JPS5821542A - Flow testing device - Google Patents

Abstract

PURPOSE:To compute a flow of a sample and an apparent viscosity, by a method wherein, after a cylinder, having a nozzle at its lower end, is filled with a sample, the sample is pressed by a plunger to measure displacement of the plunger, loading, and a flow-out time of a sample. CONSTITUTION:After the inside of a heat resisting case 5 is regulated to a set temperature through operation of a heater 6 attached to an inner surface of the case 5, the inside of a cylinder 2 is filled with a sample. With an elevating air cylinder 18 lowered, a downward force is applied to a lever 9 by means of a loading weight 17. The sample is then pressed by a plunger 3 to cause the sample in a fusing condition to flow out through a nozzle 4. Meanwhile, a rectilinear type potentiometer 23 transmits an electric signal, corresponding to the displacement of the plunger 3, to a microcomputer 1, and the computer 1 computes the flow and the apparent viscosity of the sample from data on the flow-out time of the sample and displacement to record them in a printer 30. This permits the reliable and rapid computation of a flow and an apparent viscosity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow tester that heats and melts plastic, etc., and particularly relates to a flow tester that automatically calculates the flow rate and apparent viscosity of a highly viscous fluid.

With the conventional plastic flow tester &C, the flow rate and apparent viscosity of the plastic can be calculated using the secant method from the displacement hourly curve recorded by the recorder attached to the tester. there was.

Calculating the flow rate and apparent viscosity of the plastic according to this calculation method requires an artificial element in reading the data based on the displacement-time curve, and therefore cannot be used to accurately calculate the flow rate or apparent viscosity. However, it was not possible to calculate the viscosity, and the time required for calculation was long.

An object of the present invention is to provide a flow test WS structure that can solve the above-mentioned technical problems and automatically calculate the flow rate and apparent viscosity.

FIG. 1 is a schematic diagram of an internal device of a plastic flow tester according to an embodiment of the present invention. The microcomputer 1 internally includes a read-only memory ROM, a random access memory RAM, a time control unit CLOCK, a central processing unit CPU, etc., and provides control signals and command signals to the internal devices of the flow tester. By performing a series of program controls to be described later, the flow rate and apparent viscosity of the plastic are automatically calculated. The plastic (hereinafter referred to as a sample) whose flow rate and apparent viscosity are to be calculated is filled into the cylinder 2 in the form of powder or granules. The sample filled inside this cylinder 2 is
It is pressed downward by a glazer 3 installed inside the cylinder 2 so that it can slide vertically along the inner periphery of the cylinder 2 . Lower end i of cylinder 2
/cFi, nozzle 4 is formed. Heating, which will be described later,
The sample in the cylinder, which has become molten under pressure, flows downward through this nozzle 4.

The cylinder 2 is also placed in a heat-resistant case 5.
The inner surface of the cylinder 2 and the outer surface of the cylinder 2 are housed so as to maintain a constant distance from each other. A heater 6 is attached to the inner surface of the case 5 facing the outer surface of the cylinder 5. Heater 6
A temperature measuring element 7 is installed on the inner wall of the case 5 in order to measure the temperature inside the case 5 which increases due to the operation of the case 5.

The temperature measuring element 7 generates an electrical signal responsive to the ambient temperature.

In order to receive the electrical signal of the temperature measuring element 7, the first lead #8 extending from the microcomputer 1 is connected to the temperature measuring element 8.
electrically connected to. The lever 9 is supported by a moving fulcrum 10 at one end located on the left side in the figure. Moving fulcrum 1
0 is a fulcrum that can move vertically.

Therefore, when a vertical load is applied to the other end of the lever 9, the lever 9 can smoothly move in the vertical direction while maintaining its horizontal state. One end of a rope 11 is connected to the other end of the lever 9. A balance weight 13 is loaded onto the other end of the rope 11 via a pulley 12. The lever 9 receives a vertically upward force at its other end due to the weight of the balance weight 160. One end of a rope 14 is also connected to the other end of the lever 9. The other end of the rope 14 is wound with a load of 1 load.

The load weight 17 applies a vertically downward force to the lever 9. The balance weight 16 is for smooth vertical movement of the Reno-9.

An air cylinder 1 for raising and lowering the lever 9 is provided on the lower surface of the lever 9.
8 cylinder rods 19 are in contact with each other.

This air cylinder 18 is operated by a solenoid valve 20,
The solenoid valve 20 is controlled by the microcomputer 1. A lifting rod 22 is pin-coupled to the lever 9, the lifting rod 22 is supported by bearings 26, 26, and a linear potentiometer 26 is provided 7 at its upper end. Further, the lower end of the lifting rod 22 is connected to the plunger 6 via a press joint 24 and a relay rod 25.
is connected to.

The linear potentiometer 26 is electrically connected to the microcomputer 1 via a lead wire 27. The linear potentiometer 26 transmits an electric signal corresponding to the displacement of the lifting rod 22 and the displacement (stroke) of the part plunger 3 to the microcomputer 1 via the lead #M27. The microcomputer 1 sends an information signal to the time-stroke display 28 for displaying data regarding the sample outflow time and the stroke from the linear potentiometer 23 on the time-stroke display 28;
Furthermore, an information signal is sent to the temperature display device 29 for displaying the internal zero temperature of the case 5 by the temperature measuring element 6, and the flow rate of the sample calculated based on these data is sent to the temperature display device 29. , the printer 6 sends an information signal that causes the printer 30 to automatically record the apparent viscosity value on the recording paper.
Send to 0.

Next, the sequence in which the flow rate and apparent viscosity of the sample are calculated by the microcomputer 11/c will be explained using the flowchart shown in FIG. Flowchart busy,
The general outline indicates operations that require the operator to be busy.

Turn on the power switch in step ST[. Step 5
At T21C, an information signal is transmitted from the microcomputer 1 to each display device 28, 29 and the printer 60, and the current temperature and stroke are displayed, a busy mark, and a ■ mark are recorded, and at the same time a buzzer sound is generated. In step ST3, the temperature inside the case is controlled to a preset temperature. In step ST4, the inside of the cylinder 2 is filled with a sample and a 1/Zuru closing rod is attached. In step ST5,
Whether cylinder 2 is set in the vertical direction can be determined by force (determined). Cylinder 2 is not set in the vertical direction (N
O), set cylinder 2 in the vertical direction. Cylinder 2 is set vertically (YE
S), press the 5TART key (
Step 5T5). In step ST7, measurement of the preheating time is started, and in step ST8, the preset conditions are read, and either a test under constant temperature conditions or a test under constant temperature increase conditions is selected. be done. When it is determined that the test is performed under constant temperature conditions (constant temperature test), the process proceeds to step ST9. Step ST9
Now, the buzzer will sound in the middle of the preheating time. Then, in step ST1[1, the buzzer sounds again 10 seconds before the preheating time, and the printer 60 starts winding up the recording paper. When winding of the recording paper is started in this manner, the operator removes the nozzle blocking rod in step 5Tll, and in step 5T12, it is determined whether or not the preheating time has ended. When it is determined that the preheating time has ended (YES), in step ST[3, the stroke at that position of the plunger 6 that presses the sample inside the cylinder 2 is measured as φ. Next, in step 5T14, the lifting air cylinder 18 is lowered. When the lifting air cylinder 18 descends, a predetermined pressure P acts on the sample inside the cylinder 2. It is determined in step 5Ti5 whether the stroke exceeds the minimum position. When it is determined that the stroke has passed the minimum position (YES), time measurement is started in the next step 5Tj6. In step 5Tj7, step <. And step 5T1
At 8, it is determined whether the stroke has exceeded the maximum position.

When it is determined that the stroke has passed the maximum position (YES>, the time measurement ends in the next step 5T19. In step 5T20, the remaining sample is pushed out from the cylinder 2, and then in the next step ST2.1 , it is determined whether the stroke is changing or not. If it is determined that the stroke is not changing (YES),
The lever lifting air cylinder 18 rises and pushes up the lever 9, which causes the plunger 3 that was pressing the sample
The load is removed (step 5T22).

In this way, the test for calculating the flow rate and apparent viscosity of the sample is completed, and in the next step 5T23, it is determined whether this test is the first test. 1
If it is determined that it is the third test (YES), the test conditions at that time are set to the printer 6 in the next step 5T24.
Recorded by 0. If it is determined that this is not the first test (NO), step 5T24 is skipped.

In step 5T25, how many times was the test?
The printer 60 records data such as what the flow rate was and what the apparent viscosity was.In step 5T26, it is determined whether or not the lot number test for the sample has been completed.

When it is determined that the lot number test has been completed (YES),
In the next step 5T27, the average value of the data regarding the sample is calculated and recorded. If it is determined that the test for the number of lots has not been completed (NO), step 5T27
is skipped over. In this way, next step 5T
At step 28, the operator cleans the inside of the cylinder and performs the next test.
− to be able to do the following. After step 8T3, when the operator newly sets or changes the test conditions in step 5T29, the operator adjusts the flow rate of the sample,
A test can be performed to calculate the apparent viscosity.

Next, a case will be described in which it is determined in step 8T8 that the test method is a constant rate temperature increase test.

In this test, test conditions are first recorded in step 5T30. The next steps 8T31 to 8T36 are the same as in the constant temperature test. And step 8T3
In step 7, the test temperature is increased at the temperature increase rate that has been set. In step 8T38, it is determined whether or not it is necessary to record data for each set temperature. If it is determined that it is not necessary (No), the process returns to step 8T37, and when it is determined that it is necessary (YES) In the next step 8T39, the stroke change force is measured for 20 seconds. Then, when the amount of stroke change measured in step 8T40 is less than 0.1n (NO), the process returns to step 8T38, and the 0. 1n or more (YFi
8) In the next step 5T41, data regarding the measured temperature, flow rate, and apparent viscosity are recorded. In step 8'l'42, it is determined whether the temperature has reached a predetermined value, and when it is determined that the temperature has reached the predetermined value (yns), the temperature increase is stopped in step 8'l'4t. If it is determined that the predetermined temperature has not been reached (NO), step 8T is performed.
At 44, it is further determined whether the stroke is changing. If it is determined in step 8T44 that the stroke is changing (YB8), step 8T
Returning to step 67, if it is determined that the stroke has not changed (NO), the elevating air cylinder 18 is raised in step 8T45, and the pressurizing load on the sample is removed.

When constant temperature control is performed in step 8T43, the process also proceeds to step 8'I'45. Next, step 8
At T46, it is determined whether or not the temperature has reached the predetermined value, and when it is determined that the temperature has reached the predetermined value (YES), constant temperature control is performed at the predetermined temperature in step s'l'47, and the temperature is maintained at the predetermined value. If it is determined that the temperature has not been reached (NO), control is performed in step 8T48 to return to the original set temperature. After being controlled in this way, the operator cleans the inside of the cylinder and prepares for the next test (step 5T28).
.

The operator can also record test conditions in step 49.

The flow rate Q and apparent viscosity V of the sample are calculated by the following formula (1
) and (2).

Q=-(IIt/dew) (1) where X is the stroke (cm) and t is the time (s[1
c), R is the radius of the nozzle (cIIL), L is the length of the nozzle - m), P is the pressure applied to the sample (dyne/c
IIX).

Examples of data recorded by the printer 60 are shown in FIGS. 3 and 4 according to an embodiment of the present invention.

3 is a record diagram obtained by a constant temperature test, and FIG. 4 is a record record obtained by a constant temperature increase test.

As explained above, according to the present invention, the flow rate of plastic is controlled by a control means such as a micro combinator.
Since the apparent viscosity is automatically calculated, the required flow rate and apparent viscosity can be calculated accurately and quickly.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the internal device of a plastic flow tester according to an embodiment of the present invention, Fig. 2 is a flowchart showing the operating sequence of the apparatus, and Figs. 3 and 4 are a constant temperature test, @speed test, respectively. This is a record of data regarding the flow rate and apparent viscosity of a sample obtained through a temperature increase test. 1 ...Mikle Combiator 12 ...
...Cylinder, 3 ...Plunger, 4 ...Nozzle, 5 ...Case, 6 ...Heater, 7 ...Temperature measuring element , 9...Lever, 17...Load weight, 18...Air cylinder for lifting and lowering the lever, 19...
...Cylinder Rondo, 20...Solenoid valve, 26...Linear potentiometer, 60...
...Printer. Patent Applicant: Shimadzu Corporation Agent Submitted by Patent Attorney 1) New Figure 3 Figure 4 Procedural Amendment Written October 14, 1980 Commissioner of the Japan Patent Office 1, Indication of Case 1982 Patent Application No. 121298 λ Title of the invention: Flow tester 3.Relationship with the case of the person making the amendment:Representative of the patent applicant: Setsu Yokochi, 4,Representative: Miyuki Building 8, 15-13 Usagano-cho, Kita-ku, Osaka-shi.Contents of the amendment: Attached document Contents of the amendment (1) “Plastic” on page 1, line 14 of specification 1
is corrected as "glasstic". (2) Correct it to "rflow"t-"flow" on page 2, line 9 of the specification. (8) Immediately after “time” on page 7, line 10 of the specification, “
Add "End". (4) Correct rO, IJ on page 10, line 20 and page 11, line 1 of the specification as rO, 01J. (5) Amend Figure 1 of the drawings in a separate sheet. lj6 (6J Figure 2 of the drawing is corrected as shown in the attached sheet.

Claims (1)

[Claims] A cylinder with a nozzle at the lower end, a plunger that presses the sample inside the cylinder, a heater that heats the cylinder, a loading means that applies a predetermined load to the plunger, and a first measurement that measures the displacement of the plunger. and a control section that calculates the flow rate and apparent viscosity of the sample from the displacement of the plunger, the load, and the outflow time of the sample.