the mandrel located in each case in the blow mold 11 serves. Such a channel 70 is of course provided in connection with each of the mandrels 5, only from the drawing Reasons, however, only shown in connection with the mandrel 5 currently located in the blow mold 11. The arrow F gives the Direction of rotation of the revolver-shaped mandrel carrier 3.

FIG. 2 shows the device of FIG. 1 just described after its further development according to the invention. The further training exists in that on the two unoccupied in FIG. 1 and in the direction of rotation of the arrow F between the injection mold 9 and the blow mold 11 located work stations now tempering molds 10 are provided. The blow mold 11 is diametrically here opposite tempering mold 10 to one that serves to exchange heat with the one on the respective Perform mandrel 5 located preform by radiation; i.e. the interior of this tempering form 10 is accordingly

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larger than the exterior of the preform located on the respective mandrel. In contrast, it is the case of the injection mold 9 diametrically opposite tempering mold 10 around one which is used for the preform located on the respective mandrel 5 to control the temperature by way of contact heat conduction. The interior of this tempering mold 10 is corresponding again designed larger than the exterior of the preform, the Preform for mutual contact with the inside of the tempering mold via the in connection with FIG. 1 in more detail explained blow channel 70 is to be inflated.

Not affected by the design of the device according to the invention Detailed devices of the known device shown in FIG. 1 for the production of hollow bodies by inflation Plastic are not specified in the drawing; this also applies to FIG. 2. This is the one on the revolver-shaped Mandrel carrier to be provided supply and discharge channels for means for heating or cooling the mandrels 5 and around the Movement mechanisms for the injection mold 9 and the two-part blow mold 11 as well as those movement mechanisms for step-by-step advancement of the mandrel carrier 3.

The device shown in FIG. 3 is a Device designed as a twin system for the production of hollow bodies by inflating one made of thermoplastic material injection molded preform. This device has a machine bed 1, which is designed essentially U-shaped in the side view and a fixed slide part 2 is arranged on each of its right and left parts. These slide parts 2 are used for Storage of a mandrel wheel 3 provided in the center of the device, on the two disc surfaces 4 mandrels 5 parallel to the

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Dornradachse 6 and are arranged at equal distances from the same and further at equal distances from one another.

A movable slide part 7 is provided on each of the stationary slide parts 2, the slide parts 2 together form a positive guide with the slide parts 7. Each disk surface 4 of the mandrel wheel is by means of the movable slide parts 7 3 a tool carrier plate 8 can be moved to and fro relative to the stationary mandrel wheel 3 (arrow P). At every Tool carrier plate 8 is at least one injection mold 9> at least one temperature control mold 10 and at least one (in Fig. 3 (not shown) blow mold 11 is arranged. Each injection mold 9 is assigned an injection device 12, which consists of a conventional plastic plasticizing and injection unit, each of which is assigned a feed funnel 13.

As shown in FIG. 3, the two tool carrier plates are located 8 in a position in which the mandrels 5 of the mandrel wheel 3 are not surrounded by the molds 9, 10 and 11 (machine opened). In this position of the tool carrier plate 8, the step-by-step indexing of the mandrel wheel 3 is for the next one The working cycle of the device according to the invention is possible. The tool carrier plates 8 are in place during the work processes in a position in which their forms 9> 10 and 11 the mandrels 5 surrounded (machine closed), so that in the area of the injection stations, namely the injection molds 9 »preforms on the Mandrels 5 can be sprayed on, in the area of the temperature control stations, namely the temperature control molds 10, a temperature control of the in the previous work cycles injected preforms is possible, and in the area of the blow station, namely the blow molds 11, it is possible to inflate the temperature-controlled preforms onto the shape of the finished hollow body.

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To carry out the back and forth movement of the movable slide part 7 relative to the stationary mandrel wheel 3, one is used A hydraulic unit 14 consisting of a piston and a cylinder, to which a hydraulic medium is supplied via a hydraulic line 15 will. For step-by-step switching of the stationary mandrel wheel 3 between the individual work cycles during the The device according to the invention is operated by a stepping motor 16 which is fixedly arranged on the machine bed 1 and which has a pinion 17 acts on a ring gear 18 arranged on the circumference of the mandrel wheel 3 to rotate the mandrel wheel 3.

For the supply of a medium used to control the temperature of the mandrels 5, a hose line 20 is provided, which rotates in a non-rotatable manner mounted first member 21 of a distributor opens, the second member 22 is firmly connected to the mandrel wheel 3 and so it can be moved step by step with this. The distributor consists in its entirety of the first member 21 and the second Link 22. From the link 22, the medium used to control the temperature of the mandrels is only hinted at and only for one Hose line 23 shown with a single mandrel is supplied to the mandrels 5. For the supply of the temperature control medium for temperature control the tempering molds 10 is used by a further hose line 24, which is located on the back of the tool carrier plates 8 in the area the tempering molds 10 is connected. To carry out the hollow bodies necessary to inflate the preforms into finished hollow bodies Blowing air to the mandrels 5 is used by another hose line 25, which is also connected to the rear of the tool carrier plates 8 is. This hose line 25 opens into a valve nozzle 26. Corresponding to the radial distance of the valve nozzle 26 from the mandrel wheel axle 6 is provided with a valve nipple 27 on the mandrel wheel 3

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see that when the tip of the valve nozzle 26 is touched, the passage the blown air from the valve nozzle 26 through the valve nipple 27 via a further hose line 25b to the each located at a blowing station mandrel 5 allows. The valve nozzles that can be seen in FIG. 3 below the mandrel wheel axis 6 26 and valve nipple 27 are there not in the area of a blowing station, but in the area of a tempering station, namely the tempering mold 10, arranged; this serves the purpose of keeping the preform during tempering, as in accordance with the invention is intended to be able to inflate. Also the valve nozzles 26 and valve nipples shown above the mandrel wheel axis 6 in FIG. 3 27 are not in the area of a blowing station, but here in the area of the injection station; , in this area it never will a blown air supply is required, however, the illustration serves the purpose of Valve nozzles 26 and the valve nipple 27 here indicate the fact that such valve nozzles and valve nipples are basically can be attached anywhere where mandrels or molds are attached to the mandrel wheel or to a tool carrier plate can be.

Fig. 4 shows the arrangement of the various shapes 9> 10 and 11 on a tool carrier plate 8. Both the tool carrier plate 8 and the mandrel wheel 3 are designed with regard to the assignment of the forms 9 »10 and 11 or the mandrels 5 such that on one and the same tool carrier plate 8 or on one and the same mandrel wheel 3 different numbers of shapes or Thorns are attachable. For this purpose, a large number (not individually going shown) connection options are provided, of which depending on the number of spikes used and the corresponding Number of forms only a part is used. Regarding this

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shows the tool-T rager plate of Fig. 4, the connection points with the provision of three, four, six, eight or twelve thorns or a corresponding number of shapes, the numbers entered next to the connection points indicate the number of mandrels these connection points are occupied. Since at least one injection mold 9 and one blow mold 11 must be present in each case, the illustrated arrangement of the connection points can be understood in such a way that the connection provided at the apex of the pitch circle of the connections is to be understood as the connection for an injection mold, while that of the apex from counterclockwise, so see ge in the direction of arrow F, last connection of a certain number of thorns or forms as a connection for a blow mold 11 is to be understood. All connections between these two named connections and to be used with a certain number of thorns or molds represent connections for tempering molds 10. The numbers entered next to the connection points in the right half of FIG connection points located in the left part of FIG.

Fig. 5 shows a tool carrier plate 8, which the tool carrier plates 8 of Figures 3 and 4 corresponds. This tool carrier plate 8 is one for use in the device according to FIGS. 3 and 4, if in this two injection units 12 are arranged side by side. In adaptation to this, two injection molds 9 or 9 ~ are provided in the tool carrier plate 8. Two are accordingly

J. C *

Blow molds 11 and 11 are provided. Counterclockwise, that is in line of the arrow F, all-round are the ninth between the two injection molds, _9? on the one hand and the two blow molds 11 and 11_

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six tempering molds 10, 10 -, /, "^ ^

10 f and 10 / provided. The first index in each case indicates whether it is a temperature control mold 10 that is used for the injection mold. 9. Or to the injection mold 9 ₉ belongs. The index provided in the second position also indicates how many temperature control mold 10 it is that is assigned to an injection mold 9 or 9 .

1 Lt

is arranged.

Of course, when used in conjunction with the tool carrier plate shown in FIG. 5, the associated mandrel wheel 3 8 then ten correspondingly arranged connection points for mandrels 5 are provided. The angle Oc of 72 indicates that the mandrel wheel 3 is to be moved further by one step of 72 with each work cycle, so that each individual Mandrel 5 can be fed to the next work station.

From the tempering form shown in a longitudinal section in FIG. 6 10 it can be seen that this is divided into individual zones I, II, III, IV, V and VI. These zones I to VI consist of different ones Materials with different thermal coefficients, so that the one shown in this figure as uninflated on the mandrel 5 Preform 57 after appropriate inflation correspondingly different heating or cooling by the Inner wall 19 of the tempering mold 10 experiences. It is about then a direct heat transfer through mutual contact between preform 57 and inner wall 19 of the tempering mold

If the preform 57, which is located on the mandrel 5 in the interior of the tempering mold 10 of FIG. 6, is used for its tempering not inflated, there is an exchange of heat for controlling the temperature of the preform 57 by means of thermal radiation. Depending on the design

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of the individual zones I to VI on the one hand with regard to their surface smoothness, on the other hand with regard to their material from which they are made, and finally, of course, also with regard to their temperature has a different heat influence of the preform 57 through the zones I to VI instead.

7, which in turn shows a longitudinal section through a tempering mold 10, shows that this tempering mold 10 is divided into six zones VII to XII. However, these zones are made of the same materials, although they differ in terms of the Temperature control of the preform differ from one another in that they have different temperatures, which is indicated by this is that, for example, small circles 34 to be understood as heating coils are provided in different numbers and densities. These small circles 34 can, however, also be understood as circumferential channels in the tempering mold 10 through which the heating and cooling Coolant can be passed through in order to build up or maintain.

Of course, it can be used as heating coils or as channels instead of explained small circles 34, for example, induction heating of the individual zones can also be provided. Furthermore, it must be stated that the structure of a tempering mold 10 can also be such as it is achieved by combining the structure according to FIG. 6 can be achieved with the structure according to FIG.

For the sake of simplicity and clarity, no mandrel 5 and no preform 57 have been drawn in FIG. 7; in this regard attention is drawn to FIG. 6.

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For the sake of better understanding, the representation of the tempering mold 10 according to FIG. 6 has also been used to to show the inventive design of the device of Figures 3 and 4 schematically. The tempering form shown there 10 is assigned to the tool carrier plate 8 in such a way that its longitudinal axis runs parallel to the axis 6 of the mandrel wheel 3. The mandrel 5 with the preform 57 still on it is located in the corresponding position on the mandrel wheel 3.

The six tempering molds shown in Fig. 5 as being arranged on the tool carrier plate 8 differ from one another, viewed counterclockwise, in that the next tempering mold has a larger inside diameter than the previous tempering mold, that is, for example, the Temperieriorm 10 , has a smaller inside diameter than the following tempering form 10

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Claims (13)

30. JuK 1973 Godfather claims Process for the production of hollow bodies by inflating thermoplastic material by injection molding through a Injection nozzle into a preform with a mandrel made preforms, optionally by a series on top of one another coordinated measures, a temperature profile is generated over the length of the preform, thereby identifying draws that the preform after its production inside a tempering mold by heat exchange by way of Contact heat conduction and / or radiation is tempered with this. 2. The method according to claim 1, characterized in that the heat exchange seen in the longitudinal direction of the preform is carried out qualitatively and / or quantitatively differently. 3. The method according to claim 1 or 2, characterized in that the temperature control of the preform is carried out in several stages. 4. The method according to claim 3, characterized in that in individual Temperature control stages a different heat exchange is carried out. 5. The method according to at least one of the preceding claims, characterized in that the preform during the Tempe- 509807/0573 inflation and before being fed to the next processing stage is allowed to substantially shrink back to its original shape. 6. The method according to claim 5 in conjunction with at least claim 3, characterized in that the preform during successive tempering steps continuously to larger Diameter is inflated. 7. The method according to claim 5 or 6, characterized in that the preform during the tempering to complete System on the inner wall of the tempering mold (s) is inflated. 8. Device for the production of hollow bodies by inflating preforms previously produced within the device made of thermoplastic material containing an injection molding device, an injection nozzle, a preform and one in this insertable mandrel for producing the preforms and a blow mold that can be attached around the mandrel for inflating the preforms, where appropriate means for supplying or removing heat on the preform, on the preform, on the injection nozzle and coupled to one another or to one another on the mandrel in terms of their effectiveness and possibly control are coordinated that the preforms to be produced one after the other in the device and to be treated further are one of Preform to preform constant temperature profile can be given over the length of the preforms, characterized in that that tempering molds (10) are provided, within which a heat exchange by way of contact heat conduction and / or radiation can be carried out with the preform (57). 509807/0573 9- Device according to claim 8, characterized by such Formation of the tempering molds (10) that a qualitative and / or viewed in the longitudinal direction of the preform (57) quantitatively different heat exchange can be carried out with the tempering mold (10). 10. Apparatus according to claim 8 or 9 »characterized in that that the inner wall (19) of the tempering mold (10) seen in the longitudinal direction of the same in zones (VII-XII) different Temperatures is divided. 11. The device according to claim 8 or 9, characterized in that that the inner wall (19) of the tempering molds (10) seen in the longitudinal direction of the same in zones (I-VI) made of materials different heat transfer coefficient is divided. 12. Device according to any one of claims 8 to 11, characterized in that one after the other from the one on a mandrel (5) The preform (57) to be passed through the preform (10) have increasingly larger internal dimensions. 13. The device according to at least one of claims 8 to 12, characterized in that the preform (57) carrying Mandrel (5) after assignment to a tempering mold (10) on blowing means (70, 25b) for inflating the preform (57) connected. 509807/0573