Needle closure system for moulds for hot and cold filling compounds with diaphragm cylinder actuation.

Abstract

A needle closure system for injecting hot and cold moulding compounds into cavities of moulds through injection points which can be closed and opened by a needle, the needles being moved by a hydraulically or pneumatically actuated cylinder, the cylinder having a diaphragm part which is elastic.

Description

[0001] 2S-08~2025“435Q230I-HauP tPos i-0010PCT / DE2025 / 000087 Needle Valve System for Molds with Hot and Filling Compounds with Membrane Description: The present invention is a needle valve system for molds with diaphragm cylinder actuation. In modern polymer processing, the injection point of molds for filling compounds such as thermoplastics and thermosets is opened with a needle before demolding to allow for sufficient filling and clean gate points. These needles are usually moved by hydraulic and pneumatic pressure cylinders. Due to thermal expansion, it is necessary to adjust the needle position relative to the injection point according to the temperature of the mold and filling compound. Various suppliers offer systems with components and seals, which are complicated and difficult to assemble. The mechanical effort involved in integrating the molds, especially mold assemblies, is higher. The needle valve system is suitable for hot runner applications. In contrast to cold runner injection, the needle valve system allows for the opening of the injection point.Material and thus environmental impact avoided. This and re-grinding of the sprue spider, just like hot runner applications without a needle, which, however, are more dependent on the design of the injection point and the thermally damaged filler material. 28-08-2025- 43502301 “Hau P tPOS t~001PCT / DE2025 / 000087, no optimal processing times are achieved. Cycle from the injection point to the injection point. Although needle valve systems are still used in polymer processing because of the costs, especially the pressure cylinders and processing described above. A needle valve system would be desirable for hot molds and fillers with diaphragm cylinder actuation, which has the aforementioned disadvantages of known systems. In needle valve systems, only strokes are usually handled with the proposed diaphragm cylinder system. In contrast to a piston cylinder system, the effort required to operate the cylinder is reduced by integrating various functions and elements of the piston cylinder system into the diaphragm part. This task is accomplished with the characteristics of the claim.Further developments and embodiments of the invention according to the further claims. According to the invention, a needle valve system for injection molding hot and molding compounds into cavities of molds can be closed by injection points with a needle, wherein needles are moved by a hydraulically or pneumatically driven cylinder, wherein the diaphragm part is preferably the mold pot. The diaphragm part preferably has a diameter on the side wall with a distance of the lower diaphragm piston stiffener. The diaphragm seal between the cylinder wall and cylinder cover is formed by a piston seal. The stroke of the diaphragm cylinder is deformable by a suitable dimensional design of the diaphragm side wall and diaphragm piston stiffener. The sealing of the needle is achieved by a radial sealing surface of the diaphragm bore, preferably with a large or preferably needle shaft diameter. To extend the needle stroke, a screw presses the needle stroke against the needle head.Needle head support plate diaphragm, whereby the resulting counter-pressure of the diaphragm material necessitates permanently complex mechanical solutions for the needle stroke. The diaphragm bores connecting screws upper diaphragm piston stiffener and diaphragm piston stiffener. The bores of the diaphragm can be provided with a molded sealing edge between the cylinder units. The upper diaphragm piston stiffener and diaphragm piston stiffener are preferably made of a suitable material, but can also be made of a suitable material, whereby the connecting screw for the diaphragm piston stiffeners can be self-tapping plastic screws. In a further design, the diaphragm and upper diaphragm piston stiffener and diaphragm piston stiffener are at least thermally connected to each other, or at least on the connecting screw for the diaphragm piston stiffener. Preferably, the mold mounting plate has a diaphragm cylinder bore with a working feature for the diaphragm sealing edge. The mold plate preferably has a diaphragm cylinder cover. The mold and mold plate have cooling bores and / orwith pneumatic connection bores, forward and return stroke. The membrane material is preferably made of thermoplastic polyurethane, but can also be made of another elastomer or a fluoroelastomer. Preferably, the movement of the membrane can be pneumatic, but hydraulic operation is also possible. 28-ü8-2025-43502301-HauptPos t~0013 PCT / DE2025 / 000087. The needle shaft seal is preferably shaped like a mold plate. The membrane cylinder is preferably round, but can also have other shapes, such as oval or elongated. It is also possible to have several needles in one membrane cylinder. The membrane sidewall is preferably 4-4 mm thick. The diameter of the membrane cylinder is preferably 40-80 mm. The stroke is preferably 2-10 mm. The stroke of the membrane cylinder can be limited by stroke limitation, preferably by membrane piston stiffening. The needle valve system with membrane cylinder actuation is preferably a needle valve hot runner system with clamping housing, but here needle valve-The hot runner nozzle on the mold plate allows the needle shaft to be connected to the needle shaft via the upper seals. The needle valve nozzle can also be connected to the diaphragm cylinder. The invention is described in more detail below with reference to the drawings. View from a low angle: needle valve hot runner system 28 with two needle valve nozzles 35 and next to the gate nozzle. The needle 1 between the diaphragm piston stiffener and the hot runner nozzle 35 is connected to the needle valve hot runner system with two needle valve nozzles and next to the gate nozzle. The needle 1 is connected to the needle valve hot runner system with two needle valve nozzles and next to the gate nozzle. The needle valve nozzle of the diaphragm cylinder is connected to the upper diaphragm piston stiffener. Diaphragm part 2 with the diaphragm sealing edge and diaphragm piston stiffener 7 is connected to the needle valve hot runner system with two needle valve nozzles and next to the gate nozzle. View from a low angle: needle valve hot runner system with two needle valve nozzles and next to the gate nozzle. Via needle valve nozzle, upper diaphragm piston stiffening, diaphragm part with theMembrane sealing edge and sealing screw to 4 a through needle valve hot runner system mold plates Top mold mounting plate Below mold plate 20 the also the membrane cylinder cover 24 The membrane part 2 from membrane piston wall membrane side wall 4 and membrane sealing edge The seal 25 the membrane cylinder cover and needle shaft seal Mold 22 seal on the mold plate 20 and on the upper of the needle valve hot runner nozzle 29 To be seen 16 the needle stroke over needle head 14 over needle head support plate membrane piston wall thereby pressed in The sealing screw 1 adjusting bore with seal the membrane cylinder With connecting screw membrane piston stiffener upper membrane piston stiffener 6 and membrane piston stiffener 7 with membrane piston wall clamped in between The pneumatic connection bores 27 above the upper membrane piston stiffener 6 and lower membrane piston stiffener The membrane cylinder with its piston movement volume. 28-Qg-2Ö25“43502301“HauP tPQS1-0015 PCT / DE2025 / 000087 After preferred embodiments of the invention have been described with reference to the accompanying drawings, the invention is limited to precise embodiments and various changes and modifications thereto can be carried out by a person skilled in the art without departing from the scope of the invention as set forth in the accompanying claims.

[0002] 28-08-2025-43502301“HauP iPos t-0016 PCT / DE2025 / 000087 Diaphragm cylinder Diaphragm part Diaphragm piston wall Diaphragm side wall Diaphragm sealing edge Upper diaphragm piston stiffener Lower diaphragm piston stiffener Connecting screw Diaphragm piston stiffener Bore Connecting screws Bore Needle Radial sealing surface of the diaphragm bore to the needle Sealing edge Bores Needle Needle head Needle head support plate Screw Needle stroke Adjustment bore Needle stroke Sealing screw Adjustment bore with seal Mold mounting plate Mold plate Machining the diaphragm sealing edge. Needle shaft seal Mold Diaphragm cylinder bore Diaphragm cylinder cover Seal in the diaphragm cylinder cover Cooling bores Pneumatic connection bores Needle valve hot runner system with clamping housing. Needle valve hot runner nozzle Upper seals Needle valve nozzle Needle shaft

Claims

28-Ö8“2025-43502301“HaufliPos i-0018PCT / DE2025 / 000087 Claim 1 Needle valve system for injection molding hot and molding compounds into cavities of molds through injection points, which can be closed with a needle, wherein needles are moved by a hydraulically or pneumatically driven cylinder, characterized in that the cylinder diaphragm part of the needle valve system according to claim 1 is characterized in that the diaphragm part is connected to the upper diaphragm piston stiffener and / or diaphragm piston stiffener and that the diaphragm piston wall is connected to the stiffening piston stiffener(s) of the needle valve system according to claim 1 and characterized in that the diaphragm part is connected to the upper diaphragm piston stiffener and / or diaphragm piston stiffener and the diaphragm piston wall is preferably clamped by screws between the upper diaphragm piston stiffener and diaphragm piston stiffener of the needle valve system according to claim 1, characterized in thatThe needle is passed through the diaphragm part via a bore which, against the needle shaft, is characterized by a needle locking system according to the claim and by an upper diaphragm piston stiffening and / or a diaphragm piston stiffening made of a fiber-reinforced polymer. 28“08-2025“4350230 l~HauPtPas t-0013 PCT / DE2025 / 000087 Needle valve system according to claim characterized in that the stroke of the needle Needle valve system according to claim characterized in that, stroke of the needle by the needle head preferably via needle head support plate by screwing in the screw the needle stroke by pressing in the diaphragm piston stiffener Needle valve system according to claim and 7 characterized in that, screw the needle stroke by adjusting bore the needle stroke and by sealing screw adjusting bore with seal again Needle valve system according to claim characterized in that the diaphragm part is cup-shaped and the diaphragm side wall facing away from the upper diaphragm piston stiffener has a larger diameter at the upper diaphragm piston Needle valve system according to claim characterized in that the diaphragm has a diaphragm sealing edge with the diaphragm clampable between diaphragm cylinder bore and a diaphragm cylinder cover and diaphragm cylinder- 28-08”2025-43502301-HauP tPOS t"0020 PCT / DE2025 / 000087 bore and diaphragm cylinder cover against each other Needle valve system according to claim and at least one of the preceding claims, characterized in that diaphragm cylinder bore mounting plate form Needle valve system according to claim and at least one of the preceding claims, characterized in that form plate receiving the diaphragm cylinder cover Needle valve system according to claim and at least one of the preceding claims, characterized in that sealing of the needle shaft to the form form plate by one or more sealing rings Needle valve system according to claim and at least one of the preceding claims, characterized in that the diaphragm part is made of a thermoplastic polyurethane, an elastomer or also of a fluoropolymer Needle valve system according to claim and at least one of the preceding claims?, characterized in that,that the stroke of the diaphragm cylinder 2-10 mm 28-08-2025-4350230 “Hau P Po “002PCT / DE2025 / 000087 Needle valve system according to claim and at least one of the preceding claims, characterized in that the diameter of the cylinder 40-80 mm Needle valve system according to claim and at least one of the preceding claims, characterized in that the shape of the diaphragm cylinder can be circular but also oval or elongated. Needle valve system according to claim and at least one of the preceding claims, characterized in that the diaphragm cylinder has several needles Needle valve system according to claim and at least one of the preceding claims, characterized in that the diaphragm cylinder is for filling molds or molded parts in the area of ​​liquid or CO2.

Images