Resin molded sheet and production method of resin molded sheet, and shaped article and production method of shaped article

A production method of a resin molded sheet, comprising the steps of:

• forming a first thermal expansion layer containing a thermally expandable material on a first surface of a base material made of resin;
• and
• forming a second thermal expansion layer containing a thermally expandable material on a second surface of the base material;
• wherein, in the forming a first thermal expansion layer, at least the first thermal expansion layer is formed in a first region, where the base material is deformed by the first thermal expansion layer, on the first surface of the base material, and
• in the forming a second thermal expansion layer, at least the second thermal expansion layer is formed in a second region, where the base material is deformed by the second thermal expansion layer, on the second surface of the base material.

A shaped article, comprising:

• a base material made of resin;
• a first thermal expansion layer containing a thermally expandable material, and provided on a first surface of the base material;
• a second thermal expansion layer containing a thermally expandable material, and provided on a second surface of the base material;
• a first heat conversion layer provided on the first thermal expansion layer, that is, in a first region where the base material is deformed using the first thermal expansion layer, and the first heat conversion layer containing an electromagnetic wave heat conversion material that converts electromagnetic waves into heat;
• and
• a second heat conversion layer provided on the second thermal expansion layer, that is, in a second region where the base material is deformed using the second thermal expansion layer, and the second heat conversion layer containing an electromagnetic wave heat conversion material that converts electromagnetic waves into heat,
• wherein, in the first region, the first thermal expansion layer is raised due to expansion, and the base material is deformed following the first thermal expansion layer, and
• in the second region, the second thermal expansion layer is raised due to expansion, and the base material is deformed following the second thermal expansion layer.

A production method of a shaped article, using a resin molded sheet provided with a base material made of resin, a first thermal expansion layer containing a thermally expandable material and provided on a first surface of the base material, and the second thermal expansion layer containing a thermally expandable material and provided on a second surface of the base material, the production method comprising the steps of:

• forming a first heat conversion layer for converting electromagnetic waves into heat on the first thermal expansion layer, that is, on a first region where the base material is deformed using the first thermal expansion layer;
• forming a second heat conversion layer for converting electromagnetic waves into heat on the second thermal expansion layer, that is, on a second region where the base material is deformed using the second thermal expansion layer,
• irradiating the first heat conversion layer with electromagnetic waves to expand the first thermal expansion layer and deform the base material in the first region;
• and
• irradiating the second heat conversion layer with electromagnetic waves to expand the second thermal expansion layer and deform the base material in the second region.