Abstract: A sheet or film-forming roll 10 includes an inner cylinder member 20 having axial parts 21, 22 provided on both sides thereof and rotatably supported by bearing parts 26, 27 through the axial parts 21, 22, a rubber roll 40 fitted to an outer circumferential surface of the inner cylinder member 20, eccentric side plates 53, 54 rotatably fitted to the axial parts 21, 22 of the inner cylinder member 20 respectively, and an elastic outer cylinder member 50 rotatably supported by the eccentric side plates 53, 54. The elastic outer cylinder member 50, which is provided with a thin-walled structure and made from metal, has an inner diameter larger than an outer diameter of the rubber roll 40 to accommodate the rubber roll 40 in an interior 68 thereof, and has inner circumferential surface 50A coming into contact with an outer circumferential surface 40A of the rubber roll 40.

Abstract: The present invention enables an automatic roll gap adjustment, thereby facilitating operations at a set-up or when changing forming conditions. Specifically, one embodiment of the present invention controls a sheet take-off speed (a roll rotation speed) in accordance with a deviation of a measurement value from a set value of a roll gap under a constant pressing load control.

Abstract: An sheet forming apparatus selectively uses two control modes: a constant roller gap control mode where a roller gap is controlled by a roller gap adjustment means so that the roller gap converges a predetermined control target value; and a constant pressing load control mode where the roller gap is controlled by the roller adjustment means so that a pressing load converges a predetermined control target value.

Abstract: A first forming roll and a second forming roll are provided parallel and opposite to each other, and a double-surface formed sheet is formed by the first forming roll and the second forming roll.

Abstract: A process for producing an olefin polymer using a catalyst in which (A) is a solid catalyst component which includes magnesium, titanium, halogen and an electron donative compound as essential constituents; (B) is an organoaluminum component; and (C) is at least two electron donative compounds (&agr;) and (&bgr;), wherein the pentad stereoregularity of a xylene insoluble fraction of a homopolyproylene is 0<mmrr/mmmm≦0.0068 when electron donative compound (&agr;) is used in combination with (A) and (B), and the pentad stereoregularity of a xylene insoluble fraction homoproplyene of a is 0.0068<mmrr/mmmm ≦0.0320 when electron donative compound (&bgr;) is used in combination with (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film. (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film.

Abstract: A catalyst system for polymerizing olefins is obtainable from (A) a solid component containing (A) magnesium, titanium and halogen and an electron donative compound which is an ether or ester; (B) an organoaluminum compound, and (C) at least two electron donative compounds, including an (.alpha.) and (.beta.) compound, wherein the total amount (C) compounds is 0.01 to 1 mole per mole of (B).

Abstract: An .alpha.-olefin polymer well balanced between stiffness, stickiness, processability, etc., which intrinsic viscosity [.eta.] is in the range of from 0.5 to 10 and which 20.degree. C. xylene-soluble fraction (CXS) content (% by weight) and 105.degree. C. xylene-insoluble fraction (XIS) content (% by weight) satisfy a condition of XIS.ltoreq.70.00-3.64CXS, provided that CXS is not smaller than 0 and not greater than 15; a specified .alpha.-olefin polymerizing catalyst for producing the polymer; a process for producing the polymer using the specified .alpha.-olefin polymerizing catalyst; a polypropylene for use in the production of a biaxially oriented film excellent in stretchability and satisfying the conditions (1)-(3) mentioned below; and a biaxially oriented film excellent in stiffness and dimensional stability obtained by stretching the polypropylene:(1) the content of 20.degree. C. xylene-soluble fraction (CXS) is 3.5% by weight or less,(2) the content of 20.degree. C.

Abstract: A sheet profile for bank formation is controlled by using a system including a die and two rotational formation rolls arranged substantially to be parallel to each other at a downstream side of the die, in which a plastic material heated and plasticized is fed through a discharge port of the die in shape of sheet to an upstream side of a gap between the two formation rolls and a sheet is formed so as to provide a predetermined sheet profile by passing through the gap between the two rolls under pressure while forming a bank of the plastic material at the upstream side of the roll gap.

Abstract: A novel method of adjusting a heat-displacing T-die is provided wherein a T-die slit gap is adjusted by thermal expansion and contraction of die bolts individually provided with heaters so that a sheet or film material has a target profile in thickness, characterized in that a thickness feed back control loop and a virtual temperature control loop are provided, and in the thickness feed back control loop, data of thickness of products are subjected to a profile treatment to correct a target profile for temperature setting and changing of die bolts so as to define an appropriate slit gap, and in the virtual temperature control loop, an appropriate die bolt temperature is predicted from a control output value of the heater and a radiation temperature to the circumference so as to calculate a corresponding power to be supplied to the heater.

Abstract: The present invention provides a method of control in thickness of the biaxially oriented film of a plastic material to be extruded via an extrusion port gap adjustable by adjustment of a plurality of die bolts provided on an automatic T-die. A position corresponding to the die bolt is set on the film biaxially oriented so that a thickness of the film at the above position is measured to find a deviation of the measured thickness from a reference thickness predetermined to thereby carry out a feed-back control of the adjustment of the die bolt in accordance with the deviation. It is important for the present invention that the feed-back control in the adjustment of the die bolt is carried out with reference to partial side-drawing rates different in a width direction of a sheet to be drawn prior to formation of the film, where the partial sidedrawing rates are determined for parts aligned in the width direction of the film.

Abstract: An adaptor for a fiber optic connector of the type which utilizes a split sleeve to align ferrules from oppositely facing connectors. The sleeve has a longitudinal slit and the ferrules receive the optical fiber. A tubularly shaped elastic body is installed around the outer periphery of the split sleeve, the body applying a spring force to the periphery of the split sleeve.