Plastics processing

AccessScience ◽  
2015 ◽  
Keyword(s):  
Plastics Processing

scholarly journals Induced network-based transfer learning in injection molding for process modelling and optimization with artificial neural networks

2021 ◽  
Vol 112 (11-12) ◽  
pp. 3501-3513
Author(s):  
Yannik Lockner ◽  
Christian Hopmann
Keyword(s):  
Injection Molding ◽  
Transfer Learning ◽  
Injection Molding Process ◽  
Process Data ◽  
Molding Process ◽  
Melt Temperature ◽  
Processing Industry ◽  
Source Models ◽  
Plastics Processing ◽  
Artificial Neural

AbstractThe necessity of an abundance of training data commonly hinders the broad use of machine learning in the plastics processing industry. Induced network-based transfer learning is used to reduce the necessary amount of injection molding process data for the training of an artificial neural network in order to conduct a data-driven machine parameter optimization for injection molding processes. As base learners, source models for the injection molding process of 59 different parts are fitted to process data. A different process for another part is chosen as the target process on which transfer learning is applied. The models learn the relationship between 6 machine setting parameters and the part weight as quality parameter. The considered machine parameters are the injection flow rate, holding pressure time, holding pressure, cooling time, melt temperature, and cavity wall temperature. For the right source domain, only 4 sample points of the new process need to be generated to train a model of the injection molding process with a degree of determination R2 of 0.9 or and higher. Significant differences in the transferability of the source models can be seen between different part geometries: The source models of injection molding processes for similar parts to the part of the target process achieve the best results. The transfer learning technique has the potential to raise the relevance of AI methods for process optimization in the plastics processing industry significantly.

Colorants in plastic applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerhard Pfaff
Keyword(s):  
Current Knowledge ◽  
Review Article ◽  
Important Application ◽  
Processing Method ◽  
Application Systems ◽  
Plastic Type ◽  
Printing Inks ◽  
Cosmetic Formulations ◽  
Plastics Processing ◽  
The Individual

AbstractThis review article is a summary of the current knowledge in the field of plastic coloring. Plastics belong as well as paints, coatings, printing inks, and cosmetic formulations to the most important application systems for colorants, both for pigments and dyes. Colorants have to meet increasing demands in plastic applications due to the growing number of polymers with specific properties. Crucial factors besides the plastic type are the processing method and the required fastness level. Among the most important polymers for coloring with pigments and dyes are polyolefins, polyvinyl chloride, polyurethane, polyamide, polycarbonate, polyester, and elastomers. Different processing methods are used for coloring of the individual plastics. The coloring processes need to be coordinated in accordance with the steps of the plastics processing leading to the final product.

scholarly journals A Technical and Industrial Analysis of Global Plastics Market, Trade, Financing, and Operations

2021 ◽  
Author(s):  
Fatih Selim Yildizhan
Keyword(s):  
Social Life ◽  
Modern Society ◽  
Modern World ◽  
Commodity Trade ◽  
Plastic Recycling ◽  
Solid Objects ◽  
Plastics Processing ◽  
Plastic Industry ◽  
Trade Financing

Plastics are synthetic or semi-synthetic meltable substances that can be modeled in solid objects. In the modern world, it seems impossible today to live without plastic or synthetic polymers, which production and usage only go back to 1950. While plastics play a central role in modern society, the production of safer and cleaner products for potential use is required for decreasing the negative environmental effects. The purpose of this article is to analyze the plastic industry, the role of plastics in our social life, the situation in the plastics market, plastic recycling, and masterbatch compound production. For the purpose of this article, the main markets which have been analyzed are; Europe, Asia, and North America. There is a specific part focusing on Turkey who ranks 6th in terms of plastics processing capacity in Europe and has a huge plastic waste mismanagement problem. Finally, there is an analysis of the financial and operational side of global plastics trading, contract terms, and payment methods, which are being used today by the companies who are operating in the petrochemical industry and commodity trade financing generally.

scholarly journals Modelling and thermal simulation of absorber-free quasi-simultaneous laser welding of transparent plastics

2020 ◽  
Vol 64 (11) ◽  
pp. 1939-1946
Author(s):  
Nam-Phong Nguyen ◽  
Stefan Behrens ◽  
Maximilian Brosda ◽  
Alexander Olowinsky ◽  
Arnold Gillner
Keyword(s):  
Laser Wavelength ◽  
Single Step ◽  
Fibre Laser ◽  
Biotechnological Applications ◽  
Laser Transmission Welding ◽  
Emit Radiation ◽  
Radiation Sources ◽  
Plastics Processing ◽  
Plastic Components

Abstract The growing demands on the quality of plastic components and the trend towards miniaturisation are posing a great challenge on plastics processing technology. As many complex components can no longer be manufactured in a single step, joining processes such as laser transmission welding are gaining in importance. In classic laser transmission welding, the joining partners have different optical properties. The upper joining partner is transparent in the laser wavelength range, whilst the lower partner is absorbent due to the addition of absorber materials. In medical and biotechnological applications, the addition of absorber materials is often undesirable due to strict biocompatibility requirements. If, on the other hand, radiation sources are used which emit radiation in the area of the natural absorption of the plastic (λ = 1600–2000 nm), untreated transparent plastics can also be welded. In this work, a theoretical model will be presented to calculate the temperature distribution and progression during quasi-simultaneous welding using a thulium fibre laser (λ = 1940 nm). A sensitivity analysis is carried out to investigate the influence of different parameters on the heat affected zone (HAZ). The simulated HAZ is then compared with the HAZ from the experimental work.

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