Abstract: Apparatus and methods for applying liquid onto a substrate include a nozzle configured to be connected to a liquid source. The nozzle further includes a distribution passage with a length that can receive the liquid. A piston is positioned in the distribution passage and a slit-shaped nozzle opening is in fluid communication with the distribution passage. The piston is movable in the distribution passage so as to vary the length that can receive the liquid. The nozzle opening communicates with the distribution passage via a plurality of spaced apart outlet channels having respective outlet ends. The outlet channels are formed between first and second nozzle pieces each having a tip portion at the outlet ends. At least one of the first or second nozzle pieces is flexible at the tip such that the outlet ends open when under positive fluid pressure and close when the fluid pressure is reduced.

Abstract: A device for dispensing fluid onto a substrate includes a basic body, a fluid supply channel connectible to a fluid source for supplying the fluid, and a nozzle assembly which has a distribution channel that communicates with the fluid supply channel and which has an essentially elongated slit that communicates with the distribution channel. The slit includes at least one discharge opening for dispensing the fluid. The effective length of the distribution channel is variable by means of a closure element that is movable in the distribution channel. An equalization channel is connected with the distribution channel, and the volume of the equalization channel is adjustable.

Abstract: Apparatus and methods for applying liquid onto a substrate include a nozzle configured to be connected to a liquid source. The nozzle further includes a distribution passage with a length that can receive the liquid. A piston is positioned in the distribution passage and a slit-shaped nozzle opening is in fluid communication with the distribution passage. The piston is movable in the distribution passage so as to vary the length that can receive the liquid. The nozzle opening communicates with the distribution passage via a plurality of spaced apart outlet channels having respective outlet ends. The outlet channels are formed between first and second nozzle pieces each having a tip portion at the outlet ends. At least one of the first or second nozzle pieces is flexible at the tip such that the outlet ends open when under positive fluid pressure and close when the fluid pressure is reduced.

Abstract: Apparatus and methods for applying liquid onto a substrate include a nozzle configured to be connected to a liquid source. The nozzle further includes a distribution passage with a length that can receive the liquid. A piston is positioned in the distribution passage and a slit-shaped nozzle opening is in fluid communication with the distribution passage. The piston is movable in the distribution passage so as to vary the length that can receive the liquid. The nozzle opening communicates with the distribution passage via a plurality of spaced apart outlet channels having respective outlet ends. The outlet channels are formed between first and second nozzle pieces each having a tip portion at the outlet ends. At least one of the first or second nozzle pieces is flexible at the tip such that the outlet ends open when under positive fluid pressure and close when the fluid pressure is reduced.

Abstract: An apparatus for applying fluids such as adhesive, in particular hot melt adhesive, to a substrate movable relative to the apparatus, comprising a main body having a feed passage connectable to a fluid source, an application valve for selectively interrupting or enabling the flow of fluid in the feed passage, and a nozzle arrangement having a distributor passage connectable to the feed passage and at least one nozzle opening communicating with the distributor passage for delivery of the fluid. A body is movable in the distributor passage and has through passages which can be selectively associated with the nozzle opening by means of movement of the body in such a way that fluid is passed out of the distributor passage into the nozzle opening through at least one through passage.

Abstract: A dispenser of viscous fluid, in at least one embodiment a hot melt glue adhesive, has a heater element, an adhesive source, a main common passage, and a series of valves that all fluidly connect to the main passage. A sheet of receiving material, such as an envelope, has hot melt glue applied to its surface as it passes under the series of valves. A variable amount of valves can be activated by moving control rods inwardly or outwardly of the main common passage. The moving control rods have indicator markers, a securing screw and are housed in U-shaped beds which collectively make adjusting the dispensing pattern very easy.

Abstract: Apparatus for applying fluids such as adhesive, in particular hot melt adhesive, to a substrate. The apparatus includes a main body which can be connected to a fluid source, an application valve for selectively interrupting or enabling a flow of fluid, and a nozzle arrangement arranged on the main body for applying the fluid. The nozzle includes a distributor passage communicating with the fluid source, and the nozzle arrangement has at least one outlet opening for delivery of the fluid, which communicates with the distributor passage, and a closure body arranged movably in the distributor passage for varying the length, which can be acted upon with fluid, of the distributor passage. The distributor passage is provided in a one-piece portion of the nozzle arrangement.

Abstract: Apparatus and methods for applying liquid onto a substrate include a nozzle configured to be connected to a liquid source. The nozzle further includes a distribution passage with a length that can receive the liquid. A piston is positioned in the distribution passage and a slit-shaped nozzle opening is in fluid communication with the distribution passage. The piston is movable in the distribution passage so as to vary the length that can receive the liquid. The nozzle opening communicates with the distribution passage via a plurality of spaced apart outlet channels having respective outlet ends. The outlet channels are formed between first and second nozzle pieces each having a tip portion at the outlet ends. At least one of the first or second nozzle pieces is flexible at the tip such that the outlet ends open when under positive fluid pressure and close when the fluid pressure is reduced.

Abstract: A device for dispensing fluid onto a substrate includes a basic body, a fluid supply channel connectible to a fluid source for supplying the fluid, and a nozzle assembly which has a distribution channel that communicates with the fluid supply channel and which has an essentially elongated slit that communicates with the distribution channel. The slit includes at least one discharge opening for dispensing the fluid. The effective length of the distribution channel is variable by means of a closure element that is movable in the distribution channel. An equalization channel is connected with the distribution channel, and the volume of the equalization channel is adjustable.

Abstract: Apparatus for applying fluids such as adhesive, in particular hot-melt glue, onto a substrate that is movable relative to the apparatus. The apparatus includes a basic body (12) and an applicator valve (22) for selective interruption or release of the stream of fluid. The basic body (12) is connectable to a fluid source and includes a slit-shaped nozzle opening (54) that communicates with a distribution channel (14), and a piston (16) that is movably situated in the distribution channel (14), by means of which the length of the distribution channel (14) which may be supplied with fluid is variable. The nozzle opening (54) communicates with the distribution channel (14) by means of a plurality of output channels (18) spaced at a distance from each other.

Abstract: An apparatus for applying fluids such as adhesive, in particular hot melt adhesive, to a substrate movable relative to the apparatus, comprising a main body having a feed passage connectable to a fluid source, an application valve for selectively interrupting or enabling the flow of fluid in the feed passage, and a nozzle arrangement having a distributor passage connectable to the feed passage and at least one nozzle opening communicating with the distributor passage for delivery of the fluid. A body is movable in the distributor passage and has through passages which can be selectively associated with the nozzle opening by means of movement of the body in such a way that fluid is passed out of the distributor passage into the nozzle opening through at least one through passage.

Abstract: Apparatus for applying fluids such as adhesive, in particular hot melt adhesive, to a substrate. The apparatus includes a main body which can be connected to a fluid source, an application valve for selectively interrupting or enabling a flow of fluid, and a nozzle arrangement arranged on the main body for applying the fluid. The nozzle includes a distributor passage communicating with the fluid source, and the nozzle arrangement has at least one outlet opening for delivery of the fluid, which communicates with the distributor passage, and a closure body arranged movably in the distributor passage for varying the length, which can be acted upon with fluid, of the distributor passage. The distributor passage is provided in a one-piece portion of the nozzle arrangement.

Abstract: An apparatus for applying fluids such as adhesive, in particular hot melt adhesive, to a substrate movable relative to the apparatus. The apparatus includes a main body in which a fluid feed passage is connectable to a fluid source, and a nozzle arrangement which is arranged on the main body and which is separable therefrom and in which there is arranged a distributor passage by way of which the nozzle opening communicates with the fluid feed passage. The apparatus also includes a closure body which is movable with a drive device and which is arranged in the distributor passage and by means of which the length of the distributor passage which can be acted upon with fluid is variable. The closure body can be fixed in various positions by means of a fixing device.

Abstract: Apparatus for applying fluids such as adhesive, in particular hot-melt glue, onto a substrate that is movable relative to the apparatus. The apparatus includes a basic body (12) and an applicator valve (22) for selective interruption or release of the stream of fluid. The basic body (12) is connectable to a fluid source and includes a slit-shaped nozzle opening (54) that communicates with a distribution channel (14), and a piston (16) that is movably situated in the distribution channel (14), by means of which the length of the distribution channel (14) which may be supplied with fluid is variable. The nozzle opening (54) communicates with the distribution channel (14) by means of a plurality of output channels (18) spaced at a distance from each other.

Abstract: A device for dispensing fluid material onto a substrate including a base body with a flow channel for receiving the fluid material and a movable valve body positioned in the flow channel. The valve body is movable in a downstream direction into an open position to release a flow of the fluid material into the flow channel and is movable in an upstream direction into a closed position to interrupt the flow of the fluid material into the flow channel. A drive device moves the valve body between the open position and the closed position. A cylindrical chamber is positioned in the flow channel and the valve body includes a piston movable within the cylindrical chamber. The piston is sealed within the cylindrical chamber in such a way that when the piston moves in a first direction within the cylindrical chamber, the fluid material is displaced from the flow channel and when the piston is moved in a second direction opposite to the first direction, the fluid material is drawn into the flow channel.

Abstract: A device for dispensing fluid material onto a substrate including a base body with a flow channel for receiving the fluid material and a movable valve body positioned in the flow channel. The valve body is movable in a downstream direction into an open position to release a flow of the fluid material into the flow channel and is movable in an upstream direction into a closed position to interrupt the flow of the fluid material into the flow channel. A drive device moves the valve body between the open position and the closed position. A cylindrical chamber is positioned in the flow channel and the valve body includes a piston movable within the cylindrical chamber. The piston is sealed within the cylindrical chamber in such a way that when the piston moves in a first direction within the cylindrical chamber, the fluid material is displaced from the flow channel and when the piston is moved in a second direction opposite to the first direction, the fluid material is drawn into the flow channel.