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US 5,037,595 AGranted
Method of molding a plastic lid with barrier layer
AssigneeKornelis' Kunsthars Producten Industrie BV
InventorWiebren D. H. Kornelis
Life of this patent
Estimating the term…
Abstract
A method of making lids involves providing multiple mold parts which are movable between open and partially telescoped closed conditions, provision of a barrier strip or laminate which includes foamed plastic material, closing the mold parts to define a lid-shaped cavity with one of its inner and outer surfaces defined by a registered portion of the strip and spraying preheated plastic which adheres to the strip to fill the cavity and form the lid. The registered portion may be cut out during closing of the mold parts.
Claims15
The method of making lids for containers which comprises the steps of:
- (a) providing a plurality of mold parts which are movable between a separated condition having a space for passage of a strip of film material and a partially telescoped closed condition to define a lid-shaped mold cavity having inner and outer faces defined between a first mold part which is spaced from a second mold part;
- (b) moving the mold parts to the separated condition;
- (c) providing a continuous laminate strip comprised of a barrier plastic film material having limited oxygen permeability and a layer of foamed plastic material;
- (d) stepwise advancing the laminate strip through said space to register a portion of the laminate strip between the mold parts;
- (e) moving the mold parts to the partially telescoped closed condition with the registered portion of the laminate strip engaging said one mold part so that said one mold part with engaged registered portion of the strip defines one of said inner and outer faces of the mold cavity;
- (f) injecting preheated plastic material which adheres to the plastic film material into the mold cavity to fill the mold cavity and form a lid;
- (g) moving the mold parts to the separated condition and recovering a first lid having said registered portion adhered thereto;
- and
- (h) repeating steps (d)-(g) to recover a subsequent lid.
6 more elements
The method of making closures for containers which comprises the steps of:
- (a) providing a plurality of mold parts movable between a separated condition having a space for passage of a strip of film material and a partially telescoped closed condition to define a lid-shaped mold cavity having inner and outer face defined between a first mold part which is spaced from a second mold part;
- (b) moving the mold parts to the separated condition;
- (c) providing a continuous strip of barrier plastic film material having limited oxygen permeability;
- (d) stepwise advancing the strip of plastic film material through said space to register a portion of the strip between the mold parts;
- (e) moving the mold parts to the partially telescoped closed condition while cutting out the registered portion of the strip and advancing the cut-out registered portion by said one mold part into the mold cavity so that said one mold part with engaged registered portion of the strip defines said inner face of the mold cavity;
- (f) injecting preheated plastic material which adheres to the plastic film material into the mold cavity through said second mold part and against said registered portion so that the registered portion forms an inner surface of a closure;
- (h) moving the mold parts to the separated condition and recovering a first closure having said registered portion adhered thereto;
- and
- (i) repeating steps (d)-(h) to make and recover a subsequent closure.
6 more elements
The method of making closures for containers which comprises the steps of:
- (a) providing a plurality of mold pars which are movable between a separated condition having a space for passage of a strip of film material and a closed condition to define a lid-shaped mold cavity having inner and outer faces defined between a first mold part which is spaced from a second mold part;
- (b) moving the mold parts to the separated condition;
- (c) providing a continuous strip having limited oxygen permeability and comprised of a layer of foamed plastic material;
- (d) stepwise advancing the strip through said space to position a portion of the strip between the mold parts;
- (e) moving the mold parts to the closed condition with the portion of the strip engaging said one mold part so that said one mold part with engaged portion of the strip defines one of said inner and outer faces of the mold cavity;
- (f) injected preheated plastic material which adheres to the foamed plastic material into the mold cavity to fill the mold cavity and form a lid;
- (g) moving the mold parts to the separated condition and recovering a first lid having said strip portion adhered thereto;
- and
- (h) repeating steps (d)-(g) to recover a subsequent lid.
6 more elements
Dependencies are inferred from the claim text.