The present invention provides a glass wool cutting device. The device includes a cutting section housing that has a cutting section chamber, a feed port that is connected to the cutting section chamber, and a discharge port that is connected to the cutting section chamber. A stationary knife is disposed on the cutting section housing to protrude into the cutting section chamber and a movable cutter that has a rotary support body is disposed in the cutting section chamber and a movable knife is supported on the rotary support body to apply a shearing force to the glass wool together with the stationary knife. Additionally, a cutter actuator provides a driving force to the rotary support body.

A bundle includes five or more cut elongated glass elements. Each cut elongated glass element includes a first end, a cylindrical portion, and a second end. At least one of the following equations is fulfilled: i) (I.sub.center(max)−I.sub.center(min))/I.sub.center(mean)≤4.0×10.sup.−2 [μm/μm]; or ii) (I.sub.continuous(max)−I.sub.continuous(min))/I.sub.center(mean)≤4.0×10.sup.−2 [μm/μm]. I.sub.center(max) is a maximum center inner diameter of the cylindrical portions of all cut elongated glass elements; I.sub.center(min) is a minimum center inner diameter of the cylindrical portion of all cut elongated glass elements; I.sub.center(mean) is a mean of inner diameters at a center of the cylindrical portions of all cut elongated glass elements; I.sub.continuous(max) is a maximum continuous inner diameter of the cylindrical portion of any single cut elongated glass element; and I.sub.continuous(min) is a minimum continuous inner diameter of the cylindrical portion of the single cut elongated glass element.

A bundle includes five or more cut elongated glass elements. Each cut elongated glass element includes a first end, a cylindrical portion, and a second end. At least one of the following equations is fulfilled: i) (I.sub.center(max)−I.sub.center(min))/I.sub.center(mean)≤4.0×10.sup.−2 [μm/μm]; or ii) (I.sub.continuous(max)−I.sub.continuous(min))/I.sub.center(mean)≤4.0×10.sup.−2 [μm/μm]. I.sub.center(max) is a maximum center inner diameter of the cylindrical portions of all cut elongated glass elements; I.sub.center(min) is a minimum center inner diameter of the cylindrical portion of all cut elongated glass elements; I.sub.center(mean) is a mean of inner diameters at a center of the cylindrical portions of all cut elongated glass elements; I.sub.continuous(max) is a maximum continuous inner diameter of the cylindrical portion of any single cut elongated glass element; and I.sub.continuous(min) is a minimum continuous inner diameter of the cylindrical portion of the single cut elongated glass element.

A cleaving assembly and a method for cleaving a glass body having a face at a desired angle greater than 0 degrees are disclosed. The assembly comprises a laser device for emitting a laser beam, a rotating device, and a positioning fixture. The rotating device has a head that rotates about a central axis that is orthogonal to the laser beam. The positioning fixture is operatively mounted to the head and centered axially along the central axis and is also rotatably driven by the rotating device. The positioning fixture has a tapered surface that is transverse to the central axis and that supports the glass body at a predetermined angle relative to the central axis. Rotation of the positioning fixture about the central axis when the glass body is exposed to the laser beam, cleaves the face of the glass body at the desired angle due to the glass body being supported transverse to the central axis.

A cleaving assembly and a method for cleaving a glass body having a face at a desired angle greater than 0 degrees are disclosed. The assembly comprises a laser device for emitting a laser beam, a rotating device, and a positioning fixture. The rotating device has a head that rotates about a central axis that is orthogonal to the laser beam. The positioning fixture is operatively mounted to the head and centered axially along the central axis and is also rotatably driven by the rotating device. The positioning fixture has a tapered surface that is transverse to the central axis and that supports the glass body at a predetermined angle relative to the central axis. Rotation of the positioning fixture about the central axis when the glass body is exposed to the laser beam, cleaves the face of the glass body at the desired angle due to the glass body being supported transverse to the central axis.

The present disclosure provides a novel glass filler that has a low permittivity and is suitable for mass production. A glass filler provided includes a glass composition that includes, in wt %, for example, 40≤SiO.sub.2≤60, 25≤B.sub.2O.sub.3≤45, 0<Al.sub.2O.sub.3≤18, 0<R.sub.2O≤5, and 0≤RO≤12, and satisfies at least one of: i) SiO.sub.2+B.sub.2O.sub.3≥80 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9; and ii) SiO.sub.2+B.sub.2O.sub.3≥78, SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9, and 0<RO<10. Another glass filler provided includes a glass composition that includes SiO.sub.2, B.sub.2O.sub.3, Al.sub.2O.sub.3, R.sub.2O, and 3<RO<8 at the same contents as the above, and satisfies SiO.sub.2+B.sub.2O.sub.3≥75 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3<97, where R.sub.2O=Li.sub.2O+Na.sub.2O+K.sub.2O and RO=MgO+CaO+SrO.

The present disclosure provides a novel glass filler that has a low permittivity and is suitable for mass production. A glass filler provided includes a glass composition that includes, in wt %, for example, 40≤SiO.sub.2≤60, 25≤B.sub.2O.sub.3≤45, 0<Al.sub.2O.sub.3≤18, 0<R.sub.2O≤5, and 0≤RO≤12, and satisfies at least one of: i) SiO.sub.2+B.sub.2O.sub.3≥80 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9; and ii) SiO.sub.2+B.sub.2O.sub.3≥78, SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3≤99.9, and 0<RO<10. Another glass filler provided includes a glass composition that includes SiO.sub.2, B.sub.2O.sub.3, Al.sub.2O.sub.3, R.sub.2O, and 3<RO<8 at the same contents as the above, and satisfies SiO.sub.2+B.sub.2O.sub.3≥75 and SiO.sub.2+B.sub.2O.sub.3+Al.sub.2O.sub.3<97, where R.sub.2O=Li.sub.2O+Na.sub.2O+K.sub.2O and RO=MgO+CaO+SrO.

A method for adjusting an etchability of a first borosilicate glass by heating the first borosilicate glass; combining the first borosilicate glass with a second borosilicate glass to form a composite; and etching the composite with an etchant. A material having a protrusive phase and a recessive phase, where the protrusive phase protrudes from the recessive phase to form a plurality of nanoscale surface features, and where the protrusive phase and the recessive phase have the same composition.

A method for adjusting an etchability of a first borosilicate glass by heating the first borosilicate glass; combining the first borosilicate glass with a second borosilicate glass to form a composite; and etching the composite with an etchant. A material having a protrusive phase and a recessive phase, where the protrusive phase protrudes from the recessive phase to form a plurality of nanoscale surface features, and where the protrusive phase and the recessive phase have the same composition.

An optical fiber cutter includes: a fiber holder that holds optical fibers disposed in a row in a first perpendicular direction perpendicular to a longitudinal direction of the optical fibers, wherein each of the optical fibers includes a glass portion and a coated portion that covers the glass portion; an alignment member having an insertion hole through which the glass portions extending from the fiber holder are inserted; a base including; a first placement portion on which the fiber holder is disposed; and a second placement portion positioned at a distance from the first placement portion, and on which the alignment member is disposed; and a blade member that scratches surfaces of the glass portions by moving in the first perpendicular direction between the first placement portion and the second placement portion with respect to the base.