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1、Selecting and Using Foam Backed Pressure Sensitive TapesPressure sensitive tape can be manufactured with a foam backing and a pressure sensitive adhesive on either one or both sides of the foam. These products are generally known as mounting tape, double backed foam tape, or very high bond (VHB) tap
2、e - a term used by 3M Company, one of the major suppliers of this product.The most recognizable applications are for securing objects such as pictures on walls and attaching plastic body side molding to automobiles. Foam tapes have unique physical characteristics that make them appropriate fasteners
3、 in semi-structural applications as well. These important applications include shear wall construction for housing and replacing mechanical fasteners in appliances. Many other sensible structural applications are also possible. Foam backed tapes with PSA on only one side can be used as a cushioning
4、gasket for sealing and insulating objects such as window frames on residential homes and automobiles. They are often found in the do-it-yourself section of local stores for home weather stripping. Whether adhesive is on one or both sides of the foam, these products must have special physical propert
5、y requirements both for the adhesive as well as for the foam backing. This article will review the various types of foam tapes that are commercially available, their main applications, and considerations that need to be taken into account when using these products. Double sided foam tapes generally
6、consist of four components as shown in Figure 1. These are: The carrier material, which is a foam, A layer of pressure sensitive adhesive on one side of the foam, A layer of pressure sensitive adhesive on the second side of the foam (possibly different from the adhesive on the first side), and A rel
7、ease liner covering one or both of the adhesive layers. (A single release liner is generally used when the foam tape is manufactured in roll form, and two release liners are used when it is manufactured and sold in sheet form.) Double sided foam tapes sometimes use different adhesive types depending
8、 on the application. For example, one side may contain a permanent adhesive while the other side uses a removable formulation. Figure 1: Double sided pressure sensitive foam tape. What separates these products from other pressure sensitive products is the foam backing or carrier material. The backin
9、g in standard (non-foam) tape constructions includes paper, films, non-wovens, fabrics, and other materials. However, polymeric foam provides good gap filling characteristics, compressibility, and resilience, which contribute to the tapes unique overall performance properties. There are several poly
10、meric foams (see following section) that have been found to be useful in foam tape construction. The choice often depends on the conditions that the final assembled product will experience when in service. The foam carrier comes in various thicknesses to fill the gap between substrates. It also come
11、s in different densities to provide a range of compressibility, strength, and other properties. Lower density foams are generally used for sealing and gasketing, and higher density foams are employed for mounting. Because the foam has a degree of movement or elongation capability, the tape can be ap
12、plied to substrate that is extensible and conformable without significantly affecting those properties.The adhesive that is used in constructing the foam tape must, of course, have pressure sensitive characteristics. This is provided by the viscoelastic properties such as elongation, stress relaxati
13、on, and strain rate dependence of the base polymer used in the adhesive formulation. An optimum combination of these properties is necessary for instantaneous adhesion and adequate tack, peel, and shear strength properties. The adhesive must also have sufficient durability to meet the demands of the
14、 application. There are many pressure sensitive adhesives that could be used in foam tape construction and the selection will depend on the application. Although several adhesive systems are used for constructing foam backed tapes, in structural applications only high quality and durable PSAs, such
15、as high-performance acrylic adhesives, are used. The release liner plays an important role in storage, transfer, and application of the adhesive. There are four basic types of release liners used in pressure sensitive tape construction: Kraft paper release liners are generally the least expensive bu
16、t tend to wrinkle when exposed to humidity. Clay coated paper liners, in contrast, hold their shape in humid conditions and withstand high temperatures but tear easier than Kraft papers. Polycoated paper liners cost more than Kraft or clay coated paper liners but better resist humidity, will not wrinkle, and also lay flatter. However, polycoated paper cant withstand elevated temperatures. Film liners such as LDPE, HDPE, polyester, or p
