WO2007098837A1

WO2007098837A1 - Production process for extrusion-blow-moulded plastics bottles and extrusion-blow-moulded plastics bottle

Info

Publication number: WO2007098837A1
Application number: PCT/EP2007/000718
Authority: WO
Inventors: Johann KÜNZ
Original assignee: Alpla-Werke Alwin Lehner Gmbh & Co. Kg
Priority date: 2006-02-27
Filing date: 2007-01-27
Publication date: 2007-09-07

Abstract

In an inventive process for the production of plastics bottles (70) in an extrusion-blow-moulding process, a plastics tube is extruded in one or more layers through an extrusion die (5) whose width is adjustable in an extrusion head (4). One or more sections of the plastics tube is/are provided with one or more axial regions (71) different from the rest of the plastics tube, and the material of these comprises, when compared with the remainder of the plastics tube, a different plastics composition or a different colour. The extruded plastics tube is introduced into a mould cavity (7) of a blow-mould arrangement (1) and by virtue of superatmospheric pressure is blown to give a plastics bottle in accordance with the mould cavity. A feature of the inventive process is that the plastics material for the region different from the remainder of the plastics tube is fed to the extruded plastics tube at distance of from 0.5 mm to 3 mm prior to the discharge gap (54) of the extruded die (5), and the wall thickness of the extruded plastics tube in the region with the feed corresponds to the wall thickness of the plastics tube in the adjoining regions.

Description

1040-11773

Manufacturing process for extrusion blown plastic bottles and extrusion blown

Plastic bottle

The invention relates to a production method for extrusion blown plastic bottles according to the preamble of claim 1. The invention also relates to plastic bottles produced by the method.

The usual in the past containers made of white or stained, glass or ceramic are increasingly being replaced by plastic containers. In particular, for the packaging of fluid substances, such as beverages, household products, care products, cosmetics, etc., mainly plastic containers are used. The low weight and the lower costs certainly play a significant role in this substitution. The use of recyclable plastic materials and the generally more favorable overall energy balance during their production also contribute to promoting consumer acceptance of plastic containers, in particular plastic bottles.

The production of plastic bottles, for example of polyethylene or polypropylene, is often carried out in an extrusion blow molding process, in particular in a tubular blowing process. In this case, a plastic tube is extruded from an extruder head, introduced into a Blasformwerkzeuganordnung, inflated via a mandrel by overpressure and cured. The extrusion blow molding machines used for this purpose generally have at least one extruder for feeding the plastic material. The outlet of the extruder is connected to the extruder head, at the outlet opening of which is preferably adjustable in the opening width, the extruded tube emerges. The extrusion of the plastic tube can be continuous or quasi-continuous. The plastic hose can be extruded in one or more layers, it can be extruded with visible strips, decor strips or, with respect to the circumference, with a plurality of, for example different, segments. The extruded tube is transferred to a blow mold assembly and inflated by overpressure by means of a blow mandrel retracted into the mold cavity. Thereafter, the inflated according to the mold cavity plastic bottle is removed from the mold cavity. Extrusion-blown plastic bottles are already known from the prior art, which have differently colored areas and / or are provided with longitudinally extending decorative strips. The color graduated areas or stripes generally have no technical function and serve only to change the appearance of the plastic bottle. In the known plastic bottles, the contrasting areas or strips have a relatively long transition region, in which the base color merges into the color-contrasting region or changes from this back to the base color. Sometimes this effect may be intended; however, it is usually visually less appealing and does not achieve the desired effect. These transitions with the conventional production methods over a long distance are also the reason why currently plastic bottles, in which the contrasting areas and / or striped areas have a technical function, are not used.

DE-A-3718 605 already discloses a method for producing hollow plastic articles made of different materials, in which the supply of the different materials can be controlled via a mandrel that can be adjusted axially in the extrusion die. In the axial adjustment of the mandrel, however, the gap width of the extrusion nozzle also always changes in some areas. This fact makes it difficult to produce plastic articles with regions of different materials in the adjacent areas with constant wall thicknesses. The process described in DE-A-3718605 is suitable for the manufacture of components of the car interiors such as e.g. Armrests, footrests, knee bolsters, console boxes and lids, post panels, rear spoilers and bumpers for steering wheels, or for the production of suitcases for musical instruments, toilet seats, tool boxes and coolers. All these objects are characterized by a relatively large wall thickness, in which slight regional variations in thickness play no role. However, this method is not suitable for the production of plastic bottles.

From EP-AI 340 683 an extrusion process for the production of plastic bottles is known, in which the plastic bottle is provided in regions with thickened areas which consist of a different material from the rest of the plastic material. can. To produce the thickened areas, the additional material is added after the exit slit of the extrusion die to the base material of the extruded plastic hose and additionally applied at the desired locations. By this method, plastic bottles are to be produced, which have partially reinforced portions. In particular, the method is proposed for the production of extrusion blown plastic bottles with reinforced neck area.

From DE-C-19534514 a method for area wise coating of a cheaper material consisting carrier part with a higher quality material is known. For this purpose, a pre-hose is extruded from the carrier material via a first extrusion device. The pre-hose is guided in a mold. Via a second extrusion device and distributor elements and segments, the coating material is applied to the previously formed carrier material. The method can be used for example for the partial sheathing of pipes and the like. For the production of plastic bottles, the method described is not suitable.

On the other hand, the object of the present invention is to modify an extrusion process for plastic bottles in such a way that they can be provided, to the desired extent, with ring-shaped or strip-shaped regions which are different from the rest of the plastic bottle. The areas should be able to be created in a different color and / or have different mechanical and / or surface properties. Long transition regions of the different materials or the differently colored plastics should be avoided. The different areas of the other plastic bottle should have the same wall thickness, as the adjoining sections. In this way, not only visually appealing plastic bottles should be produced, but it should also be produced plastic bottles with areas that have a specific technical function, without affecting the overall rigidity of the plastic bottle. The object of the invention is furthermore to produce such extrusion-blown plastic bottles with areas or strips of a material deviating from the rest of the bottle material, which also serve a technical purpose. The solution to these problems consists in a method which has the method steps mentioned in the characterizing portion of claim 1. Further developments and / or advantageous embodiments of the invention are the subject of the dependent method claims. Extrusion blown plastic bottles, whose formation with strips serves a technical purpose are the subject of the device claims.

In a method according to the invention for the production of plastic bottles, in an extrusion blow molding method, a plastic tube is extruded in one or more layers through an extrusion nozzle of an extruder head which is adjustable in terms of its width. One or more portions of the plastic tubing are provided with one or more axially extending portions whose material is of a different plastic composition or color than the remainder of the plastic tubing. The extruded plastic tube is introduced into a mold cavity of a blow mold and inflated by overpressure according to the mold cavity to a plastic bottle. The inventive method is characterized in that the plastic material for the other plastic hose different area the extruded plastic tube at a distance of 0.5 mm to 3 mm in front of the exit slit of the extrusion die the extruded plastic tube is metered, and the wall thickness of the extruded plastic tube in metered area corresponds to the wall thickness of the plastic tube in the adjacent areas.

By the plastic material is metered in almost immediately before the exit slit of the extrusion die, very short transitions from the tubing to the different areas and vice versa can be realized. The axial length of the transitions is only about 2 mm to about 10 mm. For example, within a length of only about 10 mm, a color transition from black to white is feasible. The reason for the short transitions is that the plastic material in the extruder head only has to be transported over relatively short distances. This allows the channels over which the plastic material is metered to be cleaned in a much shorter period of time and recharged with the original tubing. Conversely, if necessary, the plastic material used to create the regions other than the rest of the tubing can displace the original tubing much more quickly and provide the extreme traditional plastic tube are dosed. The possibility remains to create by lower metering pressures and longer transitions, especially color transitions. The process control is designed such that the extruded plastic tube in the areas with the metered plastic material has the same wall thickness as in the adjoining areas. This ensures that the desired properties in the dosed areas depend solely on the type of dosed material. In addition, the overall properties of the plastic bottle produced by the process according to the invention are not impaired by unwanted wall thickening. In addition, the total amount of material used per plastic bottle is kept essentially the same.

While the plastic tube is expediently extruded continuously, it proves to be advantageous for the creation of transitions that are as short as possible if the plastic material for the areas to be created is metered in time from a buffer in the extruder head. The use of a buffer allows even shorter channel lengths, in which the plastic material for creating the different areas under displacement of the tubing are introduced or from which it must be displaced again.

A very expedient process variant provides that the plastic material for the regions to be created is temporarily stored in an annular space which is arranged in a section of a nozzle body which surrounds a height-adjustable mandrel with a cone-shaped, shallow-shaped enlargement. Only when required is the plastic material from the annular space metered in through one or more outlet openings, which communicate with the annular space.

As a plastic material that is metered to create the different areas, for example, a plastic material is selected, which in the polymerized state of the material of the other extruded plastic tube different mechanical properties and / or surface properties, in particular a greater roughness. This variant of the method proves to be particularly advantageous for creating special gripping areas on the plastic bottles. While the bottle generally has as smooth a surface as possible, it is in the gripping area with a larger Provided roughness. As a result, it can be much better grasped and held by the user and he has a significantly improved slip resistance. Instead of a plastic material with greater roughness and a plastic material can be added, which has a certain tack in the polymerized state. In the polymerized state, for example, the metered-in plastic material can also have a higher or lower strength than the remaining hose material. As a result, bottles with selectively reinforced or weakened areas can be produced if required.

By virtue of the fact that the metered plastic material has a color different from the color of the remaining plastic tube, it is easier for the user, for example, to better clarify the arrangement of the gripping area. This measure can be provided alternatively or cumulatively to the arrangement of one or more areas with a greater roughness.

Conveniently, the material for the color of the metered plastic material is metered into a temporary storage just before the introduction of the plastic material. As a result, the color transitions can be kept very short.

The metered plastic materials are conveniently chosen from the plastic group containing polyolefins and mixtures thereof, thermoplastic PE, HDPE, LDPE or blowable PET. The cited materials are very good extrudable and generally good combined with each other. It is understood, however, that the choice of the metered plastic material is highly dependent on the base material of the extruded plastic tube.

A variant of the method provides that over the axial length of the extruded plastic tube, a plurality of deviating from the rest of the tubing areas are created, which are axially spaced from each other. For example, the area with the Mün- fertil the later bottle and the area merging into the ground are formed differently. The one or more areas may be annularly formed circumferentially, they can also be arranged distributed in strips over the circumference of the plastic tube. The strip-shaped areas are parallel to each other. The Stripes- shaped areas can be made at least partially with mutually different colors.

The plastic tube can be extruded one or more layers. For the use of mill regenerate material, it proves to be expedient if the plastic tube is extruded at least two layers. The layer with the mill regenerate is arranged inside the outer layer of the extruded plastic tube. However, the plastic tube can also have more layers, for example six layers, and in addition be provided with surface-layered color layers. It proves to be advantageous if the plastic hose is at least partially formed multi-layered and in particular in the differently colored areas having a substantially neutral white base layer. This base layer is closer to the bottle interior than the colored material layer. In this way, a defined coloration of the colored areas can be guaranteed even when using mill regenerate, which may have color variations.

An inventive extrusion-blown plastic bottle is provided in one or more sections with at least one axially extending portion which differs from the rest of the bottle material. The at least one region has different mechanical properties and / or surface properties from the remaining bottle. The so extrusion-blown plastic bottles have by the different areas, for example, increased or reduced strengths. As a result, the elasticity can be selectively controlled in the circumferential direction. Thus, e.g. the portion of the bottle in which a label is subsequently applied, have a greater strength. This facilitates the placement of a label. Alternatively, the bottle may have a greater elasticity in a certain portion of its extension and / or its circumference, for example to allow for targeted hot deformations, etc.

A variant of the extrusion-blown plastic bottle provides that the at least one different area has a greater roughness than the material of the others Bottle. Instead of a larger roughness, the area may also have some stickiness.

The at least one different area is arranged in a suitable execution variant of the plastic bottle in a gripping section, for example in order to reinforce it there or to make it more tangible and durable for the user due to increased roughness or some stickiness. The gripping portion may be provided on the body of the bottle. For plastic bottles that have a handle, it is advantageous that this equipped with the area other than the rest of the bottle material area. Again, an increased roughness or some stickiness of the different area facilitates the slip resistance when gripping and holding the plastic bottle.

Another variant of the extrusion-blown plastic bottle has several areas which are different from the other container material. These can be axially spaced from each other and / or arranged in a strip shape distributed over the circumference of the bottle. The different areas may be provided on a gripping portion in the body part of the plastic bottle or also be arranged above and below the gripping portion. As an alternative or in addition to the mechanical properties and / or surface properties that differ from the rest of the bottle, the annular or strip-like regions may also have a different color from the rest of the container. In this way, the user is for example signaled where the plastic bottle is best to take. In strip-like areas, the stripes may even be colored differently.

The areas other than the rest of the container material advantageously have a course length in the axial direction which is approximately 2 mm to approximately 10 mm. As a result, the areas of different mechanical properties and / or surface properties are located relatively accurately on the container. Long transition areas with indefinable mixing properties are thus avoided.

The extrusion blown plastic bottle can be constructed in one or more layers. Advantageously, however, it has a multilayer wall of at least two layers. In this case, a plastic layer arranged within the outer layer may also comprise mill regenerate material. The use of mill regenerate material is advantageous for cost reasons and moreover takes account of environmental aspects.

Further advantages and features will become apparent from the following description of exemplary embodiments of the invention with reference to the schematic figures. It shows in not to scale representation:

1 shows a schematic representation of an extrusion blow molding machine with extruder head and blow molding device;

2 is a schematic sectional view of a part of the extruder head with an extrusion nozzle; and

Fig. 3 - Fig. 6 are schematic representations of exemplary embodiments of provided with axially striped areas plastic bottles.

The extrusion blow molding machine of the prior art, which is shown in principle in FIG. 1, is provided overall with the reference number 1. The construction of such long-stroke extrusion blow molding machines is well known and is described, for example, in "Blow molding handbook, edited by Donald V. Rosato and Dominick V. Rosato, 1989, ISBN 1-56990-089-2, Library of Congress Catalog Number 88-016270" described. The illustration in FIG. 1 is therefore limited to the components of the extrusion blow molding machine 1 that are absolutely necessary for the understanding. The two-station blow molding machine illustrated has, for example, an extrusion unit 2 and two blowing stations 12, 13. The extrusion unit 2 comprises at least one extruder 3 for plastic granules and an extruder head 4 connected thereto, which has at least one extrusion die 5. The blowing stations 12, 13 each have a blowing head with a blowing mandrel. Each blast station 12, 13 is equipped with a blow molding table 14, 15 in which blow molds 6 are mounted. The blow molding tools 6 each enclose a blow mold cavity 7, which corresponds to the shape of the hollow body to be produced, for example a bottle. The blow molding cavities 7 have an opening 8 on their upper side facing the extruder head 4. The blow molding tables 14, 15 are alternately from their lateral end positions in FIG the blowing stations 12, 13 displaceable in a position in which the mouth of the blow molding tool 6 with the exit of the extrusion die 5 axially aligned. The lateral displacement of the blow molding tables 14, 15 takes place substantially perpendicular to the longitudinal extension of the extruder 3 and is indicated in FIG. 1 by double arrows H.

The supplied via the extruder 3 plastic granules is melted in the extruder 3 and / or in the extruder head 4 and extruded from the extrusion die 5 as an endless plastic tube. The plastic tube can be extruded one or more layers. For the extrusion of a multilayer plastic hose further extru are provided which transport the required different plastic materials to the extruder head 4. The blow molding tables 14, 15 with the blow molding tools 6 are moved alternately from their end positions in the blowing stations 12, 13 laterally under the extruder head 4, the blow molds 6 are opened and a piece of extruded plastic tube picked. Thereafter, the respective blow molding table 14, 15 is moved back again into its end position in the blowing station 12 or 13. There, the hollow body is then inflated by means of a retracted through the mouth 8 in the cavity 7 mandrel. The finished hollow body is ejected and the cycle repeated. While a hose is being inflated in one blow molding station 12, the blow molding table 15 of the second blowing station 13 is moved laterally under the extruder head 4 to pick up another piece of the extruded plastic hose. In this way, a continuous operation is possible.

2 shows a sectional illustration of a lower section of the extruder head 4 with the extrusion die 5 facing the respective blow molding table when transferring the extruded plastic tube. The extrusion die 5 comprises a nozzle body 51 in whose central extrusion channel 41 a coaxially arranged mandrel 52 with a cone - truncated extension 53 is guided height adjustable. The nozzle body 51 and the mandrel 52 are preferably replaceably mounted in the extruder head 4. By the height adjustment of the dome 52, the width of the exit slit 54 of the extrusion die 5 is adjustable to vary the thickness of the extruded plastic tube, if necessary. In the free end of the mandrel 52 facing end portion of the nozzle body 51 an annular space 55 is recessed, which can be fed via a feed channel 56 with molten plastic material. The annular space 55 is above or a plurality of outlet openings 57 with the central extrusion channel 41 in connection. The outlet opening 57 may be formed as an annular gap. It can also be provided a plurality of outlet openings 57, which are arranged annularly around the mandrel 52. The outlet openings 57 are arranged in the immediate vicinity of the outlet gap 54 of the extrusion die 5. The distance of the outlet openings 57 from the outlet gap 54 of the extrusion die 5 is preferably about 0.5 mm to about 3 mm.

The material for the single-layer or multi-layered tube extruded at the outlet gap 54 of the extrusion die 5 is preferably conveyed continuously through the central extrusion channel 41. For this purpose, the material, which is usually initially in granular form, fed into an extruder, liquefied and transported to the extruder head. For a multilayer extrusion usually several extruders are provided, which transport the material in the liquefied state to the extruder head. Substantially annular feed openings for the various layers open into the central extrusion channel 41 in succession. By changing the width of the exit gap 54, the thickness of the extruded plastic tube can be adjusted as required. The at least one outlet opening 57 communicating with the annular space 55 serves to produce ring-shaped regions extending in the axial direction with mechanical properties and / or surface properties which differ from the rest of the tube material. If a plurality of outlet openings 57 are provided, strip-shaped regions extending in the axial direction and distributed over the circumference of the extruded plastic tube can be created. While the plastic tube is preferably extruded continuously, the application of the plastic material for the annular circumferential or strip-like regions is timed from a temporary store in the extruder head 4. In the illustrated embodiment, the annular space 55 forms this intermediate store. The annular space 55 may also be formed segmented. In this way, different areas can be created over the circumference of the extruded plastic tube.

In the following, the method will be explained in more detail using the example of a plastic hose to be provided with identical strip-shaped regions. The plastic material for the strip-shaped regions is fed to the extruder head 4 via an extruder and conveyed via the supply passage 56 in the annular space 55, the outlet openings 57 open into the central extrusion channel 41. The number of outlet openings 57 corresponds to the number of strip-shaped areas to be created. The width of the exit openings 57 measured in the circumferential direction of the extrusion nozzle 5 determines the width of the strip-shaped areas. For the creation of the strip-shaped regions, a plastic material is selected which has a different composition and / or a different color than the base material for the extruded plastic tube. In the polymerized state, the strip-shaped regions should have different mechanical properties and / or surface properties than the rest of the extruded from the extruded plastic tube container. Depending on the base material of the extruded plastic tube, polyolefins or mixtures of polyolefins, thermoplastic PE, HDPE, LDPE or blowable PET are suitable as plastic material for the production of the strip-shaped regions. If the strip-shaped regions are to have a different color than the remaining extruded plastic tube, then the usually liquid coloring material is not introduced into the supply channel 56 until shortly before entry into the annular space 55. In the case of a segmented annular space 55, different colors can be added to each segment. In this way, the extruded plastic tube can be provided with strip-shaped areas, which have different colors from each other.

FIGS. 3-6 show examples of plastic bottles each having the reference numeral 70 and having one or more strip-shaped regions 71. In the plastic bottle 70 shown in two views in FIGS. 3 and 4, a single strip-shaped area 71 is provided, which is provided substantially in the area of a bottle handle 72. The strip-shaped region 71 has a deviating from the other plastic bottle 70, in particular larger roughness. As a result, the slip resistance is improved. The user can grasp the plastic bottle better and keep it safer. To better illustrate the strip-shaped region 71, this in Fig. 3 and 4, a different color than the remaining plastic bottle 70. It is understood, however, that the bottle grip 72 engaging strip-shaped portion 71 may also have the same color as the rest of the plastic bottle 70th , In the illustrated in Fig. 5 plastic bottle, which in turn carries the reference numeral 70, a plurality of strip-shaped portions 71 are provided which are substantially parallel to each other and in a gripping portion 72 of the bottle are arranged. In such an arrangement, it proves to be advantageous if the strip-shaped areas 71 have a different color from the rest of the container 70 to signal the user the gripping portion 72 of the plastic bottle 70. The strip-shaped regions 71 in the gripping section 72, for example, in turn have a greater roughness than the rest of the bottle 70. The strip-shaped regions 71 may also have a greater strength than the remaining plastic bottle 70, so that it can be better grasped and the gripping portion 72 is not excessive deformed.

In the case of the plastic bottle 70 indicated in FIG. 6, sections 73, 74 with a plurality of strip-shaped regions 71 extending in parallel are provided above and below a gripping section 72 of the bottle. The strip-shaped areas 71 have a different color from the rest of the plastic bottle and the user example, the between the two sections 73, 74 with strip-shaped areas 71 located gripping portion 72 of the bottle 70 indicate. In this embodiment, the different colors suffice to achieve the intended effect. However, it is understood that the strip-shaped regions 71 can also have different mechanical properties or surface properties from the remaining container material.

The extrusion-blown plastic bottles shown in FIGS. 3 to 6, for example, are each provided with strip-shaped regions. It is understood that the regions with different material properties can also be annular. In this case, the plastic bottle can be equipped with only one annular area or also have a plurality of axially spaced annular areas.

The inventive method allows the production of annular or strip-shaped areas with relatively short axial transitions from the plastic material of the extruded tube to the plastic material of different areas and vice versa. The axial length of the transitions is about 2 mm to about 10 mm. For example, within only about 10 mm of the process, color transitions from black to To achieve white. If required, however, longer color transitions can be made.

The inventive method can be used in conjunction with single or multi-layer extruded plastic tubing. Preferably, the plastic tube is extruded in a multi-layered manner with at least 2 layers, wherein a plastic layer arranged within the outer layer comprises mill regenerate material.

Claims

claims

1. A process for the production of plastic bottles in a Extrusionblasverfah- ren, in which a plastic tube one or more layers by an adjustable in terms of their extrusion extrusion nozzle (5) of an extruder head (4) is extruded and at least a portion of the plastic hose with at least one in the axial direction extending portion (71) is provided, whose material has a different plastic composition or a different color than the rest of ge plastic hose, and the extruded plastic tube in a mold cavity

(7) a blow mold and introduced by overpressure according to the mold cavity (7) to a plastic bottle (70) is inflated, characterized in that the plastic material for the other plastic hose different area (71) the extruded plastic tube at a distance of 0.5 mm to 3 mm in front of an outlet gap (54) of the extrusion die (5) the extruded plastic tube is metered, and the wall thickness of the extruded plastic tube in the dosed portion of the wall thickness of the plastic hose in the adjacent areas.

2. The method according to claim 1, characterized in that the plastic tube is extruded continuously and the plastic material for the or the other plastic hose different area (s) (71) timed from a buffer in the extruder head (4) is metered.

3. The method according to claim 2, characterized in that the plastic material for the or the other plastic hose different area (s) (71) in an annular space (55) is temporarily stored, which is arranged in a portion of a nozzle body (51) , which surrounds a height-adjustable mandrel (52) with a frusto-conical extension (53), and if necessary by one or more outlet openings (57) is dosed, the number of

Number of over the circumference of the plastic tube to create areas (71) corresponds, and with the annular space (55) are in communication.

4. The method according to any one of the preceding claims, characterized in that for the preparation of the at least one region (71) a plastic material is added, the hose in the polymerized state of the plastic material of the remaining extruded plastic has different mechanical properties and / or surface properties.

5. The method according to claim 4, characterized in that for the creation of the at least one region (71) a plastic material is added, which has a greater roughness in the polymerized state than the material of the other plastic hose.

6. The method according to any one of the preceding claims, characterized in that a plastic material is metered in, the color of which is different from the color of the remaining plastic tube.

7. The method according to claim 6, characterized in that the material for the coloring of the metered plastic material is added just before the introduction of the plastic material into a buffer (55).

8. The method according to any one of the preceding claims, characterized in that depending on the plastic material of the plastic tube, the metered plastic material from the group consisting of polyolefins, mixtures of polyolefins, thermoplastic PE, HDPE, LDPE, or blasbarem PET is selected.

9. The method according to any one of the preceding claims, characterized in that in the axial extrusion direction a plurality of other plastic tube different regions (71) are created, which are arranged at a distance from each other.

10. The method according to any one of the preceding claims, characterized in that over the circumference of the plastic tube a plurality of strip-shaped areas (71) are created.

11. The method according to any one of the preceding claims, characterized in that the other plastic hose other areas (71) are created at least in part with different coloring.

12. The method according to any one of the preceding claims, characterized in that the plastic tube is multi-layered, preferably at least two layers, extruded and one of the plastic layers, which does not form the outer layer comprises mill regenerate material.

13. The method according to claim 11 or 12, characterized in that the plastic tube is extruded multi-layered, and in particular in the areas which are to be created with a different coloration, has a substantially neutral white layer, which is closer to the bottle interior than the colored area ,

14. Extrusion-blown plastic bottle, which is provided in one or more sections with at least one axially extending portion (71) which is formed differently from the rest of the bottle material, characterized in that the at least one region (71) of the remaining plastic bottle has different mechanical properties and / or surface properties and the wall thickness of the area corresponds to that of the adjacent sections.

15. Extrusion-blown plastic bottle according to claim 14, characterized in that the at least one region (71) has a greater roughness than the material of the remaining plastic bottle (70).

16. An extrusion-blown plastic bottle according to claim 14 or 15, character- ized in that the at least one strip-like region (71) in a gripping portion (72) of the bottle (70) is arranged.

17. Extrusion blown plastic bottle according to any one of claims 14-16, characterized in that the bottle (70) portion as a gripping a handle (72) and the region (71) is arranged on the handle.

18. Extrusion blown plastic bottle according to one of claims 14-16, characterized in that a plurality of other bottle material different areas (71) are provided.

19. Extrusion-blown plastic bottle according to claim 18, characterized marked, that the areas (73, 74) are arranged at an axial distance from each other.

20. An extrusion-blown plastic bottle according to claim 18 or 19, characterized in that a plurality of regions (71) are arranged over the circumference of the bottle, which are formed strip-shaped and extend substantially parallel to each other.

21. Extrusion-blown plastic bottle according to claim 20, characterized in that the strip-like regions (71) in a gripping portion (72) of the bottle

(70) are arranged.

22. Extrusion blown plastic bottle according to claim 22, characterized in that the bottle (70) above and below a gripping portion (72) each have a portion (73, 74) having a plurality of strip-like areas (71).

23. Extrusion-blown plastic bottle according to one of claims 14 - 22, characterized in that the other bottle material different areas

(71) in the axial direction have a course length which is about 2 mm to about 10 mm.

24. Extrusion blown plastic bottle according to one of claims 14 - 23, characterized in that the areas (71) have a different color from the rest of the bottle (70).

25. An extrusion-blown plastic bottle according to any one of claims 14 - 24, characterized in that the bottle (70) has a multi-layered wall having at least two layers and the layer which does not form the outer layer comprises mill regenerate material.