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This is the outer housing of a desktop mini air purifier. It is a small box that sits on a desk, pulls room air through a hole field on the front and the top, passes it across a filter and a small fan, and pushes it back out. The housing is injection molded as two shells and finished in black or white, with a thin accent band running around the seam between them.
The top cover carries the vent pattern; the base carries the fan mount, the filter pocket and the feet. The two halves close on a parting line around the waist, and the accent band sits in that line, so the seam and the design feature are the same line. This page covers the color options, the air path, how the vent pattern is cut and how the two shells go together.
The housing runs in two colorways, and the thin band at the waist is the one place where a second color pays for itself. It can be produced in one of two ways. A two-shot molding builds the band into the part and gives the tightest possible joint, at the cost of a more complex tool and a longer cycle. A separate trim ring is cheaper to tool and easier to re-color for a new model year, but it is one more part to keep in stock and one more thing that can work loose in a bag. The choice follows the customer’s volume and how much the model line is expected to change.
Black and white also behave differently in the tool. Black hides flow marks and shows dust; white hides dust and shows flow marks and knit lines. The same mold, the same gate, two different sets of appearance problems. White is usually the harder one to get right, and it is worth saying so before the tool is cut rather than after.
Air has to enter, cross the filter and leave, and the housing is the duct. The intake field is large and low so it pulls air from desk level, the fan sits directly behind it, and the outlet is at the top where warm, cleaned air leaves without recirculating to the intake. The filter pocket is sized to the cartridge the customer specifies and is drafted so the cartridge slides in and out without scraping the wall; a pocket that grips too tightly is the fastest way to make an operator stop changing filters.
Wall thickness is a noise decision as much as a structural one. Thin walls amplify the fan and let the housing buzz; thick walls cost material, cool unevenly and add weight. The walls here stay near nominal and the fan mounts on cored bosses, not on the outer shell, so vibration goes into the mount rather than into the panel next to the user’s hand.
The hole field on this housing is more than a grid. The pattern includes curved slots and a repeating motif that has to read cleanly in both black and white, which means the cores are cut to a fixed draft and polished, and the pattern is held away from the parting line. A burr on one slot edge in a pattern like this is easy to spot and hard to fix after the tool is cut, so the steel is inspected against a sample part before production.
The pattern also constrains filling. Resin has to flow around a field of small cores without stalling, and the gate is placed so the flow front arrives at the far corner and the vent field together. Weld lines that form between adjacent cores are unavoidable; the job is to keep them short and uniform rather than to pretend they are not there.
When the two halves close, the seam has to be tight enough that the accent band reads as one continuous line. Screw bosses pull the halves together at four points, and a shallow tongue-and-groove along the rim keeps the seam from opening between them. A split that steps or gaps under office light is the first thing a buyer notices, and on a white unit it is nearly impossible to hide.
Rattle is the other assembly concern. Anything loose inside a small enclosure buzzes against the wall at the fan’s running speed, so the filter pocket and the fan bosses hold their parts on the moulded surfaces rather than in air. That is a small detail during design and an obvious defect during use.
Kunshan Maifeng Precision Industry Co., Ltd. reviews enclosure designs before quoting, builds the injection molds in house, and molds single-color and dual-color parts on 36 machines from 90 to 700 tons. Send us the housing 3D model and the internal component layout, 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 90 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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