CN111532011A - Puncture-resistant high-strength film and preparation method thereof - Google Patents
Puncture-resistant high-strength film and preparation method thereof Download PDFInfo
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- CN111532011A CN111532011A CN202010282210.XA CN202010282210A CN111532011A CN 111532011 A CN111532011 A CN 111532011A CN 202010282210 A CN202010282210 A CN 202010282210A CN 111532011 A CN111532011 A CN 111532011A
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- 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
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- 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
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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- 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
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- 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
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- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a puncture-resistant high-strength film and a preparation method thereof, and relates to the technical field of packaging films. The technical key points are as follows: the puncture-resistant high-strength film comprises an inner layer, a middle layer and an outer layer, wherein the inner layer comprises the following components in parts by weight: c8 metallocene polyethylene: 34-41 parts; c6 metallocene polyethylene: 11-13 parts; a slip agent: 0.5-0.6 part; the middle layer comprises the following components in parts by weight: c8 metallocene polyethylene: 9.5-10 parts; the outer layer comprises the following components in parts by weight: LLDPE: 8-10 parts; LDPE (Low-Density polyethylene): 0.8 to 1.2 portions. The preservative film prepared from the raw materials has the advantages of large dart impact index and good puncture resistance.
Description
Technical Field
The invention relates to the technical field of packaging films, in particular to a puncture-resistant high-strength film and a preparation method thereof.
Background
The existing vacuum-pumping package of frozen meat products requires extremely high dart impact and puncture resistance, and the puncture resistance is improved by adopting a multilayer composite base material or PE + EVA through an electron beam crosslinking process at present, but the finished product prepared by the composite base material or the combination of PE + EVA has the defects of complex manufacturing process and higher manufacturing cost.
The Chinese utility model patent with the publication number of CN208392807U discloses a novel special ice bag film for refrigeration, which comprises a surface layer and a base layer, wherein the surface layer is arranged on the upper surface of the base layer, the surface layer is a polyester layer, and the base layer comprises a printing layer, an adhesive layer, a first PE layer, a second PE layer and a third PE layer which are arranged in sequence from top to bottom; the lower surface of the polyester layer is compounded with the printing layer, the printing layer is glued with the upper surface of the first PE layer through the adhesive layer, the lower surface of the first PE layer is compounded with the second PE layer, and the second PE layer is compounded with the third PE layer. The ice bag film can solve the defects of complex material, complex manufacturing process and higher manufacturing cost, but the raw material components of the ice bag film adopt a PE mode, and in the actual test, the dart impact index of 80um of the PE blown film is 150-300g, which is 1/8-1/10 of a composite base material.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the puncture-resistant high-strength film, the dart drop impact performance index of the puncture-resistant high-strength film is improved by 8-12 times and reaches more than 2000g, and the puncture-resistant high-strength film can replace a composite film and an electron beam crosslinking blend film and is applied to the field of frozen food packaging.
The second purpose of the invention is to provide a preparation method of the puncture-resistant high-strength membrane, which has the advantages of easily available raw materials, low cost, simple preparation process and easy operation.
In order to achieve the first purpose, the invention provides the following technical scheme:
the puncture-resistant high-strength film comprises an inner layer, a middle layer and an outer layer, wherein the inner layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 34-41 parts;
c6 metallocene polyethylene: 11-13 parts;
a slip agent: 0.5-0.6 part;
the middle layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 9.5-10 parts;
the outer layer comprises the following components in parts by weight:
LLDPE: 8-10 parts;
LDPE (Low-Density polyethylene): 0.8 to 1.2 portions.
By adopting the technical scheme, the puncture-resistant high-strength film adopts a solvent-free formula and a production process in consideration of the safety and sanitation of food packaging, but the solvent-free formula and the production process have the problems of higher friction coefficient and poor opening performance, so in order to improve the equipment adaptability of PE, the formability, the puncture resistance, the friction coefficient reduction and other characteristics of a bag body need to be considered, and the formula can meet various requirements. The C8 metallocene polyethylene has strong flexibility, can improve the anti-falling and anti-puncture performance of the film, adopts the combination of low-density low-melting-point C8+ LLDPE + LDPE, does not adopt middle-density and high-density PE, has low formula density and strong toughness of the film, and adopts pure material C8 in the middle layer to greatly improve the impact resistance and the anti-puncture performance of the dart.
Further preferably, the inner layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 38 parts of (B);
c6 metallocene polyethylene: 12 parts of (1);
a slip agent: 0.5 part;
the middle layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 10 parts of (A);
the outer layer comprises the following components in parts by weight:
LLDPE: 9 parts of (1);
LDPE (Low-Density polyethylene): 1 part.
By adopting the technical scheme, the components used in each layer are the optimal components, and the puncture-resistant high-strength film prepared from the components in parts by weight has good puncture resistance.
More preferably, the slip agent is silicone powder.
By adopting the technical scheme, the silicone powder is a non-migratory inorganic slip agent, and considering that the solvent-free composite material has higher friction coefficient and poor opening property, the silicone powder is particularly added into the PE formula, and the friction coefficient is reduced by using the non-migratory slip agent.
More preferably, the inner layer also comprises 0.3-0.5 weight part of inorganic antisticking agent.
By adopting the technical scheme, a certain amount of inorganic anti-sticking agent is added into the inner layer, so that the film can be prevented from sticking to each other due to the absorption of moisture in the air after being rolled.
More preferably, the thickness of the inner layer is 20-30 μm, the thickness of the middle layer is 45-50 μm, and the thickness of the outer layer is 30-40 μm.
By adopting the technical scheme, each layer is of proper thickness, the prepared high-strength film has the characteristic of high stiffness, the bag is not easy to puncture, the wear resistance is good, and the impact strength is high.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation method of a puncture-resistant high-strength film comprises the following steps:
respectively adding the inner layer, the middle layer and the outer layer into three charging barrels of an extruder, forming a melt under the action of a heating device and a screw of the extruder, and extruding the melt into a tubular object through a die orifice of an annular die head; after the tubular object leaves the die orifice, the tubular object is blown into a bubble film under the action of blowing compressed air into the central hole of the die orifice; the bubble-shaped film is pulled to rise by a traction mechanism, cooled and shaped by an air ring, and clamped flat by a herringbone plate; and (3) clamping by a traction roller to form a double-layer film, corona the outer surface of the double-layer film by a corona device, cutting edges, slicing and winding to obtain the puncture-resistant high-strength film.
By adopting the technical scheme, the raw materials are easy to obtain, the cost is low, the preparation process is simple, and the obtained puncture-resistant high-strength film has the advantages of high tensile strength and good puncture resistance.
More preferably, the puncture-resistant high-strength film has a blow-up ratio of 2.5 to 3 and a draw-down ratio of 4.5 to 7.5.
By adopting the technical scheme, the blow-up ratio is the transverse expansion multiple of the film, the film is actually transversely stretched, the stretching can generate a certain degree of orientation effect on plastic molecules, and the blow-up ratio is increased, so that the transverse strength of the film is improved. However, the blow-up ratio cannot be too large, otherwise, the bubble is easy to be unstable, and the film is easy to wrinkle; the draw ratio is the stretch ratio in the machine direction, which gives the film an orienting effect in the take-up direction. If the traction ratio is too large, the thickness of the film is difficult to control, and even the film is broken possibly, so that the film breaking phenomenon is caused; the invention adopts proper blow-up ratio and traction ratio to endow the film with good tensile strength.
More preferably, the extrusion temperature of the extruder is controlled at 160-175 ℃.
By adopting the technical scheme, the extrusion temperature is too high, the resin is easy to decompose, the film is brittle, the longitudinal tensile strength is obviously reduced particularly, if the temperature is too low, the resin is not well plasticized, the expansion stretching cannot be smoothly carried out, the tensile strength of the film is low, the surface gloss and the transparency are poor, and even wood annual ring-shaped patterns and non-melted crystal nuclei appear.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts a three-layer combination mode, adopts the combination of low-density low-melting point C8+ LLDPE + LDPE, does not adopt middle and high density PE, has low film formula density and strong toughness, and can greatly improve the impact resistance and puncture resistance of the dart by adopting pure material C8 in the middle layer;
(2) the raw materials are easy to obtain, the cost is low, the preparation process is simple, and the obtained puncture-resistant high-strength film has the advantages of high tensile strength and good puncture resistance;
(3) in the preparation method, the dart drop performance is greatly improved by adopting a low-temperature heating interval and a low traction ratio, and the balance between the dart drop performance and the blowing ratio is better.
Drawings
FIG. 1 is a flow chart of a process for preparing a puncture-resistant high-strength film in example 1 of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: the puncture-resistant high-strength film comprises the following components in parts by weight as shown in Table 1, and is prepared by the following steps:
respectively adding the inner layer, the middle layer and the outer layer into three charging barrels of an extruder, forming a melt under the action of a heating device and a screw of the extruder, controlling the extrusion temperature at 160 ℃, and extruding the melt into a tubular object through a die orifice of an annular die head; after the tubular object leaves the die orifice, the tubular object is blown into a bubble film under the action of blowing compressed air into the central hole of the die orifice, and the blow-up ratio of the tubular object is 2.5; the bubble-shaped film is pulled to rise by a traction mechanism, is cooled and shaped by an air ring, is clamped to be flat by soaking of a herringbone plate, and the traction ratio is 4.5; and (3) clamping by a traction roller to form a double-layer film, corona the outer surface of the double-layer film by a corona device, cutting edges, slicing and winding to obtain the puncture-resistant high-strength film. The production speed is 20m/min, and the melt pressure of the extruder is less than 45 MPa.
In this embodiment, the thickness of the inner layer is 20 μm, the thickness of the middle layer is 45 μm, and the thickness of the outer layer is 30 μm, wherein the slip agent is silicone powder.
Examples 2 to 6: a puncture-resistant high-strength film, which is different from example 1 in that each component and the corresponding parts by weight thereof are shown in table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7: the puncture-resistant high-strength film is prepared by the following steps of:
respectively adding the inner layer, the middle layer and the outer layer into three charging barrels of an extruder, forming a melt under the action of a heating device and a screw of the extruder, controlling the extrusion temperature at 175 ℃, and extruding the melt into a tubular object through a die orifice of an annular die head; after the tubular object leaves the die orifice, the tubular object is blown into a bubble film under the action of blowing compressed air into the central hole of the die orifice, and the blow-up ratio of the tubular object is 3; the bubble-shaped film is pulled to rise by a traction mechanism, is cooled and shaped by an air ring, is clamped to be flat by soaking of a herringbone plate, and the traction ratio is 7.5; and (3) clamping by a traction roller to form a double-layer film, corona the outer surface of the double-layer film by a corona device, cutting edges, slicing and winding to obtain the puncture-resistant high-strength film. The production speed is 20m/min, and the melt pressure of the extruder is less than 45 MPa.
Example 8: the puncture-resistant high-strength film is different from the film in example 4 in that the inner layer also comprises 0.4 weight part of inorganic anti-sticking agent which is a product of a brand AB-20LD manufactured by Beijing Asian Intelligent Union company.
Comparative example 1: a packaging film which differs from example 1 in that no C8 metallocene polyethylene was added.
Comparative example 2: a packaging film which differs from example 1 in that no C6 metallocene polyethylene was added.
Comparative example 3: a packaging film differing from example 1 in that a high density polyethylene HDPE was used instead of the C8 metallocene polyethylene.
Performance testing
The puncture-resistant high-strength films prepared in examples 1 to 8 and the packaging films prepared in comparative examples 1 to 3 were subjected to tests, respectively, and the test results are shown in the following table 2.
Puncture strength: the test was carried out according to the test method for puncture strength in GB/T10004-2008 "Plastic composite film for packaging, bag Dry compounding, extrusion compounding", and each sample was tested with a 2.5mm needle.
Dart impact: each sample was tested according to GB/T9639.1-2008 "free falling dart method for impact resistance test method for Plastic films and sheets", height 80 um.
Oxygen transmission capacity test: the samples were tested by GB/T1038-2000 "pressure differential method for testing gas permeability of Plastic films and sheets". When the oxygen transmission capacity is less than or equal to 30cc/(cm 2 s & Pa), marking as qualified; when the oxygen transmission amount was more than 30cc/(cm 2. multidot.s.Pa), it was judged as defective.
Water vapor transmission test: each sample was tested using GB1037-88 "test methods for water vapor permeability of plastic films and sheets". When the water vapor transmission capacity is less than or equal to 8g/(m < 2 >. 24h), the product is marked as qualified; when the water vapor transmission amount is more than 8g/(m 2. multidot.24 h), it is judged as a fail.
As can be seen from the test data in table 2, examples 1 to 8 have significantly better puncture strength and dart impact property than comparative examples 1 to 3, and both oxygen transmission rate and water vapor transmission rate were acceptable. Of these, example 4 is superior to the other examples, while example 8 is the most preferred example, having the highest strength and puncture resistance.
Table 2 results of performance testing
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The puncture-resistant high-strength film is characterized by comprising an inner layer, a middle layer and an outer layer, wherein the inner layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 34-41 parts;
c6 metallocene polyethylene: 11-13 parts;
a slip agent: 0.5-0.6 part;
the middle layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 9.5-10 parts;
the outer layer comprises the following components in parts by weight:
LLDPE: 8-10 parts;
LDPE (Low-Density polyethylene): 0.8 to 1.2 portions.
2. The puncture-resistant high-strength film according to claim 1, wherein the inner layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 38 parts of (B);
c6 metallocene polyethylene: 12 parts of (1);
a slip agent: 0.5 part;
the middle layer comprises the following components in parts by weight:
c8 metallocene polyethylene: 10 parts of (A);
the outer layer comprises the following components in parts by weight:
LLDPE: 9 parts of (1);
LDPE (Low-Density polyethylene): 1 part.
3. The puncture-resistant, high-strength film according to claim 1, wherein the slip agent is silicone powder.
4. The puncture-resistant high-strength film according to claim 1, wherein the inner layer further comprises 0.3 to 0.5 parts by weight of an inorganic antisticking agent.
5. The puncture-resistant high-strength film according to claim 1, wherein the thickness of the inner layer is 20-30 μm, the thickness of the middle layer is 45-50 μm, and the thickness of the outer layer is 30-40 μm.
6. The method for preparing the puncture-resistant high-strength film according to any one of claims 1 to 5, comprising the steps of:
respectively adding the inner layer, the middle layer and the outer layer into three charging barrels of an extruder, forming a melt under the action of a heating device and a screw of the extruder, and extruding the melt into a tubular object through a die orifice of an annular die head; after the tubular object leaves the die orifice, the tubular object is blown into a bubble film under the action of blowing compressed air into the central hole of the die orifice; the bubble-shaped film is pulled to rise by a traction mechanism, cooled and shaped by an air ring, and clamped flat by a herringbone plate; and (3) clamping by a traction roller to form a double-layer film, corona the outer surface of the double-layer film by a corona device, cutting edges, slicing and winding to obtain the puncture-resistant high-strength film.
7. The method for producing a puncture-resistant high-strength film according to claim 6, wherein the puncture-resistant high-strength film has a blow-up ratio of 2.5 to 3 and a draw-down ratio of 4.5 to 7.5.
8. The method for preparing the puncture-resistant high-strength film as claimed in claim 6, wherein the extrusion temperature of the extruder is controlled at 160-175 ℃.
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| CN202010282210.XA CN111532011A (en) | 2020-04-11 | 2020-04-11 | Puncture-resistant high-strength film and preparation method thereof |
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| CN202010282210.XA CN111532011A (en) | 2020-04-11 | 2020-04-11 | Puncture-resistant high-strength film and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371803A (en) * | 2001-02-28 | 2002-10-02 | 中国医学科学院基础医学研究所 | Non-polyvinyl chloride compound film material for package of intravenous medicine |
| CN103770422A (en) * | 2014-01-23 | 2014-05-07 | 黄山永新股份有限公司 | High-stiffness puncture-resistant low-friction coefficient composite film and preparation method thereof |
| CN104512080A (en) * | 2014-12-12 | 2015-04-15 | 浙江诚德包装有限公司 | Low-temperature dropping resistant film and its application |
| CN108656688A (en) * | 2018-04-25 | 2018-10-16 | 湛江包装材料企业有限公司 | A kind of special silicone type wear rib packet BOPP film and preparation method 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 |
-
2020
- 2020-04-11 CN CN202010282210.XA patent/CN111532011A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371803A (en) * | 2001-02-28 | 2002-10-02 | 中国医学科学院基础医学研究所 | Non-polyvinyl chloride compound film material for package of intravenous medicine |
| CN103770422A (en) * | 2014-01-23 | 2014-05-07 | 黄山永新股份有限公司 | High-stiffness puncture-resistant low-friction coefficient composite film and preparation method thereof |
| CN104512080A (en) * | 2014-12-12 | 2015-04-15 | 浙江诚德包装有限公司 | Low-temperature dropping resistant film and its application |
| CN108656688A (en) * | 2018-04-25 | 2018-10-16 | 湛江包装材料企业有限公司 | A kind of special silicone type wear rib packet BOPP film and preparation method 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 |
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Application publication date: 20200814 |