WO2014131076A1 - A method of preparing a mould for injection molding - Google Patents
A method of preparing a mould for injection molding Download PDFInfo
- Publication number
- WO2014131076A1 WO2014131076A1 PCT/AU2014/000167 AU2014000167W WO2014131076A1 WO 2014131076 A1 WO2014131076 A1 WO 2014131076A1 AU 2014000167 W AU2014000167 W AU 2014000167W WO 2014131076 A1 WO2014131076 A1 WO 2014131076A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mould
- siloxanes
- silicone
- injection moulding
- chamber
- Prior art date
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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
- B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
- B29C33/64—Silicone
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/58—Applying the releasing agents
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/60—Deposition of organic layers from vapour phase
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
-
- 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
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
Definitions
- the present invention relates to methods of conducting injection moulding operations and to methods for preparing moulds for injection moulding.
- the invention has particular application in overmoulding operations using liquid silicone.
- Liquid silicone rubber materials are often used to manufacture articles with medical and food related applications.
- liquid silicone is provided in two parts, Part A and Part B. These are mixed and injected into a heated mould cavity. The heat of the mould vulcanises the silicone. The mould is opened and the silicone article is removed.
- an article is formed by firstly forming a first stage of the article from any material, such as plastic, steel or silicone. This first stage is then put into a second mould in which it is "overmoulded” with silicone. The silicone bonds to the first stage and vulcanises to yield a composite article formed partly from silicone and partly from the other material of the first stage.
- One technique which has been devised to address the problem of adhering of sticky silicone to mould parts involves setting up an injection moulding machine with a mould to be used for overmoulding, and initially running the machine with a regular silicone material for a period of time. Then, after a number of moulding cycles, which can be of the order of 1000 cycles, the machine is stopped and reconfigured to be supplied with a "sticky" silicone material. The articles produced during the initial running phase are treated as waste and are discarded. Moulding operations then proceed using sticky silicone and problems of the sticky silicone adhering to the mould are not experienced or at least reduced.
- the present invention provides a method of preparing a mould for injection moulding including the steps of: placing the mould in a chamber; creating an atmosphere in the chamber which includes vaporised siloxanes.
- the step of creating the atmosphere may include the steps of: introducing liquid siloxanes into the chamber; and applying heat to cause vaporisation of at least some of the liquid siloxanes.
- the siloxanes may include cyclosiloxanes.
- the siloxanes may include polydimethylcyclosiloxanes.
- the polydimethylcyclosiloxanes may include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane,
- the chamber may be provided in the form of a substantially gas tight vessel and the step of applying heat is carried out by placing the vessel in an oven.
- the present invention provides a method of conducting an injection moulding operation utilising an injection moulding machine and at least one injection mould including the steps of: preparing the mould by exposing surfaces of the mould to evaporated siloxanes prior to installing the mould in the injection moulding machine.
- Embodiments of the invention involve treatment of moulds prior to their installation and use with injection moulding machines.
- the treatments proposed give rise to a coating on the mould which has proven successful in addressing problems of adhesion of sticky type silicone materials during subsequent moulding operations.
- the shape for moulding is often defined by a so called "mould insert" which is removably mounted in the mould itself.
- a mould using mould inserts is refeixed to.
- the mould inserts of the mould are treated.
- mould inserts treated in the method above do not suffer from problems of adhesion of so-called "sticky” silicone. They are therefore able to be set up into an injection moulding machine which can be run from the outset using sticky silicone. The initial run in period using regular silicone is not required.
- Mould inserts treated by the methods above can be set aside and used at a later date and problems of adhesion still do not occur. This treatment can also be used on mould die blocks or any similar surface in contact with sticky silicone during moulding.
- siloxanes are the volatiles within uncured silicone that react to cause the curing of silicone. These volatiles diffuse from the core of the silicone to the surface, where it then evaporates. This process occurs both when it is uncured and when it is cured, until there are no more present.
- cyclic siloxanes concerned are known as D4 to D 10. Also known as unreacted cyclic oligomer starting materials, these are functional silicone volatiles that cause the silicone to cure. Cyclic siloxanes are used in the manufacture of silicone, as well as cosmetic and personal care products. They have a backbone of structure of alternating oxygen and silicon atoms, with hydrocarbon groups attached to the silicon side chain.
- Methods of the invention result in vaporisation of the siloxanes by various processes including a combination of boiling and evaporation. Higher temperatures results in higher volatisation of cyclic siloxanes, potentially increasing the rate of deposition of the coating. In order to maximise the release of the volatiles from a given amount of silicone, cured or uncured, it has been found to be beneiicial to maximise the ratio of exposed surface area to volume of silicone.
- the mould inserts and silicone products were put into an airtight aluminium box which was then itself put into an oven for heating.
- the box may have integrated heating elements which avoids the use of a separate oven.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14757536.9A EP2961584A4 (en) | 2013-02-26 | 2014-02-24 | A method of preparing a mould for injection molding |
US14/770,701 US20160001468A1 (en) | 2013-02-26 | 2014-02-24 | A method of preparing a mould for injection molding |
AU2014223297A AU2014223297A1 (en) | 2013-02-26 | 2014-02-24 | A method of preparing a mould for injection molding |
AU2018250522A AU2018250522B2 (en) | 2013-02-26 | 2018-10-22 | A method of preparing a mould for injection molding |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013900647A AU2013900647A0 (en) | 2013-02-26 | A method of preparing a mould for injection molding | |
AU2013900647 | 2013-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014131076A1 true WO2014131076A1 (en) | 2014-09-04 |
Family
ID=51427398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2014/000167 WO2014131076A1 (en) | 2013-02-26 | 2014-02-24 | A method of preparing a mould for injection molding |
Country Status (4)
Country | Link |
---|---|
US (1) | US20160001468A1 (en) |
EP (1) | EP2961584A4 (en) |
AU (2) | AU2014223297A1 (en) |
WO (1) | WO2014131076A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0061261A1 (en) * | 1981-03-20 | 1982-09-29 | Ex-Cell-O Corporation | Polyurethane molding process with siloxane internal release agent |
US20040235683A1 (en) * | 2003-05-23 | 2004-11-25 | Moffett Robert Harvey | Mold release composition and process therewith |
US20060247368A1 (en) * | 2003-07-25 | 2006-11-02 | Zheng Lu | Low voc-solvent based mold release agent and curable mold release compositions based thereon |
US20080088051A1 (en) * | 2006-10-16 | 2008-04-17 | Robert Harvey Moffett | Rotational molding paint-ready polyurethane |
US20100239783A1 (en) * | 2007-09-06 | 2010-09-23 | Gouping Mao | Methods of forming molds and methods of forming articles using said molds |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4504313A (en) * | 1983-04-13 | 1985-03-12 | Ici Americas Inc. | Polyamines and polyols containing a polysiloxane internal mold release agent for use in preparing polyurethane and polyurea resins |
JP2701946B2 (en) * | 1988-12-07 | 1998-01-21 | ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニー | Rubber tire molding method |
JP4067718B2 (en) * | 1999-09-20 | 2008-03-26 | Jsr株式会社 | Resin mold processing method and resin mold |
DE102005059706B4 (en) * | 2005-12-12 | 2011-08-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 80686 | Process for producing a release layer and substrate surface with release layer |
JP5636725B2 (en) * | 2010-04-26 | 2014-12-10 | 大日本印刷株式会社 | Release film for molding and method for producing the same |
CN103189422B (en) * | 2010-11-02 | 2015-05-27 | 3M创新有限公司 | Siloxane graft co-polymers for mold release |
US20140087067A1 (en) * | 2012-09-21 | 2014-03-27 | Frederic Gerard Auguste Siffer | Method of coating a metal mold surface with a polymer coating, mold for rubber products and method of molding rubber products |
-
2014
- 2014-02-24 US US14/770,701 patent/US20160001468A1/en not_active Abandoned
- 2014-02-24 EP EP14757536.9A patent/EP2961584A4/en not_active Withdrawn
- 2014-02-24 AU AU2014223297A patent/AU2014223297A1/en not_active Abandoned
- 2014-02-24 WO PCT/AU2014/000167 patent/WO2014131076A1/en active Application Filing
-
2018
- 2018-10-22 AU AU2018250522A patent/AU2018250522B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0061261A1 (en) * | 1981-03-20 | 1982-09-29 | Ex-Cell-O Corporation | Polyurethane molding process with siloxane internal release agent |
US20040235683A1 (en) * | 2003-05-23 | 2004-11-25 | Moffett Robert Harvey | Mold release composition and process therewith |
US20060247368A1 (en) * | 2003-07-25 | 2006-11-02 | Zheng Lu | Low voc-solvent based mold release agent and curable mold release compositions based thereon |
US20080088051A1 (en) * | 2006-10-16 | 2008-04-17 | Robert Harvey Moffett | Rotational molding paint-ready polyurethane |
US20100239783A1 (en) * | 2007-09-06 | 2010-09-23 | Gouping Mao | Methods of forming molds and methods of forming articles using said molds |
Non-Patent Citations (1)
Title |
---|
See also references of EP2961584A4 * |
Also Published As
Publication number | Publication date |
---|---|
AU2014223297A1 (en) | 2015-09-10 |
AU2018250522B2 (en) | 2020-05-21 |
EP2961584A4 (en) | 2016-11-02 |
US20160001468A1 (en) | 2016-01-07 |
EP2961584A1 (en) | 2016-01-06 |
AU2018250522A1 (en) | 2018-11-15 |
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