초록 ▼

A cellulose fiber insulation, a manufacturing method and a plant for practicing the method. Waste paper is pulverized in a hammermill apparatus to provide a quantity of cellulose fiber particles which are air conveyed past a fog-type injection nozzle where the particles are wetted with a solution of

A cellulose fiber insulation, a manufacturing method and a plant for practicing the method. Waste paper is pulverized in a hammermill apparatus to provide a quantity of cellulose fiber particles which are air conveyed past a fog-type injection nozzle where the particles are wetted with a solution of fire and/or pest resistant and corrosion inhibiting chemicals. The wetted particles are thereafter air conveyed away from the nozzle with heated exhaust air from the hammermill apparatus to dry the particles prior to depositing them in a storage bin. The air by which the particles are conveyed may be exhausted through a filter to catch residual particles which may be returned to the storage bin or directly to the process. The sprayed solution may be prepared by a batch process or by counterflow percolation of heated liquid upward through a bed of soluble fire-retardant chemical. The concentration of chemical in the resultant saturated solution may be regulated by a thermostatic control system. The weight ratio of solution to cellulose fiber may be controlled by sensing the flow rate of the cellulose fiber and generating signals to regulate the rate at which the solution is sprayed from the nozzle.

대표청구항 ▼

A process for continuously impregnating an initially dry first chemical agent into a quantity of fibrous, absorbant, particulate material while controlling both the amount and uniformity of the impregnation of the first chemical agent into the particulate material comprising steps of: continuously i

A process for continuously impregnating an initially dry first chemical agent into a quantity of fibrous, absorbant, particulate material while controlling both the amount and uniformity of the impregnation of the first chemical agent into the particulate material comprising steps of: continuously inserting the particulate material into a stream of air flowing in a first flow path for agitating the particles of the material and transporting the particles along the first flow path; generating a first control signal representative of the rate at which the particulate material is inserted into the first flow path; preparing a solution of first chemical agent in a solvent; maintaining a constant concentration of the first chemical agent in the solution; pumping the solution through a spraying device positioned in the first flow path for moistening the particulate material moving along the first flow path; and regulating the rate of pumping the solution through the spraying device in response to the first control signal for providing a rate of flow of said solution through the spraying device in constant proportion to the rate of flow of the particulate material along the first flow path.