The invention relates to a method and a device for separating the excess glass (32) in the production of hollow glass products (12), wherein the method comprises: centring a hollow glass product (12) in a receiving device (10), which is designed to hold the hollow glass (12) and to rotate about a rotational axis in such a way that a separation line (24) along which the excess glass (32) is to be separated from the hollow glass product (12) to be produced is centred in relation to the rotational axis; processing the hollow glass product (12) in a plurality of positions along the separation line (24) by means of a laser beam in order to generate local filaments with a weakened glass structure during a rotation of the hollow glass product (12) about the rotational axis; and introducing energy along the separation line (24) in order to separate the excess glass (32) along the weakened glass structure.

A method for processing a transparent workpiece comprises forming an optically modified region in or on a transparent workpiece and forming a contour in the transparent workpiece, the contour comprising a plurality of defects in the transparent workpiece positioned laterally offset from the optically modified region. Forming the contour comprises directing a primary laser beam comprising a quasi-non diffracting beam oriented along a beam pathway onto the transparent workpiece such that a first caustic portion of the primary laser beam is directed into the transparent workpiece, thereby generating an induced absorption within the transparent workpiece to produce a defect within the transparent workpiece and a second caustic portion of the primary laser beam is modified by the optically modified region. Further, translating the transparent workpiece and the primary laser beam relative to each other along a contour line and laterally offset from the optically modified region.

A glass etching and breaking apparatus comprises a glass cutting tool and a flexible bridging element for inducing a score line into a pane of glass and aiding in breaking the pane of glass along the score line. The cutting tool is removable and storable within the body of the glass cutting apparatus. A magnet is provided for holding the cutting tool in place and for holding metal or magnetic objects. Methods of using the same are further provided.

A glass bottle cutter based on electric heating comprises a base. A rotary bracket and a heating and cutting seat are disposed at two ends of an upper surface of the base respectively A motor is disposed in the rotary bracket, and a rotating shaft of the motor is disposed outside the rotary bracket and is provided with a support plate. An adhesive pad allowing the bottom of a glass bottle to cling thereto is disposed on a surface of the support plate. A heating tube is disposed on an upper surface of the heating and cutting seat. The base is provided with a power access port and an internal circuit mainboard. The motor, the heating tube and the power access port are all electrically connected to the circuit mainboard.

A glass bottle cutter based on electric heating comprises a base. A rotary bracket and a heating and cutting seat are disposed at two ends of an upper surface of the base respectively A motor is disposed in the rotary bracket, and a rotating shaft of the motor is disposed outside the rotary bracket and is provided with a support plate. An adhesive pad allowing the bottom of a glass bottle to cling thereto is disposed on a surface of the support plate. A heating tube is disposed on an upper surface of the heating and cutting seat. The base is provided with a power access port and an internal circuit mainboard. The motor, the heating tube and the power access port are all electrically connected to the circuit mainboard.

A glass article (100) includes a core layer (102) formed from a core glass composition with a core coefficient of thermal expansion (CTE) and first (104) and second (106) cladding layers fused to first and second major surfaces of the core layer (102) and formed from a clad glass composition comprising a clad CTE. An aperture (120) extends through each of the core layer (102), the first cladding layer (104), and the second cladding layer (106). The clad CTE is less than the core CTE such that each of the first (104) and second (106) cladding layers is under a compressive stress and the core layer (102) is under a tensile stress. A flexural strength of the glass article (100) can be at least about 75 MPa. A peak load sustainable by the glass article (100) in a modified ring-on-ring test can be at most 96.5% less than a peak load sustainable by a reference glass article in the modified ring-on-ring test.

A glass article (100) includes a core layer (102) formed from a core glass composition with a core coefficient of thermal expansion (CTE) and first (104) and second (106) cladding layers fused to first and second major surfaces of the core layer (102) and formed from a clad glass composition comprising a clad CTE. An aperture (120) extends through each of the core layer (102), the first cladding layer (104), and the second cladding layer (106). The clad CTE is less than the core CTE such that each of the first (104) and second (106) cladding layers is under a compressive stress and the core layer (102) is under a tensile stress. A flexural strength of the glass article (100) can be at least about 75 MPa. A peak load sustainable by the glass article (100) in a modified ring-on-ring test can be at most 96.5% less than a peak load sustainable by a reference glass article in the modified ring-on-ring test.

A method determines an optimized cutting plan for using a guillotine to cut a batch of rectangular pieces of glass out from at least one sheet of glass. The method includes initializing including defining cutting constraints and positioning constraints for the pieces together with an optimization criterion; creating a tree comprising a root, leaves, each presenting a complete cutting plan enabling all of the pieces of the batch to be cut out, the cutting plan associated with a node of the tree being obtained by adding to the partial cutting plan associated with the parent node of the node, and in compliance with the constraints, the next piece for the frame determined in compliance with the sequence predetermined for the frame; and selecting a complete cutting plan associated with a leaf of the tree as a function of the optimization criterion.

A method determines an optimized cutting plan for using a guillotine to cut a batch of rectangular pieces of glass out from at least one sheet of glass. The method includes initializing including defining cutting constraints and positioning constraints for the pieces together with an optimization criterion; creating a tree comprising a root, leaves, each presenting a complete cutting plan enabling all of the pieces of the batch to be cut out, the cutting plan associated with a node of the tree being obtained by adding to the partial cutting plan associated with the parent node of the node, and in compliance with the constraints, the next piece for the frame determined in compliance with the sequence predetermined for the frame; and selecting a complete cutting plan associated with a leaf of the tree as a function of the optimization criterion.

A method for laser processing a transparent workpiece includes forming a contour line that includes defects, by directing a pulsed laser beam output by a beam source through an aspheric optical element positioned offset in a radial direction from the beam pathway and into the transparent workpiece such that the portion of the pulsed laser beam directed into the transparent workpiece generates an induced absorption within the transparent workpiece that produces a defect within the transparent workpiece. The portion of the pulsed laser beam directed into the transparent workpiece includes a wavelength λ, an effective spot size w.sub.o,eff, and a non-axisymmetric beam cross section having a minimum Rayleigh range Z.sub.Rx,min in an x-direction and a minimum Rayleigh range Z.sub.Ry,min in a y-direction. Further, the smaller of Z.sub.Rx,min and Z.sub.Ry,min is greater than $F_D=\frac{\pi w_{0,\mathrm{eff}}^2}{\lambda },$
where F.sub.D is a dimensionless divergence factor comprising a value of 10 or greater.