Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1987-04-30
1989-01-31
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156263, 156285, 156286, 156292, 264512, 264545, B29D 1700
Patent
active
048013471
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improved tray for packaging and relates particularly but not exclusively to an improve tray for use in the packaging of foods.
BACKGROUND OF THE INVENTION
Hitherto foods have been packaged in a relatively shallow tray and covered with a plastics material web at least on the upper surface of the tray. The plastics material from which the trays are made is usually of a single relatively rigid piece of plastics material or expanded polystyrene and it is considered that the cost of this tray is expensive.
STATEMENT OF THE INVENTION
The present invention has been devised to provide an improved method for the manufacture of such tray wherein the tray can be fabricated from this webs of plastics material and yet be less expensive and of approximately similar strength and rigidity as the former trays.
According to a first broad aspect of the present invention there may be provided an improved method of producing a packaging tray comprising: die part so that the die part is between the webs, relationship to said aperture, to draw the web closest to said female die cavity thereinto, web into said aperture, female die cavity or said male die member having a surface which will form corrugations in one of the webs, so that the two webs can be bonded together, touch the other web.
Most preferably the internal surface of the female die cavity and the external surface of the male die member correspond in size and shape to that of the aperture--i.e. the perimeter of the tray--so that during the method, the formed tray is severed by the male die member and the female die cavity as they are inserted into said aperture. The male die member and the female die cavity can therefore be considered as a punch and die.
In accordance with a further aspect of the present invention there is provided a tray produced by the above method.
In accordance with a further aspect of the present invention there is provided an apparatus for producing a packaging tray from at least two webs of plastics material comprising a die part having an aperture therein,
a male die member and a female die cavity each mounted so that said die part if therebetween and so that said male die member and said female die cavity are alignable relative to said aperture,
said female die cavity having an air aperture therein for permitting the providing of a reduction of air pressure to said female die cavity,
said die member having an air opening communicating with said aperture for permitting the providing of a reduction of air pressure in said aperture,
at least one of said male die member and said female die cavity having a surface which will form corrugations in one of the webs when contact is made therewith, the aperture being such that when said at least two webs of plastics material are held in spaced apart relationship over said aperature with said die part therebetween, said female die cavity can be applied to one of the webs in aligned relationship to said aperature, a reduction in air pressure can be made to said female die cavity by exhausting air from said air aperture whereby to draw the web closest to said female die cavity into said female die cavity, a reduction in air pressure can be made to said air opening to draw the web of plastics material closest to said male die member into said aperture, and where said male die member can then be inserted into said aperture and pressure relatively applied to said female die cavity so that the two webs can be bonded to each other at least where the corrugations which have been formed in one web touch the other web.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention can be more clearly ascertained one preferred embodiment will now be described with reference to the accompanying drawings wherein:
FIGS. 1 through 6 shows various method steps.
Each of the FIGS. 1 through 6 are vertical cross-sectional views taken through the male die member, the die part and the aperture, and the female die cavity.
DETAILED DESCRIPTION OF PREFERRED EMBODIME
REFERENCES:
patent: 2670501 (1954-03-01), Michiels
patent: 3047451 (1962-07-01), Beck et al.
patent: 3242245 (1966-03-01), Greig et al.
patent: 3250660 (1966-05-01), Greig et al.
patent: 3446686 (1969-05-01), Butler et al.
patent: 3616013 (1971-10-01), Bocchi
patent: 3814784 (1974-06-01), Wolf
patent: 4192701 (1980-03-01), Martin et al.
patent: 4337116 (1982-06-01), Foster et al.
patent: 4457797 (1984-07-01), Hatchadoorian et al.
Ball Michael W.
Garwood Limited
Herb David
LandOfFree
Method of producing a packaging tray does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing a packaging tray, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing a packaging tray will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-176145