JP2015004152A - Monofilament and spectacles frame using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an irregular-shape cross section monofilament which has a shape allowing easy engagement by pushing into grooves.SOLUTION: A monofilament of a thermoplastic resin is composed of a first engagement part and a second engagement member capable of engagement with an other member and a connection part connected to the first engagement member and the second engagement member. In the cross section of the monofilament perpendicular to the fiber axis direction, with the direction along the connection part connecting the first engagement part and the second engagement part together as the connection direction and the direction perpendicular to the connection direction as the width direction, the length of the monofilament in the connection direction is 0.8-1.5 mm, and the minimum value of the connection part in the width direction is 0.1-0.3 mm and smaller than both the lengths of the first engagement part and the second engagement part in the width direction. Of the first engagement part and the second engagement part, one engagement part is connected to the connection part with a contour line of an angle to the connection direction of 90° or smaller, and the length of the other engagement part in the width direction is 0.3-1.0 mm. The cross section is thus irregular-shape.

Description

  The present invention relates to a monofilament having a modified cross section. More particularly, the present invention relates to a cushion monofilament having a shape that can be easily fitted to a half-rim eyeglass frame.

  Instead of a conventional structure in which the entire outer periphery of a spectacle lens is held by a rim, recently, half-rim spectacles are widely used as a form of spectacles for reducing the weight, expanding the field of view, and improving the design.

  Such half-rim spectacles are characterized in that they are composed of a cushion monofilament sandwiched between the lens and the rim and a band for holding the lens. In order to prevent damage to the lens, a monofilament for cushioning is used between the rim and the lens, and the lens is suspended and fixed with monofilament such as water thread from the lower side of the lens.

  As a cushion monofilament for this half-rim eyeglass, a method has been proposed in which a saddle-shaped cross-section monofilament with balls up and down is fitted into a concave groove provided on the rim side and fixed to a frame (for example, see Patent Document 1). Yes.

  However, in order to insert the cushion monofilament into the rim, it is necessary to insert it sequentially from one end of the concave groove of the rim bent into the shape of the lens. It was necessary.

JP-A-8-62543

  An object of the present invention is to provide a modified cross-section monofilament having a shape that can be easily fitted by simply being pushed into a groove.

In order to achieve the above object, a monofilament according to the present invention includes a first engagement portion and a second engagement portion formed so as to be engageable with other members, and a first engagement portion and a second engagement portion. A monofilament of a thermoplastic resin composed of a connecting portion connected to the first and second connecting portions connecting the first engaging portion and the second engaging portion in a cross section perpendicular to the fiber axis direction of the monofilament. When the direction is the connection direction and the direction perpendicular to the connection direction in the cross section is the width direction,
The connection direction length of the monofilament is 0.8 to 1.5 mm,
The minimum value of the width direction length of the connection portion is 0.1 to 0.3 mm, and is smaller than any of the width direction lengths of the first engagement portion and the second engagement portion,
Of the first engagement portion and the second engagement portion, one engagement portion has a modified cross section connected to the connection portion with a contour line forming an angle of 90 ° or less with the connection direction, and the other engagement portion. The length of the joint portion in the width direction is 0.3 to 1.0 mm.

  In the monofilament of the present invention, the thermoplastic resin is preferably at least one selected from the group consisting of a polyamide resin, a polyester resin, a polyolefin resin, and a fluororesin. Moreover, it is preferable that said other engaging part has a hollow part extended in the fiber-axis direction of the said monofilament.

In order to achieve the above object, an eyeglass frame according to the present invention is an eyeglass frame in which a monofilament of a thermoplastic resin is fitted in a groove, and the monofilament is formed to be engageable with a lens. A first engagement portion; a second engagement portion formed to be engageable with the spectacle frame; and a connection portion connected to the first engagement portion and the second engagement portion.
In the cross section perpendicular to the fiber axis direction of the monofilament, the direction along the connecting portion connecting the first engaging portion and the second engaging portion is the connecting direction, and the direction perpendicular to the connecting direction in the cross section is the width direction. When
The connection direction length of the monofilament is 0.8 to 1.5 mm,
The minimum value of the width direction length of the connection portion is 0.1 to 0.3 mm, and is smaller than any of the width direction lengths of the first engagement portion and the second engagement portion,
The second engagement portion has a modified cross section connected to the connection portion with a contour line forming an angle of 90 ° or less with the connection direction;
The length in the width direction of the first engaging portion is 0.3 to 1.0 mm.

  According to the present invention, it is possible to insert a cushion monofilament that allows easy assembly of the rim and the cushion monofilament because the monofilament monofilament can be inserted into the groove of the rim simply by pressing it from above. Further, an eyeglass frame that can be easily assembled can be provided by fitting the cushion monofilament.

It is a schematic front view of the general spectacles which have a half rim. It is a BB cross-sectional enlarged view of the spectacles of FIG. 1, (A) shows the spectacles manufactured using the irregular cross-section monofilament which concerns on one embodiment of this invention, (B) shows the conventional irregular cross-section monofilament. 1 shows glasses manufactured using. It is a schematic sectional drawing showing various monofilaments, (A)-(D) show the vertical cross-sectional shape of the irregular-shaped monofilament which concerns on various embodiments of this invention, (E) shows the vertical cross-sectional shape of the conventional irregular-shaped monofilament. Show.

Hereinafter, the monofilament of the present invention will be specifically described with reference to the drawings.
A modified cross-section monofilament according to an embodiment of the present invention is used in general glasses having a half rim shown in FIG. 1, 1 is a rim, 2 is a lens, and 3 is a monofilament (water thread) for holding the lens. Show. 2 is an enlarged cross-sectional view taken along the line B-B of the glasses of FIG. 1. FIG. 2A shows an example in which the modified cross-section monofilament 4 according to the embodiment of the present invention is used, and FIG. An example in the case of using a conventional modified cross-section monofilament 54 is shown.

  As shown in FIG. 2, one end of the irregular-shaped monofilament 4 is fitted into the concave groove 5 of the rim 1, and the rim 1 and the irregular-shaped monofilament 4 are integrated, and then the concave groove 6 is dug around the lens 2. Is fitted to the other end of the monofilament 4 and the lens 2 is held by a monofilament 3 called a water thread from the lower side of the lens.

  3A to 3D show an example of a vertical cross-sectional shape with respect to the length direction of the odd-shaped cross-sectional monofilaments 4, 14, 24, 34, and FIG. 3E shows a vertical cross-sectional shape of the conventional cushion monofilament 54. Represents.

  The odd-shaped cross-section monofilaments 4, 14, 24, and 34 are formed from a first engagement portion 41 located at both ends of the cross section, a second engagement portion 42, and a connection portion 43 located between the engagement portions 41 and 42 at both ends. The distance between both ends in the connecting direction is defined as the connecting direction is the direction of the straight line connecting the first engaging portion 41 and the second engaging portion 42 in the cross section, and the direction perpendicular to the connecting direction is the width direction. H, the distance between the minimum contour lines in the width direction of the connection portion 43, W1, the maximum value W2 of the distance between the contour lines in the width direction of the first engagement portion 41, the connection portion of the first engagement portion 41 at one end When the angle between the contour line on the side of 43 and the connecting direction is R1, and the angle between the contour line on the other second engaging portion 42 and the connecting direction is R2, each part satisfies the following conditions: is important.

  First, in the cross section of the irregularly shaped monofilaments 4, 14, 24, 34, the distance H between both ends in the connecting direction needs to be in the range of 0.8 to 1.5 mm, preferably 1.0 to 1.3 mm. If the distance H is less than 0.8 mm, the protruding portion from the rim 1 becomes smaller when the monofilament monofilament is set on the rim 1, and a sufficient cushioning effect cannot be obtained. Since the lens 2 is detached when a lateral force is applied to the lens 2, it is not preferable. Conversely, when the distance H between both ends in the connecting direction is larger than 1.5 mm, a sufficient cushioning effect is obtained. And the lens 2 can be prevented from coming off, but the cushion monofilament can be seen between the lens 2 and the rim 1 so No longer it has been adopted from the fact that Mau.

  Further, the distance W1 between the minimum contour lines in the width direction of the connecting portion 43 is 0.1 to 0.3 mm, preferably 0.15 to 0.25 mm, and is wider than any of the engaging portions 41 and 42. The distance W1 between the minimum contour lines in the direction needs to be small. If the distance W1 between the minimum contour lines in the width direction of the connecting portion 43 becomes smaller than 0.1 mm, the connection strength between the first engaging portion 41 and the second engaging portion 42 becomes low, and the lens 2 When the force in the direction is applied, the monofilament connection portion 43 may be cut, and the lens 2 may be detached. If the thickness is larger than 0.3 mm, the thin lens may not be supported.

  In the cross section of the irregular cross-section monofilaments 4, 14, 24, 34, at least the first engagement portion 41 at one end has a maximum distance W2 between the contours in the width direction of 0.3 to 1.0 mm, preferably 0.5. It is important that at least one end of the engaging portion 42 has a deformed cross section having an angle R2 formed by a connecting line 43 and a connecting direction of 90 ° or less. When the maximum value W2 of the distance between the contours in the width direction of the first engaging portion 41 is smaller than 0.3 mm, the lens with the existing groove 6 dug with the existing equipment has an excessively large gap with the groove, and a cushioning effect is obtained. If it exceeds 1.0 mm, it will not fit in the groove 6 and the cushion monofilament will be visible between the lens 2 and the rim 1, which may break the design of the glasses. When the angle R2 formed by the connecting line 43 and the contour line on the side of the connecting part 43 of the second engaging part 42, which is the other engaging part, is larger than 90 °, it is pushed into the concave groove 5 of the rim 1 from above and fitted. In this case, the catching portion disappears, so that the lens 2 can be easily detached from the rim 1 and it becomes difficult to assemble the lens 2, and the lens 2 may come off when a lateral force is applied to the lens 2. .

  Here, as for the shape of the first engaging portion 41, if the maximum value between the contour lines in the width direction is within an appropriate range, the contour line on the side of the connecting portion 43 such as a round cross section, pentagon, hexagon, rhombus, etc. In addition to the shape where the angle R1 formed by the connecting direction is 90 ° or more, as shown in FIG. 3C, the angle R1 formed by the connecting line 43 and the contour line on the connecting portion 43 side is 90, as shown in FIG. Shapes below ° can also be used. On the other hand, the width W3 of the second engaging portion 42 is not particularly limited as long as it can be fitted in the concave groove 3 of the rim 1, but is approximately 0.4 to approximately 4 to be adopted for thin and light glasses that have recently become popular. A range of 0.6 mm is preferred.

  Examples of the thermoplastic resin used for the irregular-shaped monofilament include polyester resins such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate, 6 nylon, 66 nylon, 610 nylon, 612 nylon, 6/66 nylon copolymer, 6 / 12 Polyamide resins such as nylon copolymer and nylon terpolymer, polyolefin resins such as polyethylene and polypropylene, polyvinylidene fluoride, ethylene / tetrafluoroethylene copolymer, tetrafluoroethylene / hexafluoro Examples thereof include fluorine resins such as propylene / vinylidene fluoride copolymer. These may be used alone or as a mixture. Among these, polyamide resins and fluororesins can be preferably used in that they are excellent in moderate elongation and elongation elastic recovery characteristics.

  In addition, other components of the thermoplastic resin include particles such as various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin, and zirconium acid, and crosslinked polymer particles. Conventionally known antioxidants, sequestering agents, ion exchangers, anti-coloring agents, light-proofing agents, inclusion compounds, various coloring agents, waxes, silicone oils, various surfactants, polyesters, polyolefins, Polystyrene or the like may be added.

  Further, as shown in FIG. 3D, the first engagement portion 41 of the monofilament 34 having a modified cross section is provided with a hollow portion 44 extending in the length direction of the monofilament, so that the concave groove 5 of the lens 2 can be easily fitted. Thus, the effect of improving the cushioning property can be exhibited.

  A special spinning method can be applied to the production of the irregular-shaped monofilament without requiring any special method. For example, using a mixed extruder such as an extruder or a melt spinning machine such as a pressure melter type, a thermoplastic resin is melt-extruded from a deformed cross-section spinneret capable of forming a desired cross-sectional shape, followed by cooling. In addition to the method of extruding to solidify, the method of producing by spinning and drawing the unstretched yarn that has been cooled and solidified by hot drawing and heat setting, and in the mold that can form the desired cross-sectional shape after melting the thermoplastic resin It can be produced by injection molding or the like that is filled in and taken out after cooling.

  Hereinafter, the modified cross-sectional monofilament of the present invention will be described based on examples. The present invention is not limited to the following examples as long as the gist thereof is not exceeded.

  Evaluation of the irregular cross-section monofilament in the examples was performed by the following method.

[Dimensions of each part of irregularly shaped monofilament]
Using a digital microscope VHX-500F manufactured by Keyence Corporation, an enlarged photograph of a cross section perpendicular to the fiber axis direction of the irregularly shaped monofilament was taken, and the dimensions of each part were measured using a measurement function.

[Mating workability]
The ease of work of fitting one end of the irregularly shaped monofilament into the concave groove 5 of the rim 1 was evaluated in the following two stages.
○: The rim 1 could be fitted into the concave groove 5 of the rim 1 simply by pressing the second engagement portion 42 of the monofilament monofilament from above, and it did not come off when the first engagement portion 41 was pulled.
X: It was not possible to fit into the concave groove 5 of the rim 1 simply by pressing the second engaging portion 42 of the monofilament monofilament, and it was necessary to sequentially insert from one end of the rim 1. Moreover, although it was able to be fitted into the concave groove 5 of the rim 1 simply by pressing the second engaging portion 42 of the monofilament with a modified cross section from above, it can be detached from the concave groove 5 only by lightly applying stress to the first engaging portion 41. I have.

[Lens retention]
When the half-rim glasses were assembled using the irregular cross-section monofilament as a cushion monofilament, the following two stages of evaluation were carried out.
○: Even if a lateral force was applied to the assembled half-rim glasses lens, the lens did not come off and there was no squeak noise, and it was neatly placed between the lens and the rim.
×: The lens was easily detached when a lateral force was applied to the assembled half-rim glasses lens. In addition, the creaking noise generated by rubbing the lens and the frame was large, and there was no effect as a cushion monofilament.

[Design]
The fit of the rim 1 and the lens 2 when the half-rim glasses assembled using the irregular-shaped monofilament as a cushion monofilament was viewed from the front was evaluated in the following two stages.
○: There was no gap between the rim and the lens, and it was neatly fitted.
X: The cushion monofilament protruded between the rim and the lens, and the appearance was deteriorated.

[Example 1]
A polyamide-based resin (Toray Nylon 6 resin: M1021) is spun through a modified cross-section spinneret that can obtain the cross-sectional shape shown in FIG. 3A by a generally known extrusion molding method, and then cooled and solidified in cooling water. Then, the cooled unstretched monofilament was wound on a bobbin to obtain a modified cross-section monofilament. The evaluation results of the obtained monofilament are shown in Table 1.

[Example 2]
A resin having the same cross section as that shown in FIG. 3B was filled with the same resin as in Example 1 by a generally known injection molding method to obtain a modified cross section monofilament. The evaluation results of the obtained monofilament are shown in Table 1.

[Example 3]
In general, a polyamide-based resin (Toray Nylon 6 resin: M1021) is spun through a deformed cross-section spinneret that has the cross-sectional shape shown in FIG. 3C by a spinning drawing method, and then cooled and solidified in cooling water and cooled. The unstretched monofilament was hot-drawn, heat-set, and wound on a bobbin to obtain a modified cross-section monofilament. The evaluation results of the obtained monofilament are shown in Table 1.

[Example 4]
A modified cross-section monofilament was obtained in the same manner as in Example 1 except that the base was changed to a modified cross-section base that could obtain the cross-sectional shape of FIG. The evaluation results of the obtained monofilament are shown in Table 1.

[Example 5]
A modified monofilament monofilament was obtained by the method described in Example 1 except that the type of thermoplastic resin constituting the monofilament was changed to a polyester resin (Toray Polyester resin: T301). The evaluation results of the obtained monofilament are shown in Table 1.

[Example 6]
A modified cross-section monofilament was obtained by the method described in Example 1 except that the type of the thermoplastic resin constituting the monofilament was changed to a polyolefin resin (polypropylene resin manufactured by Sun Allomer: PL500A). The evaluation results of the obtained monofilament are shown in Table 1.

[Example 7]
A modified monofilament monofilament was obtained by the method described in Example 1, except that the type of the thermoplastic resin constituting the monofilament was changed to a fluororesin (SOLVAY SPECIALTY POLYMERS: Solef 6012). The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 1]
A modified cross-section monofilament was obtained in the same manner as in Example 1 except that the base was changed to a modified cross-section base that gave the cross-sectional shape shown in FIG. The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 2]
A modified monofilament monofilament was obtained by the method described in Example 1 except that the amount of polymer extruded from the die was reduced so that the length H between both ends of the first and second engaging portions was shortened. The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 3]
A modified monofilament monofilament was obtained by the method described in Example 1, except that the amount of polymer extruded from the die was increased and the length H between both ends of the first and second engaging portions was changed. The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 4]
A monofilament having a modified cross-section was obtained by the method described in Example 1, except that a base whose design of the base was changed so as to narrow the width of the distance W1 between the contours of the monofilament-shaped monofilament connection portion was narrowed. The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 5]
A monofilament having a modified cross-section was obtained by the method described in Example 1, except that a base whose design of the base was changed so as to increase the width of the distance W1 between the contours of the monofilament-shaped monofilament was widened. The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 6]
A modified monofilament monofilament was obtained by the method described in Example 1, except that a die whose design was changed so as to narrow the width of the distance W2 between contours in the width direction of the first engaging portion of the modified monofilament monofilament was used. . The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 7]
A modified monofilament monofilament was obtained by the method described in Example 1, except that a die whose design was changed so that the width of the distance W2 between the contours in the width direction of the first engagement portion of the modified monofilament monofilament was widened was used. . The evaluation results of the obtained monofilament are shown in Table 1.

[Comparative Example 8]
Table 1 shows the evaluation results when the irregularly shaped monofilament of Example 1 was used upside down, that is, when the portion having an angle R2 with the contour line of 110 ° was used on the rim side.

  As can be seen from the results in Table 1, the half-rim glasses (Examples 1 to 7) using the modified cross-section monofilament of the present invention as a cushion monofilament are easier to assemble than glasses using the conventional cushion monofilament. It was highly practical.

  On the other hand, half-lens glasses (Comparative Examples 1 to 8) using a modified cross-section monofilament that does not satisfy the conditions of the present invention as a cushion monofilament have problems in either fitting workability, lens holding, or design. As a cushion monofilament, it was less practical.

  According to the present invention, when a deformed cross-section monofilament having a shape that can be easily fitted simply by being pushed into a groove is used as a cushion monofilament for half-rim glasses, the assembly of the rim and the cushion monofilament is facilitated, and the assembly workability is improved. As a result, the contribution to the glasses industry is extremely large.

1 rim 2 lens 3 monofilament (water thread)
4, 14, 24, 34, 54 Deformed cross-section monofilament 5 Rim concave groove 6 Lens concave groove 41 First engagement portion 42 Second engagement portion 43 Connection portion 44 Hollow portion H First and second engagement portions Distance between both ends W1 Minimum distance between contours of connecting portion W2 Distance between contours in width direction of first engaging portion W3 Distance between contours in width direction of second engaging portion R1 Contour line on first engaging portion side and connecting direction The angle between the contour line on the second engagement part side and the connection direction

Claims (4)

A thermoplastic resin composed of a first engagement portion and a second engagement portion formed so as to be engageable with other members, and a connection portion connected to the first engagement portion and the second engagement portion. A monofilament, wherein a direction along the connection portion connecting the first engagement portion and the second engagement portion in a cross section perpendicular to the fiber axis direction of the monofilament is a connection direction, and the cross section is perpendicular to the connection direction. When the direction is the width direction
The connection direction length of the monofilament is 0.8 to 1.5 mm,
The minimum value of the width direction length of the connection portion is 0.1 to 0.3 mm, and is smaller than any of the width direction lengths of the first engagement portion and the second engagement portion,
Of the first engagement portion and the second engagement portion, one engagement portion has a modified cross section connected to the connection portion with a contour line forming an angle of 90 ° or less with the connection direction, and the other engagement portion. The monofilament characterized in that the widthwise length of the joint is 0.3 to 1.0 mm.   The monofilament according to claim 1, wherein the thermoplastic resin is at least one selected from the group consisting of a polyamide resin, a polyester resin, a polyolefin resin, and a fluororesin.   The monofilament according to claim 1 or 2, wherein the other engaging portion has a hollow portion extending in a fiber axis direction of the monofilament. A glasses frame in which a monofilament of thermoplastic resin is fitted into a groove, wherein the monofilament is formed so as to be engageable with a lens, and a first engagement portion is formed to be engageable with the glasses frame. It is composed of two engaging parts and a connecting part connected to the first engaging part and the second engaging part,
In the cross section perpendicular to the fiber axis direction of the monofilament, the direction along the connecting portion connecting the first engaging portion and the second engaging portion is the connecting direction, and the direction perpendicular to the connecting direction in the cross section is the width direction. When
The connection direction length of the monofilament is 0.8 to 1.5 mm,
The minimum value of the width direction length of the connection portion is 0.1 to 0.3 mm, and is smaller than any of the width direction lengths of the first engagement portion and the second engagement portion,
The second engagement portion has a modified cross section connected to the connection portion with a contour line forming an angle of 90 ° or less with the connection direction;
The spectacle frame, wherein the length in the width direction of the first engaging portion is 0.3 to 1.0 mm.

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