- Hot melt adhesive
:"Glue gun redirects here; for the band Glue Gun, see
Glue Gun (band)."
Hot melt adhesive (or hot glue) is a form of
thermoplastic adhesivethat is commonly supplied in solid cylindrical sticks of various diameters, designed to be melted in an electric "hot glue gun". The gun uses a continuous-duty heating elementto melt the plastic glue, which which may be pushed through the gun by a trigger mechanism, or directly by the user. The glue squeezed out of the heated nozzle is initially hot enough to burn and blister skin. The glue is tacky when hot, but hardens and stops being sticky in a few seconds—a minuteFact|date=August 2008 at most. Animal gluewhich is applied hot has been used in woodworkingsince the time of the Ancient Egyptians. It is heated in a glue potand applied with a brush.
Glue sticks are manufactured in several diameters for different glue guns. The most-used size has a diameter of 11 millimeter (about 0.45 inches). Sticks are available in various lengths, from about 10 centimeters up, although guns will take sticks of any length. Thinner 7 mm sticks are also used. Hot-melt and low temperature glue sticks are available for the different types of gun, and some dual-use sticks melt at low temperatures but can be used at high temperatures without degradation.
For domestic use just a few types of stick are available, and more or less interchangeable. For industrial use many types of sticks are available for special purposes, with the most common diameters being 12, 15, and 45mm. Sticks have different "open times" (the working time to make a bond), varying from a second or two to several minutes. A range of values of viscosity and heat resistance of the bond are available.
A common material for the glue sticks (e.g. the light amber colored Thermogrip GS51, GS52, and GS53) is
ethylene-vinyl acetate(EVA) copolymer. [ [http://www2.itap.purdue.edu/msds/detail.cfm?MSDSID=9396 MSDS - Detailed View ] ] The vinyl acetate monomer content is about 18–29 percent by weight of the polymer. Various additives are usually present, e.g. a tackifying resinand wax. Other base materials may be based on polyethylene, polypropylene, polyamide, or polyester, or various copolymers.
Glue gun specifications and usage
Glue guns come in a low-temperature and a high-temperature (hot-melt) version. Low-temperature glue guns heat up to about 250º F (120º C), and are well suited when high temperatures are undesirable, for
lace, cloth, children's crafts, etc. High-temperature guns heat up to around 380°F (195°C) and produce a stronger bond. "Dual guns" have a switch for both low- and high-temperature use.
In addition to bonding surfaces together, hot-melt glue can be used to fill gaps, but the properties that allow gap-filling (high viscosity, high toughness, or lack of brittleness, and so on) keep it from forming an adhesive film as thin and smooth as is possible with other adhesives. (For example, a wood joint properly made with hide glue may be invisible, marked only by a difference in grain at the seam line.) Bonds must be made quickly before the glue has time to cool and harden. Usually it must be applied accurately with the glue gun, as it can not easily be spread, but it is always possible at any time to melt and spread the glue with a
heat gunor a household clothes iron, which helps when bonding larger areas.
Surprisingly hot-melt glue can be used to assemble and repair foam models as an alternative to foam safe Cyano or UHU POR adhesive. Due to the insulating properties of the foam the hot-melt glue stays sticky for much longer than when used on wood, metal or plastics.
* Hot melt adhesive is used for disposable diaper construction where it is used to bond together the nonwoven material with the backsheet and the elastics.
* Hot melt adhesives are used to close
corrugated fiberboard boxesand paperboard cartons.
* Crafts in the home
* Assembly of parts in manufacturing
Arrowheads may be held on with hot glue, allowing removal (e.g.recovery of head from a broken shaft) with the heat from a small flame.
* Assembly and repair of foam model aircraft
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Look at other dictionaries:
hot-melt adhesive — hot melt, hot melt glue or hot melt adhesive noun An adhesive that is applied hot and which sets as it cools • • • Main Entry: ↑hot … Useful english dictionary
hot-melt adhesive — lydaliniai klijai statusas T sritis chemija apibrėžtis Klijai, kurie prieš naudojimą išlydomi. atitikmenys: angl. hot melt adhesive; hotmelt adhesive rus. клей расплав; термоплавкий клей … Chemijos terminų aiškinamasis žodynas
hot melt adhesive — noun A solvent free, solid adhesive that is melted by heating for use Syn: hot glue, hot melt glue … Wiktionary
Hot-melt adhesive — Термоклей … Краткий толковый словарь по полиграфии
hot melt — hot melt, hot melt glue or hot melt adhesive noun An adhesive that is applied hot and which sets as it cools • • • Main Entry: ↑hot … Useful english dictionary
hot-melt glue — hot melt, hot melt glue or hot melt adhesive noun An adhesive that is applied hot and which sets as it cools • • • Main Entry: ↑hot … Useful english dictionary
hot melt glue — noun hot melt adhesive … Wiktionary
hot-melt — noun Date: 1939 a fast drying nonvolatile adhesive applied hot in the molten state … New Collegiate Dictionary
Adhesive — Glue redirects here. For other uses, see Glue (disambiguation). For the band, see Adhesive (band). Nitrocellulose adhesive outside a tube An adhesive, or glue, is a mixture in a liquid or semi liquid state that adheres or bonds items together.… … Wikipedia
adhesive — A substance (like glue) that is used to join two substances. An adhesive must bond both mating surfaces through specific adhesion (molecular attraction), through mechanical anchoring (by flowing into holes in porous surfaces), or through fusion… … Dictionary of automotive terms