A novel method for improving surface finish of stereolithography apparatus
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Stereolithography
The process of converting polyethylene plastic waste to polyethylene wax is studied in this paper. The effect of the reaction conditions—including pyrolysis temperature, pyrolysis time, and the content of the additive—on the yield and quality of the PE wax—such as penetration degree and melting point—are discussed. The PE wax obtained has a melting point of 104–144°C. The penetration degree is 0.1–42.4 mm; the yield of PE wax is over 90%.
Penetration (warfare)
Plastic Waste
Paraffin wax
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Being the earliest form of additive manufacturing, stereolithography (SLA) fabricates 3D objects by selectively solidifying the liquid resin through a photopolymerization reaction. The ability to fabricate objects with high accuracy as well as a wide variety of materials brings much attention to stereolithography. Since its invention in the 1980s, SLA underwent four generations of major technological innovation over the past 40 years. These innovations have thus resulted in a diversified range of stereolithography systems with dramatically improved resolution, throughput, and materials selection for creating complex 3D objects and devices. In this paper, we review the four generations of stereolithography processes, which are scanning, projection, continuous and volumetric stereolithography. For each generation, representative stereolithography system configurations are also discussed in detail. In addition, other derivative technologies, such as scanning–projection, multi-material, and magnetically assisted stereolithography processes, are also included in this review.
Stereolithography
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The process of converting polyethylene plastic waste to polyethylene wax is studied in this paper. The effect of the reaction conditions—including pyrolysis temperature, pyrolysis time, and the content of the additive—on the yield and quality of the PE wax—such as penetration degree and melting point—are discussed. The PE wax obtained has a melting point of 104–144°C. The penetration degree is 0.1–42.4 mm; the yield of PE wax is over 90%.
Penetration (warfare)
Plastic Waste
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Stereolithography
Three dimensional printing
Rapid Prototyping
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Stereolithography (SLA), the first form of additive manufacturing, creates 3D objects by selectively solidifying liquid resin via a photopolymerization reaction. Stereolithography has gained popularity due to its ability to fabricate objects with high accuracy and in a wide range of materials. SLA has undergone four generations of major technological innovation since its invention in the 1980s. As a result of these advancements, a diverse range of stereolithography systems with dramatically improved resolution, throughput, and material selection for creating complex 3D objects and devices is now available.
Stereolithography
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Waste polyolefins can be converted into value-added products like oils and chemical waxes by a process called pyrolysis. In the present study, conversion of waste polyethylene to polyethylene (PE) wax was carried out via pyrolysis using a ZSM 5 (zeolite based) and Luperox as catalysts. The effect of pyrolysis residence time, catalyst type, loading on the yield, and properties of the PE wax were investigated. Further, a comparison of the properties of PE wax obtained via pyrolysis and the market sample of PE wax was made to optimize the reaction conditions of pyrolysis. It was observed that with an increase in the catalyst loading and residence time, not just the yield of PE wax reduced but it also led to the degradation in the properties of PE wax. The waxes produced via pyrolysis at residence time of 90 min for waste low-density polyethylene and 150 min for waste high-density polyethylene exhibited properties comparable to that of the market sample of PE wax. The PE wax thus obtained has application in textile coatings, plastic processing, and printing inks.
Paraffin wax
Low-density polyethylene
High-density polyethylene
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The stereolithography is one of the most mature and widely used rapid prototyping technologies.One of the advantages,which make the stereolithography become more and more popular,is the high accuracy.Some factors which influence the accuracy of the stereolithography parts were discussed,including date exchanging of CAD geometry,material properties,recoating thickness,optics system,laser scanning methods in the process and so on.Some methods to improve the accuracy of stereolithography parts were proposed based on the state of the art of the accuracy in stereolithography in the world.
Stereolithography
Rapid Prototyping
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ABSTRACT A method of preparation of oxidized polyethylene waxes, which have many applications such as in plastics, rubber, leather, paper, inks and textile, etc. was developed. The experiments of polyethylene waxes oxidization were carried out in a pilot plant. The reactor was a 0.27 m diameter and 3 m high column reactor with a conical distribution plate. The experimental results showed that the optimal conditions for preparation of the Oxidized Polyethylene Waxes were: catalyst KMnO4, reaction temperature 141—148°C, reaction time 3-7 h, air velocity 4—8 m/s. The oxidized polyethylene waxes with acid number of above 30 mgKOH/g could be obtained with this method.
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The stereolithography(SL) process is a type of fabrication technology which relies on photopolymerization. It has a relatively simple fabrication process and a resolution of several tens of ${\mu}m$ . Recently, SL technology has been applied to various areas, such as bioengineering and MEMS devices, due to the development of advanced materials. This technologycan be divided intothe scanning(SSL) and projection (PSL) types. In this paper, in stereolithography, parts are fabricated by curing photopolymeric resins with light. The application of stereolithography can now include fabricated parts. This process, called stereolithography, can fabricate parts by taking into account theirdegrees of geometry complexity. In particular, UV-LED stereolithography can perform quite rapid fabrication in which specific cross-sections are cured upon exposure to light.
Stereolithography
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