JPH05192989A - Method and apparatus for measuring on-line of melt-index - Google Patents

Abstract

PURPOSE:To obtain a melt-index from the operating date of an extrusion machine regarding a method and apparatus for measuring the on-line of a melt-index without using another melt-indexer particularly. CONSTITUTION:The on-line measuring method and apparatus of an melt-index can measure at on-line a melt-index from at least the temperature data 5A of molten resin, pressure data 4A, weight data 12A or supply resin material weight data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line measuring method and apparatus for melt index, and more particularly, to directly measuring melt index based on operation data of an extruder having each sensor without using a separate melt indexer. For new improvements to do.

[0002]

2. Description of the Related Art As an online method for measuring a melt index of this type which has been conventionally used, for example, an online melt indexer disclosed in Japanese Utility Model Publication No. 1-25305 is used as a cylinder portion of an extruder or a tip portion thereof. It was attached as a separate body to and measured the data.

[0003]

Since the conventional method for measuring the melt index online has the above-described structure, the following problems exist. That is,
In order to mount the melt indexer as a separate unit on the extruder, the cylinder part of the extruder or the tip part of the extruder to which this melt indexer can be attached is required, and at the time of mounting, the dedicated cylinder part or the tip part of the extruder is required. It was necessary to replace it, and this desorption work required a great deal of time and labor.

The present invention has been made to solve the above problems, and in particular, the melt index can be directly calculated based on the operation data of the extruder having each sensor without using a separate melt indexer. It is an object of the present invention to provide an on-line measuring method and apparatus of melt index for measuring.

[0005]

The on-line method for measuring the melt index according to the present invention comprises a molten resin temperature data and a molten resin pressure data obtained from a temperature sensor and a pressure sensor provided in an extruder for extruding a molten resin. , Online measuring the melt index of the molten resin from the molten resin weight data from the weight measuring device for measuring the weight of the molten resin for a certain period of time or the supplied resin material weight data from the resin material supply weight measuring device for a certain period of time Is the way.

More specifically, it is a method of measuring the melt index by adding the characteristic value data of the molten resin.

The melt index on-line measuring apparatus according to the present invention comprises a temperature sensor and a pressure sensor provided in an extruder for extruding a molten resin, and a weight measuring apparatus for measuring the weight of the molten resin or a supplied resin material. Resin material supply for measuring weight, melted resin temperature data from the temperature sensor, melted resin pressure data from the pressure sensor, and melted resin weight data from the weight measuring device for a certain period of time or the resin material supply And a calculation device for inputting the weight data of the resin material supplied from the weight measuring device for a certain period of time.

[0008]

In the method and apparatus for measuring the melt index according to the present invention, the molten resin temperature data and the molten resin pressure data obtained from the temperature sensor and the pressure sensor provided in the extruder itself and the constant data from the weight measuring device are used. The on-line measurement of the melt index can be performed by inputting and calculating the molten resin weight data of time or the supplied resin material weight data of the fixed time from the resin material supply weight measuring device to the arithmetic device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an on-line measuring method and apparatus for melt index according to the present invention will be described in detail below with reference to the drawings. 1 to 6 are for showing an on-line measuring apparatus for melt index according to the present invention, FIG. 1 is an overall configuration diagram, FIG. 2 is a longitudinal sectional view showing a die, FIG. 3 is a transverse sectional view of the die, 4 and 5 are configuration diagrams showing a standard nozzle die, FIGS. 6 and 7 are configuration diagrams showing a nozzle die similar to the standard, and FIGS. 8 and 9 are configuration diagrams showing a nozzle die having an arbitrary size. is there.

In FIG. 1 to FIG. 3, reference numeral 1 is an extruder in which a die 2 is mounted on a cylinder 3, and a pressure sensor 4 and a temperature sensor 5 are mounted on the die 2.

In the vicinity of a nozzle 8 formed in the die 2 for extruding the molten resin 6 from the cylinder 3 as a strand 7, the respective end portions 4a, 5a of the pressure sensor 4 and the temperature sensor 5 are located, Each end 4a, 5a is in direct contact with the molten resin 6.

As shown in FIG. 3, each nozzle port 8a of the nozzle 8 is arranged in a straight line in the horizontal direction, and the plurality of strands 7 extruded from each nozzle port 8a are After being cooled through the cooling tank 9, it is cut by the strand cutter 10 and processed into pellets 11 from which water has been sufficiently removed.

At a position adjacent to the strand cutter 10, a weight measuring device 1 for receiving the pellet 11 is provided.
2 is provided, and the weight of the pellet 11 is measured by the weight measuring device 12 to obtain the molten resin 6
It is configured to be able to measure the weight of.

Molten resin pressure data 4A from the pressure sensor 4 and molten resin temperature data 5 from the temperature sensor 5.
A, a speed signal 10A for detecting the take-up speed of the strand cutter 10, and a melt weight data 12A from the weight measuring device 12 for a certain period of time are input to the computing device 13. The speed signal 10A is obtained so that the molten resin measured by the sensors 4 and 5 and the molten resin measured by weight are the same, and the speed signal 10A is obtained by the arithmetic unit. 13 has been input.

Next, a case where the melt index is actually measured online in the above-mentioned configuration will be described. First, the melted resin pressure data 4A, the melted resin temperature data 5A, the melted resin weight data 12A, the preset resin characteristic values, and the dimensions of the die 2 in use are input to the arithmetic unit 13, and the melt index is calculated. Arithmetic unit 1
Calculate with 3.

The above-mentioned resin pressure measurement is performed at the inlet side of the nozzle 8 (nozzle end on the extruder 3 side), and temperature measurement is also performed for the resin at the inlet side of the nozzle 8.

Therefore, the molten resin temperature data 5A and the shape of the die 2 used are the same as the ASTM or JIS standard, and the molten resin pressure data 4A is the ASTM or JIS.
Pressure equivalent to standard load (standard load is 2.16kg
If the pressure is 3.04 kg / cm ² ), the melt index is given by the following equation (1). MI = 10 · Wn / Nn (1) However, Wn: Weight of discharged pellet per minute (g / min) Nn: Number of nozzles

If the molten resin temperature data 5A or the shape of the die 2 used is not the same as the ASTM or JIS standard, or the molten resin pressure data 4A is not the pressure corresponding to the load load of the ASTM or JIS standard,
The melt index is given by the following equation (2). MI = 10 · Kt · Kp · Kf · Wa / Na (2) However, Wa: weight of discharged pellet per minute (g / min) Na: number of nozzles Kt: temperature correction coefficient Kp: pressure correction coefficient Kf : Nozzle shape correction coefficient Therefore, the online measurement can be performed by repeating the above-described melt index calculation at certain fixed time intervals. The nozzle configuration shown in FIG. 9. FIG. 4 shows those applied to the present embodiment, the configuration standard dimensions of FIGS. 4 and 5, the configuration of FIG. 6 and 7 in similar to the standard, l ₁ / D ₁ = 1
/ D, and the configurations of FIGS. 8 and 9 have arbitrary dimensions and l ₂
/ D ₂ ≠ l / d.

Next, FIGS. 10 and 2 to 6 show another embodiment of the melt index on-line measuring apparatus according to the present invention. FIG.
Is a longitudinal sectional view showing the die, FIG. 3 is a lateral sectional view of the die, FIGS. 4 and 5 are configuration diagrams showing the die of the standard nozzle, FIG. 6 and FIG.
Is a block diagram showing a nozzle die similar to the standard, and FIGS. 8 and 9 are block diagrams showing a die of an arbitrary size.

The extruder 1 has a die 2 mounted on a cylinder 3, and a pressure sensor 4 and a temperature sensor 5 are mounted on the die 2.

Molten resin pressure data 4A from the pressure sensor 4 and molten resin temperature data 5 from the temperature sensor 5.
A, the supplied resin material weight data 22A obtained by measuring the weight of the supplied resin material from the resin material supply device 21 by a resin material supply weight measuring device (not shown) for a predetermined time is the arithmetic unit 1
3 are input respectively. The resin material supply weight measuring device is built in the resin material supplying device or provided independently, and any case is included in the present invention.

Next, a case will be described in which the actual melt index is measured online in the configuration of the other embodiment described above. First, the above-mentioned molten resin pressure data 4
A, the molten resin temperature data 5A, the supplied resin material weight data 22A, the preset resin characteristic value, and the size of the die in use are input to the arithmetic unit 13, and the arithmetic unit 13 calculates the melt index.

The above-mentioned resin pressure measurement is performed at the inlet side of the nozzle 8 (nozzle end on the extruder 3 side), and temperature measurement is also performed for the resin at the inlet side of the nozzle 8.

Therefore, the molten resin temperature data 5A and the shape of the die used are the same as the ASTM or JIS standard, and the molten resin pressure data 4A is the ASTM or JIS.
Pressure equivalent to standard load (standard load is 2.1
When the pressure is 6 kg and the pressure is 3.04 kg / cm ² , the melt index is given by the following equation (3). MI = 10 · Wn'Mn '··· (3) However, Wn ′: Weight of resin material supplied (g / min) for one minute Nn ′: Number of nozzles

If the molten resin temperature data 5A and the shape of the die used are not the same as the ASTM or JIS standard, or the molten resin pressure data 4A is not the pressure corresponding to the load load of the ASTM or JIS standard, the melt index is It is given by the following equation (4). MI = 10.Kt'.Kp'.Kf'.Wa '/ Na' (4) However, Wa ': Resin material weight (g / min) supplied for 1 minute Nn': Number of nozzles Kt ': Temperature correction coefficient Kp ′: Pressure correction coefficient Kf ′: Nozzle shape correction coefficient Therefore, the online measurement can be performed by repeating the above-described melt index calculation at certain fixed time intervals. The nozzle configurations shown in FIGS. 4 to 9 are those applied to the other embodiments. The configurations of FIGS. 4 and 5 are standard dimensions, and the configurations of FIGS. 6 and 7 are similar to the standard. l ₁ /
There is a relationship of d ₁ = 1 / d, and the configurations of FIGS. 8 and 9 have an arbitrary size and l ₂ / d ₂ ≠ l / d.

[0026]

Since the method and apparatus for measuring the melt index online according to the present invention are configured as described above, the following effects can be obtained. That is, the melted resin temperature data, the melted resin pressure data, and the melted resin weight data within a certain period of time of the extruder main body are not separately mounted on the extruder main body as the melt index measuring unit such as the existing online melt indexer. Alternatively, in the present situation where the melt index can be measured online from the weight data of the resin material supplied and the resin characteristic data for a certain period of time, and FA or CIM is becoming widespread, the present invention is essentially a soft element as a main element. Therefore, it is relatively easy to introduce the system of the present invention into an existing system.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a melt index online measuring apparatus according to the present invention.

FIG. 2 is an enlarged vertical sectional view showing the die of FIG.

3 is an enlarged cross-sectional view showing the die of FIG.

FIG. 4 is a front view of a die having a standard (ASTM or JIS) nozzle.

5 is a vertical cross-sectional view of FIG.

FIG. 6 is a front view of a die having a nozzle similar to a standard (ASTM or JIS).

7 is a vertical cross-sectional view of FIG.

FIG. 8 is a front view of a die having arbitrarily sized nozzles.

9 is a vertical cross-sectional view of FIG.

FIG. 10 is an overall configuration diagram showing another embodiment of the melt index online measuring apparatus according to the present invention.

[Explanation of symbols]

 1 Extruder 4 Pressure Sensor 4A Molten Resin Pressure Data 5 Temperature Sensor 5A Molten Resin Temperature Data 6 Molten Resin 11 Pellet 12 Weight Measuring Device 12A Molten Resin Weight Data 13 Computing Device 22A Supply Resin Material Weight Data

Claims (3)

[Claims] 1. A molten resin temperature data (5A) and a molten resin pressure data (5A) obtained from a temperature sensor (5) and a pressure sensor (4) provided in an extruder (1) for extruding a molten resin (6). 4A) and the molten resin weight data (12A) from the weight measuring device (12) for measuring the weight of the molten resin (6) or the resin material weight data supplied from the resin material supply weight measuring device for a certain period of time. (22A) and the melt index of the molten resin (6) are measured online, and the melt index online measuring method is characterized. 2. The method for measuring the melt index on-line according to claim 1, wherein the melt index is measured by adding characteristic value data of the molten resin (6). 3. A temperature sensor (5) and a pressure sensor (4) provided in an extruder (1) for extruding a molten resin (6), and the molten resin.
(6) Weight measuring device for measuring the weight (12) or a resin material supply weight measuring device for measuring the weight of the supplied resin material, the molten resin temperature data (5A) from the temperature sensor (5), the pressure sensor Molten resin pressure data (4A) from (4) and molten resin weight data (1
2A) or an arithmetic unit (13) for inputting the supplied resin material weight data (22A) from the resin material supplied weight measuring apparatus for a certain period of time, and an on-line measuring apparatus for a melt index.