US Patent No: 4,919,864
Number of patents in Portfolio can not be more than 2000
Method for making multicolored foam
Stats
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Apr 24, 1990
Issued date -
Feb 26, 1988
filing date -
07/162,792
serial no -
Expired
status
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Abstract
A method and apparatus for the preparation of multicolor, multidensity and/or multithermoplastic foam and products composed thereof. Heat-plastified foamable gels of a thermoplastic resin or resins containing blowing agents are combined and extruded simultaneously through the same orifice of a die and expanded into a foam. The color, density and/or thermoplastic resin of the secondary foamed gel or gels can form a multitude of patterns or shapes that include waves, diagonals, stripes and/or continuous coverage over the entire surface of the primary foamed gel. These patterns or shapes can be on the surface and/or within the cross-section of the primary foamed gel.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,248,824 Method and apparatus for striping extruded polymer products | 27 | 1979 | |
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| 4,182,734 Method for producing foamed plastic insulated wires | 4 | 1978 | |
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| 4,181,647 Process for extrusion coating of a wire with a cellular thermoplastic resin material | 51 | 1976 | |