WO2020112034A2 - Susceptor film structure for packaging used with microwave ovens and packaging comprising the said susceptor film structure - Google Patents
Susceptor film structure for packaging used with microwave ovens and packaging comprising the said susceptor film structure Download PDFInfo
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- WO2020112034A2 WO2020112034A2 PCT/TH2019/000058 TH2019000058W WO2020112034A2 WO 2020112034 A2 WO2020112034 A2 WO 2020112034A2 TH 2019000058 W TH2019000058 W TH 2019000058W WO 2020112034 A2 WO2020112034 A2 WO 2020112034A2
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- Prior art keywords
- packaging
- layer
- film structure
- polymer substrate
- percent
- Prior art date
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 67
- 239000010408 film Substances 0.000 claims abstract description 98
- 229920000307 polymer substrate Polymers 0.000 claims abstract description 63
- 239000011104 metalized film Substances 0.000 claims abstract description 37
- 239000010410 layer Substances 0.000 claims description 114
- 235000013305 food Nutrition 0.000 claims description 35
- 239000000853 adhesive Substances 0.000 claims description 20
- 230000001070 adhesive effect Effects 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 16
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 16
- -1 polyethylene terephthalate Polymers 0.000 claims description 14
- 239000012790 adhesive layer Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- OGSYQYXYGXIQFH-UHFFFAOYSA-N chromium molybdenum nickel Chemical compound [Cr].[Ni].[Mo] OGSYQYXYGXIQFH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000003851 corona treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000010955 niobium Substances 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 238000009832 plasma treatment Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 239000011135 tin Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229920006254 polymer film Polymers 0.000 description 7
- 238000010030 laminating Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 235000015108 pies Nutrition 0.000 description 5
- 239000011800 void material Substances 0.000 description 5
- 235000008429 bread Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 241001137251 Corvidae Species 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 235000021487 ready-to-eat food Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 235000015173 baked goods and baking mixes Nutrition 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 235000015228 chicken nuggets Nutrition 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000014594 pastries Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
- B32B2307/736—Shrinkable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Definitions
- microwave ovens to heat or to cook foods. This leads to more convenience, particularly, for use with ready-to-eat foods which requires less time to heat when compared to the time required for fresh cooking.
- heating food in a microwave oven is considered as a closed system which normally makes food being dry from vaporized moisture then food becomes crispy such as baked breads and pies.
- condensed water inside a microwave rewets the surface of such foods thereby reducing the intended crispiness.
- packaging having a structure or composition of susceptor film which comprises a substrate layer, generally made from paper, and a metalized film layer such as polyethylene terephthalate.
- the said packaging may have holes positioned partially on the packaging used to allow steam to vaporize from the packaging or have material layers which can absorb moisture from the food being heated in the microwave ovens.
- the PCT application publication number W02010/033561 A2, disclosed the structure of paper packaging used for heating dough bakery products in microwave ovens.
- the box and the wall parts of the said packaging were made from susceptor which is microwave interactive material having the thickness of 100 angstroms and optical density of approximately 0.15 to 0.35.
- the said packaging structure made from paper has a disadvantage in which the packaging is not firmly closed to the food. When heating the food, the heat may not be uniformly distributed and there may be certain areas that are not crispy or brown when compared to other areas.
- U. S. patent No. 5,177,332 disclosed wrapping material having a layered structure for wrapping food to be heated in microwave ovens in order to make the food crispy and the food surface brown.
- the wrapping materials contained heat-stable and heat-resistance film layers. Both layers could be made from polyethylene terephthalate. The thickness of each layer started from
- U. S. patent no. 9,073,689 disclosed the microwave interactive structure comprising support film laminated to the polymer film via tie layer, susceptor film, and adhesive layer.
- a blowing agent in the tie layer for creating an air space in the said layer when heated susceptor packaging in a microwave oven Because moisture in the supporting layer being heated and evaporated by susceptor and causing the gas in the adhesive layer.
- the said air space created in the tie layer may affect and reduce the strength of the adhesions between layers thereby leading to the delamination of each layer.
- the above example inventions do not intend to develop susceptor film structures that can be effectively used and still maintain the good external appearance of film susceptor. Specifically, when reheated food in a microwave oven, the foods obtained from the procedure are crispy with suitable browning surfaces, not soggy or soaked wet. Moreover, the susceptor film has less shrinkage after heated in a microwave oven.
- the objective of this invention is to provide susceptor film structure for packaging to be used with microwave ovens and packaging comprising the said susceptor film structure that can solve the issue of non-closed contact with food and the loss of crispiness of the food surface when heated in microwave ovens.
- the susceptor film structures according to this invention are firmly closed to the food surface. This allows consistent heat transfer thereby making food surfaces uniformly crispy, making the texture dried, and not soggy or soaked wet.
- the other obj ective of this invention is to provide the susceptor film structure having good dimensional stability without distortion or shrinkage or being shortened when used with microwave ovens. More specifically, the size of susceptor film structure does not change or slightly changes without affecting the external appearance of the said film or causing the same to be unacceptable.
- the ability to maintain the dimension of susceptor film structure leads to have the good appetizing packaging having the said film structure even when used with microwave ovens. Thus, this will promote the products’ image, create customer satisfaction and enhance the increasing sale volume.
- One aspect of this invention is related to susceptor film structure for packaging used with microwave ovens comprising at least one metalized film layer laminated to at least one polymer substrate layer characterized in that the said polymer substrate layer has the structure containing a number of voids in the range of 8 to 30 percent by volume and the thickness of film structure in the range of 75 to 150 micrometers.
- the other aspect of this invention is related to packaging used with microwave ovens comprising at least one metalized film layer laminated to at least one polymer substrate layer characterized in that the said polymer substrate layer has the structure containing a number of voids in the range of 8 to 30 percent by volume and the thickness of film structure in the range of 75 to 150 micrometers.
- Susceptor film structure and packaging according to this invention can be used with various types of food products such as bakery or baked dough product or ready-to-eat food which require a dried crispy food texture without soggy or soaking wet when reheated in microwave ovens.
- Figure 1 shows the cross- sectional view of the example of susceptor film structure according to one embodiment of this invention.
- Figure 2 shows the cross- sectional view of the example of susceptor film structure according to the other embodiment of this invention.
- Figure 3 shows the shrinkage of the example of susceptor film structure after being heated with a microwave oven.
- Figure 4 shows graph demonstrating the shrinkage of susceptor film structure according to one embodiment of this invention and the comparative examples.
- Any equipment, apparatus, method, material, or chemical substance described herein, except otherwise specified, means equipment, apparatus, method or material or chemical substance commonly used or operated by persons skilled in the arts.
- structure having a number of voids refers to the characteristic of polymer substrate having a number of voids which cover a plurality of cavity, pore, porous infiltrated in the polymer texture. Such voids may have the same or different shapes or patterns without limitation. Such voids may also be connected or separated without connections.
- One aspect of this invention is related to susceptor film structure for packaging used with microwave ovens comprising at least one metalized film layer laminated to at least one polymer substrate layer characterized in that the said polymer substrate layer has the structure containing a number of voids in the range of 8 to 30 percent by volume and the thickness of film structure in the range of 75 to 150 micrometers.
- Susceptor film structure according to this invention has a number of voids in the range of 8 to 30 percent by volume. This provides good effects to the property of susceptor films when the said films are used for packaging. Such effects include the ability to maintain dimension when heated in microwave ovens without too much shrinkage or distorting or damaged when heated.
- a number of optimum voids in the polymer substrate structure affects the thermal resistance and strength properties of the susceptor film structure; more specifically, in the case that the polymer substrate does not have the structure containing a number of voids, when heated, the said susceptor film structure will shrink to the extent that the shrinkage is too much and the package cannot be acceptable.
- polymer substrate having a number of voids that is too low such as less than 8 percent by volume, will not affect the original strength or provide a slight increase to the original strength of susceptor polymer structure thereby making the susceptor film structure shrink and unable to maintain the shape when used at high levels of heat.
- Such film structure therefore cannot be used as intended.
- a number of voids in the polymer substrate structure is too high, for example, more than 30 percent by the volume, it will reduce the strength of susceptor film structure and easily cause a poor bonding and delamination, particularly, when a number of voids in the polymer substrate structure is significantly high such as more than 50 percent by volume. This will significantly reduce the strength of susceptor film structure.
- the susceptor film structure will become cracking, easily debonding, and not able to support the weight of products or corresponding force caused by the said products intended to be contained and heated.
- Susceptor film structure according to this invention has the suitable unrestrained linear shrinkage in the machine direction (MD) in the range of 1.2 to 3.0 percent and in the transverse direction (TD) in the range of 1.2 to 2.2 percent when measured at the temperature of 140 to 160 degree Celsius for 30 minutes according to ASTM D 2732-96.
- Suitable polymer substrate layer according to this invention has thermal shrinkage in the machine direction (MD) less than 1.5 percent and in the transverse direction (TD) less than 1.2 percent when measured at 150 degree Celsius for 30 minutes according to ASTM D 2732-96.
- Susceptor film structure may comprise at least one skin layer laminated to polymer substrate layer wherein the said skin layer has the thickness in the range of 2 to 10 micrometers, preferably, 4 to 9 micrometers.
- the skin layer may be performed with the addition of additives, corona treatment, or plasma treatment.
- polymer substrate layer and skin layer are made of polyethylene terephthalate.
- metalized film layer has the optical density in the range of 0.2 to 0.4, preferably 0.3 to 0.4 and has unrestrained linear shrinkage in the machine direction
- MD less than 2.2 percent and in the transverse direction (TD) less than 0.4 percent when measured at 150 degree Celsius for 30 minutes according to ASTM D1204.
- Metalized film layer comprises films metalized with metal selectable from aluminum, chromium, copper, iron, magnesium, nickel, stainless steel, tin, titanium, tungsten, nickel- chromium-molybdenum alloy with niobium, oxide metal or combination thereof
- metalized film layer is biaxial oriented polyethylene terephthalate metalized with aluminum.
- susceptor film structure comprises at least one adhesive layer which adheres metalized film layer and polymer substrate layer together and/or adheres each polymer substrate layer together and/or adheres each metalized film layer together.
- Adhesive layer according to this invention is the water-based acrylic emulsion adhesive, water- based acrylic pressure sensitive adhesive, or polyurethane adhesive.
- adhesive layer is a water-based acrylic emulsion adhesive or polyurethane in which the weight of each layer is in the range of 2 to 30 grams per square meter.
- the weight of each layer is in the range of 10 to 25 grams per square meter.
- Susceptor film structure according to this invention is, preferably, susceptor film structure for food packaging used with microwave ovens and food that contains water in the range of 35 to 65 percent by weight.
- Figures 1 and 2 show the examples of the arrangement of susceptor film structure according to this invention.
- Figure 1 shows the examples of susceptor films structure according to the first embodiment which comprises skin layer 1 laminated to polymer substrate layer 2 having a number of voids 3, adhesive layer 4 and metalized film layer 5 laminated to metal layer 51 metalized on polymer film surface 52.
- Figure 2 shows the examples of susceptor film structure according to second embodiment which comprises two polymer substrate layers 2, each laminated to surface layer 1 and having adhesive layer 4 positioned between said surface layer 1 and metalized layer 5 comprising metal layer 51 which is metalized on surface of polymer film 52 with the adhesive layer 4 arranged between surface layer 1 and metalized layer 5 for adhering two layers together.
- the second embodiment is related to the packaging for use with microwave oven which comprises susceptor film structure having the special characteristics as described above.
- Packaging according to this invention contains a seal with a steam venting port to release steam occurred during warming or heating using microwave ovens or forming as a sleeve with the opening port or opening ends to release steam occurred during warming or heating using microwave ovens.
- Packaging according to this invention can be used with food products and various bakery or dough baked products that require crispy foods surface and textures that are drier and not soggy after being heated in microwave ovens.
- the examples of such products include cooked foods such as chicken nuggets and bakery, breads, pies, pastry. More specifically, this invention is suitable for food having water in the amount of 35 to 65 percent by weight.
- the experiment was conducted to compare the performances of susceptor film structures in respect to quality of food after being heated in microwave ovens.
- the experiment was conducted using the sample metalized film layer made of biaxial oriented polyethylene terephthalate which was metalized with aluminum and skin layer and polymer substrate layer which were made of polyethylene terephthalate.
- the adhesive being polyurethane (sample No. 2), water based acrylic emulsion adhesive (sample No. 3) and water-based acrylic pressure sensitive adhesive ( sample No. 4) were the suitable adhesives as they were able to provide good adhesion between the metalized film and the polymer substrate layer, even after being heated by microwave ovens.
- the study was conducted by laminating the sample metalized film sheet having various levels of optical densities to the substrate layer being polyethylene terephthalate using water based acrylic emulsion adhesive. Thereafter, the sample sheets prepared were used for wrapping bread coated with butter on both surfaces and the said wrap was heated by a microwave oven using the power of 850 watts for 75 seconds. The results of the experiment are shown in Table 3.
- the cross-sectional image was used for calculating the void areas by comparing the areas of all the polymer substrate samples.
- the calculation of the void areas in the polymer substrate was conducted by using the image analysis techniques having the following procedure
- the sample polymer substrate according to this invention had a number of voids in the polymer substrate structure in the range of 10 to 20 percent by volume.
- the experiment was conducted to compare the properties in the aspects of food quality and the ability to maintain the dimension of the susceptor film structure or packaging when heated in microwave ovens.
- the comparisons at various thicknesses of polymer substrate layer were made between the susceptor film structure or packaging comprising polymer substrate layer in the type of polyethylene terephthalate having structure containing a number of voids according to this invention and the susceptor film structure or packaging comprising polymer substrate layer in the type of polyethylene terephthalate without the structure containing a number of voids.
- Preparing sample susceptor film structure consisted of a metalized film sheet (mPET) having the OD of 0.30-0.38 and the thickness of 12 micrometers laminating to a polymer substrate sheet in the type of polyethylene terephthalate (PET) according to this invention which contains a number of voids (sample No. 1-3 in the Table 5) or the polymer substrate sheet being comparative examples without having a number of voids in the structure (sample No.4 and 5 in the Table 5) by using water-based acrylic emulsion adhesive and drying in the temperature of 100- 110 degree Celsius.
- Two types of multilayer susceptor film lamination structure are. Type PET//mPET Laminating polymer film substrate layer to the metalized film layer with adhesives
- Type PETl//PET2//mPET Laminating the first polymer film substrate layer to the second polymer film substrate layer using adhesives and laminating the second polymer film substrate layer to the metalized film layer with adhesives.
- the unrestrained linear shrinkages of the sample susceptor films according to the table 5 were measured both in the machine direction (MD) and the transverse direction (TD) at the temperatures between 140-160 degree Celsius and the experimental results are shown in the table 6 and the figure 4a, 4b.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TH1801007294A TH1801007294A (en) | 2018-11-27 | Susceptor film structure for packaging used in microwave ovens And packaging consisting of such a composite film structure | |
TH1801007294 | 2018-11-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2020112034A2 true WO2020112034A2 (en) | 2020-06-04 |
WO2020112034A3 WO2020112034A3 (en) | 2020-09-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/TH2019/000058 WO2020112034A2 (en) | 2018-11-27 | 2019-11-08 | Susceptor film structure for packaging used with microwave ovens and packaging comprising the said susceptor film structure |
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WO (1) | WO2020112034A2 (en) |
Family Cites Families (8)
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---|---|---|---|---|
EP0389274B1 (en) * | 1989-03-22 | 1994-07-13 | Alcan International Limited | Optical interference structures incorporating porous films |
EP0818126B1 (en) * | 1995-03-29 | 2000-04-19 | Minnesota Mining And Manufacturing Company | Electromagnetic-power-absorbing composite |
CA2577150C (en) * | 2004-08-25 | 2010-02-23 | Graphic Packaging International, Inc. | Absorbent microwave interactive packaging |
US9073689B2 (en) * | 2007-02-15 | 2015-07-07 | Graphic Packaging International, Inc. | Microwave energy interactive insulating structure |
US9000339B2 (en) * | 2010-03-29 | 2015-04-07 | Graphic Packaging International, Inc. | Microwave heating apparatus with food supporting cradle |
US8263918B2 (en) * | 2010-07-16 | 2012-09-11 | Nordenia Usa Inc. | Microwave packaging |
DE102010033466B4 (en) * | 2010-08-05 | 2012-11-08 | Sig Technology Ag | Packaging container made of a sheet-like composite with improved adhesive and inner layer combination |
CN103652597A (en) * | 2012-09-20 | 2014-03-26 | 日清富滋株式会社 | Packaged frozen noodle used for microwave thawing |
-
2019
- 2019-11-08 WO PCT/TH2019/000058 patent/WO2020112034A2/en active Application Filing
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