Лако-красочные материалы — производство

Four processing steps for the production of hygienic papers, (e. g. toilet paper, kitchen rolls) involve the use of adhesives: Tube Winding. Mainly dextrin adhesives are used and/or plasticized homopoly­meric poly(vinyl acetate) emulsions, but glutin glues are also used in special cases. Pick-up adhesives bond the tissue to the Kraft paper tube. Depending on the […]

In general two types of adhesives are used for the manufacture of baby diapers, feminine-hygiene, and incontinence products. For simple construction purposes, hot — melt adhesives based on amorphous poly(alpha-olefins) (APAOs) are used. High-quality constructions are produced with adhesives based on styrenic block copolymers. For bonding of elastic materials such as polyurethane foam, lycra and […]

Manufacture of Corrugated Board. For this purpose starch suspensions are used almost exclusively. Some of the starch is gelatinized under the heated corrugating rollers which form the corrugation, thus insuring high initial tack. The use of emulsion — based or hot-melt adhesives is confined to special cases. Hitherto, it has been discour­aged by the relatively […]

It is possible here to select only typical examples for each subheading. 1.9.1. Bookbinding Bookbinding with adhesives has played an important role since the beginning of the production of graphical products [185]. Originally, vegetable and animal raw materials were the main ingredients of adhesives, but a steady development of the adhesives took place to fulfill […]

The testing of adhesives comprises two aspects: 1) The adhesive as an individual compound 2) The performance in the actual adhesive joint that is formed between substrates Generally the following adhesive properties are determined: — Solids content — Rheological properties — Shelf life or storage temperature range — Mechanical properties: tensile strength, modulus, Shore hardness, […]

Cleaning and Pretreatment of the Surfaces to be Joined. To insure good adhesion of the adhesives, the surfaces to be joined must be cleaned before the adhesive is applied. Layers of grease, oil, and lubricant are removed by means of solvents or aqueous degreasing baths. Loose dirt and oxide layers can be removed by brushing. […]

Conductive adhesives include both electrically and thermally conductive materials. Most adhesive fillers that result in electrical conductivity in a material also contribute to its thermal conductivity. However, thermally conductive adhesives that are elec­trically insulative are also available. The majority of applications involve the use of silver, either in flake or powder form. This filler is […]

Most UV/EB adhesives are based on an addition polymerization curing mechanism. They consist of acrylic esters of various types or combinations of acrylates with aliphatic or aromatic epoxy resins, urethanes, polyesters, or polyethers. Although the epoxy­based systems have higher tensile strengths, their elongations are less than those of the urethane-based systems. In addition, the urethane-based […]

Adhesives for joining unvulcanized elastomers to metals or plastics under vulcani­zation conditions are called rubber-to-metal bonding agents. Mixtures of film-forming components, cross-linking agents, and stabilizers dissolved in organic solvents are used as bonding agents. The solids content varies from about 15 to 25 % according to type. The film-forming components used are chiefly halogenated polymers, […]

Polyhydroxymethyl Compounds. Hydroxymethyl compounds that release water during condensation are used primarily for polycondensation adhesives. Accordingly, the high-quality bonding of impermeable substrates requires relatively high pressures to compensate for the water vapor pressure developed during hot setting. Polycon­densation adhesives are used both in pure form and as solutions in water or organic solvents. Hardening can […]