Cooling tape material

The use of coatings applied in the form of tape is also increasing. Polyethylene and polyvinyl chloride films, either self adhesive or else supporting films of butyl adhesive, petrolatum or butyl mastic are in use as materials applied cold at ambient temperatures. Woven glass fibre or nylon bandage is also used to support films of filled asphalt or coal tar and these are softened by propane gas torches and applied to the steel surface hot, cooling to form a thick conforming adherent layer. 

Distillation was performed using a 30-cm. vacuum-jacketed column wrapped with heating tape and containing a spiral of wire (Nichrome or Chromel) in the center bore. The receiver portion of the assembly contained two flasks, one to collect the material that distilled below 72° and another for the desired fraction. An air-cooled condenser was used with this apparatus, since water cooling often causes the product to solidify and clog the condenser tube. 

Print adhesion on plastics (and foil) is normally checked using a self-adhesive tape peel test. A few inches of a suitable standard tape is firmly pressed onto the print area then pulled off, slowly at first, then more rapidly. An assessment of print adhesion can be made from the quantity (ideally none) removed. Adhesion can vary according to the type and colour of the ink, the degree of pretreatment, the surface involved and the printing process, etc. In order to test print under likely use conditions, product immersion tests may be necessary 60°C (140°F) is a frequently used condition, for 3 to 6 h. If product-pack may be used with soapy hands, a solution of soap can be employed. A print adhesion test, as above, can then be carried out, on the washed material, after it has been cooled to room temperature. 

EPDM/PE Blends Blends of EPDM with PE were made (90 rpm, full water cooling) by using upside down loading, and the batch was discharged at 140°C in 4-5 min. [Grossman, 1977] (Table 11.9). The material was sheeted on a mill, then extruded (3/4 inch extruder, L/D = 10/1, with a 1.5/1 single rubber-type screw) as a 20 X 5 mm tape. For the heat cure, the materi-... 

The neat resin was prepared by casting. The epojgr material was first subjected to degasification at 85°C inside a vacuum oven. The softened liquid v as then poured into a preheated mold. The curing schedule was 121°C for 2 h and 177°C for 2.5 h, followed by a slow cooling at ca. 0.5°C per m n. to room temperature. Symmetrically reinforced (i45°) g Thomel 500/Fiberite 954 laminates were fabricated from prepreg tapes obtained from Piberite Corporation. The details on specimen fabrication are described elsewhere (8). 

---