Separating glass tube at separation point, comprises first heating hollow glass in region of separation point, cooling hollow glass in region of separation point, and second heating hollow glass in region of the separation point

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This invention describes a method and device for precisely separating hollow glass tubes, such as those used in making glass syringes, by controlled heating, cooling, and reheating at the separation point. The process uses lasers for heating and high-speed cooling with air, nitrogen, or water mist to create controlled stresses that result in a clean and accurate split along the desired line.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacturing of glass syringes for medical applications
• Production of laboratory glassware and tubing
• Fabrication of precision glass components for the chemical industry
• Assembly of glass parts in electronics or photonics devices

BenefitsContent extracted from patent full text and abstract with AI.

• Enables highly precise and clean separation of glass tubes, reducing waste and defects
• Improves safety by reducing the risk of uneven or sharp breaks
• Allows automation using lasers and controlled cooling, increasing production efficiency
• Applicable to borosilicate and other tough glass materials
• Better quality control in the manufacturing of medical and laboratory glassware

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Patent Abstract

The method comprises first heating a hollow glass in a region of a separation point, cooling (S5) the hollow glass in the region of the separation point, second heating the hollow glass in the region of the separation point, placing an initial scrubber to the separation point before heating or cooling by scribing, producing a first voltage reverse in the hollow glass at the separating point by a pressure- to tensile stress due to cooling after first heating, and producing a second voltage reverse at the separating point by a compression stress. The method comprises first heating a hollow glass in a region of a separation point, cooling (S5) the hollow glass in the region of the separation point, second heating the hollow glass in the region of the separation point, placing an initial scrubber to the separation point before heating or cooling by scribing, producing a first voltage reverse in the hollow glass at the separating point by a pressure- to tensile stress due to cooling after first heating, and producing a second voltage reverse at the separating point by a compression stress. A tubular glass body is separated at the separation point in two tube glass parts. The initial scrubber is placed at a depth of 0.02-0.1 mu m and over an angular range of less than 5[deg] . Borosilicate glass has a thermal stress of 130-135 Mpa. Thermal scrubber at the separation point is more than 0.3 mu m and less than 0.6 mu m. The steps of heating are carried out by a laser radiation. The first heating step takes place: to a temperature of 50-150 K below a transformation temperature of the glass; with a rotational speed of 250-350 revolutions per minute during a rotation; and in an axial width of 0.5-2 mm around the separation point. The first heating step is carried out with a heating rate of 200-500 K/s for a period of 0.5-10 seconds. The second heating step is carried out with a heating rate of 200-500 K/s for a period of 0.1-5 seconds. The second heating step takes place: with a rotational speed of 300-400 revolutions per minute during a rotation; and in an area of 0.5-5 mm around the separation point. The cooling step: takes place with a rotational speed of 250-350 revolutions per minute during a rotation and a cooling rate of 200-500 k/s for a period of 0.5-2 seconds; and is carried out by a cooling substance under production of a spray, where the cooling substance is air or nitrogen and/or a fog substance is water. The first and/or second heating steps and/or the cooling step continuously takes place during a complete rotation of the hollow glass. Independent claims are included for: (1) a device for separating hollow glass such as borosilicate-hollow glass at a separation point; (2) a method for producing a glass syringe; and (3) a glass hollow body such as glass syringe.