subject: advantages of pp woven bag [print this page] advantages of pp woven bag advantages of pp woven bag
Various kinds of waste material which have to be disposed of can comprise fluids and objects with corners or relatively sharp edges. If such waste material is put in a waste bag, there is a risk that the corners or relatively shaped edges will puncture the wall of the bag, and that the fluids may then leak out.
One particularly dangerous situation in which waste is disposed of in bags arises in hospitals. Clinical waste is often disposed of along with relatively hard surgical or clinical articles. The risk of a leak of blood from such a bag is particularly dangerous, as the blood may be contaminated with the hepatitis or HIV virus. Infection has already been known to occur in this way, particularly during perfusion after which pipe fittings, intercoolers, and oxygenaters containing up to half a liter of blood are dropped into a waste bag which is then gathered at its top and sealed with wire, tape, or other tie. Up to twelve bags have been placed one inside the other hitherto, to reduce the risk of a tear occurring.
The present invention aims to reduce the liklihood of a tear occurring in the disposal of waste material in a pp woven bag, preferably so as to reduce the hazard of infection from contaminated blood in the disposal of clinical waste, whilst providing a bag which is as readily loaded and tied as a conventional waste bag.
Accordingly the present invention is directed to a waste bag made of a synthetic plastics material and having an internal lining of a liquid-absorbent material which terminates inwardly of the mouth of the bag, so that the latter is free of lining in the region of its mouth to enable that region to be gathered and tied.
Such a waste pp woven bag may comprise a co-extruded triple laminate of polyamide sandwiched between polyethylene. This combines the advantages of a polyamide, for example nylon, which is a good gas barrier and therefore prevents odours escaping the bag, and polyethylene, which is readily heat sealed to itself and to the lining. A cheaper laminate would be a twin laminate, comprising a layer of polyamide and a layer of polyethylene, in which case the polyethylene would be arranged on the inside, against the lining, so that its heat sealing properties can be used effectively. The lining may comprise a non woven material, for example a non woven polyamide.
A second aspect of the present invention is directed to a waste bag made of a co-extruded triple laminate comprising a polyamide sandwiched between polyethylene, in which the polyamide constitutes a proportion substantially in the range from 15% to 25% of the laminate by weight and in which the laminate has a thickness substantially in the range from 80 to 120 microns. Such a bag provides the advantage of sufficient strength against tearing with sufficient pliability to enable the top of the bag to be gathered into a neck portion and held by a tape, wire, or other tie without the flutes so formed providing any passageways through which blood or other fluid can seep out by gravitational flow, capillary flow, or by wick action.
A third aspect of the present invention is directed to a waste pp woven bag having a lining which is doubled back on itself at the bottom of the bag so that the lining is continuous thereat.
This affords the advantage that a good resistance to tearing is formed at the bottom of the bag when a heavy or sharp object is dropped into it.
