KR102158869B1 - Film for microwave oven - Google Patents

Abstract

In the present invention, in the film for a microwave oven, the film includes an upper layer of 11 to 19 μm thick nylon, a middle layer of 35 to 45 μm polypropylene (PP), and a lower layer of 35 to 45 μm thick polyethylene (PE). It is co-extruded by three-stage dies and sequentially laminated, and the upper and middle layers are bonded with an epoxy adhesive to form an adhesive layer, and the middle and lower layers are not electrically conductive with epoxy adhesives, and are ceramic powders with a particle size of 300 to 400 mesh, 100 weight of adhesive A heat-resistant adhesive layer adhered by a mixture of heat-resistant additives consisting of 2 to 8 parts by weight per part is formed; The adhesive block is located between the first discharge port and the second discharge port in front of the three-stage dies, and an adhesive block for discharging the epoxy adhesive is configured, and the adhesive additive supplier is an epoxy located between the second and third discharge ports in front of the three-stage dies. An adhesive additive block for discharging a mixture of an adhesive and a heat-resistant additive is configured; Even if the packaging is cooked in a microwave oven by making a packaging bag with a film, it is not stretched.After cooking, the packaging bag has a good appearance, no scratches during storage and transportation, has good flexibility and strength, and is a suction phenomenon by the packaging. There is an effect such as that this does not occur.

Description

Microwave oven film {FILM FOR MICROWAVE OVEN}

The present invention relates to a film for a microwave oven, wherein a film for a microwave oven for packaging frozen foods heated in a microwave oven before ingestion is prepared by attaching nylon, polypropylene (PP), and polyethylene (PE) to an adhesive in a three-stage die. The present invention relates to a microwave oven film having good packaging flexibility, strength, and appearance by sequentially laminated production with heat-resistant additives.

Synthetic resins are generally lightweight, have good water resistance, chemical resistance, electrical insulation, and mechanical properties, and are easy to process, so they are widely used as food packaging materials, building materials, electrical/electronic/home appliances materials, automobile materials, and textile materials. have.

Stretch films with excellent transparency, flexibility and heat sealing properties are widely used in the packaging of the above food packaging, especially fresh foods packaging meat, fresh fish, fruits and vegetables, and the food packaging film is a polyvinyl chloride resin with an adipic acid ester plasticizer. A film comprising a polyvinyl chloride-based resin composition in which and various antifogging agents are blended is generally used.

The prior art for producing a food packaging film based on the polyvinyl chloride is manufactured by the hydrogen peroxide method with respect to 100 parts by mass of a chlorine-containing resin such as a polyvinyl chloride resin in Patent Document 1, and has a peroxide value of 13 or less. A food packaging material is disclosed in which an epoxidized soybean oil containing no phosphorus antioxidant is blended in a ratio of 1 to 50 parts by mass.

The technology disclosed in Patent Literature 1 is not suitable for use in packaging food and is not suitable for use in packaging food because the epoxidized soybean oil is a natural plasticizer or soybean oil bleed out to the film surface is solidified and the film surface is whitened and damages the appearance. In some cases, the appearance of the film may be defective.

As described above, there is a demand for a film for food packaging that requires not only packaging flexibility but also a good film appearance.

Japanese Unexamined Patent Publication No. Hei 8-27341

The present invention was created in order to solve the above problems, and a microwave oven film for packaging frozen foods heated in a microwave oven before consumption was prepared in a 3-layer die with nylon as the upper layer, and polypropylene (PP) as the middle layer, The lower layer is extruded so that polyethylene (PE) is laminated in sequence at the same time, nylon and polypropylene (PP) are simultaneously bonded with an epoxy adhesive, and polypropylene (PP) and polyethylene (PE) are bonded to the epoxy adhesive and heat resistance without electrical conductivity. An object thereof is to provide a film for microwave ovens having good packaging flexibility, strength, and appearance by simultaneously bonding with an additive.

In the present invention, the film is sequentially laminated by simultaneous extrusion of the upper layer of nylon, the intermediate layer of polypropylene (PP), and the lower layer of polyethylene (PE) by a three-stage die, and the upper layer and the intermediate layer are adhered with an epoxy adhesive. The resulting adhesive layer is formed, and a heat-resistant adhesive layer in which the middle layer and the lower layer are adhered by a mixture of an epoxy adhesive and a heat-resistant additive is formed.

In addition, in the present invention, the upper layer thickness is 11 to 19 μm, the middle layer thickness is 35 to 45 μm, and the lower layer thickness is 35 to 45 μm.

In addition, in the present invention, the heat-resistant additive is a ceramic powder having no electrical conductivity and is composed of 2 to 8 parts by weight per 100 parts by weight of the adhesive.

In addition, in the present invention, the front side of the three-stage die is configured with an adhesive supply unit including an adhesive block positioned between the first discharge port and the second discharge port, and an adhesive additive block positioned between the second discharge port and the third discharge port. Consisting of an adhesive additive supplier is configured.

In addition, the present invention is configured in front of the three-stage dies, a heater is configured to raise the internal air therein, and a hot air dryer configured with a blower configured to transfer the air heated by the heater.

The packaging bag is made of a film composed of an upper layer of nylon, an intermediate layer of polypropylene (PP), and a lower layer of polyethylene (PE) of the present invention. Even if the package is cooked in a microwave oven, it is not stretched. The envelope has a good effect.

In addition, in the present invention, if the packaging bag is manufactured according to the dimensions of the upper layer thickness of nylon, the intermediate layer thickness of polypropylene (PP), and the lower layer thickness of polyethylene (PE), the frozen food is packaged and scratched during storage and transportation. It does not occur, has good flexibility and strength, and has the effect of not causing a suction phenomenon by the packaging.

In addition, the present invention has the effect of not causing thermal deformation when cooking frozen food in a microwave oven by the heat resistant additive of ceramic.

In addition, in the present invention, since the thermal additive has no electrical conductivity, it can be used in a microwave oven.

In addition, the present invention has the effect of not causing problems with respect to the environment and the like generated in the adhesive by the epoxy adhesive.

In addition, the present invention has the effect of removing moisture from the film by the hot air dryer in front of the three-stage die.

Figure 1: Partial perspective view of the present invention.
Figure 2: A plan view of an extrusion molding machine producing the present invention.
Figure 3: A perspective view of the molding unit of the extrusion molding machine for producing the present invention.
Figure 4: A cross-sectional view of the molding unit and hot air dryer of the extrusion molding machine for producing the present invention.

Hereinafter, a preferred embodiment of the vinyl for a microwave oven according to the present invention will be described with reference to the accompanying drawings.

A general microwave oven is a kitchen appliance that heats a cooking object by generating a 2450 MHz microwave emitted from a magnetron using electricity in the body, penetrating the package, and causing molecular motion inside the package. Accordingly, it is widely used because of the advantages of significantly shortening the cooking time of the package, reducing the loss of nutritional value in the process of cooking, thawing, and heating the package, and cooking the package directly in the state of storing and packaging the package.

In general, disposable containers used in microwave ovens consist of a container of a certain size that can accommodate food made of synthetic resin, that is, a cover made of transparent synthetic resin, to accommodate food in the inner space of the container and seal the cover by heat bonding. It is distributed in the general market in the state.

In addition, general frozen foods are distributed in sealed packaging so that they do not come into contact with air or oxygen, and accordingly, oxidation and spoilage of the packaging contained in the packaging can be effectively prevented, and sealed for cooking or eating frozen foods. When a frozen food is heated in a microwave oven in a packaged state, the film surface is stretched as the package is cooked, resulting in a poor appearance of the film, which visually reduces the willingness to consume the food.

In the present invention, the upper layer 11 is nylon, the middle layer 12 is polypropylene (PP), and the lower layer 13 is a multilayer of polyethylene (PE), and the interlayers are made of an adhesive of the adhesive layer 14 or It is a film 10 that can be used in microwave ovens for packaging frozen foods bonded with an adhesive mixed with a heat resistance additive of the heat-resistant adhesive layer 15.

The film 10 of the present invention includes a first extruder 20 for melting the first molten resin (a), a second extruder 30 for melting the second molten resin (b), and a third molten resin (c). It is produced by a three-stage die 60 that melts and discharges the synthetic molten resin melted and discharged by the third extruder 40 that melts into a film shape, and is produced by a three-stage die 60 by nylon, polypropylene (PP). , Polyethylene (PE) is co-extruded so that the upper layer 11 is laminated with nylon, the middle layer 12 is polypropylene (PP), and the lower layer 13 is laminated with polyethylene (PE). The adhesive of the adhesive layer 14 or the heat-resistant additive of the heat-resistant adhesive layer 15 are adhered by a mixed adhesive to form a single film 10.

The nylon has excellent heat resistance, abrasion resistance, high transparency, high stiffness, high elasticity and physical properties, is thin, light, tough, and resistant to contamination, so it is widely used for mountaineering clothing, materials for various mountaineering equipment, or industrial parts. It is immersed within about 20 to 40 minutes to prevent deformation of physical properties or dimensions due to moisture absorption during use, and improves properties such as toughness of molded products by annealing effect.

Polypropylene (PP) has excellent chemical resistance, mechanical properties, and thermal properties, so it is used for packaging films, stretched tapes, fibers, pipes, general goods, toys, industrial parts, containers, etc., and consists of only carbon and hydrogen. This is excellent, and its melting point is 150~160℃, and it can be used continuously at 110℃ with a 4.5kg load.

The polyethylene (PE) has excellent electrical properties, mechanical properties and processability, and is used in a wide range of fields due to its relatively inexpensive price. The density varies depending on the polymerization method, and according to the density, low density polyethylene (LDPE), medium It is classified into MDPE (Medium Density Polyethylene), HDPE (High Density Polyethylene), Cross Linking Polyethylene (XLPE), and Metallocene Polyethylene (mPE).

In order to maintain the exterior state of the frozen food while the film is not stretched when the sealed frozen food is cooked in a microwave, as well as the packaging flexibility during the sealed packaging and distribution of the frozen food, a packaging bag for frozen food is provided with the film sheet of the present invention. In the case of production, the outer surface of the packaging bag is composed of nylon (nylon) of the upper layer (11), the inner surface of the package contacting is composed of polyethylene (PE) of the lower layer (13), and the middle layer (12) is composed of polypropylene (PP). Make up.

Since the packaging bag in which the frozen food is packaged is brought into contact with external objects or packaging materials during transport and storage, damage to the surface of the packaging bag occurs, the present invention packs frozen food and can be used in a microwave oven to prevent this phenomenon. Microwave oven film 10 is composed of abrasion resistance, rigidity, high elasticity, thin, light, tough, and highly resistant to contamination, on the upper layer of the film, and polyethylene (PE) is a film ( It consists of the lower layer 13 of 10), and the polypropylene (PP) excellent in mechanical and thermal properties while not being stretched when cooked in a microwave oven while the package is packaged is the intermediate layer 12 of the film 10 It is composed of a film that has the flexibility of packaging and strength of the packaging bag when stored and transported, while the appearance of the packaging bag is good after cooking.

The film 10 is cut into a predetermined size and heat-sealed to form a packaging bag for packaging frozen foods, or a pouch for packaging health foods or beverages.

The upper layer 11 of the nylon has a thickness of 11 to 19 μm, the intermediate layer 12 of polypropylene (PP) has a thickness of 35 to 45 μm, and the lower layer 13 of polyethylene (PE) has a thickness. When the packaging bag of the present invention is made of 35 to 45 μm, scratches do not occur during storage and transport by packaging frozen food, the flexibility and strength are good, and the phenomenon of suction by the package does not occur.

When the packaging bag of the present invention is manufactured, if the thickness of the upper layer 11 of the nylon is 11 μm or less, scratches occur during storage and transport by packaging frozen food, and the frozen food is warmed in a microwave oven in a packaged state. In the case where the film's appearance is distracted and the thickness of the upper layer (11) is more than 19㎛, scratches during storage and transportation of frozen food, and the case of heating in a microwave oven while the frozen food is packaged, distract from the exterior of the film. Although it does not occur, the unit price is increased due to the thickness more than necessary, and if the thickness of the polypropylene (PP) layer 12 is 35 μm or less, the flexibility of the packaging bag is good, but the strength decreases and the thickness of the layer layer 12 is 45 μm or more. In this case, the strength of the packaging bag is good, but the flexibility is deteriorated. If the thickness of the lower layer 13 of polyethylene (PE) is 35 μm or less, a suction phenomenon occurs by the package, and if the thickness of the lower layer 13 is 45 μm or more, the packaging material No draining phenomenon occurs due to.

As nylon, polypropylene (PP), and polyethylene (PE) are co-extruded by the three-stage die 60, nylon and polypropylene (PP) are adhered with epoxy bonding, Propylene (PP) and polyethylene (PE) are bonded together with a mixture of an epoxy adhesive and a heat resistant additive.

The film is formed between the upper layer 11 and the middle layer 12, that is, an adhesive layer 14 for bonding nylon and polypropylene (PP) with an epoxy adhesive, between the middle layer 12 and the lower layer 13, That is, a heat-resistant adhesive layer 15 is configured to bond polypropylene (PP) and polyethylene (PE) with a mixture of an epoxy adhesive and a heat-resistant additive.

The epoxy adhesive is a liquid thermosetting resin-based adhesive. The upper layer 11 and the lower layer 13, that is, nylon and polypropylene (PP) are bonded to each other so that no peeling phenomenon occurs therebetween. By adhering propylene (PP) and polyethylene (PE), separation between layers of the microwave oven film sheet is prevented without causing peeling between them.

The epoxy adhesive is a thermosetting resin-based adhesive made of epoxy resin and is widely used for bonding steel, copper, wood, and various plastics, and has excellent mechanical properties due to its very good adhesion after curing, and has strong adhesion, heat resistance, and electrical insulation properties. Since it is excellent and cured at room temperature and has no by-products upon reaction, there is no harm to packaging of frozen food even if it is used as an adhesive for the upper layer 11 and lower layer 13 of the film 10.

The microwave oven film must have heat resistance due to heat when cooking frozen food in a microwave oven, and must not undergo heat deformation, and the risk of fire due to sparks that may be generated by microwaves. In order to prevent electrical conductivity, the heat-resistant additive is made of ceramic suitable for this property.

The ceramic is an additive added to the epoxy adhesive used in the heat-resistant adhesive layer 14, and is a powder having a particle size of 200 to 600 mesh, preferably a powder having a particle size of 300 to 400 mesh, consisting of 2 to 8 parts by weight per 100 parts by weight of the adhesive. do.

When the heat-resistant additive, i.e. ceramic, is 2 parts by weight or less per 100 parts by weight of epoxy adhesive, heat deformation occurs due to heat when cooking frozen food in a microwave, and heat deformation does not occur when it is 5 parts by weight or more, but for microwave ovens. As a film, it has more than necessary strength.

The powder of the ceramic particle size in the range of 200 to 600 mesh can be made with a general grinder, and when the particle size of the ceramic is 200 mesh or less, a packaging bag for a microwave oven made of film 10 is heat resistant when cooking frozen food in a microwave oven. Thermal deformation may occur due to When considering the thickness of the epoxy adhesive, the particle diameter of the powder is large, resulting in poor surface roughness on the film 10. In the case of more than 600 mesh, heat resistance and workability are good, but the processing cost is high because ceramics must be specially crushed. do.

The ceramics include phyllite, quartz, muscovite, sericite, biotite, and chlorite. ), chloritoid, garnet, albite, albite, sphene, apatite, zircon, sodium oxide It is composed of one or more of sodium oxide, titanium dioxide, zirconia, and silicon nitride.

The general method of manufacturing a synthetic resin film is to supply synthetic resin chips, which are raw materials for melting resin, to the hopper of an extrusion molding machine, melt the synthetic resin chips at 160~220℃ by a heater, and then extrude the molten resin with a cylinder and an extrusion screw, and use a three-stage die ( 60), discharged to the outside from the three-stage die 60, cooled by the blowing air of the air ring, and finally wound on a rotating reel to form a roll film.

The extruder for molding the film 10 is composed of an extruder and a molding unit 40, and the extruder melts the resin and transfers it under pressure to the molding unit 50, and the first extruder 20, the second extruder 20 And a third extruder 30.

When the nylon chips are put into the hopper 21 of the first extruder 20, the chips are melted by the heat of the heater in the transfer unit 22 to become the first molten resin (a), and the first molten resin (a) ) Is extruded into the molding unit 50 by the screw of the transfer part 22, and when the chips of polypropylene (PP) are put into the hopper 31 of the second extruder 30, the chips are transferred from the transfer part 32 to the heater. It is melted by heat to become a second molten resin (b), and is extruded into the molding unit 50 by the screw of the transfer unit 32, and the chips of polyethylene (PE) are put into the hopper 41 of the third extruder 40 The lower chip is melted by the heat of the heater in the transfer part 42 to become a third molten resin (c), and is extruded into the molding unit 50 by the screw of the transfer part 42.

The first, second, and third molten resins (a, b, c) melted in the first, second, and third extruders (30, 40, 50) are each formed into a molding unit (50), and then into a three-stage die (60). The first melted resin (a) becomes the upper layer 11 of the film 10 and the second melted resin (b) becomes the middle layer of the film 10 as it is laminated to one as it is introduced and discharged and formed into a three-layer film 10. (12), and the third molten resin (c) becomes the lower layer 13 of the film 10.

The molding unit 50 is formed with an outlet block 51 consisting of a three-layer outlet passage in communication with the outside, and the upper outlet passage communicates with the first extruder 20 and is extruded from the transfer unit 22 ( A) is guided to a large width so as to be formed as the upper layer 11 of the film 10, and the middle layer outlet is communicated with the second extruder 30 and extruded from the transfer unit 32 to the film. Induces a large width so as to be formed into the middle layer 12 of (10), and the lower layer outflow path communicates with the third extruder 40 so that the third molten resin (c) extruded from the transfer unit 42 is transferred to the film 10. Induce a large width so as to be formed as the upper layer 11.

The three-stage die 60 is composed of a first discharge port 61 for ejection molding the first molten resin (a) melt-extruded in the first extruder 20, and the first melt-extruded in the second extruder 30 A second discharge port 62 for ejection-molding the molten resin a is configured, and a third discharge port 63 for ejection molding the first molten resin a to be melt-extruded by the third extruder 40 is provided.

The inlet of the upper, middle and lower outlet of the molding unit 50 communicates with the conveying units 22, 32, and 42, respectively, and the outlet communicates with the three-stage die 60, and consists of three layers of the upper, middle and lower layers. The three-stage die 60 is penetrated back and forth, and the first discharge port 61 has a large width of the upper layer, the second discharge port 62 has a large width of the middle layer, and the third discharge port 63 has a large width of the lower layer. Is composed.

The first discharge port 61 of the three-stage die 60 is connected to the upper discharge path of the molding unit 50, and the second discharge port 62 is connected to the middle discharge path of the molding unit 50, and the third discharge port ( 63) is connected to the lower outlet path of the molding unit 50, and the first discharge port 61 is discharged from the first molten resin (a), and the second discharge port 62 is discharged from the second molten resin (b). In the third discharge port 63, the third molten resin (c) is discharged, and the first, second, and third molten resins (a, b, c) are combined into one on the front surface of the three-stage die 60.

An adhesive feeder 70 for supplying an epoxy adhesive to the front of the three-stage die 60 is configured, and an adhesive additive feeder 80 for simultaneously supplying a mixture of an epoxy adhesive and a heat-resistant additive is configured.

The adhesive supply unit 70 transfers the epoxy adhesive bonding the upper layer and the intermediate layer from the front of the three-stage die 60 to bond nylon and polypropylene (PP), and the adhesive additive supply unit 80 is an intermediate layer An epoxy adhesive that reinforces heat resistance while adhering the upper and lower layers and a heat resistant additive are transferred from the front of the three-stage die 60 to bond polypropylene (PP) and polyethylene (PE).

The adhesive feeder 70 communicates with the hopper 74 into which the epoxy adhesive is injected, the auxiliary extruder 71 and the auxiliary extruder 71 for transferring the adhesive, and a transfer pipe for transferring the epoxy adhesive to the 3-stage die 60 72) and an adhesive block 73 for discharging the transferred epoxy adhesive.

The adhesive additive feeder 80 communicates with a hopper 75 into which a mixture of an epoxy adhesive and a heat-resistant additive is added, an auxiliary extruder 81 and an auxiliary extruder 81 for transferring the mixture, ), and an adhesive additive block 83 for discharging the transferred mixture and a transfer pipe 82 to be transferred to it.

The adhesive block 73 and the adhesive additive block 83 are configured on the front surface of the three-stage dice 60, but the adhesive block 73 is a first outlet 61 and a second outlet 62 of the three-stage dice 60. ), and the adhesive additive block 83 is positioned between the second discharge port 62 and the third discharge port 63 of the three-stage die 60.

The adhesive block 79 is located between the first discharge port 61 and the second discharge port 62 of the three-stage die 60 so that the epoxy adhesive is applied through the transfer pipe 72 when the film 10 is molded and extruded. It is discharged between nylon and polypropylene (PP) so that nylon and polypropylene (PP) are bonded to form upper and middle layers.

The adhesive additive supply unit 80 is located between the second discharge port 62 and the third discharge port 63 of the three-stage die 60, and transfers a mixture of an epoxy adhesive and a heat-resistant additive through a transfer pipe 82 to a film 10 ) Is discharged between the polypropylene (PP) and the polyethylene (PE) during the molding extrusion so that the polypropylene (PP) and the polyethylene (PE) are bonded to form a middle layer and a lower layer.

Nylon (nylon), polypropylene (PP), and polyethylene (PE) are integrally bonded to each other by a mixture of the epoxy adhesive, the epoxy adhesive, and the heat-resistant additive to form a three-layer film 10.

When the film 10 is extruded, the internal air is raised inside the front of the 3-stage die 60 to remove moisture formed on the surface of nylon, polypropylene (PP), and polyethylene (PE). A heater 91 is configured, and a hot air dryer 90 is configured with a blower 92 configured to transfer air heated by the heater 91.

The hot air dryer 90 is formed into a hexahedral space, and the film 10 extruded by a three-stage die 60 flows through the internal space of the hot air dryer 90, and at this time, the heater 91 is operated. The indoor air is heated by this, and the heated air is supplied to the film 10 by the blower 91 to remove moisture formed in the film 10.

Compositions for Examples 1 to 5 of the film of the present invention are shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Upper layer thickness (㎛) 9 12 15 18 21 Interlayer thickness (㎛) 32 36 40 44 48 Lower layer thickness (㎛) 32 36 40 44 48 Ceramic (parts by weight) 1.5 3.3 5.0 3.7 8.5

The composition of Examples 1 to 5 was mixed and extruded to evaluate the physical properties of the formed film.

(1) bending test

With a test piece of KS M3008 standard, the flexural modulus was measured using an Instron UTM (Instron 4400 series) with a span distance of 50 mm and a crosshead speed of 2.5 m/min.

(2) Tensile test

Tensile strength was measured with a test piece of KS M3006 standard under the conditions of a load cell of 50 kgf in an Instron UTM (Instron 4400 series).

(3) Impact strength

Izod impact strength was measured using an impact tester (Model 863, Ueshima Seisakusho Co., Ltd.) according to the JIS K7110 standard on a rectangular test piece (63 mm x 12 mm x 5 mm).

(4) Peeling phenomenon

After adhering an adhesive tape having a width of 10 mm and a length of 50 mm to the upper layer of the film, the degree of peeling of the upper layer by pulling the adhesive tape was observed visually, and if a peeling phenomenon occurred, it was judged as defective.

The physical properties measured for Examples 1 to 5 are shown in Table 2 below.

Film property evaluation result division Example 1 Example 2 Example 3 Example 4 Example 5 Flexural modulus (kgf/㎠) 10,208 10,673 11,120 11,573 12,021 Tensile test (kgf/㎠) 312 320 326 333 341 Impact strength (J/m) 50 54 57 60 65 Peeling phenomenon none none none none none

The flexural modulus of the present invention was 10,2008 kgf/cm 2 or more, the tensile test was 312 kgf/cm 2 or more, and the impact strength was 50 J/m or more, and no peeling phenomenon occurred, so it was superior to the general packaging film.

The terms or words used in the specification and claims of the present invention are not limited to a conventional or dictionary meaning, and the inventor can appropriately define the concept of terms in order to describe his own invention in the best way. Based on the point, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

As described above, the embodiments described in the detailed description of the present invention and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention. Various modifications are possible within the limit of not deviating from

Therefore, the scope of the present invention is limited to the described embodiments and should not be defined, but it should be understood that modified examples may or may exist at the time of filing of the present invention, and should be determined by the claims and equivalents. .

10: film 11: upper layer
12: middle floor 13 : lower floor
14: adhesive layer 15: adhesive heat-resistant layer
20: first extruder 21, 31, 41, 74, 84: hopper
22, 32, 42: transfer unit 30: second extruder
40: third extruder 50: molding unit
51: outlet block 60: 3-stage dice
61: first discharge port 62: second discharge port
63: third discharge port 70: adhesive feeder
71, 81: auxiliary extruder 72, 82: transfer pipe
73: adhesive block 80: adhesive additive supplier
83: adhesive additive block 90: hot air dryer
91: heater 92: blower
a: first molten resin b: second molten resin
c: third molten resin

Claims (5)

In the microwave oven film,
The film includes an upper layer of nylon with a thickness of 11 to 19 μm, an intermediate layer of polypropylene (PP) with a thickness of 35 to 45 μm, and a lower layer of polyethylene (PE) with a thickness of 35 to 45 μm on a three-stage die. A heat-resistant additive in which 2 to 8 parts by weight per 100 parts by weight of the adhesive is mixed as a ceramic powder in which the upper layer and the lower layer are bonded with an epoxy adhesive and the upper and lower layers are epoxy adhesive and the ceramic powder without electrical conductivity. A heat-resistant adhesive layer adhered by a mixture of;
An adhesive supply unit configured with an adhesive block configured to supply an epoxy adhesive between the first discharge port and the second discharge port in front of the three-stage dies and an auxiliary extruder;
An adhesive additive supply unit consisting of an adhesive additive block comprising an auxiliary extruder and a mixture of an epoxy adhesive and a heat resistant additive is supplied between the second discharge port and the third discharge port in front of the three-stage die;
A hot air dryer is constructed in front of the three-stage dies, a heater for raising the air therein, and a blower for transporting the heated air by the heater, and the film extruded by the three-stage dies is hot air dryer Microwave oven film, characterized in that moisture is removed by flowing through the inner space of the.
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