JPS6336272Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on die swell, which is one of the characteristics of molten polymers when they flow out from a heated barrel through a capillary. shape,
This invention relates to a die-swell device for measuring the bulge position etc. using a laser beam and determining the characteristics of a sample.

The contents will be explained below based on the illustrated embodiment.

Reference numeral 1 denotes a main body of the testing machine, which mainly consists of a barrel 2 for melting the sample, a die/swell measuring device section 3, and a load cell section 4 with an overload safety device.

A piston 6 is provided in the hollow through hole 5 of the barrel 2.
The molten sample 7 is extruded as appropriate. 8 heats the barrel 2 with a band heater wrapped around the barrel 2 to open the hollow through hole 5.
A molten sample 7 is obtained by melting the pellet-shaped plastic sample filled inside the tube. 9 is a temperature measurement sensor that employs a thermocouple or the like. 10 is a temperature regulator heat sensitive body. Reference numeral 11 denotes a heat insulating material filled in the case 12, which is made of perlite, glass wool, or the like.

Reference numeral 13 denotes a capillary whose portion 3 of the die swell measuring device is made of a special material.
It is removably attached to the discharge opening 15 of. The molten sample 7 melted in the barrel 2 is pushed out by the movement of the piston 6 in the direction of arrow A, and is pushed out into the air from the capillary 13, and at the same time swells into a unique shape depending on the material. The position of the bulge also varies, with some samples starting to bulge near the discharge port of the capillary 13, and some samples bulging after being extruded into a filament to some extent.

16 is a die/swell measuring device for measuring the bulge shape, bulge position, etc. of the molten sample 7 extruded from the capillary 13; specifically, it is composed of a helium-neon gas laser beam transmitter 17 and a receiver 18; It has been done.

This laser beam uses a reciprocating scanning method (1000 times per second), so the molten sample 7 is oscillating as it travels.
The shape of the bulge can be measured with high accuracy and stability.

19 is the lower side of the capillary 13, and is provided to prevent the temperature from dropping rapidly while measuring the bulge shape of the extruded molten sample 7 with a heat insulating cover detachably attached to the case 12. There is.

Generally, the molten sample 7 extruded from the capillary 13 swells, but if the air temperature, that is, the ambient temperature is low, the size and shape of the swell will be affected and the original properties will not be exhibited. This prevents a sudden drop.

Reference numeral 20 is a transparent glass cylinder that allows the laser beam to pass through easily, and is supported by a metal holder 21. 22A is a ceramic heater attached to the holder 21 for keeping the temperature inside the heat insulating cover 19 constant.

Thus, the molten sample 7 extruded from the capillary 13 swells within the heat insulating cover 19, and the shape of the swell is measured by a laser beam.

After the measurement, the molten sample 7 is wound up into a thread by a winding machine (not shown).

Next, the load cell portion 4 with an overload safety device will be explained.

An overload response member 22 is provided at the top 6A of the piston 6.
are pressed against each other and are configured to move within the overload stationary member 23. 24 is an overload response member 22
A press cap 26 and a screw 27 are attached to the upper step 25 of the
This is a rig-shaped overload safety plate made of metal and is sandwiched between the upper surface 23A of the overload immovable member 23 and the lower surface 28A of the safety plate holding member 28 in the shape of a sanderch.

Therefore, when an overload is applied to the piston 6 in the direction of arrow B, the overload responsive member 22 moves to the overload immovable member 23.
The overloaded immovable member 23 moves in the direction of arrow C.
Overload safety plate 2 held under clamping pressure between upper side 23A and lower side 28A of safety plate holding member 28
A shearing force acts on the overload safety plate 24 and the overload safety plate 24 is cut.

Therefore, it is possible to prevent overload from being applied to the load cell 4A.

29 is a switch operating rod attached to the flange 30 of the overload responsive member 22, which loosely fits through the flange 31 of the overload immovable member 23, and its tip 32 is attached to the safety plate holding member 28.
It is designed to appropriately contact the contact arm 34 of No. 3.

When an overload is applied to the piston 6 and the overload response member 22 moves in the direction of arrow C, the switch actuating rod 29 also moves in the same direction, and the tip 32 turns the micro switch 33 on and turns the motor off. The circuit and other electrical circuits (not shown) are cut off, rendering the entire test machine inoperable.

The micro switch 33 is operated at the same time as the overload safety plate 24 is disconnected.

35 is a lead screw rod that moves vertically while being rotated by a motor (not shown), and is usually installed in a cylinder 36 and inside the cylinder 36 by a rotation/straight translation mechanism (not shown). Load cell 4A,
The safety pressing member 28, the overload immovable member 23, the overload responsive member 22, and the piston 6 are configured to move up and down integrally.

37, heat from the piston 6 heated by a cooling fan provided in the cylinder body 36 is transferred to the overload response member 2.
2. Overload immovable member 23, safety plate holding member 28
This prevents the signal from being transmitted to the load cell 4A via the.

38 is a support plate supporting the barrel 2, and 39 is a spherical receiving seat.

Next, the operation of the present invention having the above configuration will be explained.

The molten sample 7 melted in the barrel 2 is transferred to the capillary 13 by the movement of the piston 6 in the direction of arrow A.
It is extruded from the inside and then expands inside the heat insulating cover 19.

At this time, the laser beam P emitted from the laser beam transmitter 17 passes through the glass cylinder 20 of the heat-insulating cover 19 and reaches the receiver 18 in order to measure the bulge shape of the extruded molten sample 7. In this way, the shape of the extruded molten sample 7 that swells while moving can be measured.

Since the present invention has the above-mentioned structure and operation, the bulge shape, bulge position, etc. of the molten sample 7 that is extruded from the capillary and swells can be measured with high precision using a laser beam, and the correct characteristics of the sample can be determined. There is an effect that can be known.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the principle of the device of the present invention, Figure 2 is an enlarged front view showing the bulge of the molten sample extruded from the capillary, and Figure 3 is an overall schematic diagram of the main body of the tester, showing the barrel part in cross section. There is. Figure 4 is a perspective view of the heat insulating cover, Figure 5 is a longitudinal sectional front view of the load cell section with an overload safety device in the main body of the test machine, and Figure 6 is an explanatory diagram of the switch operating lever, an enlarged vertical sectional view of the main parts. , FIG. 7 is a cross-sectional plan view taken along line X--X in FIG. 5. 1... Testing machine body, 2... Barrel, 7... Molten sample, 13... Capillary, 17... Laser emitter, 19... Heat insulation cover, 22... Overload responsive member, 23... Overload Fixed member, 24... Overload safety plate, 28... Safety plate holding member, 29...
Switch operating rod.

Claims (1)

[Scope of utility model registration request] A capillary 13 is attached to the discharge opening 15 of the barrel 2.
The capillary 13 is removably attached to the capillary 13.
A heat insulating cover 19 made of a transparent glass cylinder 20 is disposed near the sample extrusion, and the molten sample 7 formed in the heat insulating cover 19 is bulged in order to measure the bulging shape of the extruded molten sample 7 with a laser beam. Die-swell device in a polymer capillary flow property tester.