Method for making a writing or coloring pencil by triple extrusion and writing or coloring pencil comprising an intermediate protective layer

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United States of America Patent

PATENT NO 6572295
SERIAL NO

09913196

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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The method of continuously manufacturing pencils or crayons consists in coextruding a filled first thermoplastic material referred to as 'lead' material, and around it both an intermediate 'protective' layer of a thermoplastic material having no expanding agent and a second thermoplastic material containing an expanding agent and referred to as 'wood' material, and in cooling said coextruded thermoplastic materials. According to the invention, the thermoplastic material constituting the protective layer is determined so that during cooling it remains deformable while the lead material shrinks. The pencil is constituted by superposing a core of a filled first thermoplastic material referred to as 'lead' material, a protective layer of a non-expanded thermoplastic material, and a layer of an expanded second thermoplastic material referred to as 'wood' material. According to the invention, the thermoplastic material constituting the protective layer has a solidification point which is lower than that of the thermoplastic material constituting the lead material.

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Patent Owner(s)

Patent OwnerAddress
CONTE62200 BOULOGNE SUR MER

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bachelet, Jacques Cremarest, FR 2 34
Baillieu, Helene Samer, FR 1 22
Chochoy, Ludovic Wierre Effroy, FR 1 22
Foscarin, Lucien St. Hilaire le Grand, FR 1 22

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