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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B17/00—Methods preventing fouling
  • B08B17/02—Preventing deposition of fouling or of dust
  • B08B17/06—Preventing deposition of fouling or of dust by giving articles subject to fouling a special shape or arrangement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B17/00—Methods preventing fouling
  • B08B17/02—Preventing deposition of fouling or of dust
  • B08B17/06—Preventing deposition of fouling or of dust by giving articles subject to fouling a special shape or arrangement
  • B08B17/065—Preventing deposition of fouling or of dust by giving articles subject to fouling a special shape or arrangement the surface having a microscopic surface pattern to achieve the same effect as a lotus flower
• • 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
  • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
  • B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
  • B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
  • B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
• • 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
  • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
  • B29C37/0067—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other
• • 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
  • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
  • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition

Definitions

• Mold release agent which has hydrophobic, nanoscale particles and use of these mold release agents
• the present invention relates to the use of hydrophobic nanoparticles as mold release agents or release agents in molding processes for accelerating mold removal from the molding tools and to the mold release agents themselves.
• the mold release agents according to the invention also give moldings which have surfaces with self-cleaning properties.
• silica powder such as. B. Aerosil R 972 or Sipernat 44 either incorporated into the polymer before it is processed or mixed with polymer granules before this granulate z.
• B. is processed by blow molding, injection molding or extrusion. Polymer films produced in this way, for example, do not stick when they are wound up.
• the demolding properties of the polymers used are presumably also influenced in part, but the administration of these silicas is relatively complex, since the polymers or polymer granules must be mixed with the silicic acid before the actual shaping process.
• hydrophobic microparticles are suitable as mold release agents and the disadvantages mentioned which can occur when using the mold release agents known to date based on organic or organosilicon compounds can be avoided.
• the present invention therefore relates to a mold release agent for removing moldings from molding tools, the mold release agent not being mixed with the polymeric material used to produce the molded body prior to molding, which is characterized in that it contains microparticles with a size of 0.02 to 100 microns or the use of such microparticles as mold release agents.
• the present invention relates to a process for the production of moldings by shaping molding compositions comprising polymeric compounds using a mold release agent according to the invention, which thereby is characterized in that the mold release agent is applied to a shaping tool before a shaping step, in particular sprayed on, and then a shaping step is carried out in which the shaping tool presses the microparticles into a surface of the molded body produced.
• a suitable choice of the process parameters by fixing the particles in the surface of the polymer can result in a surface which is extremely difficult to wet by water. This surface can have self-cleaning properties.
• the mold release agents according to the invention have the advantage that they are based on ecologically relatively well tolerated materials.
• the use of microparticles based on inorganic substances, such as. B. fumed silica is unproblematic from an ecological point of view.
• the mold release agent according to the invention also has the advantage that it can be used in conventional processes for the production of moldings, in particular injection-molded bodies. Molded parts are usually produced using molds on which the
• Molding compound is molded.
• the mold release agent according to the invention is preferably applied to the shaping tool or the mold before the actual shaping or molding. In this simple way, the molded body / injection molded body can be easily removed from the shaping tool or the injection mold. Are the microparticles of the
• Mold release agents fixed on or in the surface during the molding process can additionally have self-cleaning properties.
• What is particularly advantageous about this type of use of the mold release agent is the fact that the
• the mold release agent does not have to be worked into the material used in the molding process in a complex process step, or if it is
• the aspect ratio is defined here as the quotient of the medium height to the medium width of the structure.
• Criteria are realized in nature, for example in the lotus leaf.
• the surface of a plant formed from a hydrophobic, wax-like material has elevations that are a few ⁇ m apart. Water drops essentially only come into contact with these tips.
• Such water-repellent surfaces have been widely described in the literature. An example of this is an article in Langmuir 2000, 16, 5754, by
• DE 101 18 348 describes polymer fibers with self-cleaning surfaces in which the self-cleaning surface is obtained by the action of a solvent which has structure-forming particles, dissolving of the surface of the polymer fibers by the solvent, adhering the structure-forming particles to the detached surface and removing the solvent becomes.
• the disadvantage of this method is that when processing the polymer fibers (spinning, knitting, etc.), the structure-forming particles and thus the structure which causes the self-cleaning surface can be damaged or, under certain circumstances, can even be lost entirely and the self-cleaning effect can also be lost goes.
• the use of microparticles as mold release agents is not described here. The invention is described below by way of example, without being limited to these embodiments.
• the mold release agent according to the invention for removing moldings from molding tools is distinguished by the fact that it has microparticles with a size of 0.02 to 100 ⁇ m.
• the use of such microparticles as mold release agents shows the advantages mentioned above.
• the mold release agent preferably has microparticles with an average particle size of 0.02 to 100 ⁇ m, particularly preferably from 0.1 to 50 ⁇ m and very particularly preferably from 0.1 to 30 ⁇ m. Suitable microparticles can, however, also have a particle size of less than 500 .mu.m, or may aggregate from primary particles into agglomerates or aggregates with a size of 0.2 to 100 ⁇ m.
• the microparticles have hydrophilic or hydrophobic, preferably hydrophobic, properties, the hydrophobic properties being based on the material properties of the materials present on the surfaces of the particles themselves or can be obtained by treating the particles with a suitable compound.
• a suitable compound e.g. B. can be treated with a compound from the group of alkylsilanes, fluoroalkylsilanes or disilazanes or similar organosilicon compounds. Typical representatives of such compounds are e.g. B. sold by Degussa under the trade name Dynasylan ® .
• the mold release agent preferably has microparticles selected from silicates, minerals, metal oxides, metal powders, silicas, pigments or polymers, very particularly preferably from pyrogenic silicas, precipitated silicas, aluminum oxide, silicon oxide, doped silicates, titanium dioxides or powdery polymers.
• Microparticles which are particularly suitable for the mold release agent according to the invention are those which have an irregular fine structure in the nanometer range on the surface.
• the microparticles with the irregular fine structure preferably have elevations with an aspect ratio of greater than 1, particularly preferably greater than 1.5.
• the Aspect ratio is defined as the quotient from the maximum height to the maximum width of the survey.
• FIG. 1 The figure shows the surface of a molded body Y on which there is a particle P of the mold release agent.
• a selected elevation of the elevations E, which are present on the particles due to the fine structure of the particles has an aspect ratio of 2.5, calculated as a quotient from the maximum height of the elevation mH ′, which is 2.5 and the maximum width mB ', which is 1 in proportion.
• Preferred microparticles which have an irregular fine structure in the nanometer range on the surface are those particles which have at least one compound selected from pyrogenic silica, precipitated silica, aluminum oxide, silicon dioxide, titanium dioxide, doped silicates or powdered polymers, such as, for. B. spray-dried and agglomerated emulsions or cryomilled PTFE.
• Particularly suitable particle systems are hydrophobicized pyrogenic silicas, so-called Aerosile ® .
• hydrophobicity is also required for better demolding.
• the hydrophobic particles used can themselves be hydrophobic, such as, for example, the powdery polytetrafluoroethylene (PTFE).
• microparticles can be made hydrophobic, for example the Aerosil VPR 411 or Aerosil R 8200. However, they can also be made hydrophobic afterwards.
• Such particles to be hydrophobized are, for example, Aeroperl 90/30 ® , Sipernat silica 350 ® , aluminum oxide C ® , zirconium silicate, vanadium-doped or Aeroperl P 25/20 ® . In the latter case, the hydrophobization is expediently carried out by treatment with perfluoroalkylsilane compounds and subsequent tempering.
• the mold release agent according to the invention can be in the form of a powder or suspended in a liquid.
• the mold release agent preferably has the microparticles suspended in a liquid, preferably suspended in a volatile solvent.
• the suspensions used preferably have an alcohol, in particular ethanol or isopropanol, ketones, such as. B. acetone or methyl ethyl ketone, ether, such as. B. diisopropyl ether, or hydrocarbons such as cyclohexane.
• the suspensions very particularly preferably have alcohols.
• the suspension has from 0.1 to 10, preferably from 0.25 to 7.5 and very particularly preferably from 0.5 to 5% by weight of microparticles, based on the total weight of the suspension.
• the mold release agent is particularly suitable as a mold release agent or mold release agent for removing moldings from molds or molds which are formed by a thermal molding process selected from blow molding, extrusion blow molding, extrusion stretch blow molding, injection blow molding, injection stretch blow molding, deep drawing, stretch molding with negative pressure, stretch molding with overpressure, injection molding and rotary deep drawing.
• the mold release agent according to the invention is very particularly preferably suitable for removing molds from tires, in particular car, two-wheel, bus, aircraft, industrial and truck tires, as well as tires for agriculture or construction, from the forms of the tire presses used in the vulcanization and tread pattern of the treads are used.
• the mold release agent according to the invention is preferably used in the method according to the invention for the production of moldings by shaping.
• This process for the production of moldings by shaping polymeric compounds containing molding compositions using a mold release agent according to the invention is characterized in that the mold release agent is applied to a molding tool before a molding step and then the molding step is carried out.
• the mold release agent according to the invention is a suspension, it may be advantageous if the shaping step is carried out only after the liquid portion of the suspension has evaporated.
• the shaping tool is preferably a tool which is or can usually be used for the production of conventional moldings in the respective shaping process.
• the molding process can e.g. B. a thermal molding process, selected from blow molding, extrusion blow molding, extrusion stretch blow molding, injection blow molding, injection stretch blow molding, deep drawing, stretch forming with negative pressure, stretch forming with positive pressure, injection molding and rotary deep drawing, in which the shaping is carried out by molding a mold using a molding compound.
• the mold release agent can also be used in molding processes such.
• B. selected from calendering, extruding and surface extrude can be used. In these methods, rollers are used as shaping tools, which in particular determine the thickness or thickness of the shaped bodies.
• the mold release agent is preferably applied to the inner surfaces of the injection molding, deep drawing or blow mold during injection molding, deep drawing and blow molding and to the surface of a calender or shaping roll during calendering, extrusion or surface extrusion.
• Injection molding, calendering, surface extrusion or blow molding is particularly preferred as the shaping process, since in these processes the shaping tools, such as. B. the rollers or the molds the mold release can be applied in a simple manner.
• the mold release agent can be applied by spraying or sprinkling.
• Spraying the mold release agent containing microparticles onto the shaping tool can e.g. B. by spraying microparticle powders containing aerosols or dispersions, which in addition to the microparticles have a blowing agent or a, preferably volatile solvent.
• the suspensions used preferably have an alcohol, in particular ethanol or isopropanol, ketones, such as. B. acetone or methyl ethyl ketone, ether, such as. B. diisopropyl ether, or hydrocarbons such as cyclohexane.
• the suspensions very particularly preferably have alcohols. It can be advantageous if the suspension has from 0.1 to 10, preferably from 0.25 to 7.5 and very particularly preferably from 0.5 to 5% by weight of microparticles, based on the total weight of the suspension.
• the injection mold has a mold surface temperature of 30 to 150 ° C.
• the temperature of the mold can also have a temperature in the range mentioned, regardless of the microparticles or the application of the microparticles.
• the mold release agent is applied to a shaping tool before a shaping step and then a shaping step is carried out in which the microparticles of the shaping tool can be pressed into a surface of the molded body that has not yet solidified.
• a shaping step is carried out in which the microparticles of the shaping tool can be pressed into a surface of the molded body that has not yet solidified.
• the microparticles are preferably pressed in such that at least some of the particles, preferably at least 50% of the particles, only to a maximum of 90% of their diameter, preferably with 10 to 70%, preferably with 20 to 50% and very particularly preferably with 30 to 40% of their average particle diameter are pressed into the surface of the molded body.
• Preferred materials for the shaping process are polymers or polymer blends which comprise a polymer based on polycarbonates, poly (meth) acrylates, polyamides, polyvinyl chloride, polyethylenes, polypropylenes, aliphatic linear or branched polyalkenes, cyclic polyalkenes, polystyrenes, polyesters, polyether sulfones , Polyacrylonitrile or polyalkylene terephthalates, poly (vinylidene fluoride), poly (hexafluoropropylene),
• ABS acrylonitrile-butadiene-styrene terpolymers
• polyisoprene polychlorisoprene, synthetic or natural rubber
• poly (perfluoropropylene oxide) poly (fluoroalkyl acrylate), poly (fluoroalkyl methacrylate), poly (vinyl perfluoroalkyl ether) or other polymers made from perfluoroalkoxy compounds, poly (isobutylene oxide) , Poly (4-methyl-1-pentene), polynorbones as homo- or copolymer or mixtures thereof.
• Polymers are preferably used as materials for the injection molding as the shaping process, which are a polymer based on polycarbonates, poly (meth) acrylates, polyamides, polyvinyl chloride, polyethylenes, polypropylenes, aliphatic linear or branched polyalkenes, cyclic polyalkenes, polystyrenes, polyesters, polyether sulfones , Polyacrylonitrile or polyalkylene terephthalates, poly (vinylidene fluoride),
• polymers are preferably used as the shaping process, which are a polymer based on polycarbonates, poly (meth) acrylates, polyamides, polyvinyl chloride, polyethylenes, polypropylenes, aliphatic linear or branched polyalkenes, cyclic polyalkenes, polystyrenes, polyesters, polyacrylonitrile , Poly (vinylidene fluoride) or other polymers made of polyoxymethylene, polychloroisoprene, poly (isobutene) or ABS as homo- or copolymer or mixtures thereof.
• Polymers are preferably used as materials for blow molding as the shaping process, which are a polymer based on polycarbonates, polyamides, polyvinyl chloride, polyethylenes, polypropylenes, aliphatic linear or branched polyalkenes, cyclic polyalkenes, polystyrenes, polyesters, ABS, as homo- or copolymer or mixtures thereof.
• Polymers are preferably used as materials for calendering as the shaping process, which are a polymer based on polyvinyl chloride, acrylonitrile-butadiene-styrene terpolymer, synthetic and natural rubber.
• a green tire is usually vulcanized in a tire press, whereby the composite of the green tire is solidified and the tread pattern is generated.
• the tire presses have one, two or more shapes which represent a negative of the tread of the tire.
• the green tire is pressed into the shape or shapes or the shape or shapes into the green tire, the shape being heatable to enable the vulcanization process.
• the mold release agent according to the invention is applied to the molds before the actual shaping and vulcanization takes place.
• the molding compositions used in the molding process can also include fillers and / or pigments, such as. B. in injection molding glass balls or fibers or soot and / or silica in tire manufacture, deposits such as in calendering or in tire manufacture (textile or steel belt), or other auxiliaries or additives such. B. have plasticizers.
• the process parameters in the various shaping processes can be set in a known manner. Since the method according to the invention does not have to carry out an additional step which changes the material properties before the shaping process, the shaping processes can be carried out in exactly the same way as without the addition of the mold release agent according to the invention. So is z. B. the pressure at which the material is injected into the injection mold during injection molding is preferably greater than 40 bar, but is, like other parameters to be observed during injection molding, such as. B. temperature depends on the type of polymer used for injection molding and on the geometry of the injection molded part used. The determination of shaping parameters belongs to the knowledge of a person skilled in the art and is not explained in more detail here.
• the mold release agent used in the process according to the invention preferably has those which have at least one material selected from silicates, minerals, metal oxides, metal powders, silicas, pigments or polymers.
• the mold release agent used preferably has microparticles which have a particle diameter of 0.02 to 100 ⁇ m, particularly preferably from 0.1 to 50 ⁇ m and very particularly preferably from 0.1 to 30 ⁇ m. It is also possible to use mold release agents which have microparticles with diameters of less than 500 nm or but have the microparticles that aggregate from primary particles into agglomerates or aggregates with a size of 0.2 to 100 ⁇ m.
• Mold release agents are preferably used which, as microparticles, in particular as particles which have an irregular fine structure in the nanometer range on the surface, have those particles which have at least one compound selected from pyrogenic silica, precipitated silica, aluminum oxide, mixed oxides, doped silicates, titanium dioxides or powdery Have polymers.
• Preferred particles which have an irregular fine structure in the nanometer range on the surface have elevations in this fine structure which have an aspect ratio of greater than 1, particularly preferably greater than 1.5 and very particularly preferably greater than 2.5. The aspect ratio is defined as the quotient from the maximum height to the maximum width of the survey.
• microparticles used in the mold release agent according to the invention preferably have hydrophobic properties, the hydrophobic properties being able to be attributed to the material properties of the materials present on the surfaces of the particles themselves or can be obtained by treating the particles with a suitable compound.
• they can be treated with a compound from the group of the alkylsilanes, the fluoroalkylsilanes or the disilazanes, as are available, for example, from Degussa AG under the name Dynasylan.
• the microparticles which are preferably present in the mold release agent used according to the invention are explained in more detail below.
• the particles can come from different areas.
• it can be titanium dioxide, doped silicates, minerals, metal oxides, aluminum oxide, silicas or pyrogenic silicates, Aerosile ® or powdered polymers, such as. B. spray-dried and agglomerated emulsions or cryomilled PTFE.
• Particularly suitable particle systems are hydrophobicized pyrogenic silicas, so-called aerosils. In addition to the structure, a hydrophobicity is necessary to generate the self-cleaning surfaces.
• the particles used can themselves be hydrophobic, such as PTFE.
• the particles can be hydrophobic be equipped, such as the Aerosil VPR 411 ® or Aerosil R 8200 ® , or else be hydrophobicized before use as a mold release agent.
• Such particles to be hydrophobicized before use as mold release agents are, for example, Aeroperl 90/30 ® , Sipernat silica 300 ® , aluminum oxide C ® , zirconium silicate, vanadium-doped or Aeroperl P 25/20 ® . In the latter, the hydrophobization z. B. by treatment with perfluoroalkylsilane compounds and subsequent annealing.
• Shaped bodies of any shape which can be produced using one of the shaping processes mentioned are accessible by means of the method according to the invention.
• Such shaped bodies can in particular be vessels for holding liquids or pastes.
• such shaped bodies can be selected from vessels, lampshades, buckets, storage vessels, tires, barrels, bowls, measuring cups, funnels, tubs and housing parts.
• molded bodies with a surface that has self-cleaning properties and surface structures with elevations are accessible.
• These moldings can also have any shape that can be produced using the known shaping processes.
• Such shaped bodies can in particular be vessels for holding liquids or pastes.
• such shaped bodies can be selected from vessels, lampshades, buckets, tires, storage vessels, barrels, bowls, measuring cups, funnels, tubs and housing parts.
• Moldings produced in this way with at least one surface which has elevations and self-cleaning properties are distinguished in that the surface has a firmly anchored layer of microparticles which form elevations.
• the at least partially present elevations on the surface of the shaped bodies ensure that these surface areas are difficult to wet and thus have self-cleaning properties in connection with a hydrophobicity of the surface.
• the moldings such as. B. injection molded body with surfaces with self-cleaning Properties preferably have elevations with an average height of 20 nm to 25 ⁇ m and an average distance of 20 nm to 25 ⁇ m, preferably with an average height of 50 nm to 10 ⁇ m and / or an average distance of 50 nm to 10 ⁇ m and entirely particularly preferably with an average height of 50 nm to 4 ⁇ m and / or an average distance of 50 nm to 4 ⁇ m.
• the moldings according to the invention very particularly preferably have surfaces with elevations with an average height of 0.25 to 1 ⁇ m and an average distance of 0.25 to 1 ⁇ m.
• the mean distance between the elevations is understood to mean the distance between the highest elevation of one elevation and the next highest elevation. If an elevation has the shape of a cone, the tip of the cone represents the highest elevation of the elevation. If the elevation is a cuboid, the top surface of the cuboid represents the highest elevation of the elevation.
• the moldings according to the invention have surfaces with self-cleaning properties, which preferably have an aspect ratio of the elevations of greater than 0.15.
• the elevations which are formed by the particles themselves preferably have an aspect ratio of 0.3 to 0.9, particularly preferably 0.5 to 0.8.
• the aspect ratio is defined as the quotient of the maximum height and the maximum width of the structure of the surveys.
• FIG. 2 schematically shows the surface of an injection molded body X which has anchored particles P (only one particle is shown to simplify the illustration).
• the elevation which is formed by the particle itself, has an aspect ratio of approx. 0.71, calculated as the quotient from the maximum height of the particle mH, which is 5, since only the part of the particle that contributes to the elevation protrudes from the surface of the injection molded body X, and the maximum width mB, which is 7 in relation to this.
• a selected elevation of the elevations E which are present on the particles due to the fine structure of the particles, has an aspect ratio of 2.5, calculated as a quotient from the maximum height of the elevation mH ′, which is 2.5 and the maximum width mB ', which is 1 in proportion.
• polyphenylene ether (Vestoran ® 1900, Degussa AG) was injection molded with an injection molding machine from Kraus Maffei.
• the injection mold is a hollow cylinder with a diameter of 34 mm, which is overmoulded over a length of 34 mm.
• the temperature of the cylinder core was between 78.9 ° C and 81.2 ° C in the individual tests.
• the pressure was determined that was necessary to push the cylinder produced by injection molding from the central cylinder core. In 5 measurements it was found that a demolding pressure between 90.0 and 92.6 bar is necessary for demolding.
• mold release agents which have microparticles in particular mold release agents which have an ethanolic suspension of Aerosil R8200, can be used excellently as mold release agents.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

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• 2002
  • 2002-03-12 DE DE10210671A patent/DE10210671A1/de not_active Withdrawn
• 2003
  • 2003-02-03 WO PCT/EP2003/001025 patent/WO2003076157A1/de active Application Filing
  • 2003-02-03 JP JP2003574408A patent/JP2005519787A/ja active Pending
  • 2003-02-03 EP EP03704514A patent/EP1483094A1/de not_active Withdrawn
  • 2003-02-03 AU AU2003206817A patent/AU2003206817B2/en not_active Ceased
  • 2003-02-03 CA CA002477786A patent/CA2477786A1/en not_active Abandoned
  • 2003-02-03 US US10/506,995 patent/US7517487B2/en not_active Expired - Fee Related

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