Technical Details of Side‑Feeding BarrelStructural Geometry• The barrel body features a twin‑screw figure‑eight intermeshing inner cavity. The center‑to‑center distance of the two bores is strictly controlled to accommodate side‑feeding liners and ensure proper working clearance between screw elements and liners. • A side‑feeding port is machined on the barrel side, aligned with the twin‑screw intermeshing zone. The inner wall of the port is provided with smooth rounded transitions to reduce material adhesion and accumulation. • Locating shoulders on both‑end flanges enable docking with adjacent barrel sections. Bolt holes and sealing grooves are machined on flanges to guarantee reliable sealing between barrel sections and prevent melt leakage. • Circulating heating‑cooling channels are built into the barrel wall, together with thermocouple mounting holes for segmented temperature control. The barrel can be fitted with closed liners, open‑type liners, C‑type split liners and monolithic liners. • The side‑feeding port is compatible with side‑feeder flanges for horizontal or lateral material feeding. Barrel lengths are available from 1D to 8D according to process requirements for modular assembly. Material Configuration• Barrel body: 42CrMo alloy steel, quenched and tempered to secure overall rigidity and anti‑deformation performance. • Optional inner liners: • 38CrMoAlA nitrided steel: For general compounding applications, cost‑effective with nitriding hardening treatment. • WR5 powder alloy: High wear resistance for glass‑fiber‑filled and standard high‑filling compounding. • WR13 powder alloy: Wear‑resistant and corrosion‑resistant for battery slurry and corrosive material systems. • Nickel‑base alloy / Hastelloy: For highly corrosive conditions including fluoroplastics and reactive extrusion. Manufacturing Process• Forged blank for barrel body with quenching‑and‑tempering heat treatment to improve strength and thermal‑deformation resistance. • CNC boring of the figure‑eight inner cavity to guarantee precision of center‑to‑center distance, roundness and coaxiality. • Milling of the side‑feeding port; all sharp edges of the port are rounded to eliminate material‑stagnation dead zones. • Precision machining of barrel cooling‑heating channels to ensure unobstructed water circulation without leakage; finishing of both‑end flange locating shoulders and sealing grooves. • Inner liners are assembled by interference press‑fitting. Liner inner surfaces can be treated by nitriding, HIP hot isostatic pressing or laser cladding of hard‑alloy coating. Inner‑cavity dimensions are strictly controlled to ensure unilateral clearance between screws and liners and maintain cavity self‑cleaning performance. Process Parameter Characteristics• Maximum operating temperature: 350 °C • Assembly mode: Barrel sections connected by flange bolts; liners interference‑press‑fitted into barrel housing. • Unilateral working clearance of liner: 0.2‑0.4 mm (varies with machine model). • Built‑in heating‑cooling channels enable segmented temperature control for materials. • Side‑feeding port is aligned with screw intermeshing zone to ensure auxiliary materials enter the material flow smoothly. • Liner selection affects material‑accumulation risk: C‑type split liners feature easy disassembly and low cost, yet carry slight material‑accumulation risk at joint seams; monolithic liners have no joint seams and are suitable for heat‑sensitive materials and frequent color‑change production. | Functions of Side‑Feeding Barrel•Provide mounting base for lateral feeding: Offers installation interface for side‑feeding equipment to feed glass fiber, fillers, powder, recycled materials and other auxiliary materials into the twin‑screw intermeshing zone. Step‑by‑step feeding prevents premature thermal degradation of auxiliary materials. •Load‑bearing protection to reduce spare‑part costs: The barrel body does not come into direct contact with materials. Wear and corrosion are concentrated on replaceable liners. Only liners need replacement when worn, while the barrel body can be reused for long‑term service, lowering maintenance costs. •Form figure‑eight process cavity: Creates working cavity for screw elements, ensures normal intermeshing operation of twin‑screws, and maintains stable process conditions for material conveying and mixing. •Realize segmented temperature‑control heat exchange: Built‑in water‑cooling / heating channels conduct heat via liners to achieve precise temperature control for side‑feeding‑section materials, suppressing premature melting, agglomeration and overflow of powder materials. •Optimize material flow and reduce stagnation: Rounded‑edge design of the side‑feeding port combined with different liners minimizes material adhesion, carbon deposition and char particles. Suitable for various working conditions including general compounding, high filling, frequent color‑change and heat‑sensitive‑material processing. |
