Bottles and jars – Closures – With separate applied fastener to hold closure in closed...
Patent
1981-05-28
1983-10-11
Norton, Donald F.
Bottles and jars
Closures
With separate applied fastener to hold closure in closed...
B65D 4530
Patent
active
044086946
ABSTRACT:
A dimensionally stable plastic canning ring for securing vacuum sealing lids to food containers during processing, is fabricated of thermoplastic material reinforced with fibers. The fibers are circumferentially aligned in the plastic media whereby the canning ring exhibits thermal expansion which is lowest in the direction of fiber alignment, i.e., circumferentially. The circumferential thermal coefficient of expansion substantially matches that of a glass container with which the canning ring is utilized. Due to the similarity of thermal coefficients of expansion, relative dimensional differences between the plastic ring and the glass container occurring during processing are negligible. The ring is manufactured by an injection molding process. The mold cavity includes a single gate disposed generally adjacent its periphery. Injection of the plastic and fiber material into the mold through the single gate causes laminar circumferential flow about the mold cavity and alignment of the fibers with the circumferential flow streamlines.
REFERENCES:
patent: 2999275 (1961-09-01), Blume
patent: 3263274 (1966-08-01), Pickels
patent: 3404203 (1968-10-01), Donald
patent: 3432295 (1969-03-01), Frank et al.
patent: 4093094 (1978-06-01), Smalley et al.
Click M. E.
Nelson J. R.
Norton Donald F.
Owens--Illinois, Inc.
Wilson D. H.
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