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The chamber lid of an electric nasal washer screws down over a water reservoir that gets carried, tipped and refilled daily. The lid shown here is that closure: a round twist cap with a finger recess moulded into its top, a twist open-close mechanism inside, and a sealing arrangement that holds when the chamber is pressurized by the pump.
Five views cover the top, the side, and the inside with its rib pattern. The inside is where the function sits: the twist track, the seal seat and the ribs that keep a round lid round.
A quarter-twist closure works differently from a screw cap. The lid rotates through a short arc into a locked position, guided by a cam track rather than a continuous thread, so opening is one motion and closing ends in a definite stop. The track and its mating lug on the chamber neck are designed together: engagement depth sets the seal compression, and the ramp angle sets how firmly the lid locks against pressure from inside the chamber.
The cam track is the tooling-critical feature. Its ramps are cored, its radii are held, and any flash along the track shows up immediately as a gritty or sticking twist. The first-article check runs the action dozens of times before the process window is signed off.
The elliptical recess in the top is not a styling choice. A twist lid needs a place where the thumb gets leverage, and the recess gives the thumb an edge to rock against before the twist begins. Its geometry, depth, edge radius and position on the diameter, is read against a wet hand, because the worst-case user has just rinsed the device. A recess that works dry fails slippery, and the difference is a millimetre of edge radius in the tool.
The chamber under this lid is not passive. The pump pressurizes it on every cycle, so the seal works against positive pressure rather than just holding standing water. The seal seat is a moulded groove with a defined cross-section, and the compression it applies is set by the cam engagement depth, which is why track depth and seal seat are dimensioned together rather than separately. A lid that seals dry and weeps under pressure has usually been designed as if the chamber were static.
Twist torque through the full arc, cycled across a sample from each lot. Seal under pressure, closed on the chamber and run with the pump. Recess edge condition, checked by thumb feel on a wet glove. Rib and track dimensions against the drawing, and colour against the approved master.
Kunshan Maifeng Precision Industry Co., Ltd. reviews device closure designs before quoting, builds the injection molds in house, and molds single-color and dual-color parts on 36 machines from 40 to 700 tons. Send us the chamber drawing and the pressure profile, and we will come back with a feasibility comment and a tooling proposal.
Kunshan Maifeng Precision Industry Co., Ltd. (MIF) has an investment of RMB 35 million and an independent factory of more than 5,000 m². The company operates 36 single- and dual-color injection molding machines from 40 to 700 tons, together with more than 50 sets of mold manufacturing and processing equipment. Our service, management and production team includes over 100 people.
Our parent company was established in 2008. We provide product design, mold design and manufacturing, injection molding and product assembly services for custom plastic parts, supporting both domestic and international customers.
1. Product Design
Product structure design and optimization based on customer drawings and samples.
2. Mold Design
Mold design developed around product geometry, material and production requirements.
3. Mold Manufacturing
Machining, polishing, fitting and assembly for custom injection molds.
4. Injection Molding
Single- and dual-color injection molding for project and order requirements.
5. Product Assembly
Supporting assembly services for molded plastic components.
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