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Test standard and operation method of melt index measuring instrument
Add time:2016-03-27 Views:2910
Melt index tester testing standard and method of operation include product testing equipment to provide to share with you.
1, melt index measuring instrument ready to work
(1) charging and discharging tube
Reclaiming barrel, with a large screw knife the barrel out, release the arrow direction rotating loosen, the material cylinder r arc furnace mouth screw alignment, vertical gently removed from the bottom upwards pushing until, but not overexert, or pounding, avoid the cylinder is broken.
When the feeding tube is loaded, the R arc of the barrel is aligned with the screw nail of the furnace body and the furnace is gently sent into the furnace, and then the lock is locked with a screwdriver.
Note: when you take a hot barrel to bring gloves to prevent hand burns.
(2) die
The pulling plate of the furnace body is pushed along the horizontal direction, and then the mouth mold is gently put into the material barrel with a cleaning port mold bar.
(3) the piston sleeve on the guide sleeve together with the barrel.
(4) connected to the instrument power supply, temperature setting dial dial to the desired temperature value, began to heat up, such as digital thermometer shows the temperature reaches the set temperature value, and constant temperature for 30 minutes. The internal standard switch according to the account, the temperature display and the number of instructions given in standard values are consistent, inconsistent with screwdriver to adjust. Error allowed + 0.1.
(5) choose the working conditions, set the working mode:
Set sampling method, sampling time.
In the automatic measurement, the load weight should be selected according to the instruction weights, and the dial code of the combined table 2 is set to be sent to the computer.
(6) other preparations
Weight according to the required load weight
Clean the barrel, clean the mouth mold, and prepare the material.
To get a pair of heat-resistant gloves. (thick cloth gloves can be)
It is equipped with a precision balance accuracy is higher than 1/1000 and a small tray balance.
2, melt index tester test
(1) sample preparation
Samples (granular, strip, sheet, molded block, etc.) in accordance with the requirements of the plastic type before testing for drying treatment.
(2) according to the predicted melt flow rate of the sample, the sample is called as the sample in Table 3.
(3) the selection of the plastic test conditions by Table 4 serial number.
Polyethylene 1, 2, 3, 4, 6
Poly formaldehyde 3
The 7,, 11, 13, 5
ABS 7, 9
Polypropylene 12, 14
Polycarbonate 16
Polyamide 10, 15
Acrylic ester 8, 11, 13
Cellulose ester 2, 3
Note: the types of plastics such as copolymerization and blending can refer to the above classification test conditions.
(4) charging
When the stable temperature setpoint following (general constant temperature for 30 minutes after) will remove the preheating of the piston, the remaining sample with hopper into the barrel in, and the piston material compaction (to reduce the air bubbles) the whole process of feeding and compaction shall be completed within 1 minute.
(5) sampling
After the specimen is loaded by hand or with small weight pressure, the piston rod of the ring as a marker (groove) in 5 minutes (loading and constant temperature time and together) to guide sleeve on the surface of 5 ~ 10mm away from the, and then with the selected test load, the current ruling into the barrel, established according to the sampling were cut into samples.
When the automatic measurement mode is selected, the displacement sensor box is first used on the furnace body, and the lead rod on the A weight is aligned with the tablet pressing on the electric potential sensor to carry out automatic measurement. Again, it is necessary to measure the density of the melt at the time of the automatic measurement. (the density at room temperature value) two density values are not the same, density after measuring, according to the numerical toggle density disc will density value is sent to the computer, to do a second pass of the print out of the data is the correct value.
Manual sampling method:
The sampling mode switch dial hand control file, and at the same time according to the motor control switch and an electronic stopwatch reset switch, cut knife to rotate a week cut have been out of the sample, also electronic stopwatch timing starts. When the electronic stopwatch to you need cutting time again pressing the motor control switch system, cutting knife and then rotate a week cut specimen, the specimen, the effective, in turn, cut take 3 to 5 no bubble specimen can be.
Time controlled sampling method:
Will be sampling switch dial at the appointed time control gear, according to what you need cutting time dial dial sampling time and according to motor control switch, cut knife rotating around the computer starts a timer, and trim have been out of the sample, when the computer timing to you set the cutting time, electric machine automatic rotation, began to cut into samples, which in turn cut take 3-5 bubble free sample can be.
Automatic measurement method:
In the automatic measurement, we first need to measure the density of the melt and calculate the density of the melt. Then the automatic measurement can be carried out, and the results are true.
The density measurement method:
The sampling method switch to automatic file, there are two kinds of density measurement methods, one is the fixed distance 6.35mm (generally smaller melt flow rate is used) the other is the distance 25.4mm.
3 melt index measuring instrument setting operation method:
(1) operation
When setting the distance 6.35mm, the sampling time dial to 0000.
When setting the distance 25.4mm, the sampling time is set to 9999.
After the method is set, the displacement sensor box is leaned on the furnace body, and the A weight is sheathed on the piston rod, and the guide rod of the A weight is pressed in the center position of the tablet press. (at the same time, the tablet will be placed in the middle position of the opening of the displacement sensor box, in order to prevent the compression plate and sensor box generated friction) and then add the load has been selected, you can automatically measure.