PREPARATION OF THERMOPLASTIC POLYMER SHEET

    公开(公告)号:JPS62144922A

    公开(公告)日:1987-06-29

    申请号:JP28427985

    申请日:1985-12-19

    Abstract: PURPOSE:To reduce gas consumption and achieve a high preparation speed by means of a better capability of preventing micro discharge by supplying a gas having electric insulating properties higher than that of air into between a block material provided on the upstream side of a contact starting point of a polymer sheet and the contact starting point of polymer sheet. CONSTITUTION:A block material 11 to block the air flow following the surface of movable cooling material 3 is provided on the surface of movable cooling material or over the top of the surface of the movable cooling material where a polymer sheet 2 is not in contact with the surface of movable cooling material 3, and an insulating gas having electric insulating properties higher than that of air is supplied to an area close to the polymer sheet side of the block material. The air flow following the surface of movable cooling material 3 is cut by the block material 11, immediately after which the insulating gas is supplied, and the gas supplied follows the movement of surface of movable cooling material 3 to be sent to the area close to the contact starting point to the movable cooling material of polymer sheet 2 and turn said area into the atmosphere of insulating gas. Said atmosphere of insulating gas controls the phenomenon of discharge in the area to enable the movable cooling material 3 to apply high voltage and strengthen the force of static adhesion.

    MANUFACTURE OF THERMOPLASTIC POLYMER SHEET

    公开(公告)号:JPH0392323A

    公开(公告)日:1991-04-17

    申请号:JP22905789

    申请日:1989-09-04

    Abstract: PURPOSE:To enhance bonding properties of both ends of a polymer sheet with a moving cooling material and increase manufacturing speed by electrifying the polymer sheet melt extruded until bonding with the moving cooling material and spraying fluid from a conductive nozzle. CONSTITUTION:A molten thermoplastic polymer is extruded from an extrusion die 1 onto a moving cooling material 2 in the sheet-like form. An electrode 3 to which high voltage is applied is provided in the vicinity of a contact point of a sheet with the moving cooling material, and the moving cooling material 2 and the sheet are bonded together and quenched by static electricity force. Then, the fluid is sprayed from a nozzle 4 installed in the vicinity of the electrode 3 to both ends of the sheet. The quality of the nozzle is a conductive substance, and the nozzle is developed electrically and high voltage is applied to the nozzle. The quality of the nozzle is a conductive substance, and the nozzle is grounded electrically through high resistance.

    PROCESS FOR WASHING FILTER MEDIUM

    公开(公告)号:JPS60122022A

    公开(公告)日:1985-06-29

    申请号:JP22914283

    申请日:1983-12-06

    Abstract: PURPOSE:To remove polymers fixed to a filter medium maintaining desired degree of regeneration with reduced washing time and cost by performing alkali hydrolysis at high temp. and under high pressure in an alkaline treating liquid contained in a closed vessel. CONSTITUTION:Polymers to be treated are thermoplastic polymers such as polyesters, polyamides, polyimides, etc. As the treating condition, higher temp. of the alkali treating liquid is more preferable because the velocity of alkali hydrolysis is higher, the higher the temp. of the alkali treating liquid and the shorter the treating time. The temp. higher than the boiling point is desirable. Desired high pressure is maintained easily by holding the material in a closed vessel. Usually, NaOH or KOH is used for the alkali treatment. Aq. soln. thereof held at >=10pH is used.

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