Transmission Efficiency of plastic Films Part 1

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TRANSMISSION EFFICIENCY OF PLASTIC FILMS One interesting example of the use of a coextruded high barrier film is that of the packaging of shredded coconut from Sri Lanka. The product was previously being tainted in transit by other aromatic materials stored in the boat. The answer was found in the use of 5-ply Kraft paper sacks lined with a heat sealed co extrusion based Of EVOH. 3.3 AGRICULTURE USE: Water Conservation: Plastics films provide a cheap method of conserving water supplies. One widespread use is the making of temporary reservoirs, using black plastics film of about 25µm thickness as a lining on the soil surface of suitable excavations. After bulldozing the soil to a suitable depth the film is laid, preferably on a sand layer in case the soil contains stones liable to puncture the film. Enough film is laid to extend over the sides of the reservoir so that weeds are prevented from growing at the water’s edge. The cost of such a reservoir is very much less than that of a cement lined one, the cost ratio is roughly in a ratio of one cement to ten film, based on a capacity of around 65 0001(14 300 gallons). Large capacities are possible and in Canada two lagoons have been constructed with capacities of 27 million liters (6 million gallons) each. The question of seepage has been investigated and in the U.S.A. it has been shown that even film of only 150µm thickness gives complete protection against seepage for over five years. An even more striking use of polyethylene film in water conservation has been developed in the Sahara where the land is first excavated, then lined with film. Before the earth is replaced, perforated plastic pipes are placed near the base of the excavation. When the soil is replaced and plants have been placed in position, water is pumped through the perforated pipes at low pressure. The roots of the plants are attracted downward to the water and it has been shown that less water is required for plant growth using this method than if conventional irrigation methods were used. REARING OF LIVESTOCK A sheep house has been constructed from 250µm polyethylene film sandwiched between two layers of nylon netting, spread over tubular steel arches. The sheep house is in Wales and is situated on an exposed hillside. The structure houses 150 sheep and cost only one eighth of the cost of a permanent sheep house. A minor but interesting use of plastics film is in an automatic battery chicken system where the conveyor belts for transporting food and removing eggs and hen droppings are made from poly ethylene terephthalate (PET) film. Another aid to animal husbandry is the use in Australia of polyethylene film coats which are fitted to newly sheared sheep to cut down deaths from cold. 40
3.4 BUILDINGS: TRANSMISSION EFFICIENCY OF PLASTIC FILMS Some uses for buildings have already been mentioned before. Polyethylene film, for instance, with polypropylene or nylon netting support has been used in temporary roofing and walling for a number of farm buildings. Temporary shelters have also been constructed with the same material. NEW BARRIER TUB IS IDEAL FOR OLIVES Portuguese olive producer Maçarico S.A. has chosen RPC Bebo Nederland`s latest tub for the ideal presentation and preservation of its new product range. RPC Bebo Nederland`s range of 115mm barrier tubs has proved highly successful across a number of markets. The recent introduction of a 350ml capacity size is aimed directly at the olive market, for which this is a standard size and a regular sight in supermarkets across Portugal and other countries. When Maçarico introduced a new product range of olives which are marinated in olive oil with aromatic herbs, the company recognized that the new RPC tub was ideal for its requirements. “We wanted something that combined functionality, in terms of barrier protection, with an attractive appearance, and RPC had the perfect solution,” comments the Quality Control representative of Maçarico S.A. Thermoformed in transparent PP/EVOH/PP to enable consumers to see the products, the tub is suitable for pasteurization. “This new size extends the proven qualities of our 115mm PP/EVOH/PP range, and we feel confident that food companies worldwide will follow Maçarico`s example by selecting it as a high-quality packaging solution,” comments Dirk Wasser of RPC Bebo Nederland. 41
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