Sumitomo Chemical Company, Limited

Jian Wang

Koichiro Watanabe

Yasutoshi Minemoto

Koji Kashu

Yusuke Kon

Tatsuya Sakamoto

Hirohiko Hasegawa

Shinya Kimura

Noboru Hayakawa

Tatsuya Kataoka

Satoshi Yoneyama

Rikuri Uejima

Hideyuki Hamamura

Takeshi Kawakami

A coating amount is adjusted based on a result of the inspecting step, then the coating amount is not adjusted during a standby period (Wt) which is a time taken to transfer the film from a coating section () to an inspecting section (), and then the coating amount is adjusted based on the result of the inspecting step after the standby period has elapsed. With the configuration, an amount of a coating layer on a film base material is stabilized.

Method for producing functional film, control device, and control method

The separator production method in accordance with an embodiment of the present invention includes a coated article winding off step of winding off, from a core, a separator original sheet which has been taken up in a coated article taking up step of winding the separator original sheet on an outer peripheral surface of the core while oscillating the core in a rotation axis direction, and the core is oscillated in the rotation axis direction in the coated article winding off step.

Method for producing film and method for winding off film

A gravure roll, in which the outside peripheral surface of a metal roll main body has a plurality of oblique line shaped protrusions forming a prescribed angle with the center axis of the roll main body and the coating liquid can be held in a plurality of oblique line shaped recesses formed between each of the plurality of protrusions, is configured such that the roll main body has a diamond-like carbon layer on the entire outer peripheral surface thereof, a head part for each of the plurality of protrusions is cut down, and each of the plurality of protrusions has a trapezoidal cross-sectional shape that becomes gradually narrower in width moving in direction toward the head part. A separator with a uniform weight per unit area can be manufactured wherein the coating liquid is coated onto a base material film using this gravure roll.

Gravure roll, method of fabricating a separator, and separator

A method of film production includes the steps of obtaining defect information including information on the position of a defect (D) in a separator original sheet (), slitting the separator original sheet () to produce a plurality of separators (), and determining, on the basis of the defect information on a single defect (D), that a separator () actually having the defect (D) and another separator () adjacent to the above separator () are defective.

Film production method and film production device

A roll member having an outer circumferential surface in which a plurality of grooves are formed, wherein the plurality of grooves are arranged at an angle relative to a direction parallel to a central axis of the roll member. A coating device for coating a film member with a coating liquid, the coating device comprising the roll member. A separator production device for producing a separator in which a heat-resistant layer is laminated over a substrate. The separator production device comprising the coating device. A secondary battery production device for producing a secondary battery comprising a positive electrode plate, a negative electrode plate, and a pair of separators that sandwich the positive electrode plate or the negative electrode plate therebetween. The secondary battery production device comprising the separator production device.

Roll member, coating device, separator production device, and secondary batter production device

A method for film production includes the steps of obtaining information on the position of a defect (D) in a separator () and providing marks (LA, LB) at the respective positions in the vicinity of the defect (D), the marks indicating the position of the defect.

A separator producing method includes the steps of: winding up, around a core (), a separator () having a defect (D) detected; and providing a defect code (DC) including information on a position of the defect (D) in the longitudinal direction of the separator () on (i) the outermost portion () of the separator (), wound around the core (), or (ii) the core (), around which the separator () is wound.

Production method for separator sheet, production method for separator, separator sheet wound body, and separator sheet production device

As a laminated porous film realizing excellent handling properties in a low-humidity environment, a laminated porous film in which a layer containing a polymer is laminated on at least one side of a polyolefin porous film, satisfying the following (1) and (2) is provided. (1) When the laminated porous film cut into a rectangle having a length on a side parallel with a machine direction of 60 mm, and a length on a side parallel with the direction perpendicular to the machine direction of 40 mm is left still for 1 hour in an environment at a temperature of 23&#xb0; C. and a humidity of 50%, a lifting amount of the side parallel with the direction perpendicular to the machine direction is 8 mm or more. (2) When the laminated porous film cut into a rectangle having a length on a side parallel with a machine direction of 60 mm, and a length on a side parallel with the direction perpendicular to the machine direction of 40 mm is left still for 1 hour in an environment at a temperature of 23&#xb0; C. and a humidity of 5%, a lifting amount of the side parallel with the machine direction is 12 mm or less.

Laminated porous film, non-aqueous electrolyte secondary battery separator, and non-aqueous electrolyte secondary battery

Provided is a multi-layered porous film which includes a functional layer having a controlled thickness in a length-wise direction thereof and which is suitable as a separator for batteries. The multi-layered porous film includes a base film, and a functional layer containing both an inorganic filler and a binder resin, the functional layer being formed on the base film, wherein a difference between a maximum basis weight and a minimum basis weight of the multi-layered porous film in a length-wise direction thereof is equal to or smaller than 2 grams/m, the basis weight being measured every 100 meters interval. The separator fabricated by cutting a film roll comprised of a multi-layered porous film into pieces each having a given length has small lot-based fluctuation in quality, and makes it possible to fabricate a battery having a small fluctuation in quality.

Multi-layered porous film and nonaqueous-electrolyte secondary battery

As a laminated porous film realizing excellent handling properties in a low-humidity environment, a laminated porous film in which a layer containing a polymer is laminated on at least one side of a polyolefin porous film, satisfying the following (1) and (2) is provided. (1) When the laminated porous film has left still for 1 hour in an environment at a temperature of 23&#xb0; C. and a humidity of 50%, a lifting amount of the side parallel with the direction perpendicular to the machine direction is 8 mm or more. (2) When the laminated porous film has left still for 1 hour in an environment at a temperature of 23&#xb0; C. and a humidity of 5%, a lifting amount of the side parallel with the machine direction is 15 mm or less.

A method for producing a functional film is provided. In the method, a film is sequentially transferred through processing devices including a film inspection device. At least one expander roll is used for film transfer from a processing device to the film inspection device next to the processing device.

Method for producing separator film

An object of the present invention is to provide a laminated porous film excellent in handling ability. A laminated porous film having a layer containing a polymer other than a polyolefin laminated on at least one surface of a polyolefin porous film, wherein the uplift quantity of a side perpendicular to the machine direction, when allowed to stand still for 1 hour under an environment of a temperature of 23&#xb0; C. and a humidity of 50%, is 15 mm or less.

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Daegu, South Korea

Jian Wang