Double-sided coating apparatus and double-sided coating method

A double-sided coating apparatus that coats a coating region on both sides of a raw material having the coating region and a non-coating region and formed in a sheet shape with a coating liquid, comprising:

• a pair of transport rollers that nips the raw material and delivers the raw material in a predetermined delivery direction;
• a first coating head arranged downstream of the pair of transport rollers in the delivery direction of the raw material and arranged on one side of the raw material to coat the raw material with the coating liquid by alternately forming a first coating region and a first non-coating region in a direction perpendicular to the delivery direction;
• a second coating head arranged downstream of the pair of transport rollers in the delivery direction of the raw material and arranged on the other side of the raw material to coat the raw material with the coating liquid by alternately forming a second coating region and a second non-coating region in the direction perpendicular to the delivery direction;
• a drying apparatus downstream of the first coating head and the second coating head in the delivery direction of the raw material;
• a first coating roller provided between the first coating head and the second coating head, and the drying apparatus and having a large-diameter portion and a small-diameter portion with different diameters along an axial direction with the small-diameter portion opposite to the first coating region and the large-diameter portion opposite to the first non-coating region;
• and
• a second coating roller arranged opposite to the first coating roller and having the large-diameter portion and the small-diameter portion with different diameters along the axial direction with the small-diameter portion opposite to the second coating region and the large-diameter portion opposite to the second non-coating region to nip the raw material together with the first coating roller and also to deliver the raw material to the drying apparatus.

A double-sided coating method of coating a coating region on both sides of a raw material having the coating region and a non-coating region and formed in a sheet shape with a coating liquid, comprising:

• transporting the raw material;
• coating the raw material with the coating liquid by alternately forming a coating region and a non-coating region in a direction perpendicular to the delivery direction by a first coating head arranged on one side of the raw material;
• coating the raw material with the coating liquid by alternately forming the coating region and the non-coating region in the direction perpendicular to the delivery direction by a second coating head arranged on the other side of the raw material;
• and
• transporting the raw material by pressing both sides of the raw material by a coating roller arranged on the one side of the raw material and near an opposite position across the raw material from the second coating head and having a large-diameter portion and a small-diameter portion with different diameters along an axial direction with the small-diameter portion opposite to the coating region and the large-diameter portion opposite to the non-coating region.

A double-sided coating method of coating a coating region on both sides of a raw material having the coating region and a non-coating region and formed in a sheet shape with a coating liquid, comprising:

• nipping the raw material and delivering the raw material in a predetermined delivery direction by a pair of transport rolls;
• coating the raw material with the coating liquid by alternately forming a first coating region and a first non-coating region in a direction perpendicular to the delivery direction by a first coating head arranged downstream of the pair of transport rollers in the delivery direction of the raw material and arranged on one side of the raw material;
• coating the raw material with the coating liquid by alternately forming a second coating region and a second non-coating region in the direction perpendicular to the delivery direction by a second coating head arranged downstream of the pair of transport rollers in the delivery direction of the raw material and arranged on the other side of the raw material;
• transporting the raw material by pressing both sides of the raw material by a first coating roller provided between the first coating head and the second coating head, and a drying apparatus and having a large-diameter portion and a small-diameter portion with different diameters along an axial direction with the small-diameter portion opposite to the first coating region and the large-diameter portion opposite to the first non-coating region and a second coating roller arranged opposite to the first coating roller and having the large-diameter portion and the small-diameter portion with different diameters along the axial direction with the small-diameter portion opposite to the second coating region and the large-diameter portion opposite to the second non-coating region to nip the raw material together with the first coating roller and also to deliver the raw material to the drying apparatus;
• and
• drying the raw material downstream of the first coating head and the second coating head in the delivery direction of the raw material.