How to use pipe scriber - Huaqiang Electronic Network

RF cable can be customized for other specifications

Photocoupler

LSY-7

Pipe scriber

one,

Pipe scriber

Product introduction:

Longitudinal retraction rate is an important indicator of the performance of plastic pipe products. It reflects the stability of plastic pipe products in the longitudinal plasticity of the pipe under thermal influence. Its measurement is of great significance to improve the ability of the product to withstand changes in temperature, sunlight and other heat sources, and to increase the life of the product. However, due to the diversity of methods for determining the longitudinal retraction rate, we often affect the accuracy of the detection due to improper operation or inadvertent attention.

two,

Pipe scriber

Scope of application:

in accordance with"

GBT 6671-2001

Thermoplastic pipe

Determination of longitudinal retraction rate" Determination of longitudinal retraction rate of plastic pipes.

three,

Pipe scriber

Instructions:

Place the standard sample of the line to be drawn on the two rollers and adjust the distance between the two brushes.

100mm

One of the brushes is at a distance from one end of the tube

10mm

, then turn the handwheel to draw an equidistance on the surface of the specimen

100mm

Two closed circumference lines

(

This length is the distance between the two lines before the experiment.

L0)

. Put the pretreated sample into the oven and heat it up according to the standard requirements, then cool and test the distance between the two lines of the pipe.

Ll

four,

Pipe scriber

Test result processing:

Longitudinal retraction rate

T=

_

L0-L

_

/ L0×100

Description: We draw two distances for each sample

100mm

Circumscribe the line and make it a line at least from either end of the specimen

10mm

. After the line is drawn, we should measure it again and use the measurement result as the original gauge length. Set the oven to the required

150

°C

When the oven reaches the specified temperature, we put the prepared sample. Measure again and use the measurement result as the original gauge length. Set the oven to the required

150

°C

When the oven reaches the specified temperature, we put the prepared sample. It should be noted here that when we put the sample, the oven should be

15min

Within the range, it will rise back to the set temperature. Therefore, we should not put too much sample into the sample, it should be within the range that the oven can withstand, and the action should be slightly faster, so that the temperature inside the oven is not too low. There are two methods for placing the sample here: the first suspension sample, the test is suspended in the oven, the suspension point should be at the farthest end of the line, and the sample should not touch the bottom and wall of the oven. For the second flat sample, the sample should be placed on a flat plate with a layer of talc and placed in an oven. Here we hang the two sets of samples in an oven for heating, and the other two are placed in an oven for heating. Turn off the oven when the oven temperature rises back to

150

°C

Time begins to remember. Placed here as required

60

minute.

60

After a minute, we took the sample out of the oven, placed the two sets of suspended samples flat on a smooth wooden countertop, and placed one on a smooth granite countertop. The other two groups are also placed separately. Wait for the sample to cool completely (

23±2

)

°C

When we measure the maximum or minimum distance between the marking lines, here we should make multiple measurements, choose

Li

The value that makes it the largest relative to the original gauge length is then calculated.