CN205238741U - Barrier film and vacuum insulation panel - Google Patents
Barrier film and vacuum insulation panel Download PDFInfo
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- CN205238741U CN205238741U CN201520954506.6U CN201520954506U CN205238741U CN 205238741 U CN205238741 U CN 205238741U CN 201520954506 U CN201520954506 U CN 201520954506U CN 205238741 U CN205238741 U CN 205238741U
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Abstract
The utility model relates to a packaging film technical field especially relates to a barrier film and vacuum insulation panel. The utility model provides a barrier film, including nylon layer who is located the outside and the compound polyethylene layer that is located the inboard, still be equipped with between nylon layer and compound polyethylene layer and gather naphthalenedicarboxylic acid glycol ester layer and ethylene - ethonal copolymer layer. PEN's gaseous separation nature better is about 5 times of VMPET to it has good heat resistance and chemical resistance, even the performance also can remain stable in high temperature environment, makes this barrier film's of adoption vacuum insulation panel's application scope wider, simultaneously EVOH has and good hinders the performance that the gas barrier body and vapor saw through, and resistant oil corrosion, keeps perfumed characteristic, and it compares with the aluminium foil that coefficient of heat conductivity is lower, the heat conductivility is poorer, because its heat conductivility is poor, vacuum insulation panel's heat -proof quality is just good more, multiplicable vacuum insulation panel's life.
Description
Technical field
The utility model relates to packing film technical field, relates in particular to a kind of vacuum insulation panel packaging Obstruct membrane and vacuum insulation panel.
Background technology
Vacuum insulation panel (VacuumInsulationPanel, VIP plate) be a kind of superadiabatic insulation material, be widely used in the fields such as refrigerator, freezer and building, it is composited by stuffed heat insulated core, getter and Obstruct membrane, it adopts the method vacuumizing that the gas clean-up being retained in adiabatic space is fallen, the heat transmission of effectively avoiding cross-ventilation to cause, has greatly reduced thermal conductivity factor. And Obstruct membrane plays effects such as intercepting gas and moisture, therefore the performance of vacuum heat-insulating plate and service life, depend on to a great extent surperficial diaphragm material impermeabilisation ability to gas in its use procedure, vacuum in vacuum heat-insulating plate is lower, its heat-proof quality is better, thermal conductivity factor changes little, and the heat-proof quality of vacuum heat-insulating plate is better, and service life is longer. The Obstruct membrane of existing vacuum insulation panel uses aluminium foil and vacuum plated aluminum film (VMPET) to intercept moisture and air mostly, although can realize the function that intercepts moisture and air, but the heat endurance of vacuum aluminium foil is poor, unstable properties in hot environment, has limited the scope of application of vacuum insulation panel; And, although aluminium foil has the ability of good component gas and moisture, because the thermal conductivity factor of aluminium foil itself is high, be easy to conduct heat, cause the thermal conductivity factor of Obstruct membrane to rise, affect the heat-proof quality of vacuum insulation panel, reduce the service life of thermal insulation board.
In addition, because the barrier of vacuum insulation panel is had relatively high expectations, Obstruct membrane itself is thicker, producting process difficulty is larger, and material is selected bad, surface smoothness easily occurs not high, the phenomenons such as fold, had both affected the outward appearance of vacuum insulation panel, also affected the effect of heat insulation of vacuum insulation panel simultaneously.
Utility model content
(1) technical problem that will solve
The technical problems to be solved in the utility model is: traditional vacuum insulation panel Obstruct membrane, it adopts aluminium foil and vacuum plated aluminum film to intercept gas and moisture, because the thermal conductivity factor of aluminium foil itself is high, be easy to conduct heat, cause the thermal conductivity factor of Obstruct membrane to rise, affect the heat-proof quality of vacuum insulation panel, reduce the service life of thermal insulation board; And the poor heat stability of vacuum aluminium foil, the unstable properties in hot environment, has limited the scope of application of vacuum insulation panel.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides a kind of vacuum insulation panel packaging Obstruct membrane, it is characterized in that: comprise the composite polyethylene layer that is positioned at the nylon layer in outside and is positioned at inner side, between nylon layer and composite polyethylene layer, be also provided with PEN layer and evoh layer.
Preferably, described PEN layer is between nylon layer and evoh layer.
Preferably, described evoh layer is between nylon layer and PEN layer.
Preferably, described vacuum insulation panel packaging all bonds by compound adhesive between four-level membrane from outside to inside with Obstruct membrane, and the Thickness Ratio between three layers of composite layer is 2.0-3.0:3.2-3.5:3.6-4.0 from outside to inside.
Preferably, described compound adhesive is two-component polyurethane adhesive.
Preferably, the thickness of described nylon layer is that the thickness of 10-20 μ m, described PEN layer is that the thickness of 5-8 μ m, described evoh layer is that the thickness of 10-15 μ m, described composite polyethylene layer is 40-60 μ m.
Some head, the thickness of described nylon layer is that the thickness of 13 μ m, described PEN layer is that the thickness of 7 μ m, described evoh layer is that the thickness of 11 μ m, described composite polyethylene layer is 45 μ m.
Preferably, the limit deviation of the thickness uniformity of described composite polyethylene layer is 2%-3%.
The utility model also provides a kind of vacuum insulation panel, comprises the Obstruct membrane described in the above-mentioned any one of insulated core material, getter and claim.
(3) beneficial effect
Technique scheme tool of the present utility model has the following advantages: the utility model provides a kind of vacuum insulation panel packaging Obstruct membrane, comprise the composite polyethylene layer that is positioned at the nylon layer in outside and is positioned at inner side, between nylon layer and composite polyethylene layer, be also provided with PEN layer and evoh layer. The Obstruct membrane that the utility model provides arranges PEN layer (PEN) and evoh layer (EVOH) between nylon layer and composite polyethylene layer, the barrier properties for gases of PEN layer is better about 5 times of VMPET, and it has good heat resistance and chemical resistance, even if also can keep stable at hot environment performance, make the scope of application of the vacuum insulation panel that adopts this Obstruct membrane wider; Simultaneously EVOH has the performance that good obstruct gas and steam see through, and oil resistant burn into keeps the characteristic of fragrance, and thermal conductivity factor is lower compared with aluminium foil or other materials, heat conductivility is poorer for it, because its heat conductivility is poor, the heat-proof quality of vacuum insulation panel is just better, can increase the service life of vacuum insulation panel.
Brief description of the drawings
The utility model advantage accompanying drawing below combination above-mentioned and/or additional aspect is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is the structural representation of the vacuum insulation panel packaging Obstruct membrane described in the utility model embodiment mono-;
Fig. 2 is the structural representation of the vacuum insulation panel packaging Obstruct membrane described in the utility model embodiment bis-.
Wherein in Fig. 1 and Fig. 2, the corresponding relation between Reference numeral and component names is:
1, nylon layer, 2, PEN layer, 3, evoh layer, 4, composite polyethylene layer, 5, composite layer.
Detailed description of the invention
In description of the present utility model, it should be noted that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " " interior ", orientation or the position relationship of instructions such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model. in addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals. For the ordinary skill in the art, can concrete condition understand the concrete meaning of above-mentioned term in the utility model. In addition,, in description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more.
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiment. Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
As depicted in figs. 1 and 2, the utility model provides a kind of vacuum insulation panel packaging Obstruct membrane, comprise the nylon layer 1 that is positioned at outside and the composite polyethylene layer 4 that is positioned at inner side, between nylon layer 1 and composite polyethylene layer 4, be also provided with PEN layer 2 and evoh layer 3. The Obstruct membrane that the utility model provides arranges PEN layer 2 (PEN) and evoh layer 3 (EVOH) between nylon layer 1 and composite polyethylene layer 4, the barrier properties for gases of PEN layer is better about 5 times of VMPET, and it has good heat resistance and chemical resistance, even if also can keep stable at hot environment performance, make the scope of application of the vacuum insulation panel that adopts this Obstruct membrane wider; Simultaneously EVOH has the performance that good obstruct gas and steam see through, and oil resistant burn into keeps the characteristic of fragrance, and its with aluminium foil or lower compared with thermal conductivity factor, heat conductivility is poorer, because its heat conductivility is poor, the heat-proof quality of vacuum insulation panel is just better, can increase the service life of vacuum insulation panel.
Embodiment mono-
As shown in Figure 1, the utility model provides a kind of vacuum insulation panel packaging Obstruct membrane, it is followed successively by nylon layer 1, PEN layer 2 and evoh layer 3 composite polyethylene layers 4 from outside to inside for four-layer structure, between above-mentioned four-layer structure, is all bonded together by compound adhesive; Its ectomesoderm adopts nylon (NY) layer; nylon is that polyamide has stronger toughness, tensile strength, percentage elongation and wearability; its physical and mechanical properties is good; can increase withstand voltage, shock-resistant, anti-puncture and the resistance to performance such as fall of product after compound; can well protect content; ensure the adaptability of product, and its cost is lower, cost performance is higher. And the application's Obstruct membrane uses the traditional VMPET (vacuum plated aluminum film) of the combination replacement of PEN and EVOH and the combination of aluminium foil, steam and gas are played to iris action, wherein PEN is better for the barrier of air, be about 5 times of VMPET, and it has good heat resistance and chemical resistance, even if also can keep stable at hot environment performance, make the scope of application of the vacuum insulation panel that adopts this Obstruct membrane wider; Simultaneously EVOH has the performance that good obstruct gas and steam see through, and oil resistant burn into keeps the characteristic of fragrance, and its with aluminium foil or lower compared with thermal conductivity factor, heat conductivility is poorer, because its heat conductivility is poor, the heat-proof quality of vacuum insulation panel is just better, can increase the service life of vacuum insulation panel. The combination of PEN and EVOH can meet the function that intercepts steam and air in addition, can ensure Obstruct membrane can intercept better steam and air, increase its heat-proof quality, when improving its service life, can also reduce the thermal conductivity factor of thermal conductivity heat-insulating film, increase the heat-proof quality of vacuum insulation panel, can also ensure that Obstruct membrane performance is enough under higher temperature stability has increased the scope of application of vacuum insulation panel simultaneously. Composite polyethylene layer 4 fusing point are lower, can be used as sealant.
Internal layer composite polyethylene of the present utility model can be to be followed successively by from outside to inside compound skin, sandwich layer, heat-sealing internal layer, trilaminate material is composited, described compound skin is high strength and chemical stability metallocene PE, medium density polyethylene, low density polyethylene (LDPE) blending extrusion, its weight ratio is 1: 1-1.4: 0.3-0.45, is preferably 1:1.4:0.45; By selection and the proportioning of three pairs of layer materials, make it have good hot sticky performance and ageing-resistant performance, vacuumizing under state, keep fabulous bonding strength, ensure not reveal, indeformable. When packaging vacuum heat insulation material, can use for a long time, heat-resisting, there is not layering; There is good physical and mechanical properties, can promote the deflection of packaging; There is stable coefficient of friction control, ensure the normal operation of high-speed packaging.
Wherein compound skin: choose the moderate medium density polyethylene of density, its even molecular weight distribution, there is good physical mechanical strength. Add a certain proportion of high strength and chemical stability metallocene PE, can improve the composite effect of this layer and time internal layer. Add a small amount of low density polyethylene (LDPE) simultaneously, can further optimize the processing characteristics of film. So, both ensure the good processing characteristics of equipment, ensured again physical and mechanical properties, combined strength bination and the moderate barrier property of film. Sandwich layer: selected high density polyethylene (HDPE), due to longitudinal tear poor-performing in high density polyethylene (HDPE) physical and mechanical properties, fragility is large, therefore after adding high strength and chemical stability metallocene PE, improve its machine direction tear, can ensure again good equipment processing characteristics and barrier property simultaneously. Heat-sealing internal layer: selected heat-sealing window wider, the low-temperature heat-sealing metallocene PE that heat sealability is strong, empty envelope or false envelope phenomenon can not occur in the time of heat-sealing, have ensured the air-tightness of material under vacuum condition. Because low-temperature heat-sealing metallocene PE density is lower, viscosity is larger, and processing characteristics is bad, is therefore added into part low density polyethylene (LDPE) to improve the processing characteristics of film.
Certainly; composite polyethylene layer 4 is not only confined to said structure and said ratio mode, also can, for the polyethylene of other kinds carries out proportioning, can realize equally the application's object; its aim does not depart from design philosophy of the present utility model, should belong to protection domain of the present utility model.
Preferably, the limit deviation of the thickness uniformity of described composite polyethylene layer 4 is 2%-3%, and above-mentioned deviation can definitely be protected sealing heat seal strength uniformity, without empty seal point, further improves the closely sealed performance of sealing; Its flat appearance, the barrier high-peeling strength of corrugationless packaging bag is good; Temperature tolerance and ageing-resistant effective.
Preferably, described vacuum insulation panel packaging all boning by compound adhesive between four-level membrane from outside to inside with Obstruct membrane, Thickness Ratio between three layers of composite layer is 2.0-3.0:3.2-3.5:3.6-4.0 from outside to inside, described compound adhesive is two-component polyurethane adhesive, certainly, also can adopt the glue of other kinds, as long as can be by nylon layer 1, PEN layer 2 and evoh layer 3 and composite polyethylene layer 4 are bonded together, just can realize the application's object, its aim does not depart from design philosophy of the present utility model, should belong to protection domain of the present utility model, preferably, the thickness of described nylon layer 1 is that the thickness of 10-20 μ m, described PEN layer 2 is that the thickness of 5-8 μ m, described evoh layer 3 is that the thickness of 10-15 μ m, described composite polyethylene layer 4 is 40-60 μ m. alternatively, the thickness of described nylon layer 1 is 13 μ m or 14 μ m, and the thickness of described PEN layer 2 is that the thickness of 7 μ m, 8 μ m or 5 μ m, described evoh layer 3 is that the thickness of 11,12 or 15 μ m, described composite polyethylene layer 4 is 45 or 55 μ m, because the performance of the obstruct air of PEN is stronger, what therefore PEN layer can be arranged is thinner, can meet too the object that intercepts air, and the thickness of whole like this Obstruct membrane just can be thinner, outward appearance that can improving product, the increase market competitiveness.
The thickness that above-mentioned Obstruct membrane is each layer can either meet requirement to Obstruct membrane physical and mechanical properties, also can meet for the requirement that intercepts steam and air, also can ensure the heat endurance of barrier film simultaneously, keep less pyroconductivity, and reduce as much as possible the thickness of Obstruct membrane, with the outward appearance of improving product, increase the practicality of vacuum insulation panel.
The Obstruct membrane that the utility model provides and the Data Comparison of existing Obstruct membrane be as in the table below:
Have Obstruct membrane that above table can find out that the application provides compared with existing Obstruct membrane its moisture-vapor transmission and oxygen percent of pass lower, its peak intensity is better simultaneously, can make the heat-proof quality of vacuum insulation panel better, and then improve the service life of vacuum insulation panel.
The utility model also provides a kind of vacuum insulation panel, comprises the Obstruct membrane described in insulated core material, getter and above-described embodiment; The vacuum insulation panel that the utility model provides, owing to being provided with PEN layer 2 and evoh layer 3 in its Obstruct membrane; Can also improve heat endurance meeting in intercepting steam and air, can ensure that Obstruct membrane performance is enough under higher temperature stability has increased the scope of application of vacuum insulation panel; When the combination of PEN and EVOH can meet the function that intercepts steam and air in addition, can also reduce the thermal conductivity factor of thermal conductivity heat-insulating film, increase the heat-proof quality of vacuum insulation panel, improve its service life.
The utility model provides again the method for a kind of manufacture Obstruct membrane as described in above-described embodiment one, comprises the steps
S1 smears compound adhesive by nylon layer 1 on dry coating machine, then adopts organic solvent to dilute, and dries rear and PEN layer 2 pressurized adhesion, rolling;
S2, smears compound adhesive on the PEN face of the composite membrane winding in S1, then adopts organic solvent to dilute, after drying with ethylene-vinyl alcohol copolymer or PEN pressurized adhesion, rolling;
S3, smears compound adhesive by the ethylene-vinyl alcohol copolymer face of the composite membrane winding in S2, then adopts organic solvent to dilute, after drying with composite polyethylene layer 4 pressurized adhesion, rolling.
Embodiment bis-
The main distinction of the present embodiment and embodiment mono-is, in the present embodiment, evoh layer 3 is between nylon layer 1 and PEN layer 2; As shown in Figure 2, the vacuum insulation panel packaging Obstruct membrane that the present embodiment provides, it is followed successively by nylon layer 1, evoh layer 3, PEN layer 2 and composite polyethylene layer 4 from outside to inside for four-layer structure, between above-mentioned four-layer structure, is all bonded together by compound adhesive; Its ectomesoderm adopts nylon (NY) layer; nylon is that polyamide has stronger toughness, tensile strength, percentage elongation and wearability; its physical and mechanical properties is good; can increase withstand voltage, shock-resistant, anti-puncture and the resistance to performance such as fall of product after compound; can well protect content; ensure the adaptability of product, and its cost is lower, cost performance is higher. And the application's Obstruct membrane uses the traditional VMPET (vacuum plated aluminum film) of the combination replacement of PEN and EVOH and the combination of aluminium foil, steam and gas are played to iris action, wherein PEN is better for the barrier of air, be about 5 times of VMPET, and it has good heat resistance and chemical resistance, even if also can keep stable at hot environment performance, make the scope of application of the vacuum insulation panel that adopts this Obstruct membrane wider; Simultaneously EVOH has the performance that good obstruct gas and steam see through, and oil resistant burn into keeps the characteristic of fragrance, and its with aluminium foil or lower compared with thermal conductivity factor, heat conductivility is poorer, because its heat conductivility is poor, the heat-proof quality of vacuum insulation panel is just better, can increase the service life of vacuum insulation panel. The combination of PEN and EVOH can meet the function that intercepts steam and air in addition, can ensure Obstruct membrane can intercept better steam and air, increase its heat-proof quality, when improving its service life, can also reduce the thermal conductivity factor of thermal conductivity heat-insulating film, increase the heat-proof quality of vacuum insulation panel, can also ensure that Obstruct membrane performance is enough under higher temperature stability has increased the scope of application of vacuum insulation panel simultaneously. Composite polyethylene layer 4 fusing point are lower, can be used as sealant.
The utility model also provides a kind of vacuum insulation panel, comprises the Obstruct membrane described in insulated core material, getter and above-described embodiment; The vacuum insulation panel that the utility model provides, owing to being provided with PEN layer 2 and evoh layer 3 in its Obstruct membrane; Can also improve heat endurance meeting in intercepting steam and air, can ensure that Obstruct membrane performance is enough under higher temperature stability has increased the scope of application of vacuum insulation panel; When the combination of PEN and EVOH can meet the function that intercepts steam and air in addition, can also reduce the thermal conductivity factor of thermal conductivity heat-insulating film, increase the heat-proof quality of vacuum insulation panel, improve its service life.
The utility model provides again the method for a kind of manufacture Obstruct membrane as described in above-described embodiment two, comprises the steps
S1 smears compound adhesive by nylon layer 1 on dry coating machine, then adopts organic solvent to dilute, and dries rear and evoh layer 3 pressurized adhesion, rolling;
S2, smears compound adhesive on the PEN face of the composite membrane winding in S1, then adopts organic solvent to dilute, after drying with PEN pressurized adhesion, rolling;
S3, smears compound adhesive by the ethylene-vinyl alcohol copolymer face of the composite membrane winding in S2, then adopts organic solvent to dilute, after drying with composite polyethylene layer 4 pressurized adhesion, rolling.
Other technical characterictic in the present embodiment is do not repeat them here identical with embodiment mono-all.
In sum, the utility model provides a kind of vacuum insulation panel packaging Obstruct membrane, comprise the composite polyethylene layer that is positioned at the nylon layer in outside and is positioned at inner side, between nylon layer and composite polyethylene layer, be also provided with PEN layer and evoh layer. The Obstruct membrane that the utility model provides arranges PEN layer (PEN) and evoh layer (EVOH) between nylon layer and composite polyethylene layer, the barrier properties for gases of PEN layer is better about 5 times of VMPET, and it has good heat resistance and chemical resistance, even if also can keep stable at hot environment performance, make the scope of application of the vacuum insulation panel that adopts this Obstruct membrane wider; Simultaneously EVOH has the performance that good obstruct gas and steam see through, and oil resistant burn into keeps the characteristic of fragrance, and its with aluminium foil or lower compared with thermal conductivity factor, heat conductivility is poorer, because its heat conductivility is poor, the heat-proof quality of vacuum insulation panel is just better, can increase the service life of vacuum insulation panel.
Finally it should be noted that: above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment technical scheme of the utility model.
Claims (9)
1. a vacuum insulation panel packaging Obstruct membrane, is characterized in that: comprise outside being positioned atNylon layer and the composite polyethylene layer that is positioned at inner side are gone back between nylon layer and composite polyethylene layerBe provided with PEN layer and evoh layer.
2. vacuum insulation panel packaging Obstruct membrane according to claim 1, is characterized in that:Described PEN layer is between nylon layer and evoh layer.
3. vacuum insulation panel packaging Obstruct membrane according to claim 1, is characterized in that:Described evoh layer is between nylon layer and PEN layer.
4. according to the vacuum insulation panel packaging Obstruct membrane described in claim 1-3 any one, itsBe characterised in that: described vacuum insulation panel packaging the equal between four-level membrane from outside to inside of Obstruct membraneBond by compound adhesive, the Thickness Ratio between three layers of composite layer is 2.0-3.0 from outside to inside:3.2-3.5：3.6-4.0。
5. vacuum insulation panel packaging Obstruct membrane according to claim 4, is characterized in that:Described compound adhesive is two-component polyurethane adhesive.
6. vacuum insulation panel packaging Obstruct membrane according to claim 1, is characterized in that:The thickness of described nylon layer is that the thickness of 10-20 μ m, described PEN layer isThe thickness of 5-8 μ m, described evoh layer is 10-15 μ m, described compound poly-secondThe thickness of alkene layer is 40-60 μ m.
7. vacuum insulation panel packaging Obstruct membrane according to claim 6, is characterized in that:The thickness of described nylon layer is that the thickness of 13 μ m, described PEN layer is 7The thickness of μ m, described evoh layer is 11 μ m, described composite polyethylene layerThickness be 45 μ m.
8. vacuum insulation panel packaging Obstruct membrane according to claim 1, is characterized in that:The limit deviation of the thickness uniformity of described composite polyethylene layer is 2%-3%.
9. a vacuum insulation panel, is characterized in that: comprise insulated core material, getter and rightObstruct membrane described in requirement 1-8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520954506.6U CN205238741U (en) | 2015-11-24 | 2015-11-24 | Barrier film and vacuum insulation panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520954506.6U CN205238741U (en) | 2015-11-24 | 2015-11-24 | Barrier film and vacuum insulation panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205238741U true CN205238741U (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520954506.6U Expired - Fee Related CN205238741U (en) | 2015-11-24 | 2015-11-24 | Barrier film and vacuum insulation panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205238741U (en) |
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2015
- 2015-11-24 CN CN201520954506.6U patent/CN205238741U/en not_active Expired - Fee Related
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