40 results about "Volumetric printing" patented technology

The present invention relates to a process, an apparatus and photoswitchable photoinitiators for locally polymerizing a starting material by dual color photopolymerization and a method for volumetric printing of a shaped body (xolography). In particular, photoinitiators are provided, which cause raring of photopolymerizable formulations upon irradiation with two different wavelengths and which maybe used for volumetric printing (xolocure initiators).

The present invention includes methods for reducing photoexcitation of a photoswitchable photoinitiator in volumetric printing including a volume of a photohardenable composition at locations in the volume at which intersection of two wavelengths does not occur; methods of three-dimensional (3D) printing including dual-wavelength photoexcitation of a photohardenable composition included in a volume, the method including photoexcitation by a modified or controllably-sized light sheet including a first wavelength and an optical projection including a second wavelength; and methods for extending the reuse-printing lifetime of a photohardenable composition including a photoswitchable photoinitiator. Preferably the photohardenable composition includes the dual-wavelength photoinitiator and a photohardenable resin component. The present invention also includes a photohardenable composition including a photoswitchable photoinitiator with an improved reuse-printing lifetime.

Volumetric Additive Manufacturing allows for the rapid printing of objects by transmitting images into a reservoir holding resin, using wavelengths of light associated with a photocuring characteristic of the resin. Feedback based control can be enabled through the use of optical scattering tomography based imaging of the object during the printing process. Through capturing a set of images representing the scattering of a non-curing light, an isosurface representing the object during printing can be generated. The differences between the isosurface and the expected shape of the object can be used as an input into a control process or they can be displayed to an operator so that printing can be terminated when the printing of the object is complete.

An example of a fusing agent includes cesium tungsten oxide nanoparticles present in an amount ranging from about 0.01 wt% active to about 1 wt% active, based on a total weight of the fusing agent, and a liquid vehicle. The liquid vehicle includes water and a co-solvent mixture including from about 0.1 wt% active to about 10 wt% active of benzyl alcohol and from about 10 wt% active to about 40 wt% active of a co-solvent to improve miscibility between the benzyl alcohol and the water, where the wt% active of the benzyl alcohol of the co-solvent are each based on the total weight of the liquid vehicle.

A liquid photohardenable composition for volumetric printing including a photohardenable resin component, a dual-wavelength photoinitiator, and a thixotrope,, wherein the liquid photohardenable composition exhibits non-Newtonian rheological behavior and a light transmittance greater than 90% for a 5 centimeter (cm) pathlength. Preferably such transmissivity remains above 90% for at least 10 days after preparation. Preferably the liquid photohardenable composition exhibiting non-Newton rheological behavior has a yield stress greater than or equal to about 5 Pascals at 50 degrees Celsius, Methods of forming an object in a volume of a liquid photohardenable composition of the invention and a method for screening thixotropes for inclusion in a liquid photohardenable composition are also disclosed.

Stereographic printing 3 on a porous substrate 4 penetrates 7 through it and onto an underlying bonding substrate 6. Preferably the substrates 4, 6 are flexible, the bonding substrate 6 is more wettable than the porous substrate 4, and the porous substrate 4 has higher degree of capillarity than the bonding substrate 6. The substrates 6, 4 are preferably placed on a last 2 and the three-dimensional printed features 8 are overprinted with another 3D print layer. The wearable article produced is a glove.

The present invention relates to spiropyrans and process for the manufacture of them. In particular, a method is provided to exchange the indole and salicylaldehyde part of a spiropyran in a reversible reaction. The method is used for the synthesis of dual color photoinitiators with specific substituents and substitution patterns, which result in improved dual color volumetric printing (xolography). Furthermore, a process for locally polymerizing a starting material by dual color photopolymerization is disclosed.

Stereographic printing 3 on a porous substrate 4 penetrates 7 through it and onto an underlying bonding substrate 6. Preferably the substrates 4, 6 are flexible, the bonding substrate 6 is more wettable than the porous substrate 4, and the porous substrate 4 has higher degree of capillarity than the bonding substrate 6. The substrates 6, 4 are preferably placed on a last 2 and the three-dimensional printed features 8 are overprinted with another 3D print layer. The wearable article produced is a glove.

The three-dimensional printing method comprises the steps that a printing area is arranged on a textile, modeling is conducted according to a pre-designed three-dimensional pattern, slicing and layering are conducted on modeling, different gray scale proportions are set for the lines in the layering effect design, then layering structure information is input into a 3D printing machine, and the three-dimensional printing area is obtained. After the 3D printing machine reads, printing is carried out on the printing area, the white ink proportion of the lines extruded by the printing machine is affected by different gray scale proportions of the lines in the printing process, the viscosity and concentration of a printing material can be affected by the white ink proportion, and then the lines printed on the printing area are different in height, so that the fabric achieves different textures and stereoscopic impression; and unique design and visual effect are shown.

The present invention relates to a process for volumetric printing of a shaped body comprising locally polymerizing a starting material comprising a bio-co-initiator.

A method for volumetric printing a three-dimensional object by multi-color photopolymerization of a photocurable resin.

The utility model relates to the technical field of three-dimensional printing, in particular to a polarized light three-dimensional anti-counterfeit printing device which comprises a first supporting frame, a conveying assembly, a second supporting frame, an ink storage box, a sealing cover, an ink conveying pipe, a water pump, a first air cylinder and a printing plate. The second supporting frame is fixedly connected with an ink storage box, the ink storage box is covered with a sealing cover, two first air cylinders are installed in the second supporting frame, a printing plate is installed between telescopic rods of the two first air cylinders, and an ink conveying pipe is connected between the printing plate and the ink storage box. A motor is started, a printed matter is placed on a conveying assembly, an output shaft of the motor rotates to drive a clamping rod, a shaft rod and a dust-sticking roller to rotate, the conveying assembly drives the printed matter to move backwards, dust and impurities on the surface of the printed matter are removed while the dust-sticking roller rotates, and particles are prevented from being pressed into printing ink or materials in the printing process; therefore, printing defects are reduced.

The invention discloses an intermittent three-dimensional printing method and a textile thereof. The method comprises the following steps: step (1), ink-jet printing is carried out in a to-be-printed area of base cloth by using a three-dimensional printing composition, and curing is carried out, so that a first three-dimensional printing layer is formed; (2) ink-jet printing is carried out in the to-be-printed area of the base cloth through a three-dimensional printing composition, the three-dimensional printing composition is overlaid on the first three-dimensional printing layer and cured, and a second three-dimensional printing layer is formed; (3) repeating the step (2) for n times on the second three-dimensional printing layer to form an (n + 2) th three-dimensional printing layer, and further forming a three-dimensional printing structure, wherein n is greater than or equal to 1 and is an integer. The three-dimensional printing structure is prominent in three-dimensional height, stable in three-dimensional structure, rich in shape and color and fine and smooth in texture.

A process, an apparatus, and photoswitchable photoinitators for polymerizing a starting material by dual color photopolymerization. In particular, photoinitiators are provided, which cause curing of photopolymerizable formulations upon illumination with two different wavelengths.

A liquid photohardenable composition for volumetric printing including a photohardenable resin component, a dual-wavelength photoinitiator, and a thixotrope,, wherein the liquid photohardenable composition exhibits non-Newtonian rheological behavior and a light transmittance greater than 90% for a 5 centimeter (cm) pathlength. Preferably such transmissivity remains above 90% for at least 10 days after preparation. Preferably the liquid photohardenable composition exhibiting non-Newton rheological behavior has a yield stress greater than or equal to about 5 Pascals at 50 degrees Celsius, Methods of forming an object in a volume of a liquid photohardenable composition of the invention and a method for screening thixotropes for inclusion in a liquid photohardenable composition are also disclosed.

A sono-ink composition is described that includes a acrylate oligomer, an acoustic absorber, and a thermal initiator. A method of using the sono-ink for deep-penetrating volumetric printing is also described. The method includes the steps of a) providing a volume of a sono-ink composition, comprising a acrylate oligomer, an acoustic absorber, and a thermal initiator; b) directing a focused acoustic projection of ultrasound waves into the volume of the sono-ink, wherein the focused acoustic projection of ultrasound waves has an intensity and frequency sufficient to activate the thermal initiator so that local polymerization is achieved at a desired region within the volume of sono-ink; and c) optionally repeating step b wherein the focused acoustic projection of ultrasound waves is directed to selected regions within the sono-ink, until a three-dimensional object is formed.

The utility model relates to the technical field of heat transfer printing, and discloses a three-dimensional printing heat transfer printing machine which comprises a workbench, a support is fixedly connected to the upper surface of the workbench, a hydraulic rod is fixedly connected to the interior of the support, and a mounting assembly is arranged at the output end of the hydraulic rod. A guide plate is fixedly connected to the upper surface of the workbench, a first connecting frame is fixedly connected to one side of the outer wall of the guide plate, a transmission assembly is arranged at one end of the first connecting frame, the mounting assembly comprises a connecting seat, one end of the connecting seat is fixedly connected to the output end of a hydraulic rod, and a first spring is arranged in the connecting seat. A connecting block is slidably connected to the inner wall of the connecting base, and a second spring is arranged in the connecting block. According to the heat transfer printing head, the connecting block is inserted into the connecting base, so that the steel ball is shrunk, when the steel ball moves to the sliding groove, the steel ball is clamped into the sliding groove, the connecting block and the connecting base are rapidly connected in the mode, and then the heat transfer printing head is rapidly installed.

The utility model discloses a three-dimensional printing structure with a 3D perspective effect, which comprises a substrate, a pattern printing layer arranged in front of the substrate, a transparent medium layer arranged between the substrate and the pattern printing layer, a perspective window arranged on the pattern printing layer, and a shading layer arranged around the perspective window on the transparent medium layer. The front side of the base plate is provided with a lower layer pattern corresponding to the perspective window, and the lower layer pattern comprises a first focusing pattern and a second focusing pattern arranged in the first focusing pattern. The three-dimensional printing structure is simple in integral structure, convenient to assemble, low in production cost and easy to popularize, patterns can change along with the transfer of sight lines, the three-dimensional sense is strong, the interestingness of a person is achieved, the aesthetic feeling of plane printing patterns is improved, a new three-dimensional visual effect is generated, and the three-dimensional printing structure has memorial property and collection value, and meanwhile, the three-dimensional printing structure is simple in integral structure, convenient to assemble, low in production cost and suitable for popularization and application. And popularization and use are facilitated.

The invention relates to the technical field of textiles, in particular to a printing method for simultaneous printing and three-dimensional printing and a textile thereof. The printing method for simultaneous printing and three-dimensional printing comprises the steps that 1, the layering effect of design software is designed; 2, the ink jet machine table system reads and controls an ink jet assembly to print according to a layered structure track; step 3, spraying a coating by a digital nozzle; step 4, superposing a plurality of layers of coatings; and 5, drying and reinforcing. According to the method, the 2D plane printing effect and the 3D printing effect are presented on the textile at the same time, precision is high in the production process, controllability is high, and the method is suitable for various textiles. And after the product is quickly output, simple drying and reinforcing treatment is performed to form a textile finished product. And compared with traditional machining procedures, the machining cost is low, and the machining efficiency is high. According to the prepared textile, the color printing layer, the printing layer and the three-dimensional layer are simultaneously arranged on the structure, the structure style is novel, and the style structure change is more diversified.

The present invention relates to volumetric additive manufacturing (3D printing) through holograms for manufacturing high performance components with high mechanical properties at low cost and with low environmental impact from a wide variety of different materials, including but not limited to metallic materials, ceramic materials, polymeric materials and / or combinations thereof. The invention further relates to the apparatus used, and to the printed components.

The invention relates to spiropyrans and a method of making the same. In particular, the present invention provides a method of exchanging the indole and salicylaldehyde moieties of spiropyrans in a reversible reaction. The method is used for synthesizing two-color photoinitiators with specific substituents and substitution patterns, which improves two-color volume printing (two-color volume printing). In addition, the invention also discloses a method for locally polymerizing a starting material through two-color photopolymerization.

The invention relates to a full-automatic three-dimensional printing and intelligent quality monitoring method for a set top box, which comprises the following steps of: pre-storing each series of three-dimensional data of the set top box in a storage module, designing a printing scheme, collecting the three-dimensional data of the set top box to be printed in real time, performing feature extraction, performing feature comparison, arranging the three-dimensional data in a three-dimensional printing unit, and printing. The printed set-top box is transmitted to a monitoring unit box for quality monitoring, if the printing quality meets the preset requirement, the set-top box is transmitted to a full-automatic packaging unit for packaging, otherwise, the set-top box is transmitted to an automatic erasing unit for automatic erasing processing, and after the erasing quality meets the requirement, analysis is performed according to the printing quality monitoring result of the set-top box; according to the method, the set top box is automatically erased, the implemented three-dimensional printing scheme is adjusted according to the printing quality monitoring result, and the set top box subjected to automatic erasing processing is printed again based on the adjusted three-dimensional printing scheme, so that the production cost is effectively reduced, the labor is reduced, and the production efficiency and the product quality stability are improved.

The disclosure provides systems for 3D printing. A 3D printer system includes one or more sources of actinic radiation characterized at least by a powered state and an unpowered state. A resin enclosure is transmissive to the actinic radiation. A temperature control system thermally communicates with the resin enclosure and maintains the resin enclosure at a predetermined sub-ambient chilled state. A control circuit is in electrical communication with the sources of actinic radiation and the temperature control system. The control circuit includes first non-transitory logic to switch the sources of actinic radiation to the powered state when one or more threshold criteria is satisfied including a requirement the temperature control system is in a predetermined state causing the resin enclosure to be below a temperature. A second non-transitory logic switches the sources of actinic radiation to the unpowered state when one or more threshold criteria is not satisfied.

The present invention includes methods for forming an object in a volume of a photohardenable composition included in a container including directing a light sheet and an optical image through a selected region of a surface of the container to a first position in the volume to initiate hardening of the composition as a result of exposure to the light sheet and optical image, wherein at least one of the light sheet or the optical image pass through an optical alignment element before passing into the container. Systems and printhead modules are also disclosed.

A device for volumetric 3D printing to form a three-dimensional object, the device comprising: - a working volume designed to accommodate a photopolymerizable material, in particular a photopolymerizable polymer resin, which is to be irradiated with light to form a three-dimensional object; - at least one first irradiation device configured to emit light of a first wavelength into the working volume in order to produce at least one first light projection in the working volume, wherein the at least one first light projection comprises several light rays traversing the working volume in at least one light plane; - at least one light modulation device associated with the at least one first irradiation device, wherein the at least one light modulation device is configured to modulate the spatial direction of extension of two or more light beams of the multiple beams in the at least one plane of light such that the two or more light beams extend in a non-parallel arrangement relative to each other.

The utility model discloses an intermittent three-dimensional printing textile which comprises base cloth and a three-dimensional printing structure located on the base cloth, and the three-dimensional printing structure is a multi-layer three-dimensional printing layer formed by digital ink jet interval printing and stacking. The three-dimensional printing structure with the multiple three-dimensional printing layers is formed through multiple times of digital ink jet and interval printing and stacking, so that the three-dimensional height of the three-dimensional printing structure is more prominent, structures between the three-dimensional printing layers are more tightly attached, the shape and color of the three-dimensional printing structure are richer, and the three-dimensional printing structure is more attractive in appearance. And the texture on the three-dimensional printing structure is finer and smoother.

A method for volumetric printing a dental component by photopolymerization of a photocurable resin.

The present invention relates to a construction platform (100) for constructing a workpiece (200) layer by layer in a three-dimensional printing method, the construction platform comprising: a back-side exposure device (101-1), the back-side exposure device being used to expose a layer (103-n) from the back side; a light sensor (105), the light sensor being used to detect the light intensity of the front-side exposure device (101-2) passing through the layer (103-n) and / or the material and / or passing through a deflection mirror; and a control device (107), the control device being used to activate the back-side exposure device (101-1) when the detected light intensity of the front-side exposure device (101-2) is above a predetermined extreme value.

In order to make the film thickness of a coating film (15) uniform, a stereolithographic article (1) has: a body having a plurality of step-like recesses (12) formed in the shaping lamination direction by stereolithography; groove parts (13) or wall parts (14) discretely formed in the step-like recesses (12); and the coating film (15), which is applied to the surface of the body including the step-like recesses (12).