Method of producing small crates or other plastic receptacles by

Details Method of producing small crates or other plastic receptacles by Method of producing small crates or other plastic receptacles by

1992-09-21

1994-12-06

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156227, 15624411, 15624418, 15624419, 15624422, 156252, 156253, 156256, 156257, 156268, B29C 4700

Patent

active

053707583

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a method to series produce a plastic receptacle with the overall shape of a parallelpiped and able to be used as a small crate for the handling, packaging and transportation of agricultural products, such as fruit or vegetables.
There currently exist several types of crates with variable dimensions and composed of diverse materials, such as wood, cardboard or plastic materials, such as vinyl polychloride, polyethylene, polypropylene and expanded polystyrene, all these materials being cited as examples. Crates made of wood or cardboard have on usage two major drawbacks. The first one is their permeability to water which firstly significantly reduces the mechanical resistance of the crates and secondly considerably alters the weight of the tare constituting said crates. The second drawback resides in the fact of their inflammability and the risks inherent of this characteristic concerning storage, whether the crates be empty or full. So as to mitigate these drawbacks, users would like to be able to replace cardboard or wooden crates with impermeable plastic and preferably non-inflammable crates. However, existing plastic crates do have the drawback of being much more expensive than wooden or cardboard crates. It is well-known that this extra cost is due far less to the cost of the plastic material than to its transformation into a finished product. In fact, plastic material transformation methods used to industrially produce crates or similar shaped receptacles are currently thermoforming, pressing-moulding or via injection and rotational plastic moulding, that is methods with discontinuous production requiring a long expensive production time. The purpose of the present invention is to overcome this drawback by reducing the cost of transformation of the plastic material into a finished product into the form of a crate or other receptacle. The principle retained to reduce this transformation cost is to significantly increase the production flowrate of crates or other receptacles by using the continuous transformation method of the plastic materials represented by extrusion, said method requiring with equal productivity an investment in machines and tools significantly lower than that for machines and tools used in the above-mentioned discontinuous transformation methods and in particular for producing a large number of plastic crates or other plastic receptacles.
The present invention concerns a method to produce plastic crates or other plastic receptacles at a high flowrate by mounting, possibly automated, of two or several types of perforated or truncated extruded profiles with suitable shapes and mechanical properties.
The present invention shall be more readily understood on reading the relevant details of the following description with reference to figures of the attached diagrams, namely:
FIG. 1 shows an overall view of the plastic crate or receptacle 5 to be produced and which comprises a bottom 5a and four sides 5b, 5c, 5d and 5e,
FIG. 2 shows the shape the profile may assume with one section 1 intended to form the bottom 5a and two opposing sides 5b and 5c of the plastic crate or receptacle 5,
FIG. 3 shows the shape the profile may assume with two sections 1a and 1b intended to form the bottom 5a and two opposing sides 5b and 5c of the plastic crate or receptacle,
FIG. 4 shows the shape the profile 3 may assume with two sections intended to form the two sides 5d and 5e of the plastic crate or receptacle 5.
FIG. 5 shows a perforation example 4 of the surface of any one of the sides 5b and 5c or of the bottom 5a of the plastic crate or receptacle 5 to be produced,
FIG. 6 shows another perforation example 6 of the surface of any one of the sides 5b and 5c or the bottom 5a of the plastic crate or receptacle to be produced.
FIG. 7 shows a perforation example of any one of the sides 5d and 5e of the plastic crate or receptacle to be produced,
FIG. 8 shows one particular detail of a border 7a of the profile 7 and the possibility to use a pile-up pin 12.
As shown on FIG. 2 and

REFERENCES:
patent: 2952039 (1960-09-01), Jaffe
patent: 3935357 (1975-01-01), Padovani
patent: 4816093 (1989-03-01), Robbins

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