To slow down drying. As a resistant barrier on the suction table which also allows air and vapor to flow through. The basic sandwich set-up for humidification of objects using Gore-Tex: Plastic cover sheet or mylar -Damp blotter -Gore-sex smooth side against object -Object -Gore-Tex smooth side against object Damp blotter Gore-Tex smooth side against object Object Gore-Tex smooth side against object Damp blotter Throughout this paper, unless otherwise noted, I will be referring to Gore-Tex used in this way.
Care should be taken when handling the Gore-Tex material. It is an expensive and delicate fabric that can be easily creased or punctured. Do not use excess weight, like glass or weights on top.
Too much pressure will force water through the membrane. Liquid water can also penetrate at cracks and holes. If the artifact must be held in plane, only use as much weight on top a. To humidify an object use damp or humid blotters, or lightly spray the felt side of the Gore-Tex. Be sure to check your object often, at least every fifteen minutes. Although Gore-Tex usually humidifies slowly, some objects tend to get damp quickly. If after an hour or two you feel you need more moisture to get the desired humidification results, spray the blotters again.
Saturated blotters are excessive. Once one becomes familiar with the way Gore-Tex works, the different components can be changed. Or, create a small vapor chamber by placing a mylar or Plexiglas box over an object covered with Gore-Tex and place a damp blotter inside the enclosure.
Before treatment, careful testing of supports and media with small pieces of Gore-Tex is recommended. The painting was humidified in the Gore-Tex pack over an eight hour period with barely damp blotters. It was then allowed to dry slowly in the Gore-Tex pack replacing the damp blotters with dry.
Not only was the distortion in the support of the painting reduced, but the paper was much more flexible. If an object shows evidence of mold, this might not be the best method of humidification. Be sure to check an object frequently when humidifying it, both for mold and the degree of dampness of the object.
Humidification of an Object With Delicate Support and Media: The second treatment is a Mickey Mantel baseball card, an offset lithograph on laminated card stock. There was a deep crease across the top right corner. Collectors of baseball cards will know, that the better the condition, the more valuable the card is. After trying local applications of humidity and Ethulose to reduce the crease, Gore-Tex was finally tried and the card humidified overall.
It was then flattened between the hard surface of mat boards. I believe this worked because all the layers of the card were equally humid, allowing the broken fibers to be pushed back into place. Local Humidification: A good example of local humidification using Gore-Tex are these drawings of battle scenes.
They were done with iron gall ink on thin, blue wove writing paper by a Blackfoot Indian chief, c. They were disbound recently for exhibit purposes. There were about seven folios adhered together in each section.
Methylcellulose was tried first as a poultice to introduce moisture, but by the time the adhesive softened, the paper was too wet to safely separate the folios.
Figure 4 Figure 5 Small pieces of Gore-Tex and damp blotter strips were used to just cover the central adhered area Figures 4 and 5. By the time the adhesive was removed mechanically from one folio, the next one adhered in the section was ready to be lifted off, that is, the adhesive was moist enough to release it.
This early twentieth century lithograph poster printed on thin wove paper was adhered to a thick cardboard support Figure 6. Therefore, there was no fast expansion where the possibility of tearing in the primary support could occur. Figure 6 In another case, a large 5'x 5' printed lithograph map with hand coloring on very thin wove paper had a cardboard backing twice as thick and dense as this one.
Almost all the colors were soluble with water when tested. Removing it mechanically with a scalpel proved extremely difficult because the cardboard was very dense.
Part 6a. Thinsulate fibres are much thinner than most other artificial fibres like nylon an polyester used in clothing. Human hair is 0. They are produced as a dense tangled web of fibres that trap lots of air between the thin fibres and reflect heat too. Polyesters like polyethylene terephthalate PET , poly propene and poly ethene are used to make Thinsulate.
This considerably reduces heat loss, i. They are supposed to be at least as good as duck down for insulation, but less water-absorbent and resistant to crushing than duck down. The good thermal insulation effect is due to the high density of fibres produced by utilising very fine fibres which increases the efficiency of the air gaps to reduce heat flow.
Thinsulate is supposed to allow moisture to escape e. A further advantage is that thinsulate fibres absorb very little water, so they retain their insulating properties and still keep you warm even if your clothes get wet. House insulation Part 6c. The formation of the polymer of poly tetrafluoroethene by the polymerization of the monomer tetrafluoroethene n is a very large number and can be several thousand!
PTFE is noted for its marked chemical inertness and high thermal stability - very heat resistant, only softens at o C. Allow Cookies. Similar Products. Related Posts. So, […] Read More. Leave a Reply Name. Leave a comment. First Name. Last Name. Gender Male Female. Date of Birth. This process results in PTFE, which takes on either a powder or pellet form, which is then formed into a solid shape using heat. The resulting blocks of PTFE are then heated again and stretched rapidly to form a thin filament.
In most cases, the resulting ePTFE is formed into large sheets that can then be cut into various shapes once cool. GORE-TEX is primarily used in outdoor apparel and sportswear, but this fabric is also commonly used in accessories like gloves and shoes. Originally used exclusively in rain shells and winter jackets, this material is now commonly used in pants and lightweight cycling jackets as well.
Gore introduced its first gloves in GORE-TEX was included in space suits throughout the s, and this material is used in a wide variety of medical applications including sutures and vascular grafts. Gore and Associates operates manufacturing facilities in a variety of different countries.
Examples of nations where W. It is only possible to source this textile from the W. Gore corporation, which charges relatively hefty prices. Gore for certification, which entails an additional fee. This material also has a couple of competitors that are worth noting:. As a result, it is ideal for intensive athletic applications like running and cycling.
In direct response to other technologies that had solved the issues inherent to including waterproof booties in shoes, GORE-TEX developed Invisible Fit, which directly bonds to the outer surfaces of footwear to prevent water entry and subsequent waterlogging.
This GORE-TEX footwear technology focuses more on breathability than waterproofing, but it still provides significant waterproofing benefits.
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