Highly transparent polypropylene (PP) sheet without nucleating agents
PURETHEMO is highly transparent and easily thermo-formable PP sheet produced by a unique processing process and material design. PURETHEMO is widely used for food packages, lids and medical packages.
2001 AOKI-KATASHI AWARD
2011 James L. White Innovation AWARD
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PURE THERMO™
Transparency and gloss
A newly developed technology to control PP crystallization has made it possible to produce clear, transparent PP sheet.
Generally, PP develops large crystal structures . If the spherulite has a comparable size of visible light wave length (ca.400-800nm), visible light cannot go straight through the PP sheet. PURETHERMO has no such spherulite structures.
Thermoformability
Transparent sheet with nucleating agent has high melting temperature so that precise temperature control is necessary in thermoforming process. PURETHERMO softens in lower temperature than such general PP sheet. It means broad thermo-formable temperature range can be obtained.
Rigidity
Thermoforming process brings about crystallization in PURETHERMO and the sheet crystallinity increases. But PURETHERMO can maintain its fine structure. The high crystallinity and fine structure make PURETHERMO transparent and rigid.
PURETHERMO has a comparable rigidity of general PP.
Excellent adhesion grade
Idemitsu Unitech’s proprietary special surface treatment improved the film’s adhesion with printing ink. This offers flexibility in the design expression of PP decorative molding.
PURETHEMO is resistant to oily food or heat in common with general PP.
Conventional products
Heating up in microwave oven sometimes causes package deformation, especially if the package contains oily foods. The temperature sometimes becomes over 100 degree Celsius so that packages for this application need to be resistant to heat. PURETHEMO has been shown good performance for this application.
PURETHERMO
Medical packages are often sterilized by ethylene oxide gas or autoclave. They also need see-through appearance.
Our proprietary crystallization control and special surface treatment techniques have embodied our decorative PP sheets with high transparency, formability into complex shapes, and good printing ink adhesion, making them ideal for decorative molding purposes.
These sheets are suitable for insert injection molding , in-mold injection molding, and over-ray forming.
Monomaterials can be produced by combining this sheet with molded PP parts, which increases the ease of recycling.
・Industrial materials: electronic component trays and battery blister packs
・Blister for general merchandise: files and writing material blister packs
・Sanitary goods: tooth brushes, cotton buds and gauze blister packs