EP1987917A1 - Plaquette de blocage ophtalmique - Google Patents

Plaquette de blocage ophtalmique Download PDF

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Publication number
EP1987917A1
EP1987917A1 EP07008965A EP07008965A EP1987917A1 EP 1987917 A1 EP1987917 A1 EP 1987917A1 EP 07008965 A EP07008965 A EP 07008965A EP 07008965 A EP07008965 A EP 07008965A EP 1987917 A1 EP1987917 A1 EP 1987917A1
Authority
EP
European Patent Office
Prior art keywords
ophthalmic
blocking pad
blocking
layer
adhesive
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07008965A
Other languages
German (de)
English (en)
Inventor
Todd W. Cole
Donald J. Therriault
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Performance Plastics Corp
Original Assignee
Saint Gobain Performance Plastics Corp
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
Application filed by Saint Gobain Performance Plastics Corp filed Critical Saint Gobain Performance Plastics Corp
Priority to EP07008965A priority Critical patent/EP1987917A1/fr
Publication of EP1987917A1 publication Critical patent/EP1987917A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/146—Accessories, e.g. lens mounting devices

Definitions

  • This disclosure in general, relates to ophthalmic blocking pads and methods for their use.
  • Optical lenses are useful in a variety of industries from astronomy to telecommunications to optometry.
  • a large international industry exists in preparing ophthalmic medical devices, such as glasses and spectacles. Fashion trends and a variety of medical conditions lead to a large variety of frames for glasses and spectacles, each requiring or utilizing a different shaped lens.
  • laboratories have turned to using a set of stock lens work pieces that can be shaped in accordance with the desired frame shape and ophthalmic prescription.
  • edgers and other shaping machines include a block or mount that secures a lens work piece during the edging or shaping process.
  • conformable substances such as low melting metal alloys and polymer compositions, have been used to conform to and secure a lens work piece in place.
  • shaping and edging equipment can include a set of blocks, each block of the set of blocks conforming to a particular curvature of an associated lens work piece.
  • adhesives and adhesive tapes have been used to secure the lens work piece to the block.
  • lens work pieces have shifted from traditional glass work pieces to polymeric work pieces, such as polycarbonate.
  • coating technologies that protect lenses from scratching, prevent glare and reflection, reduce fogging, and limit dirt buildup.
  • anti-reflection surfaces form low energy surfaces. Such low energy surfaces often are difficult to secure in a machine and, in particular, secure in a shaping or edging device that exerts large torque on the lens work piece.
  • an ophthalmic blocking pad includes a foam layer, a film layer disposed over and directly contacting the foam layer, and an adhesive layer disposed over the film layer.
  • the film layer has a tensile strength of at least about 25 ksi (172 MPa).
  • an ophthalmic blocking pad includes a foam layer having a specific gravity not greater than about 0.6, a rigid film layer in direct contact with the foam layer, and an adhesive layer configured to exhibit a peel adhesion of at least about 4.0 lb/in (0.70 N/mm) on polypropylene.
  • the rigid film layer has a tensile strength of at least about 25 ksi (172 MPa).
  • an ophthalmic blocking pad in another embodiment, includes a foam layer and an adhesive layer.
  • the ophthalmic blocking pad exhibits a Torque Performance of at least about 17.0 in-lb.
  • an ophthalmic blocking pad includes a foam layer and an adhesive layer.
  • the ophthalmic blocking pad exhibits a Peel Performance of at least about 1.5 N/cm.
  • a method of preparing an ophthalmic lens includes applying a first surface of a blocking pad to an ophthalmic lens work piece.
  • the blocking pad is configured to exhibit a Torque Performance of at least about 17.0 in-lb and a Peel Performance of at least about 1.5 N/cm.
  • the method further includes applying a second surface of the blocking pad to a machine block and shaping the ophthalmic lens work piece to form a shaped ophthalmic lens.
  • an ophthalmic blocking article in another embodiment, includes a first release liner forming a continuous sheet and a plurality of ophthalmic blocking structures disposed on the first release liner.
  • Each ophthalmic blocking structure of the plurality of blocking structures includes a first adhesive layer in contact with the first release liner, a foam layer disposed over the first adhesive layer, a second adhesive layer disposed over the foam layer, and a rigid film layer disposed between at least one of the first and second adhesive layers and the foam layer.
  • FIG. 1 and FIG. 2 include illustrations of an exemplary embodiment of a blocking system.
  • FIG. 3 and FIG. 4 include illustrations of exemplary embodiments of blocking pads.
  • FIG. 5 includes an illustration of an exemplary bandoleer including exemplary blocking pads.
  • FIG. 6 includes a flow diagram illustration of an exemplary method for preparing an ophthalmic device.
  • FIG. 7 includes a flow diagram illustration of an exemplary method for forming a blocking pad.
  • an ophthalmic blocking pad includes a foam layer, a film layer disposed over the foam layer, and an adhesive layer disposed over the film layer.
  • the film layer may have a tensile strength greater than that of the foam layer, such as a tensile strength of at least about 25 ksi (172 MPa).
  • the foam layer is a low density microcellular foam having a specific gravity not greater than 0.8.
  • the adhesive layer may include an adhesive configured to bond to a low surface energy material, such as a modified acrylic pressure sensitive adhesive.
  • the ophthalmic blocking pad also may include a second adhesive layer.
  • a method of preparing an ophthalmic device includes applying a first surface of a blocking pad to a lens work piece, applying a second surface of the blocking pad to a block, and shaping the lens work piece.
  • the blocking pad may have a Peel Performance of at least about 1.0 N/cm and a Torque Performance of at least about 17.0 in-lb.
  • a lens shaping system may include a blocking pad 102 and a block 106.
  • the blocking pad 102 includes a first adhesive surface 108 and a second adhesive surface 110 surrounding a foam layer 112.
  • the adhesive surface 108 is applied to a surface 114 of a lens work piece 104.
  • the adhesive surface 110 is applied to a surface 118 of the block 106. As a result, the lens 104 is adhered to the block 106, as illustrated at FIG. 2 .
  • the block 106 may include an engagement mechanism 116 for securing the block assembly within a shaping device. While a single blocking assembly is illustrated at FIG. 2 , more than one blocking assembly may be used to secure the lens work piece 104 to a shaping device. For example, a second blocking assembly may secure a second surface of the lens work piece 104.
  • the block 106 may include a conformable material, such a low melt metal alloy or polymer composition.
  • the block 106 may be a solid block having a rigid radius of curvature or shape.
  • the block 106 may include a flexible surface 118 that adjusts to the radius of curvature of the lens work piece 104.
  • the blocking pad 102 may include a single adhesive surface 108 and surface 118 may be configured to bond with a conformable material, such as a metal alloy or polymer composition.
  • the surface 110 may be configured to adhere with the block 106 through electrostatic or other forces.
  • FIG. 3 includes an illustration of an exemplary embodiment of a blocking pad 300.
  • the blocking pad 300 includes an adhesive layer 302 overlying a film layer 304.
  • the film layer 304 overlies and directly contacts a foam layer 306.
  • the film layer 304 is adhered directly to and directly contacts the foam layer 306 absent an intervening adhesive.
  • the adhesive layer 302 directly contacts the film layer 304.
  • the adhesive layer 302 forms a surface 308 configured to adhere to a lens work piece.
  • an optional release liner may overlie the adhesive layer 302 of the blocking pad 300 during transport and prior to use.
  • the adhesive layer 302 includes an adhesive configured to bond to a surface of an ophthalmic lens work piece.
  • the adhesive may be configured to bond to a low energy surface material, such as a specialized coating on a lens work piece.
  • the adhesive may be a pressure sensitive adhesive, such as a silicone rubber, synthetic rubber, acrylic adhesive, or any co-polymer, alloy or combination thereof.
  • the adhesive is a pressure sensitive synthetic rubber adhesive.
  • the adhesive is a modified acrylic adhesive, such as tackified modified acrylic adhesive.
  • the acrylic may be a pressure sensitive acrylic hybrid configured to bond to low surface energy surfaces.
  • the adhesive may be a silicone adhesive.
  • the adhesive of the adhesive layer 302 exhibits a desirable peel adhesion to polymeric surfaces.
  • the adhesive may exhibit a peel adhesion of at least about 4.0 lb/in (0.70 N/mm) on polypropylene.
  • the adhesive may exhibit a peel adhesion of at least about 5.0 lb/in (0.88 N/mm) on polypropylene, such as at least about 5.25 lb/in (0.92 N/mm) on polypropylene.
  • the adhesive may exhibit a peel adhesion of at least about 4.0 lb/in (0.70 N/mm) on high-density polyethylene.
  • the adhesive may exhibit a peeled adhesion of at least about 4.0 lb/in (0.70 N/mm) on each of polypropylene, high-density polyethylene, and low-density polyethylene.
  • the adhesive layer has a thickness in a range between about 0.1 mil (2.5 micron) and 5.0 mil (127 micron).
  • the thickness may be in a range between about 2.5 mil (63.5 micron) and 4.5 mil (114 micron), such as a range of about 3.0 mil (76.2 micron) to about 4.0 mil (102 micron).
  • the film layer 304 may include a polymeric material having a greater tensile strength and modulus than the foam layer 306.
  • the film layer 304 may include a polymeric sheet material, such as a polyester, polyaramide, polyolefin, polyamide, polycarbonate, polysulfone, polytetrafluoroethylene, polyurethane, poly vinyl acetate, poly vinyl alcohol, poly vinyl chloride, poly vinylidene chloride, poly vinylidene fluoride, copolymers or alloys thereof, or any combination thereof.
  • the film layer 304 is formed of a polyester film, such as PHanex TM IHC polyester film, available from Pilcher Hamilton Corporation.
  • the film layer 304 has a tensile strength of at least about 25 ksi (172 MPa), such as at least about 30 ksi (206 MPa).
  • the film layer may have an elongation-at-break not greater than about 150%, such as an elongation-at-break of not greater than about 110%, or even as low as 100%.
  • the film layer 304 may have a tensile modulus of at least about 400 ksi (2.76 GPa), such as at least about 500 ksi (3.44 GPa), or even at least about 550 ksi (3.76 GPa).
  • the film layer has a thickness in a range between about 0.1 mil (2.5 micron) and 5.0 mil (127 micron).
  • the thickness may be in a range between about 1.5 mil (38.1 micron) and 2.5 mil (63.5 micron), such as approximately 2.0 mil (51 micron).
  • the film layer 304 is in direct contact with a foam layer 306.
  • the foam layer 306 may be formed of a low density polymer foam, such as a micro-cellular foam.
  • the foam layer 306 may be formed of polyurethane, silicone, polyester, expandable polyolefin, polyether, diene elastomer, copolymers or alloys thereof, or any combination thereof.
  • the foam layer 306 is formed of a polyurethane foam.
  • the foam layer 306 may have a specific gravity not greater than about 0.8.
  • the foam layer may have a specific gravity not greater than about 0.7, or even, not greater than 0.6.
  • the foam layer 306 may have a density of about 25 lb/ft 3 (0.40 g/cc) to about 40 lb/ft 3 (0.64 g/cc), such as about 27 lb/ft 3 (0.43 g/cc) to about 35 lb/ft 3 (0.56 g/cc).
  • the foam layer 306 may exhibit a tensile strength less than that of the film layer 304.
  • the tensile strength of the foam layer 306 may be not greater than about 10 ksi (69 MPa), such as not greater than about 5 ksi (34 MPa), or even not greater than about 1 ksi (6.9 MPa).
  • the foam layer 306 may have an elongation-at-break greater than that of the film layer 304.
  • a foam layer 306 may have an elongation-at-break of at least about 200%, such as at least about 300%, or even, greater than about 400%.
  • the foam layer 306 may have a desirable 100% modulus of at least about 140 psi (965 kPa).
  • the foam layer 306 may exhibit a force-to-compression of about 10 psi (69 kPa) to about 20 psi (137 kPa), such as about 15 psi (103 kPa) to about 20 psi (137 kPa). Force-to-compression may be determined in accordance with ASTM D3574, Test C with a shear of 2%.
  • the foam layer 306 has a thickness in a range between about 20 mil (0.51 mm) and 40 mil (1.0 mm).
  • the thickness of the foam layer 306 may be between about 25 mil (0.64 mm) and 37 mil (0.94 mm).
  • a ratio of the foam layer 306 thickness to the film layer 304 thickness is in a range between about 5 and about 20, such as a range between about 8 and about 19.
  • the blocking pad 300 may include an additional adhesive layer, forming an adhesive surface opposite the surface of 308.
  • the additional adhesive layer may be located on an opposite side of the foam layer 306 from the adhesive layer 302.
  • an additional film layer may be disposed between the additional adhesive layer and the foam layer 306.
  • FIG. 4 includes a further embodiment of a blocking pad 400.
  • the blocking pad 400 includes a foam layer 406.
  • a film layer 404 may be in direct contact with and disposed over a major surface of the foam layer 406.
  • An adhesive layer 402 may be disposed over the film layer 404 and may be in direct contact with the film layer 404.
  • the blocking pad 400 may include an adhesive layer 408 disposed over a major surface of the foam layer 406 opposite the major surface over which the film layer 404 and adhesive layer 402 are disposed.
  • a film layer (not illustrated) may be disposed between the adhesive layer 408 and the foam layer 406.
  • the adhesive layer 408 may be in direct contact with the foam layer 406.
  • the adhesive layers 402 and 408 may be formed of similar adhesives. Alternatively, the adhesive layer 402 may be formed of a different adhesive from the adhesive layer 408. In a particular example, the adhesive layers 402 and 408 are pressure sensitive adhesives. Alternatively, the adhesive layer 402 may be a pressure sensitive adhesive and the adhesive layer 408 may be an adhesive activated by other methods, such as a thermally activated adhesive or a radiation activated adhesive, for example, a UV activated adhesive. In particular, the adhesive layer 402 includes an adhesive configured to bond with a low-surface energy material. The adhesive of adhesive layer 408 may be configured to bond with a blocking material, such as a metal or an elastomeric polymer.
  • a blocking material such as a metal or an elastomeric polymer.
  • the adhesive layer 402 may be configured to form an adhesive surface 410 configured to bond to a lens work piece.
  • the adhesive layer 408 may include an adhesive surface 412 configured to bond with a block or blocking material associated with a shaping device, such as an edging device.
  • the blocking pad 400 may include release liners 414 and 416.
  • the release liners 414 and 416 may be configured to protect the adhesive surfaces 410 and 412 during transport and prior to use.
  • the release liners 414 and 416 may be formed of very low surface energy films, polymer coated papers, oil-infused papers or fabrics, or other releasable materials.
  • the release liner 414 or 416 may be formed of a silicon oil-infused paper or fabric.
  • the release liner 414 or 416 may be formed of a silicone film.
  • a set of blocking pads may be formed as a bandoleer.
  • a release liner 502 may form a continuous sheet over which blocking pads 504 are situated.
  • a second release liner 506 may conform to the contour of the blocking pads 504.
  • the second release liner 506 may include a tab (not illustrated) to facilitated removal of the second release liner 506 from the blocking pad 504.
  • the blocking pad 504 may have a 3, 4 or 5 layer structure, as described above.
  • the blocking pad 504 includes at least one adhesive layer disposed over a film layer that is disposed over a foam layer.
  • the blocking pad 504 may include a second adhesive layer.
  • Each of the blocking pads 504 may be cut or shaped to a desired configuration such that when the blocking pad 504 is removed from the release liner 502 it is configured for use with a lens work piece.
  • the release liner 502 may be perforated and configured to tear to permit removal of a release liner 502 and at least one blocking pad 504 for use.
  • FIG. 6 includes an illustration of an exemplary method 600 for forming an ophthalmic device, such as a pair of glasses or spectacles.
  • the blocking pad may be applied to a machine block or machine component, as illustrated at 602.
  • the blocking pad may act to adhere a lens work piece to the machine block.
  • a machine block that includes a rigid surface or an elastomeric surface may be configured to receive a lens work piece.
  • the blocking pad may include a first adhesive surface configured to adhere to the material forming the machine block.
  • the blocking pad may be applied to a lens work piece, as illustrated at 604.
  • a second adhesive surface may be applied to a surface of a lens work piece.
  • the second adhesive surface may be configured to adhere to a low surface energy material, such as a coating on the lens work piece.
  • the assembly including the machine block, the blocking pad, and the lens is prepared, the assembly may be placed in a shaping machine to shape the contour of the lens to conform to the ophthalmic device, such as the frames of a set of glasses, in which the lens is to be placed, as illustrated at 606.
  • the lens may be removed or detached from the block by detaching the lens from the blocking pad, or detaching the blocking pad from the block, as illustrate at 608.
  • the blocking pad may be peeled from the lens, providing a shaped lens.
  • the shaped lens subsequently may be cleaned, as illustrated at 610, and inserted into frames, as illustrated at 612.
  • an ophthalmic device such as glasses or spectacles may be formed using the blocking pad.
  • the blocking pad may be formed by casting or laminating layers together.
  • the method 700 includes casting adhesive layers and foam layers over a film layer.
  • a foam layer may be cast over a film layer, such as a polyethylene terephthalate film layer, as illustrated at 702.
  • the foam layer may be a polyurethane foam.
  • an adhesive layer such as a modified acrylic adhesive layer, may be cast over an opposite surface of the film layer, as illustrated at 704.
  • an adhesive layer may be cast over the foam layer on a surface opposite from the film layer.
  • release liners may be applied to the surface of the adhesive layers, as illustrated at 706.
  • the foam layer may be formed over a film layer, such as through knife over roll direct casting.
  • the adhesive layer may be cast over a liner and partially cured.
  • the adhesive layer may be cast, such as through knife over roll direct casting, onto a preformed liner and heat-treated.
  • the adhesive is coated on a release liner and heated in one or more ovens having temperature zones (120°F, 140°F, 220°F, 225°F, 225°F) at 20 ft/min (0.10 m/s) with a total oven length of 75 feet (23 m).
  • the adhesive layer may be laminated to the foam layer or the film layer.
  • the blocking pad adheres to a lens or a lens work piece sufficiently to provide desirable properties, such as securing the lens work piece during an edging operation.
  • the blocking pad may be configured to provide a desired Peel Performance, Torque Performance, and Displacement Slope, as further defined below in the Example section. Peel Performance is the peel strength exhibited when the blocking pad is adhered to an anti-reflective lens, and is desirable within a range of about 0.95 N/cm to about 2.5 N/cm.
  • the ophthalmic blocking pad may exhibit a Peel Performance of at least about 1.0 N/cm, such as at least about 1.3 N/cm, or even at least about 1.5 N/cm.
  • Torque Performance is the maximum torque before failure of a blocking pad on an anti-reflective lens and is desirably high.
  • the blocking pad may provide a Torque Performance of at least about 17.0 in-lb.
  • the Torque Performance may be at least about 20 in-lb, such as at least about 22 in-lb.
  • Displacement Slope is the initial ratio of torque to deflection, and is desirably at least about 0.95, such as in a range of about 0.95 to about 1.2, such as about 1.0 to about 1.15. As used herein, Displacement Slope has units of in-lb/degree unless otherwise specified.
  • Each blocking pad includes adhesive layers on both external major surfaces and a foam core layer.
  • the foam core layer is a microcellular polyurethane foam having a specific gravity of approximately 0.48 to approximately 0.58.
  • the thickness of the foam core layer is approximately 25 mil (0.64 mm) to approximately 31 mil (0.78 mm).
  • the adhesive layers have a thickness of approximately 3 mil (76 micron) to approximately 4 mil (101 micron) and are formed of an acrylic pressure sensitive adhesive configured to bond to low surface energy surfaces.
  • the blocking pad may include a film layer having a thickness of approximately 2 mil (51 micron) to approximately 5 mil (127 micron).
  • the film layer is formed of a PHanex® IHC polyester film, available from Pilcher Hamilton Corporation. A sample is also formed that does not include the film layer.
  • the polyurethane foam layer is formed on the film by knife over roll direct cast.
  • the adhesive is partially cured, 5 minutes at room temperature, 5 minutes at 250°F, and 5 minutes at 300°F, and laminated to the film or foam layers.
  • Comparative testing of the blocking pads of Example 1 is performed to determine peel strength and torque values for standard and anti-reflective lenses.
  • Comparative samples include samples of OP7 and OP5C pad, available from D.A.C. Vision of Dallas, Texas, samples of Leap 2, Leap 3, 3M LSE, and 411DL, available from 3M, and samples of BluEdge.
  • the sample films performed comparably to other commercially available films when tested for peel strength on a standard lens. While the OP5C and 3M LSE films performed well, many of the samples and comparative samples exhibit a peel strength on standard lenses of between approximately 3 N/cm to approximately 4 N/cm. However, when the samples and comparative samples are tested for peel strength on anti-reflective lenses, Samples 1, 2, and 3 exhibit significantly greater peel strengths than many of the comparative samples.
  • Peel Performance is defined as the maximum continuous 90° peel strength for a pad tested on an Essilor Airwear Crizal Alize anti-reflective lens. With the exception of 3M LSE, each of the comparative samples exhibits a Peel Performance of less than 1.0 N/cm.
  • Torque Performance is defined as the maximum torque at failure for a blocking pad on an Essilor Airwear Crizal Alize anti-reflective lens. Torque Performance is determined using a Falex Torque Testing Machine configured to apply torque to the blocking pad at a rate of 1 rpm with a 3 lb load on the sample blocking pad. The blocking pad is bonded to the lens and allowed to sit for 1 minute. The failure of the pad typically occurs within 2 to 5 seconds. Displacement Slope is determined based on the initial ratio of torque to displacement using the method above.
  • the Samples 1, 2, and 3 exhibit a high Torque Performance (> 20 in-lb) relative to other commercially available blocking pads.
  • Sample 2 exhibits a Torque Performance at least about 10% greater than the Torque Performance of Samples 1 and 3.
  • performance of a sample can be characterized by Displacement Slope, defined as the initial ratio of torque to displacement when tested on an Essilor Airwear Crizal Alize Anti-reflective lens. As illustrated in Table 2, Samples 1, 2, and 3 exhibit a desirable Displacement Slope of approximately 1.0.
  • Foam properties are varied to study the influence of foam properties on ophthalmic blocking pad performance.
  • foam layer thickness, foam layer density, and foam composition/processing are varied. Changes in the foam composition and processing result in different foam density and force-to-compress.
  • the various foam densities are achieved with changes in Nitrogen gas flow rates during processing, effecting the density of the frothed foam polyurethane.
  • Force-to-compress is determined in accordance with ASTM D3574, Test C with a shear of 2%. Samples are compared to a low force-to-compress foam, V2800 polyurethane available from Saint-Gobain Performance Plastics Corporation.
  • TABLE 3 relates foam properties to Torque Performance. While each of the Samples 4-8 performed better than the comparative samples illustrated above, several ophthalmic blocking pad samples having a thickness of about 31 to about 39 exhibit Torque Performance of greater than about 20 in-lb. In another example, several samples having a foam layer density of about 27 lb/ft 3 (0.43 g/cc) to about 36 lb/ft 3 (0.58 g/cc), and in particular, samples having a foam layer density of about 34 lb/ft 3 (0.54 g/cc) to about 35 lb/ft 3 (0.56 g/cc) appear to exhibit a Torque Performance of at least about 21 in-lb.
  • Peel Performance, Torque Performance, and Displacement Slope are determined for samples having varying thickness of film and adhesive layers.
  • the samples are formed as described in Example 1 with the exception of the selection of different layer thicknesses.
  • samples including a film layer of at least 2 mil and an adhesive layer of at least about 3 mil (76 micron) exhibit high Torque Performance, Displacement Slope, and Peel Performance.
  • Samples including a film layer of approximately 2 mil (51 micron) and an adhesive layer of approximately 2-3 mil (51-76 micron) exhibit a desirable Displacement Slope of approximately 1.0, a desirable Peel Performance of approximately 1.0 N/cm, and a Torque Performance greater than 22.0 in-lb.
  • a blocking pad is formed including adhesive layers on both external major surfaces and a foam core layer.
  • the foam core layer is a microcellular polyurethane foam having a specific gravity of approximately 0.48 to approximately 0.58.
  • the thickness of the foam core layer is approximately 30 mil (0.76 mm).
  • the adhesive layer has a thickness of approximately 3 mil (76 micron) and is formed of a silicone adhesive configured to bond to low surface energy surfaces.
  • the blocking pad includes a film layer having a thickness of approximately 2 mil (51 micron).
  • the film layer is formed of a PHanex® IHC polyester film, available from Pilcher Hamilton Corporation.
  • the blocking pad having silicone adhesive surfaces exhibits a Torque Performance of 24 in-lb and a Displacement Slope of 0.83. As such, the blocking pad exhibits a desirable combination of Torque Performance and Displacement Slope.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesive Tapes (AREA)
EP07008965A 2007-05-03 2007-05-03 Plaquette de blocage ophtalmique Withdrawn EP1987917A1 (fr)

Priority Applications (1)

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EP07008965A EP1987917A1 (fr) 2007-05-03 2007-05-03 Plaquette de blocage ophtalmique

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EP07008965A EP1987917A1 (fr) 2007-05-03 2007-05-03 Plaquette de blocage ophtalmique

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EP1987917A1 true EP1987917A1 (fr) 2008-11-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2204259A3 (fr) * 2009-01-06 2017-06-21 Hoya Corporation Plaquette de lentille, procédé de fabrication de plaquette de lentille, procédé de fabrication de lentille, et élément adhésif
CN110682186A (zh) * 2018-11-14 2020-01-14 住华科技股份有限公司 冶具及应用其的磨削方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221083A (en) * 1978-01-03 1980-09-09 Valley Industrial Products Heat shield blocking and mounting disc for lens grinding
US4287013A (en) * 1979-05-08 1981-09-01 Minnesota Mining & Manufacturing Company Comformable, multilayered tape adherent on one surface to fusable metal alloys and on the other surface to ophthalmic lens blanks
WO1994002286A1 (fr) * 1992-07-17 1994-02-03 Minnesota Mining And Manufacturing Company Procede de traitement d'une lentille et systeme permettant de l'utiliser dans le procede
EP0615814A1 (fr) * 1993-02-12 1994-09-21 NATIONAL OPTRONICS, Inc. Dispositif de blocage pour lentilles
US6074290A (en) * 1994-10-28 2000-06-13 Minnesota Mining And Manufacturing Company Compliant lens block and tape
US20050042977A1 (en) * 2003-01-27 2005-02-24 Seiko Epson Corporation Adhesive tape and edging method using same
EP1803531A1 (fr) * 2004-10-15 2007-07-04 Musashi Chemicals Industry Co., Ltd. Ruban adhésif sensible à la pression pour fixation de lentille et procédé de traitement de lentille employant ledit ruban
EP2025461A1 (fr) * 2006-05-12 2009-02-18 Seiko Epson Corporation Feuille adhesive sensible a la pression et procede de bordage

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221083A (en) * 1978-01-03 1980-09-09 Valley Industrial Products Heat shield blocking and mounting disc for lens grinding
US4287013A (en) * 1979-05-08 1981-09-01 Minnesota Mining & Manufacturing Company Comformable, multilayered tape adherent on one surface to fusable metal alloys and on the other surface to ophthalmic lens blanks
WO1994002286A1 (fr) * 1992-07-17 1994-02-03 Minnesota Mining And Manufacturing Company Procede de traitement d'une lentille et systeme permettant de l'utiliser dans le procede
EP0615814A1 (fr) * 1993-02-12 1994-09-21 NATIONAL OPTRONICS, Inc. Dispositif de blocage pour lentilles
US6074290A (en) * 1994-10-28 2000-06-13 Minnesota Mining And Manufacturing Company Compliant lens block and tape
US20050042977A1 (en) * 2003-01-27 2005-02-24 Seiko Epson Corporation Adhesive tape and edging method using same
EP1803531A1 (fr) * 2004-10-15 2007-07-04 Musashi Chemicals Industry Co., Ltd. Ruban adhésif sensible à la pression pour fixation de lentille et procédé de traitement de lentille employant ledit ruban
EP2025461A1 (fr) * 2006-05-12 2009-02-18 Seiko Epson Corporation Feuille adhesive sensible a la pression et procede de bordage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2204259A3 (fr) * 2009-01-06 2017-06-21 Hoya Corporation Plaquette de lentille, procédé de fabrication de plaquette de lentille, procédé de fabrication de lentille, et élément adhésif
CN110682186A (zh) * 2018-11-14 2020-01-14 住华科技股份有限公司 冶具及应用其的磨削方法

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