Tapes and labels

Pressure-Sensitive Tape and Label Surface Coating Operations... 

Besides the typical tape and label products discussed earlier, larger sheeting products are often applied using pressure sensitive adhesives. Examples of these sheeting products include ... 

Jagisch, F.C., Novel radial styrene-isoprene polymers for pressure sensitive adhesives. In Proceedings of the European Tape and Label Conference, Antwerp, Belgium, April 18, 1997. 

Release coatings are important components of pressure sensitive adhesive (PSA) products such as tapes and labels [1]. Release materials are coated onto the backside of PSA tape backings (often called low adhesion backsizes or LABs in this form) to provide the desired tape roll unwind force. They are also coated onto various substrates to form release liners for PSA products such as labels and transfer tapes. Typically the thickness of the release coating is less than 1 p,m, and often times less than 0.1 jLm. Release coatings can be thought of as the PSA delivery system, providing a controlled unwind or release force and protecting the adhesive from contamination and unintentional contact until it is applied. 

Hot melt aerylie polymers for UV cure are generally of lower moleeular weight than their solution counterparts in order to maintain an aceeptable application viscosity. Consequently more crosslinks are needed to produce a complete network and thus peel and tack suffer to some degree. Nonetheless, several UV curable materials have been commercialized for PSA tapes and labels. 

As should be apparent from the variety of applications, there are many test methods for hot melts, most of which are application specific. Many such tests were developed by adhesive suppliers and are proprietary to them. The use of standardized testing is most common for PSA tapes and labels. These tests are discussed elsewhere in this volume. 

Bostik, Inc., formerly Bostik Findley, Inc., is a leading global producer of adhesives and sealants. The firm operates in five segments construction and distribution performance adhesives nonwovens/tape and label global transportation and flexible laminating. The construction and distribution division manufactures flooring installation adhesives for tile, stone, hardwood, carpet and vinyl caulks, elastic adhesives, aerosol adhesives, fire-retardant adhesives, epoxies,... 

Standards of Performance for the Graphic Arts Industry Publication Rotogravure Printing Standards of Performance for Pressure Sensitive Tape and Label Surface Coating Operations Standards of Performance for Industrial Surface Coating Large Appliances Standards of Performance for Metal Coil Surface Coating... 

The flexibility of PVC film makes it ideal for many industrial tape and label applications. Unfortunately, PVC film can be difficult for many adhesives to bond to and transfer failure is common. This can lead to long-term debonding as well as reduced holding power and chemical resistance. An in-depth look at PVC adhesion is provided and a solventbome adhesive with superior anchorage to PVC films as well as improved heat-resistance is described. 4 refs. 

Poly(vinyl ethers) have extensive uses as nonmigrating tackifiers in adhesives and particularly pressure-sensitive tapes and labels, as viscosity-index improvers in lubricants and as plasticizers in coatings, films, and elastomers. They are available and used in dry state, solution or as blends with a wide variety of compatible polymers and copolymers. 

Cut small slits in two micropipets as shown. Obtain a 0.020-g sample of magnesium ribbon from your teacher and insert the magnesimn into the bulb of one pipet. Obtain a 0.022-g sample of aluminum foil and insert it into the bulb of the other pipet. Seal the slits with transparent, waterproof tape and label the two pipets Mg and Al. 

Pressure-sensitive adhesives are the essential components of adhesive tapes and labels. They are polymers with permanent tack, usually applied on substrates (plastic/metal films, siliconized papers). To enhance their tack, compounds with high inherent tack are added, for example, resins, plasticizers. Pressure-sensitive adhesives reach their adhesion on the material to be bonded by contact pressure, from which the term pressure-sensitive adhesive (PSA) derives. Apart from electron radiation, also UV-radiation curing described in Section 4.3.2 is applied in adhesive tape manufacturing. The monomer molecules to be polymerized are applied, in liquid form, to the substrates to be coated by rolling and are continuously cured to a polymer layer within seconds under a UV-radiation source. Depending on their composition, predetermined adhesion values can be adjusted. The adhesive tapes can be subsumed under the systems shown in Figure 5.4 ... 

Pressure-sensitive adhesives (PSAs) are used in various forms for packaging, medical and masking tapes and labels. PSAs are viscoelastic materials that exhibit sohd-like and liquid-like behavior so that their performance can be evaluated by tack (the capability of a PSA to adhere instantly under light pressure), peel strength (the tensile force required to remove a PSA) and shear strength (flow resistance) [1, 2]. 

Other hot melts are based on low molecular weight polyethylene, combined with tackifying agents. These tend to be lower in cost and performance than the EVA-based hot melts, and they are used primarily with paper packaging, such as cartons and multi-wall bags. Atactic PP can also be used as the base for hot melt adhesives. Pressure-sensitive hot melt adhesives for tapes and labels often employ thermoplastic elastomers, consisting of block copolymers of styrene and butadiene or isoprene. 

When 1 joined Chemsultants, we were heavily involved with the PSA industry—probably 75% of our business back then was directly related to pressure-sensitive adhesives. Most of the work we did was on PSA tapes and labels. Today, only about 25% of our business involves PSAs. 

Uses Release coating for hot-melt, acrylic adhesive pressure-sensitive tapes and labels of PP, PE, polyester, cellophane, foil, and paper Features Prevents delamination and tearing of the substrate Properties Wh. dry powd. sol. in toluene, heptane, hexane. Shell Cypar m.w. 135,000 m.p. 87-93 C cloud pt. < 25 C (5% in toluene) 99.5% min. assay... 

Uses Water repellent, release agent used on paper/paperboard for water-repellent pkg. materials, food pkg., grease-resistant and release paper when used with PVA, release and grease-crawl-resist, paper for industrial release sheets for prep, of plastic laminates, food separators and pan liners, separator sheets for pressure-sensitive tapes and labels, water-repellent coatings and adhesives Regulatoiy FDA approved for food pkg. 

Uses Latex for use as a release coaling provides high gloss, block-resist. coatings with exc. release against pressure-sensitive adhesives used in many tape and label applies. 

Bemmels, C.W., Pressure-sensitive tapes and labels. Handbook of Adhesives (I. Skeist, ed.), 3rd ed.. Van Nostrand Reinhold, New York, 1990. 

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