JPS6095422A - Production of fiber-reinforced plastic spectacle frame and its parts - Google Patents

Abstract

PURPOSE:To provide excellent strength and to obtain slim and good design characteristics by disposing reinforcing fiber groups in a compressed state along the shape lines of frame parts and molding the parts with a synthetic resin while the fiber groups are superposedly entangled with each other in at least the joint part between a rim and a bridge. CONSTITUTION:Frame parts such as a rim 1, bridge 2, temple 3 are disposed with reinforcing fiber 4 groups in a compressed state along the shape lines thereof and the fiber groups 4, 4 contained in both parts 1, 2 are molded by using a synthetic resin while said groups are superposedly entangled with each other in the joint part between the rim 1 and the bridge 2. Carbon fibers, glass fibers or synthetic fibers are used for the reinforcing fibers. A thermosetting or thermoplastic resin is used for the synthetic resin molding the fiber 4 groups and the fiber 4 groups are formed of the assemblage of long fibers. Lighter weight and excellent strength are simultaneously obtd. by plastic spectacle frames 1, 2, 3 obtd. by such FRP and the fashionable element is thoroughly satisfied as well.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ta fiber-reinforced plastic eyeglass frame and a method for manufacturing the same, and an object of the present invention is to provide fiber-reinforced plastic eyeglasses that are lightweight and surprisingly strong at a low cost. There is something to do.

As is well known, plastic eyeglass frames have the advantage of being lightweight, but have the disadvantage that they are extremely thick compared to metal-rimmed eyeglass frames due to two-strength constraints. For these reasons, research has recently begun on reinforcing plastic eyeglass frames with fibers (so-called rFRP for plastic eyeglass frames). In the case of modern eyeglass frames, which require guarantee of the finning angle when worn (2) and strong durability, it is not possible to simply use conventional FRP technology to strengthen the product. Therefore, it was not possible to move on the path of reform.

This is because previous attempts to make eyeglass frames from FRP were exclusively aimed at molding predetermined eyeglass parts using injection molding methods from fiber-reinforced thermoplastic resin pellets.
This is because fibers cannot be intertwined or tangled in the weld line, which occurs at the farthest point from the injection port of the mold, and as a result, the strength must be extremely inferior compared to other locations.

The present invention was made with the main purpose of overcoming the above-mentioned bottlenecks in the production of FRP plastic eyeglass frames, and by shaping the plastic with a clever arrangement of reinforcing fibers, The objective of the present invention is to realize a fiber-reinforced plastic eyeglass frame that has excellent physical strength, is extremely slim, and has a rich design, and a rational manufacturing method thereof.

Thus, according to one invention: (1) A rim 1. as shown in the illustrated embodiment. Bridge 2. Frame parts such as the temple 3 have reinforcing fiber groups 4, 4, etc. arranged in a compressed state along the shape line thereof, and are included in both parts at least at the joint between the rim 1 and the bridge 2. A fiber-reinforced plastic eyeglass frame characterized by forming a synthetic resin with fiber groups 4, 4, etc. intertwined in a stacked manner; (2) A rim shape, a bridge shape, or a temple shape. After arranging a large number of reinforcing fibers impregnated with 2 synthetic resin in a semi-hardened state along the cavity shape line inside a mold cavity shaped like A method for manufacturing a fiber-reinforced plastic eyeglass frame part, which is characterized by molding it into a desired eyeglass part shape;
is provided.

More specifically, carbon fibers, glass fibers, synthetic resin fibers (for example, nylon fibers), and other inorganic and organic fibers are used as the reinforcing fibers 4 of the eyeglass frames of the present invention. In this case, the reinforcing fibers 4 selected from these are preferably long fibers, which are aggregated 4, 4, . . . into rims 1. Bridge 2. It is arranged in a compressed state along the shape line of frame parts such as the temple 3.

In addition, in a general eyeglass frame, the left and right rims 1 and 1 are connected by a bridge 2, but when the eyeglass frame of the present invention adopts such a general form, the rim 1 and the bridge 2 are connected. As shown in Fig. 2, it is necessary to intertwine the reinforcing fibers 4, 4, etc. of both parts 2 in a stacked manner at the joint site, and this structure may also be applied to other parts joint sites. . In the present invention, the synthetic resin used to shape the reinforcing fiber groups 4 arranged as described above into the shape of an eyeglass frame is appropriately selected from conventionally known thermosetting resins or thermoplastic resins. Ru.

Hereinafter, the operation and effect of the present invention will be explained using Examples along with the manufacturing method of the parts constituting the eyeglass frame of the present invention.

〔Example〕

Carbon fiber (Toshiki: trade name: Trading Card T 3006000-50A) is used as the reinforcing fiber, and bisphenol A type epoxy resin (Shell Chemical Co., Ltd.: product number #1001. #82B) and 4,4''-diaminodiphenylmethane are used. Hardening agent (Mitsui Toatsu Kagakuken: MDA
-220) to obtain a roving prepreg.

In addition, these compounding ratios and coating conditions are as follows.

Blending ratio: Synthetic resin #1001 100 parts by weight #828 100 Curing agent MDA-22040'' Acetone 200 Coating conditions: Resin impregnation rate 40-70% Drying temperature 90°C Drying time 10 minutes Prepreg was used for each frame part in the following manner.

Rim 1 part 17cm 10 pieces Upper bridge 2 part 10cm 4 pieces 6cm 6 pieces Lower bridge 21 piece 1.5 (2) 6 pieces The mold filled with the prepreg was loaded into a compression molding machine, and the temperature was 180°C and the pressure was 50kg. /cIa for 10 minutes, then cooled and molded frame parts (Freon (frame) in which the bridge and left and right rims are integrated) were taken out, and the surface was polished to remove burrs. : 1.2B) A thin line eyeglass frame with a beautiful shape was obtained.

Therefore, when we tested the tensile strength of the joint between the rim 1 and the upper bridge 2 in this frame part, we obtained the following results.

Test method: Based on JIS K 7113.

Tensile strength: 200 kg/n' Next, three bending strength and bending modulus tests were conducted, and the following results were obtained.

Bending strength test method: Based on JIS K 7203.

Bending strength 10-14kg/n2 Bending elasticity test: Conforms to JIS K 7203.

Flexural modulus 200-300 kg/vava'
As is clear from the above embodiments, according to the present invention, plastic eyeglass frames can be made of FRP in an ideal manner, and a plastic that satisfies the trade-off demands of weight reduction and strength improvement at the same time. Eyeglass frames can be mass-produced, and the benefits of mass production make it possible to provide fiber-reinforced plastic eyeglass frames at low prices, and to meet the demand for fashion-oriented eyeglass frames.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing the arrangement of reinforcing fibers in each part of the eyeglass frame of the present invention in a selectively enlarged manner;
The figure is an exploded explanatory diagram showing the stacked entanglement of reinforcing fibers at the joint between the rim and the bridge in the eyeglass frame of the present invention, and Figure 3 is a front view of the frame parts (front part) of the eyeglass frame of the present invention. It is. l...rim, 2...bridge, 3...temple. 4... Reinforcing fiber. Patent applicant Hihiko Horikawa Seisakusho Patent attorney Koji Togawa O

Claims (1)

[Claims] ■ Frame parts such as rims, bridges, and temples have a group of reinforcing fibers arranged in a compressed state along their shape lines, and at least at the joint between the rim and the bridge, the reinforcing fibers are compressed in both parts. A fiber-reinforced plastic eyeglass frame characterized by being formed by shaping a synthetic resin in a state in which the fibers contained therein are entwined in a stacked manner. (2) The #IA fiber-reinforced plastic eyeglass frame according to claim (2), wherein the reinforcing fiber group is composed of carbon fiber. (1) The fiber-reinforced plastic eyeglass frame according to claim (2), wherein the reinforcing fiber group is glass fiber. ■ A fiber-reinforced plastic eyeglass frame as described in item ■, in which the reinforcing fiber group is synthetic resin fiber. ■ The synthetic resin forming the reinforcing fiber group into a predetermined shape is thermosetting, &ll according to any one of claims ■ to ■.
plastic eyeglass frames. ■ #Jj according to any one of claims ■ to ■, wherein the synthetic resin forming the reinforcing fiber group into a predetermined shape is thermoplastic.
4 fiber reinforced plastic eyeglass frames. (2) The fiber-reinforced plastic eyeglass frame according to any one of claims (1) to (2), wherein the reinforcing fiber group is a collection of long fibers. ■ After arranging a large number of reinforcing fibers impregnated with a synthetic resin in a semi-hardened state in a mold cavity having a rim shape, bridge shape, or temple shape along the cavity shape line. A method for producing fiber-reinforced plastic eyeglass frame parts, which comprises parting the mold and molding it into a desired eyelid part shape using a hot press method. (2) A method for manufacturing a &lI fiber-reinforced plastic lens frame mirror frame according to claim (2), in which carbon fiber is used as the reinforcing fiber. @1 A method for manufacturing a fiber-reinforced plastic eyeglass frame component according to claim 2, wherein glass fiber is used as the reinforcing fiber. (2) A method for manufacturing fiber-reinforced plastic eyeglass frame parts according to claim (2), wherein a synthetic resin fiber is used as the reinforcing fiber. @ The method for producing m-fiber-reinforced plastic eyeglass frame parts according to any one of claims (1) to (2), in which long fibers are used as the reinforcing fibers. 0 Claim in which a mold is used whose cavity integrally has at least a rim shape and a bridge shape
The method for manufacturing a fiber-reinforced plastic eyeglass frame component according to any one of ~@.