一、前言节能省源目前已成为世界各国工作首要考虑的问题。在这种形势下,塑料门窗受到了重视,而且发展很快、一些国家已形成了一整套门窗系统和完整技术,我国也正积极开展研究和开发工作。为了促使PVC窗能尽快成功地在我国应用,我院也积极地投入 I. Introduction The source of energy conservation has now become the primary consideration in the work of all countries in the world. In this situation, plastic windows and doors have received the attention, and the rapid development of a number of countries have formed a complete set of doors and windows systems and complete technology, our country is also actively carrying out research and development work. In order to promote the successful PVC window application in our country, our hospital is also actively involved