EP4081583A1 - Sac en plastique pouvant être fermé sous vide - Google Patents

Sac en plastique pouvant être fermé sous vide

Info

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
Application number
EP20728029.8A
Other languages
German (de)
English (en)
Inventor
Linyi XIE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Braukmann GmbH
Original Assignee
Braukmann GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Braukmann GmbH filed Critical Braukmann GmbH
Publication of EP4081583A1 publication Critical patent/EP4081583A1/fr
Pending legal-status Critical Current

Links

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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/06—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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
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    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
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    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
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    • B32B2307/00—Properties of the layers or laminate
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    • B32B2307/716—Degradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
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    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
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    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
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    • C—CHEMISTRY; METALLURGY
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/012—Additives activating the degradation of the macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • 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
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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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

Sac en plastique dégradable naturellement pouvant être fermé sous vide, comprenant un corps de sac qui se compose de couches composées de plusieurs couches de film (1, 2, 3), une cavité réceptrice étant formée au centre du corps de sac, laquelle cavité peut être utilisée pour la conservation de produits alimentaires. Au moins une des couches de film présente une matière favorisant la dégradation et la matière de film utilisée pour la préparation et la production desdites couches contient du polyéthylène, la quantité ajoutée de matière favorisant la dégradation représentant environ 5 % en poids du polyéthylène.
EP20728029.8A 2019-12-29 2020-05-25 Sac en plastique pouvant être fermé sous vide Pending EP4081583A1 (fr)

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CN201911385903.5A CN111169126B (zh) 2019-12-29 2019-12-29 一种可自然降解的真空封口胶袋
PCT/EP2020/064421 WO2021136603A1 (fr) 2019-12-29 2020-05-25 Sac en plastique pouvant être fermé sous vide

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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 (fr) * 2008-10-23 2018-02-21 Univation Technologies, LLC Polyéthylènes linéaires à mir élevé et films coextrudés associés
CN102416744B (zh) * 2011-08-03 2015-09-30 大连瑞贤达塑胶有限公司 一种食品包装塑料基材薄膜及其生产工艺
CN204871970U (zh) * 2015-08-19 2015-12-16 中山市广茂生物塑料科技有限公司 一种食品包装袋
CN107018827A (zh) * 2017-03-20 2017-08-08 兰州鑫银环橡塑制品有限公司 一种环境全降解薄膜材料及其制备方法
CN107118423A (zh) * 2017-06-16 2017-09-01 王康宁 一种可降解的pe夹链自封袋及生产工艺
AU2018293920B2 (en) * 2017-06-29 2023-08-24 Integrated Packaging Group Pty Ltd Process and system for accelerated degradation of polyolefins
CN107522933B (zh) * 2017-09-25 2020-08-28 四川妙顺环保科技有限公司 一种垃圾分类用生物基全降解塑料垃圾袋及其制备方法
CN108327368B (zh) * 2018-01-26 2020-09-29 北京国瑞新源投资有限公司 一种三层保水型环境生物降解薄膜及其制备方法
CN108659312A (zh) * 2018-05-23 2018-10-16 芜湖同达新材料科技有限公司 一种可降解塑料薄膜及其制备方法
CN108995995A (zh) * 2018-07-07 2018-12-14 青岛金利塑料有限公司 一种高气密性耐液压塑料袋及其制备方法
CN109337170A (zh) * 2018-10-09 2019-02-15 湖北冠誉塑料包装股份有限公司 氧化生物降解塑料袋及其制备方法

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CN111169126B (zh) 2022-03-08
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KR20220123545A (ko) 2022-09-07
CN111169126A (zh) 2020-05-19

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