Dual laminate construction

TABLE 25-20 Dual-Laminate Construction and Lining Properties... 

The principle of dual laminate construction is to line an FRP vessel or column with a fluoropolymer lining. However, the sequence of construction is to first make the liner out of fabric-backed sheets the same as in the adhesively bonded construction. The FRP structure is then laminated on the liner to pro-... 

Figure 8.22 Machine butt welding of fluoropolymer prior to dual laminate construction. (Courtesy CPF Dualam, Montreal, Canada.)...

Figure 8.24 Supply chain and Job sequence for dual laminate construction.

The dual laminate construction lessens the problem of permeation through liners. If there is permeation, it is believed to pass through the RTF structure at a rate equal to or greater than through the fluoropolymer itself, resulting in no potential for collection of permeate at the thermoplastic-thermoset interface. If delamination does not occur, permeation is not a problem. 

For the thermoplastic fluoropolymers, rotolining is proving to be a reliable and versatile method for lining complex parts. The need to eliminate flanged connections wherever possible is increasing interest in dual laminate constructions that permit welding of joints. 

Like piping, lined vessels can be constructed as dual laminates with FRP. In some uses, these are preferred to lined steel vessels because the FRP vessels often have sufficient chemical resistance to prevent damage by spills, and they do not require periodic painting to prevent rusting. Also, because they weigh less, they need less support so installations can cost less. 

Veneer and solid wood composite products are manufactured for building and construction commodity markets and for specialty markets such as marine applications and aesthetic decor. Bonding systems vary based upon the service demands placed upon the final product, interior versus exterior. Construction and decorative plywood are veneered panel products. Laminated veneer lumber (LVL) is a veneer product which competes with lumber. Lumber laminates form majestic beams often for dual structural and aesthetic applications. 

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