Characteristics

Low particle generation

check the video

Low fallen fibersWe divide particles into the following categories

Particles

  • Fallen fibersFallen particles 100μm or larger and visible to the human eye
  • Micro particlesThat are not visible, but can be measured by a particle counter(0.1μm or larger)

Fallen fibers comparison

Wipes 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

Fallen fibers comparison graph

Comparison of fallen fibers performance by each testing method

General cellulose nonwoven wipes 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

Wipes 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
BEMCOT
Polyester knit wiper
Polyester
knit wiper
Staple-fiber rayon/polyester nonwoven wiper
Staple-fiber rayon/
polyester nonwoven wiper
Papar wiper(wood-pulp)
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 wipes is compared after wiping.(Load: 22.2 g/m2; Speed: 1.0 m/min1; Distance: 40 cm)
Test Method : Asahi Kasei Method

BEMCOT
BEMCOT

Wiping with a fixed load and at a fixed speed

BEMCOT

Almost no fluffing and single yarn damage is observed the surface

BEMCOT
 
Polyester knit wiper
Polyester knit wiper

Wiping with a fixed load and at a fixed speed

Polyester knit wiper

The knitting structure is broken by friction.Fluffing and single yarn damage is observed.

Polyester knit wiper
 
Staple-fiber rayon/
polyester nonwoven wiper
Staple-fiber rayon/ polyester nonwoven wiper

Wiping with a fixed load and at a fixed speed

Staple-fiber rayon/ polyester nonwoven wiper

Major fluffing is caused by friction.Single yarns are cut and damaged.

Staple-fiber rayon/ polyester nonwoven wiper
 

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
BEMCOT
Polyester knit wiper
Polyester
knit wiper
Staple-fiber rayon/polyester nonwoven wiper
Staple-fiber rayon/
polyester nonwoven wiper
Papar wiper
Papar wiper
(wood-pulp)
 
Low microparticles

Microparticles

  • Airborne microparticlesParticles generated in the air(0.3μm or larger)
  • Liquid microparticlesParticles generated in liquid(0.1μm or larger)

Microparticle comparison

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

Liquid microparticle

Category of Dry and Wet microparticles

Category of Dry and Wet microparticles

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

Composites of liquid microparticle

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

Composites of airborne microparticles

Organic substances in the wiper’s body; e.g., cellulose,polyester.

Category of Dry and Wet 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 wipes

Electrostatic retention of
microparticles in wipes

Impact absorption
by soft wipes

Low physical stress in wipes,reducing
microparticle generation and resulting in low count

Only a part of the airborne microparticles
among all those actually generated is measured.
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 wipes are normally used in wet conditions such as with solvent absorbed or for wiping liquid.

Importance of liquid microparticles