CN104085159A - One-way linear easily-torn composite membrane - Google Patents
One-way linear easily-torn composite membrane Download PDFInfo
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- CN104085159A CN104085159A CN201410304900.5A CN201410304900A CN104085159A CN 104085159 A CN104085159 A CN 104085159A CN 201410304900 A CN201410304900 A CN 201410304900A CN 104085159 A CN104085159 A CN 104085159A
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Abstract
The invention discloses a one-way linear easily-torn composite membrane, belonging to the technical field of food packaging material, and aiming at solving the problem that the existing packaging bag composite membrane does not have both easily-torn property and dampness and oxygen barrier performance. The one-way linear easily-torn composite membrane comprises an outer barrier layer and an inner layer, wherein the inner layer is made from polyolefin material, and the outer barrier layer is made from one or more in polyethylene terephthalate (PET), polyamide (PA), polyvinyl acetate (PVA), ethylene vinyl alcohol (EVOH) and polyethylene naphthalate (PEN); an adhesive layer is arranged between the outer barrier layer and the inner layer, and the outer barrier layer is compounded with the inner layer by the adhesive layer; the elongation at break is 50-300% along the easily-torn direction of the inner layer. When the elongation at break of a polyolefin layer is reduced along the easily-torn direction, the easily-torn property is correspondingly improved; when the stripping resistance of the inner layer and the outer barrier layer is improved, the easily-torn property of the composite membrane is also improved. The excellent dampness and oxygen barrier performance of the material is maintained under the premise that the composite membrane is easily torn.
Description
Technical field
The present invention relates to one and easily tear composite membrane, the unidirectional straight line that particularly a kind of internal layer is polyolefine material easily tears composite membrane, belongs to packaging material for food field.
Background technology
Composite package film has excellent steam barrier and oxygen-barrier property, can greatly extend the shelf-life of food, thereby be made into food pack, is widely used in packaging for foodstuff industry.The combined package bag that uses common composite package film to make is all more difficult directly to be opened, generally can be provided with opening to facilitate consumer to open, even but present used a lot of composite packaging membrane materials more difficult tearing still in the situation that being provided with opening, more be difficult to tear along the direction of straight line, caused very large impact to using.
The patent of invention that the application number of announcing as China is 200810196059.7, this patent discloses a kind of manufacture method of easy-tear type polypropylene packaging film, by material is carried out after specific stretch processing can be along easily tearing on draw direction, and tearing notch is comparatively regular.But this technology prepare for monofilm, easily broken and effect of heat insulation is poor, be not easy so again to tear if increase thickness.
Therefore, people replace monofilm to make packaging bag with composite membrane, as the application number patent application that is 99100021.8, disclose a kind of sack of easily tearing and packaging material, this material is a kind of multilayer packaging material with a ground floor and a second layer, and this ground floor comprises two sheets, its edge is pressed close to substantially, and have at least one line of weakness, this line of weakness is by the interface formation of two sheets, and second layer is complete substantially and can tears along it along this line of weakness.This technology can be for the preparation of combined package bag, but due to the existence of line of weakness, the air-tightness to material and mechanical property all can have a certain impact, and line of weakness makes, and packaging bag is easily unexpected to be subject to External Force Acting and to tear.
For this reason, people have carried out the improvement of multiple performance to the material of composite membrane, invent and variously easily torn composite membrane for what make packaging bag, the two-way easily tore film of polyolefin as multi-layer co-extruded in the one of application number: 201220320243.X, comprise improved polyalkene layer, the first polyethylene layer is located at improved polyalkene layer top by the first adhesive layer, and the second polyethylene layer is located at improved polyalkene layer below by the second adhesive layer.The two-way easily tore film of this multi-layer co-extruded polyolefin, by having complementary functions between different plastic layers, reaches the high-intensity easy-to-rupture that simultaneously has, and not only tensile strength is high, dart impact strength is high, cracky not, and has good two-way linear easy-to-rupture.
People find by a large amount of research, causing most of situation that combined package bag is not easy to tear is to cause because prepare the hot sealing layer of complex pocket, when sack is in the time tearing, hot sealing layer in composite packaging rete easily separates with bonding with it layer, and hot sealing layer is also not easy to break, while causing tearing sack, use larger power, consume more energy, directly impression is exactly that sack is not easy to tear.The material that is widely used as composite package film hot sealing layer is TPO material, and the most frequently used is polypropylene, polyethylene etc.Thereby, TPO material is processed, improve simultaneously hot sealing layer and with it the peel strength of bonding layer can comparatively effectively improve the easy-to-rupture of material.
Summary of the invention
The object of the invention is in order to provide one easily to tear composite membrane, the unidirectional straight line that particularly a kind of internal layer is polyolefine material easily tears composite membrane.
The object of the invention is to be achieved through the following technical solutions:
A kind of unidirectional straight line easily tears composite membrane, it is characterized in that, comprises outer barrier layer and internal layer, and described internal layer adopts polyolefine material to make, and described outer barrier layer comprises that one or more materials in PET, PA, PVA, EVOH, PEN make; Between described outer barrier layer and internal layer, be provided with glue-line and be combined with each other by glue-line, the elongation at break that described internal layer easily tears direction is 50%-300%.
Described internal layer, glue-line, outer barrier layer form by dry laminating, and described glue-line is polyurethane glue.
Preferably, easily to tear the elongation at break of direction be 200% to described internal layer.
Further preferred, the elongation at break that described internal layer easily tears direction is 100%.Certainly, consider actual conditions, the elongation at break of internal layer also there is no need very little.The comparatively simple method of controlled fracturing blasting percentage elongation is exactly the stretching of carrying out to a certain degree, and in this patent, the polyolefin film that obtains corresponding elongation at break by drawing process is suitable for.
Preferably, the peeling force 5.5-10N/15cm of described internal layer and outer barrier layer.
The polyolefine material of described internal layer is polyethylene or polypropylene.
Preferably, described internal layer is prepared by polyethylene or polypropylene and is passed through UV crosslinking Treatment.
Preferably, described internal layer thickness is 20-80um.Generally, the thickness of internal layer is more greatly more not easy tear fracture, so its thickness can not be very thick, and for the consideration of cost, also need not be very thick.In the time that internal layer is thinner, the uniformity of its thickness also can variation, and heat-sealing effect also can be subject to impact to a certain extent.Certainly, the gross thickness of composite membrane can differ greatly because of different purposes.
Intellectual material provided by the invention has following usefulness:
1, the composite membrane elongation at break that this patent provides is 50%-300%, easily tears, and is easier to tear along straight line, can greatly facilitate consumer and use.
2, the composite membrane that this patent provides has kept the wet oxygen resistance of the resistance of material excellence under the prerequisite of easily tearing, and is a kind of composite package film of barrier property excellence.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Wherein, 1, internal layer, 2, glue-line, 3, outer barrier layer.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Embodiment 1
The straight line that the present embodiment relates to easily tears composite membrane as shown in Figure 1, be included as successively the internal layer 1 of polyethylene (PE) layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of poly terephthalic acid class plastics (PET) layer, the elongation at break that internal layer 1 easily tears direction is 300%, internal layer 1 is 5.5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, composite membrane gross thickness is 110um, gained composite package film is easily torn at " one " word opening part, and tear line departs from original position ± 1cm.
Embodiment 2
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 5.5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, composite membrane gross thickness is 110um, and gained composite package film is easily torn at " one " word opening part, and tear line departs from original position ± 1cm.
Embodiment 3
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, the elongation at break that internal layer 1 easily tears direction is 100%, internal layer 1 is 5.5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, composite membrane gross thickness is 110um, and gained composite package film is easily torn at " one " word opening part, and tear line departs from original position ± 0.8cm.
Embodiment 4
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 6N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, composite membrane gross thickness is 110um, and gained composite package film is more easily torn compared with embodiment 2 at " one " word opening part, and tear line departs from original position ± 0.8cm.
Embodiment 5
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 10N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 30um, composite membrane gross thickness is 110um, and gained composite package film is more easily torn compared with embodiment 4 at " one " word opening part, and tear line departs from original position ± 0.5cm.
Embodiment 6
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the glue-line 2 of internal layer 1, the polyurethane glue of cast polypropylene (CPP) layer, by POPA layer and VMPET layer by the compound outer barrier layer 3 of polyurethane glue, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 7N/15cm with the peeling force of 3 layers of outer barrier layers, internal layer 1 thickness is 70um, composite membrane gross thickness is 160um, gained composite package film is easily torn at " one " word opening part, and tear line departs from original position ± 1cm.
Embodiment 7
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the glue-line 2 of internal layer 1, the polyurethane glue of PE layer, by VMPET layer and paper by the compound outer barrier layer 3 of polyurethane glue, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 7N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 70um, composite membrane gross thickness is 250um, and gained composite package film is easily torn at " one " word opening part, and tear line departs from original position ± 1cm.
Embodiment 8
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, wherein internal layer 1 is through UV crosslinking Treatment, the elongation at break that untreated front internal layer 1 easily tears direction is 300%, internal layer 1 is 5.5N/15cm with the peeling force of 3 layers of outer barrier layers, internal layer 1 thickness is 80um, composite membrane gross thickness is 110um, gained composite package film is easily torn compared with embodiment 1 at " one " word opening part, and tear line departs from original position ± 1cm.
Embodiment 9
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, the elongation at break that internal layer 1 easily tears direction is 200%, internal layer 1 is 8N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 15um, and the gross thickness of composite membrane is 30um, and gained composite package film is easier to tear at " one " word opening part, tear line departs from original position ± 0.5cm, and oxygen transit dose is 94.2cm
3/ (m
224h0.1MPa), steam penetrating capacity is 4.3g/ (m
224h), oxygen transit dose, the steam penetrating capacity of the composite membrane in the present embodiment and same type comparative example 1 are basically identical.
Embodiment 10
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of cast polypropylene (CPP) layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of BOPA layer, the elongation at break that internal layer 1 easily tears direction is 50%, internal layer 1 is 5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 60um, and composite membrane gross thickness is 90um, and gained composite package film is easily torn at " one " word opening part, tear line departs from original position ± 1cm, and oxygen transit dose is 27.6cm
3/ (m
224h0.1MPa), steam penetrating capacity is 4.1g/ (m
224h), oxygen transit dose, the steam penetrating capacity of the composite membrane in the present embodiment and same type comparative example 2 are basically identical.
Embodiment 11
The straight line that the present embodiment relates to easily tears composite membrane, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of BOPA, the elongation at break that internal layer 1 easily tears direction is 250%, internal layer 1 is 5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, and composite membrane gross thickness is 110um, and gained composite package film is easily torn at " one " word opening part, tear line departs from original position ± 1cm, and oxygen transit dose is 20.1cm
3/ (m
224h0.1MPa), steam penetrating capacity is 2.6g/ (m
224h), oxygen transit dose, the steam penetrating capacity of the composite membrane in the present embodiment and same type comparative example 3 are basically identical.
Comparative example 1
The composite membrane that this comparative example relates to, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of pet layer, it is 500% that internal layer 1 prolongs the elongation at break of tearing direction, internal layer 1 is 8N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 15um, and the gross thickness of composite membrane is 30um, and gained composite package film is torn compared with embodiment 9 difficulties at " one " word opening part, tear line departs from beyond original position ± 1cm, and oxygen transit dose is 96.5cm
3/ (m
224h0.1MPa), steam penetrating capacity is 4.1g/ (m
224h).
Comparative example 2
The composite membrane that this comparative example relates to, be included as successively the internal layer 1 of cast polypropylene (CPP) layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of BOPA layer, the elongation at break that internal layer 1 easily tears direction is 500%, internal layer 1 is 5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 60um, and composite membrane gross thickness is 90um, and gained composite package film is torn compared with embodiment 10 difficulties at " one " word opening part, tear line departs from beyond original position ± 1cm, and oxygen transit dose is 26.5cm
3/ (m
224h0.1MPa), steam penetrating capacity is 4.2g/ (m
224h).
Comparative example 3
The composite membrane that this comparative example relates to, be included as successively the internal layer 1 of PE layer, the glue-line 2 of polyurethane glue, the outer barrier layer 3 of BOPA, the elongation at break that internal layer 1 easily tears direction is 400%, internal layer 1 is 5N/15cm with the peeling force of outer barrier layer 3, internal layer 1 thickness is 80um, and composite membrane gross thickness is 110um, and gained composite package film is torn compared with embodiment 11 difficulties at " one " word opening part, tear line departs from beyond original position ± 1cm, and oxygen transit dose is 20.2cm
3/ (m
224h0.1MPa), steam penetrating capacity is 2.6g/ (m
224h).
Claims (8)
1. unidirectional straight line easily tears a composite membrane, it is characterized in that, comprises outer barrier layer and internal layer, and described internal layer adopts polyolefine material to make, and described outer barrier layer comprises that one or more materials in PET, PA, PVA, EVOH, PEN make; Between described outer barrier layer and internal layer, be provided with glue-line and be combined with each other by glue-line, the elongation at break that described internal layer easily tears direction is 50%-300%.
2. unidirectional straight line according to claim 1 easily tears composite membrane, it is characterized in that, described internal layer, glue-line, outer barrier layer form by dry laminating, and described glue-line is polyurethane glue.
3. unidirectional straight line according to claim 2 easily tears composite membrane, it is characterized in that, the elongation at break that described internal layer easily tears direction is 200%.
4. unidirectional straight line according to claim 2 easily tears composite membrane, it is characterized in that, the elongation at break that described internal layer easily tears direction is 100%.
5. easily tear composite membrane according to the unidirectional straight line described in claim 1 or 2 or 3 or 4, it is characterized in that, the peeling force 5.5-10N/15cm of described internal layer and outer barrier layer.
6. unidirectional straight line according to claim 5 easily tears composite membrane, it is characterized in that, the polyolefine material of described internal layer is polyethylene or polypropylene.
7. unidirectional straight line according to claim 6 easily tears composite membrane, it is characterized in that, described internal layer is prepared by polyethylene or polypropylene and passed through UV crosslinking Treatment.
8. unidirectional straight line according to claim 7 easily tears composite membrane, it is characterized in that, described internal layer thickness is 20-80um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410304900.5A CN104085159A (en) | 2014-06-30 | 2014-06-30 | One-way linear easily-torn composite membrane |
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| CN201410304900.5A CN104085159A (en) | 2014-06-30 | 2014-06-30 | One-way linear easily-torn composite membrane |
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| CN104960764A (en) * | 2015-04-30 | 2015-10-07 | 广东金榜塑料包装有限公司 | PET transparent sheet and composite PE film modified atmosphere packaging material used for food packaging and manufacturing method thereof |
| CN105857867A (en) * | 2016-05-03 | 2016-08-17 | 贵州瑞龙集团塑料包装有限公司 | Nano-composite film bag capable of realizing one-way venting and high obstruction |
| CN108688272A (en) * | 2018-07-26 | 2018-10-23 | 刘建林 | Packaging bag film and its manufacturing method and packaging bag |
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Cited By (5)
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Application publication date: 20141008 |