As a professional manufacturer & factory from China, Shilong Machinery supplies semi-automatic piston paste filling machines. This pneumatic piston metering type is widely adopted in the market. Driven by an air cylinder, the piston works together with a one-way rotary valve (3-way valve) to complete two cycles: material suction and discharging. Operators place containers manually, and a foot switch serves as the trigger signal to finish one-time quantitative filling.
Seals on dual-head filling machines are mainly installed on filling pistons, valve seats and material cylinder inlets/outlets. They are reciprocating dynamic seals. Their core differences lie in five aspects: media resistance, temperature resistance, wear resistance, food compliance and cost.
Common defects of damaged caps include stripped cap threads, cracked cap tops, chipped cap edges, broken tamper-evident rings and worn internal threads. There are mainly four categories of causes: excessive torque, misalignment, inherent defects of bottle/cap raw materials, and improper material/high pressing force of the capping head.
Summary: Seals with the same structure, cylinder bore and valve type may be interchangeable. Most complete machine parts from different brands cannot be directly replaced. Blind mixing of parts is not recommended.
The automatic liquid pre‑made pouch packing machine adopts pre‑fabricated pouches. Compared with roll‑film form‑fill‑seal machines and semi‑automatic filling‑sealing equipment, its advantages are reflected in finished packaging quality, flexible production, hygiene & safety, automation level, and compatibility with materials and pouch types:
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