| 摘要 |
This invention relates to a 3-layer co-extruded biaxial-oriented pearly synthetic paper label used for integrally molding with bottle in mold; more particularly, it relates to a manufacturing equipment and method of said 3-layer co-extruded biaxial-oriented pearly synthetic paper label. The pearly synthetic paper label produced by the manufacturing method of this invention has a 3-layer structure which is layer-laminated with a printing paper surface layer, a foamed intermediate layer, and an in-mold label-adhered layer; the pearly synthetic paper label can be applied in the blow-mold or eject-mold of polypropylene(PP) bottle or of high density poyethylene(HDPE) bottle, in which the pearly synthetic paper label is integrally molded by heat adhesion with the PP bottle or HDPE bottle under being molded in the mold; meanwhile, the abnormal situation like encapsulated air bubbles is prevented from happening so as to make the PP (or HDPE) bottle which is integrally molded with label have an excellent appearance and quality. The main process of the manufacturing method of this invention is: various compositions which represent the printing paper surface layer, the foamed intermediate layer, and the in-mold label-adhered layer respectively are co-extruded, by using two secondary extruders and one primary extruder, through one T-type die to form a 3-layer resin composition; then, through procedures of cooling/forming, biaxial orientation, corona discharge treatment, and laminating/rolling, a 3-layer co-extruded biaxial-oriented pearly synthetic paper label used for integrally molding with bottle in mold is obtained. This invention, of which the manufacturing process is simple and the cost is low, completely breaks through and fully improves the complicated process of conventional methods wherein the plastic film or a synthetic paper is either coated with a heat-melted adhesive or fabricated to be an in-mold label-adhered layer after being embossed; thus, this invention is of industrial applicability to the PP bottle or the HDPE bottle manufacturing industry.
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