Männer Multi-component production using side valve gate nozzle
Initially developed for manufacturing injection bodies and tubular geometries, the side valve gate nozzle Männer Edgeline is now used in a variety of applications. Some production solutions can even be implemented using only lateral injection.
The side valve gate nozzle from hot runner specialist Männer features valve pins that move at a right angle with respect to the opening and closing of the mould. With its advanced capabilities, Edgeline lets users enjoy the benefits of a hot runner system with the original cylindrical valve gate – featuring defined pin opening and closing, cosmetic gate quality, resin savings, and above all high process reliability, even in applications requiring side injection. The capability of the Edgeline valve gate system becomes evident in the production of two-component screw caps, Männer says.
The patented side valve gate system is used in a 24+24-cavity two-component cube mould. The screw cap is made of PP with an inner TPE seal. Cube technology permits the process steps for mould-filling component 1, cooling, mould-filling component 2, and demoulding to take place simultaneously, significantly reducing cycle time. Additional benefits of cube technology include a higher number of cavities within the same working surface and an improved energy footprint. The cube mould works with a Männer single-drop valve gate system and the Männer Edgeline side valve gate system.
While the lid is usually injection-moulded first and then the sealing ring, the use of the Edgeline system permits a different approach. In the first parting plane, the TPE seal is laterally injection-moulded by the Edgeline nozzle. On this nozzle, specially developed for side injection moulding, the nozzle body, complete with pneumatics, lies in the direction of the mould as usual.
However, the pins move at right angles to the opening and closing direction of the mould, rather than in the same direction. This enables the nozzle body to be positioned so that it does not collide with the cube-sided mould core. The actual lid injection is moulded over the seal in the second parting plane only. This innovative solution can be put into practice with lateral injection only.
Suitable for wide range of plastic resins
The Edgeline valve gate nozzle covers a wide range of plastic resins. The system is ideal for processing even glass substitutes such as COC or COP, which are, for example, used in the production of prefilled syringes. The nozzle design helps to maximise stress-free resin processing, making Edgeline suitable not only for commodity resins, but also for sensitive and demanding resins.
An extended pin opening stroke has made it possible to increase the open flow area, reducing the required pressure through the nozzle. The heater elements for the nozzle body, nozzle tip, and the nozzle base, along with special heat-conducting materials, are some of the key features for reaching an optimal temperature profile along the entire flow path.
The patented Männer Edgeline system enables the benefits of cylindrical valve gates to be used even with lateral injection. Benefits include defined opening and closing of the valve pins, superior gate quality, material savings, and above all, excellent process reliability. It also enables innovative solutions to be used, such as cube technology for two-component products.