Лако-красочные материалы — производство

The work done in testing pressure-sensitive adhesives in the 0.01 in. (0.25mm)/min area has yielded an interesting new research test method, given the name of the butt tensile test. The standard 90° peel test is one of tensile stress, but there is a continuous change in the adhesive under examination as the peel front recedes. […]

There may be a tendency, with time, for a pressure-sensitive adhesive tape to slowly curl away from the surface to which it is applied, usually owing to a prolonged slight stress coupled with stress relaxation within the adhesive. Conventional testing may not indicate this weakness. One way to study this is to use a modified […]

Almost all electrical tapes have thermosetting adhesive characteristics, and a suitable test to measure satisfactory thermosetting has been described in Section II. B. Many electrical tapes are used to wrap coils of various diameters, and there may be a tendency for the end of the tape to lift away after application, known as flagging. This […]

This testing is in addition to the high temperature testing described previously. High temperature masking tape can be applied to a variety of surfaces—plain, primed, or painted; metal, glass, rubber or chrome finished—and testing must include them all. The simplest test is to apply the tape to the appropriate surface, subject it to the heat […]

While packaging needs remain a major concern of the appliance industry, one other cause for concern with pressure-sensitive adhesives is the potential for staining on painted sur­faces. A pressure-sensitive adhesive system may come into contact with a painted surface, either temporarily during the manufacturing process or for prolonged periods of storage, following which, on removal […]

Packaging in industry is universal; the need in most cases is the ability of a pressure — sensitive adhesive that will hold well to cardboard surfaces under stress. A simple intro­ductory test would be to determine whether the adhesive wets out the surface well enough to delaminate the cardboard. Although this is a subjective test, […]

Here the adhesive is applied under standard conditions to whatever test surface is felt appropriate. The test, usually adhesion or shear, is then carried out in the high tempera­ture environment, after allowing sufficient time for the assembly to reach the test tem­perature before beginning the test. Visual examination for signs of cohesive failure is a […]

Low temperature testing can be to determine whether the adhesive can be applied effec­tively at that low temperature, or whether it functions satisfactorily when in use at that temperature. Both require the use of a cold box with access to manipulate the samples and test equipment, the test equipment being either totally or partially enclosed […]

The usual function of an aging test should be to challenge the product artificially in an accelerated manner in one or more environments that can be expected, so that either after prolonged storage or after long periods of use its behavior can be predicted. The popular accelerated aging temperature used to predict natural aging is […]

The test methods presently used to evaluate the adhesion of pressure-sensitive adhesives to release liners are modified adhesion tests, such as the 180° or 90° peel test, with the liner adhered to a test panel, or a T-peel test, where the sample is freely suspended while the tape is peeled at a controlled rate from […]