JPWO2021145139A5 - - Google Patents

Claims (13)

A drying system for drying a resin material using circulating gas, comprising:
a dehumidifier configured to dehumidify gas into dehumidified gas;
a heater configured to heat the dehumidified gas into a dry gas;
a drying tank configured to contain the resin material and into which the drying gas is blown;
a catalyst tank configured to circulate the exhaust gas from the drying tank and containing a catalyst for decomposing low-molecular-weight impurities derived from the resin material contained in the exhaust gas;
A cooler configured to cool the gas that has passed through the catalyst tank into a cooling gas, wherein the cooling gas is configured to be sent to the dehumidifier for the dehumidification. A drying system comprising and . The resin material is polyester containing polyethylene terephthalate as a main component, or a recycled material thereof,
The temperature of the dry gas is 130-200° C.
A drying system according to claim 1 . Claim 2, further comprising a heater or heat insulator provided in a flow path between the drying tank and the catalyst tank and configured to maintain the exhaust gas at 130-200°C all the way to the catalyst tank. A drying system as described in . A vent system for removing impurities from a molten resin material, comprising:
a melting section having a vent configured to heat and melt the resin material;
a pump configured to depressurize the vent;
a catalyst tank provided in a flow path between the pump and the vent port and containing a catalyst for decomposing low-molecular-weight impurities derived from the resin material and generated as gas from the melted resin material; vent system. The resin material is a resin material containing polyethylene terephthalate as a main component,
The temperature of the molten resin material at the vent port is 280-320° C.,
The pressure at the vent port is 0.01 kPa-4 kPa,
5. The vent system of claim 4 . 6. The vent system according to claim 4, wherein a high temperature, reduced pressure state is maintained from said vent port to at least inside said catalyst tank. 7. The vent system according to any one of claims 4 to 6, further comprising an oxygen supply unit configured to supply oxygen to the catalyst tank while maintaining the reduced pressure state. 8. The vent system of claim 7, wherein the oxygen supply comprises an oxygen generator and a mass flow meter. 9. A venting system according to any one of claims 4 to 8, further comprising a heat exchanger having a recovery tank for liquid recovery and a cold trap provided between the catalyst tank and the pump. the boiling point of the low-molecular-weight impurity at atmospheric pressure is higher than the melting temperature of the resin material,
The temperature and pressure of the molten resin material at the vent port and the pressure at the vent port are controlled at a temperature and pressure at which the resin material is liquid and the low-molecular-weight impurities are gaseous.
5. The vent system of claim 4. a drying system according to any one of claims 1 to 3 ;
11. The vent system according to any one of claims 4 to 10 , configured to use the resin material dried by the drying system;
and an injection molding machine that performs injection molding using the melted resin material. At least one of a gas after passing through the catalyst bath of the drying system and a gas after passing through the catalyst bath of the vent system is introduced into the melting section. Item 12. The manufacturing system according to item 11 . 12. The manufacturing system according to claim 11, wherein the gas is introduced into the melting section after passing through the catalyst bath of the drying system and before reaching the cooler.