EP4081583A1 - Ein vakuumverschliessbarer kunststoffbeutel - Google Patents
Ein vakuumverschliessbarer kunststoffbeutelInfo
- Publication number
- EP4081583A1 EP4081583A1 EP20728029.8A EP20728029A EP4081583A1 EP 4081583 A1 EP4081583 A1 EP 4081583A1 EP 20728029 A EP20728029 A EP 20728029A EP 4081583 A1 EP4081583 A1 EP 4081583A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film layer
- layers
- polyethylene
- plastic bag
- density polyethylene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920003023 plastic Polymers 0.000 title claims abstract description 81
- 239000004033 plastic Substances 0.000 title claims abstract description 81
- 239000004698 Polyethylene Substances 0.000 claims abstract description 63
- -1 polyethylene Polymers 0.000 claims abstract description 61
- 229920000573 polyethylene Polymers 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 59
- 235000013305 food Nutrition 0.000 claims abstract description 21
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 60
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 60
- 238000005266 casting Methods 0.000 claims description 47
- 238000000465 moulding Methods 0.000 claims description 45
- 229920001684 low density polyethylene Polymers 0.000 claims description 34
- 239000004702 low-density polyethylene Substances 0.000 claims description 34
- 238000007664 blowing Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 30
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 24
- 238000000071 blow moulding Methods 0.000 claims description 23
- 229920001903 high density polyethylene Polymers 0.000 claims description 18
- 239000004700 high-density polyethylene Substances 0.000 claims description 18
- 239000012803 melt mixture Substances 0.000 claims description 16
- 238000007731 hot pressing Methods 0.000 claims description 13
- 238000013329 compounding Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 239000013533 biodegradable additive Substances 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000010096 film blowing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000002360 preparation method Methods 0.000 abstract description 9
- 239000011796 hollow space material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 181
- 230000000052 comparative effect Effects 0.000 description 12
- 230000032683 aging Effects 0.000 description 11
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 10
- 238000006731 degradation reaction Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 239000011888 foil Substances 0.000 description 7
- 238000003475 lamination Methods 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 7
- 239000007858 starting material Substances 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000003878 thermal aging Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000012667 polymer degradation Methods 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 230000003413 degradative effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- SZINCDDYCOIOJQ-UHFFFAOYSA-L manganese(2+);octadecanoate Chemical compound [Mn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O SZINCDDYCOIOJQ-UHFFFAOYSA-L 0.000 description 1
- 235000013622 meat product Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
Definitions
- the present invention relates to the preparation and manufacture of food packaging bags, in particular a vacuum sealable plastic bag.
- patent application CN 01129006.4 discloses a small package for marinated meat products.
- patent application CN 99125782.0 which has disclosed a composite material for food packaging. It contains a core layer and an outer layer, the core layer being coated with an outer layer containing aluminum foil.
- patent application CN 201310420320.8 which discloses a functional multi-layer cling film made of composite material. Corresponding to the five-layer structure of PE / EVOH / PA / EVOH / PE, suitable additives are added to each layer and functional multi-layer cling films made of composite material are produced from them through coextrusion blow molding.
- An object to be achieved by the present invention is to provide an improved vacuum sealable plastic bag.
- a naturally degradable vacuum sealable plastic bag is designed as follows:
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and a receiving cavity is formed in the middle of said bag body, preferably between two of these layers.
- the receiving cavity can be used to store food.
- one or more of the film layers have a degradation-promoting material, with polyethylene also being contained in the film material for the preparation and production of said multiple layers.
- the amount of the degradation-promoting material added is about 5% by weight of the polyethylene.
- the proposed naturally degradable vacuum sealable plastic bag can effectively reduce environmental pollution and increase the safety and stability of food storage.
- the amount of the degradation-promoting material added is preferably about 1 to 10% by weight of the polyethylene, particularly preferably 3 to 7% by weight of the polyethylene.
- the polyethylene contained in an outer film layer material of the bag body is a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 1- 3: 1-10: 1-7, and is prepared and manufactured through a coextrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene contained in an inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 1-7: 1-15, and is made by prepared and manufactured the coextrusion, casting, blow molding and molding process.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- the film layers of the plurality of layers are preferably two film layers or more than two film layers. If the film layers of the multiple layers are more than two film layers, then the polyethylene contained in a middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio from 1-3: 1-8: 1-5 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- the degradation-promoting material is an oxidative biodegradable additive with polyethylene as a carrier.
- the additive can be a metal stearate, in particular a manganese stearate.
- the additive can also contain a stabilizer.
- the additive from Symphony Plastic Technologies known under the brand “D2W” can advantageously be used as an oxidatively degrading additive.
- the outer film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is subjected to an orientation and expansion treatment.
- the inner film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is not subjected to any orientation and stretching treatment.
- strip-like or point-like air channels are embossed on its surface.
- the coextrusion, casting, blowing and molding process includes the following:
- the films are blown and cooled using a film blowing machine with a nozzle slot of less than 1.0 mm and a speed of 10 to 20 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the present invention has the following advantages compared to the current state of the art:
- different film layers are formed according to a certain combination and ratio of HDPE (high density polyethylene), LDPE (low density polyethylene), LLDPE (linear low density polyethylene) and metallocene linear low density polyethylene (mLLDPE) . So the outer film layer has a significant tensile strength, tear strength, environmental stress crack resistance,
- the oxidative biodegradable additive D2W is added with a polyethylene carrier resin. It promotes the oxidative degradation of the vacuum sealable plastic bag in the natural environment without causing secondary pollution, which is in line with the sustainable production ideology.
- the vacuum sealable plastic bag of the present invention has not only good degradability but also other such advantages as high security and stability. No additional superfluous raw material is added during the preparation and manufacturing process.
- the compounding of different polyethylene materials alone can reduce the addition of components that are difficult to break down, or components that could affect human health, during the preparation and manufacturing process of the plastic bag.
- the simple components make the preparation and manufacturing process of the plastic bag of the present invention simple. The process steps are easy to control, costs are reduced, and mass production is possible.
- FIG. 1 shows a schematic representation of a naturally degradable, vacuum sealable plastic bag in one of the exemplary embodiments of the present invention.
- FIG. 2 is a schematic representation of the optical carbonyl density of a naturally degradable, vacuum sealable plastic bag in the accelerated thermal aging process in one of the exemplary embodiments of the present invention.
- the present invention provides a naturally degradable vacuum sealable plastic bag.
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and a receiving cavity is formed in the middle of the bag body, preferably between two of these layers.
- the receiving cavity can be used to store food.
- at least one film layer in the multiple layers has the degradation-promoting material, with polyethylene being contained in the film material for preparing and producing the multiple layers.
- the amount of the degradation-promoting material added is about 5% by weight of the polyethylene.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the polyethylene in this embodiment which is contained in the outer film layer material of the bag body, a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 1: 1: 1 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene that is contained in the inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 1: 1 and is produced by the coextrusion, casting, Blowing and molding process prepared and manufactured.
- the film layers of the multiple layers are two film layers or more than two film layers.
- the polyethylene contained in the middle film layer material is a mixture made of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio of 1: 1: 1 and is prepared and manufactured using the coextrusion, casting, blow molding and molding process .
- the density of LLDPE Linear Low-Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- the degradation-promoting material in this embodiment is the oxidative biodegradable additive D W with polyethylene as a carrier.
- the outer film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is subjected to orientation and stretching treatment.
- the inner film layer of said bag body prepared and manufactured by the mixed coextrusion blow molding is not subjected to any orientation and stretching treatment.
- strip-like or point-like air channels are embossed on its surface.
- the coextrusion, casting, blowing and molding process refers to the following: adding the starting material to the extruder, increasing the temperature to 180 ° C to form a melt mixture, then rapidly reducing the temperature to 05 ° C at a cooling rate of 15 ° C / S and transferring the cooled melt mixture for casting onto the casting bed, which has already been preheated to 45 ° C.
- the foils are blown and cooled using a blown film machine with a nozzle slot of less than 1.0 mm and a speed of 10 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag, including the bag body, is created by hot pressing with a roller and shaping the film layers.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the present invention provides a naturally degradable vacuum sealable plastic bag.
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and a receiving cavity is formed in the middle of the bag body, preferably between two of these layers.
- the receiving cavity can be used to store food.
- the amount of the degradation-promoting material added is about 5% by weight of said polyethylene.
- the compounding of the film layers of the multiple layers refers to the successive lamination of the prepared and manufactured inner film layer and outer film layer, or the inner film layer, middle film layer and outer film layer.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the polyethylene in this embodiment which is contained in the outer film layer material of the bag body, a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 3: 10: 7 and is prepared and manufactured by the co-extrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene that is contained in the inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 7:15 and is produced by the coextrusion, casting, Blowing and molding process prepared and manufactured.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- the film layers of the plurality of layers are two film layers or more than two film layers. If the film layers of the multiple layers are more than two film layers, then the polyethylene contained in the middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio of 3: 8: 5 and is prepared and manufactured by the co-extrusion, casting, blowing and molding process.
- the density of LLDPE Linear Low-Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- the degradation-promoting material in this embodiment is the oxidative biodegradable additive D2W with polyethylene as a carrier.
- the outer film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is subjected to orientation and stretching treatment.
- the inner film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is not subjected to any orientation and stretching treatment.
- strip-like or point-like air channels are embossed on its surface.
- the coextrusion, casting, blowing and molding process includes the following: adding the starting material to the extruder, increasing the temperature to 350 ° C to form a melt mixture, then rapidly reducing the temperature to 85 ° C at a cooling rate of 15 ° C / S and transferring the cooled melt mixture for casting onto the casting bed, which has already been preheated to 65 ° C.
- the films are blown and cooled using the film blowing machine with a nozzle slot of less than 1.0 mm and a speed of 20 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag, including the bag body, is created by hot pressing with a roller and shaping the film layers.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- the present invention provides a naturally degradable vacuum sealable plastic bag.
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and a receiving cavity is formed in the middle of the bag body, preferably between two of these layers.
- the receiving cavity can be used to store food.
- the amount of the degradation-promoting material added is about 5% by weight of said polyethylene.
- the compounding of the film layers of the multiple layers includes the sequential lamination of the prepared and manufactured inner film layer and outer film layer, or the inner film layer, middle film layer and outer film layer.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the film layer composed of three layers is preferred. These are in turn the inner film layer, the middle film layer and the outer film layer.
- the polyethylene in this embodiment which is contained in the outer film layer material of the bag body, a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 2: 5: 5 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene that is contained in the inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 4:10 and is produced by the coextrusion, casting, Blowing and molding process prepared and manufactured.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- the film layers of the plurality of layers are two film layers or more than two film layers. If the film layers of the multiple layers are more than two film layers, then the polyethylene contained in the middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio of 2: 7: 3 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- the density of LLDPE Linear Low-Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- the degradation-promoting material in this embodiment is the oxidative biodegradable additive D W with polyethylene as a carrier.
- the outer film layer of the bag body which is caused by the mixed
- Coextrusion blow molding is prepared and manufactured is subjected to an orientation and expansion treatment.
- Coextrusion blow molding is prepared and made is not subjected to any orientation and stretching treatment.
- strip-like or point-like air channels are embossed on its surface.
- the coextrusion, casting, blowing and molding process refers to the following: adding the starting material to the extruder, increasing the temperature to 220 ° C to form a melt mixture, then rapidly reducing the temperature to 70 ° C at a cooling rate of 15 ° C / S and Transfer the cooled melt mixture for casting onto the casting bed, which has already been preheated to 50 ° C.
- the foils are blown and cooled using a blown film machine with a nozzle slot of less than 1.0 mm and a speed of 15 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag, including the bag body, is created by hot pressing with a roller, vacuuming and shaping the film layers.
- the present invention provides a naturally degradable vacuum sealable plastic bag.
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and a receiving cavity is formed in the middle of the bag body, preferably between two of these layers.
- the receiving cavity can be used to store food.
- the amount of the degradation-promoting material added is 5% by weight of the polyethylene.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the polyethylene in this comparative example which is contained in the outer film layer material of the bag body, is a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 7: 5: 10 and is prepared and manufactured by the co-extrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene that is contained in the inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 9:10 and is produced by the coextrusion, casting, Blowing and molding process prepared and manufactured.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- the film layers of the multiple layers are two film layers or more than two film layers.
- the polyethylene contained in the middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio of 15: 7: 8 and is prepared and manufactured by the co-extrusion, casting, blowing and molding process.
- the density of LLDPE Linear Low-Density Polyethylene
- the density of LLDPE Linear Low-Density Polyethylene
- the structural formula is- [CH2-CH2] n-.
- the degradation-promoting material in this comparative example is the oxidative biodegradable additive D W with polyethylene as a carrier.
- the outer film layer of the bag body which is caused by the mixed
- Coextrusion blow molding is prepared and manufactured is subjected to an orientation and expansion treatment.
- the inner film layer of the bag body which is caused by the mixed
- Coextrusion blow molding is prepared and made is not subjected to any orientation and stretching treatment.
- strip-like or point-like air channels are embossed on its surface.
- the coextrusion, casting, blowing and molding process includes the following: adding the starting material to the extruder, increasing the temperature to 220 ° C to form a melt mixture, then rapidly reducing the temperature to 70 ° C at a cooling rate of 15 ° C / S and transfer of the cooled melt mixture for casting onto the casting bed, which has already been preheated to 50 ° C.
- the foils are blown and cooled using a blown film machine with a nozzle slot of less than 1.0 mm and a speed of 15 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag, including the bag body, is created by hot pressing and shaping the film layers with a roller.
- the present invention provides a vacuum sealable plastic bag.
- the vacuum sealable plastic bag contains a bag body.
- the bag body is composed of layers which are compounded from several film layers, and in the middle of the bag body, preferably between two of these Layers, a receiving cavity is formed.
- the receiving cavity can be used to store food, with polyethylene being contained in the film material for preparing and producing the multiple layers.
- the compounding of the film layers of the multiple layers refers to the successive lamination of the prepared and manufactured inner film layer and outer film layer, or the inner film layer, middle film layer and outer film layer.
- the vacuum sealable plastic bag including the bag body, is produced by hot pressing with a roller and molding.
- the polyethylene in this comparative example which is contained in the outer film layer material of the bag body, is a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 2: 5: 5 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the polyethylene that is contained in the inner film layer material of the bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 4:10 and is produced by the coextrusion, casting, Blowing and molding process prepared and manufactured.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- the film layers of the multiple layers are two film layers or more than two film layers. If the film layers of the multiple layers are more than two film layers, then the polyethylene contained in the middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio of 2: 7: 3 and is prepared and manufactured by the coextrusion, casting, blowing and molding process.
- the density of LLDPE Linear Low-Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- the outer film layer of the bag body which is prepared and manufactured by the mixed coextrusion blow molding, is subjected to orientation and stretching treatment.
- the inner film layer of the bag body prepared and manufactured by the mixed coextrusion blow molding is not subjected to any orientation and stretching treatment. After the inner film layer has been formed, air channels in the form of strips or points are embossed on its surface.
- the coextrusion, casting, blowing and molding process includes the following: adding the starting material to the extruder, increasing the temperature to 220 ° C to form a melt mixture, then rapidly reducing the temperature to 70 ° C at a cooling rate of 15 ° C / S and transfer of the cooled melt mixture for casting onto the casting bed, which has already been preheated to 50 ° C.
- the foils are blown and cooled using a blown film machine with a nozzle slot of less than 1.0 mm and a speed of 15 rpm.
- the film layers are created after molding.
- the vacuum sealable plastic bag, including the bag body, is created by hot pressing with a roller and shaping the film layers.
- Comparative example 3 is a commercially available vacuum sealable plastic bag. It is a product that the expert in this field acquires on the market on the basis of the product description. Based on the product description, the plastic product is manufactured from a starting material from the polyethylene series. In the present invention, it is used as a comparison.
- the real-time stability of the polymer products stored at room temperature can be determined in a relatively short time by monitoring the degradation during the thermal aging process at high temperatures in accordance with ASTM D5510. In addition, they can be prevented from being exposed to sunlight for a long time.
- the polymer degradation is evaluated by determining the polymer oxidation by means of infrared spectroscopy. An increase in the characteristic amount of the infrared spectrum corresponding to the carbonyl product from polymer oxidation is recorded as the carbonyl optical density. If no significant increase in carbonyl optical density (no more than 0.0010) is observed during the accelerated aging time, it is considered to be an indication of the real-time stability of the product under storage conditions.
- the naturally degradable and vacuum sealable plastic bag produced in exemplary embodiment 3 was selected as a test sample.
- the stability and degradation behavior of the naturally degradable, vacuum sealable plastic bag were evaluated through accelerated laboratory aging. The results are shown in Table 2:
- the degradation of polymers which are then exposed to sunlight under initially dark conditions can be determined in a relatively short time by monitoring the degradation during accelerated fluorescent UV aging.
- the polymer degradation is evaluated by determining the polymer oxidation by means of infrared spectroscopy. An increase in the characteristic amount of the infrared spectrum corresponding to the carbonyl product from polymer oxidation is recorded as the carbonyl optical density.
- the optical carbonyl density of 0.0100 is regarded as pre-degradation, which leads to spontaneous embrittlement.
- the naturally degradable and vacuum sealable plastic bag produced in exemplary embodiment 3 was selected as the test sample.
- the sample was exposed to constant fluorescent UV aging for 48 hours, and then to accelerated thermal aging under dark conditions. By monitoring the changes in the optical carbonyl density with the aging time, the rate of degradation was determined and compared. The results are shown in Table 3:
- Table 3 shows that the test sample showed a significant increase in the optical carbonyl density during the accelerated aging process.
- the sample demonstrated a carbonyl optical density of 0.0165 after an exposure of 288 hours (including an initial fluorescent UV exposure of 48 hours). This indicates that the sample is already significantly degraded and shows that the vacuum sealable plastic bag of the present invention can degrade under natural conditions when it has exceeded its useful life.
- the naturally degradable and vacuum sealable plastic bag of the present invention has the advantages of high security performance, high stability and good weather resistance within its service life. In addition, there is no secondary pollution during degradation, making it environmentally friendly. In addition, the manufacturing method is simple and suitable for mass production.
- the invention also relates to the following objects:
- a naturally degradable vacuum sealable plastic bag comprising the following features: said vacuum sealable plastic bag includes a bag body; said bag body is composed of layers compounded from several layers of film, and a receiving cavity is formed in the center of said bag body; said receiving cavity is used to store food; there is also at least one layer of film in said plurality of layers utilizing the degradative material, the film material including polyethylene for preparation and manufacture of said plurality of layers; according to the mass fraction in percent, the amount of said degradation-promoting material added is 5% of said polyethylene.
- Foil layer material of said bag body is a mixture of HDPE (High Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Linear Low-Density Polyethylene (mLLDPE) in a weight ratio of 1-3: 1-10: 1-7 and is prepared and manufactured through the coextrusion, casting, blowing and molding process.
- HDPE High Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Linear Low-Density Polyethylene
- the film layer material contained in the said bag body is a mixture of LDPE (Low Density Polyethylene) and LLDPE (Linear Low-Density Polyethylene) in a weight ratio of 1-7: 1-15 and is made through the coextrusion, casting, blow molding and molding process prepared and manufactured.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- a naturally degradable, vacuum sealable plastic bag which has the following features: the film layers of said multiple layers are two film layers or more than two film layers; If the film layers of the multiple layers are more than two film layers, then the polyethylene contained in said middle film layer material is a mixture of LDPE (Low Density Polyethylene), LLDPE (Linear Low-Density Polyethylene) and metallocene Low Linear Density Polyethylene (mLLDPE) in a weight ratio from i-3: i-8: i-5 and is prepared and manufactured through the coextrusion, casting, blowing and molding process.
- LDPE Low Density Polyethylene
- LLDPE Linear Low-Density Polyethylene
- mLLDPE metallocene Low Linear Density Polyethylene
- a naturally degradable, vacuum sealable plastic bag according to item 1 which has the following feature:
- the said degradation-promoting material is the oxidative, biodegradable additive D2W with polyethylene as a carrier.
- a naturally degradable vacuum sealable plastic bag according to item 2 having the following feature: The outer film layer of said bag body, which is prepared and produced by said mixed coextrusion blow molding, is subjected to an orientation and stretching treatment.
- a naturally degradable, vacuum sealable plastic bag according to item 3 which has the following feature: After the said inner film layer has been formed, strip-like or point-like air channels are embossed on its surface.
- the said coextrusion, casting, blowing and molding process relates to the following: adding the starting material to the extruder, increasing the temperature to 180-350 ° C to form a melt mixture, then rapidly reduce the temperature to 65-85 ° C at a cooling rate of 15 ° C / S and transfer the cooled melt mixture for casting onto the casting bed, which has already been preheated to 45-65 ° C; the foils are blown and cooled using a blown film machine with a nozzle slot of less than 1.0 mm and a speed of 10 to 20 rpm; after molding, the film layers are created.
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Abstract
Description
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PCT/EP2020/064421 WO2021136603A1 (de) | 2019-12-29 | 2020-05-25 | Ein vakuumverschliessbarer kunststoffbeutel |
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US5091262A (en) * | 1990-08-27 | 1992-02-25 | Rexene Products Company | Starch filled coextruded degradable polyethylene film |
US7665896B1 (en) * | 2005-06-23 | 2010-02-23 | Circle Back, Inc. | Plastic bag to facilitate evacuation prior to sealing |
EP2344333B1 (de) * | 2008-10-23 | 2018-02-21 | Univation Technologies, LLC | Lineare polyethylene mit hohem mir und coexdrudierte folien daraus |
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2019
- 2019-12-29 CN CN201911385903.5A patent/CN111169126B/zh active Active
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2020
- 2020-05-25 EP EP20728029.8A patent/EP4081583A1/de active Pending
- 2020-05-25 WO PCT/EP2020/064421 patent/WO2021136603A1/de unknown
- 2020-05-25 KR KR1020227026476A patent/KR20220123545A/ko unknown
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WO2021136603A1 (de) | 2021-07-08 |
CN111169126B (zh) | 2022-03-08 |
US20230045878A1 (en) | 2023-02-16 |
KR20220123545A (ko) | 2022-09-07 |
CN111169126A (zh) | 2020-05-19 |
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