Method for collecting industrial vapors and particulate matter

In the manufacture of film or sheet plastic products from plastic resins which are heated and mixed in mixing equipment and are then conveyed by conveyor means to and through a calendaring machine, a method of effectively collecting and removing by-product vapors and particulate matter, comprising:

• positioning hood means over at least a portion of the heat and mixing equipment, the conveying means and the calendaring machine;
• providing walls of an electrically statically charged clear plastic sheet material which are connected to their tops about border portions of the hood means and which depend therefrom, so as to form vapor collecting enclosures for the mixing and heating equipment, the conveying means and the calendaring machine;
• providing duct means extending from the hood means;
• providing fan means connected to the duct means for drawing vapors upwardly from said enclosures, through the hood means and then through the duct means, including controlling the rate of vapor removal by the fan means to in this manner maintain the temperature within the enclosures at the level required for production of a quality final product;
• and
• collecting the particulate matter on said material by electrostatic attraction, and replacing the clear plastic sheet material once it has reached its capacity of collected particulate matter.