Thin Wall Space Cup Mould Manufacturer: The Tooling Behind the Cup That Has to Be Cheap

A thin wall space cup is the plastic cup for the yogurt, the dessert, the snack, or the single-serve portion. The wall is under a millimeter, sometimes half that. The cup has to be cheap enough to produce by the million and rigid enough to stack and seal. The thin wall space cup mould manufacturer builds the tooling that fills the thin cavity, cools it in seconds, and ejects the cup without cracking the rim.

The Fill Is a Race

The molten plastic enters the cavity and starts to freeze on contact with the steel. The thin wall gives the melt almost no time to fill the cup before the flow front solidifies. The gate and the runner have to deliver the melt fast. The injection pressure is high, and the mold has to hold the clamping force without flashing.

A thin wall space cup mould manufacturer sizes the gate for the fill rate and the material. A gate that is too small leaves a short shot. One that is too large leaves a heavy gate vestige that has to be trimmed.

The Core Is the Hardest Part to Cool

The core forms the inside of the cup. It sits in the middle of the part and the heat has nowhere to go. The cavity side is easier to cool because the channels can be drilled close to the surface. The core needs the internal cooling, the bubbler, or the spiral baffle, to pull the heat from the center.

A thin wall space cup mould manufacturer that cools the core properly hits the cycle time. The cup that comes out of a poorly cooled mold warps at the rim and the seal fails.

The Rim Has to Stay Round

The cup seals with the foil or the lid. The rim is the sealing surface. It has to be round and flat. The thin wall makes the rim the weakest part of the part. The ejection has to push on the rim without deforming it.

A thin wall space cup mould manufacturer uses the stripper ring or the plate that pushes the cup off the core evenly. The ejector pins on the base would deform the thin bottom. The stripper ring on the rim releases the cup without the distortion.

Here is what a thin wall space cup mould manufacturer has to deliver:

• Gate and runner sized for the fast fill
• Cooling channels in the cavity and the internal cooling in the core
• Round, flat rim with the controlled tolerance
• Stripper ring or plate ejection that does not deform the cup
• Multi-cavity layout with the balanced fill
• Material-specific shrinkage allowance

Where the Cups Go

The dairy fills the cup with the yogurt and the dessert. The snack producer fills the cup with the pudding and the fruit. The single-serve market uses the cup for the portion control. Each one needs the seal and the stack.

The Rim That Warps

The rim warps because the core cooling was not enough. The cup sticks because the draft was too small or the core surface was too rough. The rim cracks during ejection because the stripper ring was not aligned. The wall shorts because the gate was too small. Each one is a tooling decision the converter discovers on the line.

A thin wall space cup mould manufacturer builds the tooling behind the cup that has to be cheap. The cavity fills fast. The core cools. The rim stays round. Choose a manufacturer that controls the fill and the cooling.