A method and apparatus for forming a container parison and container are disclosed. The method of forming a container parison in accordance with one aspect of the disclosure includes receiving molten glass in a forming mold having an open upper end, an open lower end, a forming chamber between the open upper and lower ends; supporting the molten glass in the forming mold at the open lower end thereof; and pressing the molten glass in the forming mold with a plunger to form a parison suspended downwardly from the neck finish and out of the open lower end of the mold.

A method for operating an IS machine for producing glass containers includes: introducing a glass gob into a blank mold, producing a parison from the glass gob in the blank mold, transferring the parison into a finishing mold, actuating a vacuum valve for producing a vacuum in the finishing mold from a first actuating point in time and simultaneously measuring the evolution of the vacuum pressure, actuating a finish-blowing valve for generating a finish-blowing pressure from a second actuating point in time that is later than the first actuating point in time by a predetermined duration, such that compressed air is blown into the finishing mold from the top, and simultaneously measuring the evolution of the finish-blowing pressure and checking whether the evolution of the measured vacuum pressure and/or the evolution of the measured finish-blowing pressure has fulfilled a predetermined condition.

A glass forming machine and a method for manufacturing formed glass parisons. A glass forming machine includes a blank side for forming parisons from gobs of molten glass. The blank side includes a plunger and a blank mould. The plunger can be moved into the blank mould up to an end position. The plunger can be moved out of the blank mould up to a start position. The glass forming machine includes a glass feeding device which is configured to bring a gob of molten glass into the blank mould. The glass forming machine includes a measuring device which is configured to measure the end position of the plunger. The glass feeding device is configured such that the size of a gob of molten glass depends on the end position previously reached during operation. Parisons of good quality can be produced with a bigger tolerance of mould volumina.

Provided is a method for manufacturing a glass container with which a glass container having a distinctively shaped inner space and excellent aesthetic appearance can be manufactured in good yield. The method for manufacturing a glass container includes steps (A) to (E). (A) A step of introducing a gob into a mold through a funnel. (B) A step of blowing air into the mold through the funnel, bringing a plunger disposed on a side opposite the side to which the funnel is fitted in contact with the gob, separating the plunger from the gob, and forming a recess on the surface of the gob. (C) A step of removing the funnel from the mold and fitting a baffle to the mold. (D) A step of blowing air from the plunger, and forming an inner space inside the gob with the recess as a starting point while simultaneously forming an outer shape by pressing the outer side of the gob to a molding surface of the mold to obtain a glass container of the final shape. (E) A step of transferring the glass container of the final shape to a cooling mold and cooling the same.

A mold and neck ring cooling system for a glass molding machine is characterized by a cooling air guide, in which separate and in particular independently switchable air guides for a neck ring cooling section- and a mold cooling section are provided. Here, a cooling piece serving the cooling air feed in the mold is connected to a station box via a cooling channel which is articulated on both sides and slidably connected on one side for length compensation, wherein the height position of the cooling piece is constant relative to the station box. A cooling structure intended for the neck ring cooling section is adjustable in its height in relation to the station box by means of a drive. All valves and bearing points are arranged protected against an environmental influence of a glassworks containing abrasive substances.

A mold and neck ring cooling system for a glass molding machine is characterized by a cooling air guide, in which separate and in particular independently switchable air guides for a neck ring cooling sectionand a mold cooling section are provided. Here, a cooling piece serving the cooling air feed in the mold is connected to a station box via a cooling channel which is articulated on both sides and slidably connected on one side for length compensation, wherein the height position of the cooling piece is constant relative to the station box. A cooling structure intended for the neck ring cooling section is adjustable in its height in relation to the station box by means of a drive. All valves and bearing points are arranged protected against an environmental influence of a glassworks containing abrasive substances.

A glass container blank mold includes a mold portion having a neck end, an opposite baffle end, and a molding surface located between the ends that partly defines the shape of an exterior surface of a glass parison formed in the mold. Axial cooling channels formed within the mold portion extend axially alongside the molding surface and radially outboard of the molding surface. Heat block channel locators are formed on one of the ends of the mold portion. Each locator is visibly discernible from the end on which the locator is formed and radially inboard of the cooling channels. Each locator has a thermally insignificant depth and is located such that, when a heat block channel having a thermally significant depth is formed at the locator, heat transfer characteristics of the mold portion are altered between the molding surface and at least one of the cooling channels.

A white glass container derived from a phase separation phenomenon of a halogen-free glass composition includes a neck portion and a body portion. The glass composition includes as ingredients at least SiO.sub.2, P.sub.2O.sub.5, Al.sub.2O.sub.3, B.sub.2O.sub.3, R.sub.2O (RNa or K), MgO, CaO and the like. The neck portion and the body portion respectively have a white multilayer structure formed to successively include a white transparent layer of relatively low white coloration and a white opaque layer of relatively high white coloration from the outer surface side. The contents of P.sub.2O.sub.5 in the white transparent layer are made smaller than the contents of P.sub.2O.sub.5 in the white opaque layer.

Provided is a method for manufacturing a glass container with which a glass container having a distinctively shaped inner space and excellent aesthetic appearance can be manufactured in good yield. The method for manufacturing a glass container includes steps (A) to (E). (A) A step of introducing a gob into a mold through a funnel. (B) A step of blowing air into the mold through the funnel, bringing a plunger disposed on a side opposite the side to which the funnel is fitted in contact with the gob, separating the plunger from the gob, and forming a recess on the surface of the gob. (C) A step of removing the funnel from the mold and fitting a baffle to the mold. (D) A step of blowing air from the plunger, and forming an inner space inside the gob with the recess as a starting point while simultaneously forming an outer shape by pressing the outer side of the gob to a molding surface of the mold to obtain a glass container of the final shape. (E) A step of transferring the glass container of the final shape to a cooling mold and cooling the same.

A closing mechanism for the mold halves of an I.S. machine, including two yoke-like mold holders mounted on parallel guides and movable between a closed position and an open position by means of a drive. A spindle transmission is provided laterally to at least one guide, the spindle transmission including a threaded spindle that is connected to the drive via a transmission and is in engagement with two threaded sleeves, each of which is connected to one of the two mold holders via two threaded sections running in opposite directions. By means of the drive, a servomotor, the opening and closing movement of the mold holders is carried out. Two pneumatically actuated piston-cylinder units are provided in order to apply the clamping force required between the mold holders or the mold halves in the closed position.