Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Reshaping running or indefinite-length work
Patent
1978-05-24
1980-07-08
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Reshaping running or indefinite-length work
29132, 425363, 425373, 425385, B29C 1700
Patent
active
042117437
ABSTRACT:
Apparatus for embossing web material such as a heated thermoplastic web material comprises first and second embossing members each having a resilient embossing surface, and means mounting the embossing members for relative movement to define a roll nip between them. The resilient surface of the first embossing member has a primary embossing pattern thereon and is of harder durometer than the resilient surface of the second embossing member. Both resilient surfaces are soft enough to be temporarily deformed in the roll nip to press the web material between them into surface conforming contact with the primary embossing pattern. The temporary deformation also helps to expel air from between the web material and the primary embossing pattern to insure surface conforming contact of the web to the embossing pattern. A secondary embossing pattern is provided on the resilient surface of the second embossing member and is of lesser depth than the primary embossing pattern. The temporary deformation assists in providing full contact with both patterns.
A method of embossing the material includes heating the thermoplastic web material to a temperature within its softening range, introducing the heated material to a nip formed between the first and second embossing members, and allowing the embossed material to cool to set the pattern before removing it from the first embossing member.
REFERENCES:
patent: 2928124 (1960-03-01), Hugger
patent: 2947058 (1960-08-01), Landells et al.
patent: 3060515 (1962-10-01), Corbett
patent: 3539671 (1970-11-01), Nauta
patent: 3605194 (1971-09-01), Nauta
patent: 3636147 (1972-01-01), Rowland
patent: 3751550 (1973-08-01), Nauta
patent: 3839514 (1974-10-01), Nauta
patent: 3911187 (1975-10-01), Raley
patent: 3950480 (1976-04-01), Adams et al.
Kos Jacob J.
Nauta Jan P.
Lowe James B.
Nauta Roll Corporation
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