WO1998017462A1 - Method for making the front part for spectacle frame - Google Patents

Method for making the front part for spectacle frame Download PDF

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Publication number
WO1998017462A1
WO1998017462A1 PCT/FR1997/001900 FR9701900W WO9817462A1 WO 1998017462 A1 WO1998017462 A1 WO 1998017462A1 FR 9701900 W FR9701900 W FR 9701900W WO 9817462 A1 WO9817462 A1 WO 9817462A1
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Prior art keywords
characterized
blank
method according
step
front part
Prior art date
Application number
PCT/FR1997/001900
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French (fr)
Inventor
Jacques Ardito
Original Assignee
Lunettes Grasset & Associes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR9613147A priority Critical patent/FR2754757B1/en
Priority to FR96/13147 priority
Application filed by Lunettes Grasset & Associes filed Critical Lunettes Grasset & Associes
Publication of WO1998017462A1 publication Critical patent/WO1998017462A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02CSPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C5/00Constructions of non-optical parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D12/00Producing frames
    • B29D12/02Spectacle frames

Abstract

The invention concerns a method for making the front part (1) for a spectacle frame (2) which consists in the following steps: a) producing by injection a blank in the form of a plate (16) made of a thermoplastic polymer material selected from the group consisting of polyolefins, polyacetals, polycarbonates, polyamides, saturated polyesters, sulphonic polymers, phenylene polysulphide; b) cutting out by milling the blank in the form of a plate (16) for obtaining the front part (1) for a spectacle frame (2). The resulting spectacle frames are particularly light and strong.

Description

METHOD OF MANUFACTURING A FRONT FOR

EYEGLASS FRAME

The present invention relates to a method of manufacturing a front part for an eyeglass frame.

Holders of prescription glasses or sun glasses or other protective demanding more and more quality mount with both aesthetic characteristics, strength and durability.

State of the art

Is known from EP-A-0515920 a front part for an eyeglass frame consists of cellulose acetate material. The manufacturing process employed consists in producing a blank made of cellulose acetate and then the cut to give it the desired shape of the front portion.

Also known are eyeglass frames polyamide material, intended in particular for sunglasses, produced by processes of injection into a mold whose impression has the form and the desired final dimensions of the frame.

US-A-4,690,523 discloses a front for a spectacle frame consisting of polyamide material. The front part comprises an additional member serving to strengthen it. The manufacturing process corresponding involves bonding two blanks polyamide, to be inserted between the two blanks the reinforcing element and then cutting the blank to the desired shape.

However, the front and spectacle frames made of cellulose acetate material exhibit mechanical properties and resistance to aging very mediocre. In addition, the front and spectacle frames made of polyamide material injected directly are not sufficiently resistant and either are intended for low-end products, or require the addition of a reinforcing element. This further complicates the manufacturing process.

Disclosure of the invention

The problem is to achieve a front for a spectacle frame which has mechanical and chemical resistance properties unmatched by a simple and inexpensive process.

The object of the invention is to overcome the lack of efficacy of existing polymer materials in the field of spectacle frames, by selecting new thermoplastic polymeric materials. The object of the invention is also to provide a manufacturing method suitable for the same thermoplastic polymeric materials selected.

According to the invention, a method of manufacturing a front part for an eyeglass frame is characterized in that it implements the following successive steps: a) production of a blank of a thermoplastic polymeric material selected from the group consisting of polyolefins, polyacetals, polycarbonates, polyamides, saturated polyesters, sulfonic polymers, poly phenylene sulfide; b) cutting of the blank for the front part for an eyeglass frame.

A draft is the starting point for the realization of the spectacle frame. The blank manufacturing step is done in particular by injection of polymeric material. It is asserted in this way a control of the material flow within a mold whose impression is shaped single blank. It also ensures a reduction of the orientations of the polymer and consequently, a reduction of the residual stresses trapped in the polymeric material constituting the blank. And, using the cutting of the blank to the desired final shape, is reduced internal voltage constraints. These usually appear in the front to frame made in the prior art direct injection.

Through the use of thermoplastic polymeric materials and the manufacturing process, the front part for this spectacle frame unparalleled performance characteristics enabling a fineness circles around the glasses, a condition for an extremely lightweight frame. This delicacy is possible thanks to the exceptional mechanical strength obtained.

The front part is resistant to plastic deformation, providing an ability to find the earlier forms after enforced deformation. This makes the unbreakable front, for example when inserting the lenses in circles, under normal conditions of use. This is not the case for the front parts manufactured from materials such as milled cellulose acetate and / or the injected polyamide, the latter being penalized by internal stresses generated during injection, voltages that generate internal cracks, hence the very high probability of breakage. The front section is proving resistant in time, its low sensitivity to moisture and the low probability of stress relaxation in contrast to injection technologies inducing deformations when it is warm.

The manufacturing process continues with the following steps: a polishing step and a cleaning step. Then the method continues with the steps that can be placed in any order: a decoration step, a step of curving and a step of forcibly pressing the hinges. Finally, the method ends with the following steps: a step of coating and a step of fixing the legs of the front part for an eyeglass frame.

Other advantages of the method for manufacturing a front portion according to the invention appear on reading the detailed description of the invention, with reference to the drawings given by way of illustration, wherein:

- Figure 1 shows a cutaway view of an injection mold;

- Figure 2 shows in perspective a plate-shaped blank; - Figure 3 shows from above a front part for an eyeglass frame; - Figure 4 shows in perspective an eyeglass frame comprising the front portion of Figure 3.

Detailed Description of the Invention

The term front portion 1 denotes the whole front face of the spectacle frame 2 comprising the two circles 3, 4 for holding the lenses, a bridge 6 between the two circles 3, 4, two seats 7, 8 provided to maintain with pivoting hinges 21, 22 of the two arms 9, 11 and is two local thickened portions of circles, two slots 13, 14 provided for the fixing lugs, facing each other and intended to bear on the flanks of the wearer's nose . All variations of shapes and dimensions are possible for circles 3, 4, the bridge 6, the seats for hinges 7, 8, and local thickenings circles.

Qualitative characteristics for the selection of the polymers are in particular a high yield strength and a high tensile strength and impact resistance. To select thermoplastic polymer materials, three main criteria were used:

- the density measured according to ISO 1183, so that the mount front part is not too heavy on the wings of the spectacle wearer's nose; - the tensile modulus measured according to ISO 527; and

- suitability for cutting and in particular to milling in order to achieve very fine forms of circles; during cutting, the polymeric material of the blank must not flake, or melt; at the end of cutting, the front part should not present melted or burned areas. Two more accessories criteria are those of transparency of the polymer material and the price.

Therefore, the choice was made in the groups of polymers charged or uncharged following:

- polyolefins and more particularly to high molecular weight polyethylenes (UHMWPE) and polypropylenes high crystallinity synthesized with metallocene type catalysts; or - polyacetals and more particularly of polyoxymethylene (POM) homopolymer and copolymers; or

- polyamides, more particularly polyamide 12 (PA12), and among these in particular polyamide 12 aliphatic and cycloaliphatic base; or - saturated polyesters and more particularly ethyl terephthalates

(PET) and polybutylene terephthalate (PBTP); or

- polycarbonate (PC); or

- sulfonic polymers and more particularly polysulfones (PSU), polyethersulfone (PESU) and polyphenyl sulphones (PPSU); or - polyphenylene sulfide (PPS).

The method of manufacturing spectacle frames 2 made of polymer materials, using a first material not yet used in this application is carried out according to the successive steps described below. From thermoplastic polymer pellets commercially available, is added, if desired, adjuvants such as colored pigments and / or antioxidants and / or light stabilizers called UV. It is also possible to add reinforcing fibers or mineral fillers.

The method begins by a step of producing a blank. Is manufactured by injection-molding a preform technologies regular shapes, elongated, for example substantially parallelepiped whose three dimensions length, width, thickness are slightly greater than those of the front part for the final telescope mount that s 'is manufactured.

The injection takes place in a mold for preform 17 through a suitable injection water, in order to balance and distribute very uniformly masses and polymer flow material flowing melt. The injection line corresponds to the place where the filling of the impression material will perform. The position of the injection line is located on one of the transverse sides of the mold to elongate blank. The geometry of the injection web is also specific. The molding conditions used with the above-mentioned mold are adapted to the polymeric materials used, and in particular to their melting point. We have optimized these conditions in order to obtain low directions of the molded material. The orientation rate is controlled by a measure withdrawing a sample. The quality of a preform made of transparent polymer material can be determined by visualization under stress with polarized light. In another alternative embodiment, the blank is produced by sintering the polymer powder in a mold under pressure and controlled temperature.

The blank is subjected to a cutting step. This blank is machined into its final form front goggle mount, with milling techniques on CNC machines. milling is programmed according to one or more axes for a front portion of spectacles whose model with its shape and all its dimensions is required by the customer.

specific cutting tools are used for cutting each of the polymeric materials. The implementation of conditions have been specifically developed to enable a satisfactory surface state. It adjusts the cutting angle of the cutting tools. The selected angle may for example be positive and its value varies depending on the polymeric material. In the prior art, for milling of polymeric materials conventionally used for such manufacturing such cellulose acetate, the angle is negative. the speeds are adapted to the cutting tool.

It also adjusts the feed rates of the blank. a cutting zone cooling system is used to avoid any problems of overheating of the polymeric material, due to the heat generated during the cutting operation.

under aqueous liquid can also be machined in soluble oil base. Finally, the attack of the blank by the cutter locations are different. The attack can be done from the outside. Against by, for cellulose acetate, the attack is carried out by drilling at the future location of the nose.

The chips of the polymer material used, for example polyamide 12, from the blank is retained for, in a related process for recycling agglomerates then remelted and reinstated in a specific proportion to the granules of virgin polymeric material during injection of roughing. Other computer-controlled cutting technologies can be considered: a jet of water under very high pressure or laser. The front for a spectacle frame obtained after cutting is then passed through a grinding phase. The conditions of operation are completely different from those known in the art. The technique used is that of abrasive washing in high-speed centrifuge, in aqueous medium and in the presence of an abrasive agent in the form of solid particles, e.g., cones and resin soap.

The centrifuge speeds are optimized and the temperature is controlled by cooling. The sanding is enough time greatly reduced, compared with the time when it comes to sanding traditional materials, such as cellulose acetate. Cellulose acetate sanded by methods in rotary barrels with pumice and abrasive fillers in a dry environment.

The cleaning step of the front portion for spectacle frame is also faster, since there is no residual grinding agent remaining adhered to the milling interstices and on the inside of the circles of the front portion .

Then the method continues with the following three steps, can be placed in any order: a decoration step of the front part for an eyeglass frame, a portion of said curling step forward and a hinge recess step in the provided spaces. A preferred order is: decoration, arching and pushing. It can also have as well: depression, decoration and arching. You can still place arching step ahead of these three steps.

The front part for spectacle frame is decorated. The decoration is effected by dye spraying or by contact with a sponge or an electrostatic painting or as the sublimation technique or dye addition in the mass of polymer material. For decoration by sublimation transferring a decoration from an aluminum substrate or a printed paper with inks which can be sublimated. the decoration film and the continued heating is applied to the part of the frame or on the field to be decorated. The film carrier is heated, not the receiver element that is the front for a horse, unlike the state of the art. The front part for spectacle frame is then bent and shaped in its final form depending on the desired model. In this step of curling, is adapted to the selected heating conditions material, maintaining the temperature and holding time on shaped conformers treadmill.

Then one proceeds to a stage of depression hinges. Milling above the inlay metal inserts forming hinges with optimized temperatures depending on the polymer material.

The front part for spectacle frame is subjected to a varnishing step. The shiny glasses is obtained by simple coating using varnish bi current components. A beautiful shiny finds despite matt polishing output. The manufacturing process allows to achieve a adaptability scenery, and a high quality of scenery by their precision, smoothness, color. The production management is compatible with fashion imperatives and small series.

Embodiments

For manufacturing a front portion 1 to an eyeglass frame 2 is used in a first example, polyamide 12 (PA12) aliphatic and cycloaliphatic basis of the EMS sold under the name Grilamid TR 90. Its glass transition temperature is 155 ° C, and its melt index measured according to ISO 1133 under 5 N at 275 ° C for 10 min. flow is 21 cm with the unmodified material. The PA12 is transparent and resistant to scratches.

From these pellets PA12, injection is produced a shaped blank plate 16 whose dimensions are 160 mm long, 60 mm wide and 6 mm thick. Injection is performed with an injection molding machine reference

90 trillion Visumat 5015, into a mold at two cavities arranged in opposition, with a central injection web.

The position of the injection line from the smallest side 18 of the rectangle constituting the plate 16. The injection is thus longitudinally relative to the mold 17 of the plate 16 (arrow 19). The geometry of the injected spray is specific. Its cross section has a shape with double slope identical to a roof, its longitudinal section, varies in thickness, the thickest part being on the side of the room to be injected, the thinner the side of the feed point of the pot 'injection. The molding conditions used with the mold 17 supra are: - injection temperature of 285 ° C ± 5 ° C and the injection time of 5 seconds,

- holding pressure of 400 bar and holding time of 20 s,

- cooling time 28 s and mold temperature of 50 ° C + 1 ° C. The orientation rate is controlled by a measure withdrawing a sample maintained in an oven at a temperature of 70 ° C for 24 h. The resulting 16 PA12 plate is then cut in its final form before part 1. This plate 16 is machined by milling in 3 axes on a reference numerical control Raian 3 of the company 2000. outas tooling used carbide cutting.

cutting angle of the tool is positive and is equal to + 2 °. The cutting speeds of 20,000 revolutions / minute. half reduces the feed speed of the plate in relation to those used for machining cellulose acetate plates. Cooling the cutting zone, the plate 16 and the tool, by air at -26 ° C. Finally, the attack of the plate 16 by the cutter is from the outside.

The front part 1 for a spectacle frame 2 obtained after milling is then sanded. The abrasive scrubbing is done by centrifuge whose rotational speed is optimized at 900 revolutions / minute. The temperature was maintained at an ambient temperature. The grinding time is 2 hours. The front part 1 is cleaned.

Table 1 shows a comparison of mechanical and thermal properties of front parts. part is obtained before 1 PA12 whose average thickness circle is 1.6 mm, which explains the very low weight.

Figure imgf000012_0001

Table 2 shows a comparison of the front mechanical and thermal properties arties.

Figure imgf000012_0002
Table 1 and Table 2 show the clear advantages of the polyamide material of the group 12 (PA12) selected and implemented according to the manufacturing method of the invention, compared to other materials used in making eyeglasses, it is - ie machined or metal acetates and propionates or injected polyamide, and relative to front part of manufacturing process, that is to say machining acetate or polyamide injection.

The front part 1 for a spectacle frame 2 is then bent on conformers at a temperature between 180 and 210 ° C, preferably at 200 ° C. then sets the two hinges 21, 22 respectively to the two seats 7, 8 provided.

We chose to decorate the front part 1 of PA12 as the sublimation technique, for transferring the decoration from an aluminum foil printed with the inks commercially available, particularly in SIC Mazzuchelli. Applying the decoration film and the maintenance by a silicone pad on the front part. The temperatures of the heated film support for such a transfer is carried out are set between 180 and 220 ° C. The holding time is at most 10 min., Preferably between 2 and 4 min. The pressure is approximately 4 bar.

The front part 1 for a spectacle frame 2 is then varnished.

In other embodiments according to the invention, the following polymers were tested by the method described and also give good results both aesthetically and in terms mechanical and thermal properties:

- polyacetals, polyoxymethylene homopolymer Delrin trade name of Du Pont de Nemours;

- polyamides, polyamide 6-6 in Allied, polyamide 11 Rilsan trademark of Atochem, polyamide 12 Orgamide trademark of Atochem, polyamide 12 Vestamid trademark of Hüls society, polyamide 12 trade name Grilamid TR 55 of the EMS; - saturated polyesters, Hostadur trade designation ethyl terephthalate from Hoechst;

- Polycarbonate Lexan trade name of General Electric, Makrolon trademark from Bayer; - sulfonic polymers, Udel polysulfone trade name of Union Carbide, the polyethersulfone ICI, the polyphenylsulfone Radel trade name of Union Carbide;

- Ryton polyphenylene sulfide trademark of Phillips Petroleum Company.

The method of the invention, the front part for an eyeglass frame and the eyeglass frame according to the invention are not limited by the details of the embodiments and examples chosen to illustrate it. Changes may be made without departing from the scope of the invention. The latter therefore encompasses all the means constituting technical equivalents of the means described and their combination.

Claims

1. A method of manufacturing a front part (1) to an eyeglass frame (2), characterized in that it implements the following successive steps: a) production of a blank (16) of a material thermoplastic polymer selected from the group consisting of polyolefines, polyacetals, polycarbonates, polyamides, saturated polyesters, sulfonic polymers, polyphenylene sulfide; b) cutting the blank (16) for the front part (1) to an eyeglass frame (2).
2. Method according to claim 1, characterized in that among the polyolefins, the particular used polyethylenes of high molecular weight polypropylenes called UHMWPE or high crystallinity synthesized with metallocene type catalysts.
3. A method according to claim 1, characterized in that among the polyacetals, one uses in particular homopolymers and polyoxymethylene copolymers.
4. A method according to claim 1, characterized in that from saturated polyesters, in particular are used ethyl terephthalates and polybutylene terephthalate.
5. A method according to claim 1, characterized in that from sulfonic polymers, in particular are used polysulfones, polyether and polyphenyl sulphones.
6. A method according to claim 1, characterized in that from polyamides, especially polyamides are used 12.
7. A method according to claim 6, characterized in that from polyamides 12, are used polyamides 12 aliphatic and cycloaliphatic basis.
8. The method of claim 6 or 7, characterized in that one uses polyamide 12 having a glass transition temperature of 155 ° C and having a melt flow index measured according to ISO 1133 under 5 N at 275 ° C for 10 min. flow of 21 cm 3.
9. Method according to one of the preceding claims, characterized in that the blank (16) is in the form of a substantially rectangular plate having substantially the front portion of the dimensions (1) to an eyeglass frame (2 ).
10. Method according to one of the preceding claims, characterized in that the step of providing the blank (16) is made by sintering of thermoplastic polymer material powder into a mold under pressure and controlled temperature.
11. A method according to one of claims 1 to 9, characterized in that the step of providing the blank (16) is made by injection of the thermoplastic polymer material into a mold (17).
12. The method of claim 11, characterized in that the injection is carried out in the longitudinal direction (19) relative to the mold (17) of the blank (16).
13. Method according to one of the preceding claims, characterized in that the step of cutting the blank (16) is made by machining and in particular by milling on a machine tool.
14. A method according to one of claims 1 to 12, characterized in that the step of cutting the blank (16) is effected by water jet under high pressure or by laser.
15. Method according to one of the preceding claims, characterized in that, for the front part (1) to an eyeglass frame (2), is carried out after the cutting step of the blank (16) , the following two successive steps, a polishing step and a cleaning step, in that subsequently performs the following three steps can be placed in any order, a step of curling, a step of forcibly pressing hinges ( 21, 22) and a decoration step, and in that it finally directs lacquering step.
16. The method of claim 15, characterized in that the decorating step is carried out by transfer of a decoration from a carrier film form having one or more inks which can be sublimated by heating the carrier under film form.
17. Method according to one of the preceding claims, characterized in that the recycled thermoplastic polymeric material rejected during cutting of the blank (16) by reincorporating the following a certain proportion in the same virgin thermoplastics polymeric material , designed for the production of the blank.
18. Eyeglass frame (1) characterized in that it comprises two branches (9, 11) and a front portion (1) obtained by the method according to one of the preceding claims.
PCT/FR1997/001900 1996-10-23 1997-10-23 Method for making the front part for spectacle frame WO1998017462A1 (en)

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FR96/13147 1996-10-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2158810A1 (en) * 1999-10-22 2001-09-01 Roman Fernando Jose Hinojosa Fabrication of bases for hooks made of polymers consists of application of adhesive alternating with polymer, giving a rectangular front of the hook
US20100236696A1 (en) * 2007-10-30 2010-09-23 Kim Joung-Soon Method of manufacturing glasses frame made of polyetherimide resin
JP2014002386A (en) * 2012-06-20 2014-01-09 Intermestic Inc Shape-adjustable spectacle frame

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
ES2157780B1 (en) * 1999-04-21 2002-03-16 Hinojosa Roman Fernando Jose Procedure to establish the basis for the manufacture of glasses parts installation for carrying out said method, and resulting base part.
ITBO20030283A1 (en) * 2003-05-08 2004-11-09 Type 20 S R L Sunglasses lightened structure and method of manufacturing the same.
FR2874710B1 (en) * 2004-08-31 2006-11-24 Christian Dalloz Sunoptics Sa Method for manufacturing a blank for carrying out a protective screen for sports glasses, blankets, protective screens and sports glasses obtained
FI120325B (en) * 2007-07-04 2009-09-15 Theta Optics Ltd Oy Method of making glasses
IT1397351B1 (en) * 2009-06-25 2013-01-10 Plastodidattica Commerciale S R L Method for the production of frames for eyeglasses and sunglasses in polyethylene terephthalate.
EP2946914A1 (en) * 2014-05-21 2015-11-25 Mount Bros LLC Method of manufacturing eyeglass frames, apparatus for carrying out the method and frames obtained with such method

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GB1108209A (en) * 1966-12-17 1968-04-03 Stewart Pactor Improved spectacle frame
US4690523A (en) * 1985-07-03 1987-09-01 Kenco Optics, Inc. Monolithic reinforced eyeglass frame and friction welding method for manufacturing same
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2158810A1 (en) * 1999-10-22 2001-09-01 Roman Fernando Jose Hinojosa Fabrication of bases for hooks made of polymers consists of application of adhesive alternating with polymer, giving a rectangular front of the hook
ES2161178A1 (en) * 1999-10-22 2001-11-16 Roman Fernando Jose Hinojosa Improved process to form the blanks for the manufacture of glasses
US20100236696A1 (en) * 2007-10-30 2010-09-23 Kim Joung-Soon Method of manufacturing glasses frame made of polyetherimide resin
JP2014002386A (en) * 2012-06-20 2014-01-09 Intermestic Inc Shape-adjustable spectacle frame

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FR2754757A1 (en) 1998-04-24

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