TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Method: The process is optionally carried out at specific interval of time. Alternately, the used paper and waste plastic supplied from feed conveyors (I and II) are crushed together. Material of the mixture is detected by material detector (I) by irradiating with near-infrared rays and each heat energy released is calculated by multiplying the heat energy released into the material with the number of crushed used paper pieces and crushed waste plastic pieces in the mixture. The ratio of feed rate of used paper and waste plastic from conveyors (I and II) is controlled corresponding to the desired heat energy released based on the calculated value and the mixture from the feeder is molded. Chlorine content of the crushed used paper piece and waste plastic crushed pieces are separately calculated, or chlorine content of the mixture is calculated while detecting the material of the crushed pieces. The temperature of extrusion molding is measured, and feed rate of used paper crushed piece and waste plastic crushed pieces is controlled such that the compaction temperature attains a required value. Moisture content of extrusion molding is measured and moisture content of the mixture is controlled such that the moisture content of molded product attains a required value.Preferred Apparatus: The manufacturing equipment has feed conveyors (I and II) for supplying used paper and waste plastic, respectively, and crushers (I and II) for crushing used paper and waste plastic, respectively. The manufacturing equipment further has material detectors (13A and 13B) for detecting the material of used paper crushed pieces from feeder (10A) and waste plastic crushed pieces from feeder (10B), respectively, chlorine content calculating units (I and II) for calculating chlorine content of used paper crushed pieces based on detected result of detector (13A) and waste plastic crushed pieces based on detected result of detector (13B), respectively. Alternately, the manufacturing equipment further has material detector (II) for detecting material of mixture form the feeder, chlorine content calculating unit for calculating chlorine content of the mixture based on detected result of detector (II). The manufacturing equipment further has thermometer (15) for measuring temperature of molding machine, moisture content measurement unit (22) for measuring moisture content of molded product, water-sprinkling amount variable sprinkler system (16) for sprinkling water into molding machine, water sprinkling amount control unit for controlling water sprinkling amount of the sprinkler such that moisture content of molded product attains required value based on the measurement result of moisture content measurement unit.