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US 4,215,797 AGranted
Plastic containers and lids therefor
AssigneeConsumers Glass Company Limited
InventorAlex C. Chen
Life of this patent
Estimating the term…
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AssigneeConsumers Glass Company Limited
InventorAlex C. Chen
Estimating the term…
Reusable plastic container and plastic lid therefor, the lid being hermetically sealed to the container by a set adhesive. The set adhesive has a greater attraction for the lid plastic than for the container plastic. Such attraction is sufficient to ensure that, on removing the lid from the container, the adhesive is peeled from the container rim and removed with the reusable lid. This leaves the container rim essentially free of adhesive to reduce the likelihood of contaminating the contained product with adhesive chemicals. The lid or the container rim may be coated with the adhesive prior to heat-seal. In the instance where the container is coated with the adhesive, the rim ledge portion may be provided with at least one continuous circumferentially extending raised portion to facilitate coating of the container rim. Processes for manufacturing the adhesive-coated container lid and forming the container rim portion and applying adhesive thereto are disclosed.
Reusable plastic container in combination with reusable plastic lid, said lid being hermetically sealed to said container by a set hot-melt thermoplastic adhesive between opposing surfaces of cooperating lid and container rim, a layer of said adhesive having been applied to said container rim prior to said lid having been heat-sealed to said container rim, said thermoplastic adhesive when set having a greater affinity for the lid plastic material than for the container plastic material, such affinity being sufficient to ensure that on removing said lid from container, such thermoplastic adhesive is peeled from the container rim and thereby removed with the reusable lid.
Reusable plastic container and plastic lid therefor, said lid plastic being an acrylic multi-polymer, the lid being hermetically sealed to said container by a set hot-melt ethylene-vinylacetate co-polymer adhesive composition between opposing surfaces of cooperating lid and container rim, said container plastic being a high impact polystyrene, said adhesive when set having a greater affinity for the lid plastic material than for the container plastic material, such affinity being sufficient to ensure that on removing said lid from said container, such thermoplastic adhesive is peeled from the container rim and thereby removed with the reusable lid.
Dependencies are inferred from the claim text.