Foil-blowing apparatus and method

Details Foil-blowing apparatus and method Foil-blowing apparatus and method

1990-10-16

1992-05-05

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

2642098, 26421112, 264564, 425141, 425162, 4253261, 425377, 425381, 425466, B29C 4716, B29C 4792

Patent

active

051105187

ABSTRACT:
A foil-blowing apparatus has at least one deformable lip defining the annular orifice from which the thermoplastic tube which is blown to form the coil is extruded. The lip can be provided with an array of effectors which, in response to a thickness-profile measuring unit, can radially deform the lip to correct thickness errors. The lip can be under prestress and the radial deformation is effected by measuring the thickness and superimposing a radial force on the prestress.

REFERENCES:
patent: 3988582 (1976-10-01), Harman
patent: 4339404 (1982-07-01), Upmeier et al.
patent: 4351785 (1982-09-01), Upmeier et al.
patent: 4594063 (1986-06-01), Reifenhauser et al.
patent: 4741686 (1988-05-01), Cazzani et al.

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