Universal Self-Dosing Bottle Cap
Budget: ₹600 – ₹1,500 INR
I am developing a cap that stores an additive inside its cavity, screws onto any standard drink bottle, and—on the first twist—snaps an internal seal so the contents drop cleanly into the liquid. I need a product-oriented mechanical engineer who can take this idea from concept to manufacturable design.
Core requirements
• Material: plastic suitable for food contact and injection-molding.
• Colour: custom; shades will change with each flavour, so the design must allow easy colour-masterbatch swaps during production.
• Compatibility: the cap has to engage reliably with common PET neck finishes (PCO 1810, 1881, 38 mm, etc.) without additional adaptors.
• Mechanism: an integrated seal or diaphragm must break only when the consumer reaches full torque; once fractured, all enclosed components must fall freely into the bottle without lodging in the thread.
• Shelf life: ingredients stay fully sealed against moisture and oxygen until activation.
Please supply
1. 3D CAD models (STEP + native file) showing the cap, seal, and release mechanism.
2. Engineering drawings with dimensions, tolerances, and material call-outs.
3. Draft DFM report highlighting gating, draft angles, and estimated tool splits for injection molding.
4. Simple FEA or hand calculations proving the seal’s burst strength and the cap’s torque resistance.
5. A short BOM and assembly instructions so a mould-maker can quote with confidence.
Acceptance criteria
– Fits and seals against carbonated and still beverage bottles under 4 bar internal pressure.
– Breaks the seal consistently at 0.7–1.2 N·m application torque.
– No component fragments remain in the neck or thread after activation.
– CAD passes a 0.8 mm minimum wall-thickness check for PP or HDPE.
If you have prior work on sports-drink caps, dosing closures, or child-resistant lids, that experience will be invaluable here. Let me know how you would approach prototyping and how quickly you can turn an initial concept into a 3D-printed or machined sample.
Core requirements
• Material: plastic suitable for food contact and injection-molding.
• Colour: custom; shades will change with each flavour, so the design must allow easy colour-masterbatch swaps during production.
• Compatibility: the cap has to engage reliably with common PET neck finishes (PCO 1810, 1881, 38 mm, etc.) without additional adaptors.
• Mechanism: an integrated seal or diaphragm must break only when the consumer reaches full torque; once fractured, all enclosed components must fall freely into the bottle without lodging in the thread.
• Shelf life: ingredients stay fully sealed against moisture and oxygen until activation.
Please supply
1. 3D CAD models (STEP + native file) showing the cap, seal, and release mechanism.
2. Engineering drawings with dimensions, tolerances, and material call-outs.
3. Draft DFM report highlighting gating, draft angles, and estimated tool splits for injection molding.
4. Simple FEA or hand calculations proving the seal’s burst strength and the cap’s torque resistance.
5. A short BOM and assembly instructions so a mould-maker can quote with confidence.
Acceptance criteria
– Fits and seals against carbonated and still beverage bottles under 4 bar internal pressure.
– Breaks the seal consistently at 0.7–1.2 N·m application torque.
– No component fragments remain in the neck or thread after activation.
– CAD passes a 0.8 mm minimum wall-thickness check for PP or HDPE.
If you have prior work on sports-drink caps, dosing closures, or child-resistant lids, that experience will be invaluable here. Let me know how you would approach prototyping and how quickly you can turn an initial concept into a 3D-printed or machined sample.