cleanroom garment - bcw · 2017-09-24 · cleanroom garment contamination source ... carsten...

Cleanroom Garment

Contamination Source

“Human”

or how efficient is

Cleanroom Garment

Different aspects around the theme „Cleanroom Garment“

Cleanroom Garment

Carsten Moschner © Dastex Reinraumzubehör GmbH & Co. KG

Speaker: Carsten Moschner

since 1992 active in the segment „Cleanrooms“,et al. in the area Cleanroom Garments

Managing Director of Dastex Reinraumzubehör GmbH & Co. KG

Chairman of the committee of experts inside VDI for the guidelines “cleanroom consumables” (no. 2083 part 9.2) which is available since end of 2016 (garments, gloves, wipers etc.)

Author of different professional articles and chapters in books about cleanroom garments

Reinraumbekleidung


Summary &

Conclusion

General

Body-Box Testincl. a

live Demo

Cleanroom-suitable

Undergarment

Cleanroom Garment

Cleanroom Garment:

Protection against contamination

released by the wearer

Personal Protection Equipment (PPE):

the wearer has to be protected against

contamination coming from the process

or environment


Cleanroom Garment


The main job of the cleanroom garment is,to protect the product or the processagainst contamination released by humansand their private garment.

[VDI 2083, Blatt 9.2]

Cleanroom Garment


In this case the cleanroom garment does notbecome a particle source by itself. (Not becauseof aging effects – not because of worse productfeatures.)

In general cleanroom garment can be comparedwith a “filter” � you have to handle it like a filter,you have take care like a filter and if necessaryyou have to change “the filter”.

Cleanroom Garment


The cleanroom garment are to be understood as a

system where the single parameters can

interact.

care

material properties

environmental conditions

Special workplace

conditionsundergarment

Cleanroom Garment


Body – Box – Test (our own test facility „in house“ Dastex)

Measurement points are in back air

Cleanroom: ISO 3/ISO 4

Dimensions: 1200 x 1200 x 2400 mm(basic)

Body Box Test

nach

IEST-RP-CC-003.4

Cleanroom Garment

Carsten Moschner ©

Dastex Reinraumzubehör GmbH & Co. KG

FFU / H14

2 Particle Counter

á 28l (1 ft³)

connected to a computer

to transfer the measurement

results incl. the analyses of

the results

Temp. and Humanity.-Sensor

Air Speed:

between 0,33

and 0,45 m/s

Without a person

inside the Body Box

we will reach a cleanliness level

ISO-3 / ISO 4 after 30 min


Cleanroom Garment

Carsten Moschner ©



Cleanroom Garment



a typical test:

the person enters the „Body-Box“ with different garment systems

and

has to do defined movements in defined time frames

Cleanroom Garment



The most important points are during a study “comparing different garment systems in a Body-Box”

You can compare only results from the

same persons

• Because every person does release different numbers of particles

Stabile conditions (humanity, temperature etc.)

• If the temperature is higher the person feels more unhealthy and will release more particle

Enough repeats (to reproduce results)

• Because the measurement results differs very strong – the risk automatically increase to misinterpret these results (based on less repeats)

Cleanroom Garment



General questions:

a) How many particles release a person under „normal conditions“?

b) How may particles does a person release in different cleanroom garments?

This was a „goal“ of a study

„in house“ in our own test facility

Cleanroom Garment


Contamination Source: “Human”

Numbers of released particles per minute; „persons warring different garment systems“ in relation to their grade of movement

Cleanroom Garment



Garment

standing walking standing walking standing walking

≥ 0,5 µm ≥ 0,5 µm ≥ 1 µm ≥ 1 µm ≥ 5 µm ≥ 5 µm

Cotton-

Jogging-Suit873.304 34.955.780 657.312 25.114.780 17.077 448.638

Coat 331.742 6.304.946 130.901 2.506.4

95

9.795 101.172

Coverall 28.827 106.328 10.396 32.135 331 851

Numbers of released particles per minute; „persons warring different garment systems“ in relation to their grade of movement

Cleanroom Garment


„particle trail“ behind a person

TURBULENTair flow(stirring)

Cleanroom Garment



and how does it look like with germs and bacteria?

- in relation to the garment- in relation to the movement - airborne

This was the goal of another study,performed in our own Body-Box,2014, with a new measurement equipment

Cleanroom Garment


Numbers of released germs per minute„Person in different “garment systems“ in relation to the movement

Cleanroom Garment



Measurements with BioTrak from TSI – in a controlled area

Cleanroom Garment


≥ 1 µm

standing walking

garment particles germs particles germs

coverall 5.350 18 93.125 263

coat 183.672 623 3.560.002 12.492

jogging suit 571.364 1.379 8.430.884 17.887

≥ 5 µm

standing walking


coverall 107 2 1.547 36

coat 8.426 373 174.650 6.472

jogging suit 30.659 757 456.802 9.364

≥ 10 µm

standing walking


coverall 17 2 132 10

coat 1.344 86 25.879 4.845

jogging suit 5.839 557 76.980 7.364

reduction – particles: 1,10 %reduction - germs: 1,47%

reduction - particles: 0,34 %reduction - germs: 0,39%

reduction - particles: 0,17 %reduction - germs: 0,14%

Numbers of released germs per minute

„Person in different “garment systems“ in relation to the movement

Cleanroom Garment


Detection method used by the Bio Trak counter

Supported by photomultiplier

Spectroscopy= physical method� the weave length of the lightwill be modified � fluorescence

scattered light

Fluorescence AFluorescence B

Cleanroom Garment


Detection method used by the Bio Trak counter

Ex

cit

ati

on

wa

ve

le

ng

th

emission wave length

Laser Induced Fluorescence (LIF)

Viable cell metabolites tryptophan, NADH, and flavin’s

(riboflavin) fluoresce when excited by ultra-violet light

Cleanroom Garment



Beside of studies „How many particles does a human release“

you can use the Body Box for example:

As a test facility to control complete garment systems and to

optimize such a system, to compare different system, or to

optimize components of a system

For example: is a complete closed fabric useful? Maybe

through other leaks particles can leave the system garment

and are a high potential risk for the product?

the so called: “Pump Effect”

Cleanroom Garment



During different studies it was

proofed, that fabrics with a very

low air permeability release

through other „openings“ much

more contamination, than fabrics

with a middle range air

permeability!

product / process

Cleanroom Garment


Qualitative

representation of the

local particle emission

of a person wearing

conventional cleanroom

garments

Collar area + the part above the facemask – boosted by the „pump effect“

Contamination by breath, in connection to the fit , material and the wearing time of the mask;a big part of the contamination are particles which „pass around“ the mask!

Migration procedures (by friction) + diffusion (air born) through the fabric

Migration procedures (most mechanical stressed area) + zipper

Particle emission from/through the seams

Arm cuffs – boosted by the „pump effect“+ but also from the knitted material added particle release, because the decontamination of the knitted material is much inferior than cleanroom fabric

Cleanroom Garment


cleanroom suitable undergarmenta major part of the garment system

In the system „Cleanroom Garment“ in many

times end user pay no or only a little attention

to the undergarment (in the most cases normal

street wear), although a huge share of

contamination will be generated by this source

of pollution.

With the help of a defined undergarment it is

easily possible to reduce particles and germs in

the system cleanroom garments.

� At least: 50% !

.

Cleanroom Garment


study / investigation� subject:particle/ germ releaseby humans with

different undergarment


Cleanroom Garment



0

50

100

150

200

250

Pers. A Pers. B Pers. A Pers. B Pers. A Pers. B

cfu

per

100 c

m²

Influence of the undergarment on the microbiologicalcontamination of cleanroom garments

Cotton

Light Tech

directly after having having made simulation of

dressed the 1. time several exercises repeated wears

Cleanroom Garment



0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

> 0,3 µm > 0,5 µm > 1 µm

Cotton, 1. Set, Neck-Level

Light Tech, 1. Set, Neck-Level

Cotton, 1. Set, Working-Level

Light Tech, 1. Set,Working-Level

Influence of the undergarment on the contamination of the cleanroom air

Cleanroom Garment



Garment

standing walking standing walking stand. walk.

≥ 0,5 µm ≥ 0,5 µm ≥ 1 µm ≥ 1 µm ≥ 5 µm ≥ 5 µm

Cotton-Garment 873.304 34.955.780 657.312 25.114.780 17.077 448.638

Coat 331.742 6.304.946 130.901 2.506.495 9.795 101.172

Coverall 28.827 106.328 10.396 32.135 331 851

Coverall +

Undergarment< 14.000 < 50.000 < 5.000 < 16.000 < 150 < 400

Cleanroom Garment


Body – Box – Test (other studies done in our test facility)

Comparing different garment systems

like e.g. disposable garments

vs. washable cleanroom

garment

Cleanroom Garment


Body – Box – Test / Study „disposable - vs. washable cleanroom garment“

0

100

200

300

400

500

600

700

800

900

material material 1 material material material CR-Fabric CR-Fabric1 laundered 2 3 4 laundered

during walking

No movement

(pa

rtic

les≥ 0

,5 µ

m )

x 1

.00

0

Cleanroom Garment



results:

- only pre-laundered disposable garment are recommended to use as standard cleanroom garment

(� but the costs will be much higher)

- between the different basic materials for disposable garments are huge differences in particle shedding / in particle release

- reusable cleanroom garments has to be laundered before they will be used the first time in the cleanroom

Cleanroom Garment



0

100

200

300

400

500

600

700

800

900

material material 1 material material material CR-Fabric CR-Fabric1 laundered 2 3 4 laundered

during walking

No movement

(pa

rtic

les≥ 0

,5 µ

m )

x 1

.00

0

Garments, directly from the production � means NOT

laundered

Cleanroom Garment



Disposable garments are produced in non controlled areas without any protection against any contamination

Cleanroom Garment

Carsten Moschner ©


The real numbers of particleshow to calculate the factor:

The problem:We get much more “clean air” through the FFU into the Body Box than a typical particle counter can convert.

Approx. 2000 m³/h (through the FFU � 3,36 m³/h (a particlecounter can collect)

Cleanroom Garment


The real numbers of particleshow to calculate the factor:

width b 1,2 m

length t 1,2 m

surface A = b x t 1,44 m2

Airflow/airspeed w 0,4 m / s

Quantity of air Vo = A x w x 3600 2073,6 m3 / h

Quantity of air per minute Vo min = Vo : 60

34,56 m3 / min

the volume the particle counter is working VoP

28 l / min

these volume in m3

VoP m3 = VoP : 10000,028 m3 / min

factor F = Vo min : VoP m3 1.212

Cleanroom Garment

Let´s have a look forthe results today, transmitted from Muggensturm?


Cleanroom Garment

Carsten Moschner ©


summary

The Body Box Test, is still the only actual existing test method to answer questions like:

� does “my” cleanroom garment system work?� how effective is my cleanroom garment system?� does it make sense to change parts of my cleanroom

garment system?� is the cleanroom garment system A better than B

Body – Box – Test (other studies done in our test facility)

Cleanroom Garment


Cleanroom garment as a system

A cleanroom garment system includes beside of

coveralls , hoods etc. also:

Cleanroom Garment


Cleanroom Garment System

Textile characteristics

Process requirements

Wearerissueses

Concept for the changing area

Cleanroom Garment

Dastex Reinraumzubehör GmbH & Co. KGDraisstrasse 23

76461 Muggensturm

Tel.: +49 (0)7222 9696 60e-mail: [email protected]

internet: www.dastex.com

Carsten Moschner

Thank You

cleanroom garment - bcw · 2017-09-24 · cleanroom garment contamination source ... carsten...

Documents