METHOD OF MAKING A UNITARY BRUSH HEAD AND UNITARY TOOTHBRUSH HEAD
The present application is concerned with a method of manufacturing a unitary brush head, in particular a unitary toothbrush head, the unitary brush head having a base and at least one filament extending from a filament side of the base, the method comprising the steps of injecting molten plastic material into a mold cavity having a pre-base cavity and at least one filament cavity extending from the pre-base cavity, compressing the molten plastic material once it is essentially filling the pre-base cavity by impressing at least one punching tool into the molten plastic material from the rear side of the pre-base cavity being opposite to a side from which the at least one filament cavity extends, and filling the at least one filament cavity with the molten plastic material under the continuous impression of the punching tool. The molten plastic material in particular has a melt flow rate of about 30 g/10 min or lower measured in accordance with ISO 1133. The present invention is also concerned with a brush having a unitary brush head.
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Published patent application
Disclosure date: 09-28-2017
Publication date: 04-03-2019
Applicant: PROCTER & GAMBLE, US
Inventor: EIMANN KLAUS, DE ; GÖRICH GERALD, DE ; GÖTZ NICOLAS, DE ; SCHNIZER HARALD, DE
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