| 摘要 |
An insulated structure such as the door of a refrigeration appliance (Figure 7) is formed in one operation by simultaneously vacuum forming two layers of plastics material 7, 8 against respective tools 12, 13, which layers provide inner and outer skins of the structure, and bringing the tools together with such a force that material is displaced from the peripheral seam, in order to provide an integrated structure along the seam which lends strength to the seam. The displacement of the plastics material is made to such an extent that the thickness at the seam is less than one half of the combined thicknesses before the sheets were compressed. The space between the skins may be filled with foam or with solid filling material. The structure may be the cabinet of the appliance. |
