A nasal irrigator works only as well as its least reliable component — and the waste liquid tank is one of the parts users see and touch every single day. It collects the used saline solution, shows the liquid level through its walls, and seals against the device body between uses, so clarity, cleanliness and leak-free assembly are not optional extras: they are the product.
This solution page describes how Kunshan Maifeng Precision Industry Co., Ltd. (MIF) develops and produces custom waste liquid tanks for nasal care devices — from BPA-free PC material choice and transparent-part mold design to molding, inspection and clean packaging. The video and images below show the tank and the manufacturing process behind it.
Premium PC Material: BPA-Free and Highly Transparent
The tank is molded from BPA-free polycarbonate (PC), chosen for the combination personal care devices need most: high transparency so users can easily check the liquid inside, strong impact resistance for daily handling, and dimensional stability that keeps the tank sealing surfaces true over its service life. PC also withstands repeated contact with saline solution and cleaning, which makes it a dependable material for functional components in nasal irrigation equipment.
Material safety is treated as a documentation task, not a slogan. BPA-free resin certifications and lot-level traceability records are available per project, and for customers who position their device as a medical or wellness product, our ISO 13485 certified production system can be applied to the molding process.
Precision Design for Reliable Performance
Transparency is unforgiving: on a clear PC part, every flow mark, weld line, sink mark and gate trace is visible to the end user. The tank therefore demands more from the mold than an opaque housing of the same size — balanced gating, polished cavity steel and stable process windows are what keep the walls crystal clear shot after shot.
The structure itself is deceptively simple: an open cylindrical body, a central standpipe, a side channel and a leak-proof sealing rim. Each feature carries a job. The standpipe guides liquid flow away from the user, the side channel balances filling, and the sealing rim must stay dimensionally accurate so the tank mates with the device body without leakage. Fitting is verified against the actual mating parts, not just the drawings.
Custom Mold Development and Consistent Molding Quality
Behind the tank is a custom-built injection mold designed for transparent PC: high-polish cavities, carefully placed gates and cooling channels, and venting sized to avoid burn marks on visible surfaces. Our mold design team supports each project with a DFM review before steel is cut, and mold manufacturing happens in-house on more than 50 sets of machining equipment.
Once the sample is approved, process parameters are locked and monitored shot by shot. Each batch is checked for wall clarity, dimensional accuracy and assembly fit before shipment, so the tank that arrives with your device performs the same as the sample you approved.
From Molding to Clean Packaging
Because the tank is a visible component of a personal care device, handling after molding matters as much as molding itself. Parts move from the injection workshop through quality inspection to clean packaging, with protective packing that keeps the transparent walls scratch-free until they reach the assembly line.
Our workshop runs 36 single- and dual-color injection molding machines from 40 to 700 tons, so the process proven on samples carries directly into stable volume production — with the same material, the same mold and the same inspection criteria.
Information to Confirm Before Starting a Waste Tank Project
- Tank capacity, wall thickness and transparency requirements, plus any tint preference for the PC material.
- Mating parts data — device body, sealing rim geometry and lid or cap that the tank must fit.
- Liquid contact details — saline concentration, cleaning agents and any food-contact or BPA-free documentation needed.
- Target market and regulatory background, so the right material certifications are prepared.
- Expected volumes, critical dimensions, sample validation plan and packaging requirements.
Looking for a reliable partner for transparent PC parts and custom injection molds? Send us your drawings, samples or mating parts, and our engineering team will respond with a DFM review and mold proposal for your next nasal care project.
Contact Us
📩 Email: betty@mold-std.com | 📱 WhatsApp: +86 15370753830
Company Profile
About Us
Kunshan Maifeng Precision Industry Co., Ltd. (MIF) has an investment of RMB 35 million and an independent factory of more than 5,000 m². Our manufacturing resources include 36 single- and dual-color injection molding machines from 40 to 700 tons and more than 50 sets of mold manufacturing and processing equipment. Supported by a service, management and production team of over 100 people, we provide product design, mold design and manufacturing, injection molding, and product assembly. Our parent company was established in 2008.
1. Product Design
Product structure design and optimization based on customer drawings and samples.
2. Mold Design
Mold concepts developed around product requirements, material and production needs.
3. Mold Manufacturing
Machining, polishing, assembly and related processes for custom molds.
4. Injection Molding
Single- and dual-color molding capabilities for custom production.
5. Product Assembly
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