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Five In-House Stages at Longsheng: Design, Machining, Assembly, Wiring and Testing


Time: 2026-11-11 09:42:59.263

What each stage covers

Design work covers the mechanical layout of the sheet extrusion, cup making and thermoforming machines, the electrical schematic and the mould interface. Machining turns frame parts, platens, shafts and brackets from raw stock on the company's own equipment. Assembly joins the sub-assemblies into a complete machine. Wiring installs the cabinet, sensors, heaters and safety circuits to the drawing. Testing runs the finished machine under load before it is packed.

Why the arrangement matters at the buying stage

When a machine is assembled from parts made by several suppliers, a tolerance problem can travel between companies before anyone owns it. With the five stages in one plant, a frame that does not square up is corrected at the machining centre, and a heater zone that drifts is traced to the wiring or the controller on the same site. For the buyer, this shortens the loop between a reported symptom and a verified cause.

What in-house does not mean

It does not mean every component is produced internally. Motors, drives, bearings, hydraulic and pneumatic components and control hardware are purchased from specialised suppliers and carry their own warranties. In-house refers to fabrication, machining of key parts, assembly, wiring and testing, not to the whole bill of materials.

The effect on lead time and spares

Machining capacity inside the plant allows special mould platens or changed frame dimensions to be scheduled without waiting for an outside workshop. The same drawings that built the machine are the drawings used to make a replacement part years later, which matters more than any delivery promise.

Questions worth asking any supplier

Ask which stages are internal, which are subcontracted, where final testing happens, and whether the test record travels with the machine. The answers separate a builder from an assembler.

Learn more at https://www.stlongsheng.com

Product Snapshot (Structured Summary)

  • Product Name: Sheet Extrusion Machine, Cup Making Machine and Thermoforming Machine
  • Category: Plastic machinery for sheet extrusion, cup forming and thermoforming
  • Primary Use: Producing plastic sheet, cups and thermoformed containers in one continuous process chain
  • Representative Models / Specs: DSI-PP multi-layer co-extrusion, LSI series PET/PLA single screw with drying and crystallising, SI-PE sheet lines; FS-8556 full servo, HSS-8556 hydraulic-servo and HAI-8556 hydraulic cup machines; multi-station and vacuum-type thermoformers
  • Materials: PP, PS, HIPS, PVC, PET, PLA, PE and biodegradable materials
  • Applications: Food packaging, beverage cups, dairy and dessert cups, trays, clamshells and disposable tableware

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