Envelope glue

Starches, especially modified starches, are also used as glues in cardboard manufacturing. Starches such as gum arabic and gum tra-gacanth are used as the glue for stamps and postal envelopes. 

Gum arabic (gum acacia) is used as the lickable glue on stamps and envelopes, and as a flavor stabilizer (emulsifier) in soft drinks. It has components that bind to water, and components that bind to oils, making it an emulsifier but not a surfactant (because of the high molecular weight). 

PVP is short for the polymer poly (vinyl pyrrolidone).1021 When PVP is left in the open air it absorbs around 15% of its weight as water from the air, such is its ability to cling to water molecules. It is also used in various personal care products like shampoos, toothpastes, and is the adhesive which has replace animal-based glues on envelopes and postage stamps. 

The most widespread use of limonene has been as a raw material for the manufacture of adhesives, such as the glue on labels and envelopes. Terpene monomers used for resin production are pinene, dipentene from turpentine and rf-limonene. Waterless hand cleaners produced from d-limonene were among the first to replace solvents such as mineral spirits. Although ri-limoncnc is more expensive than mineral spirits and kerosene, the former is used because of the pleasant citrus aroma and its claimed biodegradability (Coleman, 1975 Kutty et al., 1994). Many flavor chemicals... 

Sweetmouth glue Glue which is to be wet with the tongue, as stamps, envelopes, slightly sweetened eo it won t taste bad. 

The glue that you lick on the seal of an envelope is typically a substance called gum arable, which is made of polysaccharides and glycoproteins. This gum can be found in the sap of acacia trees. 

Animal glues are used widely in a variety of ways with paper. For example, they have been the dominant adhesive for rewettable gummed paper tapes, labels, and envelope seals [69]. They are an important coadditive with synthetic wet-strength resins and rosin sizes for coated paper products [70]. They have been a primary binder for the grit that forms sandpaper [71]. 

Kerosene solubilized with 4% by weight of mixed isoprapanolomine and 15% by weight of oleic acid produces stable emulsions with water upon mechanical agitation. Stable water emulsions of chlorinated hydrocarbons or naphtha may be prepared by a similar procedure. The addition of about 2% by weight of mixed isopropanolamine has been found ta improve the penetration of starch glues into heavily sized envelope stock. 

Envelope flaps to be coated with the latex gum sealing glue... 

Figure 54 Slot die application of water-based glues in the Winkler Diinnebier envelope machine the closely overlapping sheets of paper are coated by the slot apphcator as a continuous band. Later the sheets of paper are coated with glue and folded in order to...

Fig. 62 shows how typography system works for the glueing of an envelope window. This technique may be very fast, up to 800 windows per minute on the Winkler-Dunnebier German machines with ethylene-vinyl acetate adhesives, viscosity 3000 mPas. 

For example, starch is the principal water-dispersible natural polymer used industrially as an adhesive and in its many forms it is widely employed in the paper and paper products industry. Poly(vinyl acetate) and its copolymers are synthetic materials and are usually used as aqueous latices. They have found widespread used in the paper industry, where their often superior properties offset their higher price, and are used in bookbinding, milk cartons, envelopes, etc. and are also very familiar as the household white glue for woodworking. 

Protein matrix Type of protein present in the endosperm of cereals that envelops starch granules. It is constituted of high-molecular-weight glutelins that forms the continuous matrix which glues and imparts the structure of endosperm cells. Both proteins from the matrix and protein bodies form the gluten. 

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