What is a horizontal peel tensile tester? Working principle and operation steps 1. Working Principle Horizontal tensile testing machine is a device used to test the tensile properties of materials in the horizontal direction. It usually consists of a...

How is colour fastness rated? Most of the existing colour fastness test methods are based on simulated or combined tests in accordance with the environment and conditions in which they are applied, and the fastness is rated according to the discolouration of the sample and the staining of the lining fabric after the test. What is more special is that the colour fastness to light is rated by blue standard, while the colour fastness to dry cleaning will be rated by solvent staining. In the rating of colour fastness, the changes in the three attributes of colour, i.e. hue, lightness and purity, are assessed comprehensively. Hue refers to the appearance of a colour. Among the three attributes, hue can be used to differentiate between colours. Depending on the wavelength of the light, colours have the properties of red, yellow or green, which are called hues. Depending on the degree of light reflected from the surface of an object, the colour will have a different degree of lightness or darkness which is called luminance. Purity refers to the degree of saturation of a colour, the simpler the wavelength of light, the higher the purity of the hue and vice versa the lower the purity. Colour fastness rating can be divided into eye rating and instrument rating. Gaze rating, the requirements of the background should be neutral grey, similar to the grey sample card between level 1 and level 2 (similar to the Montserrat colour card N5). Lighting conditions should be sunny day light (9:00-15:00), or illuminance in 600lx and above the equivalent light source, incident light and textile surface about 45º angle, the observation direction is roughly perpendicular to the surface of the textile, covering the original sample and test after the sample of the set of plate colour should be the same, it is appropriate to use the neutral colour or grey or black, size and shape are roughly the same. The rating personnel should wear neutral grey overalls, and the rating proces

Aluminium profile coating wear resistance test method analysis Considering the use of aluminium alloy profiles in construction projects, the commonly used testing methods for the abrasion resistance of aluminium profile coatings in China mainly include: (1) the falling sand test method (2) the sand blasting tester method (3) the wheel grinding tester method (4) the Taber test method, etc. It is of great significance to master the characteristics of various testing methods and conduct in-depth analysis and research on the characteristics and standards of various testing methods to ensure the quality of aluminium alloy profiles. It is of great significance to ensure the quality of aluminium alloy profiles. 1.The necessity of aluminium profile coating abrasion resistance test method For aluminium profiles used in construction, the abrasion resistance of aluminium profile coating is an important basis for improving the quality of profiles, and the use of a variety of methods to test the abrasion resistance of aluminium profile coating can reflect the test results of various methods. Our country commonly used falling sand test method to test the abrasion resistance of architectural aluminium profile coating, after experimental research, found that the reproducibility of this test method is poor, the operation is not strong, increasing the difficulty of work. Therefore, in recent years, our country has been on the construction of aluminium profile coating abrasion resistance test, in practice, pay more attention to the use of sand blasting test method, this test method in the operation is very simple, and spend a shorter time. 2. Falling sand test method and evaluation (1) Falling sand test method GB5237-2008 falling sand test method stipulates the abrasion resistance test method of aluminium alloy profiles, taking natural quartz sand as the main abrasion resistant material, the principle adopted in this test method is that the abrasive materia

Acceleration impact tester working principle Acceleration Impact Tester is a machine used to test the ability of a product to withstand impact damage during transport or use. 1.Working principle: (1) By adjusting the falling height of the table top (collision test) or changing the compression of the compression spring (impact test), you can change the acceleration value of the impact pulse. (2) When the table top impact body rises to a certain height, that is, the fall impact on the buffer pad, resulting in a half-sinusoidal impact pulse. (3) Adjust the thickness and material of the cushion can change the duration of the pulse. (4)The DC motor drives the deceleration lifter, with the help of rolling support to push the impact body, the table surface upward movement. (5) Changing the rotational speed of the DC motor can change the repetition frequency of the pulse. 2.Features: (1)High system reliability and complete protection function. (2)Complete impact, collision two kinds of tests (3) Expandable after the peak sawtooth wave and trapezoidal wave and other impact waveforms (4)Closed-loop control of acceleration in collision test, high control accuracy. (5) Photoelectric feedback. (6)High rigidity of working platform, good uniformity of peak acceleration of table surface

Ozone aging tester to evaluate rubber aging performance Ozone aging tester is an experimental instrument to evaluate the aging of rubber. Rubber in the process of thermo-oxidative aging structural changes can be divided into two categories: one is the degradation of the molecular chain of the main thermo-oxidative aging reaction (cleavage); the second is the cross-linking between the molecular chain of the main thermo-oxidative aging (structuring). Natural rubber contains isoprene rubber, butyl rubber, binary ethylene propylene rubber, homopolymerized chlorohydrin rubber and copolymerized chlorohydrin rubber. The appearance of this type of rubber after thermo-oxidative aging is soft and sticky. Butadiene rubber containing cis-butadiene rubber in the process of thermal oxygen aging, the main crosslinking reaction occurs, similar rubber varieties and NBR / SBR / CR / ERDM / FPM / CSM, etc.. This kind of rubber in the occurrence of thermal oxygen aging after the appearance of hardening, brittle. Ozone aging test chamber to assess the rubber aging performance 1. Rubber aging influences the main factors are: (1) oxygen: oxygen in the rubber with the rubber molecules occur free radical chain reaction, molecular chain breakage or excessive crosslinking, causing changes in rubber properties. Oxidation is one of the important causes of rubber aging. (2) Ozone: the chemical activity of ozone is much higher than oxygen, more destructive, it is the same molecular chain breakage, but the role of ozone on the rubber with the rubber deformation and different. When applied to deformed rubber (mainly unsaturated rubber), cracks appear with the direction of stress straight, the so-called “ozone cracking”; role in the deformation of the rubber, only the surface of the oxide film generated without cracking. (3) Heat: Increasing the temperature can cause thermal cracking or thermal cross-linking of rubber. But the basic role of heat or activation. Improve the

Selection of rain test chamber to pay attention to that several aspects Rain test chamber is used in a wide range of products, such as signaling devices and aviation products, automotive lamp shell protection, a large part of these products need to test waterproof performance through the rain test chamber, rain test chamber applications so wide, then how to buy rain test chamber is very important, now we explain. 1. Precautions for the rain test chamber: (1) After the positioning of the equipment, the support frame needs to be propped up to prevent the casters from being shifted by the vibration when the equipment is tested. (2) The rain test chamber longer operation, such as the discovery of water spray holes blocked, must be removed from the pipeline, flushed with tap water and then assembled on. (3) In the operation of the unexpected sound, you need to stop the machine to check, to be found out to solve the problem before reopening, so as not to affect the service life of the equipment. (4)The transmission mechanism must be refueled regularly, and the reducer must be added with clean 20# oil. 2. Price comparison Optional price, measure whether the equipment is a penny a penny, some in order to attract the users of the eyeballs, often pull down the price, no matter how you need to remember one thing, the price is pulled down at the same time its quality is also imaginable, more than a manufacturer is willing to do business at a loss. Therefore, we should consider the cost-effectiveness of the rain test chamber! 3. Size selection Selection of rain test chamber must first be based on the need to test the size of the product, to determine the size they need, there are two common size as an example: According to the principle of environmental test chamber selection, specimen samples and the ratio of the volume of the test chamber should be 1:3, in the purchase of various aspects of the volume you need to consider. 4. Rain test chamber pendulum tube selection The cho