Method for shaping sheet thermoplastic and the like
A thermoplastic material, a purpose-built technology, applied in glass molding, other household appliances, glass reshaping, etc., can solve problems that endanger the shape and surface quality of products
Inactive Publication Date: 2012-10-24
MASSACHUSETTS INST OF TECH
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Problems solved by technology
However, in all of these examples, the roughness of the coating and the aforementioned effects of particles and other surface contaminants can compromise the shape and surface quality of the final product
Method used
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[0027] A thermoplastic material forming method according to the present invention comprises forming a sheet of thermoplastic material by using a layer of fluid, such as air, sandwiched between the sheet and a pre-formed air bearing fixture. The thermoplastic material must be heated to a temperature close to its softening point. In the case of glass, this temperature may typically be in the range of 400°C to 800°C. The furnace is used to control the temperature of the sheet, air bearing fixture and forming air so that the forming process is performed at near thermal equilibrium.
[0028] figure 1A perspective view of a first embodiment is shown placing a sheet between two air bearings oriented in a vertical plane relative to gravity. figure 2 is a cross-sectional view of the same embodiment as described, without the slide bearing structure. The desired result is to increase the surface flatness of the glass or thermoplastic sheet 6 . A preferred sheet material is borosilic...
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Processes and apparati for shaping sheet glass or thermoplastic materials use force from a layer of a flowing fluid, such as air, between the sheet and a mandrel at close to the softening temperature of the thermoplastic. The shape is preserved by cooling. The shape of the air bearing mandrel and the pressure distribution of the sandwiched fluid contribute to the final shape. A process can be conducted on one or two surfaces such that the force from the air layer is on one or two surfaces of the sheet. A two-sided process improves sheet flatness if applied during a continuous manufacturing process, such as fusion or slot-draw. The gap size between the sheet and mandrel determines the pressure profile in the gap, which also determines the final sheet shape. In general, smaller gaps lead tolarger viscous forces imparted by the fluid. The pressure profile depends on the shape of the mandrel, the size of the fluid gap between the mandrel and the sheet and the fluid supply pressure.
Description
[0001] The relevant literature [0002] The benefit of US Provisional Application No. 60 / 808475 (Filing Date: May 25, 2006, Title of Invention: THERMAL SHAPING OF THIN GLASS SUBSTRATESUSING POROUS MEDIA), which is hereby incorporated by reference in its entirety, is hereby claimed. Background technique [0003] The present invention relates to the forming of sheets of glass and thermoplastic material using heat to soften the sheet and fluids or gases to shape it. As used herein, the term thermoplastic refers to any material whose viscosity changes as a function of temperature, including silicate glasses such as borosilicate glass and fused silica, and polymeric materials such as polymethylmethacrylate (PMMA). [0004] Glass flakes are used in a wide range of applications such as flat panel displays, hard disk drives, automotive windshields, decorative items and optics for x-ray telescopes. Different applications require different tolerances for the final shape of the flakes...
Claims
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IPC IPC(8): C03B19/00
CPCC03B23/0235C03B23/0355C03B23/0252B29K2033/12C03B29/08C03B35/16B29C51/10B29L2031/778B29C51/42C03B29/025B29C51/00B29C51/06C03B19/00
Inventor M·K·阿基利安M·L·沙滕伯格
Owner MASSACHUSETTS INST OF TECH