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Hermetic sealing. Sealing up of end faces

Cellular (cellular) polycarbonate (CPC)

Geometrical orientation of panels
Hermetic sealing. Sealing up of end faces.
Connection and fastening of panels
The Account of temperature expansions
Machining and pasting

Hermetic sealing. Sealing up of end faces.

Cellular polycarbonate - good stuff, but it has one negative feature - hygroscopicity and in general high permeability for gases and vapours. Surprisingly, but polycarbonate, for example, is the best some other polymers passes and accumulates a moisture. It imposes a number of technological restrictions on use of a material. In particular, for this reason cellular polycarbonate demands packing end faces longitudinal "honeycomb" an aluminium tape.Property of hygroscopicity can negatively affect, for example, vinylic application. If light boxes it is insufficiently tight, the moisture which has got inside of it, it can be absorbed from a underside of a leaf of polycarbonate (as a rule, the external surface is tightened by a vinylic film and not hydroscopic). Then, after a while, at change of humidity and-or the temperatures, the saved up moisture can back act on both surfaces, including on external - that is under a film.If application - only the letters pasted by one layer, and concerning a thin vinylic film (50-80 microns) accidents will not be as thin PVC also is capable to pass pairs (on this property it is based so-called "mokbbred" a method of installation). But if on a surface multilayered application or are applied thick (100-200 microns) a film, or (that is even worse!) metallized or a polyester film (it more often mirror metallics) result can become bubbling to application - at the best, and full tearing away of a film or blackening the metallized layer - in the worst. Thus neither the film, nor polycarbonate will not be guilty are only a vivid example of wrong technology of use of materials.And the way of opposition of a problem idle time - should be protected well more or less only internal space boxes from penetration of an atmospheric moisture (a rain and a snow). The tube of inexpensive hermetic costs much less than possible problems from nerves of the customer because of bubbling and layer separation images. By the way, even if to do nothing, bubbles by itself will disappear (a moisture the another matter will leave), that the problem in the further will repeat again and again.Other, more effective way - a covering of a surface where the application will be put, special structures with barrier properties, for example a varnish. Protection of the return (non-working) party of a leaf helps, also. It too can be varnished, or to roll up transparent or white a translucent film the leaf Stuck from both parties will "not breathe" any more a moisture.So, one of prominent aspects at installation of panels of polycarbonate is sealing up of end faces of a leaf, especially end faces with the open channels as later, if to not undertake the protective measures, to one of the basic problems at operation can become penetration of a moisture and a dust inside of channels, formation of a condensate inside of section spaces, to remove which in already collected design it will be hard, that can cause not only local turbidity of a material, but also eventually cause greening and final damage of a cellular leaf (in case condensate was already formed, it is possible to remove, blowing emptiness the compressed cold air). To avoid similar problems completely not difficultly - it is necessary to use always at sealing up of end faces of a leaf special aluminium tapes together with face polycarbonate or aluminium structures. And now about all this is more detailed.

The Aluminium self-glued tape

The Aluminium tape - the necessary assembly element intended for sticking up of end faces of panels.There are two types of tapes:

Deaf aluminium tapes.

Are applied for packing the top, raised party of a slope a polycarbonate roof (at vertical and sloped an arrangement), to protection against deposits, providing with that reliable hermetic sealing of panels and preventing hit of a dust inside of it.If the leaf of cellular polycarbonate is established vertically (for example, in light boxes), and it honeycombs are focused too vertically then the given continuous tape should completely pressurise the top end face of the panel.Purpose of a tape - to exclude hit inside honeycombs a direct atmospheric moisture - a rain, snows, an ice.For end of operation on hermetic sealing on the top end face of the panel closed by an aluminium tape put on special face polycarbonate or the aluminium structure, corresponding thickness and color of the used panel. Operation on closing end faces borrows few minutes, and quality of a material is kept constant long years.

Depending on thickness of polycarbonate tapes of next width are applied:

For panels of 4-6 mm - width 12mm.
For panels of 8-10 mm - width 25mm.
For panels of 16-25 mm - width 38mm.
For panels of 32-40 mm - width 50mm.

Length of a roll, as a rule, 50 m.

The punched aluminium tapes.

The Punched tape with the microfilter is developed specially for protection and hermetic sealing longitudinal honeycombs cellular polycarbonate from a moisture and a dust.It is an inexpensive and durable self-glued tape with micropunching it is capable to follow temperature fluctuations polycarbonate panels in a wide range of temperatures, to create inside honeycombs the necessary microclimate and simultaneously to resist to friction edging a structure at its installation. The tape serves not less than 10 years in severe constraints of operation: UV-radiation, humidity, high and low temperatures, a molded fungus. The tape has silvery color and represents the punched self-glued basis on a substrate. Force of adhesion of a glutinous layer is high enough, but is balanced in such a manner that allows to correct in case of need a tape and to paste it repeatedly, and also to resist to the effort of shift arising because of a difference of factors of temperature expansion of sheets and structures.Tapes with punching are applied to protection of the bottom side of a leaf polycarbonate roof. The air filter of the punched tapes, with the size of times 40 micron, interferes with penetration of insects, a dust and a dirt in honeycombs, but at the same time carries out drainage functions, passing accumulated in honeycombs a condensate outside and providing moist circulation.For correct end of operation on hermetic sealing on the bottom end face of the panel of polycarbonate closed by a punched tape put on special face polycarbonate or the aluminium structure corresponding thickness and color of the used panel - as a result is provided technically reliable use of the panel with preservation of its high transparency.

Depending on thickness of polycarbonate the punched tapes of next width are applied:

For panels of 4-6 mm - width 12mm.
For panels of 8-10 mm - width 25mm.
For panels of 16-25 mm - width 38mm.
For panels of 32-40 mm - width 50mm.

Length of a roll - 33m. or 50m.

Silicone hermetic

It is used for hermetic sealing panels in places of their connection with a structure and at fastening edges of a leaf to keep a leaf on the place put to it, and also for maintenance of water resistance of sealing up.It is necessary to consider that fact that all is far not the hermetics offered in the market, approach for polycarbonate sheets, and use of the some people can lead to fast and essential damage of sheets. The blanket is broken, sheets "grow turbid" and darken, and also become more fragile. So, for example, silicane hermetics on the basis of amines or benzamide with polycarbonate are incompatible and can cause its destruction.

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