Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1975-12-05
1978-04-18
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
260876B, 260878B, 260879, 260880R, 264322, B29C 1302
Patent
active
040851869
ABSTRACT:
A hot melt composition for forming flowed-in closure liners or gaskets having a viscosity and resulting flow properties suitable for use in high speed, liner forming operations. The composition comprises between 20 and 55 percent of a thermoplastic elastomer chosen from the group consisting of block copolymers of the type having the general formula A-B-A or of the type having a plurality of chains of the general formula B-A radiating from a central hub. A is a thermoplastic segment, preferably polystyrene, and B is an elastomeric segment, preferably polybutadiene, polyisoprene, or polyethylene-butylene. The other ingredients in the composition may be extenders, antioxidants, fillers, pigments, lubricants, etc. as desired.
An in-situ molded crown liner, ring-seal bottle cap gasket, roll-on closure liner, CT (screw) cap gasket, lug cap gasket, and snap-on cap gasket, made from the composition and containing no PVC, are disclosed.
A hot melt process for producing liners is also disclosed which is characterized by the steps of providing a hot melt composition which cools to a coherent elastomeric mass, heating the composition to cause it to flow, depositing a metered amount of the molten liquid composition from a dispensing nozzle into a closure shell, shaping the composition to the desired shape, and cooling the formed liner.
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CPL Corporation
Thurlow Jeffery R.
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