Air permeability is the property of a fabric to allow passage of air through it under the effect of a difference in pressure across its two faces. It is defined as the volume of air passing through a defined area under a specified pressure difference over a known period of time. It is a very important property for fabrics which are used under conditions where it is necessary to know precisely the amount of air passing through it.
Test area : 10, 20, 50, and 100 cm²
Rotameters : 9 to 90; 65 to 650; 360 to 3,600; and 1,940 to 19,400 lph atNTP (accuracy ± 3% of FSR in each range)
In this test, four test specimens taken from the fabric under test are simultaneously exposed to a simulated heavy shower of controlled intensity while the lower surface of each specimen is subjected to a rubbing action. The increase in mass of the specimen during exposure to the shower is determined and any water passing through the fabric collected and its volume determined.Related standards
Bursting Strength of any material such as fabric, leather, paper etc. is its strength under multi-directional force and is defined as the hydrostatic pressure required to produce rapture of the material when pressure is applied at a controlled increasing rate through a rubber diaphragm
The GlobeBursting Strength Tester is designed to find bursting strength of fabric / leather / paper / paperboard. A test specimen is held between two annular clamps under sufficient pressure to minimize slippage. The upper clamping surface has a continuous spiral groove and the lower clamping surface has a number of concentric grooves. A circular diaphragm of pure gum rubber is clamped between the lower clamping plate and a pressure cylinder so that before the diaphragm is stretched by pressure underneath it the centre of its upper surface is below the plane of the clamping surface.
The assessment of snap attachment strength is an important criterion of the textiles especially in the design of garments of infants so the Globe Button Snap Pull Tester is designed to test the same. Its user friendly equipment to test ‘Snap strength’ of buttons / rivets/joints to ensure that it meets design tolerance and safety levels, particularly in baby clothing and this is also used to prevent the separation between the snap and the garment.
The salient features are.
The equipment comprises of
a) IMADA Push-Pull force gauge of 20 kgf.
b) Vertical stand to hold the gauge with arrangement to change the position of Gauge.
c) Base which houses the frame to grip the attachment
d) ‘Button’ Pull Fixture – Connected with force gauge.
Suitable to grip buttons from 5 mm to 25 mm.The needle in the gauge stops at the breaking load.
Light Fastness Tester is used to test the colorfastness of the material. For most materials, colorfastness against artificial light is an important property that determines their suitability for many specific end uses. This characteristic is determined by exposing test specimens taken from the sample under test to a controlled intensity of artificial light under a specified humidity and temperature to obtain a specified degree of exposure. The actual degree of exposure is assessed with the help of colorfastness rating standards (blue standards), which are exposed along with the test specimens.
Colorfastness rating is determined with the help of grey scale for change in color.
The weight per unit area or grammage of any material in form of sheets is usually expressed as its GSM, that is its weight in grams per square metre of its area. It is one of the most important parameters to determine the quality of any paper.
In addition to paper, it can also be used for evaluation of grammage of fabrics, coated fabrics, felt, plastic films and sheets, etc.
Different models with single and dual range scales given below are available:
Other scales can also be offered against specific requests.
The Stiffness Tester of fabrics is determined with the help of the cantilever method. In this method a fabric specimen is allowed to bend under its own weight as the length of its overhanging portion is gradually increased. The free length that bends under its own weight sufficiently to make its leading edge intersect a plane at 41.5° inclination to the horizontal and passing through the front edge of the base supporting the test specimen is taken as the measure of stiffness of the fabric.
This method is, in general, more suitable for testing woven fabrics than for testing knitted fabrics. It is not suitable for testing fabrics that are very limp or that curl or twist badly when cut into strips.
Tensile strength and elongation are the two prime characteristics of most of the raw materials, whether they are metals; or non metals such as rubber, leather, textiles, plastic, paper; or finished products such as rods, wires, ropes, yarns, belts etceteras. These two properties often play a major role in determining the suitability of any raw material for any specified application. It is, therefore, of utmost importance to determine these characteristics accurately, conveniently, and quickly.
The Globe Tensile Testing Machines provide a relatively inexpensive way for determining the tensile strength and elongation of a variety of raw materials such as rubber, leather, fabric, plastics, belts, wires, etceteras. They are based on constant rate of traverse principle, in which one end of the test specimen is held in a stationery grip while the other end is moved at a known fixed speed with the help of a motor, gear box, and screw arrangement.
In electronic type tensile testers, the load exerted on the stationary grip is measured by a load cell and is displayed on a digital indicator. The indicator has a peak force retention memory which can be recalled to display the maximum load exerted on the test specimen before its failure. An overload protection relay is provided to automatically stop the motor if the load exerted goes above the maximum capacity of the load cell.
A variety of grips suitable for holding different materials or for conducting different tests is available as optional accessories.
Arrangement to plot load versus elongation graphs can be provided against specific requirement.
Analog Air permeability Tester is the property of a fabric to allow passage of air through it under the effect of a difference in pressure across its two faces. It is defined as the volume of air passing through a defined area under a specified pressure difference over a known period of time. It is a very important property for fabrics that are used under conditions where it is necessary to know precisely the amount of air passing through them.
The Spray Tester is a fairly simple test for assessing the resistance of fabrics or clothing leathers to wetting by water (water repellency). In this test water is sprayed against the taut surface of the test specimen under controlled conditions, producing a pattern of wetting whose size depends on the relative water repellency of the sample. The pattern of wetting is compared against Standard Spray Test Ratings and the sample rated accordingly.
Pilling Tester is a fabric surface fault characterized by little pills of entangled fibres clinging to the surface. These are formed during wearing or washing by the entanglement of the loose fibres, which protrude from the fabric surface, and development of these into spherical bundles anchored to the fabric by a few unbroken fibers. These give a very unsightly look to the garments.
To determine the tendency to form pills, test specimens taken from the fabric sample are rubbed against each other under controlled conditions and the appearance of the test specimen after rubbing for the specified period is compared against standard rating photographs for grading the fabric under test.
Inside dimensions of wooden boxes : 225 x 225 x 225 mm
Round sample cutter for determination of GSM of any material in film form such as carpet, coated fabrics, fabrics, felt, foam, paper or paper board, or plastic sheets is used for preparing test specimens out of the material under test.
The Globe Round Sample Cutter cuts out circular test specimens of 100 cm² area rapidly and accurately. Grammage or GSM of the material under test is determined by multiplying the mass of the circular specimen obtained by 100.
The equipment consists of an aluminum body fitted with a set of four replaceable blades and also provided with safety catch lock. The reversible blades allow the use of all the four edges of each blade. Two special cutting pads are provided with the unit.
The sample to be cut is placed on the cutting pad on which the sample cutter is placed. After releasing the safety catch lock, a slight pressure is exerted on the hand wheel to bring the blades into contact with the fabric. The hand wheel is then rotated under pressure to cut out the specimens.
One of the most common measure of the quality of a fabric is the number of threads per unit length in both the warp and weft directions, or its picks and ends.
Picks and ends of any fabric are normally determined with the help of an ordinary counting glass having a square or rectangular opening of specified size. However, when a greater degree of accuracy in determination of picks or ends is needed, or the weave is too fine to be checked with an ordinary counting glass, this counting is carried out with the help of a Traverse Thread Counter.
In this apparatus a traveling microscope is used for viewing the weave of the fabric under test. Openings of known widths are provided to enable picks and ends per unit length to be determined, both in metric and imperial systems.
Colorfastness of dyed or printed fabrics against perspiration is determined by exposing the fabric sample to the action of both alkaline and acidic reagents while in contact with undyed fabrics on both sides. The test specimens, held between two white adjacent fabrics, are placed between plastic plates under a fixed load inside a hot air oven maintained at 37° C. The apparatus used for this test is called the perspirometer.
The GlobePerspirometer consists of a metallic loading frame and a set of acrylic plates which can be kept in the loading frame.
The loading frame consists of two steel plates separated from each other by four mild steel rods. A set of two mild steel plates held together by means of distance pieces and springs with a dead weight are provided to apply a constant force on the test specimens placed between acrylic plates.
Dimensions of acrylic plates : 11.5 cm x 6.0 cm