Scraping heat exchanger comprising a housing which is formed by a product-treatment cylinder (1), the walls of which can be cooled or heated and in which there is positioned a rotary shaft (18) provided with a drive (19), carriers (33) with scrapers (35) being attached to the rotary shaft (18), which carriers are able to interact with the internal surface of the product cylinder, and means being provided for feeding and discharging a heating or cooling medium to and from the outer surface of the product cylinder (1), and the product cylinder, which has a smooth inner wall, containing, at one of its ends, a product feed and, at its other end, a product discharge. The product cylinder (1) is formed by a seamless extruded pipe and the rotary shaft (18) is guided outwards to the external drive (19) only at one end of the product cylinder (1).
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