公开(公告)号：US3624025A

公开(公告)日：1971-11-30

申请号：US3624025D

申请日：1969-09-03

Applicant: BRITISH INSULATED CALLENDERS

Inventor： TWIST REGINALD JAMES

IPC: B29C47/10 ,  B29C47/92 ,  G05D5/03 ,  B29F3/06 ,  B29F3/10

CPC classification number: B29C47/92 ,  B29C47/0014 ,  B29C47/1036 ,  B29C2947/92085 ,  B29C2947/92104 ,  B29C2947/92142 ,  B29C2947/92161 ,  B29C2947/9218 ,  B29C2947/9219 ,  B29C2947/92438 ,  B29C2947/9258 ,  B29C2947/9259 ,  B29C2947/926 ,  B29C2947/92609 ,  B29C2947/92685 ,  B29C2947/92847 ,  B29C2947/92876 ,  B29C2947/92933 ,  B29C2947/92961 ,  G05D5/03

Abstract: The operation of an extrusion machine is controlled to obtain a constant cross section in the extrudate without the need to make measurements upon it. The machine is fed by a controlled feeding device which discharges into a reservoir that has a capacity sufficient to ensure that the machine is choke fed, and the reservoir is provided with means, such as a narrow neck, to amplify variations in the level so that unacceptable changes are immediately indicated. Signals representing a rate of feed to the reservoir and the line speed are obtained and the relationship between the feed rate and the speed of the machine and between the feed rate and the line speed are adjusted respectively to maintain a constant level in the reservoir and to establish a constant relationship so that the rate of extrusion of material is kept constant.