Pressure sensitive adhesive can be supplied dissolved in normal solvents, as an aqueous dispersion, as a hot liquefy, or coated on release liner as tape. Dissolved applied (solvent and water based, hot melt) pressure sensitive adhesives may be applied in bead or even ribbon, sprayed, or move coated. After coating (together with drying of solvent or water based systems), parts can be bonded or the adhesive covered with release liner with regard to bonding later. The adhesive may be coated in a pattern to deliver bonded and unbonded spots, e. g. assembly associated with membrane switches, filter eyeglasses. adhesive tape
self adhesive

Artificial aging and chemical extraction techniques are of help in testing papers, but those analyses cannot predict the longer term state of either type of pressure sensitive adhesive. They did get a reprieve briefly during the war in the Persian Gulf, where moist conditions caused problems for ordinary stamps, until Congress authorized free postage with regard to active-duty military personnel.

Additionally in 1989, USPS experimented with self-service Autopost computer vended postage accessories, which dispensed self-stick rubber (called “metered postage strips” with USPS literature) printed individually during the time of the transaction, and and them a companion label in addition to a receipt. Autopost machines were located in two post offices, on in Washington. The experiment was deemed a failure, and the machines were taken out of service in mid-1990.

Experimental self-stick stamps for use in banks’ automatic teller machines were issued in 1990, owning a 25-cent stylized Flag pattern, in panes of 12 stamps, printed on plastic. We were looking at tested by Seafirst bank to get a period of six a few months, at 22 ATMs within 10 Seattle, Washington, locations. Although these panes, exactly the size and shape of U. S. foreign exchange, were trademarked EXTRAordinary, they sold at face value on the public. A non-denominated F-rate (29-cent) version with the plastic ATM stamp was issued for the 1991 increase in your domestic letter rate.

Total, the ATM experiment was deemed roaring success, and distribution was extended near to Equibank ATMs in this Pittsburgh, Pennsylvania, area and later to other banks along the land. But the plastic on which the first two ATM rubber were printed proved some sort of bane to paper recyclers, therefore, the next ATM issue, that 29-cent Liberty Torch stamp of 1991, while enhancing the self-stick feature, was printed on stamp paper, as are all subsequent issues.

Following successful tests associated with prototype Postage Validation Imprinter equipment at a handful of post offices in the 1980s, computerized PVI terminals were deployed at post office meters nationally beginning with April of 1992, replacing post office meters. Pressure sensitive adhesive

On self-sticks, the die cut is usually clean and shaped being a wave; on stamps with traditional gum, the edge between the perforation holes usually is ragged and fluffed and chopped straight if affixed by the mailing machine pressure sensitive tape.