JPH0531748A - Glass frame, its part and its molding method - Google Patents

Abstract

PURPOSE:To manufacture a glass frame, slim like a metal frame of superior resistance to heat and resistance to chemicals and hard to break even if it is deformed by injection molding polyphenyl sulfone or polyacryl sulfone under high temperature and high pressure and annealing the same, if necessary. CONSTITUTION:Pellets of polyphenyl sulfone or pofyacryl sulfone are dried at approximately 170-270 deg.C for two hours and a half to remove the water content. The surface temperature of a mold retained at approximately 150-230 deg.C, and dried pellets are heated up to approximately 350-420 deg.C and injection molded under 1000-3000kg/cm<2> injection pressure. Preferably a gate 2 of the mold is thick and the number is increased, if required. For the purpose of improving toughness after molding, annealing is applied at 160-200 deg.C for approximately one hour, if necessary. The secondary process such as cooling, baking or the like can be applied to the surface of said glass frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle frame molded from a special material having superelasticity and high heat resistance, a component thereof, and a molding method.

[0002]

2. Description of the Related Art A spectacle frame is roughly divided into a molding frame obtained by injection molding a resin or the like and a metal frame, each having its own characteristic. The spectacle frame targeted by the present invention is a frame manufactured by the former molding method, but the conventional molding frame is thicker than the metal frame, and the total weight is large even if the specific gravity of the material is small. I will end up. Therefore, the molded frame can never be a slim eyeglass frame.

Since the spectacle frame is not only required to have functionality such as being light and durable in terms of being worn on the face, but also has a high design orientation, the manufactured frame is 2
Most cases are decorated by the next process. Metal frames are decorated with various means such as color plating, painting, printing, etc., but in the case of molded frames, the above-mentioned decoration is due to the low heat resistance and chemical resistance peculiar to the material. There are major restrictions. Further, since the heat-resistant temperature is low, it changes with time due to heat, and the lens fitted to the frame starts to rattle with the passage of time, and finally comes off from the frame by itself. Of course, the molding frame has not only these drawbacks, but also has the advantages that the manufacturing cost is low and the user feels calm.

[0004]

As described above, the conventional molding frame has the above problems. The problems to be solved by the present invention are these problems, and provide an eyeglass frame which has a thin appearance like a metal frame, has high heat resistance and chemical resistance, and is hard to break even when deformed. Yet another object is to provide a method of molding the frame.

[0005]

The molding frame of the present invention comprises a "polyphenylsulfone" or a "polyallylsulfone".
It is a spectacle frame using a material called. The above materials have high superelasticity, high impact resistance and high heat resistance, and have a property of being hard to be broken even if they are deformed, and their applications are used in special fields such as aircraft and medical equipment. The present invention is based on the above-mentioned material properties,
In other words, attention is paid to superelasticity, impact resistance, heat resistance, chemical resistance, etc., and this material is diverted to a spectacle frame, and its injection molding is extremely difficult, but the frame is thin like a metal frame. Configured as a frame.

By the way, injection molding is performed using this material. First, the material is dried to remove the water contained in the pellets, the dried material is heated, and the injection molding temperature is about 350.degree. The temperature is set to 420 ° C to ensure sufficient fluidity of the resin. And the injection pressure is generally 1000 kg /
cm ² ~3000kg / cm ^2, preferably 2000kg / cm ²
Molded by pressurizing to ~ 3000 kg / cm ² , and the molded frame is annealed as required. The annealing temperature is 160 ° C. to 200 ° C. for about 1 hour. Hereinafter, embodiments of a molding frame and a molding method according to the present invention will be described in detail with reference to the drawings.

[0007]

EXAMPLES Table 1 shows the basic physical properties of polyphenylsulfone, which is a material for eyeglass frames according to the present invention. As is clear from Table 1, flexural modulus, Izod impact, and heat distortion temperature are Compared with conventional transparent nylon, it shows a much higher value. In each of these physical properties, bending strength, bending elasticity, and Izod impact contribute to a thin frame, and Izod impact and bending elasticity give superelasticity.

[0008]

[Table 1]

Since the molding frame resin according to the present invention has lower fluidity than the conventional resin due to the above physical properties, injection molding is performed under high pressure and high temperature. Although FIG. 1 shows a general processing step of the present invention, as a preliminary step to be molded, the material pellets are dried. Although the specific means for the drying is not limited, it is performed at a temperature of about 150 ° C. to 170 ° C. for 2.5 hours or more using a dehumidifying dryer or a hot air dryer. This pre-drying is to remove water contained in the pellets and prevent silver strips and blisters from being formed in the molded product, and the temperature is about twice that of conventional materials.

The pellets from which water has been removed through the preliminary drying step are heated to about 350 ° C. to 420 ° C. and fluidized to be molded, but the surface temperature of the injection molding die is about 150 ° C. It is kept warm to ~ 230 ° C. The molding temperature and the mold heat retention temperature are about twice as high as those in the conventional case. In particular, the molding temperature is very high, and the fluidity of the material is improved.

Prior to molding, another material must be cleaned so that the heating cylinder and the screw of the injection molding machine do not remain. This is because the viscosity of this material is extremely high, so that coloration may occur due to mixing of different materials. This is to prevent unevenness or black color. The injection pressure molded under the above molding temperature is 2000 kg / cm ^{2 to} 3000 kg / cm.
² is preferable, and this pressure is 1 compared to the conventional injection pressure.
This is as high as 000 kg / cm ² , and in the present invention, high-pressure molding is performed by heating to twice the molding temperature. Further, it is basically preferable that the injection speed is high.

Further, the molded eyeglass frame parts are optionally heated to about 160 ° C. to 20 ° C. to improve toughness.
Heat to 0 ° C. and anneal for about 1 hour. By the way, as mentioned above, the molding temperature and injection pressure are high,
It is preferable that the injection speed is also high, but the gate of the molding die is larger, and sometimes the number of gates is increased to improve the injection property of the material.

2A and 2B show the positions of the gates 2 arranged in the mold for molding the front frame 1. The number of these gates 2 and their positions are appropriately determined. Of course, not only in the case of the front frame 1 shown in the figure, but also vine or modern molding can be performed, and injection molding with a metal member set in a mold is also conventional. As described above, the molding frame of the present invention is made of polyphenylsulfone or polyallylsulfone as a material and is injection-molded at high temperature and high pressure, and the following effects can be obtained.

[0014]

The spectacle frame of the present invention has a bending elastic modulus,
Because of high Izod impact and thermal deformation temperature, it becomes a thin eyeglass frame having super elasticity and corresponding to a metal frame.
Moreover, it is hard to break even if it is bent or twisted. Furthermore, because of its high heat resistance, it is possible to perform secondary processing on the frame surface after molding, and it is possible to add decoration such as dyeing and baking, which is a colorful molding frame that has not been seen before. Can be obtained. On the other hand, since the high heat-resistant temperature does not change with time due to heat, the phenomenon that the fitted lens rattles or comes off does not occur.

[Brief description of drawings]

FIG. 1 is a process of processing a molding frame according to the present invention.

[Fig. 2] Position of a gate formed on a molding die

[Explanation of sign]

1 front frame 2 gates

Claims (3)

[Claims] 1. A polyphenyl sulfone or polyallyl sulfone material is injection-molded under high temperature and high pressure,
Thereafter, an eyeglass frame and its parts, which are annealed at a predetermined temperature if necessary. 2. The spectacle frame and the component thereof according to claim 1, wherein the molding frame or the component thereof is colored on its surface by dyeing, baking or the like. 3. A molding die made of polyphenylsulfone or polyallylsulfone, dried at about 150 ° C. to 170 ° C. for about 2.5 hours or more to remove water contained in pellets, Surface temperature is about 150 ℃ -230 ℃
Incubate and dry the above pellets to about 3
It was heated to 50 ° C. to 420 ° C., about 1000 kg / cm ² to 30
A method for molding a spectacle frame, which comprises injecting under a pressure of 00 kg / cm ² and then performing annealing at a temperature of about 160 ° C. to 200 ° C. if necessary.