Norbond blocking pads are designed with unique foam core and adhesive technologies to guarantee high reliability in the edging process of eyeglass ophthalmic lenses. The edging process, or final shaping of an ophthalmic lens, requires a high performance product with consistent quality for reproducibility in manufacturing. Norbond blocking pads are the only component to secure the lens in place during the abrasive edging process, and the performance of the pad is crucial to enable prescription fulfillment. Choosing the right edging pad can enhance productivity and decrease waste, especially for advanced anti-reflective and super-hydrophobic coatings.
Saint-Gobain provides a variety of edging pad solutions for a wide range of lens materials, machinery and coatings.
Norbond OP6400 is a high shear acrylic adhesive tape manufactured with high density foam. The product has been designed specifically for lens grinding/blocking applications which use a wide range of different equipment types. The foam is a high quality Polyolefin with excellent dimensional tolerances and excellent key to the adhesive surface. The thickness and density range has been chosen to offer high internal strength and resistance to elongation and rotational forces. The foam allows the adhesive pad to conform to the contours of the lens materials to give a secure bond during the grinding process and will aid the removal of the pad from the lens after use.
Norbond OP5C blocking pads combine a modified acrylic adhesive and unique internal reinforcement technology for a wide-range of lens coatings, materials and curvatures. The pad protects the lens from slipping due to high rotational forces, minimizing waste during the final edging process. The soft foam surface of Norbond blocking pads provides good adhesive wet-out and maximum conformability.
Norbond OP45 blocking pads are specifically engineered for the latest generation anti-reflective and super-hydrophobic coatings. This superior blocking pad combines a microcellular polyurethane foam core and high performance adhesive for optimal torque resistance, eliminating the need for supplementary film and reducing total systems costs. Saint-Gobain’s Norbond OP45 blocking pads combine two adhesives – one optimized for the lens and the other for block – for adhesion. For error-free application, the lens surface of the pad is identified with “SecurEdge® Plus” printed under the adhesive
Norbond OP7 blocking pads combine strong acrylic adhesive and polyurethane foam for a superior hold. The pad is engineered to provide a good quick stick and resist rotational forces during edging, minimizing waste. An economic yet reliable blocking pad for general use, the OP7 Series removes cleanly with no adhesive residue or marring.