The Elsmar Cove Business Standards Discussion Forums More Free Files Forum Discussion Thread Post Attachments Listing Elsmar Cove Discussion Forums Main Page
Welcome to what was The Original Cayman Cove Forums!
This thread is carried over and continued in the Current Elsmar Cove Forums

Search the Elsmar Cove!

Wooden Line
This is a "Frozen" Legacy Forum.
Most links on this page do NOT work.
Discussions since 2001 are HERE

Owl Line
The New Elsmar Cove Forums   The New Elsmar Cove Forums
  Statistical Techniques and 6 Sigma
  SPC/Sampling on Bulk Material (Continuous Nonwoven process - total weight)

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   SPC/Sampling on Bulk Material (Continuous Nonwoven process - total weight)
FGrace
Lurker (<10 Posts)

Posts: 1
From:North Dighton, MA, USA
Registered: Jul 2000

posted 19 July 2000 08:54 AM     Click Here to See the Profile for FGrace   Click Here to Email FGrace     Edit/Delete Message   Reply w/Quote
I have heard that there has been some debate regarding the validity of SPC
data taken on a bulk material process. Has anyone heard anything about
this?
Also, Does anyone out there have a method for performing SPC on a textile
process such as adhesive coating a nonwoven and monitoring the total weight
of the product? I am currently taking sample across the width from a yard
taken off each roll produced and then using the average for the X-bar and
Range. I do not think that this would be considered a statistically valid sampling plan. Our roll size is 1,000 linear yards per roll.
Any help would be really great.

Thank you,
Frank C. Grace

IP: Logged

Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 16 August 2000 07:01 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Also see https://elsmar.com/ubb/Forum10/HTML/000035.html

IP: Logged

Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 16 August 2000 07:04 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
From: "David J. Mulholland" mulholdj@home.com
Newsgroups: misc.industry.quality
Subject: Re: SPC of Bulk Material (Continous Textile Process) QS and ISO 9000
Date: Wed, 16 Aug 2000 02:50:13 GMT
X-Complaints-To: abuse@home.net
X-Trace: news1.rdc1.va.home.com 966394213 24.6.191.29 (Tue, 15 Aug 2000 19:50:13 PDT)

Frank,

Donald Wheeler, in one or more of his SPC press books gives a method...book title escapes me at the moment. It is listed under chemical industry topics, I think. Anyway, here is the summary:

1. Use XBar-R for tracking "within batch" variation.
2. Use X-MR (subgroup of 2) for tracking "between batch" variation.

I am doing this now for "Product" (vice Process) Control Charts on incoming materials plotting several tests (including weight in Oz/YD^2) on laminated and coated fabrics for helium filled vehicles and it meets my needs for process monitoring of my supplier.

I am using a sample size of 5...stratified random sampling where the 5 are drawn on different warp and fill yarns across the web of the fabric at one or both extreme ends of the finished roll. We have chosen each roll (100 to 800 yards) as the sampling interval, and every roll in each lot is tested.

Hope this helps. E-mail if you want to see a chart.

Dave Mulholland mulholdj@home.net

"FrankCGrace" wrote in message
news:u4Qb5.24885$Q8.184729@typhoon.ne.mediaone.net...
> I have heard that there has been some debate regarding the validity of SPC
> data taken on a bulk material process. Has anyone heard anything about
> this?
>
> Also, Does anyone out there have a method for performing SPC on a textile
> process such as adhesive coating a nonwoven and monitoring the total weight
> of the product? I am currently taking sample across the width from a yard
> taken off each roll produced and then using the average for the X-bar and
> Range. Any help would be really great.
>
> Thank you,
> Frank C. Grace
> fbgrace@mediaone.net

IP: Logged

All times are Eastern Standard Time (USA)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply Hop to:

Contact Us | The Elsmar Cove Home Page

Your Input Into These Forums Is Appreciated! Thanks!


Main Site Search
Y'All Come Back Now, Ya Hear?
Powered by FreeBSD!Made With A Mac!Powered by Apache!