PURPOSE: To provide a double pipe type expansible straw in which accuracy in size as designed in the extrusion molding is accurately maintained, reliability of products is improved, the amount of usable blank is reduced, cost reduction is achieved and an aluminum foil or the like of a pack can surely be broken through in use.
CONSTITUTION: The outside and inside pipes 3, 2 of a double pipe type expansible straw 1 are adapted to have 1.5-3.0/10min of melt flow index, 8,000-12,000kg/cm2 of modulus of elasticity, satisfactory accuracy in working, high reliability of products, low reduced cost and improved yield. The thickness of the outside and inside pipes is even, the sectional shape is fixed to a perfectly circular one, the extrusion amount is stabilized, the yield of products is improved, low cost is achieved, defective working is not generated and uniform productivity is maintained.
SUZUKI HODAKA
ABE MASAMI
| JPS62186815A | 1987-08-15 | |||
| JPS60256414A | 1985-12-18 |