AU655793B2 - Thermoplastic resin profile of cavitous structure-extrusion apparatus for obtaining and method of manufacture of a profile - Google Patents
Thermoplastic resin profile of cavitous structure-extrusion apparatus for obtaining and method of manufacture of a profile Download PDFInfo
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- AU655793B2 AU655793B2 AU10164/92A AU1016492A AU655793B2 AU 655793 B2 AU655793 B2 AU 655793B2 AU 10164/92 A AU10164/92 A AU 10164/92A AU 1016492 A AU1016492 A AU 1016492A AU 655793 B2 AU655793 B2 AU 655793B2
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- extrusion
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- flow
- ducts
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- 238000001125 extrusion Methods 0.000 title claims abstract description 43
- 229920005992 thermoplastic resin Polymers 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 title description 9
- 210000004027 cell Anatomy 0.000 claims description 15
- 210000003850 cellular structure Anatomy 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 23
- 239000012815 thermoplastic material Substances 0.000 description 10
- 210000003462 vein Anatomy 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- XMQFTWRPUQYINF-UHFFFAOYSA-N bensulfuron-methyl Chemical compound COC(=O)C1=CC=CC=C1CS(=O)(=O)NC(=O)NC1=NC(OC)=CC(OC)=N1 XMQFTWRPUQYINF-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/695—Flow dividers, e.g. breaker plates
- B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
- B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/695—Flow dividers, e.g. breaker plates
- B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
Abstract
The invention relates to a cavitied profiled structure made from thermoplastic resin, the cavities of which are disposed substantially perpendicularly to the axis of the structure. The structure is produced by means of an extrusion apparatus consisting of an extrusion head (1) and of an extrusion tool (2), the extrusion head being divided into three substantially superposed channels (3)(4)(5) which emerge substantially into the region of the three corresponding channels of the extrusion tool and, on the opposite side, are connected to the feed channel of at least one extruder, the two outer channels (3)(5) serving for the passage of the material constituting the external walls of the structure or of the tube and the intermediate channel (4) serving for the passage of the material for the manufacture of the walls of the cavities, the said apparatus being characterised in that each of the outer channels is separated from the intermediate channel by means of an additional channel (7)(8), ending up, at the output, in alignment with those of the other channels, and the input of which, outside the apparatus, is intended to be connected to a means for varying the pressure. The structure is obtained by creating an alternating pressure variation in the additional channels (7)(8). <IMAGE>
Description
1181 v P/00/011 281nso Rogulailon 3.2(2)
AUSTRALIA
Patents Act 1990 655793
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Application f umber: .Lodged: I I
S
0I
S
a. S Invention Title: THERMOPLASTIC RESIN PROFILE OF CAVITOUS STRUCTURE-EXTRUSION APPARATUS FOR OBTAINING AND METHOD OF MANUFACTURE OF A PROFILE *5* a 1555 r
S
The following statement is a full description of this invention, including the best method of performing it known to Us PROFILED SHAPE HAVING A CELLULAR STRUCTURE IN THERMOPLASTIC RESIN EXTRUSION APPARATUS FOR OBTAINING SAID SHAPE AND ITS MANUFACTURING PROCESS The present invention relates to a profiled shape having a cellular structure in a single section manufactured from thermoplastic resin. It is constituted by two external walls closely connected to each other by internal walls, forming the cellular structure, disposed substantially perpendicularly to the longitudinal axis of 5 the profiled shape.
More particularly, the present invention relates to a profiled shape having a cellular structure manufactured from thermoplastic resin and constituted by two external walls connected to each other by internal walls, separated from each other by air vacuums forming the cellular structure, characterized in that said cellular structure is disposed substantially perpendicularly to the longitudinal axis of the profiled shape.
~The present invention also relates to an extruder distribution head or extrusion head divided into three superimposed channels for the passage of a S thermoplastic resin or thermoplastic resins, with the intermediate channel serving as passage for the material forming the internal walls. This distribution head has at its outlet means for causing an alternate pressure variation for diverting the flow of material from the intermediate channel, sometimes towards the channel allowing passage of the flow of material forming the upper wall of the profiled shape, and sometimes towards the channel allowing passage of the flow of material forming the interior wall of the profiled shape.
According to the present invention, three thermoplastic resin parisons are initially extruded or co-extruded substantially parallel. Two external parisons, A4 intended to form upper and lower walls of the final cellular profiled shape frame 2 the third intermediate parison which is then diverted in the extrusion equipment in an alternate manner to come and attach itself successively to the upper wall and to the lower wall.
Even though the invention relates to any type of profiled shape, it applies in particular to tubes having a cellular structure such as previously defined.
The profiled shapes having a cellular structure, that is, those formed by two surfaces connected to each other by spaced internal walls leaving air vacuums, are known to replace, with substantially equivalent properties, the full profiled shapes which are heavy and cumbersome on account of the quantity of material necessary for the realization of a rigid and sturdy material. Presently, profiled shapes which are marketed having a cellular structure and made of thermoplastic resin, are constituted solely from two wall connected to each other by internal walls forming partitions and disposed longitudinally relative to the axis of the profiled shape. These longitudinal cellular profiled shapes having a circular or 6i;15 rectangular section r.spond to the lightening criterion. Nevertheless, and particularly in the case of tubes, these profiled shapes generate, in their cells 9 between the walls, parasitic flows of fluid which are remedied by special connections or by particular joining devices.
The profiled shapes according to the present invention enable, inter alia, correction of these disadvantages due to the fact that these cells are disposed transversally, thus sealed, and not longitudinally, this for identical properties amongst the materials.
The apparatus enabling manufacture of such profiled shapes is constituted by a heated and controlled extrusion head allowing the passage of three flows of thermoplastic material in a molten state. These flows of thermoplastic material originating from at least one supply extruder are disposed in a substantially superimposed manner.
Provided between these flows is a means of pressure variation such as an additional channel allowing circulation of air or gas or another vacuum intake, The apparatus is also constituted by the extrusion equipment in which the three flows converge and where the two external flows constitute, at the point of 4 3 convergence, the upper and lower surfaces of the finished profiled shape, while the intermediate flow is brought into contact alternately with each of the surfaces.
This contacting of the intermediate flow with the two surfaces enables creation not only of the cells, but also allows the spacing t-Vrween the upper and lower surfaces to be maintained until the final profiled sharg is cooled. Alternate contacting of the intermediate flow with the two other flows is caused by an alternate variation in pressure caused between the intermediate flow and the flow from the upper surface on the one hand, and the intermediate flow and the lower flow on the other hand. This alternate diversion of the intermediate flow may be caused by conveyance of air or gas or other suction in at least two attached channels disposed in the extrusion head extending into the die of the extruder and emerging at the point of convergence of the flows between the intermediate flow and the flow from the upper surface on the one hand, and the intermediate flow and the flow from the lower surface on the other hand.
15 The explanation provided by the attached figures enables better understanding of the apparatus and process of the invention and illustrates the manufactured profiled shapes.
Figure 1 illustrates the cross-section of apparatus which enables realization o a panel having a cellular structure, the walls of which connecting the upper and 20 lower surfaces of said panel are disposed substantially perpendicularly to the i longitudinal axis of this panel. The apparatus is constituted by two elements attached to each other by conventional means extrusion head and the extrusion equipment represented by extruder die The extrusion head is divided into three superimposed channels emerging approximately at the level of the three channels corresponding to the extruder die. Two channels and serving as the flow of the material constituting the upper and lower walls of the panel and intermediate channel serving as the flow of the material for manufacturing the internal ribs or the walls of the cells of the panel, can be connected upstream of supply channel if the apparatus is supplied by a single extruder.
However, it is not out of the question for each of the channels to be \A connected in a known manner individually to an extruder where the panel is constituted by three different materials anrid/or different coloration. Nor is it out of the question, in an equally known manner, for only two channels to be connected to the supply channel of an extruder, while the third channel abuts the supply channel of a second extruder in this case, two different thermoplastic resins can be used in the production of the panel.
Each of channels and serving the flow of the material constituting the upper and lower walls of the panel is separated from intermediate channel (4) by an additional panel connected to the exterior of the apparatus by a tube (11) enabling optional connection to any pressurization or depressurization system. These additional channels disposed between the other channels end in one ,of their ends approximately at the same outlet level as that of said other channels. The outlet thickness of channels and can be regulated 0:0 individually thanks to mobile blocks and (10) acting on the cross-section of the outlet nozzle of these channels by enabling them to more or less shut, for example by axial or radial displacement.
Cooling and definitive shaping can be ensured by means of a conventional calibrating device (14).
Figure 2 illustrates the cross-section of apparatus allowing realization of a tube having a cellular structure, of which the walls of the cells 'onnecting the T 20 upper and lower surfaces, or the external surface of the tube and the internal surface of the tube, are disposed substantially perpendicularly to the longitudinal axis of the tube. This figure represents the preferred aspect of the invention.
Understood by tube is any hollow body having a constant geometrical crosssection following a given direction, but not necessarily presenting a symmetry of revolution. The apparatus is constituted by two elements attached to each other by conventional means extrusion head and extrusion equipment itself comprising extruder die (2a) and perforating die The extrusion head is divided into three superimposed channels emerging approximately at the level of the three corresponding channels of the extruder die. Two channels and serving as flow of the material constituting the external and internal walls of the tube and intermediate channel serving as flow of the material for manufacturing internal ribs or the walls of the cells of the tube can be connected upstream of the three flow distributors to supply channel if the apparatus is supplied by a single extruder. However, it is not out of the question for each of the channels to be connected in a known manner individually to an extruder where the tube is constituted by three different materials and/or different coloration. Nor is it out of the question, in an equally known manner, for only two channels to be connected upstream of their flow distributors to the supply channel of an extruder, while the third flow distributor of the last channel is supplied by a second extruder in this case, the two different thermoplastic resins constituting the tube can be different. Each of channels and serving as the flow of the material constituting the internal and external walls of the tube is separated from intermediate channel by an additional annular channel connected to the exterior of the apparatus by a tube (11) enabling optional connection to any pressurization or depressurization system. These additional channels disposed o between the other channels end in one of their ends approximately at the same 15 outlet level as that of said other channels. The outlet thickness of channels and can be regulated individually thanks to mobile blocks and (10) acting on the cross-section of the outlet nozzle of these channels by enabling them to be more or less shut, for example by axial or radial displacement.
:The flow distributor in an extruder head is known in and of itself. It serves .9:o 20 to obtain a constant flow of material at the outlet of the equipment. The forms of distributor channels and can be a function of the thermoplastic materials used.
Figure 3 illustrates a cut-away section of a cellular tube obtained according to the present invention.
The profiled shapes having a cellular structure according to the present invention are obtained by extrusion or co-extrusion of at least one thermoplastic material. The thermoplastic material is sent in the apparatus from at least one extruder and the profiled shape Is recovered at the outlet of the extrusion equipment under the usual well-known conditions for extrusion or co-extrusion.
The characteristic of the process enabling realization of a profiled shape having a cellular structure, of which the internal walls of the cells are disposed substantially perpendicularly to the longitudinal axis of the profiled shape, resides essentially in the treatment of the flow of material intended for formation of the cell walls.
The process is characterized in that as long as the intermediate flow of material leaving the extrusion head is in a molten state between the flow of thermoplastic material intended to form the upper or external surface and the intermediate flow on the one hand, and the flow of thermoplastic intended to form the lower or internal surface and the intermediate flow on the other hand, a variation in pressure is caused in an alternate mariner so as to create an undulation substantially perpendicular to the axis of extrusion or co-extrusion of the thermoplastic material of the intermediate vein.
This undulation created by the aforementioned variation in pressure can be caused by example by alternate excess pressure or injection of a gas or air on both sides of the intermediate vein, by depression by creation of an alternate vacuum on both sides of this same vein, or again by a rate of flow of the 15 intermediate vein greater than that of the two others.
The significance of this alternate variation in pressure can either emphasize or not emphasize the angle of inclination of the cell walls. Likewise, the sequencing duration between each variation in pressure enables regulation of the volume of the cells. The significance of the variation in pressure depends on 20 numerous parameters, in particular the thicknes of the intermediate vein, the thermoplastic material used, the desired angle of inclination of the walls, the desired volume of the cells. As a function of all these considerations, the expert :skilled in the art can adapt the variation in pressure according to his objectives.
The only apparent conditions for the smooth running of the process are that the alternate variations in pressure are sufficient on the one hand for the intermediate flow to alternately come into cortact with the still molten material of the flows forming the two other walls of the profiled shape, and that on the other hand they are not so abrupt as to avoid deterioration of the intermediate flow, Contact of the intermediate vein or parison with the other veins or parisons can be ensured by a rate of flow of the intermediate flow greater than that of the flows forming the internal and external walls. This difference in flow rate brings with it contact of the material of the intermediate flow with that of a wall to which it is welded. The excess of material, due to the extrusion velocity of the intermediate flow, is extruded towards the other wall to which it is welded, and the phenomenon is reproduced in alternate manner. The variations in pressure can be controlled in this case, or let alone, and the movements of the intermediate wall aspirate th'a quantities of air or gas necessary to fill the cells. Yet it is preferable, in order to master the frequency and regulation of the cells, to control the variations in pressure during extrusion or co-extrusion.
For a clearer explanation, the process is described with reference to Figures 1 and 2, with due consideration that these figures illustrate an apparatus supplied by a single extruder, but knowing that the process is just as suitable when the apparatus is supplied by more than one extruder, following bypassing of at least one of channels The thermoplastic material originating from the extruder, not shown, is diffused into channels and of the apparatus which are supplied by :15 general supply channel connected to the extruder.
Afterwards, when leaving the warm equipment and in a general manner while the flow of material is in a molten state, undulations of intermediate flow (4) are created by alternate variation in pressure in zones (12) and (13) located between the flows at their point of convergence in the extrusion equipment. This :20 alternate variation in pressure in these zones is caused by excess pressure or reduced pressure in attached channels and connected to the outside, during advancement of the extrusion of the profiled shape. These external intakes can be connected to any means enabling creation in the apparatus of pressure and/or reduced pressure. In fact it is not out of the question to alternately create simultaneously pressure in one intermediate channel and reduced pressure in the other intermediate channel, in order to improve the formation of the walls of the cells.The external means for causing alternate pressures and/or reduced pressures in the apparatus are known for example, it may be a question of electromagnetic valves connected to a vacuum pump or to a compressor. As explained already, these external intakes can also be optionally left to the open air.
8 The thickness of the profiled shape is determined by the relative flow of the two external and internal walls given by the cooling devices of the thermoplastic material disposed at the outlet of the warm equipment. For example, a conventional internal cooling device can be disposed at the extremity of the perforating die to ensure constancy in the internal diameter of the tube. Cooling of the external wall of the profiled shapes can be ensured in general by a conventional refrigerated calibration device in extrusion.
The relative bringing together of the two external and internal walls enables modification of the form of the cell partitions, as shown in Figure 4, set* *06*9 **S ee •ti o *o
Claims (3)
1. Extrusion apparatus for tubes having a cellular structure, comprising an extrusion head and an extrusion tool consisting of an extruder die(2a)/perforating die (2b) assembly disposed longitudinally, said head (1) enclosing an external duct for the flow of a thermoplastic resin intended to form the external wall of the extruded tube, an intermediate duct for the flow of a thermoplastic resin intended to form the wall of the cells, and an internal duct for the flow of a thermoplastic resin intended to form the interral wall of the tube, these three ducts being substantially superposed in head (1) and emerging substantially at the level of three corresponding ducts of extrusion tool with external duct being separated from intermediate duct by a first additional duct internal duct being separated from the intermediate duct by a second additional duct each additional duct capable of being attached to a pressurising or derressurising system, said three corresponding ducts of extrusion tool torminating substantially in the same orthogonal plane longitudinally and characterised in that the three ducts *terminate inside extrusion tool enabling formation of the cells of the tube inside said tool
2. Apparatus as claimed in Claim 1, characterised in that said orthogonal plane is located between extrusion head and extruder die (2a)/perforating die (2b).
3. Apparatus as claimed in Claim 1 or 2, characterised in that the outlet S thickness of the ducts in extrusion tool corresponding to two external ducts and internal duct is adjusted by means of mobile shims (10) allowing extrusion tool of extrusion head to be moved away in the direction of the longitudinal axis. DATED this 31st day of October, 1994. ALPHACAN WATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD, THE GLASSHOUSE HAWTHORN VICTORIA 3122 AUSTRALIA 9 o00*0:
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9100228 | 1991-01-10 | ||
| FR9100228A FR2671511B1 (en) | 1991-01-10 | 1991-01-10 | PROFILE WITH ALVEOLAR STRUCTURE IN THERMOPLASTIC RESIN - EXTRUSION APPARATUS FOR OBTAINING THE PROFILE AND ITS MANUFACTURING METHOD. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1016492A AU1016492A (en) | 1993-02-04 |
| AU655793B2 true AU655793B2 (en) | 1995-01-12 |
Family
ID=9408570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU10164/92A Ceased AU655793B2 (en) | 1991-01-10 | 1992-01-10 | Thermoplastic resin profile of cavitous structure-extrusion apparatus for obtaining and method of manufacture of a profile |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0494566B1 (en) |
| JP (1) | JPH074847B2 (en) |
| KR (1) | KR100192018B1 (en) |
| CN (1) | CN1040079C (en) |
| AT (1) | ATE121345T1 (en) |
| AU (1) | AU655793B2 (en) |
| BR (1) | BR9200063A (en) |
| CA (1) | CA2059118C (en) |
| DE (1) | DE69109076T2 (en) |
| DK (1) | DK0494566T3 (en) |
| ES (1) | ES2071957T3 (en) |
| FR (1) | FR2671511B1 (en) |
| NO (1) | NO920120L (en) |
| PT (1) | PT100002B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387754A4 (en) | 2001-05-17 | 2007-12-05 | Entegris Inc | Manufactruing apparatus and method for multiple containment tubing |
| CN1329183C (en) * | 2003-12-30 | 2007-08-01 | 张瑞国 | Composite method of making honeycomb material by pipe |
| US8733405B2 (en) | 2005-03-14 | 2014-05-27 | Advanced Drainage Systems, Inc. | Corrugated pipe with outer layer |
| US7484535B2 (en) * | 2005-03-14 | 2009-02-03 | Advanced Drainage Systems, Inc. | Corrugated pipe with outer layer |
| CN102039654A (en) * | 2009-10-13 | 2011-05-04 | 甘国工 | Method and device for producing syntactic foam plate or section |
| CN104708791A (en) * | 2015-03-11 | 2015-06-17 | 江苏大道机电科技有限公司 | Head runner structure of large plastic blow molding machine |
| CN105479714B (en) * | 2015-12-23 | 2017-12-01 | 重庆天春科技有限公司 | A kind of method for preparing buffering combination board using air pressure support one-shot forming |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1486473A (en) * | 1966-05-18 | 1967-06-30 | Cellular material in thermoplastic material and its manufacturing process | |
| FR2142752A1 (en) * | 1971-06-24 | 1973-02-02 | Aquitaine Total Organico | Partially corrugated board mfr - by continuous extrusion of plastic material through a novel die |
| US4377545A (en) * | 1981-06-16 | 1983-03-22 | Borg-Warner Chemicals, Inc. | Method of making corrugated reinforced thermoplastic pipe |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5030958A (en) * | 1973-07-18 | 1975-03-27 | ||
| US4113814A (en) * | 1975-09-22 | 1978-09-12 | Sumitomo Chemical Company, Limited | Method for producing special pipes having longitudinally extending diaphragm partitions |
| AU571269B2 (en) * | 1983-11-10 | 1988-04-14 | Minnesota Mining And Manufacturing Company | Extruded article and method of making the same |
-
1991
- 1991-01-10 FR FR9100228A patent/FR2671511B1/en not_active Expired - Fee Related
- 1991-12-23 AT AT91403522T patent/ATE121345T1/en not_active IP Right Cessation
- 1991-12-23 DE DE69109076T patent/DE69109076T2/en not_active Expired - Fee Related
- 1991-12-23 EP EP91403522A patent/EP0494566B1/en not_active Expired - Lifetime
- 1991-12-23 DK DK91403522.5T patent/DK0494566T3/en active
- 1991-12-23 ES ES91403522T patent/ES2071957T3/en not_active Expired - Lifetime
-
1992
- 1992-01-09 PT PT100002A patent/PT100002B/en not_active IP Right Cessation
- 1992-01-09 CA CA002059118A patent/CA2059118C/en not_active Expired - Fee Related
- 1992-01-09 NO NO92920120A patent/NO920120L/en unknown
- 1992-01-10 AU AU10164/92A patent/AU655793B2/en not_active Ceased
- 1992-01-10 JP JP4021914A patent/JPH074847B2/en not_active Expired - Fee Related
- 1992-01-10 KR KR1019920000272A patent/KR100192018B1/en not_active IP Right Cessation
- 1992-01-10 CN CN92100624A patent/CN1040079C/en not_active Expired - Fee Related
- 1992-01-10 BR BR929200063A patent/BR9200063A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1486473A (en) * | 1966-05-18 | 1967-06-30 | Cellular material in thermoplastic material and its manufacturing process | |
| FR2142752A1 (en) * | 1971-06-24 | 1973-02-02 | Aquitaine Total Organico | Partially corrugated board mfr - by continuous extrusion of plastic material through a novel die |
| US4377545A (en) * | 1981-06-16 | 1983-03-22 | Borg-Warner Chemicals, Inc. | Method of making corrugated reinforced thermoplastic pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0494566A1 (en) | 1992-07-15 |
| KR100192018B1 (en) | 1999-06-15 |
| FR2671511A1 (en) | 1992-07-17 |
| CN1040079C (en) | 1998-10-07 |
| BR9200063A (en) | 1992-09-08 |
| AU1016492A (en) | 1993-02-04 |
| CN1063841A (en) | 1992-08-26 |
| JPH074847B2 (en) | 1995-01-25 |
| CA2059118A1 (en) | 1992-07-11 |
| DK0494566T3 (en) | 1995-07-17 |
| JPH0623823A (en) | 1994-02-01 |
| DE69109076T2 (en) | 1995-08-31 |
| PT100002A (en) | 1994-04-29 |
| NO920120D0 (en) | 1992-01-09 |
| KR920014594A (en) | 1992-08-25 |
| NO920120L (en) | 1992-07-13 |
| DE69109076D1 (en) | 1995-05-24 |
| ES2071957T3 (en) | 1995-07-01 |
| FR2671511B1 (en) | 1994-08-26 |
| ATE121345T1 (en) | 1995-05-15 |
| CA2059118C (en) | 1998-12-01 |
| PT100002B (en) | 1999-02-26 |
| EP0494566B1 (en) | 1995-04-19 |
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