EP1901905A1 - Verfahren zur herstellung von kunststoffformteilen und danach hergestelltes formteil - Google Patents
Verfahren zur herstellung von kunststoffformteilen und danach hergestelltes formteilInfo
- Publication number
- EP1901905A1 EP1901905A1 EP06761713A EP06761713A EP1901905A1 EP 1901905 A1 EP1901905 A1 EP 1901905A1 EP 06761713 A EP06761713 A EP 06761713A EP 06761713 A EP06761713 A EP 06761713A EP 1901905 A1 EP1901905 A1 EP 1901905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plastic
- moulded
- injection molding
- production
- viscosity
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000004033 plastic Substances 0.000 title claims abstract description 11
- 229920003023 plastic Polymers 0.000 title claims abstract description 11
- 238000001746 injection moulding Methods 0.000 claims abstract description 22
- 239000008187 granular material Substances 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 9
- 238000010137 moulding (plastic) Methods 0.000 claims description 12
- 239000004952 Polyamide Substances 0.000 claims description 9
- 229920002647 polyamide Polymers 0.000 claims description 9
- 239000007858 starting material Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000000137 annealing Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 15
- 238000007493 shaping process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229920006097 Ultramide® Polymers 0.000 description 1
- 229920003567 Ultramid® A4H Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 that is Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/021—Heat treatment of powders
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/48—Polymers modified by chemical after-treatment
-
- 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
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/21—Circular sheet or circular blank
- Y10T428/211—Gear
Definitions
- the invention relates to a process for the production of plastic moldings while increasing the viscosity number of the starting material used for their preparation. It relates in particular to the production of such parts in an injection molding process. Furthermore, the invention relates to a molded part produced by the process.
- the plastic in order to enable the use of the injection molding technique, the plastic must not have too high a viscosity, since otherwise only a machining process would be possible.
- the load capacity and thus the life of moldings made of plastic directly proportional to the viscosity number of the material related.
- the gradient of the proportionality line is so steep that a change in the viscosity number by only 15 points halves or doubles the service life, for example of a toothed ring made of plastic.
- plastic moldings such as sprockets and the like
- materials are generally used today, preferably polyamides, which have an absolute viscosity or solution viscosity of 180 ml / g to 190 ml / g when they are delivered.
- the viscosity number decreases by up to 5 points. Accordingly, the load capacity or service life of a molded part produced by injection molding from plastic reduces.
- the supplying chemical industry is also able to deliver higher viscosity materials, that is, plastics having a higher viscosity number.
- the production of corresponding materials is preferably done by changing the extrusion conditions and generally leads to an increase in the price of the starting material for injection molding.
- the viscosity number of polyamide By heating or tempering of the granules serving as starting material for the injection molding process, according to a predetermined temperature-time profile, the viscosity number of polyamide can be increased.
- the increase in the viscosity number apparently results from the fact that, due to a polycondensation reaction occurring due to the heat, molecules are crosslinked with one another, so that longer chains are formed. With longer chains, however, the intermolecular forces become larger, so that as a result the load capacity of the material, in the form of the modulus of elasticity and in particular the fatigue strength, increases.
- the illustrated type of pretreatment of the granules is much more efficient than a thermal aftertreatment of the finished part.
- the benefit of the invention is therefore that higher loadable by the producer of the plastic moldings according to the requirements of the customer with the same starting material Parts can be realized.
- a new field of application of this material opens up for applications for which high-priced materials are used today.
- a molded plastic article produced by the process according to the invention has, after shaping, a solution viscosity with a viscosity number between 180 ml / g and 200 ml / g. It is characterized in particular by the fact that its solution viscosity is equal to or greater than the original solution viscosity of the granules used for its production.
- rotating or dynamically loaded parts such as sliding elements, gears or shafts, having a viscosity number between 180 ml / g and 200 ml / g
- corresponding viscosity numbers can be achieved with starting materials which have a viscosity number on delivery of between 180 ml / g and 190 ml / g.
- the reduction in the viscosity number occurring during injection molding is therefore at least compensated or, as is clear from the above figures, optionally also overcompensated.
- worm gears or helical gears for use in the transmission of a power steering can be produced, which despite the use of a rather low-cost polyamide having the above-mentioned viscosity number of 180 ml / g to 190 ml / g after the completion of the molding process, a viscosity number between 180 ml / g and 200 ml / g.
- worm gears or helical gears Ultramid ® A4H be manufactured by heating the starting material to HO 0 C and is then annealed for 12 hours. Thereafter, the worm wheels are produced in an ordinary manner in an injection molding process from the pretreated granules according to the invention. It can be seen that, without resorting to higher-priced materials which have a higher viscosity number than the generally obtained for the purpose of injection molding of the manufacturers of such moldings, worm gears or helical gears can be made for the stated purpose, which viscosity numbers between 180 ml / g and 200 ml / g. Obviously due to this relatively high viscosity number, corresponding worm gears or helical gears have a high load capacity and stability, by which they are suitable for use in EPS applications.
- EPS electric power steering systems
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Gears, Cams (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005033186A DE102005033186A1 (de) | 2005-07-13 | 2005-07-13 | Verfahren zur Herstellung von Kunststoffrormteilen und danach hergestelltes Formteil |
| PCT/DE2006/001105 WO2007006251A1 (de) | 2005-07-13 | 2006-06-27 | Verfahren zur herstellung von kunststoffformteilen und danach hergestelltes formteil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1901905A1 true EP1901905A1 (de) | 2008-03-26 |
Family
ID=37390901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06761713A Withdrawn EP1901905A1 (de) | 2005-07-13 | 2006-06-27 | Verfahren zur herstellung von kunststoffformteilen und danach hergestelltes formteil |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100098899A1 (de) |
| EP (1) | EP1901905A1 (de) |
| JP (1) | JP2009500206A (de) |
| DE (1) | DE102005033186A1 (de) |
| WO (1) | WO2007006251A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111144044B (zh) * | 2019-12-16 | 2024-07-09 | 重庆大学 | 一种考虑温度影响的塑料齿轮接触疲劳寿命评估方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB845711A (en) * | 1956-02-02 | 1960-08-24 | Inventa Ag | Process for the treatment of granular polyamide materials with gaseous agents |
| DE1015596B (de) * | 1956-10-11 | 1957-09-12 | Basf Ag | Verfahren zur Ausbildung fuer den Spritzguss guenstiger Eigenschaften an koernigem Polyamid |
| US4891420A (en) * | 1988-06-30 | 1990-01-02 | Basf Aktiengesellschaft | Continuous process for the hydrolytic production of polycaprolactam by tempering unextracted granular polymer material with moist inert gas |
| WO1993005097A1 (en) * | 1991-09-03 | 1993-03-18 | Allied-Signal Inc. | A process for controlling the melt viscosity of polyamides during melt processing |
| AU2867900A (en) * | 1999-02-05 | 2000-08-25 | Advanced Polymer Technology, Inc. | Methods of treating polymeric materials, methods of forming nylon, and apparatuses |
| DE10037030A1 (de) * | 2000-07-27 | 2002-02-07 | Basf Ag | Verfahren zur Herstellung von Polyamiden |
| EP1308255A1 (de) * | 2001-10-30 | 2003-05-07 | Dsm N.V. | Verfahren zum Herstellen eines geformten Teils aus Polyethylen mit ultrahochmolekularem Gewicht und durch dieses Verfahren hergestellte Faser |
-
2005
- 2005-07-13 DE DE102005033186A patent/DE102005033186A1/de not_active Withdrawn
-
2006
- 2006-06-27 WO PCT/DE2006/001105 patent/WO2007006251A1/de not_active Ceased
- 2006-06-27 US US11/995,250 patent/US20100098899A1/en not_active Abandoned
- 2006-06-27 JP JP2008520704A patent/JP2009500206A/ja not_active Withdrawn
- 2006-06-27 EP EP06761713A patent/EP1901905A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007006251A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009500206A (ja) | 2009-01-08 |
| WO2007006251A1 (de) | 2007-01-18 |
| DE102005033186A1 (de) | 2007-01-18 |
| US20100098899A1 (en) | 2010-04-22 |
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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: 20071213 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BURGSTALER, ANDREE Inventor name: BEUTLER, OLAF |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RBV | Designated contracting states (corrected) |
Designated state(s): DE ES FR GB IT |
|
| 17Q | First examination report despatched |
Effective date: 20091014 |
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| 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: 20091231 |