Deformation correcting method, cutting method, deformation correcting apparatus and cutting apparatus for sheet materials

A sheet material deformation correcting method for decurl a rolled sheet material by lapping said rolled sheet material on the circumference of a heating roller, comprising the steps of:

• presetting a heating temperature of said heating roller on the basis of the sheet material information including the quality of said rolled sheet material;
• detecting curl amount of said rolled sheet material;
• setting a lapping time, for which said rolled sheet material is lapped on the circumference of said heating roller, in a manner to correspond to said detected curl amount;
• and
• lapping said rolled sheet material on the circumference of said heating roller for said set lapping time, while said heating roller being kept at said heating temperature.

A sheet material deformation correcting method for correcting the deformation of a polymer sheet material formed in a roll, to flatten said polymer sheet material, comprising the steps of:

• setting deformation correcting heating conditions including the heating temperature and the heating time of said polymer sheet material, on the basis of the kind of said polymer sheet material;
• calculating the deformed position of said polymer sheet material on the basis of the deformation position information and the remainder information of said polymer sheet material;
• and
• subjecting said polymer sheet material to a heating treatment on the basis of said deformation correcting heating conditions when said deformed position calculated reaches the deformation correcting position.

A sheet material deformation correcting apparatus for decurl a rolled sheet material by lapping said rolled sheet material on the circumference of a heating roller, comprising:

• heating temperature setting means for setting the heating temperature of said heating roller in advance on the basis of sheet material information including the material of said rolled sheet material;
• curl amount detecting means for detecting curl amount of said rolled sheet material;
• heating time setting means for setting the lapping time for which said rolled sheet material is lapped on the circumference of said heating roller, in accordance with said detected curl amount;
• and
• lapping means for lapping said rolled sheet material on the circumference of said heating roller for said set lapping time while said heating roller being kept at said heating temperature.

A sheet material deformation correcting apparatus for decurl a recording medium having a polymer support, comprising:

• heating means for subjecting a recording medium to a heating treatment by contacting said sheet material with said heating means;
• heating condition determining means for setting heating conditions including the heating temperature and the heating time of said recording medium in advance on the basis of the kind of said recording medium;
• heating temperature control means for controlling the temperature of said heating means as said heating temperature;
• and
• heating time control means for controlling the time of said heating treatment as said heating time.

A sheet material deformation correcting apparatus for correcting the deformation of a rolled polymer sheet material to flatten said polymer sheet material, comprising:

• heating means for subjecting said polymer sheet material to a heating treatment by contacting said polymer sheet material with said heating means;
• heating condition determining means for setting deformation correcting heating conditions including the heating temperature and the heating time of said polymer sheet material, on the basis of the kind of said polymer sheet material;
• and
• deformed position operating means for calculating the deformed position of said polymer sheet material on the basis of the deformed position information and the remainder information of said polymer sheet material.

A sheet material deformation correcting apparatus for decurl a sheet material by bringing said sheet material into contact with heating means kept at a constant temperature, comprising:

• line velocity detecting means for detecting the transfer velocity of said sheet material;
• support means for bringing said sheet material into contact over a predetermined length with said heating means;
• position detecting means for detecting the position of said support means;
• and
• control means for driving/controlling said support means in accordance with the change in the transfer velocity of said sheet material, when the transfer velocity of said sheet material changes, so that the length of said sheet material to contact with said heating means may be changed to control the time for said sheet material to contact with said heating means, to a constant value.