Melamine 2 Cavity Mould | For Large Bowls & Platters – PANLONG
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Melamine 2 Cavity Mould | For Large Bowls & Platters – PANLONG
Product Overview
Cavity count on a large piece is not a preference - it is the answer to an arithmetic question. A dinner plate, a deep serving bowl or a platter covers a lot of the mould platen, and the closing force the press has to deliver scales with that covered surface. Two cavities is where most oversized tableware lands
The PANLONG two-cavity melamine mould is built for that bracket. Both cavities are cut as a matched pair from one machining programme and fed from a balanced path, so the two pieces of a cycle finish together instead of one waiting on the other. It suits factories whose range runs to large plates, deep bowls and platters, and who need a mould that stays inside the press they already own
Why a Large Piece Only Runs Two Cavities
When a buyer asks for four or six cavities on a large plate, the intention is to lower cost per piece. On a big part the opposite usually happens, and it is worth understanding why before the block is cut
(1)The press force has to cover the total projected area of every cavity at once, plus the runner and the overflow
(2)On a large piece that area grows faster than the output does, so extra cavities push the tool past what the press can close safely
(3)A press running short does not fail loudly - it shows up as incomplete rims, weak corners, hazy patches and a reject rate that climbs quietly through the shift
The rule we work to: the bigger the piece, the lower the cavity count that pays. If your range is oversized tableware, a two-cavity tool sized to your press keeps quality predictable and cost per piece honest
- Two Cavities, Two Balanced Fill Paths
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With two cavities there is nothing to average out. If one fills or cures differently from the other, half of your output is affected, so the feed path is designed as a pair rather than as one cavity repeate
（1）Symmetrical gate placement so compound reaches both cavity rims at the same moment
（2）Matched overflow pockets so both cavities release surplus compound the same way
（3）Both halves cut from one machining programme, then measured against each other rather than only individually
（4）Cavity depth and wall thickness re-checked after polishing, not only after machining
Why Cavity Spacing Matters on a Large Tool
Cavities cannot simply be pushed together to fit a platen, and on a large tool the spacing is doing real work.
（1）The steel between the cavities has to carry the closing force without flexing
（2）Spacing also sets how evenly heat reaches the outer cavity across the block
（3）Ejector hardware and cooling passages need room between the cavities, not under the frame
（4）We confirm the spacing against your platen drawing before the block is ordered
Steel, Chrome and Big-Surface Polish
Large flat and deep-drawn surfaces show defects far more readily than small ones. On a plate the eye travels across a wide area, so haze, swirl marks or a dull patch are noticed immediately - which is why the finishing stage matters as much as the machining stage
(1)P20 / 718 pre-hardened mould steel for the block, machined and then hand-finished
(2)Hard chrome plated cavities that resist abrasion from the compound over long runs
(3)Mirror polish on the cavity face and on the rim radius, which is where the gloss of the finished piece is decided
(4)Re-polishing restores the surface after long production instead of replacing the tool
FAQ
Question1： Why can a large dinner plate only run two cavities?
Because of projected area. The press has to apply force across every cavity's surface at the same time, and a large plate already consumes a lot of that force on its own. Add more cavities and the press runs short, which shows up as incomplete rims and rising rejects rather than as higher output. Two cavities on a large plate is the layout that keeps the tool inside the press
Question2：What happens if the press tonnage is short for two large cavities?
The parts do not simply come out thinner. Short fill appears as weak corners, patchy gloss, incomplete rims and a reject rate that rises through the shift. If your press is marginal, the honest answer is a smaller cavity or a different press, not a mould that never runs comfortably
Question3：Why are both cavities cut from a single machining programme?
Because on a two-cavity tool the pair is the product. Cutting both halves from one programme, then measuring them against each other for depth and wall thickness, is what keeps the two pieces of a cycle identical. It also means a single cavity can later be re-machined or re-polished back to the same depth as its partner
Question4：How do you stop two heavy cavities from flexing the block?
Through block thickness and the spacing between the cavities. The steel between two large cavities carries the full closing force, so it is sized for that load rather than to the minimum that fits the platen. That is also why a two-cavity large-part tool is heavier than it looks like it needs to be
Question5: How is a two-cavity mould proven before it ships?
We run the tool on a press of the matching tonnage, check fill, rim quality and finish on both cavities, and compare the pieces cavity against cavity. Sample pieces from both sides travel with the tool so you can repeat the comparison on arrival