Abstract:
The invention aims to provide a polylactic acid based resin sheet that is high in antistatic property, transparency, and blocking resistance, and suitable particularly for production of printable moldings. [Solution] A polylactic acid based resin sheet including a layer formed of a composition (D) containing polylactic acid (A), an ionic surface active agent (B), and a nonionic surface active agent (C), wherein the polylactic acid (A) has a content of 50 mass% or more and 99.5 mass% or less in the entire 100 mass% of the composition (D), and the mass ratio between the ionic surface active agent (B) and the nonionic surface active agent (C) meets the relation 2 ‰¤ (B)/(C) ‰¤ 20.
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.
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.
Abstract:
PURPOSE: To provide a manufacturing device for a thermoplastic resin sheet employing a silicone resin covered roll which can generate no surface defect losing the quality of a thermoplastic resin sheet and can be used for a long time under a high temperature. CONSTITUTION: In a device for heating, drawing or heat-treating a thermoplastic resin sheet with a roll, the roll is a heating roll which is provided with a press mechanism and covers, together with heating, its surface with a silicone resin, which is then subject to oxidation inhibition treatment.
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.