WO2004003089A1 - Edible inks for ink-jet printing on edible substrates - Google Patents
Edible inks for ink-jet printing on edible substrates Download PDFInfo
- Publication number
- WO2004003089A1 WO2004003089A1 PCT/US2003/020030 US0320030W WO2004003089A1 WO 2004003089 A1 WO2004003089 A1 WO 2004003089A1 US 0320030 W US0320030 W US 0320030W WO 2004003089 A1 WO2004003089 A1 WO 2004003089A1
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- WIPO (PCT)
- Prior art keywords
- ink
- edible
- wax
- fat
- colorant
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Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
- A23L5/40—Colouring or decolouring of foods
- A23L5/42—Addition of dyes or pigments, e.g. in combination with optical brighteners
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21D—TREATMENT, e.g. PRESERVATION, OF FLOUR OR DOUGH, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS; PRESERVATION THEREOF
- A21D13/00—Finished or partly finished bakery products
- A21D13/40—Products characterised by the type, form or use
- A21D13/47—Decorated or decorative products
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G3/00—Sweetmeats; Confectionery; Marzipan; Coated or filled products
- A23G3/0002—Processes of manufacture not relating to composition and compounding ingredients
- A23G3/0063—Coating or filling sweetmeats or confectionery
- A23G3/0089—Coating with atomised liquid, droplet bed, liquid spray
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G3/00—Sweetmeats; Confectionery; Marzipan; Coated or filled products
- A23G3/02—Apparatus specially adapted for manufacture or treatment of sweetmeats or confectionery; Accessories therefor
- A23G3/20—Apparatus for coating or filling sweetmeats or confectionery
- A23G3/2092—Apparatus for coating with atomised liquid, droplet bed, liquid spray
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G3/00—Sweetmeats; Confectionery; Marzipan; Coated or filled products
- A23G3/34—Sweetmeats, confectionery or marzipan; Processes for the preparation thereof
- A23G3/343—Products for covering, coating, finishing, decorating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G2200/00—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF containing organic compounds, e.g. synthetic flavouring agents
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G2200/00—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF containing organic compounds, e.g. synthetic flavouring agents
- A23G2200/08—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF containing organic compounds, e.g. synthetic flavouring agents containing cocoa fat if specifically mentioned or containing products of cocoa fat or containing other fats, e.g. fatty acid, fatty alcohol, their esters, lecithin, paraffins
Definitions
- the invention is directed to fat and wax-based ink compositions for ink-jet printing on edible substrates, to methods of ink-jet printing on edibles with the inks, and to the edibles made.
- the inks and methods described herein may be employed for forming printed edible products as diverse as pharmaceutical pills and tablets to pet foods.
- the invention has particular utility for printing on confectionery, including, without limitation, chocolate bars and tableted products, jelly beans, toffees and chewing gums, and particularly for printing high resolution and high definition images on edible substrate surfaces that are difficult to print on using conventional technology.
- Such surfaces include, without limitation, the non-planar, non-porous, hydrophobic surfaces of M&M's® Milk Chocolate and Peanut Chocolate Candies, which have a sugar shell with a camauba wax polish coating.
- the present technology for printing on M&M's® Milk Chocolate and Peanut Chocolate Candies is by a contact printing process utilizing an offset roller, in what is referred to herein as rotogravure printing.
- the rotogravure system is limited in the number of colors that can be applied to a substrate. Traditionally, one color is printed, and with modifications two or three colors may be applied, but full color printing on edibles is not possible.
- the rotogravure roller is also limited in the surface area of a non planar piece that it can print. As with other contact methods of printing, there is a danger of the rotogravure roller crushing the edible articles being printed. Print designs cannot be changed or modified easily using the rotogravure method, because each new design must be engraved on a roller.
- Silk screen and pad printing although capable of forming reasonably high resolution and high definition images, cannot deliver the dots-per-inch (dpi) of ink jet systems. These systems are also limited in terms of the surface area of a substrate that can be printed, and in many cases these systems require a planar substrate. As with rotogravure printing, full color printing is not possible with silk screen or pad printing methods, and changeover of graphic designs is both time consuming and expensive.
- Another popular method for forming images on edibles, particularly on cakes and other large substrates involves using an edible transfer sheet which can be handled in a printer and which are relatively porous and hydrophilic and therefore can readily accept an image from a water-based ink, including an ink- jetted image.
- Various methods are then used to transfer the image from the sheet to an edible substrate.
- An exemplary ink for use with this type of system is disclosed in U.S. Patent Application Publication US 2002/0008751 and comprises water, isopropyl alcohol, sodium lauryl sulphate and FD&C colorant, h the transfer sheet technology, printing is not performed directly on the surface of an edible conveyed past a printhead.
- transfer sheet requires a component of the substrate to partly dissolve the sheet or to allow the sheet to adhere to the substrate.
- the transfer sheet technology is not readily adapted to the high speed production of images on non-planar surfaces of confectionery pieces.
- the water-based inks adapted for use with transfer sheets do not perform properly for ink-jet printing directly on non-planar, non-porous and hydrophobic surfaces, as they adhere poorly, dry too slowly and lack opacity.
- Ink-jet printing on edibles if the technology could be perfected, would be attractive from many vantage points. It would eliminate the need to contact the edible substrate with a contact member such as a pad or roller. Further, since ink- jet printing is a non-contact printing system, slight variations in the size of edibles would not negatively impact upon printing quality, as typically occurs with pad or roller based systems. Also, an ink-jet printer image is stored as data, and not fixed on a contact member. Consequently, images could be selected, altered, transmitted, and the like, more easily than in contact printing, opening the possibility for rapid changeover of printed designs and personalized graphics.
- Inkjet printing systems are broadly divided into continuous jet, and drop- on-demand (also called "impulse") systems in which droplets are generated as needed for ejection to the substrate surface for image formation.
- Methods of ink- jet printing on edible substrates using continuous jet technology have been disclosed. Most of these are directed to labelling and the like applications which do not require high resolution. Examples of such prior art disclosures include: U.S. Patent Nos. 4,168,662, 5,453,122, 5,006,362, 5,397,387 and 5,800,601.
- ink is emitted in a continuous stream under pressure through at least one nozzle.
- the stream is broken up into droplets at a fixed distance from the orifice, typically, by a piezoelectric crystal, which is vibrated at controlled frequency adjacent to the ink stream.
- This function of the piezoelectric element is different from the function of the piezoelectric element in a piezojet system, where the piezoelectric element controls the generation of droplets from a reservoir.
- the inks are charged (by addition of salts and other conductive agents) and the droplets are passed through an electrostatic field, which adjusts the trajectory of the droplets in accordance with data signals.
- the droplets are either directed back to a gutter for recirculation or to a specific location on the substrate to create the desired character matrix.
- a typical resolution for a continuous jet printer image in an industrial setting, using a single printhead and a single pass printing is about 75- 100 dpi.
- continuous jet inks are solvent-based, containing substantial amounts of methyl ethyl ketone (MEK) or an equivalent volatile organic compound (VOC) as the carrier, with lesser amounts of water and a lower alcohol.
- Inks for continuous ink jet systems are also characterized by the presence of salts, such as potassium thiocyanate, or other conductivity-enhancing agent, which enables the droplets to be deflected in an electrostatic field.
- salts such as potassium thiocyanate, or other conductivity-enhancing agent, which enables the droplets to be deflected in an electrostatic field.
- the conductivity of such inks is greater than about 2000 micro Siemens.
- Continuous jet inks also have a very narrow range of acceptable viscosity. Inks having a viscosity above about 10 centipoise (cp) at low shear rates cause the pumps in the printhead to cavitate during use. Below a viscosity of about 2 to about 3 cp, the jets are not stable. Thus most, if not all, continuous jet ink jet inks have a viscosity of about 2.8 to about 6 cp.
- Bubblejet printheads dominate the home and office ink-jet printer markets and they are capable of very high resolution. However, several considerations limit their use in an industrial setting, particularly their use with edible substrates.
- the viscosity of bubblejet inks is very low, on the order of 1.5 cp, necessary so that a bubble can form quickly upon application of minimal voltage to the resistance heater. Moreover, the ink must be capable of withstanding the temperature cycling encountered inside the printhead. Consequently, the number of inks which could be developed for printing on edibles with a bubblejet printer is extremely limited. Bubblejet printers are also much too slow to permit high speed printing directly on edible substrates.
- Piezojet ink-jet systems are commercially available in which the ink undergoes a phase change from a solid state to a liquid state in the printhead.
- edible wax-based inks for such printheads are not commercially available.
- the invention is a fat or wax-based ink-jettable edible ink for printing on an edible substrate comprising: a colorant, a fat or wax dispersible carrier for the colorant, and a fat or wax base.
- the carrier and fat or wax base are selected such that the ink has a viscosity in a range of about 5 centipoise to about 20 centipoise and a surface tension of less than about 50 dynes per centimeter at the conditions under which the ink is ejected from the printhead.
- the invention is a method for ink-jet printing on an edible substrate comprising the steps of: positioning an edible substrate proximate a piezojet ink-jet printhead having at least one ink reservoir; supplying to the ink reservoir an edible ink comprising a colorant, a fat or wax dispersible carrier for the colorant, and a fat or wax base, ejecting ink from the printhead in accordance with data signals onto a surface of the edible substrate to form an image consisting of individual solidified droplets of the ink and having a resolution greater than 100 dpi.
- the fat or wax-based ink is a solid at room temperature and is heated while in the printhead so that it is ink-jettable.
- the ink solidifies on the surface to form an opaque adherent droplet of solidified ink.
- the invention is an edible product made using the above inks and methods.
- the edible product comprises an edible substrate such as, without limitation, baked goods, biscuits and cakes, cookies, nuts, chocolates, cheeses, crackers and chips, pastries, puddings and mousses, ice creams and creams, petfood and pet treats, main meal snacks, cereals, and pharmaceutical tablets.
- An ink-jetted image is deposited on the edible substrate consisting of individual droplets of solidified edible ink and having a resolution of greater than about 100 dpi.
- At least one of the individual droplets comprises a fat or wax-based edible ink-jettable ink which comprises a colorant, a fat or wax dispersible carrier for the colorant, and a fat or wax base.
- the most preferred edible products according to the invention are confectionery.
- Examples include a lentil shaped confectionery piece having a sugar shell with a wax-based finish, on which an image may be ink-jet printed using the above inks having a resolution greater than 300 dpi.
- the present invention is concerned with the industrial adaptation of piezojet drop-on-demand systems, which heretofore have not been used for printing high resolution images on edible substrates.
- the designs of the printheads differ, they are all characterized by a piezoelectric device which causes ejection of ink from a reservoir, such as by a piezoelectric crystal deforming the wall of the reservoir in accordance with data signals.
- a piezoelectric device which causes ejection of ink from a reservoir, such as by a piezoelectric crystal deforming the wall of the reservoir in accordance with data signals.
- the inks used herein are solid at room temperature, it is frequently necessary to heat the printhead to allow droplets of the ink to be ejected from the printhead.
- piezojet ink-jet printhead which has a heatmg element to effect a phase change
- ink-jettable means an ink which can be ejected reliably from a piezojet printhead, without requiring excessive modification of the printhead or maintenance issues.
- a heatmg element of some type is necessary so that the fat or wax-based ink can be ejected from the printhead.
- the fat or wax base of the inks according to the invention helps the ink to form opaque adherent images on edible substrates, particularly those surfaces which are hydrophobic and therefore difficult to print on using conventional water based inks.
- the fat or wax-based inks according to the invention include a colorant which may be a dye, pigment or a lake (which is a dye attached to a particulate substrate).
- Suitable edible colorants include: the food dyes approved for human consumption under the Food, Drug and Cosmetic Act administered by the U.S.
- FD&C dyes Natural colorants derived from natural (usually vegetable) sources which are generally assumed to be safe for human consumption; colorants derived from natural sources which are FDA-approved; and synthetic colorants approved for use in non-U.S. jurisdictions.
- any of the known FD&C dyes maybe used, including without limitation, Red No. 3 (Erythrosine), Red No. 40 (Allura Red), Yellow No. 6 (Sunset Yellow FCF),Yellow No. 5 (Tartrazine), Green No. 3 (Fast Green FCF), Blue No. 1 (Brilliant Blue FCF), Blue No. 2 (fridigotine), and mixtures thereof.
- Exemplary natural colorants include, without limitation, armatto seed extract, anthocyanins (found in various berries, grapes, cabbage, and cranberries), caretenoids (found in carrots), betalins, and oleoresins (from roots such as turmeric, paprika, carmines, beet roots, and tomatoes).
- the FD&C dyes and natural colorants are water soluble, solubilizing the dyes in a carrier that is compatible with a wax poses a significant technical challenge.
- the colorants are completely solvated in the carrier such that there are substantially no colorant solids in the ink.
- the substantial absence of colorant solids in this context means less than 5.0 percent by weight solids, preferably less than 1.0 percent by weight solids.
- an FD&C dye is provided in the ink in a range of about 0.5 percent by weight up to about the solubility limit of the colorant in the carrier.
- FD&C dye is present in the fat or wax-based ink in an amount of about 5.5 percent by weight to about 35.0 percent by weight.
- Pigments and lakes may also be used as the colorant in the inks according to the invention.
- a pigment consists of fine, usually inorganic particles used to impart color when dispersed in the base. Examples of pigments include, without limitation, kaolin, chalk, titanium dioxide and aluminum hydroxide.
- a lake comprises fine particles, such as aluminum hydroxide particles bound to a colorant, such as one of the FD&C dyes or natural colorants mentioned above.
- Examples include, without limitation, FD&C Blue #1 Lake, FD&C Blue #2 Lake, FD&C Yellow #5 Lake, FD&C Yellow #6 Lake, Erythrosine Lake, Amaranth Lake, Ponceau 4R Lake, Carmoisine Lake and FD&C Red 40 Lake, all of which may be obtained from the Warner Jenkinson Company, St. Louis, Missouri.
- particles having a particle size smaller than about 50 microns should be used.
- a preferred particle size range is below 30 microns, and most preferably below 15 microns.
- the colorant particle size must be below 5 microns.
- particle size below 1 micron is desired.
- An appropriate particle size can be obtained by high shear mixing of the pigment or lake in the carrier and the fat or wax base.
- a pigment or lake it is useful to process the lakes or pigments by ball milling to particle sizes below about 1 micron, making these colorants suitable for use in fat based inks which can be ink- jetted.
- the inks according to the invention include a fat or wax base.
- Fat as used herein includes both fats and oils, either of which may be saturated or unsaturated, and may include substituted and unsubstituted hydrocarbon chains. Fat also includes “fat-like” substances such as limonenes and terpenes, and also includes lipids.
- Wax generally refers to edible waxes such as camauba wax, bees wax, and candelilla wax, which are substantially solid at room temperature. A combination of waxes may also be used.
- the fat base comprises a mixture of a fat and one or more oils.
- “Oils” is defined to mean fats that are liquid at room temperature.
- the preferred wax base material undergoes a phase change from a liquid state to a solid state upon contacting the substrate surface.
- the fats provide certain properties to the inks such as opacity, good adhesion to the substrate, and good surface chemistry for printing onto hydrophobic substrate surfaces, and the ability to print onto non porous surfaces.
- Suitable fats and waxes that can be used to make the edible inks are candelilla wax, camauba wax, bees wax, hydrogenated vegetable fats, milk fat, cocoa butter, edible fractions of mono-, di- and triglycerides and their derivatives, fats commercially available under the brand name Captex® 300 brand triglyceride, and vegetable oils.
- Colorant which is either a dye dissolved in a carrier or a pigment or lake dispersed in a carrier, is mixed with the continuous fat or wax phase in a high shear mixer, such as a Silverson mixer.
- the setting or solidifying of the fat or wax-based ink on the edible substrate surface is a phase transition from the liquid state to the solid state. It is generally preferable to avoid combined fat systems and eutectics; and ideally (in the case of fat based systems) a non- polymorphic fat system is used to ensure optimal setting characteristics for the ink.
- the colorant is dissolved or dispersed in a carrier, which is then dispersed into the fat or wax phase.
- colorant is added to the carrier in an amount close to the solubility limit of the carrier for the solvent.
- the preferred carrier system for FD&C dyes is based on one or more polyols, such as propylene glycol or glycerol.
- Other fat dispersible carriers include vegetable oils, carbohydrate solutions, sugar solutions and com syrups. It is also contemplated that the colorants can also be dispersed into water or other polar solvents prior to dispersing into the fat phase.
- the important characteristics of the carrier system are that it be able to disperse or dissolve the colorant and that it be compatible with the fat phase.
- FD&C colorant is soluble in the carrier at least to the extent of 1 gram per 100 ml, more preferably greater than 5 grams per 100 ml and most preferably greater than about 18 grams per 100 ml.
- Polyols have a good balance of fat-compatibility and solubility for most of the colorants.
- Surfactants and/or emulsifiers may be used in the ink formulation to provide a uniform and stable dispersion of the colorant and colorant carrier into the fat phase.
- Some materials that can be used for aiding the dispersions are commercially available from Quest International, The Netherlands, including the following: monoglycerides available under the tradename Myverol; acetylated monoglycerides available under the tradename Myvacet; citrogylcerides available under the tradename Admul Citrem; polysorbates available under the tradename Tween; sodium stearol lactylate available under the tradename Admul SSL; and sorbitan monostearate available under the tradename Span.
- Antifungal antimicrobial agents such as Polysorbate 80 maybe used in amounts preferably less than about 1.0 percent by weight.
- Alternative antimicrobials include, without limitation, parabens, methyl parabens, benzoates, propionates. Which may be used in amounts prescribed by regulation.
- Antifoam agents include, without limitation, simethicone emulsion, coconut oil, alcohols, and surfactants. Suitable antifoam agents may be selected from among those commercially available by one of ordinary skill and are used in the composition according to the invention in a range of about 0.1 percent by weight to about 0.5 percent by weight.
- the amount of surfactant and/or emulsifier is preferably in a range of about 0.1 percent by weight to about 5 percent by weight, preferably about 0.5 percent by weight to about 2 percent by weight, and optimally about 0.7 percent by weight to about 1.5 percent by weight.
- Preservatives, flavorants, aromatics, micro-nutrients and vitamins may all be added in customary amounts to improve the attributes of the finished confectionery.
- Wax-based inks contain surface chemistry that is compatible with candies having a wax-based coating, such as M&M's® Milk Chocolate and Peanut Chocolate Candies. These inks are ejected from the printhead in the liquid phase and they solidify on the edible substrate surface, allowing them to perform well on both hydrophilic and hydrophobic surfaces. The inks set to a solid state, adhere to the substrate surface and provide good image quality. This property allows for printing on many other food surfaces in addition to confectionery having a hydrophobic surface, including for example, potato chips, chocolates, cereals, cookies, crackers, nuts, and hard candies.
- a hydrophobic surface including for example, potato chips, chocolates, cereals, cookies, crackers, nuts, and hard candies.
- 'TNTon-conductive as used herein means a formulation that is not sufficiently conductive that droplets of the ink can have their trajectory manipulated by the electric field of a continuous jet printer to form an image on a substrate.
- Non conductive generally means an ink formulation is not continuous- jet ink-jettable. This characteristic is consistent with the substantial absence of added conductivity-enhancing salts. In addition to not being required in a drop-on- demand system, these salts can have deleterious effects on the printhead components, such as corrosion.
- Preferred inks according to the invention are characterized by the substantial absence of conductivity enhancing salts.
- an ink system should have a viscosity in the range of about 5 to about 20 centipoise.
- the ink system exhibits a viscosity in a range of about 7 to about 15 cP.
- the inks exhibit a viscosity in a range of about 10 to about 15 centipoise.
- a typical operating temperature range for a phase- change drop-on-demand piezojet printhead is about 63 °C to about 180 °C.
- the viscosity of melted bees wax at 120°C is 9.8 centipoise.
- the viscosity of melted candelilla wax at 120 °C is 11.3 centipoise.
- Ink composition and operating temperature may be varied to obtain the desired viscosity.
- Table 1 show the effect of temperature and of the relative amount of wax and fat in various compositions.
- the colorant is dispersed into the carrier and mixed, h some instances, it may be necessary to filter the carrier/colorant mixture. If a colorant is added at near the solubility limit of the carrier, then a 2.7 micron filter may be used to remove larger particle.
- Compatibility with a surface may be determined by a variety of methods. For example, a smaller contact angle made by the ink droplet on the surface is consistent with better compatibility and adhesion of the ink for the substrate. The contact angle is ideally less than about 50 degrees.
- Surface tension is also an indication of the compatibility of the ink with the edible substrate surface. Preferably the surface tension of the inks according to the invention, under the conditions at which the inks are ejected from the printhead, is less than about 55 dynes/cm, more preferably below about 50 dynes/cm, even more preferably below about 40 dynes/cm, and most preferably below 35 dynes/cm.
- the surface tension of the inks in Examples 1, 3, 5 and 6 in Table 2 above was measured with a De Nuoy ring surface tensionometer, and found to be 32.7 dynes/cm, 32.6 dynes/cm, 33.0 dynes/cm, and 33.1 dynes/cm respectively. All of these values fall within the most preferred range.
- adhesion Another measure of image quality is referred to herein as adhesion.
- an aluminum block is designed with a cavity to hold a confectionery piece.
- the piece to be tested is essentially identical to an M&M's® Milk Chocolate Candies piece, having a white sugar shell with a camauba wax coating.
- the printed piece is placed with the image facing upwards.
- An 8.5 inches (21.6 cm) long paper piece is placed on top of the candy piece such that the paper sits directly on top of the printed image.
- the paper used is Xerox® brand 4024 type copier paper.
- Another block with a groove to follow the curvature of the candy piece is placed on top of the candy piece, and aligned with the bottom block by two pins.
- a weight of 1 lb (454 g) is placed on top of the upper metal block, and the paper piece is pulled across the "image" portion of the candy piece.
- the length of the paper that is moved across the candy piece is 7.5 inches (19.1 cm) under the 1 lb (454 g) weight.
- the image is a large "m” printed with red ink.
- the image is analyzed for overall brightness using a Minolta CM-3500d spectrophotometer.
- the medium aperture sample holder is used for the analysis.
- a brightness measure "L” is made before and after the test described above.
- a high difference in brightness before and after the test (“ ⁇ L”) corresponds to poor image adhesion.
- Resolution for an ink-jet printer may be defined by the density of solidified droplets making up an image.
- Continuous jet systems are typically capable of achieving resolution of about 75 to about 100 dpi. In the context of the present invention, less than about 100 dpi is considered low resolution and greater than about 100 dpi is defined as high resolution.
- low end piezojet systems are typically capable of resolution in the range of about 100 dpi to about 150 dpi, which is defined herein as moderately high resolution.
- More advanced piezojet systems are capable of printing at 150 dpi to 300 dpi, herein defined as very high resolution which affords very good line art images, clip art images, cartoon-type images as well as text and schematic images.
- resolution of 300 dpi to 800 dpi can be achieved, which may be termed near-photographic or photographic high resolution.
- Bubblejet ink-jet technology predominantly found in the home and office printer markets, can produce images up to 1600 dpi in some cases.
- the bubblejet printheads are slow, have very small channels and require extremely low viscosity inks, which makes them unsuitable for commercial printing on edibles with a wide range of inks.
- An advantage of the methods according to the present invention is that they make possible confectionery products bearing images having a resolution greater than about 100 dpi, preferably greater than about 150 dpi and even more preferably greater than about 300 dpi, using a wide variety of inks.
- the inventors have formed ink-jet photographic likeness of individuals on M&M's® Milk Chocolate and Peanut Chocolate Candies using printheads available from Spectra, Incorporated.
- methods according to the invention involve printing of multicolor images utilizing multicolor printheads.
- a standard ink jet printhead is modified by installing a white ink reservoir and print engine where the black ink reservoir and print engine are found in a standard printhead configuration.
- the remaining print engines may be provided with wax-based inks in the customary colors (cyan, magenta, and yellow), in the ordinary configuration.
- the standard KCMY arrangement can be used, where the letters KCMY are understood to refer to white, cyan, magenta and yellow print engines, arranged in that order in the direction of print travel.
- Suppliers of suitable printing equipment include the aforesaid Spectra, Incorporated.
- images in the wax-based ink are printed using a phase change ink jet system, in which the ink is jetted in the liquid phase onto an edible substrate, where it sets almost instantly to form an opaque image.
- a phase change ink jet system in which the ink is jetted in the liquid phase onto an edible substrate, where it sets almost instantly to form an opaque image.
- These foods include, without limitation, baked goods, biscuits and cakes, cookies, nuts, chocolates, cheeses, crackers and chips, and pastries, puddings and mousses, ice creams and creams, petfood and pet treats, main meal snacks, cereals, and pharmaceutical tablets, h particularly preferred embodiments, images are printed onto sugar shelled confections having a hydrophobic wax coating, such as M&M's® Milk Chocolate and Peanut Chocolate Candies.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Nutrition Science (AREA)
- Health & Medical Sciences (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- General Preparation And Processing Of Foods (AREA)
- Confectionery (AREA)
- Medicinal Preparation (AREA)
- Ink Jet (AREA)
- Wrappers (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2489513A CA2489513C (en) | 2002-06-26 | 2003-06-26 | Edible inks for ink-jet printing on edible substrates |
AU2003247638A AU2003247638B2 (en) | 2002-06-26 | 2003-06-26 | Edible inks for ink-jet printing on edible substrates |
EP03762031A EP1551930B1 (en) | 2002-06-26 | 2003-06-26 | Edible inks for ink-jet printing on edible substrates |
JP2004549828A JP4520305B2 (en) | 2002-06-26 | 2003-06-26 | Edible ink for inkjet printing on edible substrates |
MXPA04012555A MXPA04012555A (en) | 2002-06-26 | 2003-06-26 | Edible inks for ink-jet printing on edible substrates. |
DE60315857T DE60315857T2 (en) | 2002-06-26 | 2003-06-26 | EDIBLE INKS FOR INK JET PRESSURE ON EDIBLE SUBSTRATES |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US39230302P | 2002-06-26 | 2002-06-26 | |
US60/392,303 | 2002-06-26 | ||
US45311703P | 2003-03-07 | 2003-03-07 | |
US60/453,117 | 2003-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004003089A1 true WO2004003089A1 (en) | 2004-01-08 |
Family
ID=30003236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/020030 WO2004003089A1 (en) | 2002-06-26 | 2003-06-26 | Edible inks for ink-jet printing on edible substrates |
Country Status (9)
Country | Link |
---|---|
US (1) | US7597752B2 (en) |
EP (1) | EP1551930B1 (en) |
JP (1) | JP4520305B2 (en) |
AT (1) | ATE370998T1 (en) |
AU (1) | AU2003247638B2 (en) |
CA (1) | CA2489513C (en) |
DE (1) | DE60315857T2 (en) |
MX (1) | MXPA04012555A (en) |
WO (1) | WO2004003089A1 (en) |
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CN104487094A (en) * | 2012-07-20 | 2015-04-01 | 大塚制药株式会社 | Tablet having dry-ink film on surface thereof, and ink for inkjet printer |
Also Published As
Publication number | Publication date |
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DE60315857D1 (en) | 2007-10-04 |
DE60315857T2 (en) | 2008-05-21 |
JP4520305B2 (en) | 2010-08-04 |
MXPA04012555A (en) | 2005-04-19 |
EP1551930A1 (en) | 2005-07-13 |
CA2489513C (en) | 2011-05-24 |
ATE370998T1 (en) | 2007-09-15 |
AU2003247638A1 (en) | 2004-01-19 |
JP2005531330A (en) | 2005-10-20 |
AU2003247638B2 (en) | 2009-11-26 |
CA2489513A1 (en) | 2004-01-08 |
EP1551930B1 (en) | 2007-08-22 |
US20040086603A1 (en) | 2004-05-06 |
US7597752B2 (en) | 2009-10-06 |
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