CH700650B1 - Method and device for producing a container. - Google Patents

Abstract

The invention relates to a method for producing a container (49) by means of thermoplastic-plastic injection technology, wherein in an injection step an injection-molded body (41) is injected around a core of an injection mold. In this case, the core (3) defines the inner shape and a first opening of the injection-molded body (41). In the spraying step, a nozzle-side core pin (134) is guided against or into the core (3), which defines a second opening (46) during spraying. In a subsequent blowing step, the injection-molded body (41) in a blow mold is inflated to the shape of a container (49). During the blowing step, a bottom-side core pin is guided through the second opening (46) of the injection-molded body (41) towards or into the core (3).

Description

The invention relates to the field of injection molding and injection molding technology and more particularly to a method and an apparatus for producing a container and an apparatus for producing a container according to the preamble of the corresponding independent claims.

State of the art

In the injection molding technique containers are made of a molding material such as a thermoplastic material in a two-station process by a preform or preform is injected around a core or mandrel in an injection mold in an injection step from a melt, then the Core is transferred with the preform in a blow mold and there the preform is inflated into the finished shape of the container according to the blow mold. The steps "spraying" and "blowing" can be carried out in the same system, or preforms can be stored and transported before blowing.

For certain applications, it is necessary that a container not only has the one opening which forms around the core, but at least one further opening. In general, injection molding bodies have the problem that an opening in the body is enveloped by the melt and form confluence lines, which weaken the body and / or also lead to optical impairments along the flow seams.

Presentation of the invention

It is therefore an object of the invention to provide a method and an apparatus for producing a container of the type mentioned, wherein the injection-molded body has no debilitating confluence. In addition, the process should keep the cost of reworking the injection molding small and reduce waste or completely avoided.

Another object is to provide a method and an apparatus which allow to produce injection molded articles and containers formed therefrom by bladders which withstand high internal pressures and have two openings.

To achieve this object, a method and an apparatus for producing a container with the features of the corresponding independent claims.

In the method, therefore, in an injection step, the injection molded body is sprayed by the hot runner method through a nozzle in an injection mold with a cavity, wherein a core of the injection mold defines the inner shape of the injection molded body. In this case, a nozzle-side core pin is guided through the nozzle against a core of the injection mold, thereby defining an opening in the injection molded body. The melt flows, surrounding the first core pin, through an outlet opening of the nozzle extending around the first core pin into the cavity, and subsequently the outlet opening is closed.

By the nozzle-side core pin is guided against the core of the mold, creates an opening in the sprayed body. By flowing the melt around the first core pin into the cavity, it is possible to avoid weld lines. By closing the outlet opening there is no sprue or only a small sprue. This reduces material losses.

In a preferred embodiment of the invention, the nozzle has a closure means for closing and opening the outlet opening. Preferably, the closure means is the nozzle-side core pin itself and the outlet opening of the nozzle by displacement of the nozzle-side core pin in the longitudinal direction of the nozzle is obvious and closable. For this purpose, the nozzle-side core pin preferably has a constriction which is offset rearwardly relative to a front end of the nozzle-side core pin and runs around the circumference of the nozzle-side core pin.

For spraying the injection-molded body with this nozzle, the nozzle-side core pin is pushed forward, thereby driving into a recess or opening of the tool-side core pin and opens as soon as the constriction reaches the area of the nozzle tip, the outlet opening. The peripheral shape of the nozzle-side core pin is preferably exactly complementary to the inner shape of the recess, so that the melt can not penetrate into the recess of the tool-side core pin. After spraying, the nozzle-side core pin is pulled back into the nozzle, thereby separating the injection-molded body from the melt located in the nozzle and closing the nozzle.

In principle, it is also conceivable in another embodiment that the tool-side core pin is moved into the nozzle and the nozzle-side core pin pushes back into the nozzle, and a constriction on the tool-side core pin or between the core pins is present and causes the opening of the nozzle.

In a further embodiment of the invention, the closure means for closing and opening the outlet opening is arranged around the nozzle-side core pin and slidable in the longitudinal direction of the nozzle respectively of the nozzle-side core pin sleeve. If the nozzle-side core pin does not enter into an opening of the tool-side core pin, it is pressed against an outer surface or a projection of the nozzle-side core pin. By a sufficiently high pressure of the pressure between the core and the nozzle-side core pin prevents a film from the melt between the core and the nozzle-side core pin penetrates and closes the intended opening.

In both embodiments, the flow of the plastic is interruptible immediately at the annular injection point, and material losses are minimized or eliminated. As a rule, no reworking of the opening is required.

Preferably, therefore, the outlet opening forms an annular nozzle to the first core pin. The melt, when viewed along the circumference of the first core pin, forms an uninterrupted film and thereby flows as a ring film into the cavity. The injection mold is thus filled uniformly from the area of the core pin. If the plastic were injected at one or more other injection points, weakening confluence lines would result. For containers that are exposed to high loads, such as pressurized liquids or gases, such vulnerabilities can lead to destruction.

In a preferred embodiment of the invention, the injection mold in the closed state defines a substantially symmetrical with respect to a longitudinal axis shape for the injection molded body and the nozzle is arranged along this longitudinal axis. The nozzle-side core pin thus touches the core on the axis of symmetry or moves on the symmetry axis in the core or the tool-side core pin. The plastic then flows through the outlet opening and in the mold, preferably symmetrically with respect to an axis of the core, respectively the injection mold, in a direction along the axis of symmetry without the formation of weld lines.

Preferably, the injection-molded body is a preform, which is inflatable in a subsequent blowing step to a container. Preferably, then both the preform and resulting therefrom containers are substantially symmetrical to an axis of symmetry. During the blowing step, the injection-molded body is inflated to the shape of the container, wherein a second core pin is guided through the opening of the injection-molded body against the core. If a container is produced, the opening may also be referred to as a bottom opening, in contrast to an opposite main opening of the container.

A corresponding blowing station preferably has a counter-shape which is movable in the direction of the arranged in the blowing station core and the preform lying thereon. Thus, the blow mold can be closed with the counter-mold and a holding portion can be held in a bottom portion of the preform around the bottom opening by pinching between counter-mold and blow mold. Thus, the preform is sealed around the bottom opening so that it can be inflated. This also prevents distortion of the preform in the region of the bottom opening during inflation. In addition, the material receives in the bottom area when clamping its definitive shape, so that the exact shape of the container in the bottom area is defined by the shape of counter-mold and blow mold.

In a first preferred embodiment of the invention, the counter-mold is in one piece, wherein a front end of the counter-mold is formed as a bottom-side core pin whose peripheral shape is complementary to the inner peripheral shape of the recess of the tool-side core pin. An adjoining the bottom-side core pin area of the counter-mold is formed as a bottom bracket to press the holding area of the preform against the tool-side core pin and seal.

In a second preferred embodiment of the invention, the counter-mold has a bottom holder and an independent of this movable leading bottom-side core pin. Thus, when closing the blow mold, the bottom-side core pin can first be pressed against the core or the tool-side core pin, whereby the inner shape of the bottom opening is defined, and then the bottom holder can be pressed against the holding area around the opening. This embodiment is advantageous if the bottom-side core pin does not enter into an opening of the tool-side core pin, but is pressed against an outer surface or a projection of the nozzle-side core pin.

Preferably, the temperature of the blow mold in a bottom region of the preform is kept lower around the bottom opening than in a central region between the bottom opening and the main opening. This additionally stabilizes the shape in the floor area.

In the combined method for producing and inflating an injection-molded body to form a container, a preform is thus sprayed around a core in an injection step. The cavity (or cavity) of the mold is defined by moldings, such as an upper mold half, a lower mold half and a core. In this case, the core defines a first opening or main opening of the container. In a subsequent blowing step, the preform is inflated to the shape of the container. In this case, the container has a second opening or bottom opening, and at the injection step, a nozzle-side core pin is guided against the core, which defines the shape of the second opening during the spraying, and is at the blowing step, a bottom-side core pin through the second opening against led the core.

This makes it possible to produce a container with two openings in an injection-blow molding process without post-processing for the preparation of an opening, in particular also sprue-free.

The device for producing a container thus has in the injection station on a nozzle-side core pin, which is feasible against a arranged in the injection mold core and thereby defines an opening of the preform, and in the blowing station a bottom-side core pin, against a in the Blow mold arranged and carrying a preform core is feasible, wherein the bottom-side core pin passes through the opening of the preform.

Further preferred embodiments will become apparent from the dependent claims. Characteristics of the method claims are analogously combined with the device claims and vice versa.

Brief description of the drawings

In the following, the subject invention based on preferred embodiments, which are illustrated in the accompanying drawings, explained in more detail. Each show schematically: <Tb> FIG. 1 <SEP> a first variant of an injection blower; <Tb> FIG. 2 <SEP> a second variant of an injection blower; <Tb> FIG. 3 <SEP> a cross section through a spray station with open mold; <Tb> FIG. 4 <SEP> a cross-section through the closed-mold injection station; <Tb> FIG. 5 <SEP> a detail of the spray station with the nozzle open; <Tb> FIG. FIG. 6 shows a cross-section through a blowing station with the mold open; FIG. <Tb> FIG. 7 <SEP> a cross section through the blow mold with closed mold; and <Tb> FIG. 8 <SEP> a cross section through the blowing station after blowing; <Tb> FIG. 9 <SEP> a cross section through a container; <Tb> FIG. FIG. 10 shows a cross section through a spraying station in a further embodiment of the invention; FIG. and <Tb> FIG. 11 shows a cross section through a blowing station in a further embodiment of the invention.

The reference numerals used in the drawings and their meaning are summarized in the list of reference numerals. Basically, the same parts are provided with the same reference numerals in the figures.

Ways to carry out the invention

The following preferred embodiments show the production of an injection molded body as a preform in a spray-blow process. However, the injection step shown is also independent of a subsequent blowing step for differently shaped injection molded body, which are not intended for use as preforms, executable. Even with the execution of the injection-blow molding process preforms can be sprayed and inflated in separate systems, and transported and stored in between.

1 shows a first variant of an injection blower in a so-called 4-station technology, comprising a spray station 1, a blowing station 2, a stripping station 5 and a conditioning station 6. On a transport device 7 mandrel or core holder 71 are arranged, which cores 3 hold, around which in the spray station 1 preforms 41 are injected. In the blowing station 2, the preforms 41 are inflated to containers 49, and stripped in the stripping station 5 of the cores 3 and supplied for further processing. In the optional conditioning station 6, for example, the cores 3 can be brought to a predetermined temperature in preparation for the injection process. In each of the stations are one, two or more cores 3. The transport device 7 moves between the processing steps, the cores 3 each to the next station. In other embodiments of the invention, no conditioning station 6 is present. In principle, the invention can also be implemented without a special stripping station, ie only with the spray station 1 and the blowing station 2.

In an alternative embodiment (not shown), the conditioning station 6 is arranged between injection station 1 and blowing station 2. Thus, the temperature of the preforms 41 can be specifically prepared for the blowing step, for example by heating the sections still to be deformed and by cooling neck or threaded areas.

Fig. 2 shows a second variant of a spray blower as common 3-station technology with the spray station 1, the blowing station 2 and the stripping station 5 and without a conditioning station. 6

Fig. 3 shows a cross section through a spray station 1 with open mold 11. The mold 11 has an upper mold half 11a and a lower mold half 11b, which are movable relative to each other for opening the mold 11. The two mold halves 11a, 11b have cooling channels 12. These are preferably flowed through by separately controlled and tempered media, so that can be set in different areas of the mold different temperatures.

Between the two mold halves 11a, 11b, a core 3 is arranged. The core 3 is held by a shaft 33 and has a core front part 31 and a tool-side core pin 32 extending through the core front part 31. The core front part 31 defines a part of the shape of the cavity 14 and thus of the injection molded body, in particular a preform 41. The core front part 31 is preferably displaceable for opening air inlets for blowing with respect to the shaft 33 and the tool-side core pin 32. The tool-side core pin 32 is rigidly arranged with respect to the shaft 33. At the outer or front (facing away from the shaft 33) end of the core 3, this, respectively, the tool-side core pin 32, a recess 322 on. This recess 322 preferably has a rotationally cylindrical shape or another cylindrical shape.

A nozzle 13 for injecting a flowable plastic as a melt preferably has a nozzle shell 131 with a heater 137. In the interior of the nozzle 13 extends, movable in the axial direction, a nozzle-side core pin 134. Between the nozzle-side core pin 134 and the nozzle shell 131 is a cavity which serves as a channel 133 for the molding material. Between a nozzle tip 135 of the nozzle 13 and the end of the nozzle-side core pin 134, the channel 133 narrows to an annular, closable outlet opening 136. In FIG. 3, the nozzle-side core pin 134 closes the outlet opening 136 with its front end.

Fig. 4 shows a cross section through the injection station 1 with closed mold 11. With reference to Fig. 3, the core 3 and the upper mold half 11a are moved downwards against the lower mold half 11b. The nozzle-side core pin 134 has, with respect to its front end offset to the rear, a circumferential constriction, ie an area with a smaller cross-section.

When the injection mold 11 is closed, the nozzle-side core pin 134 is guided against the core 3 and then guided into the core 3, more specifically into the recess 322. For this purpose, the nozzle-side core pin 134 has a peripheral shape which corresponds to the shape of Recess 322 corresponds, so for example, also a cylindrical, in particular rotationally cylindrical shape. Thus, the nozzle-side core pin 134 and the recess 322 form a positive connection, which prevents the melt from entering the recess 322. In the figures, the front end of the nozzle-side core pin 134 is drawn flat, but it is also a more or less conical or chamfered shape possible. In this case, in the closed position of the nozzle 13, the nozzle-side core pin 134 still projects out of the nozzle 13. Accordingly, when closing the injection mold 11, either the nozzle 13 as a whole can be moved against the core 3 or vice versa.

After the nozzle-side core pin 134 has traveled a predetermined distance, the constriction enters the region of the nozzle tip 135 and thereby opens the nozzle 13. Now, the melt can be pressed into the cavity 14.

Fig. 5 shows the opened nozzle 13, the filled cavity 14 and the injection molded body respectively formed preform 41. The channel 133 is, as in the other figures, filled with melt, but the melt is not shown. After at least partial cooling of the preform 41, the nozzle-side core pin 134 is retracted into the nozzle 13 and closes the outlet opening 136 again. The injection mold 11 can be opened. The injection-molded body 41 can be removed and stored temporarily, or, as shown subsequently, left on the core 3 and brought into the blowing station 2.

Fig. 6 shows a cross section through a blowing station 2 with an open blow mold 21. The blow mold 21 has an upper blow mold half 21a and a lower blow mold half 21b, each with cooling channels 22, on. On the core 3, the preform 41 is shown after the injection step. In the area of the tool-side core pin 32, the preform 41 has a second opening or bottom opening 46.

The blowing station 2 has a counter-mold 34. With the blow mold 21 closed and the core 3 positioned therein (FIG. 7), it can be moved against the core 3 or the preform 41 into a blow position (or vice versa). The counter-mold 34 has a bottom-side core pin 341 which can be guided through the bottom opening 46 against the core 3, in particular the tool-side core pin 32, and into the recess 322. The bottom-side core pin 341 is formed with its peripheral shape corresponding respectively complementary to the shape of the recess 322. A bottom holder 342, like the bottom-side core pin 341, is integrally formed on the counter-mold 34 in this embodiment of the invention.

During the movement of the counter-mold 34 against the tool-side core pin 32 first moves the bottom-side core pin 341 in the recess 322 and closes it. Subsequently, the bottom holder 342 presses the preform 41 in the holding area 47 against the tool-side core pin 32 (blowing position). The bottom holder 342 thus closes the blow mold 21 in the region of the end of the core 3 and forms the mold for the region around the bottom opening 46. The core front part 31 remains movable with respect to the tool-side core pin 32 and can be displaced to open air feed openings for inflating the preform 41 become. The air supply (not shown) can take place from the shaft 33 or from the counter-mold 34.

Fig. 8 shows a cross section through the blowing station 2 with the counter-mold 34 in blow position and with the generated container 49 after blowing.

Fig. 9 shows a cross section through a container 49 thus formed. This is preferably substantially rotationally symmetrical and has a neck portion 42 with a first opening or main opening 43 which has been formed around the core 3. In the neck region 42 is typically a flange 44 or a thread. At the opposite end there is a bottom region 45 with the second opening or bottom opening 46. In between there is a central region 48, the shape of which is created primarily in the blowing step.

The entire process for producing a container 49 proceeds as follows: In the injection station 1, the upper injection mold half 11a and the lower injection mold half 11b are closed around the core 3. The core front part 31 and the injection mold 11 define the shape of the preform 41. <tb> • <SEP> The nozzle-side core pin 134 is moved against the core 3 or the tool-side core pin 32, and enters the recess 322. The nozzle-side core pin 134 defines the inner shape of the future bottom opening 46. First, the annular exit opening 136 of the nozzle 13 is closed, but opens as soon as the constriction 138 reaches the area of the nozzle tip 135. <tb> • <SEP> The melt is passed through the outlet opening 136 into the cavity 14 or pressed. The cavity 14 defines the shape of the preform 41. <tb> • <SEP> The nozzle-side core pin 134 is retracted again and thus the outlet opening 136 is closed. In the cavity 14, the preform 41 has been formed. After a cooling time, in which especially the neck region 42 and the bottom region 45 of the preform 41 are cooled compared to the middle region 48 and thus become harder than the central region 48, the injection mold 11 is opened. The core 3 carries the newly formed preform 41. The core 3 with the preform 41 is optionally conditioned and moved to the blowing station 2. The upper blow mold half 21a and the lower blow mold half 21b are closed around the core 3 with the preform 41. Preferably, the blow mold 21 corresponds to the shape of the neck region 42 and in particular a flange 44 and / or a thread in the neck region 42, so that the preform 41 is held on blowing. <tb> • <SEP> The counter-mold 34 is guided against the blow mold 21. In this case, the bottom-side core pin 341 moves into the recess 322 of the core respectively of the tool-side core pin 32. Subsequently, the bottom holder 342 is pressed against the bottom portion 45 of the preform 41 and holds it in an annular, around the bottom opening 46 extending holding portion 47, fixed. Bottom-side core pin 341 and core 3 adjoin each other and define the inner shape of bottom opening 46. The preform 41 is inflated against the blow mold 21, preferably only the center region 48 deforms, and takes the form of a container 49. <tb> • <SEP> After a cooling time, the counter-mold 34 is withdrawn and the blow mold 21 is opened. After optional further conditioning, the finished container 49 is withdrawn from the core 3 through the main opening 43.

Fig. 10 shows a cross section through a spray station 1 in a further embodiment of the invention: The tool-side core pin 32 has, instead of the recess, a flat surface or an axially projecting projection 321, wherein an opening of the preform 41 is formed becomes. Due to the rigid support of the tool-side core pin 32 on the shaft 33, it is possible to press the nozzle-side core pin 134 with high pressure against the tool-side core pin 32, in particular against the projection 321, to prevent the melt forms a film therebetween. However, the core front portion 31 remains movable with respect to the shaft 33 and the tool-side core pin 32, so that the core front portion 31 is slidable in the blowing step for opening an air supply for inflating the injection molded body 41.

The nozzle 13 for injecting a flowable plastic as a melt also has a nozzle shell 131 with a heater 137 here. In the interior of the nozzle 13, movable in the axial direction, a nozzle-side core pin 134. Around the nozzle-side core pin 134 around a hollow cylindrical sleeve 132 is additionally arranged, which is movable relative to the nozzle-side core pin 134 and the nozzle shell 131 in the axial direction. Between the sleeve 132 and the nozzle shell 131 is a cavity which serves as a channel 133 for the molding material. Between a nozzle tip 135 of the nozzle 13 and the end of the nozzle-side core pin 134, the channel 133 narrows to an annular outlet opening 136. If the sleeve 132 pushed against the outlet opening 136 (not shown), it closes the outlet opening 136th

For spraying, after the positioning of the core 3 and the closing of the mold 11, the nozzle-side core pin 134 is moved to the right against the core 3, so that the nozzle-side core pin 134 abuts against the tool-side core pin 32. To increase the surface pressure between the end of the nozzle-side core pin 134 and the tool-side core pin 32, an inner part of the end surface of the nozzle-side core pin 134 and / or the tool-side core pin 32 may be curved inward, so that the nozzle-side core pin 134 and the tool-side core pin 32 only in touch a peripheral region of the contact surface and so this area is better sealed. When the injection mold 11 is closed, the nozzle 13 can be opened. This is done by retracting the sleeve 132 as shown in FIG. In this state, mold material (not shown) may flow through the channel 133 into the cavity 14 of the mold 11 to form a preform 41.

Fig. 11 shows a cross section through a blowing station 2 in a further embodiment of the invention. Again, there is a counter-mold 34, which is movable with positioned core 3 and closed blow mold 21 against the core 3 and the preform 41 in a blow position. The counter-mold 34 additionally has a separately movable bottom-side core pin 341 which can be guided through the bottom opening 46 against the core 3, in particular against the tool-side core pin 32. A bottom holder 342 of the counter-mold 34, movable separately from the bottom-side core pin 341, can be guided in the direction of the core 3 against the preform 41. The bottom-side core pin 341 and the bottom holder 342 and thus both in the axial direction relative to each other and relative to the mold 11 movable, preferably along an axis coaxial with the axis of the core 3. In the movement of the counter-mold 34 against the tool-side core pin 32 first encounters the bottom core pin 341 against this. Thereby, the shape of the bottom opening 46 is defined before the bottom holder 342 compresses the preform 41 in the holding area 47. The bottom holder 342 then closes the blow mold 21 in the region of the end of the core 3 and forms the shape for the area around the bottom opening 46.

The embodiments of FIGS. 10 and 11 are preferably realized together in an injection blower.

LIST OF REFERENCE NUMBERS

[0049] <Tb> 1 <September> injection station <Tb> 11 <September> injection mold <tb> 11a <SEP> upper mold half <tb> 11b <SEP> lower mold half <tb> 12 <SEP> Cooling channels of the injection mold <Tb> 13 <September> nozzle <Tb> 131 <September> nozzle casing <Tb> 132 <September> Barrel <Tb> 133 <September> Channel <tb> 134 <SEP> Nozzle-side core pin <Tb> 135 <September> nozzle tip <Tb> 136 <September> outlet opening <Tb> 137 <September> Heating <tb> 14 <SEP> Mold cavity <Tb> 2 <September> blow station <Tb> 21 <September> blow <tb> 21a <SEP> upper blow mold half <tb> 21b <SEP> lower blow mold half <tb> 22 <SEP> Cooling channels of the blow mold <Tb> 3 <September> Core <Tb> 31 <September> core front part <tb> 32 <SEP> tool-side core pin <Tb> 321 <September> Lead <Tb> 322 <September> Recording <Tb> 33 <September> End <Tb> 34 <September> counter mold <tb> 341 <SEP> bottom-side core pin <Tb> 342 <September> floorstands <Tb> 41 <September> preform <Tb> 42 <September> neck <Tb> 43 <September> main opening <Tb> 44 <September> flange <Tb> 45 <September> base area <Tb> 46 <September> bottom opening <Tb> 47 <September> holding area <Tb> 48 <September> mid-range <Tb> 49 <September> container <Tb> 5 <September> stripping station <Tb> 6 <September> conditioning station <Tb> 7 <September> transport device <Tb> 71 <September> core holder

Claims (10)

1. A method for producing a container (49) by means of thermoplastic-plastic injection technique from a flowable melt, wherein in an injection step, an injection molded body (41) by the hot runner method by a nozzle (13) in an injection mold (11) having a cavity (14 ) and is injected around a core (3) of the injection mold (11), wherein the core (3) defines the internal shape and a first opening of the injection molded body (41), characterized in that during the spraying step, a nozzle-side core pin (134) is guided through the nozzle (13) towards or into the core (3) defining a second opening (46) in the injection molding body (41), and the melt is the nozzle side Core pin (134) surrounding by an outlet opening (136) of the nozzle (13) extending around the nozzle-side core pin (134) flows into the cavity (14) and then the outlet opening (136) is closed, and in a subsequent blowing step, the injection-molded body (41) in a blow mold is inflated to the shape of a container (49) and the blowing step, a bottom-side core pin (341) through the second opening (46) of the injection molding (41) against or into the Core (3) is guided. 2. The method according to claim 1, wherein the outlet opening (136) forms an annular nozzle around the nozzle-side core pin (134). 3. The method according to claim 1 or 2, wherein in the blowing step by means of a counter-mold (34) around a second opening (46) around lying holding portion (47) of the injection molded body (41) against the core (3) is pressed, wherein the Counter-mold (34) is a separate from the blow mold (21) movable element. 4. An apparatus for producing a container (49) by means of thermoplastic plastic injection technology, comprising a spray station (1) with at least one injection mold (11) and a nozzle (13) for spraying an injection molded body (41) according to the hot runner method in a cavity (14). and around a core (3) of the injection mold (11), wherein the core (3) defines the inner shape and a first opening of the injection molded body (41), and a blow station (2) having at least one blow mold (21) and the core (3) which can be arranged in the blow mold (21) for inflating the injection molded body (41) to form a container (49) in the blow mold (21), characterized in that the injection station (1) has a nozzle-side core pin (134), which by the nozzle (13) against or in the mold (11) arranged core (3) can be guided, wherein the nozzle (13) to a having the nozzle-side core pin (134) extending around the outlet opening (136), and the outlet opening (136) is closable, and the core (3) is designed to carry the injection-molded body (41) and to inject air into the injection-molded body (41), and the core (3) used in the injection station (1) with a sprayed injection molded body (41) for blowing in the blowing station (2) is movable, and the blowing station (2) has a bottom-side core pin (341) which is arranged through a second opening (46) of an injection-molded body (41) arranged on the core (3) towards or into the blow-mold (21) and the injection-molded body (41). carrying core (3) is feasible and thus defines an inner shape of the second opening (46) after blowing. 5. The device according to claim 4, wherein the outlet opening (136) forms an annular nozzle around the nozzle-side core pin (134). 6. Device according to one of claims 4 to 5, wherein the outlet opening (136) of the nozzle (13) by moving the nozzle-side core pin (134) in the longitudinal direction of the nozzle (13) is apparent and closable. 7. Device according to one of claims 4 to 6, wherein the bottom-side core pin (341) is part of a counter-mold (34), Wherein the counter-mold (34) is a part which is movable separately from the blow mold (21) and together with the blow mold (21) defines a shape of a container (49) after being inflated, And the counter-mold (34) has a bottom holder (342), which in the direction of the core (3) arranged in the blowing station (2) for holding the injection-molded body (41) arranged in the blow mold (21) in one around the second opening ( 46) lying around holding area (47) of the injection molded body (41) is movable. 8. The device according to claim 7, wherein the bottom-side core pin (341) and the bottom holder (342) are rigidly connected together and moved together, and preferably integrally formed on the counter-mold (34). 9. Device according to one of claims 4 to 8, wherein The core (3) is arranged on a shaft (33), has a core front part (31) and a tool-side core pin (32) extending through the core front part (31), and The core front part (31) defines part of the shape of the cavity (14) and thus of the injection-molded body (41), The core front part (31) is displaceable with respect to the shaft (33) and the tool-side core pin (32), • the nozzle-side core pin (134) of the injection station (1) against or in the tool-side core pin (32) is feasible, and • the bottom-side core pin (341) of the blowing station (2) against or in the tool-side core pin (32) is feasible. 10. The device according to claim 9, wherein the core front part (31) with respect to the shaft (33) and the tool-side core pin (32) for opening an air supply for inflating the injection-molded body (41) is displaceable.