Wyniki wyszukiwania - BazTech

1

Effect of a Superabsorbent for the Improvement of Car Seat Thermal Comfort

Mazari F. B., Mazari A., Havelka A., Wiener J.

Fibres & Textiles in Eastern Europe

|

2017

|

Vol. 25, no. 2 (122)

83--87

EN

The use of super absorbent polymers (SAP) for moisture absorption and comfort is still unexplored. The aim of this work was to observe the application of super absorbent fibres in car seats for comfort purposes. In this research the efficiency of different SAP fibrous webs were determined under different moisture percentages to examine the sorption and desorption efficiency. A SAP fibrous web with low thickness and high moisture absorption were tested with a multilayer sandwich structure of a car seat cover to determine moisture absorption through the cover material. The standard Cup method was used to determine the moisture permeability of different car seat covers with a superabsorbent layer closed with impermeable polyurethane foam. It was observed that the SAP fibrous layers are very effective in absorbing and desorbing water vapour under extremely high and low moisture percentages. In extreme humid conditions (95%RH), 20g of the SAP layer absorbs nearly 70% of its weight in water vapour, reaching the maximum absorption capacity in 6 hours.

PL

W fotelach samochodowych, w celu podniesienia ich właściwości użytkowych, zastosowano włókna superabsorbujące . Badano efektywność różnych tkanin poprzez określenie sorpcji i desorpcji w różnej wilgotności. W celu określenia absorpcji wilgoci przez materiał pokrywający fotele samochodowe badano superabsorbujące materiały włókniste o małej grubości i wysokiej absorpcji wilgoci. Określono przepuszczalności pary wodnej dla różnych pokryć foteli samochodowych. Zaobserwowano, że materiały superabsorbujące są bardzo efektywne w absorpcji i desorpcji pary wodnej w ekstremalnie wysokiej i niskiej wilgotności. W warunkach ekstremalnych, przy wilgotności (95% RH) 20 g warstwy SAP pochłania prawie 70% ciężaru pary wodnej i osiąga maksymalną zdolność absorpcyjną w ciągu 6 godzin.

2

Effect of Perforated Polyurethane Foam on Moisture Permeability for Car Seat Comfort

Mazari F. B., Chotebor M., Naeem J., Mazari A., Havelka A.

Fibres & Textiles in Eastern Europe

|

2016

|

Vol. 24, no. 6 (120)

165--169

EN

Polyurethane (PU) foams are the most essential part of a car seat cushion. PU foams are durable and easily moldable according to the shape of the car seat, but they are poorly permeable to moisture. This impermeability of PU foam causes wetness of the microclimate between the person and car seat and makes it uncomfortable. In this research PU foams with two different thicknesses and three different hole sizes were obtained from industry by the moulding process. The foams were tested for moisture permeability by the standard cup method to determine the effect of the size of the hole on the overall moisture permeability. The foams were further tested with 11 of the most common top layer fabrics to check the effect of the top fabric layer on the overall moisture permeability of the car seat. All the top layers were first tested by means of a sweating guarded hot plate (SGHP) to measure the water vapour resistance (Ret) and then 4 materials with the minimum Ret values were tested with the most permeable foam. The results shows that the perforation of PU foam causes a significant increase in moisture permeability, whereas the top layer with the minimum Ret value decreases the overall moisture permeability and a maximum of 40g/m2 of moisture per hour is obtained with the most permeable foam with the least Ret value of the top layer. This research is an initial work on replacing the car seat with perforated PU-foams.

PL

Pianki poliuretanowe są najbardziej istotną częścią wykładzin siedzeń samochodowych. Są one trwałe i łatwe dostosowują się do kształtu siedzeń samochodowych, ale są niestety słabo przepuszczalne dla wilgoci. Badano pianki poliuretanowe o dwóch różnych grubościach oraz trzech różnych systemach otworów. Pianki badano na przepuszczalność pary wodnej metodą standardową. Pianki sprawdzano następnie łącznie z najbardziej popularnymi pokryciami tapicerskimi. Wszystkie pokrycia wstępnie sprawdzano za pomocą standardowego systemu z gorącą płytą dla pomiarów odporności na przepuszczalność pary wodnej. Cztery wytypowane materiały sprawdzano z najbardziej przepuszczalna pianką. Zastosowana kombinacja materiałowa znacznie polepsza właściwości klimatyczne siedzeń samochodowych.

3

An analysis of effective thermal conductivity of heterogeneous materials

Zhu G., Kremenakova D., Wang Y., Militky J., Mazari F. B.

Autex Research Journal

|

2014

|

Vol. 14, no. 1

14--21

EN

Effective thermal conductivity (ETC) is a very important index for evaluating the thermal property of heterogeneous materials, which include more than two different kinds of materials. Several analytical models were proposed for predicting the ETC of heterogeneous materials, but in some cases, these models cannot provide very accurate predictions. In this work, several analytical models and numerical simulations were studied in order to investigate the differences among them. In addition, some factors which would influence the ETC of heterogeneous materials were investigated by numerical simulation. The results demonstrated that the numerical simulation can provide very accurate prediction, indicated that different analytical models should be selected to predict specific problems based on their assumptions, and suggested that more variables need to be considered in order to improve these analytical models, such as inclusion shape, inclusion size, distribution of inclusions and contact area. Besides, numerical method could be an effective and reliable way to obtain the ETC of heterogeneous materials with any kind of complicated structures.