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Plastic bottles: a diamond like coating (DLC)

Zdroj/Source: Chemical Engineering, Feb. 2004, Vol. 111, No. 2, P: 16
 

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HOME Archiv 2004 31.03.2004 Plastic bottles: a diamond like coating (DLC)

DG PETCORE Frank Koelewijn: "I am concerned with the haste with which legislators in candidate countries scramble to impose laws just to meet EU requirements. They risk making costly mistakes." (in PETCORE June,14,2002 "European PET bottle recycling breaks new records")


Mitsubishi Heavy Industries Ltd., (MHI; Nagoya, Japan; mhi.co.jp) has developed a machine to apply a new gas-barrier coating — composed of diamond like carbon (DLC) — for plastic beverage bottles. Developed in cooperation with Mitsubishi Shoji Plastics Corp. (Tokyo), the machine uses radio-frequency (RF) plasma coating technology originally developed by Kirin Brewery Co. (Tokyo).

 The DLC-coating machine (figure) is composed of four basic units: a bottles feeder, a rotating wheel for coating the bottles, an air cleaner, and a bottles discharge unit. The wheel holds bottles in individual chambers. Each bottle undergoes a sequence of steps as the wheel rotates. First an electrode is introduced into the bottle, then the chamber is evacuated. Acetylene is then introduced and atomized by an RF-discharge to form a 200-400 A layer of DLC on the inner surface of the bottle. The bottles are subsequently cleaned by air and released from the wheel.

The coated layer has a carbon structure resembling that of diamond, but shows some flexibility due to the presence of some hydrogen atoms in the structure. DLC-coated polyethylene terephthalate (PET) bottles exhibit ten times the gas-barrier properties for O2 and CO2 compared to non-coated bottles.

DLC-coated PET bottles are already approved by the U.S. Food and Drug Administration (Washington, D.C.) and offer the added benefit of being recyclable. One ma­chine can coat 12,000 to 18,000 bottles/h, and can accommodate 0.3-1.5-L PET bottles. MHI will deliver its first commercial unit to a blowmolder in June.

 

 

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