| 摘要 |
PURPOSE:To prevent the lowering of heat insulating properties by diffusing steam into the air by dividing an extruded foam plate into two sections in the thickness direction thereof or peeling the skins only provided on one surfaces of the divided sections and directing the skins inwardly to mutually bond them by an adhesive. CONSTITUTION:An extruded foam plate with density of 10-50kg/m<2> composed of a styrenic resin has high density skins on the surfaces thereof. The extruded foam plate A is divided into two sections in its thickness direction to obtain two foam plates 2 having skins 1 on the single surfaces thereof and having no skins 1 on the opposite surfaces thereof. The foam plate is divided into two foam plates having equal thickness or divided into two foam plates different in thickness. These two foam plates are bonded back to back by an adhesive. In other words, the surfaces having the skins 1 of the foam plates are mutually opposed to be bonded by the adhesive. As the adhesive, a copolymer having a softening point lower than that of the styrenic resin, for example, a vinyl acetate/ethylene copolymer is pref. The adhesive film composed of the copolymer is held between the foam plates to be pressed to bond the foam plates. |
