15Oct
15Oct
Determination of paper air permeability
Fundamentals The pressure difference method is used to place the pre-processed sample between the upper and lower measuring surfaces, and a constant pressure difference is formed on both sides of the sample.Under the action of pressure difference, the gas flows from the high pressure side through the sample to the low pressure side, and the permeability of the sample is calculated according to the area, pressure difference and flow through the sample. Definition of breathability Average air flow through paper... 05Jun
Roughness gauges can be paired with several sensors
Roughness gauges can be paired with several sensors When we measure different workpieces, we will match different sensors for measurement.So how many sensors can roughness gauge be matched with?How many sensors are there?The following Xiaobian to answer Sensors are divided into: 1. Standard sensors Standard sensors use the most sensors, it can measure most of the plane, inclined plane, conical surface, inner hole, groove and other surface roughness, can be carried out hand-held measurement, in addition to the standard sensor, other sensors need... 05Jun
What are the factors that affect the measurement accuracy of coating thickness gauge
Description of factors affecting measuring accuracy of coating thickness gauge A) Magnetic properties of the base metal Thickness measurement by magnetic method is affected by the change of the magnetic properties of the base metal (in practical application, the change of the magnetic properties of the low carbon steel can be considered to be slight). In order to avoid the influence of heat treatment and cold working factors, the standard sheet with the same properties as the sample base metal should... 05Jun
Understand the principle and application of surface roughness instrument
Roughness instrument is also called surface roughness instrument, surface finish instrument, surface roughness detector, roughness measuring instrument, roughness meter, roughness tester and other names. It was first developed and produced abroad and then introduced into China. Roughness meter measuring the surface roughness of workpieces, put the sensors on the workpiece surface to be tested, by instrument internal drive mechanism drive the sensor do constant speed glide along the surface to be tested, sharp sensor through the built-in stylus feel the... 05Jun
It is necessary to understand the technical principle of coating thickness gauge
Principle of magnetic suction measurement The amount of suction between the magnet (probe) and the magnetic steel is proportional to the distance between the two, which is the thickness of the coating.Using this principle to make a thickness gauge, as long as the difference between the magnetic conductivity of the coating and the substrate is large enough, it can be measured.Since most industrial products are made of structural steel and hot and cold rolled steel sheets, magnetic thickness gauges are... 15May
What tests should be done to protect film
PE protective film is made of special polyethylene (PE) plastic film as the substrate, polyacid (ester) resin as the main material of pressure sensitive adhesive, and then processed by several special additives.Soft property, good adhesion, easy to stick, easy to peel, peel no glue residue. The parameter viscosity of the protective film refers to the amount and quality of the glue, the quality of the protective film is determined by the quality of the glue and the quality of the... 15May