CN111452328A - Blown film containing method - Google Patents

Blown film containing method Download PDF

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Publication number
CN111452328A
CN111452328A CN202010368693.5A CN202010368693A CN111452328A CN 111452328 A CN111452328 A CN 111452328A CN 202010368693 A CN202010368693 A CN 202010368693A CN 111452328 A CN111452328 A CN 111452328A
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CN
China
Prior art keywords
film
poe
region
machine
dpe
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
CN202010368693.5A
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Chinese (zh)
Inventor
高菲
高延民
南祥
刘兰顺
邵振鹏
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.)
Shandong Huazhilin Pharmaceutical Technology Co ltd
Original Assignee
Shandong Huazhilin Pharmaceutical Technology Co ltd
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Publication date
Application filed by Shandong Huazhilin Pharmaceutical Technology Co ltd filed Critical Shandong Huazhilin Pharmaceutical Technology Co ltd
Priority to CN202010368693.5A priority Critical patent/CN111452328A/en
Publication of CN111452328A publication Critical patent/CN111452328A/en
Priority to CN202011115229.1A priority patent/CN112092328A/en
Pending legal-status Critical Current

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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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention provides a film blowing containing method. According to the technical scheme, the POE component is added in the middle layer, the temperature of each area in the barrel area of the film blowing machine is reduced by 10 ℃, and the POE is prevented from generating gelatinization, so that the function of the POE is fully exerted, and the POE is prevented from being separated out. The blown film containing method effectively isolates POE in the middle layer, so that the POE cannot be separated out, the high toughness of the POE can be fully exerted, the elongation at break of the product is improved, and the loading capacity is increased. Experimental verification shows that the product prepared by the invention is obviously superior to the conventional product in mechanical property, the elongation at break is obviously improved, and the loading capacity and the safety in use can be effectively improved. The invention enhances the strength and toughness of the bag, does not cause bag explosion in the use process, reduces the loss, solves the trouble of using the bag by customers and has better use effect.

Description

Blown film containing method
Technical Field
The invention relates to the technical field of high polymer materials, further relates to improvement of a film blowing method, and particularly relates to a film blowing containing method.
Background
The film blowing is a plastic processing method, which means a plastic processing technology that plastic particles are heated and melted and then blown into a film, and generally, a polymer is extruded to form a tubular film blank, the tubular film is blown to a required thickness by high-pressure air in a better melt flowing state, and the tubular film is cooled and shaped into the film.
POE (polyolefin elastomer) is a thermoplastic elastomer with narrow molecular weight distribution and uniform short chain branch distribution, and has outstanding performance, and the heat-resistant temperature of the material is improved, the permanent deformation is reduced, and the main mechanical properties such as tensile strength, tearing strength and the like are improved to a great extent by crosslinking the POE.
In the prior art, the problems that products without POE are poor in toughness, the product loading capacity is small and the like generally exist, the hole breaking phenomenon easily occurs, and the POE precipitation phenomenon occurs in products with POE added on the market, so that the appearance of the products is influenced.
Disclosure of Invention
The invention aims to provide a film blowing accommodation method aiming at the technical defects in the prior art, and aims to solve the technical problem that POE precipitation occurs in a film blowing product with POE added in the prior art.
The invention also aims to solve the technical problem of how to further improve the strength and the toughness of the blown film product.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for holding POE by blowing film includes such steps as isolating POE from the middle layer, preparing the inner layer from L DPE and LL DPE in 3:7 mass ratio, preparing the middle layer from L DPE, POE and LL DPE in 3:4:3 mass ratio, and preparing the outer layer from L DPE and LL DPE in 3:7 mass ratio.
Preferably, during the process performed by the film blowing machine, the temperature of the inner layer and the outer layer of the cylinder zone is as follows: 180.0 ℃ in the 1-2 region, 190.0 ℃ in the 3 region and 180.0 ℃ in the 4-6 region; the temperature of the middle layer in the machine barrel zone is as follows: 170.0 ℃ in the 1-2 region, 180.0 ℃ in the 3 region and 170.0 ℃ in the 4-6 region; when the inflation film manufacturing machine is the individual layer inflation film manufacturing machine, the die head temperature is: 170 ℃ in a region of 1-2; when the inflation film manufacturing machine is three-layer coextrusion inflation film manufacturing machine, the die head temperature is: 170 ℃ in a region of 1-3; when the film blowing machine is a three-layer co-extrusion film blowing machine, the temperature of the mouth mold is 170 ℃.
Preferably, the method comprises the following steps: adding granules into a hopper, starting an extruder after the extruder and a machine head meet the heat preservation requirement, rotating a screw at a low speed, and gradually increasing the rotating speed of the screw after a molten material passes through the machine head and is blown into a tube bubble; gathering the melted materials passing through the machine head, lifting the melted materials, and introducing air; and feeding the lifted tube bubble into a clamping roller, pressing the tube bubble into a folded film through the clamping roller, and conveying the folded film to a coiling device through a guide roller.
Preferably, after the plastic tube bubble is fed to the roller, air is blown into the tube bubble until the desired width is achieved.
Preferably, the thickness tolerance of the film is adjusted by the die gap, the air volume of the cooling air ring, and the drawing speed.
Preferably, the width tolerance of the film is adjusted by the size of the inflation.
The invention provides a film blowing containing method. According to the technical scheme, the POE component is added in the middle layer, the temperature of each area in the barrel area of the film blowing machine is reduced by 10 ℃, and the POE is prevented from generating gelatinization, so that the function of the POE is fully exerted, and the POE is prevented from being separated out. The blown film containing method effectively isolates POE in the middle layer, so that the POE cannot be separated out, the high toughness of the POE can be fully exerted, the elongation at break of the product is improved, and the loading capacity is increased. Experimental verification shows that the product prepared by the invention is obviously superior to the conventional product in mechanical property, the elongation at break is obviously improved, and the loading capacity and the safety in use can be effectively improved. The invention enhances the strength and toughness of the bag, does not cause bag explosion in the use process, reduces the loss, solves the trouble of using the bag by customers and has better use effect.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
A blown film containment method isolates POE from the interlayer.
The formula of the three-layer raw materials is as follows:
inner layer A (L DPE) B (LL DPE) 3:7
Middle layer A (L DPE) POE B (LL DPE) 3:4:3
Outer layer, a (L DPE) and B (LL DPE) 3: 7.
The blown film temperature parameters are shown in table 1 below:
TABLE 1 blown film temperature parameters
Figure BDA0002477426370000031
The film blowing process comprises the following steps:
and conveying the mixed granules of the batch number to be produced to a film blowing chamber from the mixing chamber by a post operator, starting a vacuum absorption pump, and adding the granules into a hopper. When the extruder and the machine head meet the heat preservation requirement, the screw rotates at a low speed when the extruder is started, and when the molten material passes through the machine head and is blown into a tube bubble, the rotating speed of the screw is gradually increased. The molten materials passing through the head are brought together and lifted while a small amount of air is introduced to prevent them from sticking to each other. And feeding the lifted tube bubble into a clamping roller, pressing the tube bubble into a folded film through the clamping roller, and conveying the folded film to a coiling device through a guide roller. After the plastic tube bubble is fed to the roller, air is blown into the tube bubble until the required width is achieved. The thickness tolerance of the film can be corrected by adjusting the gap of the neck ring, the air quantity of the cooling air ring and the traction speed; the width tolerance of the film is mainly adjusted by the size of the inflation.
Compared with the conventional technology, the invention reduces the temperature of each area of the film blowing machine barrel area by 10 ℃ and prevents POE from generating gelatinization. The function of POE can be fully exerted, and the POE is prevented from being separated out.
The new and old formulations were subjected to performance comparison tests, the results of which are shown in table 2 below:
TABLE 2 comparison of New and old recipe test parameters
Figure BDA0002477426370000041
The experimental results show that the product of the new technology is obviously superior to the product of the original formula in mechanical property, the toughness reflected by the elongation at break is greatly improved, and the loading capacity and the safety of customers can be effectively improved.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for holding film by blowing is characterized in that POE is isolated in an intermediate layer, wherein the inner layer is composed of L DPE and LL DPE according to the mass ratio of 3:7, the intermediate layer is composed of L DPE, POE and LL DPE according to the mass ratio of 3:4:3, and the outer layer is composed of L DPE and LL DPE according to the mass ratio of 3: 7.
2. A film blow containment method according to claim 1, wherein during the method being carried out by a film blowing machine, the temperatures of the inner and outer layers of the barrel zone are: 180.0 ℃ in the 1-2 region, 190.0 ℃ in the 3 region and 180.0 ℃ in the 4-6 region; the temperature of the middle layer in the machine barrel zone is as follows: 170.0 ℃ in the 1-2 region, 180.0 ℃ in the 3 region and 170.0 ℃ in the 4-6 region; when the inflation film manufacturing machine is the individual layer inflation film manufacturing machine, the die head temperature is: 170 ℃ in a region of 1-2; when the inflation film manufacturing machine is three-layer coextrusion inflation film manufacturing machine, the die head temperature is: 170 ℃ in a region of 1-3; when the film blowing machine is a three-layer co-extrusion film blowing machine, the temperature of the mouth mold is 170 ℃.
3. A blown film containment method according to claim 1, comprising the steps of: adding granules into a hopper, starting an extruder after the extruder and a machine head meet the heat preservation requirement, rotating a screw at a low speed, and gradually increasing the rotating speed of the screw after a molten material passes through the machine head and is blown into a tube bubble; gathering the melted materials passing through the machine head, lifting the melted materials, and introducing air; and feeding the lifted tube bubble into a clamping roller, pressing the tube bubble into a folded film through the clamping roller, and conveying the folded film to a coiling device through a guide roller.
4. A method of blow moulding containment according to claim 3, characterised in that after the plastic blister is fed to the roll, air is blown into the blister until the desired width is achieved.
5. A blown film containment method according to claim 3, wherein the thickness tolerance of the film is adjusted by the die gap, the amount of cooling air supplied to the cooling air ring, and the drawing speed.
6. A blown film containment method according to claim 3, wherein the width tolerance of the film is adjusted by the size of the inflation.
CN202010368693.5A 2020-05-02 2020-05-02 Blown film containing method Pending CN111452328A (en)

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CN202010368693.5A CN111452328A (en) 2020-05-02 2020-05-02 Blown film containing method
CN202011115229.1A CN112092328A (en) 2020-05-02 2020-10-19 Blown film containing method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114013143A (en) * 2021-12-03 2022-02-08 山东华致林医药科技有限公司 High-temperature-resistant PE film
CN114148620A (en) * 2021-12-03 2022-03-08 山东华致林医药科技有限公司 Breathing bag convenient to take

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JP3052398B2 (en) * 1991-02-21 2000-06-12 昭和電工株式会社 Medical bag
JP4087304B2 (en) * 2003-07-23 2008-05-21 三井化学株式会社 Olefin elastomer composition for foam and use thereof
CN101665172B (en) * 2009-09-04 2011-02-09 浙江大东南包装股份有限公司 Packaging film of CPP agricultural product and preparation method thereof
CN201941208U (en) * 2011-02-28 2011-08-24 海宁市粤海彩印有限公司 Low-temperature impact-resistant polyethylene film
CN102416747B (en) * 2011-08-05 2015-07-08 大连瑞贤达塑胶有限公司 Plastic substrate film for food package and processing technology
CN103568425B (en) * 2013-09-26 2015-09-16 浙江诚信包装材料有限公司 Stretch hood film with weight capacity and preparation method thereof
CN104175676B (en) * 2014-08-29 2016-06-08 东莞市正新包装制品有限公司 A kind of high bright polyethylene shrink film and film-blowing process thereof
CN104802482A (en) * 2015-04-10 2015-07-29 中国科学院长春应用化学研究所 Three-layer co-extruded PP (polypropylene)/PE (polyethylene)/PP upward-blown film and preparation method thereof
CN108189506B (en) * 2018-01-16 2019-12-20 青岛东海包装产业有限公司 Heat-sealing repeated easy-to-tear PE film and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114013143A (en) * 2021-12-03 2022-02-08 山东华致林医药科技有限公司 High-temperature-resistant PE film
CN114148620A (en) * 2021-12-03 2022-03-08 山东华致林医药科技有限公司 Breathing bag convenient to take

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