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US 9,420,877 B2Granted
Method for producing a toothbrush having an inner cavity
AssigneeThe Procter & Gamble Company
InventorsLi Wen, Matthew Lloyd Newman, Andrew Joseph Horton, Stephen Alan Houghton, Scott Andrew Jackson, Bradley John Phillips, Hansjoerg Reick, Richard Darren Satterfield, Andrew M. Uhe, George Michael West, Christopher Thomas Ryan, Francisco Emanuel Alves, Kyle Ali Muhammad
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Abstract
Methods of producing a unitary personal care article such as a toothbrush having an inner cavity.
Claims20
A method for extrusion blow molding a unitary toothbrush having an inner cavity comprising:
- a) providing an extrusion blow mold having a longitudinal axis and a cavity, the cavity having a head portion, neck portion and handle portion and a surface that defines a cross-sectional area;
- wherein the cavity has at least one of a greater cross-sectional area, bordered by two smaller cross-sectional areas along the longitudinal axis of the blow mold or a lesser cross-sectional area bordered by two greater cross-sectional areas along the longitudinal axis of the blow mold;
- b) extruding a parison comprising a thermoplastic resin, the parison includes an interior cavity and an outer surface, wherein the outer surface defines a cross-sectional area of the parison;
- c) closing the blow mold;
- d) expanding the parison using a fluid to contact the cavity surface and subassembly to produce a toothbrush handle having an inner cavity;
- wherein the head portion of the blow mold cavity comprises one or more movable tuft hole pins.
3 more elements
A method for extrusion blow molding a unitary toothbrush having an inner cavity comprising:
- a) providing an extrusion blow mold having a longitudinal axis and a cavity, the cavity having a head portion, neck portion and handle portion and a surface that defines a cross-sectional area;
- wherein the cavity has at least one of a greater cross-sectional area, bordered by two smaller cross-sectional areas along the longitudinal axis of the blow mold or a lesser cross-sectional area bordered by two greater cross-sectional areas along the longitudinal axis of the blow mold;
- b) extruding a parison comprising a thermoplastic resin, the parison includes an interior cavity and an outer surface, wherein the outer surface defines a cross-sectional area of the parison;
- c) closing the blow mold;
- d) expanding the parison using a fluid to contact the cavity surface and subassembly to produce a toothbrush handle having an inner cavity;
- wherein the head portion of the blow mold cavity comprises one or more tuft hole pins having about a 1 degree to about 4 degree draft.
3 more elements
Dependencies are inferred from the claim text.