JP2003507207A - Apparatus and method for manufacturing corrugated plastic tubing - Google Patents

Abstract

(57) Abstract An apparatus for producing corrugated plastic tubes having a nominal width of less than 10 mm is described. Said device comprises an extrusion means 2, a vertically oriented injection head 7, and a vertically oriented corrugator 8 with a vertical molding cavity 35. The injection head 7 has a relatively short nozzle in the axial direction having an annular gap 70. The injection head is configured such that the annular gap 70 is arranged outside the molding cavity, specifically at a certain distance from the upper inflow end of the molding cavity 35.

Description

Detailed Description of the Invention

The invention relates to an apparatus for producing plastic pipes, in particular corrugated plastic pipes, with a nominal width of less than 10 mm, which is connected to at least one extrusion means and downstream of the extrusion means in the production direction and to an operating position. At least one injection head that is oriented vertically in the manufacturing direction and has at least one annular gap, and is connected downstream of the injection head in the manufacturing direction, is oriented vertically in the operating position, and ejects from the annular gap of the injection head. TECHNICAL FIELD The present invention relates to an apparatus provided with a molding clamp for forming a corrugated plastic tube from a jet of molten plastic material, for example, a molding cavity formed by moving the clamp of a corrugating molder.

The present invention is a method for producing a plastic tube, in particular a corrugated plastic tube, with a nominal width of less than 10 mm, in which a mass of plastic material is connected by an extrusion means downstream of the extrusion means and in an operating position. In the form of a jet of molten plastic material from a vertically oriented injection head in the mold by moving a molding sandwich, for example a sandwich of a corrugator, whereby the jet of molten plastic material is depressurized externally and / or internally. It further relates to the method of being forced by pressure into a molding cavity which comes into contact during molding.

DE-A-197 24 857 discloses such a device and method, except for the production of corrugated pipes or pipes with a large outer diameter, on the order of 1-2 m. The shaping section, which is also vertically oriented, is formed by the nips of the corrugator, which in turn move in steps by means of a suitably driven pivot arm. The injection head, which is also vertically oriented, injects relatively far into the molding part. The injection head is connected to a calibration bar which extends through the molding part to the downstream end of the molding part and, as is known per se, a compressed air passage for supplying compressed air therein. And a cooling passage for cooling the liquid. Performing the method with an injection head with a nozzle requires relatively expensive and complicated adjustment work, and a calibration device that projects a long distance downstream has a molding part formed by the nipping part of the corrugator. Must be aligned exactly within. Equipment with vertical corrugators is not suitable for manufacturing corrugated tubes with a small nominal width. This is because, in such a vertical configuration, the work of adjusting and calibrating the molding portion having a small diameter cannot be practically performed.

In practice, horizontally oriented corrugating shapers are commonly used in the manufacture of corrugated plastic tubes of small nominal width. Such a device and a method are known, for example, from DE-A 36 22 775. In this device, the hemorrhoid's hemorrhoid is placed horizontally, and the nozzle of the injection head engages far into the molding cavity. Therefore, in practice, producing a tube with a small nominal width requires a very long and narrow nozzle so as to form a uniform tube wall. A manufacturing drawback is, in addition to the adjustment problem, a high back pressure in the case of long, narrow nozzles, which significantly limits the exclusion. Furthermore, in this case, for example, by cooling a long nozzle,
There are complications in the manufacturing procedure and start-up phases after the material solidifies in the equipment. Further, there is a possibility that the structure of the nozzle and the profile of the molding pinching portion may be damaged by an apparatus that is not properly adjusted during manufacturing. As the nominal width of the corrugated tube becomes smaller,
These problems are exacerbated. On the one hand, the required manufacturing and operational reliability of the very thin nozzles faces the limits of technical feasibility, and on the other hand, the pressure at evacuation cannot be reduced in the desired way.

German Patent Publication No. 1 504 701 discloses a device of different construction of plastic tubing. This device uses a fixedly arranged calibration means, and a sampling means is connected downstream of the calibration means. The molding cavity is provided in the form of a rigid hollow body within the fixed calibration means. This device can only be used to produce tubes of constant cross section over the length, i.e. not corrugated tubes. Extraction means connected downstream of the calibration means withdraws the flexible tube emerging from the annular gap of the nozzle from the molding cavity of the calibration means. Therefore, it is possible to operate with nozzles that do not engage the molding cavity and generally use one and the same nozzle for the circular annular gap in relation to various calibration means with different cross-sectional shapes of the molding cavity. However, internal pressure should not be exerted on the inside of the flexible tube that emerges from the annular gap and is still plastically deformable. If an internal pressure is created and acting, the tube emerging from the annular gap may expand before passing through the molding cavity, impinging on the inlet opening of the calibration means and being stuck there. The device known from DE-A-1 504 701 therefore requires a separate withdrawal means connected downstream of the molding cavity to ensure reliable operation and the tube is unaffected by the internal pressure.

It is an object of the invention to provide an apparatus and a method for producing corrugated plastic tubing, in particular so that corrugated plastic tubing with a small nominal width can be implemented simply and practically with low equipment cost.

With regard to the device, this object is achieved by the subject matter of claim 1, and with respect to the method, this object is achieved by the subject matter of claim 16.

The present invention provides for the injection head as long as the annular gap is located at a distance from or directly adjacent to the inflow end of the molding cavity formed by the nip of the corrugator. It is provided that the nozzle means is arranged outside the molding cavity.
This means that the injection head does not have to engage the annular gap in the molding cavity. Therefore, the ejection head or its nozzle means may be relatively short in the axial direction. The vertical orientation of the injection head, unlike the traditional horizontal orientation of the injection head and corrugators, means that gravity does not have an unwanted effect and create an irregular wall thickness. Furthermore, it is possible to operate with relatively low external pressure reduction or internal pressure increase. Placing this nozzle outside the molding cavity, using a relatively short nozzle, not only has advantages for adjustment and setting work, but it also provides a high level of operational reliability and can significantly increase emissions. it can. These relatively short nozzles have relatively low pressure drop and thus can be operated at very high production rates. Thus, emissions can be significantly increased, perhaps within the cooling capacity limits of the corrugator.

The method of the present invention is based on the fact that the jet diameter of the jetted molten plastic material, preferably the jet inner diameter and / or the jet outer diameter, sets the distance from the annular gap of the molding cavity to the inlet end. It can be performed as determined and / or adjusted. The spacing of the annular gap with respect to the inflow end of the molding cavity represents a manufacturing parameter that depends on the diameter of the plastic tube produced and the plastic material used.

The method of the present invention provides for the molten plastic material at the time when the jet diameter of the emerging molten plastic material, preferably the inner diameter of the jet and / or the outer diameter of the jet emerges from the annular gap relative to the production rate of the corrugator. It can also be carried out as determined and / or adjusted by adjusting the ratio of the inflow velocities of the jets.
If the production speed of the corrugated shaper is set to be higher than the speed at which the jet of molten plastic material appears in the annular gap, depending on the set distance between the annular gap of the molding cavity and the inlet end, It is possible for the jet of elastic molten plastic material, emerging from the gap and of tubular configuration, to be deliberately narrow in nature until it enters the molding cavity.

A particularly significant reduction in the undesired pressure drop in the nozzle, and thus a particularly significant increase in the discharge volume, is that the outer diameter of the annular gap is above the nominal width of the plastic tube produced, preferably It is possible if it is the effective inner diameter and / or outer diameter of the plastic tube produced. The effective inner diameter in the case of a corrugated tube is the internal free diameter in the region of the structure of the corrugated configuration, and in the case of a tube with more than one wall, the inner diameter of the inner tube. Although it can be designed with or without corrugations, when producing a tube with a constricted or expanded configuration at one or more locations on the extent of the molding cavity, the outer diameter of the annular gap is the plastic produced. It can be defined to be greater than or equal to the minimum inner diameter and / or the maximum inner diameter and / or the minimum outer diameter and / or the maximum outer diameter of the tube.

With respect to the dimensions of the molding cavity or corrugator, the outer diameter of the annular gap can be defined to be greater than or equal to the minimum inner diameter and / or the maximum inner diameter of the molding cavity.

Unlike the present invention, for the known and conventional manner of operation and construction, the outer diameter of the nozzle must always be smaller than the diameter of the tube to be manufactured. This is because the nozzles individually engage in the molding cavities and in this case have to be arranged within the inner diameter range of the individual tubes to be manufactured. In comparison, the present invention allows the use of larger outer diameter nozzles to produce tubes of the same or smaller nominal width. This advantage is particularly relevant when producing tubes with a nominal width of 6 mm or less. The arrangement of the annular gap outside the molding cavity means that it is also possible to manufacture specially shaped tubes. For example, tubes having a particular cross-sectional geometry can be manufactured. It is possible to manufacture tubes with angular, eg square, rectangular, triangular or oval cross-sectional shapes, rather than the traditional circular cross-sectional shape. In this case, the molding cavities are defined as corresponding configurations in cross section. The annular gaps or nozzles respectively located outside the molding cavities may each have a conventional circular cross section. This means that tubes with these special cross sections can be manufactured using nozzles of conventional design.

When the annular gap is located outside the molding cavity, with or without corrugations,
It is also possible to produce tubes of different cross-sections in the region of the molding cavity at one or more points, for example at a certain point having a constriction or widening or at least partly a conical configuration. Therefore, the outer diameter of the annular gap or nozzle must be chosen to be greater than or equal to the diameter of the narrowest cross-sectional location in order to be located outside the molding cavity. Corresponding points also apply to the production of tubes which are partially curved or inclined or are displaced laterally with respect to the axis of the injection head or the axis of the annular gap. These special shapes can also be produced by the fact that the annular gap is preferably located outside the molding cavity using conventional nozzles. In this regard, the molding cavity can be defined as a complementary configuration that accommodates the particular shape of the tube being manufactured.

When manufacturing tubes of conventional cross-sectional shape, a corrugator of conventional construction can be used to form the molding cavity. Such corrugators are preferably deformed only slightly. When manufacturing a specially shaped tube, a corrugated shaper with an appropriately modified configuration of the molding cavity can be used. However, an essential point of all design configurations is to position the corrugator in the operating position with the molding part with the molding cavity oriented vertically. For example, it is possible to use a corrugator having a moving corrugator clamp that is stepped in sequence by a suitably driven pivot arm or is driven in a circular motion like an endless belt. it can. In this case, the injection head is in a position vertically downward in each case, and more specifically, the annular gap is formed between the upper edge of the moving path of the molding nipping portion and the molding cavity formed by the molding nipping portion. Used to be placed between the inflow end or on the upper edge of the path of travel of the molding nip. When using an injection head with a downstream end of tubular configuration, the tubular end extends axially within the injection head, or axially into the injection head, is tubular in cross-section and has a passage leading to an annular gap. Can be defined as engaging axially within the molding cavity over a length substantially less than the axial extent of, for example half the length.

In order to be able to adjust the position of the molding cavity or corrugator with respect to the injection head, the position of the molding cavity or corrugator is preferably vertical and / or horizontal without changing the position of the injection head. It is preferably displaceable.

A special effect is obtained by displacing the position of the molding cavity with respect to the injection head and, depending on the melting resistance of the elastic plastic material, the extension of the extrudate so that it does not get jammed between the molding nips. And the subsequent contraction can be clearly controlled.

A special effect is obtained when the molding cavity or corrugator is pivoted about a horizontal axis. The corrugator can be pivoted from its vertical operating position to a horizontal blocking or holding position. The molding gripper can be easily adjusted or replaced in its horizontal position. In addition, cleaning and setting operations can be performed at that location on the molding nip and other parts of the overall corrugator.

In a particular embodiment, the injection head and / or the extruder, preferably the extruder and the injection head, are displaceable with respect to the corrugator when in the operating position. For example, a particular advantage to the start-up phase is obtained if the extruder is preferably pivotable about a vertical axis or if the extruder is displaceable. Thus, in the start-up phase of operation, the extruder and injection head are placed in a relationship in which the injection head does not point into the molding cavity but is laterally displaced with respect to the corrugator, resulting in a jet of molten plastic material. It can be defined to move to a lateral position that does not pass through the corrugator.

In order to guarantee a high level of manufacturing quality, a vacuum and / or a boost is created,
As a result, pressure forming means can be associated with the molding cavity for pressing the mass of plastic material of the jet of molten plastic material passing through the molding cavity against the inner wall surface of the molding cavity.

A preferred embodiment of the injection head is that the injection head has an inner member, for example in the form of a supporting air tube, a molding core and / or a cooling bar, which inner member is supported on the injection head and Extending to the downstream end of the injection head and forming an annular gap with the inner wall of the injection head. In this case, the inner member extends at its downstream end over a part parallel to the inner wall of the nozzle, forming a discharge passage of tubular cross section. In this case, the discharge end of the inner member can be defined as terminating in the region of the annular gap or extending from the annular gap. Regarding the placement of the injection head with respect to the molding cavity, the end of the inner member projecting from the annular gap either projects more or less into the molding cavity, or terminates directly at the inflow end of the molding cavity, or inside the molding cavity. It can be provided that it does not project into the cavity and terminates at a distance to the inflow end of the molding cavity, in which case the annular gap is preferably arranged outside the molding cavity. In all of these configurations, it is possible to actually carry out the adjustment and setting work and the good handling in carrying out the work with an appropriate level of operational reliability, with a correspondingly high production rate and good production. Quality can be achieved.

Other details, features and advantages will be apparent from the following description of an embodiment, schematically illustrated in the drawing, of an apparatus according to the invention for carrying out a method according to the invention for producing corrugated plastic tubes. Will be.

Detailed Description of the Preferred Embodiments For an apparatus for manufacturing corrugated plastic tubing, various views in an operative position are shown in FIGS. 1, 2 and 3. The device 1 comprises extrusion means 2 arranged in a stage above a support frame structure 3. The extruding means 2 has the extruder 4 horizontally arranged in the upper stage of the support frame structure 3 as described above in the axial range. In a variant embodiment, the extruder may be arranged in a vertically oriented position.

The extruder 4 has a funnel-shaped hopper 5 on the intake side and a discharge connection 6 on the discharge side. The ejection head 7 is connected to the ejection connection 6. In this case, the injection head 7 is arranged outside the support frame structure 3 and extends vertically downward. A corrugator 8, which is also oriented vertically, is arranged adjacent to and below the injection head 7. The corrugator 8 is mounted on a slider or carriage 10 which is displaceably supported on vertical columns 9 of the support frame structure 3. The lower end of the corrugator 8 is provided with a discharge opening in which the finished corrugated plastic tube appears. At the lower stage of the support frame structure 3, a direction changing roll 11 is supported, and the direction changing roll 1 is
1, the corrugated plastic tube emerging from the discharge opening of the corrugator 8 is deflected and withdrawn towards the left in FIG. The corrugated plastic tube is then rolled onto a storage roll (not shown).

The waveform shaper 8 is vertically displaceably mounted on the column 9 by the carriage 10. The carriage 10 is motor-driven by the driving means 13 supported on the support column 9. The drive means 13 has a drive motor 14 which drives a vertically oriented spindle 15 which is supported on the columns. This motor means causes the carriage to be vertically displaced to position and adjust the corrugator 8.

The device of the present invention further comprises pivoting means 16 capable of pivoting the corrugator 8 about a horizontal axis. The pivot shaft 20 is supported so that one end is on the carriage 10 and the other end is in the housing of the corrugator 8. The actuation of the pivot means is carried out by a hand lever 17 connected to the pivot shaft 20 and guided in the arcuate guide means 17a. The corrugator 8 can be pivoted by the pivoting means 16 to the inoperative position shown in FIG. This position of the corrugator 8 facilitates maintenance and repair work.

As is known per se, the corrugator 8 comprises a vacuum means 18 with individual adjustable vacuum zones, by means of which the vacuum means 18 are arranged in the corrugator (see FIGS. 4 and 5). A reduced pressure is generated on the inner wall of the molding cavity 35, and the plastic material of the molten plastic material flow is pressed against the inner wall of the molding cavity. The energy supply is performed by the energy supply band 19 connected to the lower end of the waveform shaper 8.

The waveform shaper 8 is designed in a known manner. Molded cavity 35 with circular cross section
As can be seen from FIGS. 4 and 5, the pair is formed by a pair of corrugated sandwiching portions arranged one above the other. The sandwiches 36, 37, which correspond to each other as a pair, are in the form of semi-circular sections in cross section and extend around the inner cavity representing the molding cavity 35.
The clamps 36 and 37 are simultaneously guided in two endless loops which are guided in a circular movement in a vertical plane. In relation to this, it is arranged on the left of FIG.
The loop formed by 6 is guided in the clockwise direction, and the loop on the right side formed by the sandwiching portion 37 is guided in the counterclockwise direction. This movement is caused by the motor drive 39. In the vertical portion where the sandwiching portions 36 and 37 of the corrugating device are vertically guided linearly in a facing relationship with each other, the sandwiching portions 36 and 37 corresponding to each other as a pair contact so as to seal the molding cavity 35. . The upper inflow end of the molding cavity 35 is
It is formed by the upper radial inner edges of the clamps 36, 37 that have recently been individually moved to the contact position at that time. 4 and 5, the edge of the upper inlet end of the molding cavity is designated by the reference numeral 40.

The injection head 7 shown in FIGS. 4 and 5 comprises a substantially cubic or parallelepiped main head body 71 and nozzle means 72 connected to this body. Extending from the main head body 71 is an arcuate supply passage 73 which is open at the end of the body 71 on the right side in the drawing and which is open at the lower end of the body 71. The nozzle means 72 is provided in the supply passage 7
3 is connected to the outlet opening facing downward. The nozzle means comprises an upper nozzle body 74 in which there is a central passage 75 which points vertically downwards and which is aligned with the outlet opening of the supply passage 74. The passage 75 is narrowed downward. Also, the passage 75 is slightly enlarged at its discharge end. A nozzle body 76 composed of a plurality of parts is connected to this region. A passage 77 having an annular cross section and opening toward the inside is provided inside the composite nozzle body. The passage 77 is formed between an inner body 78 that is tapered downwardly in a conical shape and an outer body 79 that is also tapered and has an annular cross section. The nozzle tip 80 is
Screw onto the tapered lower end of the outer body 79. The end of the inner body 78 has a circular passage 7
7 further narrows and extends into the nozzle tip 80. An annular passage 70 that forms a downstream nozzle discharge port is provided at the lower discharge opening of the nozzle tip 80. Also,
Inside the composite body 76, there is an annular gap 70 that extends through the inner body 78 and extends to the center.
A central passage 81 is provided which is open to the outside at the same height as. The supporting air is supplied into the central passage 81 by means of a radial connecting passage 82 having a connecting portion 83 arranged on the outside.

A multi-piece heating sleeve 85 is attached to the outer wall of the composite body forming the nozzle means 72. The sleeve 85 has an electrical connection 86. Heat detectors 87 for temperature measurement are mounted in suitable bores in the composite nozzle body at multiple locations of the nozzle means, which bores are arranged sequentially in the direction of flow. In the central passage 75 engages a differential pressure measuring means 88 mounted in a suitable radial bore in the nozzle housing 74.

The nozzle means 72 has a relatively short axial length as compared to the conventionally used nozzle means. This is possible because the injection head with the nozzle means 72 is oriented vertically downwards, so that the corrugator 8 is formed by the molding cavity 35 oriented vertically in the axial direction. The jet of molten plastic material ejecting from the annular gap 70 is annular in cross-section and is radially pressed against the inner wall of the molding cavity by the reduced pressure acting on the jet from the outside in the inner wall region of the molding cavity. In this situation, gravity acts uniformly on the jet. In contrast, the nozzle is oriented horizontally,
In the conventional mode of operation in which the corrugators are arranged horizontally, gravity acts to cause an irregular deflection of the jet of molten material passing through the corrugators.

The nozzle means 72 is a vertically downward, conically converging end portion of the downstream end of the corrugated shaper 8, which has an annular gap 70 at its free end. More specifically, the corrugator clamps 36, 37, which correspond to each other in pairs, engage in the areas where they do not yet reach the mating position forming the molding cavity. Figure 4
And as shown in FIG. 5, the annular gap 70 is located at a location away from the inflow end of the molding cavity 35, ie above the end boundary edge 40 of the molding cavity. However, as can be seen in FIGS. 4 and 5, in this connection, the tapered downstream portion of the nozzle means 72 engages between the shaped nips 36, 37 which are not yet closed.
In this state, the annular gap 70 is between the upper boundary edge 40 of the molding cavity and the upper edge 41 of the movement path of the molding nips 36, 37 guided by the circular movement.
Therefore, the nozzle end with the annular gap 70 does not extend axially into the molding cavity over a certain minimum length, as in normal operating procedures for corrugators. In the conventional procedure, where the corrugator is placed in a position that is oriented horizontally during operation, it is substantially longer and has a downstream tapered nozzle end with an annular gap located at the nozzle end. Nozzle means are used.

The pushing means 2 together with the injection head 7 connected to the connecting part 6 can pivot about a vertical pivot axis 21 as shown in FIG. Therefore, the pushing means 2 is shown in FIG.
Can be placed in the pivoting position shown in FIG. 1, in which the injection head 7, which is still vertically oriented, is not axially aligned with the corrugator 8, unlike the normal operating position. This position is used, for example, as the starting phase of the operation of the extrusion means. It is only after the start-up phase has ended that the pushing means pivots into the normal operating position shown in FIG. 3 and is locked in its position by the restraining lever 22 (FIG. 1) for operation.

In a typical operation for producing corrugated plastic tubing, the device of the invention operates as follows.

The plastic material supplied by the funnel hopper 5 is squeezed in the extruder 4 towards the left in FIG. 1 and is pushed through the connection 6 in the direction of the arrow 25 into the injection head 7. At the downstream end, the injection head 7 has nozzle means 72 with an annular gap 70 from which molten plastic material is ejected in the form of a jet of molten plasticsic material having a circular cross section. , Facing down substantially vertically. Thus, the jet of annular molten plastic material passes through the vertically oriented axial molding cavity 35 of the corrugator 8, which is formed by the corrugations 36, 37 of the corrugator. Due to the reduced pressure obtained at the inner wall of the molding cavity 35, the material of the incoming molten plastic material stream is pressed against the inner wall of the molding cavity 35. The manufacturing speed of the corrugating device 8, that is, the speed at which the sandwiching portions 36, 37 of the corrugating device 8 vertically move downward to form a molding cavity, is higher than the speed at which the jet of molten plastic material is discharged in the annular gap 70. Due to the high speed, a constriction is formed in the annular extrudate towards the entrance end into the molding cavity 35. The finished corrugated plastic tube appears at the lower end of the corrugator 8 through the discharge opening. The finished corrugated plastic tube bypasses around the diverting roller 11 and is withdrawn into a storage station (not shown) in the lower stage of the support frame structure 3.

[Brief description of drawings]

[Figure 1]   Schematic front view of one embodiment of an apparatus for manufacturing corrugated plastic tubing

[Fig. 2]   Side view taken along the arrow II in Figure 1.

[Figure 3]   Top view taken along arrow III in Figure 1

4 is a cross-sectional view showing a part of the area of the injection head taken along the section line IV-IV in FIG. 3 or the section A parallel to the plane of FIG. 1;

FIG. 5 is an enlarged view of FIG. 4 in the region of the downstream end of the injection head and the upper inlet region of the corrugating device.

FIG. 6 is a plan view corresponding to FIG. 3 showing the pushing means with the firing head pivoting about a vertical axis in the inoperative position;

FIG. 7 is a side view corresponding to FIG. 2 showing the corrugator pivoting about a horizontal axis in the inoperative position.

[Procedure amendment]

[Submission date] May 14, 2002 (2002.5.14)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Contents of correction]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Contents of correction]

With regard to the device, this object is achieved according to the subject matter of claim 1, and with respect to the method, this object is achieved according to the subject matter of claim 13 .

─────────────────────────────────────────────────── ─── Continued front page    (81) Designated countries EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, I T, LU, MC, NL, PT, SE), CA, JP, U S

Claims (30)

[Claims] 1. An apparatus for producing plastic pipes, preferably corrugated plastic pipes, having a nominal width of less than 10 mm, comprising at least one extruding means (2) and in the production direction said extruding means (2). At least one injection head (7) connected downstream, oriented vertically in the operating position and having at least one annular gap (70), connected downstream of said injection head (7) in the manufacturing direction, and operating Position vertically,
The moving clamping unit (36, 37), for example, the clamping unit (36, 37) of the corrugating device.
And a molding cavity (35) forming the plastic tube from a jet of at least one molten plastic material ejected from the annular gap (70) of the injection head (7), the annular gap (70) ) Is located at a distance from the inflow end (40) of the molding cavity (35) or directly adjacent to the inflow end (40),
The device, characterized in that it is arranged outside the molding cavity (35). 2. The outer diameter of the annular gap (70) is greater than or equal to the nominal width of the plastic tube produced, preferably the effective inner diameter and / or outer diameter of the plastic tube. Equipment. 3. The outer diameter of the annular gap (70) is greater than or equal to the minimum inner diameter and / or the maximum outer diameter and / or the minimum outer diameter and / or the maximum outer diameter of the plastic tube to be manufactured. The device according to claim 1 or 2. 4. The outer diameter of the annular gap (70) is equal to the molding cavity (35).
) Or more of the minimum inner diameter and / or the maximum inner diameter.
The apparatus according to claim 1. 5. A molding clamp (36, 37) oriented vertically in the operating position and forming said molding cavity (35), along which said corrugating mold (8) of said corrugating mold (8). Moving vertically only in the axial direction, and when moving vertically, completely sealing the molding cavity (35) in the radial direction,
A corrugating shaper (8) that moves radially relative to each other outside of each other and in turn moves in a stepwise or cyclic manner to move preferably vertically and axially in a vertical plane; The gap (70) is the upper edge of the movement path of the molding sandwiching portion (36, 37) (
41) and the inflow end portion (40) of the molding cavity (35) or on the upper edge (41) of the movement path of the molding clamping portion (36, 37). The device according to any one of claims 1 to 4. 6. The molding cavity (35), preferably the corrugating shaper (
Device according to any one of claims 1 to 5, characterized in that the whole of 8) and the injection head (7) are adjustable vertically and / or horizontally with respect to each other. 7. The molding cavity (35), preferably the corrugator ().
7. Device according to claim 6, characterized in that the position of 8) is preferably vertically and / or horizontally displaceable for adjustment purposes. 8. The molding cavity (35), preferably the corrugator (35).
8. Device according to claim 1, wherein 8) is pivotable about a horizontal axis, preferably in a rest position and / or a holding position, preferably in a horizontal position. 9. The injection head (7) and / or the extrusion means (2),
Preferably said extrusion means (2) and said injection head (7) are in their operating position with respect to said molding cavity (35), preferably with respect to said corrugator (8), preferably during the starting phase of operation. 9. The device according to claim 1, wherein the device is displaceable for 10. Device according to claim 9, characterized in that said pushing means (2) are pivotable about a vertical axis (21). 11. The injection head (7) comprises an inner member (78), for example in the form of a support air tube, a molding core and / or a cooling bar, the inner member (78).
Is supported by the injection head (7) portion, extends to the downstream end of the injection head (7), and forms the annular gap (70) with the inner wall of the injection head (7) in the first half. The device according to any one of claims 1 to 10. 12. The inner member (78) extends on a portion parallel to the inner wall of the injection head (7) at the downstream end forming the discharge passage (70) of annular cross section. The device according to claim 11. 13. The annular gap (wherein the downstream end of the inner member (78) is
Device according to claim 11 or 12, characterized in that it terminates in 70) or projects from the annular gap. 14. The inner member (78) protruding from the annular gap (70).
Said end of said mold protruding into said molding cavity (35) or directly terminating at said inlet end (40) of said molding cavity, or not protruding into said molding cavity (35), 14. The apparatus of claim 13, wherein the apparatus terminates at a distance from the inlet end of the molding cavity. 15. The mold cavity (35) produces a reduced pressure and / or an increased pressure, which results in a mass of plastic material of a jet of molten plastic material passing through the mold cavity (35). A pressure generating means (18) for pressing against the inner wall of the molding cavity (35) is connected.
15. The apparatus according to any one of [14] to [14]. 16. A method for producing a plastic tube, preferably a corrugated plastic tube, having a nominal width of less than 10 mm, wherein a mass of plastic material is connected downstream of said extrusion means by an extrusion means (2). Formed by a moving clamping jaw, for example a corrugating jaw (36, 37), in the form of a jet of molten plastic material from the annular gap (70) of the injection head (7) which is oriented vertically in the operating position. And the material of the jet of molten plastic material is fed into the molding cavity (35), which comes into contact with the inside during molding by external depressurization and / or internal boosting,
The molding cavity (35) when the annular gap (70) is located at a distance from the inflow end (40) of the molding cavity (35) or directly adjacent to the inflow end (40). ) Is located outside the method. 17. The jet diameter of the jetted molten plastic material, preferably the jet inner diameter and / or the jet outer diameter, is such that the annular gap (70) with respect to the inlet end (40) of the molding cavity (35). 17. Method according to claim 16, characterized in that it is determined and / or adjusted by adjusting the interval of 18. The jet diameter of the jetted molten plastic material, preferably the jet inner diameter and / or the jet outer diameter, is determined by the relative displacement of the annular gap (70) and the molding cavity (35). 18. Method according to claim 16 or 17, characterized in that it is and / or adjusted. 19. Method according to claim 18, characterized in that the relative displacement is effected by a vertical displacement, preferably an adjustment, of the molding cavity (35), preferably of the corrugating shaper (8). 20. The jet diameter of the jetted plastic material, preferably the jet inner diameter and / or the jet outer diameter, is the inflow velocity of the jet of molten plastic material jetted from the annular gap (70) and the corrugation. The determination and / or the adjustment is made by adjusting the relationship of the vessel (8) with the production rate.
The method according to any one of 6 to 19. 21. The manufacturing speed of the corrugator (8) is the vertical speed of the nips (36, 37) of the corrugator and / or the molding cavity (35) of the corrugator (8). 21. The method of claim 20, wherein the method is determined and / or adjusted by adjusting pressure conditions within. 22. The annular gap (70) preferably is the injection head (7).
) The outer diameter is an annular gap (70) that is greater than or equal to the nominal width of the plastic tube produced, preferably the effective inner diameter and / or outer diameter of the plastic tube produced. 22. The method according to any one of claims 16-21. 23. The annular gap (70) is preferably the injection head (7).
22. The outer diameter formed in the nozzle part of 1) is equal to or larger than the minimum inner diameter and / or the maximum inner diameter and / or the minimum outer diameter and / or the maximum outer diameter of the plastic pipe to be manufactured. The method according to any one of 1. 24. The annular gap (70) is preferably the injection head (7).
) Is formed in the nozzle part, and the outer diameter is equal to or larger than the minimum inner diameter and / or the maximum inner diameter of the molding cavity (35).
Method described in section. 25. Using a corrugator (8) oriented vertically in the operating position,
The molding sandwiching parts (36, 37) of the corrugating machine (8) move only along the molding cavity (35) vertically in the axial direction, and in this situation, the molding cavity (36).
35) completely sealed in the radial direction and moved radially relative to each other outside said molding cavity (35), preferably in a vertical plane with respect to each other by a gradual or cyclical movement relative to each other. Moving in the radial direction and the axial direction, the annular gap (70) and the upper edge (41) of the moving path of the molding sandwiching portion (36, 37),
22. Arranged between the molding cavity (35) and the inflow end (40) or on the upper edge of the path of movement of the molding pinch (36, 37). The method according to any one of 1. 26. An inner member (78) of the injection head (7), which functions, for example, as a support air tube, a molding core and / or a cooling bar, is supported in particular on the injection head (7) and the injection head ( A method according to any one of claims 16 to 25, characterized in that it extends to the downstream end of (7) and forms the annular gap (70) with the inner wall of the injection head (7). 27. The injection member (7) at the downstream end of the inner member.
27. A method as claimed in claim 26, characterized in that it is guided on a part parallel to the inner wall of the duct and forms a discharge passage (27) of annular cross section. 28. The downstream end of the inner member (78) has the annular gap (70).
28. A method according to claim 26 or 27, characterized in that it terminates in the region of, or projects from the annular gap. 29. The inner member (78) projecting from the annular gap (70).
The end of the mold cavity projects into the molding cavity (35) or terminates directly at the inflow end (40) of the molding cavity, or is located outside the molding cavity (35), The inlet end (40) of the molding cavity (35)
29.) A method according to claim 28, characterized in that it terminates at an interval with respect to. 30. A reduced or increased pressure is created in the molding cavity (35) such that a material of the jet of molten plastic material is transferred to the molding cavity (35).
30. Method according to any one of claims 16 to 29, characterized in that pressure generating means (18) for pressing against the inner wall of () are associated.