CN104691071A - Puncture-resistant packaging film and preparation method thereof - Google Patents
Puncture-resistant packaging film and preparation method thereof Download PDFInfo
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- CN104691071A CN104691071A CN201510076827.5A CN201510076827A CN104691071A CN 104691071 A CN104691071 A CN 104691071A CN 201510076827 A CN201510076827 A CN 201510076827A CN 104691071 A CN104691071 A CN 104691071A
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- density polyethylene
- layer
- puncture
- packaging film
- membrane layer
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Classifications
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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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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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
- B32B27/18—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
- B32B27/32—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
- B32B27/32—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
Abstract
The invention discloses a puncture-resistant packaging film and a preparation method thereof. The puncture-resistant packaging film adopts a three-layer composite structure consisting of an outer thin film layer, a middle thin film layer and an inner thin film layer, wherein the outer thin film layer is prepared from high-density polyethylene; the middle thin film layer is prepared from high-density polyethylene and metallocene linear low-density polyethylene; the inner thin film layer is prepared from metallocene linear low-density polyethylene, low-density polyethylene and a polyolefin elastomer. Compared with a conventional hardware packaging composite film, the puncture-resistant packaging film has the advantages of excellent mechanical property, proper film surface friction coefficient and the like and is suitable for any automatic packaging equipment.
Description
Technical field
The present invention relates to packaging film field, particularly relate to packaging film of a kind of puncture-resistant and preparation method thereof.
Background technology
Tradition hardware industry packaging material used are composite membrane, and multiple monofilm to be combined with each other by adhesive and to prepare by described composite membrane.But this composite membrane exists the shortcoming of easy absciss layer, not puncture-resistant, make handware in transportation, there will be bale broken phenomenon.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, packaging film of a kind of puncture-resistant and preparation method thereof is provided in the present invention, the packaging film of described puncture-resistant is that one is applicable to the wrapping Three-layer co-extrusion plastic film of five metals, compared with the composite membrane packed with traditional five metals, there is the advantages such as excellent in mechanical performance, film skin-friction coefficient be suitable, be intended to solve the problem that the existing composite membrane for handware packaging exists easy absciss layer, not puncture-resistant.
Technical scheme of the present invention is as follows:
A packaging film for puncture-resistant, wherein, the packaging film of described puncture-resistant is three-layer composite structure, is divided into outer membrane layer, middle level thin layer and internal layer membrane layer;
The raw material of outer membrane layer consists of high density polyethylene (HDPE);
The raw material of middle level thin layer consists of high density polyethylene (HDPE) and metallocene linear-low density polyethylene;
The raw material of internal layer membrane layer consists of metallocene linear-low density polyethylene, low density polyethylene (LDPE) and polyolefin elastomer.
The packaging film of described puncture-resistant, wherein, according to the mass fraction, the content of high density polyethylene (HDPE) is 40-60 part to the raw material composition of middle level thin layer, and the content of metallocene linear-low density polyethylene is 40-60 part.
The packaging film of described puncture-resistant, wherein, according to the mass fraction, the content of low density polyethylene (LDPE) is 10-30 part to the raw material composition of internal layer membrane layer, and the content of metallocene linear-low density polyethylene is 40-60 part, and the content of polyolefin elastomer is 20-40 part.
The packaging film of described puncture-resistant, wherein, in outer membrane layer, the density of described high density polyethylene (HDPE) is 0.951g/cm
3, melt index MI is 1.1g/10min.
The packaging film of described puncture-resistant, wherein, described in the thin layer of middle level, the density of metallocene linear-low density polyethylene is 0.926g/cm
3, melt index MI is 0.8g/10min; The density of described high density base ethene is 0.951g/cm
3, melt index MI is 1.1g/10min.
The packaging film of described puncture-resistant, wherein, the density of the metallocene linear-low density polyethylene of internal layer membrane layer is 0.918g/cm
3, melt index MI is 1g/10min; The density of described low density polyethylene is 0.923g/cm
3, melt index MI is 4g/10min; The density of described polyolefin elastomer is 0.870g/cm
3, melt index is 1g/10min.
The packaging film of described puncture-resistant, wherein, the gross thickness of the packaging film of described puncture-resistant is 60 μm ~ 80 μm, and the thickness of outer membrane layer accounts for the 28-35% of gross thickness; The thickness of internal layer membrane layer accounts for 40% ~ 50% of gross thickness; Surplus is the thickness of middle level thin layer.
A preparation method for the packaging film of puncture-resistant as above, wherein, comprises the following steps:
Screw extruder high density polyethylene (HDPE) being poured into outer membrane layer is mixing; After high density polyethylene (HDPE) and metallocene linear-low density polyethylene fully mix in proportion, the screw extruder pouring middle level thin layer into is mixing; After metallocene linear-low density polyethylene, polyolefin elastomer and low density polyethylene (LDPE) fully being mixed in proportion, the screw extruder pouring internal layer membrane layer into is mixing;
The flow-like three-layer thin-film raw material that present after mixing are transported to three-layer co-extruded extruder film head simultaneously and melt extrude, and mediate in bubble embryo, by the draw of upper traction rotation tractor, film bubble is cooling forming under the effect of cooling vane.
The preparation method of the packaging film of described puncture-resistant, wherein, the extruder temperature of outer membrane layer screw extruder is 150 ~ 170 DEG C, and its head temperature is 165 ~ 180 DEG C; The extruder temperature of middle level thin layer screw extruder is 155 ~ 165 DEG C, and its head temperature is 165 ~ 185 DEG C DEG C; The extruder temperature of internal layer membrane layer screw extruder is 155 ~ 165 DEG C, and its head temperature is 165 ~ 185 DEG C.
The preparation method of the packaging film of described puncture-resistant, wherein, the rotating speed of the screw rod of outer membrane layer screw extruder, middle level thin layer screw extruder and internal layer membrane layer screw extruder is 20 ~ 40r/min, extrudes tonnage and is 25 ~ 35MPa.
Beneficial effect: the packaging film of a kind of puncture-resistant provided by the present invention, for three-layer co-extruded packaging film, by the collocation of every layer of different materials, make packaging film of the present invention compared with traditional five metals packaging composite film, have excellent in mechanical performance, film skin-friction coefficient suitable, corrosion-resistant, fall the not advantage such as bale broken.And due to packaging film heat-sealing temperature wide ranges 110-150 DEG C of the present invention, be applicable to the High-Speed Automatic packaging facilities that society exists.When packaging film of the present invention is used for five metals packaging film, there will not be absciss layer and puncture-resistant, reduce the phenomenon occurring bale broken in transportation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the packaging film of puncture-resistant of the present invention.
Detailed description of the invention
The invention provides packaging film of a kind of puncture-resistant and preparation method thereof, for making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The packaging film of a kind of puncture-resistant provided by the present invention, as shown in Figure 1, comprises outer membrane layer 1, middle level thin layer 2 and internal layer membrane layer 3, forms by three-layer co-extruded blowing up is air-cooled.
Wherein, the constituent of outer membrane layer 1 is single high density polyethylene (HDPE) (HDPE); The constituent of middle level thin layer 2 is high density polyethylene (HDPE) and metallocene linear-low density polyethylene, and according to the mass fraction, the content of high density polyethylene (HDPE) is 40-60 part, and the content of metallocene linear-low density polyethylene is 40-60 part; The constituent of internal layer membrane layer 3 is low density polyethylene (LDPE) (LDPE), metallocene linear-low density polyethylene (m-LLDPE) and polyolefin elastomer (POE), according to the mass fraction, the content of low density polyethylene (LDPE) is 10-30 part, the content of metallocene linear-low density polyethylene is 40-60 part, and the content of polyolefin elastomer is 20-40 part.
The gross thickness of described being folded without breaking packaging film is 60 μm ~ 80 μm, and the thickness of outer membrane layer 1 accounts for the 28-35% of gross thickness; Internal layer membrane layer 2 is hot sealing layer, and its thickness accounts for 40% ~ 50% of gross thickness; Surplus is the thickness of middle level thin layer 3.
Outer membrane layer material selects high density polyethylene (HDPE), due to its non-hygroscopic and steam-preventing had, be particularly useful for the packaging of handware, and hardness, hot strength, wearability, electrical insulating property, toughness and cold resistance is all better.Middle level film layer material selects high density polyethylene (HDPE) and metallocene linear-low density polyethylene, metallocene linear-low density polyethylene, has remarkable hot strength, impact strength and puncture resistance.The combination middle level thin layer of high density polyethylene (HDPE) and metallocene linear-low density polyethylene strengthens deflection and toughness, makes packaging film resistance to impact good, and is not easily pierced, even if packaging film is pierced, opening is also not easy to expand.Internal layer membrane layer material selects low density polyethylene (LDPE), metallocene linear-low density polyethylene and polyolefin elastomer, low density polyethylene (LDPE), and molding processibility is good, is applicable to the various moulding process of thermoplastic molding's processing, in improving, the processing stability of internal layer.Metallocene linear-low density polyethylene m-LLDPE, has remarkable hot strength, impact strength and puncture resistance.The strength character of these brilliances becomes universal packaging film resin together with good drawing-off performance.Because the melt index of metallocene low density polyethylene (LDPE) is all lower, so need to add polyolefin elastomer and low density polyethylene (LDPE) to improve processing characteristics in internal layer membrane layer film.Preferably, can select the metallocene linear-low density polyethylene containing opening agent and slipping agent, its performance is more excellent.The content of opening agent and slipping agent is appropriate, and different manufacturers or its content of different model can be different, do not repeat and limit at this.
Preferably, in outer membrane layer material, the density of described high density polyethylene (HDPE) is 0.951g/cm
3(ASTM D-1505), melt index MI is 1.1g/10min (ASTM D-1238,190 DEG C/2.16kg).
In the film layer material of middle level, the density of described metallocene linear-low density polyethylene is 0.92g/cm
3(ISO1183), melt index MI is 0.8g/10min (ISO1133); The density of described high density base ethene is 0.951g/cm
3(ASTM D-1505), melt index MI is 1.1g/10min (ASTMD-1238,190 DEG C/2.16kg).
In internal layer membrane layer material, the density of described metallocene linear-low density polyethylene is 0.918g/cm
3, melt index MI is 1g/10min (ASTM D-1238); The density of described low density polyethylene is 0.92g/cm
3(ISO1183), melt index MI is 4g/10min (ISO1133,230 DEG C/2.16kg).The density of described polyolefin elastomer is 0.870g/cm
3(ASTMD-1505), melt index is 1g/10min (ASTM D-1238,190 DEG C/2.16kg).
The preparation method of described being folded without breaking packaging film is also provided in the present invention, specifically comprises the following steps:
The preparation of S1, outer membrane layer film: high density polyethylene (HDPE) is directly poured into outer membrane layer screw extruder mixing.Wherein, the extruder temperature of outer membrane layer screw extruder is 150 ~ 170 DEG C, and the head temperature of its screw extruder is 165 ~ 180 DEG C.The rotating speed of described screw rod is 20 ~ 40r/min, and extruding tonnage is 25 ~ 35MPa.
The preparation of S2, middle level thin layer film: after high density polyethylene (HDPE) and metallocene linear-low density polyethylene fully being mixed in proportion, pour middle level thin layer screw extruder into mixing.Wherein, the extruder temperature of middle level thin layer screw extruder is 155 ~ 165 DEG C, and the head temperature of its screw extruder is 165 ~ 185 DEG C.The rotating speed of described screw rod is 20 ~ 40r/min, and extruding tonnage is 25 ~ 35MPa.
The preparation of S3, internal layer membrane layer film: after metallocene linear-low density polyethylene, polyolefin elastomer and low density polyethylene (LDPE) fully being mixed in proportion, pour internal layer membrane layer screw extruder into mixing.Wherein, the extruder temperature of internal layer membrane layer screw extruder is 155 ~ 165 DEG C, and the head temperature of its screw extruder is 165 ~ 185 DEG C.The rotating speed of described screw rod is 20 ~ 40r/min, and extruding tonnage is 25 ~ 35MPa.
S4, extrusion molding co-extrusion blowing up are air-cooled: the flow-like three-layer thin-film raw material that present after mixing are transported to three-layer co-extruded extruder film head simultaneously, three kinds of flow-like raw material melt extrude jointly at extruder head, mediate in bubble embryo, by the draw of upper traction rotation tractor, film bubble is cooling forming under the effect of cooling vane.Finally by the curling described being folded without breaking packaging film of wrap-up.Further, the rim charge produced in blown film process, through retracting device, recycles.
Below by way of specific embodiment, the present invention will be further described.
Embodiment 1
The packaging film of described puncture-resistant is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the packaging film of described puncture-resistant is 60 μm, outer membrane layer thickness is 16.8 ~ 21 μm, middle level thin film layer thickness is 9 ~ 19.2 μm, internal layer membrane layer thickness be 24 ~ 30 μm (because the thickness of co-extrusion film cannot be measured accurate side, so what provide in embodiment is number range).Wherein, middle level thin layer consist of m-LLDPE and HDPE, mass parts is respectively 50 parts, 50 parts; Internal layer membrane layer consist of m-LLDPE, LDPE and POE, mass parts is 50 parts, 20 parts, 30 parts.The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 2
The packaging film of described puncture-resistant is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of the packaging film of described puncture-resistant is 80 μm, and outer membrane layer thickness is 22.4 ~ 28 μm, middle level thin film layer thickness is 12 ~ 25.6 μm, and internal layer membrane layer thickness is 32 ~ 40 μm.Wherein, middle level thin layer consist of m-LLDPE and HDPE, mass parts is respectively 50 parts, 50 parts; Internal layer membrane layer consist of m-LLDPE, LDPE and POE, mass parts is 60 parts, 20 parts, 20 parts.
The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 3
Described being folded without breaking packaging film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of described being folded without breaking packaging film is 70 μm, and outer membrane layer thickness is 19.6 ~ 24.5 μm, middle level thin film layer thickness is 10.5 ~ 22.4 μm, and internal layer membrane layer thickness is 28 ~ 35 μm.Wherein, middle level thin layer consist of m-LLDPE and HDPE, mass parts is respectively 60 parts, 40 parts; Internal layer membrane layer consist of m-LLDPE, LDPE and POE, mass parts is respectively 50 parts, 20 parts, 30 parts.
The key technical indexes of the present embodiment is shown in Table 1.
Embodiment 4
Described being folded without breaking packaging film is prepared according to above-mentioned technique, in the present embodiment, the gross thickness of described being folded without breaking packaging film is 60 μm, and outer membrane layer thickness is 13.2 ~ 16.8 μm, middle level thin film layer thickness is 13.2 ~ 22.8 μm, and internal layer membrane layer thickness is 24 ~ 30 μm.Wherein, middle level thin layer consist of m-LLDPE and HDPE, mass parts is respectively 40 parts, 60 parts; Internal layer membrane layer consist of m-LLDPE, LDPE and POE, mass parts is respectively 50 parts, 25 parts, 25 parts.
The key technical indexes of the present embodiment is shown in Table 1.
The performance test results of the packaging film of table 1 embodiment 1 ~ 4
The packaging film of above-described embodiment 1 ~ 4 is respectively used to the metal screws of the weight of packaging 2 jin, packaging bag is highly freely fallen 5 times from 4m, embodiment 1 ~ 4 packaging bag of making all not bale brokens.
In sum, the packaging film of puncture-resistant provided by the present invention is three-layer co-extruded packaging film, by the collocation of every layer of different materials, obtained under certain process conditions, compared with traditional five metals packaging composite film, there is excellent in mechanical performance, film skin-friction coefficient suitably, fall the not advantage such as bale broken, heat-sealing temperature wide ranges 110-150 DEG C, be applicable to the High-Speed Automatic packaging facilities that society exists, there is good economic benefit, provide a kind of new packaging material to hardware industry.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (10)
1. a packaging film for puncture-resistant, is characterized in that, the packaging film of described puncture-resistant is three-layer composite structure, is divided into outer membrane layer, middle level thin layer and internal layer membrane layer;
The raw material of outer membrane layer consists of high density polyethylene (HDPE);
The raw material of middle level thin layer consists of high density polyethylene (HDPE) and metallocene linear-low density polyethylene;
The raw material of internal layer membrane layer consists of metallocene linear-low density polyethylene, low density polyethylene (LDPE) and polyolefin elastomer.
2. the packaging film of puncture-resistant according to claim 1, is characterized in that, according to the mass fraction, the content of high density polyethylene (HDPE) is 40-60 part to the raw material composition of middle level thin layer, and the content of metallocene linear-low density polyethylene is 40-60 part.
3. the packaging film of puncture-resistant according to claim 1, it is characterized in that, according to the mass fraction, the content of low density polyethylene (LDPE) is 10-30 part to the raw material composition of internal layer membrane layer, the content of metallocene linear-low density polyethylene is 40-60 part, and the content of polyolefin elastomer is 20-40 part.
4. the packaging film of puncture-resistant according to claim 1, is characterized in that, in outer membrane layer, the density of described high density polyethylene (HDPE) is 0.951g/cm
3, melt index MI is 1.1g/10min.
5. the packaging film of puncture-resistant according to claim 1, is characterized in that, described in the thin layer of middle level, the density of metallocene linear-low density polyethylene is 0.92g/cm
3, melt index MI is 0.8g/10min; The density of described high density base ethene is 0.951g/cm
3, melt index MI is 1.1g/10min.
6. the packaging film of puncture-resistant according to claim 1, is characterized in that, the density of the metallocene linear-low density polyethylene of internal layer membrane layer is 0.918g/cm
3, melt index MI is 1g/10min; The density of described low density polyethylene is 0.92g/cm
3, melt index MI is 4g/10min; The density of described polyolefin elastomer is 0.870g/cm
3, melt index is 1g/10min.
7., according to the packaging film of the arbitrary described puncture-resistant of claim 1 ~ 6, it is characterized in that, the gross thickness of the packaging film of described puncture-resistant is 60 μm ~ 80 μm, and the thickness of outer membrane layer accounts for the 28-35% of gross thickness; The thickness of internal layer membrane layer accounts for 40% ~ 50% of gross thickness; Surplus is the thickness of middle level thin layer.
8. a preparation method for the packaging film of the puncture-resistant as described in as arbitrary in claim 1 ~ 7, is characterized in that, comprise the following steps:
Screw extruder high density polyethylene (HDPE) being poured into outer membrane layer is mixing; After high density polyethylene (HDPE) and metallocene linear-low density polyethylene fully mix in proportion, the screw extruder pouring middle level thin layer into is mixing; After metallocene linear-low density polyethylene, polyolefin elastomer and low density polyethylene (LDPE) fully being mixed in proportion, the screw extruder pouring internal layer membrane layer into is mixing;
The flow-like three-layer thin-film raw material that present after mixing are transported to three-layer co-extruded extruder film head simultaneously and melt extrude, and mediate in bubble embryo, by the draw of upper traction rotation tractor, film bubble is cooling forming under the effect of cooling vane.
9. the preparation method of the packaging film of puncture-resistant according to claim 8, is characterized in that, the extruder temperature of outer membrane layer screw extruder is 150 ~ 170 DEG C, and its head temperature is 165 ~ 180 DEG C; The extruder temperature of middle level thin layer screw extruder is 155 ~ 165 DEG C, and its head temperature is 165 ~ 185 DEG C DEG C; The extruder temperature of internal layer membrane layer screw extruder is 155 ~ 165 DEG C, and its head temperature is 165 ~ 185 DEG C.
10. the preparation method of the packaging film of puncture-resistant according to claim 8, it is characterized in that, the rotating speed of the screw rod of outer membrane layer screw extruder, middle level thin layer screw extruder and internal layer membrane layer screw extruder is 20 ~ 40r/min, extrudes tonnage and is 25 ~ 35MPa.
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| CN107283979A (en) * | 2016-04-11 | 2017-10-24 | 宜兴威尼特包装袋有限公司 | high temperature resistant composite membrane |
| CN107964151A (en) * | 2017-12-05 | 2018-04-27 | 浙江天玮雨具有限公司 | The formula and technique of a kind of umbrella high transparency POE films |
| CN108001002A (en) * | 2017-11-30 | 2018-05-08 | 上海紫江彩印包装有限公司 | Vacuum insulation panel Obstruct membrane polyolefin film, its preparation method, Obstruct membrane and vacuum insulation panel |
| CN108001004A (en) * | 2017-11-30 | 2018-05-08 | 上海紫江彩印包装有限公司 | Photosensitive material is packed for polyolefin black film, its preparation method and includes its composite membrane |
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| CN113696576A (en) * | 2021-06-16 | 2021-11-26 | 广东骊虹包装有限公司 | Double-screw four-layer co-extrusion PE (polyethylene) single-material packaging film and preparation method thereof |
| 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 |
| CN114103346A (en) * | 2021-10-28 | 2022-03-01 | 山东华致林医药科技有限公司 | Medicinal packaging material and preparation method thereof |
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