Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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B29C
SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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53/00
Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
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B29C53/56
Winding and joining, e.g. winding spirally
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B29C53/60
using internal forming surfaces, e.g. mandrels
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B29C53/602
for tubular articles having closed or nearly closed ends, e.g. vessels, tanks, containers
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