DE102007037536A1 - Process for producing tube-like bodies and a tube-like body - Google Patents

Abstract

The method is used to produce tube-like bodies. A thermoplastic injection molded preform is thermoformed into a container by biaxial expansion in a blow mold. The forming takes place by a stretching process and by supplying a pressurized blown gas. The container is removed as an intermediate of the blow mold and a bottom portion of the container is cut off. In a final production step, a compression of the cut edge and welding takes place. The container as an intermediate product is formed with a design that deviates at least in regions from a cylindrical base contour in a side wall region between a mouth section and a bottom opposite the mouth section.

Description

The The invention relates to a method for producing a tube-like Body.

The Invention relates to this a tube-like body, as a separated part of a blow-molded and biaxially oriented container is formed of a thermoplastic material.

such tube-like body can for example as a tube according to common usage be formed, the one with a thread or bounce cams or Undercuts provided mouth section has, on which a rotary closure is placed. outgoing from the threaded mouth section has such a tube on a shoulder portion, the mouth portion of a Cross-sectional extension in a main part of the body passes. In the area of the mouth portion remote part of such a tube is closed.

Usual production methods for the production of such tubes, for example, the production of pipe section shaped Preforms of a film material, which then with an injection molding technique produced mouth section is welded with molded shoulder. Also exist so-called deep-drawing process, in which the tube-like body made by injection molding produced preforms are produced.

In the WO 97/40972 the production of a tube-like body is described, in which first a container-like body is blow-molded and then a bottom portion of this container is cut.

to Blastechnischen production of containers from previously injection-molded Preforms are already known different methods and devices.

It This is a preform after a thermal conditioning stretched in a blow mold by a stretch rod and through Blowing pressure in the container is transformed. The stretch rods are frequently used by pneumatic cylinders or over Curve controls positioned.

In a container molding by blowing pressure preforms of a thermoplastic material, such as preforms made of PET (polyethylene terephthalate), supplied to different processing stations within a blow molding machine. Typically, a blow molding machine of the type has a heating device and a blowing device, in the region of which the previously tempered preform is expanded by biaxial orientation to form a container. The expansion takes place with the aid of compressed air, which is introduced into the preform to be expanded. The procedural sequence in such an expansion of the preform is in the DE-OS 43 40 291 explained. The introductory mentioned introduction of the pressurized gas also includes the introduction of compressed gas into the developing container bubble and the introduction of compressed gas into the preform at the beginning of the blowing process.

The basic structure of a blowing station for container molding is in the DE-OS 42 12 583 described. Possibilities for tempering the preforms are in the DE-OS 23 52 926 explained.

Within the blow molding apparatus, the preforms and the blown containers transported by means of different handling devices become. proven In particular, the use of transport thorns, to which the preforms are attached. But the preforms can be handled with other support devices. The usage grippers for handling preforms and use of expanding mandrels for mounting in a mouth region of the preform insertable are, belong also available Constructions.

The already explained Handling of the preforms takes place on the one hand in the so-called two-stage process, where the preforms initially in an injection molding process produced, then stored and later conditioned in temperature and inflated to a container become. On the other hand, an application in the so-called one-step process, in which the preforms immediately after their injection molding Manufacture and sufficient solidification suitable tempered and subsequently be inflated.

in the With regard to the blowing stations used are different embodiments known. At blow stations, which are arranged on rotating transport wheels are, a book-like Aufklappbarkeit the mold carriers are frequently encountered. But it is also possible to use relatively displaceable or differently guided mold carriers. at fixed blow molding stations, which are particularly suitable for multiple cavities for container molding are typically arranged parallel to each other Plates as mold carriers used.

The previously known methods for the production of tube-like bodies are not yet in reaching way suitable to meet all requirements for an application-oriented optimal design of the tube-shaped body.

task It is the object of the present invention to provide a method of the mentioned type to improve such that increased design options be provided in the specification of the shape of the tube-shaped body.

• a) Spritzgußtechnische Herstellung eines Vorformlings aus einem thermoplastischen Material,
• b) Einsetzen des Vorformlings in eine Blasform,
• c) biaxiales Expandieren des Vorformlings zu einem Behälter durch Recken und Zuführung eines unter Druck stehenden Blasgases,
• d) Formung des Behälters mit einer Gestaltung, die in einem Seitenwandbereich zwischen einem Mündungsabschnitt und einem dem Mündungsabschnitt gegenüberliegenden Boden mindestens bereichsweise von einer zylindrischen Grundkontur abweicht,
• e) Entnahme des Behälters aus der Blasform,
• f) Abschneiden des Bodens des Behälters entlang eines Schnittrandes,
• g) Verschließen des dem Mündungsabschnitt gegenüberliegenden Endbereiches.

This object is achieved in that the following steps are carried out sequentially:

• a) injection molding of a preform made of a thermoplastic material,
• b) inserting the preform into a blow mold,
• c) biaxially expanding the preform to a container by stretching and supplying a pressurized blast gas,
• d) shaping of the container with a design which deviates at least regionally from a cylindrical basic contour in a side wall region between a mouth section and a bottom opposite the mouth section,
• e) removal of the container from the blow mold,
• f) cutting off the bottom of the container along a cutting edge,
• g) closing the end portion opposite the mouth portion.

When Blasgas can be used in particular blown air.

Further Object of the present invention is to provide a tube-like body of initially mentioned type in such a way that diverse shape designs are supported.

These Task is inventively characterized solved, the existence Sidewall area of the body, which is between a mouth section and one the mouth section opposite arranged closed end portion of the body extends, at least before closing of the end portion at least one of a cylindrical base contour has different design.

Under a cylindrical basic contour is in this case both an exactly cylindrical Form as well as a shaping understood by squeezing a cylindrical Output contour is created. In known tubes is a compression and weld together of the mouth section opposite Endbereiches, so that the actual Shape of the tube starting from a cylindrical design in the Near the mouth section increasingly flatter towards the closed end region and at the same time becoming wider. A cross-sectional area of the tube changes thereby continuously starting from the mouth section in the direction on the end portion of a circular shape over oval-like shapes to a final contour composed of rounded sections. Also the before the execution the welding process compressed However, areas of the tubes have an original cylindrical basic contour on.

deviant from the known methods, in which before closing the Endbereiches a cylinder-like tube blank is produced, According to the invention, a tube blank manufactured, the at least partially one of the cylindrical Basic contour has different design. This manufacturing step and the corresponding tube design create considerable freedom the design specification for the finished tube.

One An essential feature of the process is the complete separation of the floor area of the container watching. The floor area includes not necessarily only the actual area of the container bottom, but possibly also a part of itself between this Bottom and the mouth section extending sidewall area. The specific localization of the Section plane can be application-dependent respectively. In particular, it is not absolutely necessary the existence Separating is performed perpendicular to a centerline of the container, but it can here application-dependent aslant are given to the center line extending parting planes. Also is not necessarily the production of a smooth cutting edge specified but in dependence From the cutting tool used, the contour of the edge of the respective production requirements or the respective product design optimized adapted become. For example, it is possible the contour wavy to design what a freshness or cold effect is suggested.

Height Production rates are particularly supported by the fact that the production of the container carried out in a two-stage process.

to Introduction of sufficiently large stretching forces suggested that the Stretching is performed using a stretch rod.

Low cost production is assisted by making the container from a preform having a monolayer construction. In particular, it is also possible to use a multilayer structure. In a multilayer structure, for example, a layer may be formed as a barrier layer to prevent passage of Ga prevent and reduce these risks. It is also possible in the packaging of certain products, to provide an inner layer with properties that avoids or reduces adhesion of the product.

One typical production process is carried out such that a container bottle-shaped container will be produced.

According to one preferred application is provided that as a tube-like body a Tube is made.

According to one Production variant is thought that the welding of the Cutting edge before filling of the tube-shaped Container is performed.

According to one Other production methods, it is also possible that the welding of the cutting edge after a filling of the tube-shaped container carried out becomes.

A favorable Material distribution can be achieved that in the Blow molding of the container a Blasgaszufuhr only after completion of the stretching process carried out becomes.

Also wear it to an advantageous material distribution in that the blowing pressure with a slow pressure increase of at most 100 bar / second is supplied.

One sufficiently slow blow pressure increase can be achieved thereby that the Blowing pressure is supplied with the interposition of a throttle.

A further advantageous influencing of the material distribution takes place in that the Stretching process with a stretch ratio from at most 2.0 to 2.5 based on the length of the container performed relative to the preform becomes.

at the implementation a so-called preferential heating for the production of bottles with oval-like or similar Cross-sectional contour, it proves to be advantageous that in the Carrying out a in the circumferential direction uneven temperature of the preform of the preform simultaneously of two each other opposite Radiant heaters is heated.

A deliberately uneven material distribution in the wall of the tube-like container can be achieved be that the Preforms on opposite sides Sides heated unevenly become.

A very accurate temperature control in the wall of the preform can be achieved in that the preforms during the execution their heating are kept by a transport element that coupled with a mechanical position control, the rotational movements of the preform gradually pretends.

To a uniform basic temperature helps, that the Preform during the implementation a basic temperature control with a speed of at least two revolutions per second about its longitudinal axis rotates.

In The drawings are exemplary embodiments of the invention shown schematically. Show it:

1 A perspective view of a blowing station for the production of containers from preforms,

2 a longitudinal section through a blow mold, in which a preform is stretched and expanded,

3 a sketch to illustrate a basic structure of a device for blow molding containers,

4 a modified heating section with increased heating capacity,

5 a side view of a container with a separate floor area,

6 a schematic representation of a production plant for the production and filling of tube-like bodies,

7 a tube with undercut in the sidewall area,

8th a representation for illustrating a surface structure in the region of the tube-shaped container and

9 a perspective view of a container with a truncated pyramid-like closure cap and relative to a longitudinal axis twisted course of the side walls.

Before explaining the detailed production steps for producing the tube-shaped body, the blow-molding method and the blow-molding device for shaping injection-molded preforms ( 1 ) into the intermediate containers ( 2 ).

The basic structure of a device for Forming of preforms ( 1 ) in containers ( 2 ) is in 1 and in 2 shown.

The device for forming the container ( 2 ) consists essentially of a blowing station ( 3 ), which are blown ( 4 ) into which a preform ( 1 ) can be used. The preform ( 1 ) may be an injection-molded part of polyethylene terephthalate. It is also intended to use the preform ( 1 ) form polypropylene. Also, the use of polyethylene or polyamide or mixtures of the above materials is possible.

To enable insertion of the preform ( 1 ) in the blow mold ( 4 ) and to allow removal of the finished container ( 2 ) the blow mold ( 4 ) from mold halves ( 5 . 6 ) and a bottom part ( 7 ), which by a lifting device ( 8th ) is positionable. The preform ( 1 ) in the area of the blowing station ( 3 ) of a transport mandrel ( 9 ), which together with the preform ( 1 ) passes through a plurality of treatment stations within the device. But it is also possible to use the preform ( 1 ), for example via pliers or other handling means directly into the blow mold ( 4 ).

To enable a compressed air supply line is below the transport mandrel ( 9 ) a connecting piston ( 10 ) disposed of the preform ( 1 ) Supplies compressed air and at the same time a seal relative to the transport mandrel ( 9 ). In a modified construction, it is basically also conceivable to use solid compressed air supply lines.

A stretching of the preform ( 1 ) takes place in this embodiment by means of a stretch rod ( 11 ), by a cylinder ( 12 ) is positioned. According to another embodiment, a mechanical positioning of the stretch rod ( 11 ) carried out over curve segments which are acted upon by Abgriff. The use of curve segments is particularly useful when a plurality of blow molding stations ( 3 ) are arranged on a rotating blowing wheel.

At the in 1 illustrated embodiment, the stretching system is designed such that a tandem arrangement of two cylinders ( 12 ). From a primary cylinder ( 13 ), the stretch rod ( 11 ) first before the beginning of the actual stretching process into the area of a soil ( 14 ) of the preform ( 1 ) hazards. During the actual stretching process, the primary cylinder ( 13 ) with extended stretch rod together with a primary cylinder ( 13 ) carrying carriages ( 15 ) from a secondary cylinder ( 16 ) or via a cam control. In particular, the secondary cylinder ( 16 ) such a cam-controlled use that of a leadership role ( 17 ), which slides along a curved path during the execution of the stretching process, a current stretching position is specified. The leadership role ( 17 ) is from the secondary cylinder ( 16 ) pressed against the guideway. The sled ( 15 ) slides along two guide elements ( 18 ).

After closing in the range of girders ( 19 . 20 ) arranged mold halves ( 5 . 6 ) there is a locking of the carrier ( 19 . 20 ) relative to each other by means of a locking device ( 40 ).

For adaptation to different shapes of a mouth section ( 21 ) of the preform ( 1 ) is according to 2 the use of separate thread inserts ( 22 ) in the area of the blow mold ( 4 ) intended.

2 shows in addition to the blown container ( 2 ) also shown in dashed lines the preform ( 1 ) and schematically a developing container bubble ( 23 ).

3 shows the basic structure of a blow molding machine with a heating line ( 24 ) and a rotating blowing wheel ( 25 ) is provided. Starting from a preform input ( 26 ), the preforms ( 1 ) of transfer wheels ( 27 . 28 . 29 ) in the area of the heating section ( 24 ). Along the heating route ( 24 ) are radiant heaters ( 30 ) as well as blowers ( 31 ) arranged to the preforms ( 1 ) to temper. After a sufficient temperature of the preforms ( 1 ) these are to the blowing wheel ( 25 ), in whose area the blowing stations ( 3 ) are arranged. The finished blown containers ( 2 ) are provided by further transfer wheels of a delivery line ( 32 ).

To get a preform ( 1 ) into a container ( 2 ) that the container ( 2 ) Has material properties which have a long useful life from inside the container ( 2 ), for example, of foods, in particular of beverages or of cosmetic products, special process steps in the heating and orientation of the preforms ( 1 ) be respected. In addition, advantageous effects can be achieved by adhering to special dimensioning regulations. The use of the tubes according to the invention also makes it possible, for example, to package medical, cosmetic, pharmaceutical and chemical contents, in particular also adhesives.

When thermoplastic material can different plastics are used. Can be used for example PET, PEN, PA or PP.

The The present invention also relates in particular to the novel Use of tubes for packaging the above or below mentioned Products. The combination of tubes and / or packaging corresponding to the method according to the invention are made with one or more of the listed packaging products thus represents an independent inventive idea.

The expansion of the preform ( 1 ) during the orientation process is carried out by compressed air supply. The compressed air supply is in a Vorblasphase in which gas, for example, compressed air, is supplied at a low pressure level and divided into a subsequent Hauptblasphase in which gas is supplied at a higher pressure level. During the pre-blowing phase, compressed air is typically used at a pressure in the interval of 10 bar to 25 bar and during the main blowing phase compressed air is supplied at a pressure in the interval of 25 bar to 40 bar.

Out 3 is also apparent that in the illustrated embodiment, the heating section ( 24 ) from a plurality of circulating transport elements ( 33 ) is formed, the chain-like strung together and along deflection wheels ( 34 ) are guided. In particular, it is envisaged to open a substantially rectangular basic contour by the chain-like arrangement. In the illustrated embodiment, in the region of the transfer wheel ( 29 ) and an input wheel ( 35 ) facing the extent of the heating section ( 24 ) a single relatively large-sized deflection ( 34 ) and in the region of adjacent deflections two comparatively smaller dimensioned deflection wheels ( 36 ) used. In principle, however, any other guides are conceivable.

To enable a dense arrangement of the transfer wheel ( 29 ) and the input wheel ( 35 ) relative to each other, the arrangement shown to be particularly useful, since in the region of the corresponding extent of the heating section ( 24 ) three deflection wheels ( 34 . 36 ), in each case the smaller deflection wheels ( 36 ) in the area of the transition to the linear curves of the heating section ( 24 ) and the larger deflection wheel ( 34 ) in the immediate transfer area to the transfer wheel ( 29 ) and to the input wheel ( 35 ). Alternatively to the use of chain-like transport elements ( 33 For example, it is also possible to use a rotating heating wheel.

After a finished blowing of the container ( 2 ), these are picked up by a picking wheel ( 37 ) from the field of blowing stations ( 3 ) and via the transfer wheel ( 28 ) and an output wheel ( 38 ) to the output section ( 32 ).

In the in 4 illustrated modified heating section ( 24 ) can by the larger number of radiant heaters ( 30 ) a larger amount of preforms ( 1 ) are tempered per unit time. The blowers ( 31 ) direct cooling air into the area of cooling air ducts ( 39 ), which the associated radiant heaters ( 30 ) in each case opposite and deliver the cooling air via outflow openings. Due to the arrangement of the outflow directions is a flow direction for the cooling air substantially transverse to a transport direction of the preforms ( 1 ) realized. The cooling air channels ( 39 ) in the area of the radiant heaters ( 30 ) opposite surfaces provide reflectors for the heating radiation, it is also possible on the discharged cooling air and a cooling of the radiant heater ( 30 ) to realize.

Now that the production steps for the production of the intermediate container ( 2 ) are explained with reference to 5 the explanation of the production of the further production steps. For producing a tube-shaped container ( 41 ) is removed from the container ( 2 ) a floor area ( 42 ) separated. This can be done mechanically or using other suitable separation methods. The floor area ( 42 ) is from the tube-shaped container ( 41 ) and may be supplied for further use, for example material recycling.

In 6 a production plant is shown in which all production steps are carried out locally summarized. Granular starting material ( 43 ) is an injection molding device ( 44 ) and here to the preforms ( 1 ) transformed. The preforms ( 1 ) are a blowing device ( 45 ) and there in the container ( 2 ) transformed. The containers ( 2 ) are then a cutting device ( 46 ), which cover the floor areas ( 42 ) from the remaining area of the containers ( 2 ) and thereby separating the tube-shaped containers ( 41 ). The tube-shaped containers ( 41 ) are used in a further production step of a filling device ( 47 ), which feeds a product into the tube-shaped container ( 41 ).

In such a method, the mouth section ( 21 ) of the tube-shaped container ( 41 ) closed in advance. This can be done for example by screwing or bouncing a lid and / or applying a muzzle seal. The filling process is thus through the open the mouth section ( 21 ) opposite region of the tube-shaped container ( 41 ), which was previously determined by cutting off the ground area ( 42 ) was generated.

In a final production step, the filled tube-shaped container ( 41 ) one Welding device ( 48 ) supplied to the still open the mouth section ( 21 ) opposite region of the tube-shaped container ( 41 ) in the region of a cut edge ( 49 ) closes.

Deviating from the production concept in 6 Different variants can be realized. In particular, it is not necessary to operate all components shown at a common production site. For example, it is possible to use the injection molding device ( 44 ) locally separate from the blowing device ( 45 ) and the preforms produced ( 1 ) intermediately store and / or transport. It is also possible to use the injection molding device ( 44 ) and the blowing device ( 45 ) to a common so-called single-stage system.

Alternatively to the illustrated sequence of filling the tube-shaped body ( 41 ) in a first step of closing the cutting region in a second production step, it is also possible first to close the cutting region and then to fill the tube-shaped container with already closed end region through the mouth section (FIG. 21 ). The concrete selected order of the single production steps takes place in dependence on the specifications of a respective user and on the characteristics of the product to be filled.

According to 6 is the cutting device ( 46 ) on the input side with an input device ( 50 ) and output side with an output device ( 51 ) Mistake. Between the input device ( 50 ) and the output device ( 51 ) is a separating device directly performing the separation ( 52 ) arranged.

According to one special process step is also thought of the cutting area after the execution the welding process reprocess to achieve an optimally designed edge contour. In particular, it is thought after the implementation of the welding process to perform a trimming of the edge along the weld. hereby a smooth edge is provided that is sharp and / or rough Avoid surface areas. The cutting process may be mechanical or using, for example another of those explained above Cutting or separation process can be performed. Alternatively it is also contemplated, instead of the above-described sequential implementation of welding process as well as trimming the border these two operations too at least partially parallel in time.

In dependence from the particular application and production conditions, the cutting process in the area of the welding edge both on an empty tube-like body and after performing a filling respectively.

When blowing the container ( 2 ) with the inventive design is ensured by suitable process parameters that a non-uniform application of the container wall to the inside of the blow mold ( 4 ) and thus uneven cooling is avoided. In particular, the corresponding blowing process is optimized in that first, without supplying a blowing pressure or only with low blowing pressure support, a complete stretching of the preform ( 1 ) he follows. Only after the stretching process, the transverse expansion of the preform ( 1 ) by the blowing pressure supply. Even with a non-uniform concern of the blown container ( 2 ) on the blow mold ( 4 ) is due to the already completed stretching of the preform ( 1 ) avoids the occurrence of unwanted unevenness in material distribution.

In particular, it proves to be advantageous to supply the blowing pressure not abruptly after the implementation of the stretching, but with relatively slow pressure build-up. This can be achieved, for example, in that a throttle is inserted into the supply line for the high pressure. With regard to the use of polypropylene as a material for the tube, a stretching factor in the range of 2 to 2.5 proves to be advantageous, the stretching factor the length ratio of the blown container ( 2 ) to the preform ( 1 ) describes.

Due to the material properties of the polypropylene, it also proves to be advantageous in the tempering of the preforms ( 1 ) a comparatively high rotational speed of the preforms ( 1 ) to specify their preform longitudinal axes. A fast rotation is understood to mean a speed of at least one revolution per second. Particularly preferred is a speed of at least two revolutions per second.

In the production of blown tube blanks with an at least partially oval-like basic contour takes place when carrying out the heating of the preforms ( 1 ) a non-uniform tempering in the circumferential direction. This tempering can for example be caused by the fact that the preforms ( 1 ) stepwise or with modulated rotational speed at the radiant heaters ( 30 ) are passed. In this case, the preforms ( 1 ) to position in the heating in the region of a support element, which passes through its trajectory cam-controlled. It can be an ex file and exactly reproducible temperature control.

The generation of the temperature profile in a circumferential direction of the preforms ( 1 ) takes place in particular in such a way that lower temperatures are generated in those wall regions which are shaped by the blow molding into the longitudinal sides of the oval-shaped basic contour of the blown container than in those wall regions which are assigned to the transverse sides which are formed during blow molding and shorter relative to the longitudinal sides , As a result, a withdrawal of material from these higher tempered areas is supported.

With regard to the implementation of the heating process, it proves to be advantageous, the preforms ( 1 ) between two opposing radiant heaters ( 30 ). There is thus a simultaneous heating in the respective opposite areas. This contributes to an exact realization of the given temperature profile.

According to a variant of the method, it is possible, the opposite sides of the preform ( 1 ) to heat unevenly intensively. As a result, in later produced container ( 2 ) generates a circumferentially defined uneven material distribution. As a result, the produced tube acquires predeterminable emptying properties or assumes a predeterminable curved contour.

7 shows a side view of a tube-shaped container ( 41 ) in the area of its mouth ( 21 ) opposite extent with a sealed seam ( 55 ) is provided. Along a course of the side wall of the container ( 41 ) the container ( 41 ) an undercut ( 56 ), in the region of which a distance of the side wall to the tube longitudinal axis ( 54 ) decreased. The undercut ( 46 ) is formed in the illustrated embodiment as a recess. For example, this indentation can be made concave. According to a further embodiment, the undercut ( 56 ) as a bulge of the side wall with increasing position to the longitudinal axis ( 54 ). In particular, a convex course of the undercut ( 56 ) thought.

8th shows an embodiment with a surface structure in the region of the tube-shaped container ( 41 ). In particular, the surface structure in the form of a texturing ( 57 ). The surface structure can have both functional properties with regard to improving a slip resistance when gripping the container, as well as aesthetic properties. For example, it is possible by the surface structuring the impression of Kondenswasserbil formation in the surface region of the container and thereby convey a freshness impression.

The surface structure can be determined both by surveys and by depressions in the area of surface of the blown container be generated. In particular, the use of polypropylene as Material for the container increases the free space in the specification of the surface design.

alternative on the use of abstract structures for the production of surface design it is also possible For example, a surface design similar to Moons, crescent moon, according to a starry sky, a given Motive to perform a decor or a company logo.

9 shows a further embodiment of the container. A corresponding container contour is essentially generated by the blowing process and the container is optionally - in a further production step as explained above with a sealed seam ( 55 ) Mistake.

Basically but an exclusive blastechnische production conceivable.

9 shows an embodiment in which the container ( 41 ) with a closure cap ( 58 ), which is transverse to a container longitudinal axis ( 59 ) has a substantially square cross-sectional area. Starting from a stand area ( 60 ), the cap tapers ( 58 ) similar to a truncated pyramid in the direction of the container longitudinal axis ( 59 ).

In the area of your stand area ( 60 ) is a side wall ( 61 ) of the closure cap ( 58 ) substantially continuously into a side wall ( 62 ) of the container ( 41 ). Starting from the cap ( 58 ) the side wall ( 62 ) of the container ( 41 ) around the container longitudinal axis ( 49 ) and runs in a flat tail ( 63 ) too. The tail ( 63 ) can be used as a seal ( 55 ).

9 illustrated in particular in the perspective view of the longitudinal axis ( 59 ) twisted course of the side walls ( 61 ). Starting from the cap ( 58 ) the side walls ( 61 ) in the direction of the container longitudinal axis ( 59 ) first as a continuation of the truncated cone-like contour of the closure cap ( 58 ) and span here transversely to the longitudinal axis ( 59 ) has a substantially square base. Each two in corner areas ( 64 ) contiguous side walls ( 62 ) are due to the rotation about the container longitudinal axis ( 59 ) are guided around such that in the region of the end piece ( 63 ) are arranged side by side in a common plane. A course of the opposite corner area ( 64 ) against each other side walls ( 62 ) is complementary to this course, so that in the region of the end piece ( 63 ) a tube-like design is provided.

By the corresponding course of the side walls ( 62 ) in the area of the end piece ( 63 ) starting from the cap ( 58 ) side walls ( 61 ) flat against each other or are merged into each other by a curvature.

Claims (55)

Method for producing a tube-like body, characterized in that the following method steps are carried out successively: a) injection molding production of a preform ( 1 ) of a thermoplastic material, b) inserting the preform ( 1 ) in a blow mold ( 4 ), c) biaxially expanding the preform ( 1 ) to a container ( 2 ) by stretching and supplying a pressurized blown gas, d) molding the container ( 2 ) with a design that deviates in a side wall region between a mouth portion and a bottom opposite the mouth portion at least partially from a cylindrical base contour, e) removal of the container ( 2 ) from the blow mold ( 4 ), f) cutting off the ground area ( 42 ) of the container ( 2 ) g) closing the mouth section ( 21 ) opposite end portion. Method according to claim 1, characterized in that the production of the container ( 2 ) is carried out in a two-stage process. Method according to claim 1, characterized in that the production of the container ( 2 ) is carried out in a one-step process. Method according to one of claims 1 to 3, characterized in that the stretching operation using a stretching rod ( 11 ) is carried out. Method according to one of claims 1 to 4, characterized in that the container ( 2 ) from a preform ( 1 ) is made with a monolayer structure. Method according to one of claims 1 to 4, characterized in that the container ( 2 ) from a preform ( 1 ) is manufactured with a multilayer structure. Method according to one of claims 1 to 6, characterized in that as a container ( 2 ) a bottle-shaped container is produced. Method according to one of claims 1 to 7, characterized in that as a tube-like body ( 41 ) a tube is made. Method according to one of claims 1 to 8, characterized in that the body ( 41 ) in the direction of a tube longitudinal axis ( 54 ) is provided with an undercut. Method according to claim 9, characterized in that that the Undercut formed as a bulge becomes. Method according to claim 9, characterized in that that the Undercut is formed as a recess. Method according to one of claims 1 to 11, characterized in that the container ( 41 ) is made with a curved centerline. Method according to one of claims 1 to 12, characterized in that the container ( 41 ) in the direction of the tube longitudinal axis, starting from the mouth portion ( 21 ) towards the cutting edge ( 49 ) rejuvenated. Method according to one of claims 1 to 12, characterized in that the container ( 41 ) in the direction of the tube longitudinal axis, starting from the mouth portion ( 21 ) towards the cutting edge ( 49 ) expanded. Method according to one of claims 1 to 14, characterized in that the container ( 41 ) in the region of its side wall substantially parallel to the tube longitudinal axis ( 54 ) has extending edges. Method according to one of claims 1 to 15, characterized in that the container ( 41 ) in a transverse to the tube longitudinal axis ( 54 ) extending cross-sectional area is formed as a polygon. Method according to one of Claims 1 to 16, characterized in that the container ( 41 ) is formed in the region of its outer surface at least partially with a texturing. Method according to one of claims 1 to 16, characterized in that the container ( 41 ) is formed in the region of its outer surface at least partially with a mirror surface. Method according to one of claims 1 to 15, characterized in that the container ( 41 ) in a transverse to the tube longitudinal axis ( 54 ) extending cross-sectional area is oval-shaped. Method according to one of claims 1 to 19, characterized that the container in the region of its side wall with a circumferentially extending the essentially uniform material thickness is provided. Method according to one of claims 1 to 19, characterized that the container in the region of its side wall with a circumferentially extending substantially uneven material thickness is provided. Method according to one of claims 1 to 21, characterized in that in the region of the cut edge ( 49 ) A weld is produced as a decorative element. Method according to one of claims 1 to 22, characterized in that the container ( 41 ) is produced in the region of the weld with a Halterungsausnehmung. Method according to one of claims 1 to 23, characterized in that the container ( 41 ) is made of polypropylene. Method according to one of claims 1 to 24, characterized in that during the blow molding of the container ( 2 ) a Blasgaszufuhr is performed only after completion of the stretching process. Method according to one of claims 1 to 25, characterized that the Blowing pressure is supplied with a slow pressure increase of at most 100 bar / second. Method according to one of Claims 1 to 26, characterized that the Blowing pressure is supplied with the interposition of a throttle. Process according to one of Claims 1 to 27, characterized in that the stretching process has a draw ratio of not more than 2.0 to 2.5 relative to the length of the container ( 2 ) relative to the preform ( 1 ) is carried out. Method according to one of claims 1 to 28, characterized in that when carrying out a non-uniform temperature control of the preform ( 1 ) the preform ( 1 ) simultaneously from two opposing radiant heaters ( 30 ) is heated. Process according to claim 29, characterized in that the preforms ( 1 ) are heated unevenly on opposite sides. Method according to one of claims 1 to 30, characterized in that the preforms ( 1 ) are held while carrying out their heating by a transport element, which is coupled to a mechanical position control, which predefines rotational movements of the preform. Method according to one of claims 1 to 31, characterized in that the preform ( 1 ) is rotated about its longitudinal axis during the implementation of a basic temperature control at a speed of at least two revolutions per second. Tubular body formed as a severed part of a blow molded and biaxially oriented container of a thermoplastic material, characterized in that a sidewall portion of the body extending between a mouth portion (Fig. 21 ) and a mouth section ( 21 ) arranged opposite arranged closed end portion of the body, at least partially having a different from a cylindrical base contour design. Body according to claim 33, characterized in that the design deviating from the basic cylindrical contour is in the direction of a tube longitudinal axis ( 54 ) extending undercut is formed. body according to claim 34, characterized in that the undercut as a Bulge formed is. body according to claim 34, characterized in that the undercut as a Indentation is formed. body according to one of the claims 33 to 36, characterized in that a center line of the body bent extends. Body according to one of Claims 33 to 37, characterized in that the side wall region extends from the mouth section ( 31 ) in the direction of a sealed seam ( 55 ) rejuvenated. Body according to one of Claims 33 to 37, characterized in that the side wall region extends from the mouth section ( 31 ) in Direction to a sealed seam ( 55 ) expanded. Body according to one of Claims 33 to 39, characterized in that the side wall region of the body is substantially parallel to the tube longitudinal axis ( 54 ) has arranged edges. Body according to one of claims 33 to 40, characterized in that a substantially perpendicular to the tube longitudinal axis ( 54 ) arranged cross-sectional area is formed as a polygon. body according to one of the claims 33 to 41, characterized in that an outer surface of the side wall portion at least partially provided with a texturing. body according to one of the claims 33 to 42, characterized in that the surface structure of the sidewall region has functional properties. body according to one of the claims 33 to 42, characterized in that the surface structure the side wall area has creative properties. body according to one of the claims 33 to 44, characterized in that an outer surface of the side wall portion at least partially provided with a mirror surface. Body according to one of claims 33 to 45, characterized in that a substantially perpendicular to the tube longitudinal axis ( 54 ) arranged cross-sectional area is oval-shaped. body according to one of the claims 33 to 46, characterized in that a side wall of the body in a circumferential direction has a substantially uniform wall thickness. body according to one of the claims 33 to 46, characterized in that a side wall of the body in a circumferential direction has a substantially non-uniform wall thickness. Body according to one of claims 33 to 48, characterized in that the sealing seam ( 55 ) is designed as a decorative element. Body according to one of claims 33 to 49, characterized in that in the region of the sealing seam ( 55 ) A Halterungsausnehmung is arranged. body according to one of the claims 33 to 50, characterized in that the thermoplastic material is designed as polypropylene. Hollow body which is at least partially formed as a blow molded and biaxially oriented container made of a thermoplastic material and which is provided in a mouth portion with a closure cap, characterized in that a side wall ( 42 ) of the container ( 41 ) relative to a container longitudinal axis ( 59 ) Has at least partially a helically twisted running contour. Hollow body according to claim 52, characterized in that the closure cap ( 58 ) a substantially square base ( 60 ) having. Hollow body according to claim 52 or 53, characterized in that the side walls ( 62 ) in one of the closure cap ( 58 ) facing away from each other are flat in one another. hollow body according to one of the claims 52 to 54, characterized in that the hollow body formed as a tube is.