JPS5979725A - Method and apparatus for supplying material to be molded to extruder at constant temperature - Google Patents

Abstract

PURPOSE:To make the melting position of a material constant in an extrusion apparatus, by supplying the material prior to an extrusion process to an extruder at a constant temp. while passing the same through the transfer pipe piercing through a hermetically closed container filled with a heating medium held at a constant temp. CONSTITUTION:A material 11 enters a material delivery apparatus 2 while the amount thereof is appropirately set by a valve 12 and is sent out to a transfer pipe 3 by the air stream flowing therethrough under pressure to be passed through a hermetically closed container 4. Because the material 11 receives heat from a heating medium 45 by contact heat transfer performed between the transfer pipe 3 and the heating medium 45 while passing through the hermetically closed container 4, it is nearly heated to the temp. of the heating medium 45 when issued from the container 4. In addition, because the heating medium 45 is always held to a constant temp. by a temp. control appratus 43, the material 11 is also held at a constant temp. Subsequently, the material is supplied to an extruder through a hopper 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for maintaining a powder or pellet-shaped molding material at a constant temperature before supplying it to an extruder for molding, and supplying the material to the extruder. It is related to.

When making a 1M product into a 1J15 shape, the material is shallowly melted during extrusion molding within the extrusion cost, but the change U1 in the melting point 1a of the material in the extrusion mold affects the quality of the product. It has a huge impact. For example, synthetic resin, ′(,
When the thermoplastic 1 (1 lubricant, e-land is fed to the extruder), the 1st run, r, is heated under a constant 1^λ1 gradient in the above extrusion f-bottle. It rises, reaches a melting temperature of 4 at a certain position, and is extruded toward the C molding, but if the feed rate of the continuous run P is not constant 1~1, the above melting temperature is 1?! The liquid also moves, causing unevenness in the melting during molding and extrusion of the i.1 liquid, which adversely affects the quality of the molded product.

Therefore, in the past, attempts have been made to maintain the material at a uniform temperature by putting the Me material into a container at a constant temperature of υ1, 1, or 1, which has been left indoors for a certain period of time, and then stirring it with a blade or the like. Ta. However, in the former case, it takes an extremely long time for the temperature of the material to stabilize at a certain set value, and this tendency is particularly noticeable in thermoplastic resins, which have low thermal conductivity. Since it is still the latter method and the d1 material is stirred under pressure, air bubbles are removed from the material and the mixed state and density become uneven υ
However, this is not a preferable method because it also has an adverse effect on molding the slag.

The present invention solves the above-mentioned conventional drawbacks, and provides a method and apparatus for feeding the extruder ll'L:IA by keeping the material at a constant temperature without applying pressure during transfer to the extruder.
The purpose of the present invention is to provide a powder bed or pellet-shaped forming material for feeding g fft.
In the case where the material is transferred from the
A method of extruding and supplying a material at a constant temperature by passing through a closed container filled with a heat medium maintained at a constant temperature and exchanging heat between the material and the heat medium through a transfer tube, and its method It is possible to obtain a finished product with a uniform and stable melting state after the drying process is completed.

The embodiments shown in the drawings will be described below. ■ is a tank in which i%g Ic material 11 is stored at room temperature. , 2 is a material feeding device, which is connected to the tank 1 by a pipe 13 via a loop 12 for adjusting the supply amount. A power source for feeding out the material 11, for example, compressed air, is fed into the material delivery device 2.
E Compressed air I Inlet pipe 21 is a knob 2 for fully regulating air 1
It is connected via 2. End interest sending contract: H't 2
A feed basin 3 for transporting the seven ingredients is connected to the bottom of the 1.・K multi-send't? 3 is an airtight container.
I1 to 1 Kodashi 46 (11 temples in preparation for Gin, connected to Yosuru Hotsuno?-5. -t-L, Hotsunozo-5 is extruding machine 6 The extruder 6 has heating parts 1 and 4 (not shown) that heat and melt the material before the extrusion molding process, and has a heating part 1 and 4 (not shown) that extrudes the melt to form the material. It has a die for

To explain the sealed container 4 in more detail, the container is filled with and sealed with a heat medium 45.

This heating medium 45 is supplied with a heat supply fluid, for example hot water, through pipes 41, 42 connected to the closed container 4.

Heat exchange is performed by flowing steam, etc., and the temperature is always maintained at a set constant temperature. Here, it is also possible to use the heat medium itself as the heat supply fluid. Also, in the above, a heat supply fluid was used as an example for heating the material, but if it is necessary to cool the material and maintain a constant temperature, cold water or the like is used. The heat supply fluid is circulated by a pump 46.

The sealed container 4 is further provided with a temperature side interlayer Wt43 for controlling the opening degree of the pulp 44, which detects the temperature of the heat medium 45 and adjusts the supply amount of the heat supply fluid to keep the temperature constant. ing.

In another embodiment, the transfer pipe 3 includes a closed container 4
In order to minimize the space volume within, it is preferable to wind it in a spiral (helical portion 31). In order to meet this requirement, the hermetic container 4 would have to be a round body. Further, when the heat capacity of the heat medium 45 is high, the space required for the heat medium 45 is small, so in such a case, four spirally wound transfer pipes are housed in a sealed container. It can also be a hollow double segment body.

Next, a description will be given of how the above device supplies the material to the extruder at a constant temperature. The materials melted here vary depending on the molded product.

As mentioned above, due to the temperature change before melting, the crystal 1' of the molded product
[This is particularly effective for sensitive materials (powder or pellet) such as thermoplastic resins and thermoplastic resins.

First, the material 11 is appropriately set by the knob 12, enters the material delivery device @2, is sent out by the pressurized air flow flowing through the transfer pipe 3, and passes through the airtight container 4.

When the material passes through the cabinet roof 4, it exchanges heat with the heat medium 45 through contact between the transfer pipe 3 and the heat medium 45, so that when it leaves the closed container 4, it reaches almost the temperature of the heat medium. It has become. Moreover, since the heat medium 45 is always kept at a constant temperature 1 (1) by the temperature control device 43, the material is also kept at a constant temperature.
5 and then fed to the extruder.

As described above, in the present invention, the temperature of the 111 pressers that feed the material to the molding pool is kept constant, so the melting position of the material within the extrusion base is reliably fixed, and after molding. It has become possible to improve product quality and ensure its uniformity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. 2...Material delivery device 3...Transfer pipe 4...Airtight container 45...Heating medium 6...Extruder patent applicant Kureha Chemical Industry Co., Ltd.

Claims (1)

[Claims] (+) Before the extrusion process, the material to be extruded is passed through a transfer pipe passing through a closed container filled with a heating medium kept at a constant temperature. A method in which the formed cable trunk is fed to an extruder at a constant temperature. (2) A method for supplying a molding material to an extruder at a constant temperature according to claim (1), wherein the material is a thermoplastic resin. (3) Claim (2), characterized in that the thermoplastic resin is a thermoplastic resin compound;
([Claims (1) to (3) of the claims, characterized in that the molding material described in [7] is fed to an extruder at a constant temperature. (4) Element (E) is in powder form. A method of feeding a molding material to an extruder at a constant temperature according to one of claims 1 to 3, wherein the material is in the form of pellets. A method of supplying the molding material described in one of li to an extruder at a constant temperature. A device that extrudes the molding material at a constant temperature and supplies it to the seashore, which is characterized by passing through 11 closed containers that can be filled with a heat medium kept at a constant temperature. A device for supplying a molding material according to claim (6) to an extruder at a constant temperature, characterized by a rolled core. (8) A patent characterized in that the airtight container is a cylindrical body. A device for supplying the molding material according to claim (6) or (7) to an extruder at a constant temperature. (9) The closed container is a hollow double-walled container that houses a spirally wound transfer pipe. RF'F characterized by being a cylindrical body
The molding material described in claim (8) is defined as +7! A device that feeds the extrusion to the rock.