CN101533873A - Method for encapsulating pervious crystalline silicon solar cell modules - Google Patents
Method for encapsulating pervious crystalline silicon solar cell modules Download PDFInfo
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- CN101533873A CN101533873A CN200910038699A CN200910038699A CN101533873A CN 101533873 A CN101533873 A CN 101533873A CN 200910038699 A CN200910038699 A CN 200910038699A CN 200910038699 A CN200910038699 A CN 200910038699A CN 101533873 A CN101533873 A CN 101533873A
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- solar cell
- glued membrane
- cell modules
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- laminating machine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a method for encapsulating pervious crystalline silicon solar cell modules, comprising the following steps: upper and lower layers of macromolecular polyester films are arranged at the bottom and top of the solar cell modules featuring five layers of superposed structures, and the margins of the two layers of macromolecular polyester films exceed the margins of the solar cell modules featuring five layers of superposed structures; the preheating temperature of layer presses of the solar cell modules is set at 60-80 DEG C, the five layers of superposed structures are placed in the layer presses, the layer presses are vacuumized until the pressure is lower than 200kPa and the modules are pressurized; the lamination temperature of the layer presses is set at 135-145 DEG C, under which the lamination lasts for 15-25min, after lamination, the layer presses are opened for taking out the molded solar cell modules. The obtained solar cell modules are pervious and beautiful and eliminate bubbles, displacement, solar cell split and glass fragmentation faced by the pervious cell modules in the process of encapsulation.
Description
Technical field
The present invention relates to a kind of method for packing of pervious crystalline silicon solar cell modules, can be used for BIPV.
Background technology
The printing opacity solar module is attractive in appearance, applied range, but packaging technology remains in technical bottleneck, the printing opacity solar module that domestic and international Photovoltaics Com Inc. is released, and aspects such as its production cost, finished product rate and product weather resisteant energy still can not be competed mutually with common component.At present Japan, some companies of Germany adopt glue-pouring methods encapsulation printing opacity solar modules, and this technology is ripe relatively and can produce the bend glass assembly, are not suitable for large-scale production but the technology cost is very high.
Adopt common solar module lamination packaging technology to carry out the encapsulation of printing opacity solar cell, owing to used the glass of rigidity to substitute the back veneer material of the used flexible TPE/TPT of common component as assembly, in the component lamination encapsulation process because the extruding of two-layer nonbreakable glass, be easy to occur bubble, displacement, solar cell sliver, glass fragmentation faced phenomenon, Germany one tame component devices company releases the laminating apparatus that has cooling system for this reason, can solve printing opacity solar module air bubble problem, but this technology lamination cycle is long, and equipment investment is very big.
In recent years photovoltaic industry develop rapidly both at home and abroad, domestic several families solar module encapsulates big factory and also is devoted to printing opacity solar module encapsulation research, and release printing opacity solar module in some exhibitions at home, the part assembly all has a small amount of bubble at the edge, and the price height all also fails to put goods on the market fully.
At present, also there is partial monopoly to propose to adopt the traditional components sealed in unit to carry out the method for pervious crystalline silicon solar cell modules encapsulation, for example application number is in 200710027966.4 the patent " method for packing of double-side silicon-glass solar cell assembly ", a kind of structure that adopts layer glass instead of glass-TPE has been proposed, to realize the effect of battery component printing opacity, lamination is treated in this patent proposition before component lamination battery structure adopts specific macromolecular material to handle, to reduce even to eliminate the phenomenon of generation bubble in the assembly, but do not provide concrete enforcement means, in implementation process, be difficult to get a desired effect.The novelty method for packing of the pervious crystalline silicon solar cell modules that the application's patent proposes, can utilize existing common solar module sealed in unit fully, reach the packaging effect of light-transmitting component preferably, it is simple to have technology, characteristics with short production cycle, that the cost of material is low.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method for packing that adopts the common component laminating machine to carry out pervious crystalline silicon solar cell modules, its technology is simple, and effect is obvious, and cost is relatively low.
Purpose of the present invention is achieved through the following technical solutions:
A kind of method for packing of pervious crystalline silicon solar cell modules may further comprise the steps:
(1) solar cell piece is carried out connection in series-parallel, form solar battery string; Described solar battery string, EVA glued membrane and glass are layering, and form the five stacked solar modules that add structure of glass-EVA glued membrane-solar cell-EVA glued membrane-glass;
(2) two-layer macromolecular polyester films places step (1) five stacked solar module bottom and the top that adds structure up and down, and two-layer macromolecule polyester film edge exceeds the five stacked solar module edges that add structure;
(3) preheat temperature that the solar module laminating machine is set is 60-80 ℃, when reaching this temperature, the five stacked structures that add that have two-layer macromolecular polyester films of step (2) are put into laminating machine, laminating machine is evacuated to is lower than 200kPa, assembly is pressurizeed;
(4) laminating temperature that the solar module laminating machine is set is 130～150 ℃, under this temperature to component lamination 15～25min, the lamination time is opened laminating machine after finishing, and obtaining by up and down two-layer macromolecular polyester films glue envelope is the five stacked solar modules that add structure of a closed cavity.
Glass is preferably low iron toughened glass in the described step (1).
The thickness of EVA glued membrane is preferably 0.25～0.8mm in the described step (1).
The macromolecular polyester films of described step (2) is not melted for maintenance under the laminating temperature in step (4), and is the polyester film of flexible material.Described macromolecular polyester films is PC, PE, PVC, PET or modified ABS film.
Anyhow multiple tracks trace on drawing on the EVA glued membrane of described step (1) prevents the unidirectional contraction of EVA glued membrane.
Owing to take technique scheme, the invention has the beneficial effects as follows:
(1) at producing this situation of bubble in the assembly, the present invention at first improves packaging technology, use up and down two-layer macromolecular polyester films to wrap up to the five stacked solar modules that add structure in the encapsulation process, the EVA glued membrane that two-layer macromolecular polyester films and assembly edge have more is closed cavity with assembly glue envelope in lamination process, after packaged like this double-sided glass sun assembly takes out from laminating machine, air can't enter between the glass, thereby avoid the generation of bubble effectively, this method technology is simple, effective, is suitable for suitability for industrialized production.
(2) adopt the EVA glued membrane of several layers suitable thickness to superpose, the present invention can effectively reduce the bubble that remains between the assembly central authorities solar cell piece.Some tool marks of drawing anyhow on the EVA glued membrane before the stack encapsulation can obviously be avoided the directive contraction of EVA glued membrane, and the battery sheet is subjected to displacement in the control assembly.
(3) EVA does not shrink as yet when the assembly preheating, promptly pressurize to assembly this moment, layer glass is pressed EVA and solar cell piece like this, repeatedly experiment shows, this method Optimization Layer compression technology increases the resistance that the battery sheet is shifted, and has solved the problem of solar cell piece displacement, regulate suitable pressing time and keep solder joint even, avoid battery sheet fragment phenomenon.
(5) the present invention adopts low iron toughened glass to solve the situation that occurs crackle in printing opacity solar module lamination, and the characteristics that this low iron has just been changed glass are: transmitance height, strong shock resistance and long service life.
(6) another characteristics of the present invention are that assembly does not need to carry out other solidification process later at high temperature (140 ℃) lamination, and it has not only reduced equipment investment, and has simplified technical process, helps application.
Description of drawings
Fig. 1 is the structure chart of printing opacity solar module of the present invention;
Embodiment
For the superiority that the present invention compares with common solar module method for packing better is described, 7 embodiment of the present invention that give an example below describe implementation step, but implementation method of the present invention is not limited thereto.
Embodiment 1
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling one deck thickness in monolayer is the EVA glued membrane 2 of 0.25mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, one deck thickness in monolayer that tiles equally successively on solar battery string 1 is EVA glued membrane 2 and the low iron toughened glass 3 of 0.25mm, makes it to form the five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to reduce the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PC the five stacked encapsulated by structures that add then, the edge of PC film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above-mentioned treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed.Under preheat temperature, the EVA film does not shrink as yet, can make layer glass press EVA and solar cell piece after the pressurization, prevents that the battery sheet is subjected to displacement; The laminating temperature that laminating machine is set at last is 140 ℃, is 20min in this temperature laminated time, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module.This moment, the EVA of PC film and high-temperature fusion was bonded together, and handle component glue envelope is the cavity of a sealing, and air can't enter component internal, prevents the generation of bubble.After treating the assembly cooling, cut off assembly PC film and EVA all around with blade and get final product.
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling layer thickness in monolayer is the EVA glued membrane 2 of 0.25mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, stacking two-layer thickness in monolayer on solar battery string 1 equally successively is EVA glued membrane 2 and the low iron toughened glass 3 of 0.25mm, makes it to form the five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to prevent the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PC the five stacked encapsulated by structures that add then, the edge of PC film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed; The laminating temperature that laminating machine is set at last is 145 ℃, in this temperature laminated time is 20min, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module, after treating the assembly cooling, cut off assembly PC film and EVA all around with blade and get final product.
Embodiment 3
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling one deck thickness in monolayer is the EVA glued membrane 2 of 0.25mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, EVA glued membrane 2 and low iron toughened glass 3 that to stack three layers of thickness in monolayer equally successively on solar battery string 1 be 0.25mm make it to form five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to avoid the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PC the five stacked encapsulated by structures that add then, the edge of PC film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed; The laminating temperature that laminating machine is set at last is 150 ℃, in this temperature laminated time is 20min, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module, after treating the assembly cooling, cut off assembly PC film and EVA all around with blade and get final product.
Embodiment 4
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling one deck thickness in monolayer is the EVA glued membrane 2 of 0.6mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, one deck thickness in monolayer that tiles equally successively on solar battery string 1 is EVA glued membrane 2 and the low iron toughened glass 3 of 0.6mm, makes it to form the five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to avoid the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PET the five stacked encapsulated by structures that add then, the edge of PET film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed; The laminating temperature that laminating machine is set at last is 140 ℃, in this temperature laminated time is 20min, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module, after treating the assembly cooling, cut off assembly PET film and EVA all around with blade and get final product.
Embodiment 5
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling one deck thickness in monolayer is the EVA glued membrane 2 of 0.6mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, stacking two-layer thickness in monolayer on solar battery string 1 equally successively is EVA glued membrane 2 and the low iron toughened glass 3 of 0.6mm, makes it to form the five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to avoid the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PET the five stacked encapsulated by structures that add, the edge of PET film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed; The laminating temperature that laminating machine is set at last is 145 ℃, in this temperature laminated time is 20min, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module, after treating the assembly cooling, cut off assembly PET film and EVA all around with blade and get final product.
Embodiment 6
As shown in Figure 1, at first on table top, keep flat a low iron toughened glass 3, tiling one deck thickness in monolayer is the EVA glued membrane 2 of 0.6mm above, the solar battery string 1 that connection in series-parallel is good places above the EVA glued membrane 2, EVA glued membrane 2 and low iron toughened glass 3 that to stack three layers of thickness in monolayer equally successively on solar battery string 1 be 0.6mm make it to form five stacked structures that add of the good low iron toughened glass 3 of solar battery string 1-EVA glued membrane 2-of low iron toughened glass 3-EVA glued membrane 2-connection in series-parallel; Anyhow multiple tracks trace on drawing on the EVA glued membrane 2 is to avoid the unidirectional contraction of EVA glued membrane.Adopt two-layer macromolecular polyester films PET the five stacked encapsulated by structures that add, the edge of PET film need exceed the five stacked edges that add structure; When the laminating machine preheat temperature being set afterwards again being 70 ℃, when the laminating machine temperature of heating plate reaches this temperature, the above treated five stacked structures that add are put into laminating machine, and close the laminating machine loam cake, carry out that the chamber vacuumizes under the laminating machine, go up the chamber inflation simultaneously, the battery that superposes is pressurizeed; The laminating temperature that laminating machine is set at last is 150 ℃, in this temperature laminated time is 20min, after the lamination time finishes, chamber inflation under the laminating machine, last chamber vacuumizes, and makes the cavity of resorption air pressure and the atmospheric pressure balance in discharge pond, opens the laminating machine loam cake and takes out in type solar module, after treating the assembly cooling, cut off assembly PET film and EVA all around with blade and get final product.
In the foregoing description 1, the solar module interposition is equipped with more bubble generation behind the lamination, and solar battery string 1 does not almost have displacement, but has fragment to occur.Among the embodiment 2, through behind the identical technical process lamination, have a small amount of bubble to generate in the middle of the solar module, solar battery string 1 has slight offset phenomena.Among the embodiment 3, solar module does not have bubble and produces, and solar battery string 1 has obvious displacement.Among the embodiment 4, solar module does not have the bubble generation behind the lamination, and solar battery string 1 has slight offset phenomena.Among the embodiment 5, solar module does not have bubble and produces, and solar battery string 1 displacement is obvious.Among the embodiment 6, solar module does not have bubble and produces, and solar battery string 1 displacement is bigger.By embodiment 1～6 as can be seen, produce bubble in the middle of too thin easy generation solar battery string 1 sliver of the thickness of EVA glued membrane 2, the whole solar module, the too thick solar battery string 1 that then easily causes is shifted.In sum, adopting each one deck thickness in monolayer up and down is that the lamination of EVA glued membrane 2 of 0.6mm is good especially.
Claims (6)
1, a kind of method for packing of pervious crystalline silicon solar cell modules is characterized in that may further comprise the steps:
(1) solar cell piece is carried out connection in series-parallel, form solar battery string; Described solar battery string, EVA glued membrane and glass are layering, and form the five stacked solar modules that add structure of glass-EVA glued membrane-solar cell-EVA glued membrane-glass;
(2) two-layer macromolecular polyester films places step (1) described five stacked solar module bottom and the tops that add structure up and down, and two-layer macromolecule polyester film edge exceeds the five stacked solar module edges that add structure;
(3) preheat temperature that the solar module laminating machine is set is 60-80 ℃, when reaching this temperature, the five stacked structures that add that have two-layer macromolecular polyester films of step (2) are put into laminating machine, laminating machine is evacuated to is lower than 200kPa, assembly is pressurizeed;
(4) laminating temperature that the solar module laminating machine is set is 130～150 ℃, under this temperature to component lamination 15～25min, the lamination time is opened laminating machine after finishing, and obtaining by up and down two-layer macromolecular polyester films glue envelope is the five stacked solar modules that add structure of a closed cavity.
2. the method for packing of a kind of pervious crystalline silicon solar cell modules according to claim 1 is characterized in that, glass is low iron toughened glass in the described step (1).
3. the method for packing of a kind of pervious crystalline silicon solar cell modules according to claim 1 is characterized in that, the thickness of EVA glued membrane is 0.25～0.8mm in the described step (1).
4. the method for packing of a kind of pervious crystalline silicon solar cell modules according to claim 1 is characterized in that: the macromolecular polyester films of described step (2) is not melted for maintenance under the laminating temperature in step (4), and is the polyester film of flexible material.
5. the method for packing of a kind of pervious crystalline silicon solar cell modules according to claim 4, it is characterized in that: described macromolecular polyester films is PC, PE, PVC, PET or modified ABS film.
6. the method for packing of a kind of pervious crystalline silicon solar cell modules according to claim 1 is characterized in that: draw multiple tracks trace anyhow on the EVA glued membrane of described step (1), prevent the unidirectional contraction of EVA glued membrane.
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Cited By (10)
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| CN101916788A (en) * | 2010-04-23 | 2010-12-15 | 杭州索乐光电有限公司 | Solar panel and encapsulation process |
| CN101982886A (en) * | 2010-09-13 | 2011-03-02 | 东莞市华源光电科技有限公司 | Production process of PET laminated solar cell plate |
| CN103042806A (en) * | 2011-10-17 | 2013-04-17 | 阿特斯(中国)投资有限公司 | Manufacturing method of double-glass photovoltaic component |
| CN105633183A (en) * | 2016-02-18 | 2016-06-01 | 安徽旭能光伏电力有限公司 | Double-sided glass crystalline silicon solar cell component packaging technology |
| CN107257228A (en) * | 2016-12-11 | 2017-10-17 | 湖北永恒太阳能股份有限公司 | A kind of transparent information type solar cell module |
| CN107731966A (en) * | 2017-11-29 | 2018-02-23 | 华为数字技术（苏州）有限公司 | A kind of method for packing of photovoltaic module |
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| WO2019206275A1 (en) * | 2018-04-28 | 2019-10-31 | 米亚索能光伏科技有限公司 | Solar assembly packaging method and packaging device |
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| CN101916788A (en) * | 2010-04-23 | 2010-12-15 | 杭州索乐光电有限公司 | Solar panel and encapsulation process |
| CN101916788B (en) * | 2010-04-23 | 2012-12-26 | 杭州索乐光电有限公司 | Solar panel and encapsulation process |
| CN101982886A (en) * | 2010-09-13 | 2011-03-02 | 东莞市华源光电科技有限公司 | Production process of PET laminated solar cell plate |
| CN103042806A (en) * | 2011-10-17 | 2013-04-17 | 阿特斯(中国)投资有限公司 | Manufacturing method of double-glass photovoltaic component |
| CN105633183A (en) * | 2016-02-18 | 2016-06-01 | 安徽旭能光伏电力有限公司 | Double-sided glass crystalline silicon solar cell component packaging technology |
| CN107257228A (en) * | 2016-12-11 | 2017-10-17 | 湖北永恒太阳能股份有限公司 | A kind of transparent information type solar cell module |
| CN107731966A (en) * | 2017-11-29 | 2018-02-23 | 华为数字技术（苏州）有限公司 | A kind of method for packing of photovoltaic module |
| CN107731966B (en) * | 2017-11-29 | 2020-03-31 | 华为数字技术（苏州）有限公司 | Packaging method of photovoltaic module |
| WO2019206275A1 (en) * | 2018-04-28 | 2019-10-31 | 米亚索能光伏科技有限公司 | Solar assembly packaging method and packaging device |
| CN108470789A (en) * | 2018-05-17 | 2018-08-31 | 广东汉能薄膜太阳能有限公司 | A kind of packaging method and solar product of solar product |
| CN110491960A (en) * | 2019-07-08 | 2019-11-22 | 上海空间电源研究所 | A kind of method of attaching of solar battery array and its solar battery array is made |
| CN110491960B (en) * | 2019-07-08 | 2021-10-15 | 上海空间电源研究所 | Pasting method of solar cell array and solar cell array manufactured by pasting method |
| CN111162135A (en) * | 2019-12-20 | 2020-05-15 | 中建材浚鑫科技有限公司 | Manufacturing process of glass with frame and double-glass product |
| CN111162135B (en) * | 2019-12-20 | 2023-08-18 | 中建材浚鑫科技有限公司 | Glass manufacturing process for framed double-glass product |
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