Nec Corporation

Yokogawa Electric Corporation

Takao Maruyama

Takashi Sasaki

Kenichiro Yahiro

Kenji Takao

Kazuhiko Yamada

Hirofumi Shimizu

Takahiro Ishizaki

Yoshitatsu Mori

The present invention is characterized in that in a simulation for predicting a steam pressure setpoint after grade change, an initial moisture percentage is evaluated from differences between bone-dry basis weights and between machine speeds before and after grade change; the bone-dry coated weight of a size is evaluated from the flow rate and concentration thereof; and then the dryer inlet moisture percentage of a web after a size press is calculated from the coated weight. Thus, the invention intends to improve the quality of products through precise dryer control, as well as reduce the time required for grade change, by precisely predicting the web's initial moisture percentage at the dryer inlet after grade change and precisely and quickly controlling dryer steam pressure during grade change.

Method of paper machine control and apparatus for the method

A method and apparatus for manipulating dryer steam pressure in a paper machine during grade change, wherein change in moisture percentage is determined from a change in production amount during grade change, dryer stream pressure is manipulated so as to cancel the change in the moisture percentage, and production amount during grade change is calculated from basis weight and machine speed before and after grade change, whereby moisture percentage is kept constant during grade chagne so that sheet breaks are avoided and downtime is reduced.

Method of manipulating dryer steam pressure in paper machine during grade change and apparatus for the method

The present invention relates to improvement in a method for estimating a setting value of a dryer steam pressure after papermaking exchange according to simulation in a papermaking machine and an apparatus therefor, where a steam pressure setting value after papermaking exchange is estimated accurately by determining an in-hood air dry-bulb temperature on the basis of a difference between an in-drum steam temperature which has been just measured and an initial value of an in-drum steam temperature, thereby reducing a papermaking exchange time as well as reducing broke and improving the rate of operation.

Method for estimating dryer vapor pressure in papermaking machine and apparatus therefor

In a combined thin film magnetic head comprising reading and recording parts which are formed on a main surface of a non-magnetic substrate for magnetically reading and recording information on a magnetic recording medium, the reading part comprises an under shield pattern, an upper shield pattern, and a magneto-resistive element formed between the under and the upper shield patterns. The under and the upper shield patterns have restricted areas which are much smaller than the main surface of the non-magnetic substrate. The recording part comprises a conductor member with a coil pattern. An outer periphery portion of the coil pattern is out of a forming area which is for forming the reading part.

MR/inductive combined thin film magnetic head capable of reducing

A circuit for driving a dual-element magnetic head assembly made up of a magnetoresistive (MR) readback head and a recording head for recording and reproducing data out of a magnetic recording medium. When the head assembly ends a recording operation, the last recording magnetic field is oriented in a direction for deepening the bias to a MR element at all times. A bias electric field for the MR element is continuously applied even during recording operation. The circuit, therefore, stabilizes the bias to the MR element at the end of a recording operation, reduces noise during readback operation, and prevents the readback output from fluctuating every time a recording operation is performed.

Drive circuit for a dual-element magnetic head assembly which includes

In a magnetic transducer assembly for magnetic recording disks, a magnetic slider body has two laterally spaced apart longitudinal rails each having a floating surface and a groove formed between them. A thin-film magnetic core assembly is mounted on an end wall of each of the rails and a magnetic gap is formed on each floating surface. A suspension element has one end secured to the bottom surface of the groove for maintaining the slider assembly in a constant position with respect to the surface of the disk. Preferably, the longitudinal rails are bridged bya laterally extending block to create negative pressure between the rails by relative movement between the assembly and the surface of the disk, and the suspension element exerts pressure in a direction away from the surface of the disk.

Low profile magnetic transducer assembly with negative pressure slider

A magnetoresistive playback head for a small magnetic disk. Electrodes connected to an MR element each has a linear portion extending over a length which is more than ten times greater than the width of the MR element. The electrodes each extends from the MR element at an angle less than 14 degrees. This allows only a single magnetic domain to exist in the MR element and frees the magneto-resistive response from distortions or hysteresis. As a result, signals reproduced from a magnetic recording medium do not include any distortion or noise.

Magnetoresistive head having electrodes with a predetermined length and

A thin film magnetic head has a layer of soft magnetic material formed on a substrate. The layer is formed into two yoke pieces and a magnetic return path, which form a gap at ends of the yoke pieces. The opposite ends of the yoke pieces are joined to the magnetic return path by overlaying magneto-resistive pieces to which an electrical bias is applied.

Thin film magnetic head

A thin film magnetic head comprises a magnetic gap spacer layer interposed between two soft magnetic members at least one of which is formed in a thin film form. The magnetic gap spacer layer is made of a thermally decomposed polymer of a metallic compound represented by the formula, M(OR1)m(R2)n-m, where M is a metallic element selected from metals and metalloids which are elements intermediate in properties between the typical metals and non-metals, R1 being one selected from hydrogen and an alkyle group, R2 being an alkyle group, n being a valence of the metallic element, and m being an integer equal to or less than n. Typical ones of the metallic compound are tetraisopropyl titanate, tetranormalbutyl titanate, tetraalkoxysilane, organosilanol, and aluminum isopropylate. The metallic compound is solved in an organic solvent and is coated on a surface to be formed with the magnetic gap spacer. The coating is heat-treated at a lower temperature to thereby form the polymer. The polymer serves as an adhesive layer for adhering the two magnetic members.

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Tokyo, Japan

Takao Maruyama