Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
  • C03C15/02—Surface treatment of glass, not in the form of fibres or filaments, by etching for making a smooth surface
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
  • C03C15/02—Surface treatment of glass, not in the form of fibres or filaments, by etching for making a smooth surface
  • C03C15/025—Surface treatment of glass, not in the form of fibres or filaments, by etching for making a smooth surface for polishing crystal glass, i.e. lead glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
  • C03C23/0075—Cleaning of glass
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
  • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
  • G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
  • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter

Definitions

• the present invention shows a manufacturing process of glass sheets with diffuse finish and, more specifically, a manufacturing process to produce a diffuse glass by immersion in acid solutions by modifying their optical properties and giving it a diffuse finish.
• float glass has the protection of works of art and portraits, accompanied by a frame of wood or other materials.
• the primary purpose of covering the works of art with glass is its physical protection from factors such as humidity, heat and stains. Glass is also used because it grants good levels of UV protection which can attack the pigments of the works of art that are to be protected and cause eventual discoloration.
• a common problem that arises when using flat glass as protection of works of art is that when a viewer is faced with a piece framed with this material, the easiest thing is that, instead of a work of art, See your own reflection. In order to eliminate this effect caused by the reflection of light, attempts have been made to fight for several paths and the most widespread solution has been the use of diffuse flat glass. Now, the way in which diffuse flat glasses avoid reflections is the treatment of their surface with acids. This prevents glare by adding irregularities to the surface.
• this diffuse glass Regularly, in the manufacture of this diffuse glass, clear flat glass is used due to its high availability in the market and its low cost against other types of glass.
• the typical thickness of this glass ranges from 2.0 mm to 2.5 mm.
• Conventional clear glass with this thickness has a light transmission of about 90% and a reflection of 8%.
• the level of reflection drops around 1%.
• AR anti-reflective glass
• this type of glass is normally used for high-value applications such as monitor screens or glasses that are part of exhibitors.
• the most common configurations used in this type of products consist in the alternation of a high refractive index film (eg Ti0 2 ) with a low refractive index (eg Si0 2 ). Regularly the level of reflection reached depends on the number of films alternated with each other, where the lowest performing product has at least 4 films.
• acrylic which has a great light transmission and an optical quality similar to that of glass. It shows a great advantage against the glass from the point of view of density, since acrylic is a very light material, but it shows the disadvantage of being easily rayable and retaining the static load. which is harmful for a certain type of art (cake and charcoal technique), which is why it has not been very successful for anti-reflective applications.
• the present application describes a batch-type industrial process to produce several sheets of flat glass with diffuse finish simultaneously, considerably reducing the reflection value of specular light which allows the product obtained to be applied as protection of photographs and works of art .
• a further objective of the present invention is to provide a manufacturing process of glass sheets with diffuse finish providing a reflection level of about 1%.
• Another objective of the present invention is to provide a manufacturing process of glass sheets with diffuse finish that provides an average roughness of 0.8020 ⁇ to 0.7081 ⁇ .
• Figure 1 shows a roughness image for the ATR glass, in 3 dimensions, side one.
• Figure 2 shows a roughness graph, in one dimension, for the ATR glass, side one.
• Figure 3 shows a roughness image for the ATR glass, in 3 dimensions, side two.
• Figure 4 shows a roughness graph, in one dimension, for the ATR glass, side two.
• Figure 5 shows a roughness image for the PAVIA glass, in 3 dimensions, side one.
• Figure 6 shows a roughness graph, in one dimension, for PAVIA glass, side one.
• Figure 7 shows a roughness image for the PAVIA glass, in 3 dimensions, side two.
• Figure 8 shows a roughness graph, in one dimension, for PAVIA glass, side two.
• flat glass packages are provided that will be processed in groups in groups, which are received in storage racks specially designed so that the glass does not suffer any type of damage either by scratches or breakage.
• the next step is to introduce at least one sheet of glass into a first acid solution.
• Said solution may be a 32.5% hydrochloric acid solution for a time of between 20 to 60 seconds, in order to remove all impurities that may be present in. flat glass sheets such as traces of separator dust, fingerprint marks, glove stains, etc.
• This process is carried out in a container that allows processing from 1 to 7 sheets of minimum dimensions of 1200 cm by 1800 cm and maximum dimensions of 1800 cm by 2600 cm with thicknesses from 2.0 mm to 19 mm which is equivalent to processing from 75.6 kg up to 1556.1 kg of glass.
• the glass sheet or sheets are subjected to a second immersion in a second acid solution composed of a mixture of 70% Ammonium Bifluoride and 30% Hydrochloric Acid at 32.5% for a time between 30 seconds and 300 seconds.
• a second acid solution composed of a mixture of 70% Ammonium Bifluoride and 30% Hydrochloric Acid at 32.5% for a time between 30 seconds and 300 seconds.
• the immersion of the sheets in this mixture generates a tinting of the glass sheets on both sides but also generates a crust on them, which must be removed.
• the glass sheet or sheets To achieve the removal of the scab, it is necessary to reintroduce the glass sheet or sheets into an alkaline solution, such as a 2% caustic soda solution.
• an alkaline solution such as a 2% caustic soda solution.
• the caustic soda solution is subjected to a stirring process by bubbling, for a period from 2 minutes to 5 minutes depending on the degree of removal of the scab.
• the next stage is to reintroduce one or more sheets. of glass in an acid solution.
• Said alkaline solution may be a 32.5% hydrochloric acid solution.
• the immersion time will be between 30 to 600 seconds. With this immersion it is possible to eliminate the opacity generated in the previous step, maintaining the roughness that originates on the surface of the glass, making the glass resume its transparency but with a low level of light reflection.
• the glass sheets are re-introduced into a tank containing a 2% caustic soda solution. This stage is intended to cut off the reaction of hydrofluoric acid with glass. Said glass sheets are kept in the tank for 20 seconds to 60 seconds as required.

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• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Optics & Photonics (AREA)
• General Physics & Mathematics (AREA)
• Manufacturing & Machinery (AREA)
• Crystallography & Structural Chemistry (AREA)
• Surface Treatment Of Glass (AREA)
• Laminated Bodies (AREA)

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Citations (2)

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• 2014
  • 2014-06-27 WO PCT/MX2014/000098 patent/WO2015199525A1/es not_active Ceased
  • 2014-06-27 BR BR112016030688-0A patent/BR112016030688B1/pt active IP Right Grant
  • 2014-06-27 MX MX2016017273A patent/MX2016017273A/es unknown
  • 2014-06-27 CA CA2953790A patent/CA2953790C/en active Active
  • 2014-06-27 CR CR20170028A patent/CR20170028A/es unknown
  • 2014-06-27 US US15/322,284 patent/US10358382B2/en active Active
• 2017
  • 2017-01-24 EC ECIEPI20174911A patent/ECSP17004911A/es unknown
• 2019
  • 2019-06-11 US US16/437,733 patent/US11261127B2/en active Active
• 2022
  • 2022-01-31 US US17/588,727 patent/US12391605B2/en active Active

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