Manufactoring process of plastic, in particular for the packing of the food products, installation for the implementation of present process and products in conformity with those obtained by this process or similar process.

AS AFRICAN AND MALAGASY

INDUSTRIAL PROPERTY

P. 887

Yaounde (Cameroon)

o.cm vp. THE I.

The VO PATENT International Patent Classification: 29 - b 65 no. 00403 b.

10 To 16 hr 24 October 1964 requested Mn to IO.A.M.P.I. (G.P. no. 50,480) by the Company called : George-LeSieur and wires thereof, residing in France.

Delivered 15 May 1966, published at Official ballot n° 4/5 of 1966. Priority: Patent application filed in France under the n° G.P. 927,841 13 March 1963 on behalf of the applicant.

Method of making plastic, particularly for packaging food products, plant for carrying out the present method and products according to those obtained by the present method or similar method.

Many combinations, resins or poly -

chloride ' vinyl emulsion polymerized, slurry

or weight, or various copolymers, were made

to obtain with adjuvants complement a pro -

bro particulate powder or granulated, for

manufacture of various articles.

Examination of the different mixtures hitherto proposed

emphasizes that none is the set of

different criteria imposed to a suitable material for -

ditionnement of certain foods.

Some of these blends, although consistent with the

legal French or foreign regarding

food packaging, cannot resist

the requirements of the commercial package adapted to nor -

traintes employment of the commercial or

consumption.

Other products can satisfy on these

same requirements, but, while in rule with

foreign Legislatory requirements, evasive frame of office adminis -

except French.

Other mixtures, according to the French legislation

as to their components, no longer because of the

migration in the package contents elements adapted -

the replies as doubtful after long experimented -

translocation.

The present invention aims to remedy these

disadvantages and relates, especially for this purpose a pro -

supplied for manufacturing plastic material, in particular for

the packaging of food products, method characterized

by added successiment - electron tube during the

cation of the adjunct materials and mixing said

materials to ground in several areas of

mixture, thereby in particular obtaining material

transparent plastic, resistant; malleable and maintaining

the organoleptic qualities of products packaged in

the different medium conditions and ambient.

The invention also relates to a plant - CHAR

terized by that the mixing zones are made

by enclosures successively arranged one at -

on top of the other, thereby, especially by gravity, the sequence of operations.

The invention relates, as new industrial product, a plastic material conforming to that obtained by the present method or similar method.

The invention also relates to products, such as packaging or other, obtained using the plastic material according to the present invention.

An installation, according to the invention, is represented, by way of non-limiting example, on the single herewith map which represents a schematic view showing a system for implementing the present method or similar method.

The base resins being calculated for a value of 100 parts are constituted by a mixture of both a polyvinyl chloride suspension or mass for a relatively low value K (the value K is given by the formula of Fikenstscher with dissolved in cyclohexanone), on the other hand a copolymer of a vinyl chloride polymer and a monomer acting as internal plasticizer such an ester of ethylene isomers; the proportions of this mixture are variable due to the degree of plasticity required in the finished product.

All other materials are calculated in part by weight relative to the resin mixture above base determined.

Because of the differences of compatibility adjuvants with each other and with one or the other of the two base resins, it is preferable to carry out multi-phase mixtures.

According to the invention, the method is effected as follows:

In an I mixer, introduced a portion of base resins by the inlet tubing 12, to which is added the elements of a high molecular weight resin resulting from combining the β aminocrotonic acid esters and di - hydroxyl of a polycondensate of epichlorohydrin, for a weight value of 1 to 4 parts of the entire mixture of the base resins.

This mixture is kneaded by means of a stirrer 2 for a period of 15 to 30 min.

Blending these components being effected to descend by gravity through a pipe 3 at the bottom portion of the first mixer 1, the said pipe being provided with a diaphragm 4 for adjusting the rate of flow of the mixture.

The above mixture, falling by gravity, arrives in a disintegrator-mixer continuously 5. The pulper-mixer rotates in high speed rotation and allows homogenization intensive commodities.

The output of the disintegrator-mixer, a pipe 6 opens into a second mixer having a stirrer 7 8.

The mixer is provided with a heater to double casing 18, such as thermostatic cabinet or the like.

This second mixer is under a vacuum of the order of 600 to 700 mm mercury via a vacuum connection 14.

The enclosure of the mixer can holding vacuum through a system of valves 9 and 18 χ closing the inlet and outlet of the enclosure.

Once the vacuum formed, is added, with a feed hopper 13 with an aperture 16 located at the upper part of the enclosure, the complement of the mixture base resins and constituents of adjuncts that is present as solid, non-vinylic copolymers such as high molecular weight e.g. acrylonitrile butadiene-styrene or styrene butadiene latexes methacrylate weight value for a 3 to 20 parts of the mixture base resins as well as the alkali and adjuvants.

This mixture is subjected to a prêchauflage between 40 and 80 °c, then introduced over the mixture of base resins and the solid components make-up, by a spraying device 11 located within the second enclosure, the liquid adjuvants supplied by way of a pressurized storage tank 10.

After spraying said mixture, is chauâe enclosure at a temperature of between 90 °c and 125 °c for a period of 30 to 90 min, stirring and under a vacuum of the order of 600 to 700 millimeters mercury, naturally temperature checks and vacuum are performed using a thermometer and a manometer 15 17, the agitation being provided by an agitator 8.

The descent of the mixture occurs by gravity, after opening valves 18i, by means of the tubing 26 that arrives in another mixer 27 provided with a cooling system to dual chamber 22 by circulation of cold water or other suitable means for cooling the mixture under vacuum through a vacuum connection 19 to a temperature of about 30 to 40 °c. The void of the cooling zone has utmost importance; indeed, it prevents oxidation of the powdery mass by removing the moist air in the stirring tank, and, in this way, delaying its induction period.

This third mixer is provided with a temperature control device and vacuum via a thermometer 20 and a manometer 21.

The agitation is provided by an agitator 28 driven by an electric motor.

The mixture once cooled, valve is opened the 22i and the mixture falls by gravity through piping to 22₂ .

Accordance with the desired application, the mixture can be carried /' in bag 24 directly for immediate use, IJ or in a gritty 29 for the powder into pellets and hence promote better ^ preservation.

It is clear that, during mowing operation time, the mixture remains in dry powder form, because the different processing temperatures are below the gelation temperature of the mixture of plastics material.

It is be understood that the ingredients introduced the weight values are determined by the various parameters of evolution of the hardware used for the shaping. For example:

The rotational speed of the extruder screw is related to the thermal scale working according to various uses desired.

Dyes may be added to this mixture according to colour tinge.

By way of non-limiting example, such a mixture will have, on a 90 mm diameter extruder for 20 to 30 times the diameter as screw length, an hourly throughput of 100 kg, to 140 kg by starting from a powder mixture.

By way of non-limiting example, a manufactured object with a mixture responsive to the present Patent, in the species a bottle of 1 liter manufactured by blow molding, will respond to the following characteristics:

Drop strength drill chuck and plugged at 60 cm height (% breakage) 0 held cool feeling after dwelling to

-15 °c (note 5) 4 scanning at room temperature (% breakage). 0. resistance at 115 mm Hg vacuum burst strength (kilograms) cm.² 2.9 Crush resistance (kilogram) weight of the article 20 (grams) 35 in another embodiment of the invention, the device for performing the present method may be performed on a same plane, and, as a result, the transfusion products in the different mixing zones will be effected with the aid of a vacuum extractor.

The products obtained by the present method provides good thermal stability, for reincorporating drops making up to 30 % weight without changing the initial hue of the article.

On the other hand, the organoleptic tests are very satisfactory, not changing taste for food products currents after several months storage^! j is performed to light, in incubator at 38 °c, and oven-tropi - $ wedge, with respect to the packaged products-control glass. i on the other hand, the plastics material obtained by the present method has several advantages - NOTAMs