EP0944463A1 - Method of shaping powdery, thermally unstable thermoplastic shaping compounds - Google Patents
Method of shaping powdery, thermally unstable thermoplastic shaping compoundsInfo
- Publication number
- EP0944463A1 EP0944463A1 EP97954859A EP97954859A EP0944463A1 EP 0944463 A1 EP0944463 A1 EP 0944463A1 EP 97954859 A EP97954859 A EP 97954859A EP 97954859 A EP97954859 A EP 97954859A EP 0944463 A1 EP0944463 A1 EP 0944463A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaping
- thermoplastic molding
- powdery
- thermally unstable
- compounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/16—Forging
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/001—Shaping in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/251—Particles, powder or granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
- B29K2105/255—Blocks or tablets
Definitions
- the invention relates to a method for shaping131-shaped, thermally unstable thermoplastic molding compositions, in particular for the production of semi-finished products or molded parts.
- thermoplastic molding compositions can be converted into a molten state by the application of heat, in which compression and shaping of the material can be carried out effectively using suitable technologies (e.g. compression molding, extrusion, injection molding).
- suitable technologies e.g. compression molding, extrusion, injection molding.
- stabilizers, plasticizers, etc. an increase in the resistance to thermal degradation can be achieved.
- it is often not possible to use these substances if there are high demands on the purity of the molding compounds (e.g. when used in medical technology or in the food industry).
- Solid-phase extrusion techniques are known for the molding of plastics in the solid state, in which a preform of defined dimensions is pressed through a conical nozzle at temperatures below the melting temperature (NE Weeks, S Mon, RS Porter Journal of Polymer Science, Polymer Physics 13 (1975) 2031 , YD Wang, T Yamamoto, M Cakmak ANTEC'96 S 1654-1665)
- the goal of solid-phase extrusion is the production of highly oriented structures with improved strength properties.
- a disadvantage of this in particular for thermally sensitive polymers is that the material in the molten material is used to produce the preform Condition is transferred.
- the invention has for its object to process powdery, thermally and also hydrolytically unstable thermoplastic molding compositions so that they can be further processed as semifinished products or represent usable moldings.
- the thermal degradation processes that take place in the processing of thermoplastic molding compositions are to be prevented, so that the semifinished products or moldings are prevented a high level of mechanical properties are characterized
- thermoplastic molding compounds can be, for example, preferred polyolefins, polyamides or polyesters
- thermally unstable polymers such as, for example, biodegradable polymers, in particular polylactides and polyhydroxyalkanoates, and copolymers thereof are used.
- the initially powdery starting material is precompressed to a preform in a first process step using hydrostatic pressure.This is done with the aim of minimizing thermal damage, preferably at room temperature, but it can also be carried out at elevated temperatures, but in any case well below the melting temperature.
- the pressure must be chosen so that the density of the preform reaches about 75 to 90% of the bulk density of the polymer material
- the pre-compressed preform is subjected to deviatoric stress in a second step, extrusion.
- deviatoric stress in a second step, extrusion.
- the mutual penetration of neighboring particles takes place as a result of molecular movement processes in the boundary layer, as well as the removal of existing micropores in the material.
- the desired geometry of the molded part or semifinished product is formed by means of targeted form constraint.
- the preform can be produced at room temperature
- flow processes under deviatoric stress must be carried out at elevated temperatures in the range between glass and melting temperature, preferably at temperatures from 0.8 to 0.95 T m [K], in order to ensure intensive penetration
- the load under deviatoric stress is expediently chosen depending on the type of polymer material and the forming temperature in such a way that forming ratios of 1, 5 -, ⁇ ⁇ 3 are achieved.
- the deformation is preferably carried out under continuously increasing stress .
- the powdery thermoplastic molding compound can also contain fillers and / or Reinforcing agents such as calcium phosphates are added.
- the molded parts and semi-finished products produced according to the invention are distinguished by a property level which is considerably improved in comparison to products of conventional processing technologies.
- a property level which is considerably improved in comparison to products of conventional processing technologies.
- strength, ductility and toughness they are clearly superior to products that have been processed in the melt state, but also hydrostatically pressed in the solid state and products that are solidified by sintering.
- PHB polyhydroxybutyrate
- the density of the material is increased to 1.25 g / cm 3 by extrusion. Associated with this are significant improvements in mechanical properties, in particular tensile strength and elongation at break. Molecular degradation processes cannot be demonstrated.
- Selected characteristic values of the semi-finished products manufactured according to different processes in Figure 1 document the superiority of the extrusion technology according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Materials For Medical Uses (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19637904 | 1996-09-18 | ||
DE1996137904 DE19637904A1 (en) | 1996-09-18 | 1996-09-18 | Process for shaping powdery, thermally unstable thermoplastic molding compounds |
PCT/DE1997/001969 WO1998012035A1 (en) | 1996-09-18 | 1997-09-05 | Method of shaping powdery, thermally unstable thermoplastic shaping compounds |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0944463A1 true EP0944463A1 (en) | 1999-09-29 |
Family
ID=7805916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97954859A Withdrawn EP0944463A1 (en) | 1996-09-18 | 1997-09-05 | Method of shaping powdery, thermally unstable thermoplastic shaping compounds |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0944463A1 (en) |
CA (1) | CA2267357A1 (en) |
DE (1) | DE19637904A1 (en) |
WO (1) | WO1998012035A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10054431B4 (en) * | 2000-10-26 | 2009-12-03 | Volkswagen Ag | Method for painting a plastic body part and tempering frame |
US9475217B2 (en) | 2013-01-31 | 2016-10-25 | Saudi Basic Industries Corporation | Process for making highly crystalline shaped part from pet or pen |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL6816523A (en) * | 1967-11-22 | 1969-05-27 | ||
US3662052A (en) * | 1969-05-28 | 1972-05-09 | Carborundum Co | Impact molding of oxybenzoyl polyesters |
US4323531A (en) * | 1971-03-01 | 1982-04-06 | The Dow Chemical Company | Process for forming a plastic article |
US4014965A (en) * | 1972-11-24 | 1977-03-29 | The Dow Chemical Company | Process for scrapless forming of plastic articles |
DE3002910A1 (en) * | 1980-01-28 | 1981-07-30 | Basf Ag, 6700 Ludwigshafen | METHOD FOR PRODUCING A MOLDED BODY FROM POWDER TO GRANULAR-SHAPED THERMOPLASTIC PLASTIC |
DE3611688A1 (en) * | 1986-04-08 | 1987-10-22 | Hansa Metallwerke Ag | METHOD AND DEVICE FOR PRODUCING A PLASTIC MOLDED BODY |
DE3611687A1 (en) * | 1986-04-08 | 1987-10-15 | Hansa Metallwerke Ag | METHOD FOR PRODUCING PLASTIC MOLDED BODIES |
FR2602454B3 (en) * | 1986-08-11 | 1989-05-05 | Medico Chirurgical Intern Off | PROCESS AND DEVICE FOR OBTAINING FORGED POLYMER PARTS, AND APPLICATION OF THE PARTS OBTAINED IN THE PREPARATION OF ORTHOPEDIC PROSTHESES |
DE4012851A1 (en) * | 1990-04-19 | 1991-10-24 | Gerhard Dr Ing Frey | High strength thermoplastic moulding - prepd. from e.g. weaker mouldings by heating, subjecting to repeated shaping and shearing, and e.g. compression moulding to final shape |
DE4308239C2 (en) * | 1992-12-08 | 2002-07-11 | Biomet Merck Deutschland Gmbh | Process for producing a shaped body for osteosynthesis |
US5529736A (en) * | 1994-08-10 | 1996-06-25 | Clemson University | Process of making a bone healing device |
EP0795336B1 (en) * | 1995-09-14 | 2003-06-11 | Takiron Co. Ltd. | Osteosynthetic material, composited implant material, and process for preparing the same |
-
1996
- 1996-09-18 DE DE1996137904 patent/DE19637904A1/en not_active Withdrawn
-
1997
- 1997-09-05 EP EP97954859A patent/EP0944463A1/en not_active Withdrawn
- 1997-09-05 WO PCT/DE1997/001969 patent/WO1998012035A1/en not_active Application Discontinuation
- 1997-09-05 CA CA002267357A patent/CA2267357A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9812035A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2267357A1 (en) | 1998-03-26 |
DE19637904A1 (en) | 1998-03-19 |
WO1998012035A1 (en) | 1998-03-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19990208 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR IT LI NL |
|
17Q | First examination report despatched |
Effective date: 19991208 |
|
RTI1 | Title (correction) |
Free format text: METHOD OF MANUFACTURE OF INTERMEDIATE PRODUCTS OF POLYHYDROXYBUTYRATE |
|
RTI1 | Title (correction) |
Free format text: METHOD OF MANUFACTURE OF INTERMEDIATE PRODUCTS OF POLYHYDROXYBUTYRATE |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20010403 |