TORAYPEF® Polyolefin Foam

Technical Information | Easy to process

TORAYPEF® can be very easily processed. See below for comments on some general processing methods.

Shearing and cutting

TORAYPEF® can be easily cut using scissors or a razor. Use an electric-powered saw or virtual cutter designed for cutting plastics or wood to rapidly cut clean surfaces when cutting large volumes of thick samples. A Thomson cutting machine designed for cardboard can be used to punch out sections or bore holes in TORAYPEF®. Machines used on general plastic sheets can be used to slit or make rectangular beads. A heated knife (hot-wire cutting machine) can be used, also, but it is easier to obtain clean-cut surfaces with a rotary knife.

Slicing

A slice machine using a rotary knife can easily slice TORAYPEF® into the desired thickness down to 1 mm. Using similar methods, a profile cutter can be used to create waveforms on the surface.

Welding and heat fusion

TORAYPEF® can be bonded using heat-welding or an adhesive. TORAYPEF® can create a strong bond with another TORAYPEF® surface, a steel plate or an aluminum plate by means of heat fusion. To easily perform heat fusion in a manual operation, use a hot-air gun or a Teflon-coated hot plate. TORAYPEF® has been treated with electron-beam irradiation, so it has enhanced adhesiveness compared to ordinary non-cross-linked polyethylene foams. However, a sliced surface is porous, so apply adhesive liberally. Table 1 shows examples of adhesives that bond with TORAYPEF®. The SP grade comes with adhesive pre-coated at the factory. The EC grade features corona discharge treatment to improve adhesion.

Table 1: Types and descriptions of adhesives for TORAYPEF®
Name Make Component Diluen Usage Counterpart substrates Remark

Diabond

 DC-761D
 (for summer)
DC-6105
 (for winter)
Nogawa Chemical Chloroprene Toluene Apply to both bonding surfaces, dry sufficiently, then paste together bonding surfaces. Steel plates
Aluminum plates
Concrete
Paper
Wood
Others
Works with spray, roll-coating or brushing.
All-purpose adhesive with good water-resistance
Saivynol
EX-6E (for summer)
EX-8 (for winter)
Saiden Chemical Industry
Aqueous bonding agent 7 Sumitomo 3M Acrylic Water Apply to one of the bonding surfaces, place in oven for some time, then paste to counterpart surface. Concrete Others Suited for applications where solvents cannot be used.
Hi-Bond
DA-7663
Hitachi Kasei Polymer Polyester Toluene Ask the manufacturer. Effective with soft PVC sheets  

Extrusion lamination

Extrusion-laminate a polyethylene- or ethylene-vinyl acetate copolymer to enhance tear strength or surface-wear strength.

Molding

TORAYPEF® is a cross-linked, closed-cell polyolefin foam; general molding machines can be used without modification to perform vacuum-molding or press-forming. A sheet that had sagged but is taut again is suited for molding. The moldability of TORAYPEF® varies by grade, but the PE grade exhibits a thermofoaming ratio of about 0.5 using a straight method. The PP grade has a ratio of 0.6-1.0. Shrinkage in a molded product is about 2-3%, so exercise caution when designing the mold. If bridging is seen in the molded product, often changing the direction of the clamps will fix the problem. Besides TORAYPEF® alone, laminates of TORAYPEF® with a polyethylene sheet, polypropylene sheet, polyvinyl chloride sheet, an ABS sheet or a nylon knitted fabric can also be molded.

Surface treatment

Most printing methods such as gravure, silk-screen, offset and flexo printing methods can be used to print a sufficiently clear image on TORAYPEF®. Other processes such as embossing, flocking, coating or painting may also be used with TORAYPEF®.

These data are representative examples of measurement values obtained using specific conditions. The values should not be used as a standard.