EP2654975A1 - Method for pretreatment of plastic objects before coating - Google Patents
Method for pretreatment of plastic objects before coatingInfo
- Publication number
- EP2654975A1 EP2654975A1 EP11850874.6A EP11850874A EP2654975A1 EP 2654975 A1 EP2654975 A1 EP 2654975A1 EP 11850874 A EP11850874 A EP 11850874A EP 2654975 A1 EP2654975 A1 EP 2654975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- chambers
- microemulsion
- specific surface
- coating
- 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- Withdrawn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
- 238000000576 coating method Methods 0.000 title claims abstract description 61
- 239000011248 coating agent Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004033 plastic Substances 0.000 title claims description 22
- 229920003023 plastic Polymers 0.000 title claims description 22
- 239000004530 micro-emulsion Substances 0.000 claims abstract description 56
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 238000001035 drying Methods 0.000 claims abstract description 33
- 238000004320 controlled atmosphere Methods 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000012459 cleaning agent Substances 0.000 claims abstract description 24
- 239000002991 molded plastic Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- ZBJVLWIYKOAYQH-UHFFFAOYSA-N naphthalen-2-yl 2-hydroxybenzoate Chemical compound OC1=CC=CC=C1C(=O)OC1=CC=C(C=CC=C2)C2=C1 ZBJVLWIYKOAYQH-UHFFFAOYSA-N 0.000 claims description 33
- 238000004364 calculation method Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 15
- QFMDFTQOJHFVNR-UHFFFAOYSA-N 1-[2,2-dichloro-1-(4-ethylphenyl)ethyl]-4-ethylbenzene Chemical compound C1=CC(CC)=CC=C1C(C(Cl)Cl)C1=CC=C(CC)C=C1 QFMDFTQOJHFVNR-UHFFFAOYSA-N 0.000 claims description 12
- 239000002736 nonionic surfactant Substances 0.000 claims description 12
- 229920000136 polysorbate Polymers 0.000 claims description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- 230000002209 hydrophobic effect Effects 0.000 claims description 9
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 8
- JGHZJRVDZXSNKQ-UHFFFAOYSA-N methyl octanoate Chemical compound CCCCCCCC(=O)OC JGHZJRVDZXSNKQ-UHFFFAOYSA-N 0.000 claims description 8
- 238000007639 printing Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 6
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 6
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 6
- IJCWFDPJFXGQBN-RYNSOKOISA-N [(2R)-2-[(2R,3R,4S)-4-hydroxy-3-octadecanoyloxyoxolan-2-yl]-2-octadecanoyloxyethyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCCCCCCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCCCCCCCCCCCC IJCWFDPJFXGQBN-RYNSOKOISA-N 0.000 claims description 6
- LWZFANDGMFTDAV-BURFUSLBSA-N [(2r)-2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-BURFUSLBSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 6
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 6
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 6
- 229920000053 polysorbate 80 Polymers 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 6
- 235000011067 sorbitan monolaureate Nutrition 0.000 claims description 6
- 235000011078 sorbitan tristearate Nutrition 0.000 claims description 6
- 150000002194 fatty esters Chemical class 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- HIQIXEFWDLTDED-UHFFFAOYSA-N 4-hydroxy-1-piperidin-4-ylpyrrolidin-2-one Chemical compound O=C1CC(O)CN1C1CCNCC1 HIQIXEFWDLTDED-UHFFFAOYSA-N 0.000 claims description 4
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 4
- 239000005641 Methyl octanoate Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 239000002274 desiccant Substances 0.000 claims description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 239000008199 coating composition Substances 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 24
- 239000003570 air Substances 0.000 description 16
- 230000032258 transport Effects 0.000 description 13
- 238000011109 contamination Methods 0.000 description 10
- 238000001746 injection moulding Methods 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 238000002203 pretreatment Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000010422 painting Methods 0.000 description 5
- 229920000299 Nylon 12 Polymers 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005108 dry cleaning Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/18—Hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
- C11D17/0017—Multi-phase liquid compositions
- C11D17/0021—Aqueous microemulsions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2006—Monohydric alcohols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2093—Esters; Carbonates
-
- 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
- B05D3/04—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 exposure to gases
- B05D3/0486—Operating the coating or treatment in a controlled atmosphere
-
- 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
- B05D3/10—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 other chemical means
- B05D3/101—Pretreatment of polymeric substrate
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/18—Glass; Plastics
Definitions
- the present invention relates to the field of coating objects. More specifically, the invention relates to a method for continuously cleaning and pre-treating objects made of plastic materials and/or metallic materials followed by a coating step. The invention also provides a system designed for carrying our said method. Finally, the invention provides a specific cleaning preparation to be used in the initial pre-treatment step and in the total coating process.
- Plastic parts or objects are typically manufactured in several steps.
- the first step comprises moulding or extrusion of the plastic object by any known plastic injection method
- the second step comprises lacquering of the object by any generally known method
- the third step comprises any generally known printing method.
- plastic and/or metallic parts are typically manufactured in several steps.
- the first step comprises moulding by any known method.
- the product is packed on tape on reel, in container, or any other known packaging method after moulding.
- the parts are then moved to the next station which is directed to surface treatment where the parts could be treated by any known method such as plasma treatment, and/or lacquering and/or decoration of the parts.
- Products that are handled in free atmosphere are exposed to contamination due to logistic processes before surface treatment. They may accordingly be exposed to dust, fibres, protein, bacteria, hair, etc.
- the product itself is typically electrically loaded due to friction etc, which increases adhesion of contaminating objects and compounds.
- There are different methods in use for cleaning of surfaces. Examples of devices and methods in use are carbon fibre brushes, cupper wires, antistatic polarisation equipment, dry cleaning including surfactants, and blasting with fluids, ice crystals or sand. US 6030663, US 6200943, US 6297206,
- Contamination before coating causes reject of finished parts for estetical reasons (for example loss of coating, uneven surface, etc.), optical reasons (for example lenses and displays are not transparent and/or does not have specified optical characteristics) and functional reasons (for example not specified isolation characteristics leading to battery and electricity problems).
- estetical reasons for example loss of coating, uneven surface, etc.
- optical reasons for example lenses and displays are not transparent and/or does not have specified optical characteristics
- functional reasons for example not specified isolation characteristics leading to battery and electricity problems.
- the plastics objects are conventionally lacquered in an open spray system, a dip system, Inmould labeling or Inmould Decoration Moulding system. These systems are open to the atmosphere. During the spray lacquering process, over-spray of paint occur. Such over-spray of paint constitutes an
- WO 03/049929 a single tool for injection moulding as well as painting of an object is disclosed.
- an injection moulding station the object is moulded between a turnable mould part and a stationary mould part.
- the turnable mould part with the object is rotated 90° to another station where paint is applied to the object, with the object still placed on the turnable mould part.
- the paint applied to the object is UV hardened and then the object is ejected from the turnable mould part.
- the turnable mould part is rotated back to the injection moulding station to start the cycle again.
- the advantage of the system of WO 03/049929 is that there is only one machine for production and painting of the plastic object without the need to transport the object from an injection moulding machine.
- the injection moulding step is essentially faster than the painting and hardening step.
- cycle times are expanded and productivity reduced.
- the turnable movable part might be contaminated with paint and thus has to be cleaned from time to time in order to avoid damages of the objects during the injection moulding step.
- WO 2005/075170 discloses a system for producing and coating an object, comprising a manufacturing machine and an object treatment device wherein said object treatment device comprises a painting station with means for applying a coating to a surface of said object, at least another station for treating said object and a conveyor which allows said object to move between the stations. Most stations (except the loading station) are typically located within an enclosure comprising means for creating a controlled atmosphere. Accordingly, the system of WO 2005/075170 is more efficient compared to the disclosure of WO 03/049929.
- the present invention provides a method for producing and coating a specific surface of moulded plastic object, comprising the steps of: a) producing said object in a manufacturing machine according to per se known methods;
- transferring said object into and through a tunnel comprising at least three, optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprises an opening to the surroundings, the consecutive chambers of the tunnel having a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings, during which transferring the object receives a treatment comprising: applying, in chamber A, a microemulsion comprising a cleaning agent to said specific surface;
- the invention provides an apparatus for coating a surface of a moulded plastic object in accordance with the method of the first aspect, said apparatus comprising a tunnel comprising at least three, optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprises an opening to the surroundings, the consecutive chambers of the tunnel having means for achieving a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings,
- said tunnel having a means for transferring a moulded plastic object to be coated from the entrance opening outside chamber A to the exit opening outside chamber E,
- chamber A having means, such as one or more nozzles, for applying a microemulsion comprising a cleaning agent,
- chamber B having means, such as one or more nozzles, for injecting a rinsing agent
- optional chamber C having drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles, optional chamber D having temperature adjusting means such as heating or cooling means, and chamber E having per se known coating means.
- drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles
- optional chamber D having temperature adjusting means such as heating or cooling means
- chamber E having per se known coating means.
- the present invention provides a system for controlling an apparatus according any of claims 8 and 9, said system comprising:
- a plurality of sensors for detecting presence and/or motion of an object to be coated
- a plurality of sensors for detecting flow and direction of a gas stream;
- injection means such as one or more nozzles, for injecting a rinsing agent in chamber B;
- said plurality of sensors for detecting presence and/or motion of an object to be coated being set up to send information to the control and calculation means regarding when such an object is in a pre-determined position;
- said plurality of sensors for detecting flow and direction of a gas stream being set up to send information to the control and calculation means regarding the gas flow in the chambers;
- said plurality of temperature sensors being set up to send information to the control and calculation means regarding temperature in the chambers; said control and calculation means being set up to instruct said means for controlling application of a microemulsion comprising a cleaning agent in chamber A to apply said microemulsion when an object to be coated is transferred through chamber A;
- control and calculation means being set up to instruct said means for controlling said injection means in chamber B to provide injection of said rinsing agent when an object to be coated is transferred through chamber B; optionally said control and calculation means being set up to instruct said means for controlling drying means in optional chamber C to provide drying when an object to be coated is transferred through chamber C;
- the present invention provides a composition for cleaning a plastic surface when preparing said surface for coating and/or printing, said composition being useful in the method of the first aspect, said composition being an oil-in-water microemulsion comprising:
- the present invention provides use of a composition according to the fourth aspect for cleaning a plastic surface when preparing said surface for coating and/or printing.
- the present invention provides a method for producing and coating a specific surface of moulded plastic object, comprising the steps of: a) producing said object in a manufacturing machine according to per se known methods;
- moulded plastic object relates to any kind of moulded plastic object intended to be coated such an outer cover of an electronic device such as a mobile phone, spectacle frames, or packages intended for containing cosmetics.
- the present invention is well suited for production of coated plastic objects the surfaces of which have a high gloss.
- the moulded plastic objects may be produced by any per se known method for producing a moulded plastic object, such as injection moulding, extrusion moulding, metal pouring or rolling mill.
- the object is transferred through a tunnel comprising at least three and optionally four or five consecutive partially separated chambers.
- the tunnel is arranged in an area have a controlled atmosphere such as a clean room.
- the tunnel is also adapted for containing a controlled atmosphere.
- Consecutive partially separated chambers is meant that the chambers are not isolated from each other or from the surroundings. Typically, they are separated by walls containing openings. These openings may in turn typically be partially sealed by air knives or slidable doors, which slidable doors may be automatic.
- the controlled atmosphere may hence flow from one chamber to another and out into the clean room where the tunnel typically is located.
- the net air transport in the tunnel is directed from chamber B through chamber A and out to the surroundings.
- the tunnel comprises a chamber C and/or a chamber D the net air transport is directed from the chamber closest to chamber E, through remaining consecutive chambers and out to the surroundings through the partial opening in chamber A
- volatile rinsing agent relates to an agent capable of removing the microemulsion comprising a cleaning agent.
- the microemulsion typically is of the oil-in-water type, it is advantageous for cost and environmental reasons to use clean water and/or ethanol as a rinsing agent.
- Carbon dioxide in liquid and/or gaseous form and nitrogen are two other examples of rinsing agents. Clean water is preferred.
- chamber C as well as the drying step carried out there can be dispensed with. In that case the object to be coated is directly transferred to chamber D, in case temperature adjustment is needed, or directly to chamber E in case no temperature adjustment is needed. It is advantageous that all of the microemusion applied in chamber A is removed from the object to be coated during the rinsing step in chamber B.
- the drying step optionally carried out in optional chamber C is typically carried out by one or more mechanisms selected from ethanol spraying, streams of air or nitrogen, heat typically produced by infrared radiation or other conventional heating sources.
- a liquid rinsing agent is used in the rinsing step in chamber B, it is advantageous that the liquid rinsing agent is completely removed during the drying step in chamber C.
- the temperature adjustment step optionally carried out in optional chamber D is carried out using conventional heating or cooling means. What is important to consider are the temperature requirements of the final coating step in chamber E.
- controlled atmosphere relates to gas compositions normally used in clean rooms, for instance when manufacturing semiconductor structures. Hence, the amount of particles in the controlled atmosphere should be very low. Clean air or inert gasses such as nitrogen or argon or mixtures thereof could be used. The skilled person knows how to select a suitable controlled atmosphere for a given situation.
- the transferring of the moulded plastic object through said tunnel comprising chambers A - E is done in such a way that no reloading is carried out during the whole transfer operation and that the specific surface is only exposed to said microemulsion comprising a cleaning agent, said volatile rinsing agent, gaseous agents and the coating
- the object to be coated is hung under a conveyor (in case the object to be coated is to be coated from many directions).
- the object may be hung in such a way that it can be rotated in order to further improve coating from many different directions.
- the object can be arranged on a transporter such as a transport belt (in case the coating is to be applied from above).
- the conveyor or transport belt typically runs through the whole tunnel and no reloading is therefore necessary.
- the microemulsion comprising a cleaning agent that is applied in chamber A is an oil-in-water microemulsion comprising: a) 19 - 25% (wt) of a non-ionic surfactant component;
- the non-ionic surfactant component is selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005.
- the hydrophobic component is selected from the group of isopropyl myristate, Methyl octanoate, heptane and cyclohexane.
- the volatile rinsing agent in chamber B that is capable of removing said microemulsion from said specific surface is selected from pure water, pure ethanol, nitrogen, and liquid or gaseous carbon dioxide.
- the drying step in chamber C is carried out in a stream of air, nitrogen and/or carbon dioxide, optionally in combination with heat.
- All chemicals used in relation to the present invention are of high, and preferably the highest commercially available quality and purity. It is especially important that the rinsing agent has a high purity.
- the present invention provides an apparatus for coating a surface of a moulded plastic object in accordance with the method of the first aspect
- said apparatus comprising a tunnel comprising at least three and optionally four or five consecutive partially separated chambers in the direction A to E, where chambers A and E each comprise an opening to the surroundings, the consecutive chambers of the tunnel having means for achieving a controlled atmosphere obtained by injection, said injection of controlled atmosphere being set up in such a way that the net air transport in said tunnel is directed from chamber B to A and out to the surroundings as well as from chamber E and out to the surroundings,
- said tunnel having a means for transferring a moulded plastic object to be coated from the entrance opening outside chamber A to the exit opening outside chamber E,
- chamber A having means, such as one or more nozzles, for applying a microemulsion comprising a cleaning agent,
- chamber B having means, such as one or more nozzles, for injecting a rinsing agent
- drying means such as a source of infrared radiation or means for injecting a drying agent, such as one or more nozzles,
- means for achieving a controlled atmosphere typically relates to means for specific injection of said atmosphere in defined locations, Typically, such means could be nozzles for injecting gasses. In order to achieve the desired net transport of controlled atmosphere, such nozzles are arranged close to the opening between chambers D and E (or alternatively C and E in case chamber D is missing, or B and E in case both chambers C and D re missing). Hence an elevated pressure is obtained which initiates the gas transport.
- the means for injecting a microemulsion comprising a cleaning agent, as well as the means for injecting a rinsing agent could be any nozzle suitable for injecting liquids, preferably aqueous liquids.
- the nozzles are arranges in any suitable way in order to facilitate application of the microemulsion/rinsing agent.
- any means for injecting gasses in chambers B and C are ordinary nozzles that could be arranged in any suitable way.
- the drying means in chamber C is any suitable source of infrared radiation that is arranged in such a way that the area to be coated is efficiently dried.
- the heating and/or cooling means of chamber E are also of standard type.
- chambers A - E are separated by separation means selected from the group of air knives and automatic sliding doors set up to open when an object to be coated is about to pass.
- the present invention provides a system for controlling an apparatus according any of claims 8 and 9, said system comprising:
- a plurality of sensors for detecting presence and/or motion of an object to be coated
- a plurality of sensors for detecting flow and direction of a gas stream;
- injection means such as one or more nozzles, for injecting a rinsing agent in chamber B;
- said plurality of sensors for detecting presence and/or motion of an object to be coated being set up to send information to the control and calculation means regarding when such an object is in a pre-determined position; said plurality of sensors for detecting flow and direction of a gas stream being set up to send information to the control and calculation means regarding the gas flow in the chambers;
- said plurality of temperature sensors being set up to send information to the control and calculation means regarding temperature in the chambers; said control and calculation means being set up to instruct said means for controlling application of a microemulsion comprising a cleaning agent in chamber A to apply said microemulsion when an object to be coated is transferred through chamber A;
- control and calculation means being set up to instruct said means for controlling said injection means in chamber B to provide injection of said rinsing agent when an object to be coated is transferred through chamber B; said control and calculation means being set up to instruct said means for controlling drying means in chamber C to provide drying when an object to be coated is transferred through chamber C;
- control and calculation means being set up to instruct said means for controlling temperature adjusting means to provide a pre-determined temperature adjustment using data from said plurality of temperature sensors when an object to be coated is transferred through chamber D.
- the motion sensors, sensors for detecting flow and direction of gas streams as well as different control means are all standard components. The skilled person could easily select suitable such components.
- the control and calculation means is typically a micro-computer or a personal computer using standard interfaces.
- the present invention provides a composition for cleaning a plastic surface when preparing said surface for coating and/or printing, said composition being useful in the method of the first aspect, said composition being an oil-in-water microemulsion comprising:
- the non-ionic surfactant component is selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005.
- non-ionic surfactants selected from the group of Berol 533, Berol 535, Berol 537, Berol Ox 91 -4, Berol OX 91 -6, AG6202, 2EH2PO4EO, Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65, Tween 85, Ethylan 1003, and Ethylan 1005. All these non-ionic surfactants are easy to obtail.
- Berol 533, Berol 535, Berol 537, Berol OX 91 -4, Berol OX 91 -6, Ethylan 1003, Ethylan 1005, AG6202 and 2EH2PO4EO are all readily available from Akzo Nobel Surface Chemistry AB, SE.
- Span 20, Span 80, Span 65, Span 85, Tween 20, Tween 80, Tween 65 and Tween 85 are all readily available from Croda International PLC. Particularly good results have been obtained for Berol 535, Berol OX 91 -4 and Berol OX 91 -6.
- the hydrophobic component is selected from the group of isopropyl myristate, Methyl octanoate, heptane and cyclohexane.
- the present invention provides use of a composition according to the fourth aspect, for cleaning a plastic surface when preparing said surface for coating and/or printing.
- Figure 1 discloses an apparatus according to the second embodiment of the present invention.
- FIG. 1 an apparatus 10 according for carrying out the method of the first aspect of the present invention is shown.
- An object to be coated 12 is attached to a conveyor 14.
- the conveyor 14 typically transports said object 12 through the whole apparatus 10 without any reloading operation. It is advantageous that the object 12 is hung under the conveyor 14 as it then is possible to coat the object 12 from several directions at the same time. In certain cases the object is mounted on a holder enabling rotation of the object (embodiment not shown). The holder is then transported through the tunnel by the conveyor. It is of course also possible to arrange the object 12 on top of the conveyor 14, or on a transport belt, especially if it is only desirable to coat the object 12 from above. Furthermore, irrespective of how the objects are transported through the tunnel, it is of course possible to treat more than one object at a time in a chamber of the tunnel.
- the apparatus 10 shown in Figure 1 is a tunnel comprised of five consecutive chambers A, B, C, D and E. Chambers A and E both have partial openings 16, 18 to the surroundings outside the apparatus 10. There is a partial opening 20 between chambers A and B, a partial opening 22 between chambers B and C, a partial opening 24 between chambers C and D and a partial opening between chamber D and E. As already indicated, the term "partial opening" indicates that the openings are not completely sealed.
- these openings 16, 18, 20, 22, 24, 26 may be partially sealed by air knives or slidable doors, which slidable doors may be automatic.
- the controlled atmosphere may hence flow from one chamber to another and out into the clean room where the tunnel typically is located.
- Object detectors 28, 30, 32, 34, 36, 38 monitor the presence of an object to be coated and typically sends signals to a control and calculation means 202 (only shown in Figure 2) in order to initiate door openings and/or treatment steps in the different chambers A - E.
- Chambers A, B, C and D are all associated with pre-treatment of the surface of the object 12 to be coated.
- Chamber E is associated with the actual coating operation.
- the pre-treatment of the object 12 to be coated that is carried out in chamber A is application of a microemulsion comprising a cleaning agent.
- a microemulsion comprising a cleaning agent.
- the advantage of applying such a microemulsion is that such an emulsion is a good solvent for any kind of contamination that may be present on the surface to be coated.
- Microemulsions that could be used in connection with the present invention will be further described later on.
- the microemulsion is injected into chamber A from different nozzles 40.
- the embodiment shown in Figure 1 is focused on injection of the microemulsion as such an application is very efficient. However, it is of course possible to apply the microemulsion in other ways such as dipping the object into the emulsion or pouring the emulsion over the object.
- the pre-treatment carried out in chamber B is rinsing.
- the rinsing step can be carried out by injecting liquid or gaseous rinsing agents through rinsing nozzles 42.
- suitable liquid rinsing agents are clean water, ethanol or liquid carbon dioxide.
- Suitable gaseous rinsing agents are nitrogen or gaseous carbon dioxide.
- drying step In case a liquid rinsing agent such as water or ethanol has been used, it is advantageous to include a drying step. Typically, such a drying step is carried out in chamber C. Any suitable means for drying can be used. Typical examples of drying means are a source 44 of infrared radiation or gas streams blowing over the object 12 to be coated. In case carbon dioxide or another gaseous rinsing agent has been used in chamber B, it is not necessary to include any chamber C or the associated drying step.
- This temperature adjustment step is carried out in chamber D and involves using means 48 for increasing the temperature as well as means 46 for reducing the temperature. Any suitable means adapted for the particular controlled atmosphere of the tunnel may be used. However, in case the object already has a suitable temperature it is also possible to exclude chamber D and the associated temperature adjustment treatment.
- the actual coating treatment is carried out in chamber E by any suitable coating method.
- flow 52 is associated with the pre-treatment part of the process.
- the flow starts from nozzles 56 close to the partial opening into chamber E.
- the apparatus 10 comprises a chamber D
- nozzles 56 are located there.
- nozzles 56 are located in chamber C.
- both chambers C and D are absent, nozzles 56 are located in chamber B.
- Nozzles 58 for starting flow 54 are always located in chamber E.
- control system 200 for the apparatus 10 shown in Figure 1 is shown. Accordingly, the central part system 200 is a control and calculation means 202. The control and
- calculation means 202 is typically a personal computer or a microcomputer, and receives information from a variety of sensors. Examples of such sensors that are shown in Figure 2 are a location or motion sensor 204 for detecting and monitoring position and movement of an object to be coated, gas flow detection means 206 for determining amount and direction of a gas flow and temperature sensors 212.
- the control and calculation means 202 uses the information obtained from these sensors for controlling the apparatus 10 by sending instructions to a plurality of means, such as means 208 for controlling application of a microemulsion comprising a cleaning agent, means 210 for controlling injection of rinsing agent, means 214 for controlling drying means and means 216 for controlling temperature adjustment means.
- the sensors and means used in the system are of standard type and any commercially available such means and sensors could be included.
- the system renders it possible to automatize the process shown in Figure 1 . Furthermore, such a system also leads to increased efficiency and reduced environmental impact as chemicals are only injected when needed, and temperature is only adjusted when needed.
- Another important part of the present invention is the microemulsion comprising a cleaning agent that is applied in chamber A. In order to minimize the amount of rejects it is believed that it is important to remove all
- the cleaning water-in-oil microemulsion or oil in water composition according to the present invention affects the surface of plastic and metallic objects in such a way that adhesion is prevented.
- Inclusion of a cleaning step using the cleaning composition of the invention before coating leads to higher productivity, higher yield but lower manufacturing costs.
- the fact that the combined cleaning and coating process is carried out in an enclosure and in a controlled atmosphere decreases environmental problems and hazards as well as energy consumption.
- yield increased from 69 % to 97%. The yield was measure on wear resistance (Ericsen test), optical effect (permeable for UV/visual light), surface defects per mm 2 (measured by optical equipment) and influence of adhesion in the interface between coating and substrate (steel wool test).
- a rinsing step is carried out with a volatile rinsing agent in order to remove the microemulsion.
- suitable rinsing agents may be pure water and ethanol as well as air, nitrogen and carbon dioxide in gaseous and supercritical form. A supercritical liquid is under such a high pressure that the border between liquid and gas has disappeared. The pressure and
- thermodynamical critical point temperature point above which supercritical liquids are formed.
- the density of the gas phase becomes more and more similar to the density of the liquid phase until they are indistinguishable.
- Supercritical liquids may diffuse through solid materials as a gas but they may also dissolve other compounds as a liquid.
- the density of a supercritical liquid may be regulated by changing temperature and/or pressure.
- Supercritical C02 may occur at pressures above 70 bar and at temperatures above room
- Liquid rinsing agents such as water and ethanol are removed in a separate drying step that may comprise drying by heating or by a gas flow. In case gaseous or supercritical rinsing agents are used it is possible to dispense with a separate drying step.
- Oil-in-water microemulsions are preferred in connection with the present invention in comparison with water-in-oil microemulsions.
- Oil-in-water microemulsions contains a
- Plastic objects were dipped into one of the microemulsions above. Then they were immersed twice in ethanol. After each immersion, the objects were flushed with air. Finally, the objects were coated with lacquer.
- Example 8 Pre-treatment and subsequent coating of plastic objects Surfaces of some plastic objects (10 surfaces of polycarbonate and 10 surfaces of polyamide 12, size: 100 x 35 mm, grooves in a square pattern) were processed in a tunnel comprising five consecutive chambers A - E. The following steps were carried out: Chamber A: The surfaces were each sprayed with 0.8 ml of the plastic objects.
- microemulsion of example 7 for 1 .5 seconds at a temperature of 20°C.
- the microemulsions were allowed to interact with the surfaces for 20 seconds.
- Chamber B The surfaces were sprayed three times and each time during 2 seconds with totally 450 ml water at a temperature of 20°C.
- Chamber C The surfaces were heated by infrared radiation during 140 seconds at a temperature of 40 °C.
- Chamber D The surfaces were cooled in a controlled atmosphere comprising pure air for 180 seconds. Their temperature after cooling was 20 °C. There was a steady flow of pure air from chamber D through chambers C, B, and A out to the surroundings. The dryness of the surfaces were checked before the final coating step. Furthermore, one polycarbonate surface and one polyamide 12 surface were removed for further measurements.
- Chamber E The surfaces were coated with an organic solvent-based lacquer and thereafter cured in a heated chamber. There was a steady flow of pure air from chamber E out to the surroundings.
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- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
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Abstract
Description
Claims
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SE1051353 | 2010-12-21 | ||
PCT/SE2011/051525 WO2012087227A1 (en) | 2010-12-21 | 2011-12-16 | Method for pretreatment of plastic objects before coating |
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EP2654975A4 EP2654975A4 (en) | 2015-04-15 |
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Cited By (1)
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CN103394482A (en) * | 2013-08-14 | 2013-11-20 | 耀安电池电源科技(深圳)有限公司 | Cleaning machine for button cells |
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JP2019099601A (en) * | 2017-11-28 | 2019-06-24 | Jxtgエネルギー株式会社 | Cleaning method using w/o emulsion cleaning liquid |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1995016567A1 (en) * | 1993-12-15 | 1995-06-22 | Oaks Robert E | Painted polyvinyl chloride articles and process for producing the same |
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JPS6034969B2 (en) * | 1980-06-30 | 1985-08-12 | 豊田合成株式会社 | Pre-painting treatment method for polyolefin products |
US5156687A (en) * | 1989-08-28 | 1992-10-20 | Nippon Paint Co., Ltd. | Method for painting pretreatment of plastic formings and cleaner for painting pretreatment |
JPH0753743A (en) * | 1993-08-11 | 1995-02-28 | Nippon Parkerizing Co Ltd | Surface preparation agent for resin molding |
US20020164426A1 (en) * | 1999-09-23 | 2002-11-07 | Ennis Thomas James | Method of adhering coatings to substrates |
JP4801841B2 (en) * | 2001-02-19 | 2011-10-26 | 東レ東燃機能膜合同会社 | Method for cleaning thermoplastic resin microporous membrane and method for producing thermoplastic resin microporous membrane using the same |
EP1718449B8 (en) * | 2004-02-03 | 2012-12-12 | MAGU E-Systems AB | Surface coating device |
US8222194B2 (en) * | 2008-05-09 | 2012-07-17 | Rhodia Operations | Cleaning compositions incorporating green solvents and methods for use |
-
2011
- 2011-12-16 EP EP11850874.6A patent/EP2654975A4/en not_active Withdrawn
- 2011-12-16 WO PCT/SE2011/051525 patent/WO2012087227A1/en active Application Filing
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WO1995016567A1 (en) * | 1993-12-15 | 1995-06-22 | Oaks Robert E | Painted polyvinyl chloride articles and process for producing the same |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103394482A (en) * | 2013-08-14 | 2013-11-20 | 耀安电池电源科技(深圳)有限公司 | Cleaning machine for button cells |
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WO2012087227A1 (en) | 2012-06-28 |
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