Characteristics of BEMCOT™

Low particle generation

Low fallen fibers
We divide particles into the following categories
Particles
[Fallen fibers]Fallen particles 100μm or larger and visible to the human eye
[Micro particles]That are not visible, but can be measured by a particle counter(0.1μm or larger)

Fallen fibers comparison

Wipers are immersed in 300 ml of deionized water and subjected to ultrasonic treatment for 15 minutes.
Remaining fibers filtered by filter paper is counted

Test Method :
Asahi Kasei Method

Graph:Fallen fibers comparison

Comparison of fallen fibers performance by each testing method

General cellulose nonwoven wipers are made of short fibers.
Therefore their fibers can easily fall due to the friction from wiping and when immersed in liquid. Since BEMCOT is made of a continuous filament, fallen fibers can be reduced.

Test1Wet agitation test

Wipers are immersed in 300 ml of deionized water and subject to ultrasonic treatment for 15 minutes. The water is then filtered. The photo shows the fallen fibers filtered by the filter paper.

Test Method :
Asahi Kasei Method
  • BEMCOT™
  • Polyester knit wiper
  • Staple-fiber rayon/polyester nonwoven wiper
  • Papar wiper(wood-pulp)

Test2Fluffing after wiping test

A silicone board is wiped with a fixed load and at a fixed speed. Fluffing on the surface of wipers is compared after wiping.
(Load: 22.2 g/m2; Speed: 1.0 m/min1; Distance: 40 cm)

Test Method :
Asahi Kasei Method
  • [BEMCOT™] Wiping with a fixed load and at a fixed speed - Almost no fluffing and single yarn damage is observed the surface
  • [Polyester knit wiper] Wiping with a fixed load and at a fixed - speed The knitting structure is broken by friction.Fluffing and single yarn damage is observed.
  • [Staple-fiber rayon/polyester nonwoven wiper] Wiping with a fixed load and at a fixed speed - Major fluffing is caused by friction.Single yarns are cut and damaged.

Test3Adhesive cellophane tape peel-off test

Place a piece of adhesive cellophane tape on the wiper surface and compare the amount of fibers adhered to the tape after peeling it off.

Test Method :
Asahi Kasei Method
  • BEMCOT™
  • Polyester knit wiper
  • Staple-fiber rayon/polyester nonwoven wiper
  • Papar wiper(wood-pulp)

Low microparticles

Microparticles
[Airborne microparticles]Particles generated in the air(0.3μm or larger)
[Liquid microparticles]Particles generated in liquid(0.1μm or larger)

Microparticle comparison

Test Method :
IES-RP-CCOO4.2 section 5.2 (Bixal shake test)

Graph:Liquid microparticle

Category of Dry and Wet microparticles

Airborne microparticles only take up a small part of liquid microparticles.

Composites of liquid microparticle
More than half of the wet microparticles are inorganic substances such as aluminum and silicon, though organic substances are also present.
Composites of airborne microparticles
Organic substances in the wiper's body; e.g., cellulose,polyester.

[Liquid microparticle] [Airborne microparticles]

Problems of airborne microparticles test

Airborne microparticles can be measured comparatively easily by using a tumbler (photo) or particle counter, which are commercially available. These methods, however, pose many problems.

Static-charge buildup by
synthetic-fiber wipers
Electrostatic retention of
microparticles in wipers
Impact absorption
by soft wipers
Low physical stress in wipers,reducing microparticle generation and resulting in low count

Only a part of the airborne microparticles
among all those actually generated is measured.

Image:Tumbler
Tumbler
This rotates a wiper in the SUS tube and measures the particles generated in the air.

Importance of liquid microparticles

It is more important to evaluate particles with wet condition since wipers are normally used in wet conditions such as with solvent absorbed or for wiping liquid.

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Characteristics of BEMCOT

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