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...

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...

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...

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...

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...

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...

Simulated transport vibration table operating steps

The simulated transport vibration table is suitable for vibration test of toys, electronics, furniture, machinery, ceramics, communications, equipment, computers and automobile parts, etc., which is used to inspect the effect of transportation resistance or even durability.The operating procedures are as follows: 1. Place the required test products in the middle of the workbench. 2. Loose the black plum handle, fix the test product firmly, and then tighten all the screws of the plum handle. 3. Check whether the above equipment has collision...

carton compression testing machine common Fault Analysis

 The mechanical system failure of the carton compression testing machine 1. The wear and elongation of the lower transmission chain affects the normal operation of the main engine. Because the chain shaft or chain chip hole wear after long-term use increases the chain perimeter, the chain tensioning wheel position should be adjusted. 2. The parallelism between the upper and lower pressing plates is out of tolerance, which affects the test accuracy. A. The elongation of the chain causes relative angular displacement of the...