Apparatus for the preparation of a cylindrical corrugated article

An apparatus for manufacturing a cylindrical corrugated article, comprising:

• 1. forming means comprising a pair of rotatable rolls, namely first and second forming rolls, which are rotatable in opposite directions, said rolls having interlocking corrugated surfaces, a heating member provided inside at least one of said rolls, and the corrugated surface of the first forming roll being provided with grooves formed in the circumferential direction thereof;
• 2. supply means for supplying a sheet material between said pair of rolls to cause corrugation of the sheet material by pressing it with the corrugated surfaces of said first and second forming rolls as they rotate to form a corrugated cylindrical article;
• 3. means for rotating said rolls when the corrugated surfaces are interlocking;
• 4. guide means for preventing the corrugated article resulting from the corrugation of the sheet material from coiling around the first forming roll and for causing the corrugated article to coil around the circumference of the second forming roll, said guide means including ringlike guide plates which surround the circumference of the second forming roll and are slightly spaced therefrom so that the corrugated article coils around the second forming roll within the ringlike guide plates, said guide plates having fore ends disposed within the grooves of the first forming roll and facing in a direction which is opposite to the direction of rotation of said first roll so that said plates prevent the corrugated article from coiling around the first roll;
• 5. means for disengaging said second forming roll with the corrugated article mounted thereon from said first forming roll;
• and
• 6. means for discharging the corrugated article from the second forming roll after it has been disengaged from the first forming roll.