Envelopes – wrappers – and paperboard boxes – Molded or pressed container
Patent
1997-03-25
1998-10-06
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Molded or pressed container
220468, 229407, 264154, 264155, B65D 134, B65D 140
Patent
active
058164880
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tray for packaging food and in particular to a tray for packaging foods prone to dripping exudates, such as meat, fish, salads and the like.
Foods such as meat and fish are commonly packaged, especially for supermarkets, in moulded expanded polystyrene trays covered with shrink wrap film. Because foods such as meat and fish produce an exudate or liquor (such as blood) it is common to put an absorbent pad on the tray immediately below the product to absorb excess liquor. However, the continuing presence of a pad soaked in a liquor such as blood adjacent the product can constitute a health hazard. Moreover, expanded polystyrene does not lend itself easily to recycling.
In an alternative form of tray more recently proposed, an absorbent pad is sandwiched between two sheets of polystyrene in the tray bottom, the upper sheet having holes to allow the liquor through to the pad. This has the advantage that the pad is kept out of contact with the product, but this form of tray is very expensive to produce and still suffers from the disadvantage that expanded polystyrene is not easily recyclable.
The invention seeks to provide a form of tray for use with meat and fish improved in the above respects.
According to the present invention there is provided a packaging tray for use with food such as meat or fish formed from a hollow plastics material board, the base portion of the tray having holes formed in the upper portion thereof and the holes having a lip which is at least partly removed on the top side.
Preferably, the trays are formed from corrugated plastics material sheet such as that described in European patent publication number 0 339 593, and is made of a recyclable material such as polyolefin. The sheet will be moulded into the form of a tray suitable for carrying the relevant product and may in many respects be similar in shape to the current polystyrene trays for meat and fish products. The holes formed in the upper surface of the bottom of the tray will give access to the interior of the hollow sheet or board Forming the holes by means such as a hot pin will normally leave a lip around the hole both above and below the upper and lower surfaces respectively of the top layer. In accordance with the invention means such as an ultrasonic electrode or a heated probe is employed to provide channels through the lip in the upper surface only so that liquor can drain easily from the bottom of the tray through the holes into the interior of the hollow sheet or board. However, because the lip on the underside of the holes is intact, liquor will not normally be able to drain back into contact with the food even if the tray is inverted. No absorbent pad is needed.
Preferably, the holes are star-shaped and the channels referred to above are formed in the interstices between adjacent points of the star.
The invention will be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a diagrammatic sectional view of a tray in accordance with the invention;
FIG. 2 is a plan view on an enlarged scale of a portion of the base or the tray illustrating a hole;
FIG. 3 is a section on line III--III in FIG. 2; and
FIG. 4 is a top plan view of a tray blank.
Referring to the drawings, in particular FIGS. 1 to 3, a tray generally designated 10 for the packaging of foods such as meat or fish which exude liquor is formed from a corrugated polyolefin sheet material by moulding. The sheet thus has an upper layer 11 and a lower layer 13. The edges 12 are sealed as illustrated. The tray has a base 14 on which the food product (not shown) is placed, and this is provided with a number of holes 16 which are generally star-shaped in plan (see FIG. 2).
The holes 16 are formed in the upper layer 11 by using a heated pin or die and, accordingly, a lip 18 of the thermoplastic material forms around the hole. The lip extends both upwardly of the upper layer of the base 14 and below the upper layer in approximately equal amounts. This lip would prevent to a great extent liquor from th
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Elkins Gary E.
FRA. Mo Snc di Franca Riva & C
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