-
Categories
-
Pharmaceutical Intermediates
-
Active Pharmaceutical Ingredients
-
Food Additives
- Industrial Coatings
- Agrochemicals
- Dyes and Pigments
- Surfactant
- Flavors and Fragrances
- Chemical Reagents
- Catalyst and Auxiliary
- Natural Products
- Inorganic Chemistry
-
Organic Chemistry
-
Biochemical Engineering
- Analytical Chemistry
- Cosmetic Ingredient
-
Pharmaceutical Intermediates
Promotion
ECHEMI Mall
Wholesale
Weekly Price
Exhibition
News
-
Trade Service
With the improvement of the speed of the packaging production line, the inappropriate coefficient of friction between the material and the traction rollers and other components in the bag-making process is one of the reasons for the failure of the production line and the increase in the scrap rate of the product, so the coefficient of friction of the test material is the coil (especially the automatic packaging of coils) must be carried out before the machine.
Because the change of ambient temperature will affect the coefficient of friction on the surface of the material, and in practice, the production line should always produce a certain amount of heat when running, so that the equipment internal, surface and nearby space appears to heat up, so the effect of temperature on the coefficient of friction can not be ignored.
In the past, the detection of the friction performance of the material was only carried out at room temperature of 23 degrees C), the test data on the use of the material at high temperature guidance is of little significance, the need for coils in the actual use of the coefficient of friction detection.
To carry out friction coefficient test in the heating environment, if the test equipment has self-control temperature function is good, so that not only the test environment temperature is uniform, but also more convenient to operate, such as Guangzhou standard GM-1 coefficient of friction meter can control the test temperature between room temperature to 99.9 degrees C (test data determination of very warm conditions).
1.GM-1 coefficient of friction meter Introduction GM-1 coefficient of friction meter is mainly used to measure the coefficient of static friction of plastic films and sheets (or other similar materials) and the coefficient of friction when sliding.
by measuring the coefficient of friction of plastic film, the measurement of the smoothness of plastic film, especially for packaging film, is further strengthened, and the instrument is widely used in the packaging industry, inspection institutions and other departments.
looks like Figure 1.
Figure 1 GM-1 coefficient of friction meter appearance Works as shown in Figure 1-2, the sample is cut into two pieces, one of which is clamped on the workbench with a sampler, the other is wrapped around the slider, and then the slider is placed on the sensor's mounting hole, so that the sample moves under the gravity of the slider, that is, the two test surfaces move relative to each other.
signal measured by the sensor is amplified by the integrator ICL7650 and fed into the recorder, recording the coefficient of dynamic friction and the coefficient of static friction respectively.
Figure 1-2 Instrument Schematic 2. The effect of temperature on the coefficient of friction With the increase of temperature, the coefficient of friction of some films will show an upward trend in terms of which this is determined by the characteristics of the polymer material itself, and in the other way with the lubricant used in the manufacture of the film (the lubricant is likely to have approached its melting point and become bonded), after the temperature increases, the fluctuation of the measurement curve increases until the phenomenon of "slip".
in the automatic packaging process, the actual temperature of the equipment because the component running heat dissipation will be higher than room temperature, so it is necessary to detect the friction coefficient of the film at the actual packaging ambient temperature.
it is necessary to detect the coefficient of friction against metal outside the film at high temperature, and it is not desirable to judge the friction performance in high temperature environment only by using the coefficient of friction data at room temperature.
table 1 is the relationship between friction coefficient and temperature of different composite membranes.
Table 1 the relationship between dynamic friction coefficient and temperature of different inner material composite film Table 1 From Table 1, we can see that the friction coefficient of room temperature of the sample (1) is small, but its coefficient of friction above 60 degrees C is large and completely unable to pull.
practice has proved that (1) sample can not run normally on the packing machine, (2) sample can be reluctantly carried out, (3) (4) (5) sample can run well on the packing machine.
3. The deviation coefficient of friction coefficient detection and practical application Of friction coefficient generally detects the coefficient of friction between the thermal seal layer and the heat seal layer of the composite film, in addition to the opening of the bag, the main influence of the composite film coil is the friction coefficient between the inner layer material of the composite film and the guide roller and the molding pipe of the packaging machine, especially the friction coefficient between the inner layer material of the composite film and the molding pipe (generally stainless steel).
coefficient of friction between the heat seal layer of the composite film and the coefficient of friction between the inner layer of the composite film and stainless steel is not necessarily related.