DE2101443A1 - Multi-headed extruder - Google Patents

Description

Herne, 1000 Munich $ 2,

Freiligrothitraße 19 ■ »! ■» IS -.- «Il ""BmU Elsenacher Straße 17

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Telephone: 51013 r W. 398012

⁵¹⁰¹⁴ Dipl.-Ing. W. Herrmann-Trentepohl ^{3? 8} ° "

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Munich

Saint-Gobain, b'2, vol. Victor Hugo, 92 Neuilly-sur-Seine France

Multi-headed extruder.

The invention relates to extruders with several heads, such as those used for the manufacture of plastic tubes in the manufacture of plastic tubes Find use.

In such extruders, the center distance between two extruder nozzles must be correspond exactly to the center distance of the molds with which they interact. The center distances of the impression forms are, either because the impression forms are fixed to one another or because one impression form has two or more impressions, fixed, but can change from one series of items to be produced to the other series. It is therefore desirable to have the same multiple extrusion heads To be able to use forms whose imprints have changing center distances from one series to the next.

It is known that the nozzle of each extruder head is in its position to make so movable and adjustable with respect to their dome that one obtains a tube whose wall thickness is complete

109830/1782 _ ₂ _

is uniform. This adjustability of the nozzle with respect to of the corresponding mandrel is particularly desirable in extruders in which the axis of the extruder heads is perpendicular to that of the extruder screw 3teh (extrusion at the angle head).

Such an adjustment is made by simply bringing the nozzle out of the center with respect to its mandrel in such a way that the the tube exiting the nozzle is itself eccentric with respect to the mandrel, d. H. with respect to the axis of the extruder head. It follows that the once between the heads of an extruder is matched to the center distance between the impression forms The selected center distance does not correspond to the center distance of the extruded pipes, which is important for the quality of these Tubes to be manufactured items is known to be disadvantageous.

The invention aims to eliminate these difficulties by making the center distance of the extruder nozzles variable and on makes the center distance of the impression forms with which these nozzles interact adaptable.

For this purpose, according to the invention, each is a 3-extruder head about a geometric coinciding substantially with the axis of the feed channel for the plastic from the extruder Axis mounted rotatably in such a way that by pivoting these extruder heads about this geometric axis, the center distance the Düae can be adapted to the center distance of the impression forms that interact with them.

In a preferred embodiment according to the invention Each extruder head is carried by an intermediate piece that is attached to the extruder by means of a union nut or a A similar, rigid or integral part connected to the extruder is mounted against the union nut supports a shoulder and in this union nut with respect to the axis of the supply channel for the plastic from Extruder is pivotable under the influence of an adjusting device.

109830/1782 -3-

- ^? "210U43

In a further embodiment of the invention, the adjusting device advantageously has adjusting screws for each extruder head which engage in internal threads in rigid parts fixed to the head and abut against a fixed component come.

Each extruder head preferably contains two in the opposite one Sense acting adjusting screws, both on the fixed part in the direction of the geometric axis of the extruder head act.

The drawing shows an embodiment in

Fig. 1 is a schematic view of an extruder according to the invention and in

Fig. 2 is a partial sectional view along the line II-II of Fig. 1.

In the following description, the following reference symbols are used to designate certain parts:

1 extruder head

2 nozzle

3 plastic pipe 5a game

4 channel

5 channel

6 part

7 intermediate piece 7a shoulder

8 union nut

9 adjusting screw 10 adjusting screw

12 fixed part

13 contra-angle.

In the drawing, 1 denotes in each case an extruder head with a vertical axis, which has a nozzle 2 at the lower end,

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from which a plastic tube 3 emerges. The one put under pressure by a horizontal mixing screw (not shown) Plastic enters the extruder heads 1 through a channel 4, which divides into two channels 5 with a fixed center distance χ.

As already described, the nozzles 2 with respect to the Bring the axes of the extruder heads 1 off center, which results in an eccentricity of the extruded plastic pipe 3 Has.

To compensate for this eccentricity is according to the invention each extruder head 1 is mounted pivotably with respect to the part 6 of the extruder in which the channels 4 »5 are provided.

For this purpose, each extruder head 1 is mounted on the part 6 by means of an intermediate piece 7, e.g. B. screwed, which is held in place in front of the opening of the corresponding channel 5 by a union nut 8 which is screwed onto the part 6. The intermediate piece 7 has a shoulder 7a which is so strong that a play 3a remains in the union nut 6. The intermediate pieces 7 can rotate in the union nuts 8 under the influence of the adjusting screws 9 and 10, which both grip a fixed part 12 in opposite directions and are screwed into the internal threads of angle pieces 13 seated on the upper part of the extruder heads.

So by operating the adjusting screw 9 and 10 of each extruder head 1, you can these extruder heads 1 in the Pivot the same vertical plane about an axis 0 corresponding to the axis of the channel 5. The position of each extruder head 1 can thus be set as desired by placing the corresponding extruder head 1 in a vertical plane pivoted by a certain angle. The extreme positions 00 ^ and 00p of the axes of each extruder head 1 are in Pig. 1 indicated by dash-dotted lines. These positions correspond to extreme values x. and Xp of the center distance of the nozzles 2.

Thus, if the axes of the extruded plastic tubes 3

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S 210U43

are displaced as a result of the displacement of the nozzles 2, d. H. if the center distance of these tubes does not exactly correspond to the fixed center distance χ and thus the center distance of the impression forms, one can use the device according to the invention by actuating the adjusting screws 9 and 10, which are seated on the extruder heads Swivel intermediate pieces 7 in the union nuts d and thus the center distance of the extruded tubes 3 exactly to the value d ^ s Set the center distance fcs of the impression forms. Ls is further possible to adjust the position of each extruder head 1 independently, which, if necessary, makes different corrections to each extruded tube 3 possible.

In addition, the adjustability of the center distance between the extreme values x., and x “the adaptation of the same Double-head extruder arrangement on Eormen, the imprints of which have an axial eccentricity between x. and x can have ^.

-Patent claims:

-6- 109830/1782 ÄAD

Claims (4)

210H43 claims 1.) Extruder with several heads, characterized in that each Sxtruderkopf (1) around a substantially with the axis of the feed channel (4) for the plastic from the extruder coincident geometric axis is rotatably mounted in such a way that by pivoting these extruder heads (1) The center distance (x) of the nozzles (2) around this geometric axis to the center distance of the interacting with them Imprint shapes is customizable. 2. Extruder according to claim 1, characterized in that each extruder head (1) is carried by an intermediate piece (7) which is on the extruder by means of a union nut (8) or a similar rigid or integral part connected to the extruder is mounted against the union nut (8) supported by a shoulder (7a) and in this union nut (d) with respect to the axis of the supply channel (5) for the plastic from the extruder under the influence of an adjusting device (9, 10) is pivotable. 3. Extruder according to claim 2, characterized that the adjusting device for each extruder head (1) has adjusting screws (9, 10) which are fixed in internal thread with the head (1) grip rigid parts (13) and come into abutment against a fixed component (12). 4. Extruder according to claim 3 »characterized that each Sxtruderkopf (1) two adjusting screws acting in opposite directions (9 »10), both on the fixed part (12) in the direction of the geometric axis of the The extruder head (1) act.