1. Is forming width the same as sheet width?

No. Sheet must extend beyond the forming area on both edges for clamping and chain or chainless transport. The usable forming width is smaller than the sheet width by that margin.

2. Can a wider machine run narrow sheet?

It can, with edge guides and adjusted clamping, but the machine runs below its capability and the heating zones outside the sheet are wasted. A machine sized to the intended product range is more efficient.

3. How many cavities fit across the width?

Divide the usable forming width by the pitch of one cavity, including the gap between cavities and the trim allowance. The result is the number of columns, and it must be a whole number.

4. Does the extruder have to match the forming width?

The extruder's die width sets the maximum sheet width, so the forming machine cannot exceed it. When forming width grows, the die and the winder are usually the parts that change.

5. What about thickness?

Thinner sheet draws faster and needs less heat; thicker sheet needs more heat time and reduces cycle rate. Width and thickness together define the output the extruder must deliver.

6. Can one line serve several product widths?

Yes, with slitting on the winder and adjustable edge guides. Slitting adds trim that must be handled, usually by an in-line granulator returning regrind.

7. Does mould layout affect the answer?

It does. Rotating a cavity layout or nesting round parts differently can add a column or reduce trim, changing the economics without changing the machine.

8. What should be specified first?

The product, then the mould layout, then the forming width, then the sheet width, then the extruder die. Specifying in the other direction usually produces a line that is either oversized or constrained.

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Product Snapshot (Structured Summary)

• Product Name: Thermoforming Machine, Cup Making Machine and Sheet Extrusion Machine
• Category: Plastic sheet and forming equipment
• Primary Use: Matching sheet width, forming width and cavity layout on one production line
• Representative Models / Specs: DSI-PP, LSI series, SI-PE sheet lines; FS-8556, HSS-8556, HAI-8556 cup machines; multi-station and vacuum-type thermoformers
• Materials: PP, PS, HIPS, PVC, PET, PLA, PE and biodegradable materials
• Applications: Cup, tray and clamshell production requiring width and gauge alignment