scholarly journals Process Development of CO2-Assisted Polymer Compression for High Productivity: Improving Equipment and the Challenge of Numbering-Up

Technologies ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 39 ◽  
Author(s):  
Takafumi Aizawa
Keyword(s):  
Pressure Vessel ◽  
Process Development ◽  
Flow Line ◽  
Porous Polymer ◽  
Sample Introduction ◽  
Polymer Materials ◽  
High Productivity ◽  
High Pressure Co2 ◽  
Increase Productivity ◽  
Co2 Flow

The CO2-assisted polymer compression method is used herein to prepare porous polymer materials by bonding laminated polymer fiber sheets using a piston in the presence of CO2. In this work, the CO2 flow line connections were moved from the pressure vessel to the piston to increase productivity, which makes the pressure vessel free-moving and the processing time of sample introduction and removal seemingly zero. In addition, a numbering-up method suitable for CO2-assisted polymer compression is proposed and verified based on the variability of the products. The variability of the product was evaluated using porosity, which is one of the most important properties of a porous material. It is found that the CO2 exhaust process, specific to this method, that uses high-pressure CO2, causes product variation, which can be successfully suppressed by optimizing the CO2 exhaust process.

scholarly journals Model Disiplin Kerja, Iklim Organisasi dan Produktivitas Kerja Pegawai

2018 ◽  
Vol 9 (2) ◽  
pp. 85-92
Author(s):  
Zulfikar Ikhsan ◽  
Suwatno Suwatno ◽  
Budi Santoso
Keyword(s):  
Organizational Climate ◽  
Linear Regression Analysis ◽  
Work Productivity ◽  
Multiple Linear Regression Analysis ◽  
Regional Office ◽  
Managerial Implication ◽  
High Productivity ◽  
Productivity Increase ◽  
Increase Productivity

AbstractDemands for productivity are getting higher. The tight competition among retailers causes companies that do not have high productivity to compete. Quality of HR is the key to success. The purpose of the study was to obtain an explanation of the influence of work discipline and organizational climate on the work productivity of employees at PT. Surya Donasin Regional Office Cianjur, which numbered 59 employees randomly selected. The research method uses explanatory survey with multiple linear regression analysis. Based on the results of the research that productivity as one of the keys to compete in the retail industry is determined by work discipline and organizational climate that supports work productivity. Labor productivity is determined by internal and external dynamics in the form of organizational climate. The managerial implication is that the lack of productivity over employees causes low company productivity. Increase productivity as an option to support work productivity.Keywords : Work discipline; organizational climate; productivity; retailer industry AbstrakTuntutan terhadap produktivitas semakin tinggi. Persaingan yang cukup ketat diantara perusahaan retailer menyebabkan perusahaan yang tidak memiliki produktivitas tinggi kalah bersaing. Kualitas SDM menjadi kunci keberhasilan. Tujuan penelitian untuk memperoleh penjelasan tentang pengaruh disiplin kerja dan iklim organisasi terhadap produktivitas kerja para pegawai di PT. Surya Donasin Regional Office Cianjur yang berjumlah 59 pegawai yang dipilih secara acak. Metode penelitian menggunakan survey explanatory dengan analisis regresi linear berganda. Berdasarkan hasil penelitian bahwa produktivitas sebagai salah satu kunci untuk bersaing dalam industri retail ditentukan oleh disiplin kerja dan iklim organisasi yang mendukung produktivitas kerja. Produktivitas tenaga kerja ditentukan oleh dinamika internal dan eksternal berupa iklim organisasi. Implikasi manajerial adalah lemahnya produktivitas pegawai menyebabkan produktivitas perusahaan rendah. Meningkatkan produktivitas sebagai pilihan untuk mendukung produktivitas kerja.Kata Kunci: Disiplin kerja; iklim organisasi; produktivitas; industri retailer

Cryostructuration as a tool for preparing highly porous polymer materials

2011 ◽  
Vol 2 (5) ◽  
pp. 1059 ◽  
Author(s):  
Harald Kirsebom ◽  
Bo Mattiasson
Keyword(s):  
Porous Polymer ◽  
Polymer Materials ◽  
Highly Porous

Large Deformation Behavior of Porous Polymer Materials With 3D Random Pore Structure: Experimental Investigation and FEM Modeling

2019 ◽  
Author(s):  
Kanako Emori ◽  
Tatsuma Miura ◽  
Akio Yonezu
Keyword(s):  
Plastic Deformation ◽  
Pore Structure ◽  
Creep Deformation ◽  
Deformation Behavior ◽  
Superposition Principle ◽  
Critical Role ◽  
Test Sample ◽  
Porous Polymer ◽  
Polymer Materials ◽  
Polymeric Membrane

Abstract This study investigates the deformation behavior of porous polymer materials with 3D random pore structure. The test sample has sub-micron-sized pores with an open cellular structure, which plays a critical role for water purification. The base polymer is PVDF (polyvinylidene difluoride). First, the surface and cross section of the sample are observed using FESEM to investigate the microstructure (cell size and geometry of the cell ligament, etc). Next, uni-axial tensile loading is carried out for polymeric membrane and it is found that the membranes underwent elasto-plastic deformation. In order to establish a numerical model, finite element metod (FEM) is employed. Using a software of Surface Evolver, 3D random pore structure is created in the representative volume element (RVE). The established computational model can predict both elastic deformation and plastic deformation. Furthermore, viscoplastic deformation behavior (i.e. time-dependent deformation and creep deformation) is investigated, experimentally and numerically. In particular, creep compliance is measured, and we investigate the effect of applied loading on creep deformation behavior. Using the time–temperature–stress superposition principle (TTSSP), we obtain a new master curve, which covers higher stress level, and successfully establish an FEM model of creep deformation of the test sample. The present model enables the prediction of the macroscopic and microscopic deformation behavior of the porous materials, by taking into account of 3D random pore structure.

scholarly journals Preparation of Porous Biodegradable Polymer and Its Nanocomposites by Supercritical CO2Foaming for Tissue Engineering

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Xia Liao ◽  
Haichen Zhang ◽  
Ting He
Keyword(s):  
Carbon Dioxide ◽  
Tissue Engineering ◽  
Polymer Nanocomposites ◽  
Biodegradable Polymer ◽  
Processing Parameters ◽  
Porous Polymer ◽  
Polymer Materials ◽  
Biodegradable Materials ◽  
High Level ◽  
Foaming Technology

Using supercritical carbon dioxide (scCO2) as an alternative to conventional methods in the preparation of porous biodegradable polymer and polymer/nanocomposites for tissue engineering has attracted increasing interest in recent years due to the absence of using organic solvents and the ability to incorporate thermosensitive biologicals without loss of bioactivity. Additionally, scCO2can exert a high level of control over porosity and morphology of scaffolds by tuning the processing parameters. This paper describes the newly achievements on the preparation of porous polymer materials using scCO2foaming technology with focus on the porous biodegradable materials and its nanocomposites relevant to tissue engineering.

Qualification of Polymer Materials for High Pressure CO2 Flexible Pipe Structures

2013 ◽  
Author(s):  
Christian Wang ◽  
Adam Rubin ◽  
Nicolas Von Solms
Keyword(s):  
High Pressure ◽  
Polymer Materials ◽  
Flexible Pipe ◽  
High Pressure Co2

Fabrication Process Development and Characterization of Polymethylhydrosiloxane (PMHS) for Surface-Modified Microfluidic Chips

2007 ◽  
Author(s):  
Mukund Vijay ◽  
Ehson Ghandehari ◽  
Michel Goedert ◽  
Sang-Joon J. Lee
Keyword(s):  
Laser Ablation ◽  
Soft Lithography ◽  
Process Development ◽  
High Surface ◽  
Volume Ratio ◽  
Fused Silica ◽  
Polymer Materials ◽  
Microfluidic Chips ◽  
Separation Processes

Microfluidic chips made of polymer materials such as polydimethylsiloxane (PDMS), polyimide, and cyclic olefin co-polymer have cost and manufacturing advantages over materials such as fused silica and borosilicate glass. While these materials have been extensively investigated, polymethylhydrosiloxane (PMHS) is an alternative that has a unique combination of properties in terms of UV transparency and potential for chemical surface modification. The present study investigates process development and characterization of PMHS as a new candidate material for microfluidic chip applications, in particular separation processes that would benefit from the ability to custom-engineer its surface conditions. This paper compares different approaches for fabricating microchannel features as well as options for enhancing the surface area of the channel walls. The fabrication methods include replication by casting over patterned molds, soft lithography casting, and material removal by laser ablation. Casting into solid form is achieved in 48-hours at 110 °C. Laser ablation is studied with energy dose varying from 2 mJ to 160 mJ per millimeter scanned, with channels approximately 100 microns wide occurring at 0.2 mJ/mm. Mechanical characterization is applied to quantify the hardness of cast PMHS, because fine-resolution features are limited by mold removal. PMHS samples have been measured to have a Shore A hardness of 46.2, similar to PDMS that is well-established in polymer microfluidic devices. Surface enhancement techniques including laser and plasma treatment are investigated for the prospective benefit of separation processes that require high surface-to-volume ratio. Spectrophotometry shows that PMHS exhibits transmittance even below 250 nm, which is favorable for sample analysis by UV absorption methods.

Organic Porous Polymer Materials: Design, Preparation, and Applications

2017 ◽  
pp. 71-150
Author(s):  
Liangxiao Tan ◽  
Kewei Wang ◽  
Qingyin Li ◽  
Yuwan Yang ◽  
Yunfei Liu ◽  
...  
Keyword(s):  
Materials Design ◽  
Porous Polymer ◽  
Polymer Materials

scholarly journals HOW TO INCREASE PRODUCTIVITY IN LODGING SERVICE INDUSTRY IN JAPAN - REFERRING UNIQUE CASES OF BUSINESS HOTEL COMPANIES

2019 ◽  
pp. 107-115
Keyword(s):  
Service Industry ◽  
Academic Research ◽  
High Productivity ◽  
The Future ◽  
Increase Productivity ◽  
Lodging Services

Low productivity is regarded as a problem for Japan's service industry, especially in the lodging services. As a matter of course, improvement of productivity of this industry is required urgently. Therefore, it is necessary to clarify what the academic research has shown about the productivity of lodging services so far. In addition, there are companies that maintain high productivity in this service, it is necessary to derive implications from these cases and to consider the direction of research on productivity of lodging services in the future.

scholarly journals Analysis of Void Growth and Coalescence in Porous Polymer Materials. Coalescence in Polymer Materials

2013 ◽  
Vol 3 (3) ◽  
pp. 452-460
Author(s):  
S. A. Reffas ◽  
M. Elmeguenni ◽  
M. Benguediab
Keyword(s):  
Volumetric Strain ◽  
Polymeric Materials ◽  
Porous Polymer ◽  
Polymer Materials ◽  
Geometrical Shape ◽  
Engineering Applications ◽  
Initial Size ◽  
Advanced Stages ◽  
New Methodologies ◽  
Void Growth And Coalescence

The use of polymeric materials in engineering applications is growing more and more all over the world. This issue requests new methodologies of analysis in order to assess the material’s capability to withstand complex loads. The use of polyacetal in engineering applications has increased rapidly in the last decade. In order to evaluate the behavior, the damage and coalescence of this type of polymer, a numerical method based on damage which occurs following several stages (nucleation of cavities, their growth and coalescence in more advanced stages of deformation) is proposed in this work. A particular attention is given on the stress-strain and the volumetric strain evolution under different triaxiality and for three initial void shapes. Its application to polyacetal allows approving this approach for technical polymers. Finally, this method allow us to compare the obtained results of basic calculations at different triaxiality and to discuss their possible influence on the initial size and the geometrical shape of the porosity on the material failure.

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