Resilience Property of Spacer Fabric Compounded PU Foam Composites

2014 ◽  
Vol 910 ◽  
pp. 218-221
Author(s):  
Jia Horng Lin ◽  
Ting Ting Li ◽  
Yu Chun Chuang ◽  
Chen Hung Huang ◽  
Ching Wen Lou
Keyword(s):  
Experimental Result ◽  
Foam Density ◽  
Saving Energy ◽  
Pu Foam ◽  
Spacer Fabric ◽  
Foam Composite ◽  
Opening Ratio

For purpose of saving energy and avoiding injuries, foam composite with excellent resilience property was successfully prepared consisting of inflame-retarding nonwoven, spacer fabric and PU/additive foam. Effects of foam density, additives (vermiculite, perlite) content and opening ratio of spacer fabric on resilience rate were explored respectively. Experimental result shows that 50 kg/m3foam density of PU foam had the lower resilience rate when containing 10 wt%-20 wt% vermiculites. Perlite P2 addition produced optimal resilience property comparing other types of additives in PU foam. Resilience rate decreased with increase of opening ratio of spacer fabric when containing 5 wt% additions.

scholarly journals SARS-CoV-2 Removal with a Polyurethane Foam Composite

2021 ◽  
Author(s):  
Guilherme Pereira Schoeler ◽  
Thays França Afonso ◽  
Carolina Faccio Demarco ◽  
Victor dos Santos Barboza ◽  
Tito Roberto Sant'anna Cadaval ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Social Inequalities ◽  
Low Cost ◽  
Paper Industry ◽  
Expansion Method ◽  
New Materials ◽  
Free Expansion ◽  
Pu Foam ◽  
Foam Composite ◽  
Basic Sanitation

Abstract The pandemic of COVID-19 (SARS-CoV-2 disease) has been causing unprecedented health and economic impacts, alerting the world to the importance of basic sanitation and existing social inequalities. The risk of the spread and appearance of new diseases highlights the need for the removal of these pathogens through efficient techniques and materials. This study aimed to develop a polyurethane (PU) biofoam filled with dregs waste (leftover from the pulp and paper industry) for removal SARS-CoV-2 from the water. The biofoam was prepared by the free expansion method with the incorporation of 5wt% of dregs as a filler. For the removal assays, the all materials and its isolated phases were incubated for 24h with an inactivated SARS-CoV-2 viral suspension. Then, the RNA was extracted and the viral load was quantified using the quantitative reverse transcription (RT-qPCR) technique. The biofoam (polyurethane/dregs) reached a great removal percentage of 91.55%, whereas the isolated dregs waste was 99.03%, commercial activated carbon was 99.64%, commercial activated carbon/polyurethane was 99.30%, and neat PU foam reached was 99.96% for this same property and without statistical difference. Those new materials endowed with low cost and high removal efficiency of SARS-CoV-2 as alternatives to conventional adsorbents.

Effects of Foam Density and Content on Puncture Resistance and Cushioning Properties of PU/ Vermiculite Foam Composites

2014 ◽  
Vol 910 ◽  
pp. 270-273 ◽  
Author(s):  
Jia Horng Lin ◽  
Ting Ting Li ◽  
Yu Chun Chuang ◽  
Chen Hung Huang ◽  
Ching Wen Lou
Keyword(s):  
Impact Load ◽  
Polar Group ◽  
Foam Density ◽  
Puncture Resistance ◽  
Resistance Property ◽  
Foam Composite

This study presents effects of foam density and vermiculite content of puncture resistance and cushion properties of PU/vermiculite foam composite for resisting against sharp objects and impact load. Results show that puncture resistance property improves significantly with foam density and slightly with increase of vermiculites. Cushion property becomes worse lower after vermiculite addition. With improvement of foam density, cushion property shows an uncertain trend. Besides, comparing with different contents of vermiculites, PU/vermiculite foam composite containing 5 wt% vermiculite has the lowest cushion property because vermiculite bonds with polar group among polar group among PU molecular.

Porous Titanium Fabricated by a Combination of Vacuum Distillation and Sintering Process

2018 ◽  
Vol 933 ◽  
pp. 78-85
Author(s):  
Xiao Tong Lu ◽  
Hong Jie Luo ◽  
Wei Yin ◽  
Lin Li Wu ◽  
Qi Le He
Keyword(s):  
Vacuum Distillation ◽  
Volume Fraction ◽  
Porous Titanium ◽  
Raw Material ◽  
Anhydrous Ethanol ◽  
Experimental Result ◽  
Sintering Process ◽  
Magnesium Powder ◽  
Opening Ratio ◽  
And Function

As a new type of material combined with special structure and function, the porous titanium was prepared through vacuum distillation and sintering process, by which the titanium powder was used as raw material, magnesium particles and its powder as space holder, anhydrous ethanol as binder. The porosity of porous titanium obtained by this method is between 35% and 75% and its opening ratio runs up to 95%. The experimental result showed that magnesium existed in the compacted precursor was evaporated rapidly in vacuum when temperature reached 750°C and removed completely within 20 minutes. The suitable sintering temperature was between 1050°C and 1250°C, but the porosity of porous titanium decreased from 76.2% to 61.3% with temperature elevated. The precursor uniformity was improved by addition of anhydrous ethanol and its formability and density was also done by addition of magnesium powder. The relative density of precursor increased from 82% to 98% with magnesium powder volume fraction varied from 30 vol.% to 80 vol.%.

scholarly journals Testing the car seat's comfort

2020 ◽  
Vol 1 (2) ◽  
pp. 141-147
Author(s):  
Adnan Mazari ◽  
Funda Buyuk ◽  
Antonin Havelka
Keyword(s):  
Water Vapor ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Car Seats ◽  
Car Seat ◽  
Pu Foam ◽  
External Cooling ◽  
Spacer Fabric ◽  
Used Car ◽  
Spacer Fabrics

In this paper, four commonly used car seat covers, made from leather as well as from woven, knitted and 3D spacer fabrics are tested as sandwiched and separate layers to determine the effect of the lamination and layers on air and water vapor permeability. Different combinations of interlining materials are also tested to obtain the optimum comfortable car seat cover. This analysis gives us a real idea of which layer negatively affects the breathability of the car seat. The focus of this part of research was to identify the issues within the car seat material instead of factors like external cooling or the clothing of the driver. It was observed that the polyurethane (PU) foam and lamination significantly reduce the permeability of the car seats. The 3D spacer fabric shows the best top layer properties as compared to classical woven, leather or knitted car seat covers. The research shows how layers and lamination cause thermo-physiological discomfort of car seats.

Effect of Vermiculite and Bulk Density in the PU Foam Composite Board for the Absorption Coefficient and Acoustic Impedance

2014 ◽  
Vol 910 ◽  
pp. 82-85
Author(s):  
Y.C. Liu ◽  
J.H. Huang ◽  
C.H. Huang ◽  
M.H. Tsai ◽  
Y.C. Chuang
Keyword(s):  
Composite Material ◽  
Absorption Coefficient ◽  
Bulk Density ◽  
Acoustic Impedance ◽  
Weight Ratio ◽  
Acoustic Characteristics ◽  
Pu Foam ◽  
Foam Composite ◽  
Specific Material ◽  
Two Parameters

This article presents a comprehensive investigation in the acoustic characteristics of flame-retardant PET mesh composite fabric and PU foam with the various bulk density of foam and weight ratio of vermiculite. By using impedance tube, absorption coefficients and acoustic impedance of composite material which play an important roles in the estimation of the wave propagation passing through the specific material will be obtained. Results showed that foam with higher bulk density not only increased the material characteristics in the absorption but more importantly, cause the wider band for absorption. With the inclusion of vermiculites, the level of absorption of composite material will obviously increase, especially for the higher frequencies. Instead of 20wt% for vermiculites, the highest absorption coefficient can be found under the 15wt%. On the other hand, acoustic impedance of composite material presented in this article will slowly decrease with frequencies, and the influences of these two parameters are focused on the lower frequency range.

Experimental investigation of pull-out performance of pedicle screws at different polyurethane (PU) foam densities

2021 ◽  
pp. 095441192110025
Author(s):  
Ahmet Çetin ◽  
Durmuş Ali Bircan
Keyword(s):  
Pedicle Screws ◽  
Poor Quality ◽  
Osteoporotic Bone ◽  
Foam Density ◽  
Pull Out ◽  
Pu Foam ◽  
Screw Diameter ◽  
Critical Materials ◽  
Materials Used ◽  
Force Displacement

Pedicle bone screws are one of the most critical materials used in spinal orthopaedic operations. Screw loosening and pull-out (PO) are basic complications encountered during or after surgery. Pull-out Strength (POS) of the bone is one of the significant parameters to understand the mechanical behaviour of a screw fixed to poor quality or osteoporotic bone. This study investigates how the POS of a pedicle screw is affected by the factors of the screw diameter and the polyurethane (PU) foam density by experimental analysis. In the experiments, two different diameter (5.5 and 6.5 mm) of conical pedicle screws and five different density (0.08, 0.16, 0.24, 0.32 and 0.48 g·cm−3) PU foams were used. According to the force-displacement curves obtained from experimental results, the POS increased with the increases in screw diameter and PU foam density.

scholarly journals Preparation of Polypyrrole/Polyurethane Foam Composite Material

2020 ◽  
Vol 28 (3(141)) ◽  
pp. 69-73
Author(s):  
Yuanjun Liu ◽  
Wenyue Li ◽  
Christopher Kick ◽  
Xiaoming Zhao ◽  
Haiying Wu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Composite Material ◽  
Polyurethane Foam ◽  
Sem Images ◽  
Continuous Layer ◽  
Pu Foam ◽  
Foam Composite ◽  
Scanning Electron

Firstly, the paper focused on the polyurethane foam soaking process with pyrrole solution, and discuss the estimated electro-mechanical properties of the modified PU foam. Secondly, scanning electron microscopy (SEM) micrographs were collected to understand the polypyrrole distribution inside the foam. The results show that the chemical polymerisation parameters needed to realise this amount of polypyrrole in the foam were 0.1 mol/L of pyrrole, a mole ratio of 1:2.25, an oxidation temperature of 12 ± 3 °C, and an oxidation time of 2 hours. SEM images of the samples prepared with the modified approach showed a continuous layer of about 10-15 μm thickness of the polypyrrole attached to the surface of the PU foam.

Organic/Inorganic Acoustic-Absorbing/Thermal Insulating Fiber-Reinforced PU Composite Foam Boards

2015 ◽  
Vol 749 ◽  
pp. 270-273 ◽  
Author(s):  
Jia Horng Lin ◽  
Yu Chun Chuang ◽  
Chen Hung Huang ◽  
Ting Ting Li ◽  
Ching Wen Lou
Keyword(s):  
Carbon Fibers ◽  
Acoustic Absorption ◽  
Curing Process ◽  
Fiber Reinforced ◽  
Composite Foam ◽  
Burst Strength ◽  
Thermal Insulating ◽  
Pu Foam ◽  
Foam Composite ◽  
Reinforcing Fiber

As technology expands rapidly, scientific productions have become an indispensable part for human daily life. Hence, human begin to value environment comfort and functional property. This study purposes to add reinforcing materials, carbon fiber and glass fiber, into polyurethane (PU) foam solvent, and to form PU foam composite board after foaming and curing process. The foaming density and reinforcing fiber were altered during process. The burst strength, acoustic absorption and thermal conductivity of resulting organic/inorganic fiber-reinforced PU composite foam boards were evaluated. Result displays that, 5 wt% additions of carbon fibers improved burst strength and thermal insulation, and maintained the original acoustic absorbing characteristic.

Preparation and Performance Evaluation of PU Foam Composite Board

2013 ◽  
Vol 457-458 ◽  
pp. 40-43
Author(s):  
Jia Horng Lin ◽  
Yu Chun Chuang ◽  
Ching Wen Lou ◽  
Ting Ting Li ◽  
Chen Hung Huang
Keyword(s):  
Living Environment ◽  
Resistance Force ◽  
Curing Process ◽  
Puncture Resistance ◽  
Composite Board ◽  
Pu Foam ◽  
Resistance Property ◽  
Foam Composite ◽  
And Performance ◽  
Addition Amount

As improvement of industry and society, some potential crisis happened in working and living environment is taken into account by human people. Meanwhile, different kinds of protective appliances develop rapidly, and composite boards with cushion and puncture-resistance property are required consequently. This study aims to develop a cushion/puncture-resistance PU foam protective composites. This paper used Polyol and Isocyanate to prepare porous PU foam composite via foaming and curing process. By changing foam density and addition amount, cushion and puncture-resistance property were tested and then evaluated to seek for PU foam composite with cushion and puncture-resistance property. Result shows that, when density was 80 kg/m3, PU foaming composite board had the optimum resilience rate of 44 %, lowest impact remaining load of 638 N and best puncture-resistance force of 138.3 N.

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