GB2539540A - Food slice de-watering method - Google Patents

Food slice de-watering method Download PDF

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Publication number
GB2539540A
GB2539540A GB1606610.2A GB201606610A GB2539540A GB 2539540 A GB2539540 A GB 2539540A GB 201606610 A GB201606610 A GB 201606610A GB 2539540 A GB2539540 A GB 2539540A
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United Kingdom
Prior art keywords
slices
water
potato
food
slice
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Granted
Application number
GB1606610.2A
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GB2539540B (en
Inventor
Louise Warburg Barbara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Frito Lay Trading Co GmbH
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Frito Lay Trading Co GmbH
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Priority to GB1606610.2A priority Critical patent/GB2539540B/en
Publication of GB2539540A publication Critical patent/GB2539540A/en
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Classifications

    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L19/00Products from fruits or vegetables; Preparation or treatment thereof
    • A23L19/10Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops
    • A23L19/12Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops of potatoes
    • A23L19/18Roasted or fried products, e.g. snacks or chips
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23BPRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00Preservation or chemical ripening of fruit or vegetables
    • A23B7/02Dehydrating; Subsequent reconstitution
    • A23B7/0205Dehydrating; Subsequent reconstitution by contact of the material with fluids, e.g. drying gas or extracting liquids
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L19/00Products from fruits or vegetables; Preparation or treatment thereof
    • A23L19/03Products from fruits or vegetables; Preparation or treatment thereof consisting of whole pieces or fragments without mashing the original pieces
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23NMACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
    • A23N12/00Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts
    • A23N12/06Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts for washing or blanching, combined with subsequent drying
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23NMACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
    • A23N12/00Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts
    • A23N12/08Machines for cleaning, blanching, drying or roasting fruits or vegetables, e.g. coffee, cocoa, nuts for drying or roasting

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Preparation Of Fruits And Vegetables (AREA)

Abstract

A method of removing water from a water-coated surface of a food slice comprises providing a belt assembly having upper and lower endless belts 16, 18, defining a product flow path 20 therebetween. Water coated food slices are fed along the product flow path wherein the path has a height which is greater than 200% of the maximum thickness of the food slices. At least one air jet is applied onto the water-containing layer to blow water from the surface of the slices. A plurality of air jets 38 are applied both upwardly and downwardly against the upper and lower surfaces of the food slices. Preferably the air jets have a velocity of from 60 to 130 metres per second. The air jet blows at least a proportion of the water-containing layer from the surface of the food slice. The method is of particular use in de-watering slices of potato after washing the slices to remove excess starch, prior to frying the slices to make potato chips.

Description

FOOD SLICE DE-ATER'METHOD This invention relates to a method of removing water from a water-coated surface of a food slice, in particular to fonn a snack food. This invention also relates to a method of producing a cooked snack food slice.
It has been known for many years to produce potato chips from slices of potato which are fried in oil, usually vegetable oil. The potato slices are cut by a cutter, typically a high speed rotary cutter. The slice thickness is typically from 1 to 1.5 mm. The cutting operation tends to produce a starch on the cut surface, which may he raw starch, suspended starch and/or an aqueous starch solution, The slices are then passed through a water bath to remove excess surface starch prior to the frying step.
The starch is removed because otherwise the starch may cause the potato chips to stick to each other during frying. Also, starch may build no in the fryer which may cause blockages or reduce the fryer efficiency or performance.
The t. l ing process may be carried out in any of a variety of devices which use cold or warm ater card agitation to separate and wash the slices (see U.S. Patent Nos, 3,223,024, 4,251,895 and 4.272.554 for exemplary processes). Coincidentally, the design.s usually provide a means whereby slices too small to be included in the commercial product are selected out, and the starch and fragments are removed as the process water is changed. Many processes also use water to cool and lubricate the slicer and/or to convey slices the slicer to the wash tank. The wash water may be filtered. to remove the starch and recycled. The wash water must eventually be discharged and replaced and must usually he treated to meet discharge permit specifications ieffluent pollution control requirements), Wash water adheres to the surfaces of the washed potato slices. If the potato slices are flied immediately after washing, this surface water may constitute a significant amount (e.g., about 15 wt%) of the total water removed by evaporation during {tying. Added water in a hot oil fryer also contributes to loss of oil due to the "steam distillation" of the oil. in a two-phase system. These effects may significantly reduce the energy efficiency of the frying process and may also reduce product quality and/or uniformity.
Potato chips exhibit specific organoleptic properties, in combination with visual appearance, to the consumer. The consumer desirous of purchasing a potato chip has a clear expectation of these product attributes in the product. There is a need for any modifications ro a potato chip frying process not to have a negative impact on the quality of the potato chips, in particular the organoleptic properties and the visual appearance.
There is a need for a method for efficiently and reliably removing surface water from a food slice prior to frying in oil, particularly in the manufacture of potato chips, ['here is also a need in the potato chip manufacturing art to provide a potato slice de-watering method which provides a lower surface water content on a potato slice which is introduced into a fryer so that a resultant potato chip is produced which has a consumer acceptance on parity with conventional fried potato chips.
The present invention accordingly provides a method of remos water from a water-coated surface of a food slice, for example to form a snack food, the method comp f; i. providing food slice having at least one surface which is coated with water-containing, layer on the food slice surface; and ii. applying at least one air jet onto the water-containing layer at air velocity at the water-containing layer of from 60 -130 metres per second to blow at least. a proportion of the water-containing layer from the surface of the food slice.
The pr; arther provides method ring water from a water-coated surface of a food slice, the method comprising the steps of; a, providing a belt assembly comprising an upper endless belt, the upper and lower endless belts defining a roduct tie diet-eh:nye feeding a plurality of water-coated food. slices along the product flow path by rotation of the upper and lower endless belts, wherein the product flow path has a height, defined between the lower and upper surfaces of the respective upper and lower endless belts, which is greater than 200% Of the T.O.aXintUril thickness of the food slices, wherein roster-coated surfaces of the food slices lorin at ast one water-containing layer on the food slice s a; and applying at least one air jet onto the water-containing layer to blow at least a proportion of the water-containing layer from the surfaces of the food slices, wherein the at least one air jet is applied to the food slices when the food slices are in the product flow path. and between the upper and lower endless belts The present invention further provides a n eilaod of pro ut a cooked snack sna:k food the method comprising the steps of: a. washing a food slice w th waterto provide at least one water-coated surface of the food slice; removing water from, the a-oated surface of th according to the method of the invention; and cooking the food slice to form a snack food.
Preferred features are defined in the depended The present o have found that the provision of sues a air et treatment, subsequent to za water washing treatment, which may be conventional, at a partiema, air flow velocity can surprisingly achieve lower free surface water content in the resultant food slice immediately prior to cooking by frying, potato slices is lowered, which can improve the energy can also improve product quality and/or uniformity when cooking by a fying process, surface water content of the ncy of the flying process and state slices are subjected to Th-present incenti n sat leaast partly predicated on the finding by the present inventor that although some free surface water can be blown by low velocity air of the surface of a water-coated food slice, such as a potato slice, low velocity air blowing alone cannot remove sufficient free surface water, because. Iliad slice has "hard to remove" free surface water on its surface. That "hard to remove" surface water can be removed by blowing the free surface water off the food slice surface using air jets at a selected air jet velocity, The air jets are controlled to provide a low free water content in the food slices so that the food slices ooked by fiyi taout excessive water evaporatio the frying process.
Embodiments of the present invention will o be described, by vvay of example only, ference to the accompanying drawings in which: figure 1 schematically illustrates a potato lice to be de.-watered in an embodiment of the method of the present invention; Figure 2 schematically illustrates the relationship between free surfac thickness and air velocity of an airjet applied M a potato slice to be de-watered in an embodiment of the method of the present invention; Figure 3 is a schematic side view of an apparatus for de-watering potato slices, prior to cooking by frying, for use in an embodiment of the method of the present invention; Figure 4 is a schematic plan view of a lower belt for use in belt assembly in an embodiment of the method of the present invention; and S is a schematic plan view of an upper belt for use in belt assembly in an embodiment of the method of the present invention, schematically illustrates a p ptato slice 2 to be de-watered in an embodiment of d of the present invention. The potato e 2 is coated with free surface water to in a water-containing surface laye. surface water is present "hard to remove-remove vhich is P i rily an interior free surface water layer and an "easy to exterior free surface water layer.
Although the present invention is described wit, reference to potato slices, the method of the invention a gloved to de-water any food slices coated with,ce water. For example, the food ay omprises slices of other vegetables, for example root vegetable such as carrot, parsnip, beetroot, sweet potato, etc. Any of these vegetable slices may be used to firm a snack food. Ahernativelyr, the food slices may be fruit slices for the manufacture of any fruit-containing food product, including purees and beverages, or snack food produced from the fruit slices.
The food slices may be planar and have opposite planar surfaces. Alternatively, the "bed slices may have a. non-planar cross-section, for example they may be crinkle cut or ridged. The food slices may have any plan shape, which may be regular, for example rectangular, square, triangular, hexagonal etc, or irregular, an example the shape of slice cut from a peeled vegetable, such as a potato, or fruit, such as an apple.
Figure 2 schematically illustrates the relationship between water. thickness and air velocity of an air jet applied to the water-coated potato slice 2 to be de-watered, The "easy to remove' fraction is;present at high film thickness, d, and can be removed by low velocity air jets. At these film thicknesses, viscous forces are dominant and the water can he removed by relatively low velocity air, optionally together with low vacuum pressure which can suck the water droplets away from the potato slice surface. However, at smaller film thicknesses, i.e. closer to the surface of the potato slice, such low velocity air is insufficient to TC110Ve the water, and such water is a "hard to remove" fraction, present inventor has found by extensive experimental research that with regard to the "hard to remove" fraction, sttr ace tension forces are dominant and that the free surface vrater can he removed by employing high velocity air jets to remove the free surface water from the su of the potato slice. The high velocity air jets remove the free surface water so that the resultant potato slice has controllably low free surface water content.
An embodiment of an apparatus for de-watering potato slices, prior to cooking by frying of the potato slices to thrrn. potato chips, according to one aspect of the method of the present invention is illustrated in Figures 3 to 5.
A primaxy endless belt conveyor 10 in the orm of a belt assembly 12 having substantially horizontal orientation is provided. An inlet end of the conveyor 10 communicates with an exit of a water flume 14 (illustrated schematically) prising part of a washing unit for the potato slices 2. The conveyor 10 carries a succession of the potato slices 2, The conveyor 10 has a translational speed of from 0A to 0.5 &second, typically about 0.2 misecand. rin outlet end 13 of the conveyor 10 communicates with an output conveyor 15 which conveys the de-watered potato slices 2 for further processing, such as cooking by frying.
The potato slices 2 have been randomly delivered onto the conveyor 10, The potato slices 2 are delivered onto the conveyor 10 in a slice distribution so as to have at least about 50% of the slices being single slices, i.e. not overlapping with an adjacent slice. In addition, at least 50% of the overlaps are no more than 50% of the area of each of the respective overlapping slices. Also, for each overlap no more than two slices 2 are stacked one upon the other on the conveyor 10. This substantially provides a monolayer of potato slices 2 across the length and width of the conveyor 10.
The potato she (53 thousandths ally have a thickness of I to 2 mtra, more typically about 1.35 m The potato sl ces 2 have been pre-treated in water in a;wishing conventionally used in potato chip manufacture to remove surface starch from the cut slice surface. After the washing step and prior to the de-watering step the potato slices 2 have about 10 to 30 wt% free surface water, typically from 15 to 25 wt%, fee surface water based on the dry weight of the final potato chip produced from the potato slice 2. In this specification the "dry weight of the final potato chip" assumes 1-2 wt%, typically about 1,5 wt%, water content in the total weight of the final cooked and dried potato chip, prior to final seasoning of the potato chip.
The belt assembly 12 cornp upper endless belt 16 and a lower endles which define a product flow path 20 therebetweem A plurality of the water-eciated potato slices 2 are fed along the product flaw path 20 by rotation of the upper and lower endless belts 16, 18. The product flow path 20 has a height, defined between the tippet and lower surfaces 22, 24 of the respective upper and lower endless belts 16, 18, which is greater than 200% of the maximum thickness of the potato slices 2. Typically, the height of the product flow path 20 is from 220 to 300% of the maximum thickness of the potato slices The upper endless belt 16 comprises a plurality f interlinke l metal links 26 having an open area of from 75 to 85% and a link depth of fro 4 to 6 rixm. Preferably, the open area is from SO to 85% and the link depth is about 5 mm, The plurality of interlinked metal links 26 form a rectangular grid structure in the upper endless belt 16.
The lower endless belt 18 comprises a plurality of interiniked metal links 28 having an open area of from 60 to 75% and a link depth of from 5 to 8 mm. Preferably, the open area is from 65 to 70©% and the link depth is about 6 mm, The plurality of interlinked metal links fern] a rectangular grid structure in the lower endless belt 18.
extend at its upstream end into a wash tank for collecting 2 thereon" ely, as illustrated a taut-het lower hell 19 is provides nds into water flume 14, or a wash tank, fiat collecting washed food slices 2 thereon and then delivers the washed food slices 2 onto the lower endless belt 18, and this embodiment provides the advantage that the lower endless belt 18 is relatively dry, and has a coating of water limited to water originating from only the food slices 2, since the lower endless belt 18 has not extended into the washing unit, As the potato slices 2 are carried on the upper surface of the conveyor 10, air is blown downwardly and upwardly onto the potato slices 2_ in a continuous manner at an air-blower station 34.
At the air-blower station 34, at least one air38 m an air jet nozzle 40 is applied, as an air knife, onto the water-containing layer at an air velocity at the water-contai of from 60 -130 metres per second. The at least one air jet 38 blows at least a proportion of the water-containing layer from the surface of the potato slices 2. Preferably, the air velocity is from -130 metres per second. The at least one air jet 38 is applied at an angle of from 75 to 105 degrees to the surface of the potato slices 2. Typically, the at least one air jet 38 is applied at a substantially perpendicular orientation to the surface of the potato slices 2, carried out onoppositema or surfaces z14, 46 of th pouts;slices with the opposite surf aces 44, 46 being treated substantially simultaneously, air jot temperature is from 20 to 100°C. The temperature of the w.a prior to air jet impact is from 10 to 40 "C, preferably from 15 to 25 'C.
treatment is carried so as to provide, after the air jet treatment, a residual free surface water content on the potato slices 2 of from 1 to less than 8 wt%, preferably from I to 5 wt%, based on the total weight of the potato slices 2, During the al.r et trcatttwrit a bulk air flow is provided le potato si droplets of water within the bulk air flow to convey the droplets aw potato slices 2. The bulk air flow is induced by suction of air away from the which is provided by at least one port (not shown.) in at least one vacuum plenum SO located ist the vicinity of the potato slices 2. In the embodiment, plural vacuum plenums 50 are provided, each opposite a respective air jet nozzle 40. The bulk air flow has an air velocity at the water-and-oil-containing, layer of from 5 -90 metres per second, for example fiom 50 to 80 rals. Typically the vacuum plenum 50 applies a negative pressure of from -20 to -120 raha example from -90 to -110 mbar. The at least one port is typically located at a distance of from S to 25 mm, for example from 8 to 15 mm, from the surfaces of the potato slices 2.
the potato slice. 2 are supported by and retained within the specifically configured belt assembly 12 which not only holds the potato slices 2 against being blows he air jet 38 but also permits water and ir transmission therethrough to ensure effective water removal.
As described above, at least one air jet 3l from art air knife i, al3plred onto the water-containing layer yes Ma from a prior washing process to blow at least a proportion of the water-containing layer from e surfaces of the potato slices 2.
The at least one air 38 is applied that otato.slices 2 when the potato slices the product flow path and between the --raid lower endless belts 16, 18. The plurality of the air jets 38 are applied both ricrwrw,fardly and upwardly against the upper and lower surfaces 44, 46, respectively, of the potato slices 2"kt least one of the plurality of air jets 38 is applied upwardly against the lower surface 45 of the potato slices 2 at an upstream location, with respect to the Bow of the potato slices 2 along product flow path, relative to at least one the plurality of air jets 38 which is applied downwardly against the upper surface 44 of the potato slices 2.
By providing that the product flow path 20 has a height, defined between the upper and tower surfaces 22, 24 of the respective upper and lower endless hells 16, 18, which is greater than 200% of the maximum thickness of the potato slices 2, in the absence of any net upward force on the potato slice 2 from an air jet causing the potato slice to be at least partially lifted off the lower endless belt 18, an upper surface of the potato slice is substantially free from contact with the upper endless belt 16. By providing essentially no or minimal contact between the upper surface of the potato slice 2 and the upper endless belt 16, this has been found to achieve an additional 4.5 wt% reduction in the water content of the potato slice 2, by removal of surface water using the air jets, as compared to constant contact of the upper surface of the potato slice 2 and the upper endless belt 16, Correspondingly, one or more lower air jets causes the potato slice to be at least partially lifted off the lower endless belt 18 at least onee,,,and this has been found to achieve an additional reduction in the water content of the potato slice 2, by removal of surface water using the air jets, as compared to constant contact of the lower surface of the potato slice 2 and the lower endless belt it 8.
After the removal of the free surface water from water-coated surfaces of the potato slices potato slices 2 arc cooked, for example by frying in oil, to forin a snack food, in this meet potato chips, In the frying cooking step, the bulk moisture content of the potato slices 2 is reduced from an average value of at least 75 wt%, typically about 80 wt%, based on the total weight of the potato slices 2 to an average final moisture content for the potato slices of 2 +/-0.5 wt% based on the dry weight of the potato chip.
The oil typically comprises a vegetable oil such as ssunflower oil, conventionally us manufacturing, potato chips. Alternatively the oil is any etabte oil, optionally at least one or a inixMite of at least two of sunflower oil, rapeseed oil and olive oil, In modifications to the illustrat-d. enxboilirtnen number of air knives n" be varied.
GB1606610.2A 2015-03-18 2015-03-18 Food slice de-watering method Active GB2539540B (en)

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GB1504563.6A GB2536625B (en) 2015-03-18 2015-03-18 Food slice de-watering method
GB1606610.2A GB2539540B (en) 2015-03-18 2015-03-18 Food slice de-watering method

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CN106723172A (en) * 2017-01-26 2017-05-31 王静龙 A kind of black soya bean screening installation
CN108142963B (en) * 2018-01-05 2020-01-24 河南科丰种业集团有限公司 Manual mushroom extrusion water trap
CN111838711B (en) * 2020-07-31 2021-08-27 义乌市义心科技有限责任公司 Draining and blow-drying equipment for agricultural product processing
CN112493508A (en) * 2020-11-25 2021-03-16 肖月发 Air-dry type hot pepper cleaning device

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US3223024A (en) * 1961-01-23 1965-12-14 Heat Control Inc Food washing and cooking apparatus
US5802959A (en) * 1995-06-07 1998-09-08 Heat And Control, Inc. Baked, non-oil containing snack product food
GB2481927A (en) * 2011-01-31 2012-01-11 Frito Lay Trading Co Gmbh Packaging containing low surface oil potato chip

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US5603973A (en) * 1995-06-07 1997-02-18 Heat And Control, Inc. Process for preparing a baked, non-oil containing snack food product
EP0893068A1 (en) * 1997-07-24 1999-01-27 Zweifel Pomy-Chips Ag Method of preparing small pieces of dehydrated potatoes
EP2946675B1 (en) * 2005-10-04 2020-05-13 JimmyAsh LLC Methods of making snack food products and products made thereby
US7993693B2 (en) * 2006-07-19 2011-08-09 Frito-Lay Trading Company Gmbh Process for making a healthy snack food
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GB2481735B (en) * 2011-01-31 2012-05-23 Frito Lay Trading Co Gmbh Bag of low surface oil potato chips
GB2481469B (en) * 2011-01-31 2013-02-13 Frito Lay Trading Co Gmbh De-oiling apparatus and method in the manufacture of low oil potato chips
JP5355738B2 (en) * 2012-03-29 2013-11-27 日清食品ホールディングス株式会社 Non-fried potato chips

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US3223024A (en) * 1961-01-23 1965-12-14 Heat Control Inc Food washing and cooking apparatus
US5802959A (en) * 1995-06-07 1998-09-08 Heat And Control, Inc. Baked, non-oil containing snack product food
GB2481927A (en) * 2011-01-31 2012-01-11 Frito Lay Trading Co Gmbh Packaging containing low surface oil potato chip

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GB2536625B (en) 2017-09-27
GB2539540B (en) 2019-09-04
WO2016146807A1 (en) 2016-09-22
GB201504563D0 (en) 2015-05-06
GB2536625A (en) 2016-09-28

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