| abstract |
The present invention relates to an image forming apparatus, comprising: a lower layer sequentially from a lower portion to an upper portion; A base layer; A printing layer; And a transparent layer, wherein the at least one layer comprises a polyvinyl acetal resin. In addition, the present invention provides a semiconductor device comprising: a lower layer; A base layer; A printing layer; In the production of a flame-retardant flooring comprising a clear layer, (1) a lower layer preparation step of preparing a lower layer with a composition comprising 100 parts by weight of a polyvinyl acetal resin and 100-400 parts by weight of a filler; (2) a base layer preparation step of producing a base layer composed of glass fiber impregnated with a PVC sol; (3) a printing step of printing on the base layer or forming a print layer by laminating a film or a sheet on which a printed pattern is printed; (4) preparing a transparent layer composed of a transparent PVC film or a PET film; (5) a laminating step of laminating a base layer having a print layer formed thereon between a lower layer and a transparent layer. |