JPH03213325A - Molding method and equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a molding method that improves the flow of material within a molding member such as a die during molding, and improves the productivity of molded products. Regarding equipment.

E. Prior Art] In recent years, molding materials such as plastics have been made to have higher molecular weights or
Progress is being made in increasing the amount of fillers such as inorganic substances.

However, plastic materials that have been improved in this way have poor fluidity within the die during extrusion molding, resulting in surface roughness of the molded product called melt fracture, or the pressure inside the die is extremely high. get higher,
Since there is a risk that the die may deform and the molded product becomes distorted, it has been necessary to reduce the extrusion speed, that is, the production speed, in order to prevent this.

Therefore, several proposals have been made to solve the above problems by improving the fluidity of the molding material within the die during molding.

For example, one method is to increase the extrusion speed by improving the fluidity of the molding material by applying mechanical vibration to the die of the molding machine and causing the molding material to flow.
No. 7-51441) has been proposed.

[Problems to be Solved] However, the conventional extrusion molding method described above has the following problems.

That is, since vibrations are forcibly applied to a die that is simply fixed to an extrusion molding machine, there is a problem in that almost no vibration is actually transmitted, making it impossible to obtain satisfactory results.

The present invention has been made in view of the above problems, and
By applying traveling wave vibrations to the molding member in the flow direction of the molding material and generating a force that moves the molding material in contact with the molding member in the flow direction, the flow of the molding material is promoted, and especially the viscosity is reduced. A molding method that improves the flow of high-quality molding materials in molded parts, dramatically improving molding productivity, and making it possible to extrude extremely thin products using these materials, and this method. The purpose of the present invention is to provide a molding device that can smoothly carry out the process and has a reasonable structure.

[Means for Solving the Problems] In order to achieve the above object, a method of molding a molding material using a molding member is a method in which molding is performed while the molding member is vibrated by a traveling wave.

Further, in an apparatus that performs molding by supplying molding material from a molding machine to a molding member, a vibration generating means that is coupled to a predetermined surface of the molding member to generate vibration, and a vibration generator that generates vibrations from the vibration generating means are provided. The structure includes a vibration absorbing means for absorbing vibrations.

Specifically, the molding method of the present invention is carried out as various molding methods using dies, molds, etc., such as injection molding, extrusion molding, blow molding, and compression molding.

Also, the molded part is rice in which the molding material flows inside. Refers to parts such as molds.

[Example] Examples of the above solution will be described below.

First, an embodiment of the molding apparatus will be described based on FIG. FIG. 1 is a cutaway side view of essential parts of an extrusion molding apparatus according to an embodiment of the present invention.

In the same figure, l is a die, and one end face has an extrusion port 1b.
It is equipped with Various materials can be used for the die l, such as metal, ceramics, graphite, etc. Among these materials, it is preferable to use a material with low transmission loss of ultrasonic waves at the molding temperature, and in particular, aluminum , duralumin, titanium alloy, monomonel, phosphor bronze, and graphite are preferable.Furthermore, the die 1 can be divided into two or more parts, and the shape of the extrusion port 1b can also be arbitrarily selected.

Reference numeral 2 denotes an ultrasonic vibrator as a vibration generating means, which is connected to the molding material inlet 1a portion of the die 1 via a horn 3 that increases the vibration amplitude.

4 is a nozzle of the extrusion molding machine, which passes through the center of the horn 3 from this nozzle 4, and further passes through the inlet 1a to the die 1.
The nozzle 4 is positioned approximately at the node of the ultrasonic vibration il+ (displacement waveform) in the horn 3, and is finally extruded from the extrusion port 1b. It is fixed to horn 3.

Reference numeral 5 denotes an ultrasonic oscillator, which causes the ultrasonic vibrator 2 to generate ultrasonic vibrations, excites the horn 3 at the resonance frequency, and gives the die 1 vibration.

A vibration absorbing means 6 is provided at the end of the molding material in the flow direction of the die 1 and absorbs vibration waves oscillated from the ultrasonic vibrator 2 . As the vibration absorbing means 6, a member having an impedance different from that of the die 1, or a vibrator having the same characteristics as the ultrasonic vibrator 2 can be used. Vibration absorbing means 6
When an ultrasonic vibrator is used as the oscillator, it is preferable to use a structure in which the vibration energy transmitted from the die 1 is consumed by, for example, providing a dummy resistor.

In addition, longitudinal vibration,
It is possible to use known vibration motes such as transverse vibration, torsional vibration, flexural vibration, radial vibration, and one-rotation vibration.

It is possible to provide the die l with a mechanism for changing the direction of vibration, and it is also possible to perform surface treatments such as plating and coating.

In addition, as a vibration generating means, a vibrator, an electrodynamic vibrator,
The frequency of vibration, such as an electro-hydraulic vibrator, is 10 Hz to 10
I can name something that vibrates in the range of MH. A plurality of vibration generating means can be connected to the die 1 at the same time.

Here, it is possible to increase the effect of the traveling wave by combining a plurality of vibration generating means and, for example, by slightly shifting the oscillation times.

Next, an example of the extrusion molding method of the present invention carried out using the above extrusion molding apparatus will be described.

The nozzle 4 of the extrusion molding machine is connected to the die 1, and the molding material is supplied to the die 1 to perform extrusion molding, and the die 1 is also make it vibrate.

The vibration frequency at this time can be selected arbitrarily, or ultrasonic vibration can be used to improve the flow of the molding material.
It is preferable to set the frequency to 100 KH.

Furthermore, in order to effectively improve the flow of the molding material, the amplitude of the vibration given to the die 1 should be o, 1 to 100.
It is preferable to use gm.

Molding materials that can be molded using the extrusion molding method and equipment described above include organic materials such as plastics, inorganic polymers, ceramics, metals, inorganic materials such as glass, other food products, and mixed materials thereof. Mention may sometimes be made of materials that have at least some fluidity. In particular, when applied to plastics, the occurrence of melt fracture can be reduced and molded products with high product value can be obtained.

Here, the following plastics can be mentioned.

α-olefin resins (polyethylene, polypropylene, polystyrene, synthiotactic polystyrene 2) are used as thermoplastic resins.
Vinyl chloride resin, polymatene, ultra-high molecular weight botethylene, polymethylpentene, ionomer, polybutylene, etc.] Botester resin (polyethylene terephthalate, polybutylene terephthalate, polyarylate, etc.) Polyether resin (polysulfone, polyethersulfone, polyetherketone) , polyether ether ketone, polyallyl sulfone, polyoxybenzylene, polyphenylene oxide, polycyanoallyl ether [JP-A-62-223226], etc.) Polycarbonate resin Polyimide resin Polyamide resin Polyamide imide resin Methacrylic resin Fluorine resin MBS (methacrylate phtadiene styrene) resin AAS (acrylate acrylonitrile styrene)
Resin AS (Acrylonitrile Styrene) Resin ACS (Chlorinated Acrylonitrile Polyethylene Styrene) Resin ABS (Acrylonitrile Butadiene Styrene)
ResinsPolyacetal resinsCellulose resinsPolyvinylidene chlorideChlorinated polyethyleneEVA resins (ethylene vinyl acetate, etc.)Polyurethane resinsSilicone resinsAllyl resinsFuran resinsLiquid crystalline polymers Epoxy resinsPhenolsJIM4 fatPolyamide resinsSilicone resins as thermosetting resins Thermoplastic elastomers such as unsaturated polyester resins, amino resins, styrene-butadiene elastomers, polyester elastomers, polyethylene elastomers, urethane elastomers, vinyl chloride elastomers, etc.

The molding method of the present invention is applicable to molding materials in a fluid state, such as inflation molding, two-sheet molding, round bar molding, pipe molding, profile extrusion molding, multilayer coextrusion molding, blow molding, wire coating one-foam extrusion, and monofilament molding. It can be used for any extrusion molding process in which it passes through a die to extrude it into a predetermined shape, and can be used for injection molding, compression molding, pultrusion molding, etc.

[Experimental Example] Hereinafter, the results of an experiment conducted using the extrusion molding method and apparatus of the present invention will be explained while comparing with a comparative example.

Experimental Example Extrusion Molding Apparatus: The apparatus shown in FIG. 1 Under the above conditions, extrusion molding was carried out while the die was longitudinally vibrated by a traveling wave, and the occurrence of melt fractures at that time was investigated. In addition, the pressure inside the nozzle, which is a measure of the flow resistance of the molding material generated from the nozzle to the die, was measured at an extrusion rate of 0.5 kg/hr.

Table 1 shows the results of the experimental examples.

Comparison 1 An experiment was conducted under the same conditions as in the experimental example except that the ultrasonic oscillation was stopped.

Table 1 shows the results of comparative examples.

Table As a result, by applying traveling wave vibration to the dice,
It has been found that not only the flow resistance of the molding material is reduced, but also the occurrence of melt fracture can be suppressed even at extremely high extrusion speeds, thereby improving productivity.

[Effects of the Invention] As described above, according to the extrusion molding method of the present invention, by applying traveling wave vibration to the molding member in the flow direction of the molding material, the molding material in contact with the molding member is caused to flow. Promotes the flow of the molding material by exerting a force to move it in the direction, improves the fluidity of the molding material, especially materials with poor fluidity, in the die, reduces the occurrence of melt fractures, and improves the productivity of molded products. It is possible to improve dramatically.

Further, according to the molding apparatus of the present invention, it is possible to improve the fluidity of the molding material and improve productivity, and the molding method of the present invention can be carried out in an unreasonable manner.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view of essential parts of an embodiment of the molding apparatus of the present invention. l: Dice 1a: Inflow port 1b Extrusion port 2 Ultrasonic vibrator 3" horn
4: Nozzle 5 Ultrasonic oscillator 6: Vibration absorption device (vibration absorption means) Idemitsu Kosan Co., Ltd. Seidensha Electronics Co., Ltd.

Claims (2)

[Claims] (1) A method for molding a molding material using a molding member, characterized in that the molding is performed while the molding member is vibrated by a traveling wave. (2) In an apparatus that performs molding by supplying molding material from a molding machine to a molding member, a vibration generating means is coupled to a predetermined surface of the molding member to generate vibration, and vibrations oscillated from the vibration generating means are provided. A molding device characterized by comprising a vibration absorbing means for absorbing vibration.