Continuous Recycling of Vulcanisates

2001 ◽  
Vol 28 (6) ◽  
pp. 5-11 ◽  
Author(s):  
K. Fukumori ◽  
M. Mouri ◽  
N. Sato ◽  
H. Okamoto ◽  
M. Matsushita
Keyword(s):  
Shear Stress ◽  
Internal Stress ◽  
Automobile Industry ◽  
Manufacturing Process ◽  
Recycling Process ◽  
Epdm Rubber ◽  
Rubber Waste ◽  
Controlled Conditions ◽  
New Process

Vulcanised EPDM rubber waste produced during the manufacturing process is devulcanised using a screw granulator under controlled conditions of shear stress, temperature and internal stress. During this recycling process, carbon-sulphur bonds are broken selectively so that a devulcanised rubber consisting of a sol component and a gel component is obtained which can be processed like new rubber and re-vulcanised with an accelerated sulphur curing system. The revulcanisates exhibit nearly the same properties as cured new rubber. EPDM rubber which has been devulcanised using the new process is used for the production of rubber products for the automobile industry.

scholarly journals Shear Stress Analysis and Crack Prevention Measures for a Concrete-Face Rockfill Dam, Advanced Construction of a First-Stage Face Slab, and a First-Stage Face Slab in Advanced Reservoir Water Storage

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Kongzhong Hu ◽  
Jiankang Chen ◽  
Dong Wang
Keyword(s):  
Shear Stress ◽  
Internal Stress ◽  
Water Storage ◽  
Water Levels ◽  
Power Station ◽  
Reservoir Water ◽  
Second Stage ◽  
Rockfill Dam ◽  
Concrete Face ◽  
Concrete Face Rockfill Dam

Due to the demand in flood season for power generation, the first-stage face slab of a high concrete-face rockfill dam often must be constructed ahead of schedule, and advanced water storage is needed for the reservoir. Since the dam-body filling has not yet been completed at this point, the internal stress of the first-stage face slab is more complicated than that of normal construction. Taking Buxi Power Station as an example, the first-stage face slab temporary construction seam showed large areas of shear stress damage during the rise in reservoir water levels during the second segment of the second construction stage. The concrete-face slab showed large-piece brittle bulging, and the steel rebar was exposed and developed contortional deformation. Based on the monitoring data for Buxi Power Station along with the first-stage fracture characteristics of Shuibuya concrete face, this paper applied a numerical analysis to conduct research on the causes of fracture mechanics. The results indicate that the cracks occurred on the face slab during the second segment of second-stage water storage primarily due to the advanced concrete pouring of the first-stage face slab; during the first stage of reservoir water storage, the internal stress of the first-stage face slab was not reduced or eliminated prior to second-stage face slab pouring. Thus, with the rise in the reservoir water level, the shear stress increased continuously, eventually leading to partial large-scale shear stress failure of the first-stage face slab. The research results provide important references for the design and construction of concrete-face rockfill dams.

Internal Stresses in Elastohydrodynamic Lubrication of Rolling/Sliding Contacts

1989 ◽  
Vol 111 (1) ◽  
pp. 180-187 ◽  
Author(s):  
Farshid Sadeghi ◽  
Ping C. Sui
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Internal Stress ◽  
Maximum Shear Stress ◽  
Elastohydrodynamic Lubrication ◽  
Normal Pressure ◽  
Internal Stresses ◽  
Stress Distributions ◽  
Principal Stresses ◽  
Dimensionless Velocity

The internal stress distribution in elastohydrodynamic lubrication of rolling/sliding line contact was obtained. The technique involves the full EHD solution and the use of Lagrangian quadrature to obtain the internal stress distributions in the x, y, z-directions and the shear stress distribution as a function of the normal pressure and the friction force. The principal stresses and the maximum shear stress were calculated for dimensionless loads ranging from (2.0452 × 10−5) to (1.3 × 10−4) and dimensionless velocity of 10−10 to 10−11 for slip ratios ranging from 0 to pure sliding condition.

Integrated Eco-Design Tool for Malaysian Automobile Industry

2010 ◽  
Vol 14 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Julirose Gonzales ◽  
◽  
Novita Sakundarini ◽  
Raja Ariffin ◽  
Zahari bin Taha
Keyword(s):  
Automobile Industry ◽  
Manufacturing Process ◽  
Evaluation Methods ◽  
Life Cycles ◽  
Design Methods ◽  
Design Tool ◽  
Design Framework ◽  
Manufacturing Companies ◽  
Automobile Design ◽  
Limited Role

Today’s manufacturing companies are burdened with the pressures of managing their products throughout its life cycles and ensure that their products have minimum impact in the environment through Eco-design methods. This paper looks into the different Product Eco-evaluation methods in terms of Material Recyclability, Manufacturing Process and Disassemblability used for Eco-design, especially in the automobile industry. From these methods, the authors propose an Eco-Design framework suited for Malaysian local automobile SMEs given their limited role in Automobile design.

scholarly journals RECYCLING OF MODIFIED ASPHALT SHEETS FOR AUTOMOTIVE USE

10.6036/10097 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 351-354
Author(s):  
MIGUEL FERNANDO ALDAS CARRASCO ◽  
CRISTINA PAOLA PAVON VARGAS ◽  
ANDRES FABRICIO ACEVEDO DAVILA ◽  
HARRISON DE LA ROSA RAMIREZ ◽  
VLADIMIR VALLE ALVAREZ ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Industrial Scale ◽  
Recycling Process ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Asphalt Mastic ◽  
Minimum Requirements ◽  
Rotational Viscosity ◽  
Parameters Of Interest ◽  
Selection Of

In the present study, the recycling of modified bitumen soundproofing membranes, known as automotive-grade asphalt (ART) membranes, was carried out. The ART sheets were incorporated in the mixing stage of the asphalt mastic, which is part of the manufacturing process of new sheets. The selection of the best asphalt mastic formulation was performed at laboratory scale, where the ATR sheet cutting waste was added to the original asphalt mastic at 2.5, 5.0, 7.5, 10.0 and 15.0 % w/w percentages. The formulations were evaluated for six parameters of interest associated with softening point, rotational viscosity, density, weight per area, thickness and creep. It was determined that the properties of all the formulations studied met the minimum requirements stipulated for the commercialization of the product. The recycling process was carried out on an industrial scale using the formulation with 5% w/w of ATR residues, which presented a viscosity close to that of the original mastic. The results at industrial scale were favorable, since the six parameters of interest were within the ranges established in the regulations.

Use of Surface Fences to Measure Wall Shear Stress in Three-dimensional Boundary Layers

1973 ◽  
Vol 24 (2) ◽  
pp. 87-91 ◽  
Author(s):  
J D Vagt ◽  
H Fernholz
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Skin Friction ◽  
Boundary Layers ◽  
Manufacturing Process ◽  
Three Dimensional ◽  
Calibration Curves ◽  
Dimensional Boundary ◽  
Wall Shear

SummaryIf surface fences are to be applied for measuring skin friction in three-dimensional boundary layers they must be calibrated for both magnitude and direction of the shear stress. Results of the calibration for fences of different height are given. Furthermore, a manufacturing process and a mounting procedure are described to obtain surface fences with identical calibration curves.

Sandwich Manufacturing with Foam Core and Aluminum Face Sheets – A New Process without Rolling

2018 ◽  
Vol 933 ◽  
pp. 3-10 ◽  
Author(s):  
Jörg Hohlfeld ◽  
Thomas Hipke ◽  
Friedrich Schuller
Keyword(s):  
Manufacturing Process ◽  
Rolling Process ◽  
Manufacturing Processes ◽  
Foam Core ◽  
Steel Sheets ◽  
New Process

The manufacturing processes for sandwiches made with aluminum or steel sheets are differentiated by their various melting ranges. Sandwiches with aluminum face sheets have recently been produced using to the so-called AFS technology, which includes a rolling process. However, if it is desirable to avoid rolling to reduce costs and allow for quick and flexible responses to the needs of the customer, the manufacturing process must be redesigned.

scholarly journals Recovery Of Electrodic Powder From Spent Lithium Ion Batteries (LIBs)

2015 ◽  
Vol 60 (2) ◽  
pp. 1145-1149 ◽  
Author(s):  
S.M. Shin ◽  
G.J. Jung ◽  
Woo-Jin Lee ◽  
C.Y. Kang ◽  
J.P. Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Recycling Process ◽  
X Ray ◽  
New Process ◽  
Scanning Electron

Abstract This study was focused on recycling process newly proposed to recover electrodic powder enriched in cobalt (Co) and lithium (Li) from spent lithium ion battery. In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent lithium ion batteries (LIBs) were heated over the range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and atomic absorption spectroscopy (AA) and furthermore image of the powder was taken by scanning electron microscopy (SEM). It was finally found that cobalt and lithium were mainly recovered to about 49 wt.% and 4 wt.% in electrodic powder, respectively.

scholarly journals AN AHP BASED PRIORITIZATION MODEL FOR RISK EVALUATION FACTORS IN THE AUTOMOTIVE INDUSTRY

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Ilker Topcu ◽  
Berna Unver ◽  
Mine Isik ◽  
Ozgur Kabak
Keyword(s):  
Risk Factors ◽  
Automobile Industry ◽  
Manufacturing Process ◽  
Mixed Model ◽  
Product Variety ◽  
Production Quality ◽  
Assembly Lines ◽  
Analytic Hierarchy ◽  
Automotive Manufacturing ◽  
Potential Risk Factors

Due to product variety and modeling structure, the automotive manufacturing process requires state-of-the art production methods that cause a high complexity level in operations which assembly operators work in a mixed-assembly environment. To maintain a competitive advantage, companies should take a different approach that considers the methodologies which ensure excellence in operations. This study aims to identify and prioritize potential risk factors that cause errors and failures by applying the Analytic Hierarchy Process to improve the production quality in a manufacturing process of mixed model assembly lines in the automobile industry. Thus, numerous risk factors under three main categories including human-focused, design and process-driven are discussed in this work. The most important contribution of this study is the application of this methodology to find and rank the risk factors based on their importance in a world-leading automotive company in Turkey.

Abstract 3670: Lean Manufacturing Process Improvement Methods Accelerate and Simplify Transfer of Patients to a Comprehensive Stroke Center

Stroke ◽  
2012 ◽  
Vol 43 (suppl_1) ◽  
Author(s):  
Mary Spencer ◽  
Renee B Van Stavern ◽  
Peter Panagos ◽  
Adrienne Ford ◽  
Brian Hoff ◽  
...  
Keyword(s):  
Performance Management ◽  
Process Improvement ◽  
Manufacturing Process ◽  
Lean Manufacturing ◽  
Stroke Care ◽  
Protocol Implementation ◽  
Future State ◽  
Number Of Patients ◽  
New Process ◽  
Mean Time

Background and Purpose: Acute therapies offered at comprehensive stroke centers require the rapid transfer of stroke patients from outlying hospitals. Here, we describe the application of Lean manufacturing process improvement methods to stroke care in order to accelerate the transfer of patients from outlying hospitals. Methods: A multidisciplinary team of Stroke Neurologists, Vascular Neurosurgeons, ED Physician, Call Center staff and Lean Performance Management Engineers critically evaluated the chain of events required to accept a patient for transfer from outlying hospitals. Barriers and inefficiencies were identified in a “current state” Value Stream Map (VSM). A “future state” VSM created a new process for stroke patient transfer by overcoming the identified barriers and was implemented in March, 2011. Metrics were prospectively collected for a 4-month period prior to (7/1/10-10/30/10) and after implementation of the “future state” VSM (3/1/11-6/30/11), and included: mean time from call start to physician acceptance, percent of calls resulting in acceptance of patients within 15 minutes, total number of patients accepted within 15 minutes over 4 months, and total number of calls. Student’s T-test was used to compare means, while Chi-square test was used to compare ratios. Results: Identified barriers to rapid acceptance of patients included: 1) inefficient distribution of cases between services (neurology vs. neurosurgery); 2) calls frequently transferred from one physician to another on other services; and 3) lack of available beds resulting in acceptance delays. To overcome these inefficiencies, a new process was created with the following changes: 1) alternating call coverage shared between neurology and neurosurgery; 2) immediate acceptance of the patient with behind the scenes patient allocation to appropriate service; 3) direct involvement of patient placement services in transfer process. Mean time to acceptance decreased significantly from 14 min prior to new protocol implementation to 9 minutes (p< 0.03). The total number patients accepted within 15 minutes increased from 186 to 307 during this 4-month period. Percent accepted within 15 minutes also increased from 73% to 92% (p<0.0002). In addition, the rate of patient calls (#calls/month) increased after new protocol implementation (see table ). Conclusions: Lean manufacturing process improvement tools are effective in designing hospital and physician work flow to help improve stroke care. Such practices require a collaborative approach including all parties involved in the process.

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