CN102423942A - Plastic substrate film for food packaging and processing technic thereof - Google Patents

Plastic substrate film for food packaging and processing technic thereof Download PDF

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Publication number
CN102423942A
CN102423942A CN2011102206397A CN201110220639A CN102423942A CN 102423942 A CN102423942 A CN 102423942A CN 2011102206397 A CN2011102206397 A CN 2011102206397A CN 201110220639 A CN201110220639 A CN 201110220639A CN 102423942 A CN102423942 A CN 102423942A
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CN
China
Prior art keywords
lldpe
low density
density polyethylene
packaging
film
Prior art date
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Granted
Application number
CN2011102206397A
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Chinese (zh)
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CN102423942B (en
Inventor
梁继鹏
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.)
Dalian Ruixianda Plastic Co., Ltd.
Original Assignee
DALIAN FANGSHENG PLASTIC Co Ltd
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 DALIAN FANGSHENG PLASTIC Co Ltd filed Critical DALIAN FANGSHENG PLASTIC Co Ltd
Priority to CN201110220639.7A priority Critical patent/CN102423942B/en
Publication of CN102423942A publication Critical patent/CN102423942A/en
Application granted granted Critical
Publication of CN102423942B publication Critical patent/CN102423942B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention relates to a plastic substrate film for food packaging. The plastic substrate film comprises an inner layer, an intermediate layer and an outer layer, wherein the inner layer is prepared from low density polyethylene (LDPE) and metallocene linear low density polyethylene (mLLDPE); and the intermediate layer and the outer layer are prepared from LDPE and LLDPE. A processing technic of the plastic substrate film comprises the steps of mixed feed extruding, film blowing, setting, haulage cutting and the like. The plastic substrate film and the processing technic have the following beneficial effects: the plastic substrate film has high barrier property, high air tightness, pollution resistance, high heat sealing strength and good heat sealing property, has certain pressure resistance and impact resistance and conforms to food safety certification.

Description

A kind of packaging for foodstuff plastic basis material film and production technology thereof
Technical field
The invention belongs to the plastics chemical industry, relate in particular to a kind of packaging for foodstuff plastic basis material film and production technology thereof.Background technology
Present packaging for foodstuff industry says that the packing base material film quantity that needs is big, kind is many, adopts the very difficult packing instructions that adapt to Special food of film of single raw material production.Trace it to its cause, though mainly be that respectively to produce producer's production technology of plastic raw materials each has something to recommend him, every kind of raw material all has its weak point, so the film of producing is difficult to satisfy the demand of various situation.Adopt different material to mix the way of using though some companies also have, owing to lack the necessary testing equipment and the testing program of checkout equipment and system, its effect is unsatisfactory.
Especially harsh for the requirement of packaging for foodstuff, require that the plastic basis material film must possess high barrier, high-air-tightness, resistance tocrocking, heat seal strength is high, heat sealability is good, and certain resistance to pressure and resistance to impact are arranged, and meets the food security authentication.Be fit to packaging for foodstuff and use the useful LLDPE LLDPE of polyethylene raw material, hp-ldpe LDPE and metallocene linear polyethylene mLLDPE.But; The plastic sheeting of simply one or more polyethylene raw material mixing after-blow being made can not satisfy the needs of extra package; Also need to carry out qualitative and quantitative analysis, do the careful proportioning of system, be aided with necessary processing aid again according to designing requirement according to density, melt index, vicat softening point temperature, biaxial tension rate and the hot strength of various polyethylene raw materials; Finally make the plastic sheeting of blowing out within the specific limits, satisfy the requirement of extra package.Yet; The polyethylene film of individual layer is poor to the barrier of gases such as oxygen; Packing sauce class time-like is prone to cause sealing part to pollute, and general flexible package punch polyethylene film is poor to the sealing property of this type of packing; Can not satisfy the requirement of its technology of the package and connection with wrapping of piece storage period, therefore must adopt barrier property and be mingled with sealing property all good multilaminar polyethylene modified film or laminated film.
Summary of the invention
The present invention has designed a kind of packaging for foodstuff plastic basis material film and production technology thereof; Its purpose is to provide a kind of high barrier, high-air-tightness, resistance tocrocking, heat seal strength is high, heat sealability is good; Certain resistance to pressure and resistance to impact are arranged, meet the packaging for foodstuff Bag Material base film of food security authentication.
In order to solve the technical problem of above-mentioned existence, the present invention has adopted following scheme:
Packaging for foodstuff plastic basis material film is characterized in that: comprise internal layer, intermediate layer and outer three-decker; Described internal layer adopts low density polyethylene and metallocene linear-low density polyethylene mLLDPE to process; Described intermediate layer adopts low density polyethylene and LLDPE LLDPE to process, described outer low density polyethylene and the LLDPE LLDPE of adopting.
It is 1.8-2.2g/10min that said internal layer adopts melt index, and density is 0.923-0.926g/cm 2Low density polyethylene, melt index be 1.9-2.4g/10min, density is 0.910-0.915g/cm 2Metallocene linear-low density polyethylene mLLDPE, its quality proportioning is LDPE:mLLDPE=25-35:65-75;
It is 1.8-2.2g/10min that melt index is adopted in said intermediate layer, and density is 0.923-0.926g/cm 2Low density polyethylene and melt index be 1.9-2.2g/10min, density is 0.918-0.922g/cm 2LLDPE LLDPE, its quality proportioning is LDPE:LLDPE=35-45:55-65;
Said outer employing melt index is 0.8-2.1g/10min, and density is 0.923-0.926g/cm 2Low density polyethylene and melt index be 1.9-2.2g/10min, density is 0.918-0.922g/cm 2LLDPE LLDPE, its quality proportioning is LDPE:LLDPE=35-45:55-65.
Mass ratio between said internal layer, intermediate layer and the skin is 1:1:1.
A kind of preparation technology of packaging for foodstuff plastic basis material film is characterized in that may further comprise the steps:
Send extruder to extrude after each raw material mixed in proportion, wherein the melt temperature of extruder is 175 ℃-195 ℃, and the initial temperature of charging is 175 ℃-185 ℃; The roller bar rotating speed of main frame is 80r/min-120r/min; Carry out blown film then; Finalize the design, draw cutting at last.
The incorporation time of said raw material is 15min-20min.
The temperature of said film head raises from bottom to top gradually, and its temperature range is 165 ℃-205 ℃.
The thickness of said film is not more than 0.0035mm.
This packaging for foodstuff plastic basis material film and production technology thereof have following beneficial effect:
(1) packaging for foodstuff plastic basis material thin-film barrier property of the present invention and air-tightness are good, have good resistance tocrocking, resistance to pressure and resistance to impact, have heat seal strength height, characteristics that heat sealability is good simultaneously, meet the state food safety certification.
(2) packaging for foodstuff plastic basis material film production process of the present invention has improved the inherent quality of product, has improved appearance, has reduced labour intensity simultaneously, has improved production efficiency.
(3) packaging for foodstuff plastic basis material film production process of the present invention, reasonable in design, flow process is simple, is easy to realize.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is further specified:
The following example is intended to explain the optimal way of test, and in these embodiment, except as otherwise noted, described percentage is by weight.
Following testing equipment adopts: the blowing main frame: three-layer co-extruded traction rotation blown film unit, drawn subsidiary engine, winder etc. and formed by three extruders, a die head, typing cage, a cover.
Checkout equipment: GBL-L electronic tension tester and MXD-01 friction coefficient instrument.
Embodiment 1
With the ratio of raw material in internal layer low density polyethylene 25%, metallocene linear polyethylene mLLDPE75%; The intermediate layer is in the ratio of low density polyethylene 40%, LLDPE LLDPE60%; Outer ratio preparation raw materials for production in low density polyethylene 40%, LLDPE LLDPE60%; Mix 15min, setting melt temperature is 185 ℃-195 ℃, and the roller bar rotating speed of main frame is 175 ℃-200 ℃ of 120r/min film head temperature, typing, traction cutting.The sealed polyethylene plastic performance of producing is following: hot strength is that 22.78Mpa, elongation at break are 718.5%, heat seal strength is 9.8, coefficient of friction: 0.213.
Embodiment 2
With the ratio of raw material in internal layer low density polyethylene 30%, metallocene linear polyethylene mLLDPE70%; The intermediate layer is in the ratio of low density polyethylene 50%, LLDPE LLDPE50%; Outer ratio preparation raw materials for production in low density polyethylene 45%, LLDPE LLDPE55%; Mix 18min, setting melt temperature is 185 ℃-195 ℃, and the roller bar rotating speed of main frame is 175 ℃-200 ℃ of 100r/min film head temperature, typing, traction cutting.The sealed polyethylene plastic performance of producing is following: hot strength is that 22.78Mpa, elongation at break are 718.5%, heat seal strength is 9.8, coefficient of friction: 0.213.
Embodiment 3
With the ratio of raw material in internal layer low density polyethylene 35%, metallocene linear polyethylene mLLDPE65%; The intermediate layer is in the ratio of low density polyethylene 40%, LLDPE LLDPE60%; Outer ratio preparation raw materials for production in low density polyethylene 45%, LLDPE LLDPE55%; Mix 20min, setting melt temperature is 185 ℃-195 ℃, and the roller bar rotating speed of main frame is 175 ℃-205 ℃ of 120r/min film head temperature, typing, traction cutting.The sealed polyethylene plastic performance of producing is following: hot strength is that 22.78Mpa, elongation at break are 718.5%, heat seal strength is 9.8, coefficient of friction: 0.213.
Combine specific embodiment that the present invention has been carried out exemplary description above; Obvious realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or design of the present invention and technical scheme are directly applied to other occasion without improving, all in protection scope of the present invention.

Claims (6)

1. packaging for foodstuff plastic basis material film is characterized in that: comprise internal layer, intermediate layer and outer three-decker; Described internal layer adopts low density polyethylene and metallocene linear-low density polyethylene mLLDPE to process; Described intermediate layer adopts low density polyethylene and LLDPE LLDPE to process, described outer low density polyethylene and the LLDPE LLDPE of adopting.
2. according to the said packaging for foodstuff plastic basis material of claim 1 film, it is characterized in that: it is 1.8-2.2g/10min that said internal layer adopts melt index, and density is 0.923-0.926g/cm 2Low density polyethylene, melt index be 1.9-2.4g/10min, density is 0.910-0.915g/cm 2Metallocene linear-low density polyethylene mLLDPE, its quality proportioning is LDPE:mLLDPE=25-35:65-75;
It is 1.8-2.2g/10min that melt index is adopted in said intermediate layer, and density is 0.923-0.926g/cm 2Low density polyethylene and melt index be 1.9-2.2g/10min, density is 0.918-0.922g/cm 2LLDPE LLDPE, its quality proportioning is LDPE:LLDPE=35-45:55-65;
Said outer employing melt index is 0.8-2.1g/10min, and density is 0.923-0.926g/cm 2Low density polyethylene and melt index be 1.9-2.2g/10min, density is 0.918-0.922g/cm 2LLDPE LLDPE, its quality proportioning is LDPE:LLDPE=35-45:55-65.
3. according to claim 1 or 2 said packaging for foodstuff plastic basis material films, it is characterized in that: the mass ratio between said internal layer, intermediate layer and the skin is 1:1:1.
4. preparation technology according to each said packaging for foodstuff plastic basis material film of claim 1-3 is characterized in that may further comprise the steps:
Send extruder to extrude after each raw material mixed in proportion, wherein the melt temperature of extruder is 175 ℃-195 ℃, and the initial temperature of charging is 175 ℃-185 ℃; The roller bar rotating speed of main frame is 80r/min-120r/min; Carry out blown film then; Finalize the design, draw cutting at last.
5. according to the preparation technology of the said packaging for foodstuff plastic basis material of claim 4 film, it is characterized in that: the incorporation time of said raw material is 15min-20min.
6. according to the preparation technology of claim 4 or 5 said packaging for foodstuff plastic basis material films, it is characterized in that: the temperature of said film head raises from bottom to top gradually, and its temperature range is 165 ℃-205 ℃.
CN201110220639.7A 2011-08-03 2011-08-03 A kind of food package plastic base material film and production technology thereof Expired - Fee Related CN102423942B (en)

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CN102423942B CN102423942B (en) 2016-03-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102909925A (en) * 2012-10-31 2013-02-06 安徽省科汇恒达包装材料科技有限公司 Multilayer frozen polyethylene film
CN102991074A (en) * 2012-12-28 2013-03-27 昆山金盟塑料薄膜有限公司 Thin film and production method thereof
CN104385732A (en) * 2014-11-21 2015-03-04 江门市蓬江区华龙包装材料有限公司 Easy-torn film and using method thereof
CN105538856A (en) * 2016-01-18 2016-05-04 广东星格新材料有限公司 Squeeze osmosis packaging film and production process thereof
CN105667035A (en) * 2016-01-18 2016-06-15 广东星格新材料有限公司 Easy-tearing packaging film and production process thereof
CN108995995A (en) * 2018-07-07 2018-12-14 青岛金利塑料有限公司 A kind of high-air-tightness hydraulic pressure resistant polybag and preparation method thereof
CN109435393A (en) * 2018-12-28 2019-03-08 大连大富塑料彩印有限公司 A kind of high impact properties composite membrane
CN109605890A (en) * 2019-01-21 2019-04-12 河南省银丰塑料有限公司 Three-layer co-extruded ultra-low temperature heat sealing packing film

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6110549A (en) * 1997-04-30 2000-08-29 Mitsui Chemicals Inc. Sealant resin composition for use in retort film and sealant film
CN101367283A (en) * 2008-07-22 2009-02-18 黄山永新股份有限公司 Antimicrobial polyethylene film and preparing technique thereof
CN101480861A (en) * 2009-01-23 2009-07-15 石狮市新光塑料包装有限公司 Novel PE film
CN101624112A (en) * 2009-08-14 2010-01-13 黄山永新股份有限公司 Composite membrane for sauce and preparation method thereof
EP1907208B1 (en) * 2005-07-19 2011-01-26 E.I. Du Pont De Nemours And Company Film structures having improved oxygen transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6110549A (en) * 1997-04-30 2000-08-29 Mitsui Chemicals Inc. Sealant resin composition for use in retort film and sealant film
EP1907208B1 (en) * 2005-07-19 2011-01-26 E.I. Du Pont De Nemours And Company Film structures having improved oxygen transmission
CN101367283A (en) * 2008-07-22 2009-02-18 黄山永新股份有限公司 Antimicrobial polyethylene film and preparing technique thereof
CN101480861A (en) * 2009-01-23 2009-07-15 石狮市新光塑料包装有限公司 Novel PE film
CN101624112A (en) * 2009-08-14 2010-01-13 黄山永新股份有限公司 Composite membrane for sauce and preparation method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102909925A (en) * 2012-10-31 2013-02-06 安徽省科汇恒达包装材料科技有限公司 Multilayer frozen polyethylene film
CN102991074A (en) * 2012-12-28 2013-03-27 昆山金盟塑料薄膜有限公司 Thin film and production method thereof
CN104385732A (en) * 2014-11-21 2015-03-04 江门市蓬江区华龙包装材料有限公司 Easy-torn film and using method thereof
CN105538856A (en) * 2016-01-18 2016-05-04 广东星格新材料有限公司 Squeeze osmosis packaging film and production process thereof
CN105667035A (en) * 2016-01-18 2016-06-15 广东星格新材料有限公司 Easy-tearing packaging film and production process thereof
CN105538856B (en) * 2016-01-18 2018-01-09 广东星格新材料有限公司 One kind extruding infiltration packaging film and its production technology
CN108995995A (en) * 2018-07-07 2018-12-14 青岛金利塑料有限公司 A kind of high-air-tightness hydraulic pressure resistant polybag and preparation method thereof
CN109435393A (en) * 2018-12-28 2019-03-08 大连大富塑料彩印有限公司 A kind of high impact properties composite membrane
CN109605890A (en) * 2019-01-21 2019-04-12 河南省银丰塑料有限公司 Three-layer co-extruded ultra-low temperature heat sealing packing film

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