KR100413565B1 - Improvement of Die-swell tester - Google Patents

Abstract

The present invention relates to a dieswell tester which enables to manage the dimensions of the extrudate in the extrusion process by measuring in advance the expansion of the extruded diameter larger than the diameter of the die when extruding a viscoelastic material such as rubber through the die. will be.

In the constitution, an extruder 10 which is fixed to the frame and extrudes rubber by pressurizing the piston 11, a laser generator 20 which projects a laser beam onto the extrudate 70 extruded from the extruder, and the laser A dieswell tester comprising a detector 30 for receiving and detecting a laser beam projected from a generator, and a recorder 40 for displaying the diameter of the extrudate in graph by transmission of the detector. By installing the extrudate bending roll 60 which rotates in parallel with the direction, the measured value is inaccurate due to the flow of the extrudate generated when the extrudate 70 is deposited in a ring shape in the direction directly below the extruder and the lack of the vertical state of the laser beam and the extrudate. The present invention relates to a dieswell tester that prevents the damage.

Description

Dieswell tester {Improvement of Die-swell tester}

The present invention relates to a dieswell tester, and more particularly, to a structure of a dieswell tester which measures the degree of expansion in which the extrudate extruded through the die expands larger than the diameter of the die when extruding a viscoelastic material such as rubber. will be.

In general, an elastic material such as rubber causes the size of the extrudate extruded through the extrusion die to expand than the size of the extrusion die when extrusion is performed due to the rheological properties of the material.

Therefore, when a certain shape is processed by extruding rubber, the expansion coefficient of rubber acts as an important factor. Therefore, the extrudate expansion rate at the time of extrusion, that is, die-swell, is determined through a test before the extrusion process. It is necessary to measure, and the tester used for this purpose is a dieswell tester.

This dice well shows the degree of expansion in percent (%) and the formula is expressed as follows.

Die-swell (%) =

Where E is the diameter of the extrudate and O is the diameter of the die end.

Since dieswell is a very important factor when extruding viscoelastic materials such as rubber, it is required to accurately measure not to affect the extrusion dimension before the extrusion process. I need a measurement.

Monsanto Processibility Tester is mainly used as a measuring device for measuring dies. The structure of the tester is fixed to the upper side of the frame as shown in FIGS. 1 and 2, and rubber or unvulcanized rubber is applied by pressure of the piston 11. Extruder

10,

A seating plate 51 provided at the lower side of the extruder to deposit the extrudate;

A laser generator 20 for projecting a laser beam onto the extrudate 70 between the extruder and the seating plate 51,

A detector 30 for detecting the laser beam,

It consists of a recorder 40 which graphs the diameter of the extrudate by the transmission of the detector. When projecting the laser beam onto the extrudate, the projected laser beam does not penetrate the extrudate 70. The diameter of the extrudate 70 is continuously recorded in the recorder 40 by detecting the diameter of the extrudate not transmitted through 30 and transmitting it to the recorder 40.

However, the above-mentioned dieswell meter is extruded extrudates as shown in FIG.

When the 70 is loaded on the seating plate 51, the extrudate deposition layer is deposited in a uniform ring shape, and the surface of the extrudate extruded from the extruder is extruded at a constant angle without being perpendicular to the laser beam. .

This problem is caused because the extrudate 70 extruded from the extruder is flowed in a state where it is not projected perpendicularly to the laser beam, so that the diameter of the extrudate is moved and projected and detected in the detector 30, and thus in the recorder 40 There was a disadvantage that the graphed measurements were not accurate.

Accordingly, the technical problem to be achieved by the present invention is to provide a structure of a diewell measuring device of the structure in which the extrudate extruded from the extruder is perpendicular to the laser projected from the laser generator and does not flow in order to solve the above problems.

1 is a schematic diagram of a conventional dieswell tester

2 is a schematic diagram showing the operation of a conventional dieswell tester;

3 is a schematic diagram showing the operation of the dieswell tester of the present invention.

Figure 4 is a comparison table comparing the measurements of the conventional tester and the tester of the present invention

[Description of Major Code in Drawing]

10 ... extruder 11 ... piston

20 ... laser generator 30 ... detector

40 ... recorder 50 ... frame

51 ... seating 60 ... bending roll

70 ... extrudates

The construction for achieving the above technical problem is an extruder fixed to the frame to extrude the rubber by the pressure of the piston, a seating unit provided on the lower side of the extruder is seated, and the extrudate between the extruder and the seating table A laser generator that projects a laser beam,

A detector for receiving and detecting the laser beam projected by the laser generator;

In the conventional dieswell tester composed of a recorder showing the diameter of the extrudate in graph by the transmission of the detector,

And an extrudate feeding roll fixed to an upper portion of the frame and rotated in parallel with the extrusion direction.

Hereinafter, the present invention will be described in detail with reference to FIG. 3.

Fixed to the upper side of the frame 50 of the conventional die well tester is rotated in the same direction as the extrusion direction and the outer peripheral surface to form a bending roll 60 having a guide groove guided by the extrudate 70 is inserted, the The bending roll 60 may be configured to bend the extrudate so that the load of the extrudate is formed on the other side of the extruder, not directly below the extruder, thereby preventing the flow of the extrudate to which the laser beam is projected when the extrudate is loaded.

Referring to the operation, the extrudate 70 extruded from the extruder 10 is transported in the direct downward direction of the extruder by its own weight, and extruded before contacting the seating plate 51 provided in the direct downward direction of the extruder. When the water is wound around the fixing roll 60 fixedly rotated on the upper surface of the frame 50 and the feeding roll 60 is rotated, the extrudate is bent above the seat 51 and the direction is changed to the bending roll 60. Due to the bending of the bending roll 60 is loaded.

Accordingly, the extrudate is bent from the extruder on the seating plate 51 to maintain the vertical state until the direction is changed, and the laser beam is projected in the section maintaining the vertical state. As such, by projecting a laser beam onto the non-flowing extrudate 70, the detector 30 can detect the exact diameter of the extrudate and transmit it to the recorder 40. Accordingly, the recorder 40 can accurately measure the diameter of the extrudate. The diameter of the extrudate will appear as a graph.

(Example)

4 is a graph comparing a specific value of the conventional tester and the present invention tester, the rubber component used as a tire tread is measured using a conventional dieswell measuring device, and the graph output from the recorder is indicated by A, and the present invention is provided. Graphs measured using a dieswell meter were indicated by B. The measurement was carried out in the same manner, the measured rubber temperature is 100 ℃, the speed of the piston to extrude is 8 inches / min, the exact measured diameter of the extrudate was used was 2.18mm.

As shown in the results of FIG. 4, it can be seen that the measured value graph of the conventional dieswell tester is non-uniformly represented by 2.18 mm or more, which is a real measurement value. .

On the other hand, the measured value graph of the dieswell tester of the present invention is uniformly represented by the actual measured value of 2.18mm, so that the laser beam is projected vertically in the absence of the flow of the extrudate so that it can be accurately measured without the error of the measured value.

As described above, since the extrudate extruded from the extruder does not flow perpendicular to the laser beam projected from the laser generator, accurate dice (%) of the extrudate can be obtained, and the accurate data in the rubber extrusion process can be obtained. By using it, there exists an effect which prevents a dimension defect in an extrusion process.

Claims (1)

An extruder 10 fixed to the frame 50 to extrude rubber by pressurizing the piston 11, Laser generator for projecting a laser beam on the extrudate extruded from the extruder 20, A detector 30 for receiving and detecting the laser beam projected by the laser generator; In the dieswell tester composed of the recorder 40 showing the diameter of the extrudate in graph by the transmission of the detector, In the upper portion of the frame, the bending roll 60 is freely rotated so that the extrudate extruded downward from the extruder 10 is continuously bent upwards again and passes around the bending roll 60 and passes downward. Diewell tester, characterized in that to proceed to.