DE2344898A1 - Testing clothing fabrics for insulation and comfort - using a clay cylinder to simulate heat and humidity of human skin - Google Patents

Abstract

A unit to determine the heat- and moisture-transmission properties of textile fabrics uses a porous clay cylinder for measurement, with a waterproof mantle, with hermetic sealing to allow internal conditions of pressure or vacuum, to simulate the human skin. The system alows conditions of heat and humidity comparable to the human skin to be created, to test the performance of fabrics for insulation and comfort. Specif., the cylinder is filled with water and the fabric drawn over the outside of the cylinder, the temp. being maintained at 37 degrees C. by a thermometer and thermostat through electronic circuitry. The radings can be taken before and after cladding with the test fabric, and the cylinder can be weighed before and after the testo determine the water loss.

Description

MpI. -Phy s . K. Fish him

Ifti. <Terät for determination: the physiological Uärrae and Fcuchtickeilsdurchgangsung of textiles

^ IlLLTIL-.lLL'IlL ^ llll · ^'lli: textile testing. The invention; concerns an Ik i: · :> p _: 'ar-al-ur, nut dor the insulation properties of textiles ■ occupationally the through tariff of V /.^ rmc and moisture determined wcvoon.

7 \: crk : 'heat and moisture ^{resistant bands determine the clothing comfort of f} f ex lilies. Under the simulation of the humidity conditions of the human skin, this I-iel? ;; order should provide quantitative values for the insulation capacity; the Koß results are a prerequisite for a systematic optimization of the wearing properties of clothing textiles. State of the art : The textile tests customary today cover the physical and chemical properties of the clothing materials, eg air permeability, flammability, tear resistance. There are only inadequate methods for measuring the physiologically significant insulation mortality of textiles in terms of combined heat and moisture transport:

a) I ^; ; s'v / ird only the dry heat transfer is measured (EECluiow and w.ü.Rees, Journal of the Textile Institute 59,285 / 1968)

b) Th will enjoy the release of heat and moisture from a wet surface, ie an area with saturated water vapor pressure (GFonseca, Textile Research Journal 40,555 / ^ 970); With this method, it is not possible to measure heat and moisture transport at the same time and to establish typical temperature conditions as they occur in the system of human-clothing-outdoor space.

c) Ks is the combined heat-moisture transport measured (G.G. Cohen and C.A. Baker, American Dyestuff Reporter 21,52 / 1969); However, this method also uses saturation vapor pressure worked, there are only slight variations in the ke £ conditions.

All of the above-mentioned measuring methods require measuring times of several hours and are therefore ineffective for series examinations.

BATH 509812/0912

23AA898

The invention is based on the object of developing a measuring apparatus for the combined internal and external moisture resistance of textiles, which simulates the temperature and moisture conditions and the morphology of the body-clothing-exterior system as accurately as possible, as well as variations in temperature and moisture conditions allows. The object is achieved according to the invention by a porous clay cylinder which is equipped with a heating element, a thermostat, an agitator and two clocks for determining the Uürmeze.it and the total time. Description of the measuring method : The water-filled T'on cylinder is covered with a cover of the clothing material to be measured. The water temperature is kept at 37 C by means of a heating element and thermostat. The heating time in which the heating element is switched on and the total time are measured. The quotient heat zoite / total time is a measure for the moist heat transfer of the textile. For comparison, a measurement is carried out with an unclothed clay cylinder; As a result, the heat dissipation with clothing can be stated in relation to the heat dissipation without clothing. Percent V / ärmeabgabe is a characteristic of the measured garment fabric constant. The water loss can also be determined by weighing the cylinder at the beginning and at the end of the measurement.

Another embodiment of the invention : If the water is not filled directly into the clay cylinder, but in a thin, waterproof plastic cover that fits tightly to the inside of the clay cylinder, the dry heat transfer can be measured under otherwise identical conditions. Another modification: by regulating the pressure in the cylinder, the water diffusion through the walls of the clay cylinder can be continuously regulated. Achievable advantages : Using the apparatus described , the loss of moisture / moisture from the human body can be largely faithfully simulated under very different conditions. The cylindrical geometry is preferred as a replica of the human body or the extremities other geometries. Another advantage is the simple handling and efficiency of the apparatus: the measurements can be taken in non-air-conditioned

5 0 9 8 12/0912

They must be carried out, since one can also take into account fluctuations in the barely there by repeated zero measurements (imbo-mid-cylinder). The measurement of a clothing material can thus be carried out in 2.0 to 50 Mjnuts and provides reproducible ^ i'jv.ebnii t; se with a field of about 3 #; this precision milling machine is typical for such Eoss processes. j ^; : in the exemplary embodiment is shown in the attached drawing; el It.

0 9 8 12/0912 BAD ORIGINAL

Claims (2)

Claims 1. Heating apparatus for determining the physiological heat and moisture transmission of textiles, characterized by the use of a porous cylinder. 2. Modifications to the apparatus of claim 1 which follows Marked are: a) measuring device with porous clay cylinder, b) cylinder lined with a waterproof cover, c) cylinder with an attachment, v / elcher the manufacture of "Overpressure or vacuum inside the cylinder is permitted. 509812/0912