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Process for making a toothbrush - Patent 6066282 (3919 words) |
 | A process according to claim 4 wherein the second engagement part, on the handle, is formed engaged around the said projection in the manner of a socket surrounding the end of the projection such that the head and handle are retained together by a male-female type of engagement. |
| A process according to claim 3 wherein the second engagement part, on the handle, is formed engaged around the said projection in the manner of a socket surrounding the end of the projection such that the head and handle are retained together by a male-female type of engagement. |
| A process according to claim 1 wherein the first engagement part comprises a concavity in the basal end of the head, into which plastic material introduced during the moulding process in which the handle is made may flow and engage with the concavity. |
| Injection moulding - Wikipedia, the free encyclopedia (1528 words) |
| Considerable thought is put into the design of moulded parts and their moulds, to ensure that the parts will not be trapped in the mould, that the moulds can be completely filled before the molten resin solidifies, to compensate for material shrinkage, and to minimize imperfections in the parts. |
| Moulds separate into at least two halves (called the core and the cavity) to permit the part to be extracted. |
| The quality of the moulded part depends on the quality of the mould, the care taken during the moulding process, and design details of the part itself. |
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