WO2001081193A1 - Corps moule revetu d'une pellicule - Google Patents

Corps moule revetu d'une pellicule Download PDF

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Publication number
WO2001081193A1
WO2001081193A1 PCT/EP2000/005573 EP0005573W WO0181193A1 WO 2001081193 A1 WO2001081193 A1 WO 2001081193A1 EP 0005573 W EP0005573 W EP 0005573W WO 0181193 A1 WO0181193 A1 WO 0181193A1
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WO
WIPO (PCT)
Prior art keywords
biodegradable
molded body
film
molded article
outside
Prior art date
Application number
PCT/EP2000/005573
Other languages
German (de)
English (en)
Inventor
Thomas KÖBLITZ
Anneliese Kesselring
Norbert Kaiser
Original Assignee
Apack AG für Biologische Verpackungen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apack AG für Biologische Verpackungen filed Critical Apack AG für Biologische Verpackungen
Priority to AU2000261505A priority Critical patent/AU2000261505A1/en
Publication of WO2001081193A1 publication Critical patent/WO2001081193A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B65D65/466—Bio- or photodegradable packaging materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the invention relates to biodegradable moldings, in particular containers, with inside and outside and at least one opening based on a composite formed from starch and biodegradable fiber material.
  • WO 95/20628 (PCT / EP95 / 00285) describes a process for the production of moldings, in particular packaging moldings, from biodegradable material using a viscous mass which contains biodegradable fiber material, water and starch and with the formation of a fiber material starch -Composite is baked in a baking pan, known. Waste paper, recycled material, wood or paper sanding, beet pulp and the like can be used as fiber material. These fiber-containing materials are traced back to their fiber structure. However, cellulose fibers can also be used directly.
  • other additives such as fillers, fluxes or dyes can be added.
  • a dough is then prepared by mixing, which can then be baked into shaped bodies such as, for example, cups, cups, plates, bowls, trays, etc., in waffle molds known per se from wafer baking technology.
  • the molded articles produced using starch, biodegradable fibers, such as cellulose fibers, and water are completely biodegradable. This means that these moldings can be completely broken down under the influence of bacteria, fungi and moisture as well as heat in composting plants within a few weeks.
  • the biodegradable shaped bodies which are based exclusively on renewable raw materials and which can be easily composted after use represent a significant advance in ecological and economic terms Since the molded articles based on starch and cellulose fibers are completely biodegradable, there are no charges for the "Green Dot" waste system introduced in Germany. It is disadvantageous that the molded articles based on starch and cellulose fibers are sensitive to moisture. In this respect, the shaped bodies based on starch and cellulose fibers can only be used to a very limited extent as packaging for, for example, beverages or dishes which have a high water content. This means that the production of, for example, completely biodegradable cups or cups for holding cold or, in particular, warm drinks is a major problem, since the cups or cups quickly dissolve or decompose under the action of the liquid.
  • WO 94/13734 therefore proposes to coat starch-containing moldings by applying a lacquer so that they are resistant to moisture for the usual periods of use, even at elevated temperatures. It is disadvantageous, however, that organic solvents such as ethanol, ethyl acetate, acetone, etc. must be used in this process. When using the lacquer known from WO 94/13734, it is therefore necessary that protective measures for the operating personnel have to be taken when coating biodegradable shaped bodies based on starch. Since these moldings are mass-produced articles, in order to be competitive with conventional plastic-based moldings, they have to be manufactured as inexpensively as possible. However, the protective measures to be taken when using the organic solvents are very cost-intensive.
  • the lacquer known from WO 94/13734 is applied to the biodegradable molded body by pouring, brushing, spraying or spinning.
  • these application techniques there is always the risk that the article is not completely coated or with a uniform thickness.
  • the object will quickly soak or decompose in the uncoated or only thinly coated areas due to the effects of moisture.
  • the object of the present invention is therefore to provide biodegradable moldings which do not have the disadvantages known in the prior art and in particular have improved resistance to moisture and liquids.
  • the object on which the invention is based is achieved by a biodegradable molded body, in particular a container, with an inside and an outside and at least one opening based on a composite formed from starch and a biodegradable fiber material, the inside and the outside of the molded body each have a layer resistant to liquids, the layers being formed from biodegradable film applied to the molded body.
  • biodegradable moldings which have a layer which is resistant to moisture or liquids and has a uniform layer thickness.
  • biodegradable moldings is understood in particular to mean containers such as plates, cups, mugs, hamburgers, bowls, trays, etc. These moldings are made from a bakable mass, which comprises starch, biodegradable fiber material and water, and optionally additives such as protein, fillers, fluxes, dyes, etc.
  • the bakable mass is then baked into a shaped body in waffle molds known per se from wafer baking technology.
  • the waffle shape has a shape corresponding to the molded body to be produced.
  • the baking process takes about 10 to 100 seconds, preferably 60 seconds, at a temperature of 100 to 200 ° C, preferably at 150 ° C in the closed baking pan.
  • starch is understood to mean natural starch, chemically and / or physically modified starch, technically produced or genetically modified starch and mixtures thereof.
  • Starch can be used as starch from corn, for example corn, waxy maize, wheat, barley, rye, oats, millet, rice, etc. or cassava or sorghum.
  • the starch contained in legumes such as beans or peas or the starch contained in fruits such as chestnuts, acorns or bananas can also be used.
  • the starch contained in roots or tubers can also be used.
  • Potato starch is particularly suitable.
  • the potato starch advantageously contains one phosphorus ether group per 200 to 400 anhydroglucose units.
  • the negatively charged phosphate groups are linked to the C6 position of the anhydroglucose unit.
  • the negatively charged phosphate groups by means of mutual repulsion, detangle the individual potato amylopectin molecules. Due to the mutual repulsion of the negatively charged phosphate groups, the branches of the amylopectin molecules are largely unfolded or stretched out. This presence of esterified phosphate groups results in a high viscosity of potato starch-water mixtures.
  • biodegradable fiber material means in particular vegetable and animal fibers.
  • cellulose-containing fibers are preferably used as vegetable fibers.
  • Cellulose-containing fibers are fibers of any kind that contain cellulose or consist of cellulose. Animal fibers are so-called protein fibers such as wool, hair or silk.
  • Vegetable fibers that can be in different lengths and widths are particularly preferably used.
  • plant fibers which have a length in the range from approximately 50 ⁇ m to approximately 3000 ⁇ m, preferably from approximately 100 ⁇ m to approximately 2000 ⁇ m, further preferably from approximately 150 ⁇ m to approximately 1500 ⁇ m, more preferably from approximately 200 ⁇ m to approximately 900 ⁇ m , most preferably from 300 ⁇ m to about 600 ⁇ m.
  • the width of the plant fibers can be in a range from approximately 5 ⁇ m to approximately 100 ⁇ m, preferably from approximately 10 ⁇ m to approximately 60 ⁇ m, particularly preferably from approximately 15 ⁇ m to approximately 45 ⁇ m.
  • the fibers are mainly made from wood, hemp or cotton. Such fibers can be produced in a manner known to the person skilled in the art.
  • biodegradable moldings can also contain protein on the basis of a composite formed from starch and biodegradable fiber material.
  • protein is understood to mean biopolymers based on amino acids. All so-called proteinogenic amino acids, i.e. the amino acids usually involved in protein building, as well as the so-called non-proteinogenic amino acids, which are usually not involved in protein building.
  • protein is also understood to mean peptides or polypeptides.
  • protein in the context of the invention also includes naturally occurring protein, chemically modified protein, enzymatically modified protein, recombinant protein, protein hydrolyzates or mixtures thereof.
  • the protein can be of vegetable or animal origin.
  • a bakeable mass (baking mass, dough), which comprises starch, biodegradable fiber material, protein and water, surprisingly enables a shortening of the baking time of up to 35%, preferably up to 50%, compared to a bakeable mass without the use of protein.
  • the use of protein enables the material requirement for the production of moldings to be reduced by up to 10% by weight to 20% by weight.
  • proteins of animal origin such as actin, myoglobin, myosin, hemoglobin, collagen, elastin, immunoglobulins, keratins, fibroin, conchagens, ossein, albumins, caseins, FPC (fish protein concentrate) can be used as proteins.
  • Casein, alkali caseinate, alkaline earth caseinate, casein hydrolyzate and mixtures thereof can also be used.
  • Prolamines such as e.g. Gliadin, Secalin, Hordein, Zein and corn and soy protein can be used. Soy protein in particular has proven to be extremely suitable. Soy protein is also extremely advantageously available commercially in large quantities at low cost.
  • Hydrophobic proteins are preferably used as proteins. Hydrophobic proteins are characterized by a high proportion of uncharged amino acids in the amino acid sequence. In particular, these proteins contain high proportions of glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, proline and methionine, all of which give the protein a hydrophobic character.
  • proteins listed above are only an exemplary selection to illustrate the invention. Of course, other proteins or protein mixtures can also be used. An important criterion is that the price of the protein or protein mixture to be used is low in view of the very large numbers of moldings to be produced.
  • a molded body produced using a protein-containing bakable composition has a more closed surface.
  • a more closed surface is particularly advantageous with regard to the thermal insulation ability of the molded body.
  • the bakable mass can additionally comprise additives.
  • additives make it possible to influence the properties of the biodegradable molded article produced.
  • . can be contained in the bakable mass as additives hydrophobizing agents, whitening agents, food colors, flavorings etc.
  • additive includes any compounds that are suitable for influencing the product properties of the molded body. These additives are preferably completely or essentially completely biodegradable. Preferred examples these additives are hydrophobizing agents, whitening agents, colorants, food colors, flavorings, etc.
  • Hydrophobizing agents are constituents which impart hydrophobic properties to the molded article produced.
  • Whiteners are compounds that are used to lighten the color of the moldings.
  • blue dyes are used as dyes, which are used, for example, for coloring fruit bowls or fruit carriers.
  • the following blue dyes can be used, for example: natural colors or lacquered colors.
  • Green dyes are also used, for example, which are used for coloring shells to hold plants.
  • the following green dyes can be used, for example: natural colors or lacquered colors.
  • Food colors are dyes used to color the packaging of food.
  • any aroma substance in particular biodegradable aroma substance, which, for example, imparts a certain smell and / or taste to the molded article produced, can be used as the aroma substance.
  • hydrophobizing agents are fluoroalkyl polymers, the term "fluoroalkyl polymers" indicating that these are polymers which are composed of, in particular, repeating alkyl units, it being possible for one or more, possibly even all, hydrogen atoms to be replaced by fluorine atoms.
  • a hydrophobizing agent based on a perfluoroalkyl acrylate copolymer can be used.
  • the whitening agent can be a compound with at least one disulfone group.
  • Such compounds are well known to those skilled in the relevant technical field.
  • An example of such a disulfonic acid compound is 4,4'-bis (1,3,5-triazinylamino) stilbene-2,2'-disulfonic acid.
  • baking mass is understood to mean a baking mass or a dough which can be baked in baking devices known from wafer baking technology, such as baking tongs, to form a shaped body.
  • the bakeable mass is, for example, placed in a heated baking mold of such a known baking device, whereupon the bakeable mass is distributed in the baking mold and fills it completely.
  • the bakeable mass present in the baking pan releases water or water vapor when it is subjected to heat, which flows out of the baking pan provided outlet channels emerges. During this process, the bakeable mass is solidified, providing the desired shaped body.
  • the bakable mass contains from about 3% to about 15%, preferably from about 5% to about 10%, most preferably from 7.8% to about 9.8% by weight.
  • biodegradable fiber material preferably cellulose-containing fibers.
  • the bakable composition preferably contains from about 6% by weight to about 30% by weight, preferably from about 10% by weight to about 25% by weight, most preferably from about 16.1% by weight to about 20.05 % By weight native starch.
  • the bakable composition preferably contains from about 2% by weight to about 10% by weight, preferably from about 4% by weight to about 8% by weight, most preferably from about 5.4% by weight to 6.8 % By weight pre-gelatinized starch.
  • the bakable composition preferably contains from about 45% by weight to about 90% by weight, preferably from about 60% by weight to about 80% by weight, more preferably from about 60% by weight to about 75% by weight , most preferably from about 63% to about 71% by weight water.
  • Protein in the bakeable mass is preferably in an amount of up to 10% by weight, preferably up to about 5% by weight, more preferably about up to 3% by weight of protein, most preferably up to about 2% by weight. % contain.
  • a fat-containing release agent can be added during the preparation of the bakable mass.
  • the biodegradable moldings produced in accordance with the above explanations have a fiber material-starch composite or, when using protein, a fiber material-starch-protein composite.
  • the biodegradable film applied to the inside and outside of the biodegradable molded body prevents moisture or liquids from coming into contact with the starch-fiber material composite.
  • the one used A barrier effect against moisture or liquids.
  • This barrier effect is sufficient for the usual use times of the shaped bodies. In the case of fast food restaurants, the times of use range from a few minutes to hours. If the coated moldings are used as food dishes for the sale of, for example, fresh fish or raw meat, the period of use can also be several days, for example up to 14 days.
  • the molded articles provided with foils are extremely advantageous biodegradable.
  • the used moldings according to the invention can be composted as a whole or comminuted. During composting, moisture and microorganisms, such as e.g., act at elevated temperatures, which can be up to 70 ° C. Bacteria and fungi, on the molding material. The degradation takes place within a few weeks to several months depending on the external conditions.
  • the outside of the molded body can, for example, be completely or partially coated with biodegradable film. If the biodegradable molded body is, for example, a cup, the outside of the cup can, for example, only be partially coated with a film. It may be sufficient for only the edge region to be coated along the circumference of the opening of the cup. This ensures that the edge area of the cup does not dissolve or decompose when drinking liquid from the cup.
  • the molded body has a layer of biodegradable film on all sides.
  • the molded body is thus extremely advantageously completely coated with a biodegradable film. Moisture or liquid can thus also act on the molded body from the outside without the molded body disintegrating or decomposing.
  • the molded body is a cup, for example, the cup can thus also be placed on a moist or wet surface without the cup dissolving from the outside.
  • moldings provided with a biodegradable film on all sides can be used, for example, as trays for foods such as fresh fish, raw meat, etc.
  • These food trays filled with meat or fish, for example, are found in supermarkets on the refrigerated shelves in The viewing height is increasingly placed upright so that the customer can look directly at the meat or fish arranged in the bowl. Since moisture or liquid, for example in the form of blood, regularly escapes from the meat or fish and then collects in the lower region of the upright shell, it is necessary for the shells to be provided with a liquid-tight layer from both sides.
  • a biodegradable film is preferably applied to the inside and the outside.
  • the biodegradable films applied on the inside and on the outside of the molded body are connected to one another in a substantially liquid-tight manner in the edge region of the opening of the molded body lying between the inside and the outside.
  • the foils are very preferably connected to one another in such a way that the edge is coated in an absolutely liquid-tight manner.
  • an adhesive is applied in the edge area, which supports a connection of the foils arranged on the inside and on the outside of the shaped body.
  • biodegradable foils are welded to one another in the edge region of the opening of the molded body lying between the inside and the outside.
  • the biodegradable film is applied to the shaped body without an adhesion promoter.
  • the biodegradable film applied to the molded body preferably has a thickness of up to about 100 ⁇ m.
  • the thickness is more preferably up to about 50 ⁇ m.
  • the biodegradable film is made from materials selected from the group consisting of cellulose ester, polyester, polyester derivative, polyester amide, starch, cellophane and mixtures thereof.
  • thermoelasticity or thermoplasticity required for deep drawing.
  • the cellulose esters are further preferably selected from the group consisting of cellulose acetate, cellulose diacetate, cellulose acetobutyrate, cellulose butyrate, cellulose propionate, cellulose acetopropionate and mixtures thereof.
  • the aforementioned cellulose derivatives are formed by esterifying the corresponding acids with the cellulose. Up to three OH groups of the glucose residue can react here. For example, cellulose acetate with a degree of substitution of approximately 2.4 is preferably used.
  • the films to be used can, for example, up to 30% Contain plasticizers based on aliphatic, non-aromatic esters and polyesters that improve thermoplastic processing. For example, dimethyl, diethyl and dimethyl glycol phthalate can be contained as plasticizers.
  • the degree of substitution influences, on the one hand, the physical properties of the cellulose derivatives and, on the other hand, the rate at which they biodegrade.
  • a film made of cellulose acetate with a degree of substitution of approx. 2.4 and a film thickness of less than 200 ⁇ m is degraded up to 80% in 9 to 10 weeks (storm test according to DIN-EN 29439 or E DIN 54900 (draft) "test the compostability of polymeric materials ", part 3).
  • an anarobic test in accordance with ASTM-D 5210-91 the degradation of ground cellulose acetate films with a layer thickness of 50 ⁇ m took place within 6 weeks.
  • diethyl phthalate, diisopropyl phthalate, di-2-ethylhexyl phthalate, dibutyl phthalate or mixtures thereof can be used as plasticizers for cellulose acetate.
  • suitable plasticizers for cellulose propionate are di-2-ethylhexyl phthalate, dibutyl adipate, di-2-ethylhexyl adipate, dibutyl sebazate, dibutyl acetate, dioctyl acetate or mixtures thereof.
  • cellulose ester films are extremely advantageously resistant to moisture or water, so that they give the biological starch-based molded articles adequate protection so that they can be used, for example, as a container for food or beverages.
  • films made of cellophane ie films made of regenerated cellulose (so-called cellulose hydrate), which is sold, for example, under the "Cellophan” brand, can also be used.
  • polyesters are selected from the group consisting of polylactic acid, poly- ⁇ -hydroxybutyrate, poly- ⁇ -hydroxyvalerate, polycaprolactone and mixtures thereof.
  • the polyester is preferably polylactic acid, preferably poly-L-lactic acid.
  • the polylactic acid films may also contain plasticizers.
  • Polylactic acid films can be produced extremely advantageously from renewable raw materials.
  • poly- L-lactic acid is grown entirely in accordance with ASTM D 5338. When composting in a rent, complete degradation takes place within ten weeks at the appropriate rent temperatures under the influence of moisture and microorganisms.
  • Suitable polylactic acid films can be obtained, for example, from Neste Oy, Porvoo / Borga, Finland, or from Mafo Systemtechnik, Teisendorf, Detschland.
  • the polyester is particularly preferably a copolymer of poly- ⁇ -hydroxybutyrate and poly- ⁇ -hydroxyvalerate.
  • This copolymer can be produced by fermentation of sugar raw materials by microorganisms. Films based on this copolymer are stable, durable and moisture-resistant. The copolymer is also stable to oils. Furthermore, films based on the abovementioned copolymer can be applied very well to the biodegradable shaped bodies based on starch by means of thermoforming. A film made from a copolymer of poly- ⁇ -hydroxybutyrate and poly- ⁇ -hydroxyvalerate is sold by the company Monsanto, Düsseldorf, Germany, under the "Biopol" brand.
  • the film is further preferably a copolyester of 1,4-benzenedicarboxylic acid, 1,4-butanediol and hexanedicarboxylic acid. It has been found that using a film based on the aforementioned copolyester, which is marketed, for example, by the Eastman Chemical Company, Kingsport, USA, under the name "Eastar BIO Copolyester 14766", with a film thickness of 25 to 50 ⁇ m can be applied.
  • a polyester amide is used, which is preferably a copolymer of PA 6 or PA 66 and aliphatic ester.
  • PA 6 generally refers to a polyamide that is made from ⁇ -caprolactam.
  • PA 66 generally refers to a polyamide made from hexamethylene diamine and adipic acid.
  • a film sold by Bayer, Leverkusen, under the name "Polyesteramide BAK 1095” can be used.
  • This film can be deep-drawn very well and has good weldability.
  • this "polyester amide BAK 1095” under the influence of bacteria or fungi and moisture as well as essential minerals according to DIN 54900 degradable. This means that a biodegradable molded body provided with this film can be completely broken down by composting.
  • the biodegradable film is made from starch. Film thicknesses of 20 to 100 ⁇ m, for example 35 ⁇ m, can be set. Starch films are completely compostable.
  • BIOTEC the natural packaging from BIOTEC
  • the object on which the present film is based is also achieved by providing a method for producing a biodegradable shaped body, the shaped body in a first step on the inside of the
  • Shaped body is provided with a first biodegradable film, possibly the protrusion of the first film in the edge region of the opening of the
  • the molding is provided in a second step on the outside of the molding with a second biodegradable film, the excess of the second film in the edge region of the opening of the molding is optionally largely removed, and the first and second biodegradable film in the one between the inside and the
  • Outside edge region of the opening of the molded body are connected to each other.
  • the biodegradable film is applied to the inside of the molding by thermoforming the film, the film being arranged over the opening of the molding and being applied to the inside of the molding under the action of heat.
  • the heat can be brought about, for example, by irradiation of infrared radiation.
  • the film is brought to a temperature suitable for thermoforming. This temperature depends on the composition of the thermoplastic film used. The temperature is usually in a range between 50 and 150 ° C., for example between 70 ° C. and 130 ° C.
  • the lamination time required for applying the film to the shaped body is regularly about 1 s to about 10 s, for example 2 s to 5 s.
  • the heat applied to the film can be brought about by arranging, for example, heating elements, for example heating coils, or infrared radiators above the biodegradable film.
  • a biodegradable film can be applied to the biodegradable molded body produced in accordance with the above statements, which has generally cooled to ambient temperature, by means of thermoforming.
  • the film is generally applied using thermoforming techniques. In these processes, the film is subjected to heat so that it changes into a thermoelastic or thermoplastic state.
  • the film can then be pressed onto the inside of the molded body, for example using a stamp.
  • the stamp preferably has a shape that is essentially complementary to the shape of the inside of the molded body.
  • the stamp moves essentially snugly into the molded body and presses the thermoplastic film onto the inside of the molded body, so that the film is pressed flat onto the inside of the molded body.
  • this requires a stamp with an essentially complementary shape for each shape of the molded body.
  • the first biodegradable film is applied to the inside of the molded body by deep drawing, a negative pressure being applied to the molded body.
  • Such a process is also referred to as vacuum forming or vacuum deep drawing. That is, it is preferred that the biodegradable film be applied by vacuum deep drawing.
  • vacuum deep drawing a vacuum is applied to the molded body and the film is drawn into the molded body by the negative pressure.
  • the heat-applied film is previously brought to, for example, a temperature of from about 50 ° C. to 150 ° C., for example from about 70 ° C. to about 130 ° C.
  • the heat-applied film is arranged directly above the opening of the molded body, for example a bowl or a cup.
  • the biodegradable molded body for example the shell or the cup, is made of a porous starch-fiber material composite or a porous starch-fiber material Protein composite built up. The air in the molded body is sucked through the walls of the cup and the film arranged above the opening of the molded body is drawn into the molded body by the resulting negative pressure, the film fitting positively against the inside or the inner surface of the molded body.
  • the film which is in a thermoelastic or thermoplastic state, adheres excellently to the inside of the starch-fiber composite.
  • vacuum deep drawing can also be combined with the use of a stamp.
  • the stamp inserted into the molded body which does not have to have a complementary shape to the inner shape of the molded body, stretches the film into the molded body.
  • a negative pressure can then be applied to the side facing away from the opening of the molded body, the film then applying itself to the inside of the molded body under the influence of the negative pressure.
  • an adhesion promoter can be provided between the biodegradable film and the biodegradable molded article, if this is considered necessary.
  • nitrocellulose, polyvinyl acetate, polyvinyl alcohol or mixtures thereof can be used as adhesion promoters.
  • the adhesion promoter can be applied to the molded body, for example by spraying, dipping, brushing, rolling, etc., before the film is applied.
  • the second biodegradable film is applied to the outside of the molded body by thermoforming the second film, the second being arranged over the side facing away from the opening of the molded body and being applied to the outside of the molded body under the action of heat.
  • the second film can be pressed on using a mold that is complementary to the outside of the molded body.
  • the film is first brought into a thermoelastic or thermoplastic state, and then the molded body can be inserted through the film into the form that is complementary to the outside of the molded body, the film laying against the outside of the molded body.
  • the mold which is complementary to the outside of the molded body it is of course also possible for the mold which is complementary to the outside of the molded body to be placed over the molded body, the film arranged between the molded body and the complementary mold being applied to the outside of the molded body.
  • the second biodegradable film is preferably applied to the outside of the molded body by applying a vacuum, the negative pressure being applied in the edge region of the opening of the molded body, so that the second film is applied to the outside of the molded body.
  • the biodegradable film as shown above, can be applied to the outside of the molded body by pressing the film under heat.
  • the film is pressed onto the molded body via a press mold, the shape of which is complementary to the shape of the outside of the molded body.
  • this procedure requires a compression mold with a corresponding shape for each shape of the molded body.
  • the biodegradable film to be applied to the outside of the molded body is also applied using vacuum deep-drawing processes.
  • a film since a film has already been applied to the inside of the molded body, it is not simply possible to produce a sub-package on the inside of the molded body.
  • the molded body is arranged in a type of vacuum chamber for this purpose.
  • the heat-loaded biodegradable film is arranged on the side facing away from the opening of the molded body, that is to say, for example, in the case of a cup, above the outside of the cup base.
  • a bottom pressure is then applied along the outer edge region of the opening of the molded body, whereupon the biodegradable film, which is in a thermoelastic or thermoplastic state, is applied to the molded body from the outside.
  • the film arranged on the inside of the molded body then connects to the film which lies on the outside of the molded body.
  • the vacuum chamber can have a support shape that supports the molded body to be coated from the inside.
  • the support form does not have to have a complementary shape to the inside of the molded body.
  • the molded body which is already coated on the inside with a biodegradable film, is arranged on this support mold.
  • the opening of the molded body thus points downward, for example. Openings, for example slits, are provided around the shaped body arranged on the support mold in this way along the outer circumference of the opening of the shaped body in the vacuum chamber.
  • the heat-treated, biodegradable film is then placed over the molded body in the vacuum chamber.
  • a vacuum is then applied to the vacuum chamber via the slots arranged along the outer circumference of the opening of the molded body, the biodegradable film, which is in a thermoelastic or thermoplastic state, being drawn along the outside of the molded body in the direction of the slots.
  • the biodegradable film attaches to the outside of the molded body.
  • the foils applied on the inside and the outside of the molded body then preferably fuse with one another.
  • the molded body arranged on a support mold is simultaneously moved upward in the direction of the film arranged over the molded body when a negative pressure is applied via the slots.
  • the biodegradable film After the biodegradable film has been applied to the inside of the molded body, it can be provided that excess film in the edge region of the opening of the molded body is largely removed.
  • the removal can be done, for example, by punching, cutting, welding, or the like.
  • the film is preferably removed so that a few millimeters protrude in the edge region of the opening of the molded body.
  • the film preferably projects less than 2 mm, more preferably less than 1 mm.
  • This protrusion which can be, for example, 0.5 mm to 2 mm, is connected, preferably welded, to the outside of the molded body after the application of a biodegradable film.
  • the protrusion of the second film in the edge region of the opening can correspond to the protrusion of the first film by a few millimeters, preferably less than 2 mm, more preferably less than 1 mm. This means that the protrusion can accordingly be in a range from 0.5 mm to 2 mm.
  • the protrusions on the inside and outside of the film-coated molded body in the edge region can be connected to one another, preferably welded, in a separate working step.
  • the protrusion of the first film on the inside of the molded body is preferably connected, preferably welded, to the same in a common operation when the second film is applied to the outside of the molded body.
  • FIG. 1 illustrates an exemplary embodiment of a device which can be used to apply biodegradable film to the outside of a biodegradable molded body by means of a thermoforming process.
  • FIG. 1 shows a vacuum chamber (1) with heating elements (2), which can be designed, for example, as infrared radiators.
  • a biodegradable molded body (5) which has the shape of a bowl or cup, is arranged on a support element (3).
  • the molded body (5) is arranged on the support element (3) with the opening facing downwards.
  • the molded body (5) is already coated on the inside with a film.
  • a biodegradable film (6) is arranged over the molded body (5).
  • An under-pressure or vacuum can be applied through the openings (4), which can be designed as slots, for example, and are arranged along the outer circumference of the opening of the molded body (5).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Biological Depolymerization Polymers (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un corps moulé biodégradable (5), en particulier un contenant, présentant un côté intérieur et un côté extérieur, et au moins une ouverture (4), ledit corps moulé étant réalisé à base d'un composite constitué d'amidon et d'un matériau fibreux biodégradable. Le côté intérieur et le côté extérieur du corps moulé (5) présentent respectivement une couche résistant aux liquides, lesdites couches étant formées d'une pellicule biodégradable (6) appliquée sur le corps moulé (5). L'invention concerne également un procédé de fabrication dudit corps moulé.
PCT/EP2000/005573 2000-04-26 2000-06-16 Corps moule revetu d'une pellicule WO2001081193A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2000261505A AU2000261505A1 (en) 2000-04-26 2000-06-16 Film-coated shaped body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000120461 DE10020461A1 (de) 2000-04-26 2000-04-26 Folienbeschichteter Formkörper
DE10020461.9 2000-04-26

Publications (1)

Publication Number Publication Date
WO2001081193A1 true WO2001081193A1 (fr) 2001-11-01

Family

ID=7639998

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/005573 WO2001081193A1 (fr) 2000-04-26 2000-06-16 Corps moule revetu d'une pellicule

Country Status (3)

Country Link
AU (1) AU2000261505A1 (fr)
DE (1) DE10020461A1 (fr)
WO (1) WO2001081193A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004113192A1 (fr) * 2003-06-20 2004-12-29 Plantic Technologies Ltd Plaquette alveolaire hydrosoluble d'ouverture facile
DE102013103713A1 (de) 2012-04-25 2013-10-31 Janet Händler Gebrauchsgegenstand aus biologisch abbaubarem Kunststoff und Verfahren zu dessen Herstellung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8637126B2 (en) * 2006-02-06 2014-01-28 International Paper Co. Biodegradable paper-based laminate with oxygen and moisture barrier properties and method for making biodegradable paper-based laminate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422387A (en) * 1991-06-26 1995-06-06 The Proctor & Gamble Company Biodegradable, liquid impervious films
WO1996003886A1 (fr) * 1994-08-05 1996-02-15 Coöperatieve Verkoop- En Productievereniging Van Aardappelmeel En Derivaten Avebe B.A. Recipient biodegradable pour aliments liquides ou semi-solides ou pour produits non alimentaires
WO1996023026A1 (fr) * 1995-01-26 1996-08-01 Rapido Waagen- Und Maschinenfabrik Gmbh Procede de production de corps moules a partir de materiau biodegradable et corps moules ainsi produits
WO1997010293A1 (fr) * 1995-09-12 1997-03-20 Fvp Formverpackung Gmbh Procede de production de pieces moulees pourvues d'une couche barriere et constituees d'un materiau degradable, et pieces moulees obtenues selon ce procede
WO1998035885A1 (fr) * 1997-02-13 1998-08-20 Borbely Jozsef Materiau d'emballage compatible avec l'environnement et son procede de fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422387A (en) * 1991-06-26 1995-06-06 The Proctor & Gamble Company Biodegradable, liquid impervious films
WO1996003886A1 (fr) * 1994-08-05 1996-02-15 Coöperatieve Verkoop- En Productievereniging Van Aardappelmeel En Derivaten Avebe B.A. Recipient biodegradable pour aliments liquides ou semi-solides ou pour produits non alimentaires
WO1996023026A1 (fr) * 1995-01-26 1996-08-01 Rapido Waagen- Und Maschinenfabrik Gmbh Procede de production de corps moules a partir de materiau biodegradable et corps moules ainsi produits
WO1997010293A1 (fr) * 1995-09-12 1997-03-20 Fvp Formverpackung Gmbh Procede de production de pieces moulees pourvues d'une couche barriere et constituees d'un materiau degradable, et pieces moulees obtenues selon ce procede
WO1998035885A1 (fr) * 1997-02-13 1998-08-20 Borbely Jozsef Materiau d'emballage compatible avec l'environnement et son procede de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004113192A1 (fr) * 2003-06-20 2004-12-29 Plantic Technologies Ltd Plaquette alveolaire hydrosoluble d'ouverture facile
DE102013103713A1 (de) 2012-04-25 2013-10-31 Janet Händler Gebrauchsgegenstand aus biologisch abbaubarem Kunststoff und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
AU2000261505A1 (en) 2001-11-07
DE10020461A1 (de) 2001-10-31

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