Plastic bottle e tunnelling shield: o que têm em comum
- Passo 1. Plastic bottle — utiliza — Injection moulding. Preforms are moulded and then blown.
- Passo 2. Injection moulding — utiliza — Hydraulics (Pascal’s law). Hydraulic presses.
- Passo 3. Hydraulics (Pascal’s law) — é utilizado em — Hydraulic cylinder. The liquid transmits pressure to the piston.
- Passo 4. Hydraulic cylinder — é utilizado em — Tunnelling shield. The shield was pushed forward by jacks.