FR2633555A1 - PLANT FOR THE EXTRUSION OF A MULTI-LAYERED RIB OF THERMOPLASTIFIED MATERIALS - Google Patents

Abstract

In this installation, the inlet block 4 has inlet channels 7 and the co-extrusion block 5 has a coating channel 8 as well as control channels 9 opening into the coating channel 8 and provided with elements control unit 10 for the various mass flows of the thermoplastic material. The outlet die 6 produced in the form of a single channel die is connected to the coating channel 8. Between the inlet block 4 and the co-extrusion block 5 is installed an interchangeable distribution block 12 which forms part a set of building elements consisting of a plurality of interchangeable distribution blocks. Each distribution block 12 has input channels 13 corresponding to the input channels 7 as well as distribution channels 14 corresponding to the control channels 9 which, from one distribution block to the other, are connected differently to the channels input 13 and cause different beds in the strand 1.

Description

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  The invention relates to an installation for

  the extrusion of a multilayer rod of thermoplastic materials-

  tified, comprising an extruder and at least one co-

  extruder, an inlet block, a co-extrusion block and an outlet die, the inlet block having inlet channels and the coextrusion block, a coating channel as well as control channels opening into the coating channel and provided with control elements for the various mass flows of the thermoplastic material and the outlet die produced in the form of a single channel die being connected to the coating channel. In the context of the invention, the term “strand” designates profiled strands in the form of solid profiles and hollow profiles, including tubes, but also panels

  and leaves. In the sleeping channel the super

  position of the different mass flows in a flow system

  Lement multilayer which is shaped in the outlet die in a multilayer rod of thermoplastic material

and extruded in the form of a rod.

  In the installation well known in practice and which constitutes the starting point of the invention, the block

  inlet is directly connected to the co-extrusion block.

  So are defined in the multilayer flow system

  and in the multilayer rod an order and a predefined number-

  finished layers. The installation as a whole is designed for this order of layers. A modification of

  the order of the layers requires major transformation work.

  mation and acceptance of inconvenient downtime.

  The object of the invention is to improve an installation of the aforementioned type in such a way that the order of the layers and the number of layers in the outgoing tube can be modified in a simple manner and without lengths.

bothersome downtime.

  According to the invention, this object is achieved by the fact that between the inlet block and the co-extrusion block is installed an interchangeable distribution block which is part of a set of construction elements consisting of a a plurality of interchangeable distribution blocks, and that each distribution block has input channels

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  corresponding to the input channels as well as distribution channels corresponding to the control channels which, from one distribution block to the other, are connected differently to the input channels and cause different sleeping arrangements in the tube. The notion "different beds" includes

  both different layer orders and thick-

different layer sisters.

  In a preferred embodiment of the invention: the distribution blocks are mounted so

  interchangeable in a distribution block casing.

  It goes without saying that, to avoid thermal disturbances, the replacement distribution blocks can be reheated before installation in the installation according to the invention and respectively in the block casing

of distribution.

  The distribution blocks can in turn consist of several plates provided with bores forming channels. In particular, the arrangement can be

  chosen so that inside the distribution blocks

  bution some plates are interchangeable, which makes it possible to assemble distribution blocks having variable distribution channels. They can be replaced individually or in groups, for example also

  in pairs. With this conformation of the distribution blocks

  tion, some plates can also be part of all distribution blocks and be used,

  as the case may be, for several distribution blocks.

  The following description, with reference to the

  sins appended by way of nonlimiting examples, will make it possible to understand clearly how the invention can be put into practice. Figure 1 shows, in perspective, a diagram

  of an installation according to the invention.

  FIG. 2a, b and c represent a set of construction elements with different distribution blocks for

the installation of figure 1.

  Figure 3a, b, c, d and e shows an exploded view of a distribution block assembled from

several plates.

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  The installation shown in Figure 1 is used

  at the extrusion of a multilayer rod 1 of thermo-materials

  plasticized. It basically comprises an extruder 2 and at least one co-extruder 3, an inlet block 4, a co-extrusion block 5 and an outlet die 6. The inlet block 4 comprises inlet channels 7. The co-extrusion block 5 is equipped with a coating channel 8 as well as control channels 9 opening into the channel

  sleeping 8 and provided with control elements 10 for different

  different mass flows of the thermoplastic material. The outlet channel 6 is connected to the coating channel 8

  which is produced in the form of a single channel die.

  In the exemplary embodiment, it is connected by

  via a corner connection element 11.

  Between input block 4 and co-block

  Extrusion 5 is installed a distribution block 12. It is mounted interchangeably. The distribution block

  12 is part of a set of construction elements

  killed by a plurality of interchanging distribution blocks

  geables according to Figures 2a, 2b and 2c. Each block of

  distribution 12 includes corresponding input channels 13

  to input channels 7 as well as distribution channels

  bution 14 corresponding to the control channels 9 which are connected differently to the input channels 13 and cause

  different beds in the tube 1.

  As regards the object of FIG. 1, it may be an installation for the manufacture by

  co-extrusion of multilayer plastic sheets.

  The distribution block 12 of FIG. 2a is inserted in

  a casing of distribution blocks 15. But it is also

  It is also possible to install the other distribution blocks 12 in Figures 2b and 2c. In the embodiment, we

  works with an extruder 2 and two co-extruders 3.

  The sausage 1 is a sheet of plastic material with five layers. For clarity, its layers are shown in Figure 1 with an exaggerated thickness. Note that the distribution block of FIG. 2a comprises three input channels 13 and five distribution channels 14. The co-extrusion block 5 comprises five control channels 9, four of which are equipped with control elements 10 under the form of drawers. It appears from FIG. 2b that the distribution block 12 comprises only two inlet channels 13 and three distribution channels 14 so that its installation in the installation according to the invention does not allow

  extrusion only from a roll 1 to three layers only.

  In this case, only one of the co-extruders 3 operates or is connected. The distribution block 12 of FIG. 2c corresponds to that of FIG. 2a, but with the difference

  that the order of the layers is reversed. The distribution blocks

  tion 12 are interchangeable. In Figure 2a, it is

  indicated that the distribution blocks 12 can be as-

pretended from plates 16.

  Details of the assembly of a distribution block

  bution 12 from several plates 16 are indicated in FIG. 3a, b, c, d and e. The plates 16 can be superimposed to form a distribution block 12,

  for example introduced into a suitable casing not shown

  smelled. It is also possible to pair them with

  other plates to form another distribution block.

Claims (5)

  A1. Installation for the extrusion of a multilayer rod of thermoplastic materials, comprising an extruder and at least one coextruder, an inlet block, a co-extrusion block and an outlet die, the inlet block having channels inlet and coextrusion block, a coating channel as well as control channels opening into the coating channel and provided with control elements for the various mass flows of the thermoplastic material, and the output die produced in the form of a single channel die being connected to the coating channel, characterized in that between the inlet block (4) and the block. co-extrusion   (5) an interchangeable distribution block (12) is installed   which distribution block (12) is part of a set of construction elements made up of a plurality of interchangeable distribution blocks (12), and that each distribution block (12) has inlet channels (13) corresponding to the input channels (7) as well as distribution channels (14) corresponding to the control channels   (9) which from distribution block (12) to distribution block   tion (12), are connected differently to the input channels   and cause different beds in the tube (1).   2. Installation according to claim 1, character-   laughed at by the fact that the distribution blocks (12) are interchangeably mounted in a block casing distribution (15).   3. Installation according to one of claims   1 or 2, characterized in that the distribution blocks   tion (12) consist of several plates (16) provided bores forming channels.   4. Installation according to claim 3, character-   laughed at by the fact that inside the distribution blocks   tion (12) certain plates (16) are interchangeable, which makes it possible to assemble distribution blocks (12)   with varying distribution channels.   5. Installation according to one of claims 3   or 4, characterized by. causes some plates (16)   can be part of all the distribution blocks (12).