DE102007047726A1 - Extrusion device for extruding molten synthetic material, has heating insert comprising elongated base, where external dimensions of base is formed in such manner that base is inserted into opening in starting valve in form-fit manner - Google Patents

Abstract

The device has a heating insert (2) provided in a starting valve (1) of the device. The heating insert has an elongated base (3) which comprises an interior cavity (4) that is connected to a heating fluid pipework (7) over a supply connector (5) and a discharge connector (6). The external dimensions of the elongated base is formed in such a manner that the elongated base is inserted into an opening (8) in the starting valve in a form-fit manner. The heating insert is detachably clamped in the opening.

Description

The The invention relates to an extrusion device having at least one Heating insert in an element of the extrusion device for tempering the Area of the element and a corresponding heating element of a such. Elements of a corresponding extrusion device according to the preamble of Claim 1 or the preamble of Claim 9.

As a general rule have extrusion devices, which in particular plastic material melt fed from, for example, an extruder from a nozzle plate, Extrude, for controlling the melt flow in particular Startup before the actual start of the extrusion from the nozzle plate a so-called. Anfahrventil, which the melt flow to the nozzle plate if necessary, redirect. This is necessary because in particular when starting often still no melt material for Is available, which is a sufficient material quality which can offer extruded strands. Therefore, becomes more common Way at the start of this first part of the melt over deflected the start-up valve and not through the nozzle plate extruded.

at such extrusion devices is due to the relatively high melt temperatures of the material to be extruded needed also the elements of the extrusion device in contact with the melt especially during operation a correspondingly sufficient temperature, preferably in the range of the melt temperature, for example a clumping of the melt by solidified melt particles in the Elements which come in contact with the melt, possible to prevent. This is especially true for the range of the starting valve, but also generally for melt-leading Parts of the extrusion device, such as. B. melt pump, screen changer and / or adapter flanges.

Out the prior art is already known, for. B. the starting valve provided with holes in which electrically operated heating elements / heating cartridges inserted, which can be switched on if necessary, around the housing, in which the holes and in it the electrically heated heating elements / heating cartridges are located on suitable Bring temperatures. This previous arrangement of electric Although heated cartridges has the advantage that these cartridges flexibly connected or disconnected and z. B. in case of disturbances also the corresponding holes can be removable for replacement, however, these electrically heated cartridges make additional electrical cable laying on the device or on the element necessary, furthermore an extra electric power supply provided with sufficient dimensioning and in areas which are critical with regard to the material to be processed, exists in addition due to the electric current possibly also a certain explosion risk.

It Therefore, the object of the present invention, an extrusion device with at least one heating element in an element of such an extrusion device, in particular a start-up valve, or a corresponding heating insert to provide an element of such an extrusion device, which overcomes the disadvantages of the prior art, and in particular a flexible, structurally simple and thus also cost-effective temperature control, in particular of the element, z. As the Anfahrventils, the extrusion device to provide.

Especially If the construction according to the invention a replacement for the existing electrical heating inserts / heating cartridges provide, so that possibly even a conversion of existing Facilities may be possible.

Further According to the invention, the security, in particular with regard to possible explosion hazards, further increased become.

The Object of the present invention, solved according to the invention by an extrusion device with at least one heating insert in an element of the extrusion device with the features of Claim 1 or by a corresponding heating insert such Elements of a corresponding extrusion device with the features of claim 9th

preferred Embodiments of the invention are in the respective Subclaims defined.

The extrusion device according to the invention comprises at least one heating insert / immersion heater in an element of the extrusion device, e.g. B. a starting valve, on. The heating insert of the extrusion device according to the invention has an elongated base body which has an inner cavity which can be connected via an inflow connection and an outflow connection to a heating fluid piping of the extrusion device, particularly preferably to the heating fluid piping, which is also optionally provided in a liquid-tempered nozzle plate of the extrusion device , In this case, the base body of the at least one heating element on such outer dimensions, that it is positively inserted into a corresponding opening of the element. In particular, the extrusion device according to the invention be designed with the appropriate heating element so that the opening of the element is an opening of conventional dimensions, which could accommodate a conventional electrically heated heating cartridge of the prior art in a conventional manner, but then according to the invention by the appropriately designed heating element is replaceable.

Consequently According to the invention, a particularly flexible, structurally simple and cost-effective design of the Elements, especially straight z. B. the starting valve, the invention Extrusion device to be made, in particular by the special design of the invention Heating insert a replacement element as a replacement part for existing electric heating cartridges is provided, wherein the existing (heating) fluid circuit, in particular the fluid circuit, which also takes over the temperature control of the corresponding nozzle plate, can be used to control the temperature of the element, as he over corresponding connections with the corresponding heating insert can be connected according to the invention.

Around a particularly flexible and easily replaceable design of the to ensure extrusion device according to the invention The heating insert can be designed so that it is in the opening of the element is detachably clamped. This will also be a particularly reliable heat coupling between the inventively designed heating element and allows the element or the housing of the element and the flexibility further increased.

According to the invention, in the extrusion device, the Heizfluidverrohrung be associated with Heizfluidkanälen the nozzle plate of the extrusion device. Here, in particular, a design of Heizfluidkanälen conceivable, as well as from the utility model DE 20 2005 020 467.6 the applicant is known. As a result, a particularly efficient and simple connection of existing fluid piping with the heating medium through which the fluid flows can be made according to the invention.

Around a particularly effective temperature control of the extrusion device to allow with the element of the extrusion device can provide several corresponding heating inserts be. In particular, these heaters can each be connectable with the Heizfluidverrohrung.

The Heating inserts can either be in series one after the other be connected to each other or they can be parallel to each other be connectable with the Heizfluidverrohrung.

Especially the device according to the invention is flexible when the Heizfluidverrohrung outside the extrusion device is guided. However, it is also possible that the Heizfluidverrohrung wholly or at least partially within the extrusion device is guided, d. H. whole or partly within the housing of each element the extrusion device, for. Within the nozzle plate, from the nozzle plate to the starting valve, in the starting valve and / or in the extruder.

Around a particularly good heat transfer of liquid flowed through at least one heating element of the liquid on the heating element and then on to the element or the housing of the element can allow in the internal cavity additional heat transfer elements, prefers rib-shaped heat transfer elements, with a connection to the main body of the respective heating element be provided.

According to the invention the heating insert of the extrusion device, preferably the main body of the Heating insert, have such a length that it is complete passes through the opening. This is a special easy mountability and a particularly good heat transfer where.

The Element of the extrusion device may be special in terms of particular Flexibility preferred according to the invention be a melt-carrying part of the extrusion device, more preferably a start-up valve and / or more preferably a melt pump Screen changer and / or an adapter flange. According to the The invention is as an element especially to a starting valve or thought of a housing of a starting valve, since there thus a particularly useful during startup and at the same time flexibly exchangeable tempering device to avoid the above mentioned clumps inventively preferred can be provided.

Provided according to the invention is a heating element of an element of an extrusion device, which an elongated body having a Internal cavity has, via an inflow port and a drain port with a heating fluid piping of an extrusion device is connectable. The inflow port and the outflow port can each provided at a corresponding end of the heating insert However, they can also be together at one end of the heating insert be provided, and more preferably provided coaxially could be. The heating insert according to the invention has a Basic body with such external dimensions, that it is form-fitting in an opening of the element the extrusion device can be used.

Furthermore applies to the design of the invention Heating insert already the above in connection with the invention Design of an extrusion device with such a heating insert Said accordingly and vice versa.

Especially can in the inner cavity of the invention Heating insert additional heat transfer elements, preferably in rib form, with a connection to the main body be provided.

Around a particularly good heat transfer of fluid to the heating insert and to the corresponding element of the extrusion device, z. B. the starting valve or to the housing of the starting valve, To ensure the heating insert according to the invention may be preferred a base made of a metal or a metal alloy exhibit. Particularly preferred are metals or metal alloys, which a particularly high heat transfer coefficient to provide housing material of the element.

at the heating insert according to the invention can at least the base body consist of a material with such a thermal expansion coefficient, that in the state of operation at operating temperature, preferably at an operating temperature in the range of the temperature of the heating fluid, there is a stronger jamming in the opening as in the condition of no operation at a temperature below the operating temperature, preferably at ambient temperature. This is a particularly flexible Use and rapid interchangeability while optimizing Temperability achievable.

The Invention will be described below with reference to the attached figures, which show preferred embodiments of the invention, be explained in more detail by way of example. Show it:

1 a portion of an extrusion apparatus having a start-up valve and at least one heating element according to an embodiment of the present invention;

2 a partially cutaway view of a starting valve and a nozzle plate with heating inserts in the starting valve according to a preferred embodiment of the present invention;

3 a sectional view along the section AA in 2 ;

4 a heating insert according to a preferred embodiment of the invention in a sectional view; and

5 a section along the line BB of 4 ,

1 shows in a schematic, perspective view of a part of an extrusion device according to a preferred embodiment of the present invention with a start-up valve 1 as an element of the extrusion device and a nozzle plate 11 , Into the housing of the starting valve 1 are four heating inserts 2 shown, which according to the embodiment of the invention shown here completely through the corresponding openings 8th the starting valve 1 pass through, and wherein these heating inserts also from the corresponding openings 8th the starting valve 1 are removable. Between the openings 8th passing through the housing of the starting valve 1 go through and the other openings, in particular the melt channels, in the starting valve 1 the extrusion device according to the invention are no fluid connections in the housing. The heating inserts 2 each have an elongated body 3 on, wherein the respective inner cavity of this body via an inflow port 5 and a drain connection 6 with a Heizfluidverrohrung 7 is connectable. The main body 3 has according to the invention such external dimensions that it is positively in the respective opening 8th the starting valve 1 can be used. The heating fluid piping 7 stands with the Heizfluidkanälen the nozzle plate 11 the extrusion apparatus according to the invention in conjunction. The four in 1 shown heating inserts can instead of conventional electrically heated cartridge heaters in the respective openings 8th be used for the tempering according to the invention the fluid supply to the temperature of the other extrusion device, in particular the liquid-temperature nozzle plate 11 with, so that no additional electrical connections and power supplies with the above-described disadvantages according to the prior art are necessary.

2 shows a partially cutaway side view of a starting valve 1 and a nozzle plate attached thereto 11 according to a preferred embodiment of the extrusion device according to the invention with two in the corresponding openings 8th the starting valve 1 positively inserted according to the invention heaters 2 , The inflow of heating fluid to the heating inserts 2 it follows by direct connection of the inflow connection 5 this heating insert with the Heizfluidverrohrung 7 , which in turn with Heizfluidkanälen 10 the nozzle plate 11 communicates. The heating inserts 2 each have a drain connection 6 on, which in turn at the bottom of the nozzle plate with the local Heizfluidverrohrung 7 is connectable. The heating inserts 2 are detachable via the respective inflow connection 5 and the drain connection 6 with the Heizfluidverrohrung 7 connectable, so they each in the respective opening 8th of the Anfahrventils are used, preferably over the entire length can be used, or from this opening 8th are removable again. The direction of the actual melt stream runs in 2 by the starting valve from left to right, wherein by actuation of the actuator schematically shown in the upper part of the figure, the starting valve 1 can be adjusted so that the melt flow when starting the extrusion device according to the invention down in 2 can be derived represented.

3 shows a section AA 2 , It can be seen in particular that the respective Heizfluidkanäle 10 the nozzle plate 11 and also the hollow heating inserts 2 , which fluid can be flowed through, with the inner cavity 4 her elongated hollow body 3 , inserted in the respective opening 8th the starting valve 1 , have no fluid connection to the path of the melt to be extruded. It can also be seen that the basic body 3 of the respective heating insert positively in the respective opening 8th the starting valve 1 is used, so that a good heat transfer is ensured according to the invention.

4 shows a heating insert 2 according to a preferred embodiment of the invention in a sectional view.

The heating insert 2 according to 4 has an inflow connection 5 and a drain connection 6 on, with these connections to the inner cavity 4 of the heating insert 2 connect so that the heater insert with its internal cavity 4 can be flowed through by a heating fluid. The outer dimensions of the elongated body 3 of in 4 shown heating insert 2 are chosen so that this form-fitting in an opening 8th the starting valve 1 an extrusion device (not shown) can be used.

To improve the heat transfer from the heating fluid to the body 4 of the heating insert 2 are at least partially (so in 4 However, it is also possible a continuous design, which extends along the entire length or along substantially the entire length of the inner cavity 4 of the heating insert 2 extends) additional heat transfer elements 9 provided, which rib-like into the interior of the inner cavity 4 protrude and with the main body 3 keep in touch.

5 shows a section BB according to the 4 , In this case, the rib-like structure of the additional heat transfer elements is particularly good 9 , connected to the main body 3 of the heating insert, to see.

As a basic body 3 the heating insert according to the invention 2 For example, find a heat pipe with twisted inner ribs use, as it is known from the patent DE 100 38 624 C2 shows.

When Material of a heating insert according to the invention is for the main body of a metal or a metal alloy particularly preferred, with particular preference to such a metal or such a metal alloy is selected, which one possible good heat transfer from the heating fluid to the heating insert and / or from the heating insert to the starting valve or to the housing the starting valve of the extrusion device according to the invention allowed.

By the extrusion device according to the invention or the heating insert according to the invention may be a particularly more flexible, constructively simpler, less expensive and more flexible reliable replacement for existing electric heating cartridges during operation, In particular in the already existing openings with the existing dimensions without their change, provided become.

Although in the figures by way of example only embodiments of the invention in connection with a starting valve 1 are shown as a corresponding element of the extrusion device, as well as the elements of an extrusion device listed above can be provided according to the inventive design.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 202005020467 U [0013]
• - DE 10038624 C2 [0038]

Claims (12)

Extrusion device with at least one heating insert ( 2 ) in one element ( 1 ) of the extrusion device, characterized in that the heating insert ( 2 ) an elongated body ( 3 ) having an internal cavity ( 4 ), which via an inflow port ( 5 ) and a drain connection ( 6 ) with a Heizfluidverrohrung ( 7 ) is connectable, wherein the main body ( 3 ) has such external dimensions that it fits positively into an opening ( 8th ) of the element ( 1 ) can be used. Extrusion device according to claim 1, characterized in that the heating insert ( 2 ) in the opening ( 8th ) of the element ( 1 ) is releasably clamped. Extrusion device according to claim 1 or 2, characterized in that the heating fluid piping ( 7 ) with Heizfluidkanälen ( 10 ) a nozzle plate ( 11 ) of the extrusion device is in communication. Extrusion device according to one of claims 1 to 3, characterized in that several heating inserts ( 2 ) are provided, which in each case with the Heizfluidverrohrung ( 7 ) are connectable. Extrusion device according to one of claims 1 to 4, characterized in that the Heizfluidverrohrung ( 7 ) is guided outside the extrusion device. Extrusion device according to one of claims 1 to 5, characterized in that in the inner cavity ( 4 ) additional heat transfer elements ( 9 ) with a connection to the main body ( 3 ) are provided, wherein the heat transfer elements ( 9 ) are preferably formed as ribs. Extrusion device according to one of claims 1 to 6, characterized in that the heating insert ( 2 ), preferably the basic body ( 3 ) of the heating insert ( 2 ), has a length such that it passes completely through the opening ( 8th ) passes through. Extrusion device according to one of claims 1 to 7, characterized in that the element ( 1 ) is a melt-carrying part of the extrusion device, preferably a start-up valve and / or a melt pump, a screen changer and / or an adapter flange. Heating element of an element ( 1 ) of an extrusion device, characterized in that the heating insert ( 2 ) an elongated body ( 3 ) having an internal cavity ( 4 ), which via an inflow port ( 5 ) and a drain connection ( 6 ) with a Heizfluidverrohrung ( 7 ) of the extrusion device is connectable, wherein the main body ( 3 ) has such external dimensions that it fits positively into an opening ( 8th ) of the element ( 1 ) of the extrusion device can be used. Heating element according to claim 9, characterized in that in the inner cavity ( 4 ) additional heat transfer elements ( 9 ) with a connection to the main body ( 3 ) are provided, wherein the heat transfer elements ( 9 ) are preferably formed as ribs. Heating element according to claim 9 or 10, characterized in that at least the main body ( 3 ) consists of a metal or a metal alloy. Heating element according to one of claims 9 to 11, characterized in that at least the main body ( 3 ) consists of a material having such a coefficient of thermal expansion, that in the state of operation at operating temperature, preferably at an operating temperature in the range of the temperature of the heating fluid, a stronger jamming in the opening ( 8th ) is present as in the condition of no operation at a temperature below the operating temperature, preferably at ambient temperature.