JPH0359807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for heating and casting a composition containing a mixture of natural or synthetic resin components.

In contrast to molding natural or synthetic organic compounds as they are, as a main component, or by mixing necessary additional compositional additives, the present invention is capable of molding the organic compounds into microscopic powders rather than pellets. other ingredients or additional additives are pulverized and mixed, heated and mixed before or after mixing, and then the hot mixed composition is passed through a narrow channel of appropriate size before being poured into a mold. , the cross-sectional area is changed in size and small, and it is made to fluctuate gradually, heating and mixing are made larger than in conventional methods, and ultrasonic vibrations of the required intensity are applied to achieve uniform mixing and uniform heating. The mixture is poured into a mold while heating and molded. By doing so, it is an object of the present invention to provide the apparatus of the present invention to improve the occurrence of so-called mass deviation caused by the difference in mass of molded products in conventional methods and to obtain a uniform composition and perfect molded product.

Next, one embodiment of the present invention will be explained based on the drawings.

FIG. 1 is a side view showing a partially enlarged cross section when applied to an injection molding method according to an embodiment of the present invention;
Figures A and 2B are partially enlarged side sectional views of a partially modified applied embodiment. FIG. 3A is a front sectional view of another embodiment, and FIG. 3B is a partially enlarged detailed view thereof.

In FIG. 1, extremely fine powder 15 made from flakes of synthetic resin or high molecular chemical substances is supplied to a hopper 10 mounted on the upper part of an injection machine 1.
The injection machine is injected from the charging port 10A of the hopper 10, which is formed by mounting an inner shell heated by a solvent or heater 12 for preheating and heating, and an outer shell 13 containing the heater 12, provided at one end of the hopper 1. The required amount is fed into the injection mechanism section 1. A rotary shaft 7 with a diagonal continuous feed screw 6 having a thread close to the inner surface of the inner shell 13 of the illustrated injection machine 1 is rotated to the shaft 18 via a gear 8A of a drive shaft 18 connected to a power source 8. The shaft 7 fixed to the drive shaft 18 is driven, and the threads of the screw 6 are rotated together with the shaft 7 by the inner shell 13, and the heated powder 14 is placed between the threads 6 into the mold 3. send out. A narrow passage body 2 having a zigzag narrow passage 22 whose cross-sectional area changes is provided in front of a mold 3. An example of this is a part where the heated mixed composition A sent out from the injection machine 1 is further heated, pressurized and depressurized in a narrow narrow passage 22 to form a desired mixed composition.

In this way, the zigzag narrow passage 22 not only delivers the composition in the order of delivery, but also allows the composition to flow through the zigzag path while changing the cross-sectional area perpendicular to the flow direction, thereby repeatedly applying pressure and depressurization. By heating the granular material 15 to a high temperature at the top of the zigzag narrow passage 22 approaching the heating device 9, the powder 15 is sufficiently heated little by little. In addition, kneeling is performed in multiple directions such as front, back, left, and right to ensure uniform mixing of the components.
In addition, an ultrasonic generator may be provided in the narrow zigzag passageway 22 to apply ultrasonic waves to the mixed composition to further improve heating and mixing and flow.

The results of a series of tests showed that the gap between narrow passages was 0.1~
The resin pellets are made into a fine powder of 10 to 50 microns, and the required proportions of ingredients are added to form a predetermined composition, heated and mixed. Press to make it flow.

The one in FIG. 2A has a narrow flow path 22 that passes through a part of the mold 3 into the mold cavity 23.
This is an example in which a The same is true for the one in FIG. 23B.

Although not shown, an ultrasonic generator is installed in the narrow, zig-zag flow path 22 in FIGS. 2A and 2B to apply ultrasonic vibrations to the powder and granules. Mixing and flow of the body 15 can be further promoted.

FIG. 3A shows another application example of the apparatus for heating and mixing a mixed molded product. Primary solidified body 25 formed into pellets or powder mixed at an appropriate ratio of the to-be-mixed material
is placed in the hopper 30, and an extremely fine powder is generated between the protrusions 26A of the crushing roll 26 and the protrusions 27A of the roll 27A, and a desired heated mixed composition is formed in the mixing pushing space 28 equipped with a heating mechanism. , causing the narrow zigzag path 22 to flow. During the flow, the required ultrasonic waves are generated and applied using the necessary ultrasonic generators 5A, 5B, and 5C. Ultrasonic waves are applied to the heated mixed composition flowing through the flow path 22 by ultrasonic generators 5A, 5B, 5C as shown in FIG. 3B.
The tip of the horn is placed facing the narrow, zigzag flow path 22, and ultrasonic vibrations are directly applied to the granular material 15.
Although not shown, one end of a wire is connected to the tip of the horn, and the other end of the wire is exposed to the narrow flow path 22, thereby transmitting ultrasonic vibrations to the powder particles through the wire. propagate to the body 15.

As already explained, when molding resins, natural or synthetic organic compounds using conventional injection, extrusion, or other equipment, the required composition of each component to be mixed, additional components, etc. Before pushing the mixture into the mold, it passes through a narrow, zigzag channel to ensure uniform mixing and uniform heating.Additionally, ultrasonic waves are applied to produce a good mixture at the lowest possible temperature and within the shortest possible time. Since the mixture is mixed to produce a good heat-mixed composition, a uniform and good molded article can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged side sectional view of an embodiment of the present invention, FIGS. 2A and 2B are enlarged partially modified views thereof,
FIG. 3A is a side sectional view of another embodiment, and FIG. 3B is a partially enlarged detailed view thereof. 1...Injection machine, 2...Jigzag narrow passage body, 3
...Mold type, 5A, 5B, 5C...Ultrasonic generator, 10, 30...Hopper, 22...Zigzag narrow passageway, 23...Mold empty.

Claims (1)

[Scope of Claims] 1. In molding of natural or synthetic resin, the required proportions of the required components of the object to be molded are forced into the required mold cavity from a mixer. A mold forming device characterized by being provided with a zigzag narrow passage body having a zigzag narrow passage whose zigzag cross-sectional area changes in the front and a heating device for controlling the temperature of the zigzag narrow passage. . 2. In the molding of natural or synthetic resins, a jagged cross-sectional area before being pushed into the required mold cavity from a mixer that mixes the required components of the molded object in the required proportions. A zigzag narrow passage body having a zigzag narrow passageway in which the temperature changes and a heating device that controls the temperature of the zigzag narrow passageway is provided, and ultrasonic vibrations are applied to the mixture flowing through the narrow passageway. A mold forming device characterized by being equipped with an ultrasonic vibration generation mechanism.