摘要:
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.
摘要:
For the purpose of molding a multilayered film/sheet having a highly precise thickness of each layer, movable choker bars (31, 32) are movably arranged in the middle of molten resin channels (111, 112), and a plurality of choker adjustment bolts (35, 36) are arranged at a predetermined pitch in the die width direction. The choker bars with the choker adjustment bolts are moved so as to adjust the gap in a choker portion. Thermal conductors (37, 38) are provided with the respective choker adjustment bolts.
摘要:
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. There are provided: phase adjusting unit configured to move the second forming roll in an axial direction of the second forming roll; an upper formed-shape detector which detects a formed shape of a front surface of the double-surface formed sheet; a lower formed-shape detector which detects a formed shape of a back surface of the double-surface formed sheet; front/back-surface phase difference arithmetic operating unit configured to compare detection signals of the upper and lower formed-shape detectors with each other, calculating a forming phase difference between the formed shapes of the front surface and back surface of the double-surface formed sheet with respect to the axial direction, and outputting a phase difference value signal indicating the forming phase difference; and phase alignment control processing unit configured to receiving the phase difference value signal, and outputting an instruction to the phase adjusting unit so that the forming phase difference can be reduced.
摘要:
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.
摘要:
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.
摘要:
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).
摘要:
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. The determination of the partial side-drawing rates are made together with setting a corresponding position on the sheet to the die bolt.
摘要:
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.
摘要:
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.
摘要:
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.