IMPROVEMENTS IN EXTRUSION APPARATUS

• Main Author: HEGLER R P
• Format: Patent
• Language: English
• Published: 25.06.1977
• Edition: 2
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; MAKING GRANULES OR PREFORMS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

An improvement in an extruder head for extruding an outer tubular extrusion or sheath about an inner tube or cable which extrusion head has a means for passing an inner tube or cable through the extruder head which extruder head also terminates in a generally annular passage disposed about said inner tube or cable, the improvement residing in means for feeding molten material through an introducing passage at an angle to said extruder head and then into said annular passage, dividing means in said introducing passage for dividing said molten material into a stream of U-shaped cross-section, said dividing means including a leading parting edge; a method of producing a carrier ring which carries the dividing means by passing a machining tool into the introducing passage and passing the tool along paths having progressively larger U-shaped loops.