WO2019203852A1 - Compositions destinées à éliminer la résine d'un objet imprimé en 3d et procédés de fabrication et d'utilisation de ces dernières - Google Patents

Compositions destinées à éliminer la résine d'un objet imprimé en 3d et procédés de fabrication et d'utilisation de ces dernières Download PDF

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Publication number
WO2019203852A1
WO2019203852A1 PCT/US2018/028674 US2018028674W WO2019203852A1 WO 2019203852 A1 WO2019203852 A1 WO 2019203852A1 US 2018028674 W US2018028674 W US 2018028674W WO 2019203852 A1 WO2019203852 A1 WO 2019203852A1
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WIPO (PCT)
Prior art keywords
ether
finishing solution
weight
glycol
finishing
Prior art date
Application number
PCT/US2018/028674
Other languages
English (en)
Inventor
Marc FARFAGLIA
Cassidy GRANT
Daniel Joshua HUTCHINSON
Original Assignee
Postprocess Technologies, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Postprocess Technologies, Inc. filed Critical Postprocess Technologies, Inc.
Priority to PCT/US2018/028674 priority Critical patent/WO2019203852A1/fr
Publication of WO2019203852A1 publication Critical patent/WO2019203852A1/fr

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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
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/35—Cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • 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
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/667—Neutral esters, e.g. sorbitan esters
    • 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
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/044—Hydroxides or bases
    • 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
    • C11D3/188—Terpenes
    • 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
    • C11D3/2068—Ethers
    • 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
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3418—Toluene -, xylene -, cumene -, benzene - or naphthalene sulfonates or sulfates
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/06—Hydroxides
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/24—Hydrocarbons
    • C11D7/248—Terpenes
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C11D7/263—Ethers
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/34—Organic compounds containing sulfur
    • 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
    • C11D2111/22—Electronic devices, e.g. PCBs or semiconductors

Definitions

  • the disclosure generally relates to solutions for removing unwanted resin from an object made by additive manufacturing techniques such as 3D printing, and, more specifically, to fluidic chemical finishing solutions and methods of using such finishing solutions in order to remove unwanted resin by contacting the object with the fluidic finishing solution.
  • 3D printing is a process whereby a computer controlled device (e.g., a printer) creates an object through additive manufacturing.
  • object refers to a 3D-printed object that is not in its desired final form.
  • An object can be manufactured by stereolithography (SLA)“printing” techniques, and other methods known by those in the art.
  • SLA stereolithography
  • the additive manufacturing methods that are commonly used require additional material (“support material”) to be printed for the purpose of supporting portions of the object during printing.
  • the support material also may be needed post- printing/pre-curing (or annealing). This support material buttresses the object to prevent issues like sagging.
  • finishing refers to removing unwanted material from a 3D-printed object so as to produce a finished part.
  • Finishing can include one or more processes, including, but not limited to, removing unwanted resin, removing unwanted metal powder, removing unwanted print material, and/or removing unwanted support material. In the 3-D printing industry, finishing may be referred to as“cleaning.”
  • the support material itself can have a complex geometry and can also be extensive, because it may support the object at a plurality of locations. Additionally, because additive manufacturing prints an object in discrete layers, the surface finish of an object is often rough because edges of the layers do not always align with each other, thus creating a rough, bumpy outer surface. This outer surface is unappealing from a visual standpoint and creates stress concentrations, which could result in cracks during testing or use, and thus lead to a premature failure if the rough surface is not made smooth during finishing. [0004] Some finishing solutions are organic based and often contain isopropanol
  • IPA IPA
  • TPM tripropylene glycol methyl ether
  • liquid finishing solutions that chemically act on an object to finish the object
  • Such a finishing solution may be used with or without mechanical finishing and/or force.
  • finishing solutions that may be used for removing unwanted resin (e.g., finishing) from a stereolithographic (“SLA”) 3D-printed object.
  • SLA stereolithographic
  • Such a finishing solution may comprise:
  • water e.g., the remainder of this finishing solution is water.
  • One such method may comprise:
  • Another such method may comprise: (a) spraying an object or a portion thereof in a finishing solution, such as, for example, the solution described above; and
  • Figure 1 A and Figure 1 B are each a photo of a 3D-printed object (a rook) prior to finishing.
  • Figure 1 A shows the base and side of the object
  • Figure 1 B shows the top and side of the object.
  • Figure 1C and Figure 1 D are each a photo of the same 3D-printed object (the rook) after applying a finishing solution that is in keeping with the invention.
  • Figure 1 C shows the base and side of tire object
  • Figure ID shows the top and side of the object.
  • Figure 2 (A) is drawing of a machine that can be used to finish a 3D-prmted object with a finishing solution that is in keeping with the invention and (B) a cross-sectional view of the machine depicted in Figure 2A.
  • the numbers in Figures 2 A and 2B identify: a support removal machine (100), a control panel (12), a lid (10), a front panel (8), a tank holding a finishing solution that is in keeping with the invention (28), a weir (20), computer (13), an input tank (18), an input tank liquid level (19), a liquid level sensor (26), an overflow across wall (36), an ultrasonic generator (70), and ultrasonic transducers (22).
  • Figure 3 shows a flow diagram of a method of using a finishing solution in keeping with the invention.
  • Ranges of values are disclosed herein.
  • the ranges set out a lower limit value (“LEV”) and an upper limit value (“ULV”).
  • LLV, ULV, and all values between the LLV and ULV are part of the range.
  • the present disclosure provides finishing solutions tor removing unwanted resin from a 3D printed stereolithography (SLA) object and thereby weakening any support material that was associated with the removed resin.
  • 3D printed objects are frequently partially cured to increase their rigidity prior to finishing.
  • the resin/material that was not cured may be dissolved by a finishing solution of the present invention before the object is placed into an ultraviolet (“UV”) oven for final curing.
  • UV ultraviolet
  • support material refers to material that is operatively arranged to support portions of an object during an additive manufacturing process to create the object, but which is unwanted once the manufacturing process is complete.
  • Support material and/or unwanted resin can be the same material as the object which is being manufactured, or can be a different material.
  • Materials that can be removed during finishing include, but are not limited to, accura 25, accura 60, ClearVue, FORMLABS* (e.g., Clear, White, Tough, Castable, Flexible, Dental SO, and the like) photopolymer resin, and the like.
  • die term“agitated” refers to effecting fluid movement by an outside force.
  • Non-limiting examples of agitation include moving finishing solution via a pump, stirring, using longitudinal waves at an ultrasonic frequency, or combinations thereof.
  • finishing processes are mechanical in nature (e.g., abrasion techniques, such as sanding), some are chemical in nature, and others are a combination of mechanical processes and chemical processes.
  • an unfinished 3D- printed object may be subjected to a process to remove unwanted support material and/or unwanted resin, and thereby provide a finished part.
  • the object is placed in a tank (e.g., submerged or at least partially submerged) that has been filled (e.g, filled at least partially) with a liquid finishing solution. While the object is in the finishing solution (e.g uneven submerged or at least partially submerged in the finishing solution), the object may be subjected to mechanical agitation, abrasion, and/or heating in order to remove unwanted resin from the object.
  • Mechanical agitation may occur by moving the liquid finishing solution (e.g., via a pump) and1 ⁇ 2 by using ultrasound.
  • the object is subjected to a liquid spray.
  • the object is placed in a chamber, and a pump is used to force the liquid finishing solution through one or more nozzles, which apply the finishing solution to the object and mechanically agitates the part.
  • the liauid often includes chemical solvents to dissolve support material and/or unwanted resin, and thereby create a finished or nearly finished form of the object.
  • Heat from a heat source may be used to maintain the finishing solution at a desired temperature. Under these conditions the support material and/or unwanted resin may be removed thermally, chemically, mechanically or via a combination of two or more of these general methods.
  • a finishing solution that is in keeping with the invention may be a mostly aqueous finishing solution for removing resin (e.g., finishing of) from an SLA 3D-printed object, build tray, or build plate.
  • the finishing solution may comprise:
  • water e.g., the remainder of this finishing solution is water.
  • a terpene in a finishing solution that is in keeping with the invention may aid in dissolving organics found in resins frequently used in SLA printing techniques.
  • tcrpenes suitable for a finishing solution in keeping with the invention include, but are not limited to, D-Iimonene, dipentene, terpinenes, menthol, pinene, thymol, boraeol,
  • a finishing solution that is in keeping with the invention may be 1 -20% by weight a teipene, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • a hydrotrope in a finishing solution that is in keeping with the invention may aid in solubilizing organic materials (e.g., the organic components of a finishing solution and resins) in water.
  • organic materials e.g., the organic components of a finishing solution and resins
  • hydrotropes suitable for a finishing solution that Is in keeping with the invention include, but are not limited to, sodium xylene sulfonate (“SXS”), xylene sulfonic acid, calcium xylene sulfonate, potassium xylene sulfonate, cumene sulfonic acid, sodium cumene sulfonate, toluene sulfonic acid, sodium toluene sulfonate, and combinations thereof.
  • SXS sodium xylene sulfonate
  • xylene sulfonic acid xylene sulfonic acid
  • calcium xylene sulfonate calcium xylene
  • Hydrotropes can be aqueous solutions comprising 1-50% hydrotrope by weight, including all 1% values and ranges therebetween. Such hydrotropes can be a mixture of isomers (e.g., stereoisomers, constitutional isomers, and the like).
  • a finishing solution that is in keeping with the invention may be 0.001-20% by weight a hydrotrope, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • a glycol ether in a finishing solution that is in keeping with the invention can aid in dissolving organics found in resins that are typically used in SLA printing techniques.
  • glycol ethers suitable for a finishing solution include, but are not limited to, methoxytriglyco I , ethoxytriglycol, butoxytriglycol, diethylene glycol n-butyl ether acetate, diethylene glycol monobutyl ether, ethylene glycol n-butyl ether acetate, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, DOWANOLTMDPH 255, ethylene glycol phenyl ether, diethylene glycol monohexyl ether, ethylene glycol monohexyl ether, diethylene glycol monomethyl ether, ethylene glycol monopropyl ether, dipropylene glycol methyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol n-but
  • a finishing solution that is in keeping with the invention may be 1-10% by weight a first glycol ether, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • a finishing solution that is in keeping with the invention may be 1-10% by weight a second glycol ether, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • a finishing solution that is in keeping with the invention may comprise a combination of two glycol ethers, where the amount (e.g., by weight) of each glycol ether is the same or different
  • a finishing solution can comprise dipropylene glycol monomethyl ether (DPM) and ethylene glycol monobutyl ether (EB).
  • An emulsifier in a finishing solution that is in keeping with the invention can aid in sustaining the length of time before such a finishing solution separates into organic and aqueous layers.
  • emulsifiers include, but are not limited to, polysorbate 20, polysorbate 40, polysorbate 60, polysorbate 80, sodium caprylate, and combinations thereof.
  • a finishing solution that is keeping with invention may be 1 -5% by weight an emulsifier, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • a caustic agent in a fmisMng solution that is in keeping with the invention can aid in increasing the pH of such a finishing solution.
  • caustic agents examples include, but are not limited to, sodium metasilicate pentahydrate, anhydrous sodium silicate, potassium silicate, potassium hydroxide, sodium hydroxide, and combinations thereof.
  • a finishing solution that is keeping with invention may be 1-15% by weight a caustic agent, including all 0.1% values and ranges therebetween, relative to the total weight of the finishing solution.
  • Caustic agent(s) may be added to a finishing solution to adjust the pH.
  • a finishing solution of the present invention may have a pH of 10-14.
  • finishing solution can comprise:
  • water e.g., the remainder of this finishing solution is water.
  • Such a finishing solution may have a pH of 10-14, including all 0.1 pH values and ranges therebetween.
  • the finishing solution can comprise:
  • Such a finishing solution has a pH of 10-14, including all 0.1 pH values and ranges therebetween.
  • the in vention may be embodied as a method of using a finishing solution.
  • the steps of such a method may be sufficient to remove unwanted resin from a 3D-printed object, build plate, or build tray.
  • the method can comprise: (a) to an object or a portion thereof, applying (e.g., by submerging the object) a finishing solution of the present invention;
  • Another method may comprise:
  • applying the finishing solution may be accomplished by submerging in the finishing solution all or part of the object that requires finishing.
  • the word‘'submerged 1 ' refers to a situation where the object or merely a portion of the object is submerged at a depth sufficient to cover the object or portion thereof that requires finishing.
  • the finishing solution can be stored in a holding vessel/eomainer/tank.
  • Non-limiting examples of materials that the holding vessel/container/tank may be made from include stainless steel, glass, high density polyethylene, Teflon, Kalrez, Poly vinylidene
  • PVDF Vinyl Fluoride
  • Agitation can be induced by methods such as, but are not limited to, sonication
  • a pump e.g., using a pump to effect fluid movement
  • stirring or a combination thereof.
  • Sonication may be performed at 0 to 1750 W, including all 0.1 W values and ranges therebetween, where amplitude may vary, and at a frequency of 20-100 kHz, including all 0.1 kHz values and ranges therebetween. In a preferred example, the frequency is 40 kHz.
  • Sonicating a finishing solution that is in keeping with the invention can agitate the finishing solution such that the finishing solution does not separate into distinct phases and/or such that a force (e.g., friction across one or more surfaces of the object) is applied to the object, or to move the finishing solution.
  • Such a finishing solution can be agitated for 1 60 minutes, including all 1 second values and ranges therebetween, prior to the object being submerged, and/or while the object is submerged.
  • Agitation by a pump can include pumping a finishing solution into a tank containing the object.
  • a pump may pump finishing solution into a tank at a rate of 1-20 gallon/minute, including all 0.1 gallon/minute value and range therebetween.
  • an equal amount of finishing solution may be made to flow out of the tank over a weir and through a filtered drain.
  • the force of die solution entering the filled tank mixes the finishing solution.
  • a finishing solution may be agitated for 1 -60 minutes, including all l second values and ranges therebetween, prior to the object being submerged and/or while the object is submerged and/or while die object Is submerged.
  • Stirring can be performed by the use of an impeller, mechanical stirrer, stir bar, or the like.
  • a finishing solution can be agitated for 1-60 minutes, including all 1 second values and ranges therebetween, prior to the object being submerged and/or while the object is submerged.
  • any other method to induce fluid movement may be suitable to induce such agitation.
  • An object may be submerged (completely or partially) in a finishing solution that is in keeping with the invention and agitated during at least part of the submersion.
  • An object may be submerged for a time sufficient to remove unwanted resin.
  • the finishing solution may be agitated during the entire time of submersion or during part of the time that the object is submerged.
  • the amount of time can be 1-60 minutes, including all 1 second values and ranges therebetween. The amount of time an object is submerged depends on the geometry of the object. That is, more complicated geometries may require additional submersion times.
  • an object can be adequately finished by submerging the object for a time that is between 1 and 30 minutes, including all I second values and ranges therebetween, and the finishing solution may be agitated for the entire duration of submersion or during part of the time that the object is submerged.
  • Agitation of the finishing solution induced by stirring, a pump, and/or other methods may create friction between the finishing solution and the object being finished thereby causing removal of unwanted resin.
  • Removal of the unwanted resin may be enhanced by ultrasonic transducers placed in the tank, such that the finishing solution vibrates, which is then imparted into the part.
  • the ultrasonic transducers may be oriented tangentially (i.e., arranged on the side of the tank, where the transducers are tangential to the rotational flow in the tank) to the object such that efficient agitation is achieved when the part is oriented in any direction is achieved.
  • the vibrating finishing solution may enhance removal of support material and/or unwanted resin by causing cavitation through direct interaction with the object. Such cavitation may be useful because cavitation enhances removal of unwanted support material and/or unwanted resin.
  • the temperature of the finishing solution may be kept at a desired
  • the finishing solution may be kept at a temperature of 55 -105 °F, including all 0.1 °F values and ranges therebetween, before the object is submerged and/or while the object is submerged.
  • a finishing solution that is in keeping with the invention can be recovered after the finishing operations are concluded.
  • Steps for recovering the finishing solution may include allowing finishing solution to drip from the object back into a tank containing the finishing solution.
  • the object may be rinsed with water or a similar solvent/solution. Such rinsing may be necessary to remove finishing solution that remains on the object Following application of the finishing solution, the object may be rough and tacky.
  • T ackiness is related to uncured resin left on the surface. Such determination for roughness and/or tackiness may ⁇ be determined by personal/operator preference. Such a determination can be made by personal/operator touch.
  • the method may be repeated until the desired roughness and/or tackiness is/are achieved.
  • the operator may determine that the object no longer requires additional finishing.
  • a general method of use can include:
  • machine e.g., a machine used for finishing a 3-D printed object
  • Prolonged submersion in the finishing solution weakens the support material substantially by facilitating dissolution the unwanted resin.
  • Fluid flow and ultrasonic agitation provide some mechanical force to loosen weakened support material, while also facilitating dissolution of uncured material (e.g., support material and/or resin).
  • a method of using a finishing solution that is in keeping with the invention may be accomplished by using a machine, such as, for example, the Post Process DEMI ( Figure 2 shows a simplified schematic of a DEMI), CENT!, NANO, or PICO.
  • a machine such as, for example, the Post Process DEMI ( Figure 2 shows a simplified schematic of a DEMI), CENT!, NANO, or PICO.
  • Some machines such as the Post Process NANO or the Post Process PICO, do not reoplanetary a pump. However, additional agitation, such as from a pump, can reduce the amount of time needed to remove unwanted support material and/or unwanted resin.
  • Using such a machine can involve:
  • finishing solution e.g., mixing may be performed by a pump and/or
  • the machine may be filled with finishing solution using an automated filling feature having a pump and reservoir.
  • a liquid level sensor may be positioned in the tank. When signals from that .sensor indicate the liquid level is too low, a pump may be caused to move fluid from the reservoir to the tank.
  • the solution should be premixed before being added to the reservoir, in addition, the finishing solution may need to be mixed after the finishing solution has been added to the machine in order to prevent separation of the components.
  • a method of removing support material and/or unwanted resin may include placing a 3D-printed object within a tank of a machine, such as, for example, depicted in Figure 2B, which shows a simplified schematic of a Post Process DEMI machine.
  • a desired run time may be determined and/or selected, and the pump started so that the finishing solution is circulated through the tank by the pump.
  • the method can involve:
  • the ultrasonic waves may be provided at a selected first agitation frequency.
  • Ultrasonic waves reflecting off of the object may be detected by a sensor, and the amplitude of the reflected waves may be measured. Based on the measured amplitude, a second ultrasonic frequency may be selected, for example, using database analysis from prior tests, zeroed in benchmarking procedures, and/or optimization techniques, and then ultrasound waves having the selected second ultrasonic frequency may be directed at the object
  • the amplitude of the reflected ultrasonic waves may be detected by a sensor. This process may be repeated until the detected amplitude indicates that a resonant frequency of the support material and/or unwanted resin has been reached. As support material and/or unwanted resin is removed, the resonant frequency of the remaining support material and/or unwanted resin may change, and so the process of selecting an ultrasonic agitation frequency may need to be repeated from time to time.
  • the object When the desired run time has been reached, the object may be removed from the tank and inspected to determine whether additional run-time is needed. Additional runtime may be needed if the object is“tacky” or too rough.
  • the finishing solution may be applied to the object by spraying the finishing solution on the object.
  • Spraying can include using a machine capable of spraying the object or using a .spray bottle (e.g., a bottle having an atomizer nozzle).
  • finishing of the object can be performed on a bench top using a mixer (e.g., a stir plate and magnetic stir bar or a mechanical stirrer and a tank (e.g., a flask or beaker) to hold the finishing solution (and object being finished).
  • a mixer e.g., a stir plate and magnetic stir bar or a mechanical stirrer and a tank (e.g., a flask or beaker) to hold the finishing solution (and object being finished).
  • This example describes a method of using a finishing solution that is in keeping with the invention.
  • the object in Figure 1 A and Figure IB was printed by SLA processes known in the art.
  • the object ( Figure 1 A and Figure I B) was finished using a finishing solution having:
  • That finishing solution had a pH of about 10-14.
  • a finishing machine called a Post Process Nano (“PPN”) was used.
  • the holding tank of the PPN was filled with the finishing solution, and the object was placed in the finishing solution.
  • 13 ⁇ 4e finishing solution was heated to a temperature of 70 °F and the finishing solution was agitated via ultrasonic transducers for 5 minutes at room temperature and 40 kHz. After 5 minutes, the object was removed from the finishing solution and rinsed with water.
  • the finished object is shown in Figure 1C and Figure ID.

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

L'invention concerne des solutions de finition fluidique destinées à éliminer une résine et/ou un matériau de support indésirables d'un objet imprimé en 3D, tel qu'un objet produit par stéréolithographie. Les compositions sont des solutions aqueuses contenant un terpène, un hydrotrope, au moins un éther de glycol, un émulsifiant et un agent caustique. L'invention concerne en outre des procédés d'utilisation des solutions de finition.
PCT/US2018/028674 2018-04-20 2018-04-20 Compositions destinées à éliminer la résine d'un objet imprimé en 3d et procédés de fabrication et d'utilisation de ces dernières WO2019203852A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022093956A1 (fr) * 2020-10-30 2022-05-05 Postprocess Technologies, Inc. Compositions pour l'élimination de résine et de céramique d'une surface d'un objet et procédés d'utilisation de telles compositions
US11396608B2 (en) 2018-06-26 2022-07-26 Postprocess Technologies, Inc. Compositions for removing support material from a 3D-printed object and methods of making thereof
EP4126421A4 (fr) * 2020-03-27 2024-04-17 Postprocess Tech Inc Compositions pour éliminer un matériau non souhaité d'un objet et procédés d'utilisation de telles compositions

Citations (7)

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US5248456A (en) * 1989-06-12 1993-09-28 3D Systems, Inc. Method and apparatus for cleaning stereolithographically produced objects
US20050199272A1 (en) * 1999-04-20 2005-09-15 Ecolab Inc. Composition and method for road-film removal
US20060219276A1 (en) * 2005-04-01 2006-10-05 Bohnert George W Improved method to separate and recover oil and plastic from plastic contaminated with oil
US20090211616A1 (en) * 2003-11-19 2009-08-27 David Jonathan Tafoya Apparatus for removing water-soluble support material from one or more rapid prototype parts
US20140147395A1 (en) * 2012-11-29 2014-05-29 Segetis, Inc. Carboxy ester ketals, methods of manufacture, and uses thereof
US20140298577A1 (en) * 2012-07-16 2014-10-09 Reckitt Benckiser Llc Self-adhesive lavatory treatment compositions
WO2018031491A1 (fr) * 2016-08-07 2018-02-15 Nanochon, Llc Échafaudages d'ingénierie tissulaire imprimés en trois dimensions pour la régénération tissulaire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5248456A (en) * 1989-06-12 1993-09-28 3D Systems, Inc. Method and apparatus for cleaning stereolithographically produced objects
US20050199272A1 (en) * 1999-04-20 2005-09-15 Ecolab Inc. Composition and method for road-film removal
US20090211616A1 (en) * 2003-11-19 2009-08-27 David Jonathan Tafoya Apparatus for removing water-soluble support material from one or more rapid prototype parts
US20060219276A1 (en) * 2005-04-01 2006-10-05 Bohnert George W Improved method to separate and recover oil and plastic from plastic contaminated with oil
US20140298577A1 (en) * 2012-07-16 2014-10-09 Reckitt Benckiser Llc Self-adhesive lavatory treatment compositions
US20140147395A1 (en) * 2012-11-29 2014-05-29 Segetis, Inc. Carboxy ester ketals, methods of manufacture, and uses thereof
WO2018031491A1 (fr) * 2016-08-07 2018-02-15 Nanochon, Llc Échafaudages d'ingénierie tissulaire imprimés en trois dimensions pour la régénération tissulaire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396608B2 (en) 2018-06-26 2022-07-26 Postprocess Technologies, Inc. Compositions for removing support material from a 3D-printed object and methods of making thereof
EP4126421A4 (fr) * 2020-03-27 2024-04-17 Postprocess Tech Inc Compositions pour éliminer un matériau non souhaité d'un objet et procédés d'utilisation de telles compositions
WO2022093956A1 (fr) * 2020-10-30 2022-05-05 Postprocess Technologies, Inc. Compositions pour l'élimination de résine et de céramique d'une surface d'un objet et procédés d'utilisation de telles compositions

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