| 摘要 |
A liquid melt comprising gelatin and water, optionally together with a polyhydric alcohol plasticizer therefor, is prepared by passing a mixture of solid gelatin and water, optionally with plasticizer, through an elongate tube (1) whilst subjecting the mixture to the action of a high frequency alternating electric field, generated for example from a pair of electrodes (9) mounted opposite each other outside the tube, to heat the mixture and convert it into a liquid melt. The elongate tube may be heated, e.g. by passing hot air around it, to prevent condensation of water vapour and the melting operation is suitably carried out under reduced pressure. |
