49 results about "Stereolithographies" patented technology

A footwear includes: a foot bed portion that supports a sole of a foot of a wearer and has a ground contact surface; and a foot cover portion that covers an instep of the foot of the wearer. At least a part of the foot bed portion and at least a part of the foot cover portion are formed of a single additively manufactured product produced by a stereolithography-type three-dimensional additively manufacturing method, and a protruding portion is provided on an outer surface defined by the additively manufactured product of the foot cover portion.

Provided is an ultraviolet-curable silicone composition for stereolithography comprising: (A) organopolysiloxane having two groups indicated by formula (1) in a molecule (in the formula, R1 represents a monovalent hydrocarbon group, R2 represents an oxygen atom or an alkylene group, and R3 represents an acryloyloxyalkyl group, a methacryloyloxyalkyl group, an acryloyloxyalkyloxy group, a methacryloyloxyalkyloxy group, a (acryloyloxyalkyl) dimethylsilyloxy group, or a (methacryloyloxyalkyl) dimethylsilyloxy group, where p represents a number satisfying 0 ≤ p ≤ 10, and a represents a number satisfying 1 ≤ a ≤ 3); (B) hydrophobic silica particles having an average particle diameter of 10-1,000 nm and a degree of hydrophobicity of 60% or more by a methanol titration method; and (C) a photopolymerization initiator.

The present disclosure provides a device manufacturing process comprising designing a mold for stereolithography resin printing, wherein the mold is configured to minimize distortion from pyrolysis and sintering, printing the mold from resin using stereolithography, pyrolyzing the mold to convert resin into carbon structure, filling the carbon structure with ceramic slurry, drying the ceramic slurry within the carbon structure, and thermally processing the carbon structure and ceramic slurry to decompose the carbon structure and sinter the ceramic slurry into consolidated ceramic part. The ceramic slurry may comprise hydroxyapatite or yttria-stabilized zirconia particles. The mold design may limit beam thickness and wall thickness to 0.6mm and account for isotropic shrinkage of approximately 50% during pyrolysis. Thermal processing may involve sintering at 1200°C for hydroxyapatite or 1450°C for yttria-stabilized zirconia to produce ceramic scaffolds with sub-millimetric channels and intricate lattice structures for biomedical applications.

The present disclosure provides systems and methods for printing three-dimensional (3D) objects. In an aspect, the present disclosure provides a method of determining a complexity of a portion of a 3D object and applying adaptive smoothing during the printing of the portion of the 3D object.

To provide a chemical mechanical polishing pad.SOLUTION: A chemical mechanical polishing pad comprises a polishing layer containing a photocured polymer. The photocured polymer is the photoinitiated reaction product of a photocurable material that is free of molecules comprising (meth)acrylate groups. The photocurable material comprises molecules having two or more functional groups. The functional groups include a thiol group and ethylenically unsaturated group other than a (meth)acrylate group. The photocure includes reaction of the thiol group with the ethylenically unsaturated group. At least some of the molecules comprise three or more functional groups. The chemical mechanical polishing pad can be made by additive manufacturing using stereolithography.SELECTED DRAWING: None

To provide a chemical mechanical polishing pad.SOLUTION: A chemical mechanical polishing pad comprises a photocured polymer. The photocured polymer is the photoinitiated reaction product of a photocurable material comprising molecules having two or more functional groups. The functional groups include a thiol group and an ethylenically unsaturated group. For at least a portion of the molecules having the ethylenically unsaturated group, the ethylenically unsaturated group is a (meth)acrylate group. The (meth)acrylate groups comprise less than 70 mol% of total (meth)acrylate, thiol, and ethylenically unsaturated functional groups. The photocure includes reaction of the thiol group with the ethylenically unsaturated group. At least some of the molecules comprise three or more functional groups. The chemical mechanical polishing pad can be made by additive manufacturing using stereolithography.SELECTED DRAWING: Figure 1

A computer-implemented method includes generating a digital simulation model of an object, identifying portions of the object for physical prototyping based on confidence scores derived from the digital simulation model and creating a stereolithography (STL) model for the portions. Three-dimensional (3D) printing of the portions is performed based on the STL model. Physical testing is performed on 3D printed portions, and the digital simulation model is updated based on results of the physical testing.

The invention relates to a deformable absorbent substrate for a packaging and / or application assembly for a cosmetic product, having cells defined by ridges. The ridges may be created in particular by means of additive manufacturing, in particular by selective laser sintering, selective laser fusion, stereolithography, or fused filament fabrication.

Stereolithography device (1) for producing a three-dimensional object, comprising: an exposure device (20) for exposing a photocurable material according to an exposure pattern generated in advance on the basis of three-dimensional shape data; and a control device (C) for controlling the operation of the stereolithography device (1), wherein the exposure device (20) comprises: a projector (21) comprising a plurality of pixels (PXL) in a two-dimensional array and adapted to individually switch ON-OFF states of exposure light at the respective pixels (PXL), wherein the projector (21) is movable in a second direction (y) orthogonal to a first direction (x) in a posture inclined with respect to the second direction (y), so that center positions of two adjacent pixels (PXL) of the plurality of pixels (PXL) are spaced from each other by a predetermined character pitch (Re) in the first direction (x), and is adapted to switch the ON-OFF states of the exposure light each time the projector (21) moves by a distance corresponding to the character pitch (Re) in the second direction (y), and the control device (C) causing the projector (21) to expose the light-curable material in a predetermined character area successively for a plurality of stripe areas (L) each extending in the second direction (y) and having a predetermined character width in the first direction (x) by individually switching the ON-OFF states of the exposure light at the respective pixels on the basis of the exposure pattern while alternating a forward movement and a backward movement in the second direction (y) with an intermediate step movement in the first direction (x), and in a case where a plurality of layers of the photocurable material are each exposed by the exposure device (20) while being stacked on top of one another to obtain the three-dimensional object, forming a connecting portion (JT) of two adjacent stripe regions (L) of the plurality of stripe regions (L) by overlapping the adjacent stripe regions (L) along the first direction (x) and causing an in-plane position of the connecting portion (JT) to differ between at least two layers of the plurality of layers.

The objective of the present disclosure is to enhance resolution in at least a propagation direction of promotion light in a stereolithographic technique using a liquid phase polymerization method. A stereolithographic method according to the present disclosure includes: a region defining step (S11) of defining a first region to be irradiated with promotion light on a molding surface set inside a photocurable resin and a second region to be irradiated with inhibition light; and an irradiation step (S13) of irradiating the first region with the promotion light having a wavelength λ1 which is n times (n is an integer of 2 or more) greater than a first absorption wavelength included in the absorption band of the polymerization initiator, and irradiating the second region with the inhibition light having a wavelength λ2 which is a second absorption wavelength included in the absorption band of the polymerization inhibitor. In the irradiation step, the polymerization initiator is activated by n-photon absorption of photons of the promotion light.

The invention provides a method for obtaining patterned adherent cells, which comprises the following steps of: covering the surfaces of the adherent cells with a solution containing photo-initiated photosensitive hydrogel, carrying out patterning treatment on an obtained hydrogel system through stereolithography, and removing an uncured hydrogel part and cells which are not protected by the cured hydrogel to obtain the patterned adherent cells. And finally, removing the cured hydrogel to obtain the adherent cells subjected to patterned culture. According to the method, the sacrificial phase hydrogel protective layer is manufactured in combination with a photoetching method, the adherent cells do not need to be resuspended again, the cell pollution risk possibly introduced in a traditional method is avoided, in-situ arrangement and shape control of the adherent cells can be achieved, and adherent cell communities with regular or complex patterns can be formed.

The invention discloses a nozzle blowing and filling integrated multi-material supply mechanism and method for ceramic photocuring additive equipment. The nozzle blowing and filling integrated multi-material supply mechanism and method are used for solving the problems that in a stereolithography SLA / spray deposition DIW composite multi-material printing process, the supply efficiency of multiple materials is low, and the forming speed is low. Comprising a linear module, an installation assembly, a fine adjustment assembly, a telescopic assembly, a material spraying nozzle and an air spraying nozzle, the linear module is fixed to a guide rail of the printer, the fine adjustment assembly is connected with the linear module through the installation assembly and moves up and down along the linear module, the fine adjustment assembly has vertical telescopic performance, and the material spraying nozzle is fixed to a movable part of the fine adjustment assembly; the air injection nozzle is connected with the material injection nozzle through the telescopic assembly, the telescopic assembly has transverse flexibility, and the distance between the air injection nozzle and the material injection nozzle is adjusted through the telescopic assembly. The material spraying nozzles are transversely arranged side by side, space cooperative movement is achieved, the printing path and the material extrusion amount are adjusted in real time, and the layer-by-layer progressive filling effect is achieved through side-by-side printing.

A curable composition for stereolithography, comprising a photopolymerizable component and a photopolymerization initiator, wherein a cured product of the curable composition has a minimum value of a storage elastic modulus, in a range of from 25° C. to 300° C., of not greater than 1.20×107 Pa.

In additive manufacturing operations, powders used in stereolithographic processes need to be precisely spread out in a uniform fashion at every pass of the stereolithographic process to ensure predictability in powder surface morphology. Typically, this is difficult to achieve with conventional powders because often these powders suffer from poor flowability, which may further deteriorate over time, and impairs the efficiency of the stereolithographic processes. The present disclosure describes additive manufacturing powders having improved physical characteristics such as flowability and tap density, which are less sensitive or insensitive to ambient humidity. For example, there is described a powder that includes spherical particles having a particle size distribution of less than 1000 micrometers and having a measurable flowability as determined in accordance with ASTM B213 at 75% relative humidity.

To provide a cationic polymerization initiator that absorbs wavelengths in a long-wavelength region of 385 to 405 nm and achieves a superior monomer conversion ratio, and a composition for optical stereolithography using the same.SOLUTION: A composition for optical stereolithography comprises a cationically polymerizable compound having a glycidyl ether structure, and a cationic polymerization initiator that is an aromatic sulfonium salt represented by the following structural formula (where X- denotes a monovalent anion).SELECTED DRAWING: Figure 7

The invention relates to a component (1) of an eyeglass frame and a method for additive manufacturing of such a component (1) by means of stereolithography, wherein the component (1) comprises at least one eyeglass frame (3) having an inner edge (10), wherein an inner support structure (12) is manufactured together with the eyeglass frame (3) in order to support the eyeglass frame (3), wherein the inner support structure (12) of the manufactured component (1) is connected to the inner edge (10) at at least two opposing points (14) in such a way that these points (14) are supported relative to one another, wherein a surface (5) of the component (1) has at least one connection region (7), wherein the connection region (7) is concealed in the position of use of the finished eyeglass frame, wherein an outer support structure (9) is provided, which is manufactured together with the component (1), wherein a connection between the outer support structure (9) and the component (1) is established in the connection region (7), wherein the manufacturing of the inner support structure (12) is started as soon as the connection between the outer support structure (9) and the component (1) has been established.

The invention relates to a stereolithography method comprising the steps of: containing a photo-hardening suspension (100) with filler particles (103) in a vat (105); setting the photo-hardening suspension to a layer thickness smaller than the diameter of the filler particles (103) with respect to the bottom (109) of the vat (105) by means of a structure platform (107); and selectively hardening the set layer thickness of the suspension by means of light.

The present invention relates to a plate denture production kit for stereolithography including a curable composition for a denture base (I) containing a (meth)acrylic based polymerizable monomer component (A) containing a (meth)acrylic based polymerizable monomer (m) as a major monomer, and a photopolymerization initiator, and a composition for a prosthetic tooth (II) containing a (meth)acrylic based polymerizable monomer component (B) containing the same (meth)acrylic based polymerizable monomer (m) as contained in the curable composition for a denture base (I), having a content of the (meth)acrylic based polymerizable monomer (m) of 20% by mass or more based on 100% by mass of the (meth)acrylic based polymerizable monomer component (B), and a method of producing a plate denture.

A stereolithography method is provided for the production of a three-dimensional object through the superimposition of layers. The method includes: application of a base substance to a supporting surface belonging to a first laminar element and to a second laminar element; selective irradiation of a layer with a predefined thickness of the base substance in contact with the supporting surface in such a way as to obtain a solidified layer; separation of the solidified layer from the supporting surface through a movement intended to move them away from each other. The application of the base substance is carried out by depositing a single layer with thickness at least corresponding to the predefined thickness so that it comes into contact with the second laminar element at least in the areas corresponding to the volume of the three-dimensional object to be obtained.

A method of separating excess resin from at least one object, includes: (a) stereolithographically producing at least one object on at least one carrier platform, each carrier platform having a planar build surface to which at least one object is connected, each object carrying excess resin on a surface thereof; then (b) mounting each carrier platform to a rotor; (c) centrifugally separating excess resin from each object by spinning the rotor with each carrier platform connected thereto while each object remains connected to each carrier platform; and then (d) removing each carrier platform from the rotor with each object thereon, with excess resin separated therefrom.

A stereolithography method of manufacture of a polymer structure having a spatially gradient dielectric constant, including: providing a volume of a liquid, radiation-curable composition; irradiating a portion of the liquid, radiation-curable composition with activating radiation in a pattern to form a layer of the polymer structure; contacting the layer with the liquid, radiation-curable composition; irradiating the liquid, radiation-curable composition with activating radiation in a pattern to form a second layer on the first layer; and repeating the contacting and irradiating to form the polymer structure, wherein the polymer structure comprises a plurality of unit cells wherein each unit cell is integrally connected with an adjacent unit cell, each unit cell is defined by a plurality of trusses formed by the irradiation, wherein the trusses are integrally connected with each other at their respective ends, and the trusses of each unit cell are dimensioned to provide the spatially gradient dielectric constant.

Described are 3D printing platforms comprising stereolithographic 3D printing devices utilizing a static optical assembly and procedural modeling applications representing 3D scenes as signed distance function. Described are also structures such as bioreactors that can be printed using such platforms, as well as characteristics and used thereof.

A stereolithography device (1A) comprises: a first light source (101) that outputs first light (L1); a second light source (102) that outputs second light (L2); a spatial light modulator (DMD103) that is controlled to have a first modulation pattern in a first state and to have a second modulation pattern in a second state; an optical path changing optical system (110) that changes optical paths of the first light (L1) and the second light (L2) such that the first light (L1) is incident on the spatial light modulator (DMD103) in the first state and the second light (L2) is incident on the spatial light modulator (DMD103) in the second state; and an irradiation optical system (imaging lens 104, aperture stop 105, beam splitter 106, and first objective lens 107) that irradiates a molding surface (S) with the first light (L1) in a first irradiation pattern in the first state and irradiates the molding surface (S) with the second light (L2) in a second irradiation pattern in the second state.

A method for making a stereolithographic object, including: releasing at least one fastener immobilizing at least one joint between a fabrication platform and bracket to which the fabrication platform is pivotably attached, such that the fabrication platform is pivotable with respect to the bracket; unreleasing the at least one fastener; disposing a radiation hardenable material into a vessel for receiving a radiation hardenable material and having an actinic radiation transparent portion transparent to the actinic radiation; operating an actinic radiation source to generate the actinic radiation; illuminating with the actinic radiation the radiation hardenable material through the actinic radiation transparent portion, the actinic radiation transparent portion being intermediate the stereolithographic radiation source and the fabrication platform; and translating the bracket towards the vessel and away from the vessel.

Provided is a UV-curable silicone composition for stereolithography, the UV-curable silicone composition containing: (A) an organopolysiloxane having, per molecule, two or more radically polymerizable group-containing groups each bonded to a silicon atom via an oxygen atom directly bonded to the silicon atom (excluding those containing a heteroatom other than an oxygen atom); (B) hydrophobic silica particles having an average particle size of 10-1,000 nm and having a hydrophobicity of 60% or more as measured by a methanol titration method; and (C) a photopolymerization initiator, wherein when the composition is irradiated with ultraviolet light having a wavelength of 405 nm at 25°C at a dose of 8,000 mJ / cm2, and then cured for 24 hours in an environment of 85°C and 85% RH to obtain a cured product having a thickness of 2.0 mm, the cured product has a tensile strength of 4.5 MPa or more and an elongation at break of 300% or more.

Provided is method of making a three-dimensional object comprising polyurea, which may include: (a) dispensing a one part (1K) dual cure resin into a stereolithography apparatus, the resin comprising or consisting essentially of a photoinitiator, a reactive blocked polyisocyanate, optionally a catalyst such as a polyurethane blowing catalyst, and optionally a polyepoxide; (b) additively manufacturing from said resin an intermediate object comprising the light polymerization product of said reactive blocked polyisocyanate; (c) optionally cleaning said intermediate object; and (d) reacting said polymerization product in said intermediate with water in the presence of a catalyst such as a polyurethane blowing catalyst (which may be included in the resin, the water, or both) to generate polyamine in situ that sequentially reacts with the remainder of the polymerization product to form urea linkages and thereby produce a three-dimensional object comprising polyurea. Dual cure resins useful for the method are also provided.

Provided is a UV-curable silicone composition for stereolithography, the UV-curable silicone composition containing: (A) an organopolysiloxane having, per molecule, two or more radically polymerizable group-containing groups each bonded to a silicon atom via an oxygen atom directly bonded to the silicon atom (excluding those containing a heteroatom other than an oxygen atom); (B) hydrophobic silica particles having an average particle size of 10-1,000 nm and having a hydrophobicity of 60% or more as measured by a methanol titration method; and (C) a photopolymerization initiator, wherein when the composition is irradiated with ultraviolet light having a wavelength of 405 nm at 25°C at a dose of 8,000 mJ / cm2, and then cured for 24 hours in an environment of 85°C and 85% RH to obtain a cured product having a thickness of 2.0 mm, the cured product has a tensile strength of 4.5 MPa or more and an elongation at break of 300% or more.

A method for forming a patient-specific implant (PSI) part for application to a resected body part to form a reconstructed part involves utilizing a StereoLithography (STL) model of the reconstructed part with trace lines and the location of screw holes for screws to fasten the PSI to the resected body part in forming the reconstructed part. The trace lines are processed using cubic-spline data interpolation and smoothing, followed by the generation and transformation of rectangles to create a skeleton that forms the implant's surface model. The screw holes are added to the model after the trace lines are processed. Next, the model is converted into an STL file, which is made available for forming implant material into the PSI.