decorative panel
Perforated Metal
Slotted Hole Perforated Metal Sheet
Slotted (long-hole) perforated metal offers directional drainage, dewatering and a linear visual rhythm, with slots arranged end-to-end or side-by-side to suit filtration, facades and conveyor screens.
Description
Product Introduction
Slotted (long-hole) perforated metal offers directional drainage, dewatering and a linear visual rhythm, with slots arranged end-to-end or side-by-side to suit filtration, facades and conveyor screens.
Product Introduction
Slotted hole perforated metal, sometimes called long-hole or oblong perforation, replaces circular openings with elongated slots. This geometry is purpose-built for directional flow: liquids and fine material drain along the length of the slot far more readily than through a round hole, while the narrow width still retains the product being processed. Zhongman produces slots both end-to-end (creating bold horizontal or vertical lines) and side-by-side staggered for balanced strength. A common pattern is a 3 x 20 mm slot, but slot length, width and orientation are all configurable. The elongated opening also gives designers a strong linear graphic that reads very differently from a dot pattern, making slotted sheet popular for contemporary cladding.
Key Features & Advantages
The defining advantage of slots is dewatering and self-cleaning performance: the long aperture sheds water and resists blinding (clogging) far better than equivalent round holes, which is why it dominates fish-processing, mineral dewatering and conveyor applications. Orienting slots across the flow retains particles while passing liquid; orienting them along the flow maximizes throughput. Slots can deliver high open area while keeping each opening narrow, protecting fingers and small parts. Visually, the linear pattern can be run horizontally to emphasize width or vertically to emphasize height, giving architects a directional design tool. Edges are deburred for safe handling and ready coating, and the pattern fabricates and folds cleanly.
Specifications & Options
Typical slot widths range from 2 mm to 10 mm with lengths from 12 mm to 40 mm, arranged in end-staggered or side-staggered layouts to reach 30-60% open area. Fine slots such as 2 x 12 mm serve as dewatering and filtration screens; bold 10 x 40 mm slots suit drainage gratings and decorative cladding. We supply galvanized and carbon steel for industrial decks, marine-grade stainless 316L for fish and food processing, and aluminum for lightweight facades. Thickness spans 0.7 mm to 5 mm. Options include flow-direction orientation to your drawing, unperforated margins, formed channels and hems, and corrosion-resistant finishes. We can also combine slot sizes within one sheet for graded screening.
Applications & Industries
Slotted perforated metal is the screen of choice wherever liquids must separate from solids efficiently. Fish and seafood processors use stainless slotted decks for draining and grading; mineral and coal plants use them for dewatering fines; food and beverage lines use them where round holes would blind. In drainage and civil works, slotted sheet forms trench covers and gully gratings that pass water while trapping leaves. Conveyor and vibrating systems use slotted decks to dewater product in motion. Architecturally, the strong horizontal or vertical lines suit modern facades, sunscreens and balustrades that want movement and rhythm rather than a uniform dot field.
Why Choose Zhongman
Zhongman has deep experience with dewatering and drainage screens, where slot orientation and edge integrity directly affect process efficiency. We help customers choose slot dimensions and direction based on the particle size to be retained and the flow to be passed, not just on appearance. Our tooling produces clean, burr-free slots that resist clogging and tearing in high-cycle vibrating applications. Stainless 316L options are fully passivated for corrosive marine and food environments. We deliver mill certificates, open-area calculations and replacement-screen matching from samples, and we crate finished decks to arrive flat and undamaged. From a single drainage cover to repeat conveyor-screen orders, we are a reliable long-term partner.
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