Microfluidic bubble-generator enables digital light processing 3D printing of porous structures

Three-dimensional(3D)printing is an emerging technique that has shown promising success in engineering human tissues in recent years.Further development of vatphotopolymerization printing modalities has significantly enhanced the complexity level for 3D printing of various functional structures and components.Similarly,the development of microfluidic chip systems is an emerging research sector with promising medical applications.This work demonstrates the coupling of a digital light processing(DLP)printing procedure with a microfluidic chip system to produce size-tunable,3D-printable porosities with narrow pore size distributions within a gelatin methacryloyl(GelMA)hydrogel matrix.It is found that the generation of size-tunable gas bubbles trapped within an aqueous GelMA hydrogel-precursor can be controlled with high precision.Furthermore,the porosities are printed in two-dimensional(2D)as well as in 3D using the DLP printer.In addition,the cytocompatibility of the printed porous scaffolds is investigated using fibroblasts,where high cell viabilities as well as cell proliferation,spreading,and migration are confirmed.It is anticipated that the strategy is widely applicable in a range of application areas such as tissue engineering and regenerative medicine,among others.

Soft pneumatic actuators by digital light processing combined with injection-assisted post-curing

The soft robotics display huge advantages over their rigid counterparts when interacting with living organisms and fragile objects.As one of the most efficient actuators toward soft robotics,the soft pneumatic actuator(SPA)can produce large,complex responses with utilizing pressure as the only input source.In this work,a new approach that combines digital light processing(DLP)and injection-assisted post-curing is proposed to create SPAs that can realize different functionalities.To enable this,we develop a new class of photo-cross linked elastomers with tunable mechanical properties,good stretchability,and rapid curing speed.By carefully designing the geometry of the cavities embedded in the actuators,the resulting actuators can realize contracting,expanding,flapping,and twisting motions.In addition,we successfully fabricate a soft self-sensing bending actuator by injecting conductive liquids into the three-dimensional(3D)printed actuator,demonstrating that the present method has the potential to be used to manufacture intelligent soft robotic systems.

Color control of the multi-color printing device

Conventional color-printing systems often use inks of three hues, such as CMY, CMYK and CMYKLcLm, but in order to obtain more realistic color reproductions, the ink set of more than three hues has been adopted by some color-printing systems. It is difficult, however, to model the composed color with the multiple inks when the number of the output ink hues exceeds three due to the none-unique mapping between the color spaces of the CIE Lab and the multi-color printing device. In this paper, we propose a fine color-printing method for multi-color printing device with the ink set of more than three hues. The proposed approach has good color expression ability and provides fine control of the printed color. By dividing the output color space into several subspaces, our method allows one-to-one mapping between the standard color space and the multi-color output color space. It has been proved effective when applied to the digital inkjet printer—Mutoh8000.

High performance hydroxyapatite ceramics and a triply periodic minimum surface structure fabricated by digital light processing 3D printing

High performance hydroxyapatite(HA)ceramics with excellent densification and mechanical properties were successfully fabricated by digital light processing(DLP)three-dimensional(3D)printing technology.It was found that the sintering atmosphere of wet C02 can dramatically improve the densification process and thus lead to better mechanical properties.HA ceramics with a relative density of 97.12%and a three-point bending strength of 92.4 MPa can be achieved at a sintering temperature of 1300℃,which makes a solid foundation for application in bone engineering.Furthermore,a relatively high compressive strength of 4.09 MPa can be also achieved for a DLP-printed p-cell triply periodic minimum surface(TPMS)structure with a porosity of 74%,which meets the requirement of cancellous bone substitutes.A further cell proliferation test demonstrated that the sintering atmosphere of wet CO2 led to improve cell vitality after 7 days of cell culture Moreover,with the possible benefit from the bio-inspired structure,the 3D-printed TPMS structure significantly improved the cell vitality,which is crucial for early osteogenesis and osteointegration.

贵州民族蜡染服饰纹样数字化图库构建及应用研究

民族蜡染服饰丰富的纹样是民族传统服饰文化的瑰宝。贵州民族蜡染服饰古朴典雅,具有浓厚的文化底蕴。文章在梳理民族蜡染服饰纹样和图数据库的基础上,利用文献研究法和系统法对贵州苗族蜡染服饰纹样、瑶族蜡染服饰纹样、布依族蜡染服饰纹样、水族蜡染服饰纹样、畲族蜡染服饰纹样的艺术价值进行了研究。通过将民族蜡染服饰纹样数字化,并构建民族蜡染服饰纹样图库,给出了具体的艺术价值和应用,为民族蜡染服饰文化的传承和发展提供了一种有效的新思路。

棉织物新型涂料数码喷墨印花应用性能研究

针对传统涂料数码喷墨印花工艺中喷涂织物处理液和高温固色的环节,通过使用新型涂料数码喷墨印花工艺可省去上述环节,以达到缩短工艺流程、节能环保、减少废气排放、降本增效的目的。通过对新型涂料数码喷墨印花技术和传统涂料数码喷墨印花技术进行对比研究,将使用两种喷墨印花工艺的棉织物分别进行颜色特征值、色牢度、pH值、硬挺度、折皱回复角的测试。结果表明,新型涂料数码喷墨印花工艺在绿色节能、降低成本的同时,其耐摩擦色牢度、硬挺度和折皱回复角方面的表现优于传统涂料数码印花工艺;在颜色特征值、pH值和耐皂洗色牢度方面与传统涂料数码印花工艺性能相当。总体来说,新型涂料数码喷墨印花工艺符合绿色印染的发展方向,降低了企业生产成本,对企业实际的生产有一定的参考意义,具有广阔的应用前景和发展潜力。

面向纺织印染的新一代数字制造系统

针对纺织印染业数据感知、信息融合、知识推理、业务交互、人机协同等网络化、智能化产业升级需求,提出纺织印染新一代数字制造系统框架,结合业务生产全流程建立数据中台实现跨系统融合的综合智能决策;面向全生产决策领域构建决策支持组件池,推进业务系统与控制系统的融合;基于全业务生产流程数据的感知融合,搭建经营驾驶舱、订单数字化管控系统、设备数字化管控系统、能源数字化管控系统与环保安防数字化管控系统等,形成决策-执行闭环反馈的模式,实现业务和生产全流程信息管控。广东某纺织染整有限公司基于该纺织印染新一代数字制造系统框架对染色车间进行数字制造技术升级,与2019年度相比,该企业2021年度智能染色和定形示范车间人均产值提升145.0%和129.9%,良品率提升9.1%和2.6%,能源利用率提升31.9%和34.9%,在生产效率、产品质量、能源利用方面获得显著提升。

Demonstration of a Polymer-Based Single Step Waveguide by 3D Printing Digital Light Processing Technology for Isopropanol Alcohol-Concentration Sensor

A polymer based horizontal single step waveguide fbr the sensing of alcohol is developed and analyzed.The waveguide is fabricated by 3-dimensional(3D)printing digital light processing(DLP)technology using monocure 3D rapid ultraviolet(UV)clear resin with a refractive index of n=1.50.The fabricated waveguide is a one-piece tower shaped ridge structure.It is designed to achieve the maximum light confinement at the core by reducing the effective refractive index around the cladding region.With the surface roughness generated from the 3D printing DLP technology,various waveguides with different gap sizes are printed.Comparison is done fbr the different gap waveguides to achieve the minimum feature gap size utilizing the light re-coupling principle and polymer swelling effect.This effect occurs due to the polymer-alcohol interaction that results in the diffusion of alcohol molecules inside the core of the waveguide,thus changing the waveguide from the leaky type(without alcohol)to the guided type(with alcohol).Using this principle,the analysis of alcohol concentration performing as a larger increase in the transmitted light in tensity can be measured.In this work,the sensitivity of the system is also compared and analyzed fbr different waveguide gap sizes with different concentrations of isopropanol alcohol(IPA).A waveguide gap size of 300 jim gives the highest in crease in the transmitted optical power of 65%when tested with 10μL(500ppm)concentration of IPA.Compared with all other gaps,it also displays faster response time(/=5seconds)fbr the optical power to change right after depositing IPA in the chamber.The measured limit of detection(LOD)achieved fbr 300μm is 0.366 yL.In addition,the fabricated waveguide gap of 300μm successfully demonstrates the sen sing limit of IPA concentration below 400μpm which is considered as an exposure limit by"National Institute for Occupational Safety and Health".All the mechanical mount and the alignments are done by 3D printing fused deposition method(FDM).

基于DLP 3D打印的高给药效率微针制备工艺

载药微针可以实现一次性快速药物递送,无需二次药物涂敷与输送过程,但其不佳的载药量与刺入率造成了给药效率差的问题。研发了一种基于数字光处理(DLP)3D打印技术的高给药效率微针(HDMN)制备工艺。通过在载药微针上构建锯齿状针体结构与阶梯状载药结构来提高载药微针的刺入率与载药量,进而提高给药效率。实验结果表明使用环氧丙烯酸酯(EA)打印微针时,当曝光时间为700 ms、打印层厚为30μm时,打印出的微针实际尺寸与理论尺寸平均误差最小为9.2%。利用旋涂法在微针表面交联聚乙二醇二丙烯酸酯(PEGDA)以改善微针生物相容性。显微镜观察发现,当交联层数为1层时,PEGDA均匀地覆盖在微针表面。石蜡膜穿刺实验结果表明,HDMN穿透了2层石蜡膜,而相同实验条件下的传统载药微针仅穿透了1层。药物释放实验结果表明,HDMN相对于传统载药微针在猪皮内留下的模拟药物浓度提升了61%。该研究为后续通过改善微针结构来优化微针性能研究提供了有益借鉴。

基于机器视觉的数码印花工厂自动报工系统

针对纺织行业中现有人工布匹生产订单报工管理困难的问题,设计并实现了一个基于机器视觉的数码印花工厂自动报工系统,将正在生产的布匹图像与订单库中的花型图案进行智能匹配,从而对生产订单进行快速准确的报工管理;首先系统客户端使用工业相机实时采集生产线上的印花布匹图像,并对图像进行滤波、归一化等预处理;然后将图像通过HTTP协议发送至系统服务端,利用基于Vision Transformer的神经网络模型进行特征提取和多层特征融合,再与订单库中的花型图案进行匹配,找出待报工订单;最后对匹配结果进行数据库管理,并将匹配结果返回客户端用于报工结果展示与确认操作;实验结果表明,该自动报工系统的订单匹配TOP-3命中率达到90.4%,满足工厂布匹生产需求。

火工品装药增材制造技术研究现状与发展趋势

增材制造技术是基于数字化加工的新一代先进快速成型技术,因其在火工品装药中能够有效发挥高精度、高安全和自动化连续生产的优势而受到广泛关注。本文介绍了喷墨打印技术、墨水直写技术和基于光固化的墨水打印技术的工作原理和特点,综述了这3种增材制造技术在火工品装药领域的研究现状,分析了相关技术的发展趋势,以期为火工品装药以及武器装备的数智化发展提供参考。

基于图像处理的数码印花棉织物色差检测

织物色差等级评定目前主要依赖于人工对比标准样卡进行判定,其等级判断易受人为主观因素影响。为对棉织物色差进行客观、全局化评定,文中提出3种基于OpenCV的织物色差评定方法:首先在D_(65)光源下获取标准样卡的不同色差等级灰度图像,使用高斯滤波对图像进行降噪,然后分别采用MSE均方误差、PSNR峰值信噪比、SSIM结构相似性指数算法对标准样卡灰度图像进行量化处理,建立并寻找最佳模型。为验证模型的准确性,采用数码印花对经过不同前处理工艺的棉织物喷印染色作为测试样本,通过模型得到色差等级,并与人工评定色差结果对比。结果表明:3种图像处理评定织物色差模型的评定结果均与人工评定具有高度一致性,图像处理方法更加简洁、客观和高效。

基于光引发可逆加成断裂链转移自由基聚合的3D打印

针对高分子化学本科教学中“活性自由基聚合”知识点抽象,学生难以理解的教学难题,开展了光引发可逆加成断裂链转移(RAFT)自由基聚合3D打印实验。实验首先合成O-(乙基)-S-(2-丙酸乙酯基)黄原酸酯(EXEP),随后使用商用光敏树脂,进行添加/不添加EXEP条件下的3D打印。随后使用得到的打印体开展荧光功能后修饰与焊接对比实验。通过对比实验现象,深入理解活性自由基聚合机理及其对产物后功能化能力的影响,实现“活性自由基聚合”原理的“可视化”和实例化应用展示。本实验将基础理论有机融合到趣味实验中,实验耗时合理,操作简便,效果明显,符合本科教学实验基本要求,有助于提升学生综合分析能力,激发学生深入研究的兴趣,培养其创新意识及拓展延伸的能力。

Creating a bionic scaffold via light-curing liquid crystal ink to reveal the role of osteoid-like microenvironment in osteogenesis

Osteoid plays a crucial role in directing cell behavior and osteogenesis through its unique characteristics,including viscoelasticity and liquid crystal(LC)state.Thus,integrating osteoid-like features into 3D printing scaffolds proves to be a promising approach for personalized bone repair.Despite extensive research on viscoelasticity,the role of LC state in bone repair has been largely overlooked due to the scarcity of suitable LC materials.Moreover,the intricate interplay between LC state and viscoelasticity in osteogenesis remains poorly understood.Here,we developed innovative hydrogel scaffolds with osteoid-like LC state and viscoelasticity using digital light processing with a custom LC ink.By utilizing these LC scaffolds as 3D research models,we discovered that LC state mediates high protein clustering to expose accessible RGD motifs to trigger cell-protein interactions and osteogenic differentiation,while viscoelasticity operates via mechanotransduction pathways.Additionally,our investigation revealed a synergistic effect between LC state and viscoelasticity,amplifying cellprotein interactions and osteogenic mechanotransduction processes.Furthermore,the interesting mechanochromic response observed in the LC hydrogel scaffolds suggests their potential application in mechanosensing.Our findings shed light on the mechanisms and synergistic effects of LC state and viscoelasticity in osteoid on osteogenesis,offering valuable insights for the biomimetic design of bone repair scaffolds.

花型智能设计真丝棉针织物数码印花工艺研究

采用12%桑蚕丝、42%竹纤维、46%长绒棉,并线成9.0tex(65^(S))双股纱,用单面大圆机织造成真丝棉针织单面布,经烧毛、丝光、退煮漂、智能设计花型、数码印花、蒸化、水洗、柔软定形、蒸呢、预缩等工序加工制成。探讨了AI智能图案设计,AI智能在线配色把控流行色彩,一键试衣立体仿真展示;喷头工作的区域加装密封舱,解决喷印时飞墨产生的污染;烘干装置和喷印系统分隔成两个空间,既避免喷嘴堵塞,又减少空调耗电量,实现绿色智能化生产。并指出了所得产品质感光滑、贴身凉爽、花型前卫时尚,是一款优良的高档绿色数码印花面料。

工业用数码喷墨印刷的发展现状和未来展望

印刷术被誉为“文明之母”,为人类文明的普及作出了巨大贡献。我国作为世界文明古国,在隋唐时期便已发明雕版印刷术,而宋朝时期的活字印刷术作为中国古代四大发明之一,有力推动了世界文明的发展进程。文章首先介绍了印刷产业及数码喷墨印刷产业发展概况,同时介绍了工业用数码喷墨印刷设备及其核心组件和耗材的市场及技术发展现状,并展望数码印刷未来发展趋势。

数字化技术在网印图案设计中的应用探索

对数字化技术在网印图案设计中的应用展开了综合性的探究,应用过程涉及设计前期的准备、设计期间的完善和补充,通过具体的案例展示出数字化技术应用的现实成效。文章进一步分析揭示出数字化技术应用遇到的一些实际挑战,如技术更新速度与设备投资成本、数据安全与知识产权保护、技术人才短缺等,提出相应的对策。使这些问题得到解决,使数字化技术在网印图案设计中的应用能够得到持续开展。

数码印花图案在动漫服装设计中的运用

随着科技的发展和消费者审美需求的变化,数码印花技术以其高效、灵活和个性化的特点,逐渐在动漫服装领域占据了一席之地。本文详细探讨了数码印花图案在动漫服装设计中的运用,包括其设计原则、应用方式、市场影响和未来趋势等方面。通过对数码印花技术的深入分析和实例展示,旨在为动漫服装设计师提供新的设计思路和方法,同时也为相关领域的研究者提供有价值的参考。

基于数字孪生概念的PCB镀铜工艺性能评估

本论文以PCB(Printed Circuit Board)镀铜工艺为例,探讨了基于数字孪生概念的PCB镀铜工艺性能评估方法及其应用。通过数学建模、数值仿真和数据采集等手段,实现了镀铜过程的数字化表示,并基于此搭建了数字孪生模型。我们将此技术整合到传统的PCB镀铜工艺中,在PCB设计初期就通过数字孪生模型的输出结果,评估不同工艺参数对镀铜工艺性能的影响,从而提高一次设计成功率,减少样件修改,重制的次数,降低开发成本,提高产品质量。

Tough PEG-only hydrogels with complex 3D structure enabled by digital light processing of“all-PEG”resins

Digital light processing(DLP)of structurally complex poly(ethylene glycol)(PEG)hydrogels with high mechanical toughness represents a long-standing challenge in thefield of 3D printing.Here,we report a 3D printing approach for the high-resolution manufacturing of structurally complex and mechanically strong PEG hydrogels via heat-assisted DLP.Instead of using aqueous solutions of photo-crosslinkable monomers,PEG macromonomer melts werefirst printed in the absence of water,resulting in bulk PEG networks.Then,post-printing swelling of the printed networks was achieved in water,producing high-fidelity 3D hydrogels with complex structures.By employing a dual-macromonomer resin containing a PEG-based four-arm macrophotoinitiator,“all-PEG”hydrogel constructs were pro-duced with compressive toughness up to 1.3 MJ m^(-3).By this approach,porous 3D hydrogel scaffolds with trabecular-like architecture were fabricated,and the scaf-fold surface supported cell attachment and the formation of a monolayer mimicking bone-lining cells.This study highlights the promises of heat-assisted DLP of PEG photopolymers for hydrogel fabrication,which may accelerate the development of 3D tissue-like constructs for regenerative medicine.