Kao Corporation

Eiten Chin

Toshiharu Numata

Nobuyuki Isshiki

Junichi Masukawa

Takeshi Nakajima

Nobunori Ohji

Yutaka Nakama

Toshiki Takeuchi

Sachiko Kokubo

Masayuki Sugawa

A coating apparatus comprises an upstream lip and a downstream lip defining a slot between the two lips through which a coating liquid can be extruded; and a pair of guide rollers disposed on opposite side of the lips for guiding a support to move past the lips such that the coating liquid can be applied thereto, wherein the downstream lip has a coating operation surface facing and curved toward the support and, a curvature k of the curved coating operation surface being given as

Coating apparatus

A first downstream lip 25 and a second downstream lip 26 are formed with coating work surfaces 34, 35 facing a web 21 and making contact with coating liquid 22A, 22B, a ratio h/G between a gap G defined between the downstream end X of the coating work surface of the first downstream lip and the web. A film thickness h of a lower layer coating film 33A which is extruded from a fist slot part 27 located upstream from the first downstream lip, and which has not yet been dried, is set in the following range:

Coating method using extrusion die having predetermined gap

A coating apparatus 10 is disclosed, which comprises a slot 18 and a chamber 17 formed upstream the slot 18 such as to distribute a coating liquid 12 in a coating width direction. The coating liquid is coated such that it is pressed against a web 11 as it is discharged from the slot. The slot gap H of the slot and the slot gap error .DELTA.H in the coating width direction satisfies a relation

Coating Apparatus

A coating apparatus wherein downstream lips have coating work surfaces respectively where a magnetic dispersoid contacts with a web. A coating work surface of a second downstream lip which is positioned downstream with respect to the web feeding direction is set in a position so as to be apart from the web more than a tangential line which extends from a downstream end of a coating work surface of a first downstream lip which is positioned upstream with respect to the web feeding direction.

In an extrusion type coating device 10, an upstream lip 12 of a coating head 11 is provided with a chamfer with a slot side edge B thereof as a start point. A contact line L drawn from the upstream lip 12 to a downstream lip 13 defines an angle .theta. with a line segment OB with respect to a point O of contact between the contact line and the upstream lip 12 such that the angle .theta. is O&lt;.theta.&lt;45 degrees.

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Ichigai-machi, Japan

Eiten Chin