Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1976-06-24
1979-09-04
Coan, James F.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
93 33H, 156514, B31B 184
Patent
active
041664124
ABSTRACT:
A method is disclosed for the continuous manufacture under sterile or at least non-pyrogenous conditions of plastic bags provided with connecting nipples to be used for the storage of blood plasma or serum, milk and other vulnerable liquids.
For the welding of connecting nipples to the outer wall of the bag a counter-electrode is employed and is inserted into the bag's interior. Normally the plastic bags are formed out of an extruded plastic tube after it has been flattened and coiled to a spool.
The present method starts from a wider flat tube than that used in the prior art and which has a width equal to the length dimension of the bag to be made so the bag is open at its sides. A counter electrode formed as a sliding-block is located in the interior of the tube whose leading end is closed now. The sliding-block is displaced in a direction towards the spool and each time that the welding of the connecting nipples onto a given bag is completed, the sliding-block is passed to the next bag to be treated. The bag just treated is then closed along its sides so that sterile conditions can be maintained. Piercing through said wall portion of the bag can be deferred till the bag is actually taken in use. However, piercing can also be done during manufacture by means of a sharp-pointed needle or plunger being slidable in a bore within the sliding-block. The nipple can have virtually any shape. The most simple form is a length of narrow hose which is to be shut off by a clip. In another form the nipple is of the flange type with the flange serving as a seat for a droplet counter, for instance.
REFERENCES:
patent: 3215048 (1965-11-01), Torchio in Gattrugeri
patent: 3244576 (1966-04-01), Swartz
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