SBS - The best value in QMS software

Weighing plastic part to evaluate moulding process

L

Led_honda

#1
Hi all, :D

Just a quick question.:confused:
Is it possible to weight a plastic component after molding to determine if the quality is good, ie if it has voids, over packed, under packed.

If we know a good part weighed X, shouldn't all parts weigh the same if the process is in control ??

If someone has used this process before or know where i can gain more information it would be great. What variation would be acceptable.:thanx:
 
Elsmar Forum Sponsor

Kales Veggie

People: The Vital Few
#2
That depends on a lot of things (material variation, humidity level for example).

In general, yes, you can find large voids, short shots. If you process is in control, you will not find any defects, so then it is a waste of resources.

You could start with weighing each part after molding and determine the process capability and variation.
 
L

Led_honda

#3
That depends on a lot of things (material variation, humidity level for example).

In general, yes, you can find large voids, short shots. If you process is in control, you will not find any defects, so then it is a waste of resources.

You could start with weighing each part after molding and determine the process capability and variation.

What level of variation would you expect. Would humidity level affect the part weight ? Say the a good part weighs 75.25 grams
 
Thread starter Similar threads Forum Replies Date
J Weighing Balance Accuracy for Plastic Moulded Parts variation study Manufacturing and Related Processes 3
WEAVER Electronic Weighing Scale Calibration Tolerance Manufacturing and Related Processes 1
S Is a GR&R necessary for Weighing Scale? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 7
R Fixing of tolerance limit - Electronic weighing balance with the capacity of 150 Kgs General Measurement Device and Calibration Topics 5
Q Weighing Dietary Supplement Powder during manufacturing US Food and Drug Administration (FDA) 2
P Has anyone ever heard of the Eastern Weighing and Inspection Bureau? Calibration and Metrology Software and Hardware 1
L Is calibration required for weighing scales used for shipping purposes ? Misc. Quality Assurance and Business Systems Related Topics 10
D Verification of weighing scale 150kg capacity 0.05g accuracy General Measurement Device and Calibration Topics 9
R Error in Master Weighing Stone General Measurement Device and Calibration Topics 2
W Weighing Scale used in Phamaceutical Production - Daily Verification Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 8
W Is a Non-Automatic Weighing Instrument a Medical Device? IEC 60601 - Medical Electrical Equipment Safety Standards Series 1
D How to Compute the Accuracy Class for a Weighing Scale? General Measurement Device and Calibration Topics 4
D How to compute the Permissible Errors for Class 2 Weighing Scale General Measurement Device and Calibration Topics 2
V Is MSA (Measurement System Analysis) required for Weighing Scale? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
K Justifying an Analogue Weighing Scale for Compounding Industry Measurement Uncertainty (MU) 6
S Weighing Scale MSA (Measurement System Analysis) Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
D Please help to set Weighing Indicator SI4010R General Measurement Device and Calibration Topics 1
R Primary Weighing Stone - M1 Accuracy Class - Clarification required General Measurement Device and Calibration Topics 7
Q Weighing (Weight) Scales Verification - Blank weight of material General Measurement Device and Calibration Topics 13
F Weighing Instrument Calibration Laboratory - Difficulties in Implementing a QMS? General Measurement Device and Calibration Topics 9
M Weighing scales to be used at each machine on the shop floor Manufacturing and Related Processes 6
E Determining Weighing / Counting Scale Tolerance - No manufacturer specification General Measurement Device and Calibration Topics 24
D Measurables for Plastic Injection molding process Manufacturing and Related Processes 1
D Continuous Improvement Plan - Plastic injection molding IATF 16949 - Automotive Quality Systems Standard 1
Z Rapid audit template for plastic parts manufacturing process Manufacturing and Related Processes 12
D IMDS for Like Components (Interior Plastic, Leather/vinyl Armrest, etc.)other than Color APQP and PPAP 1
A Help establishing regulatory requirements - Plastic dental cartridge syringe US Food and Drug Administration (FDA) 0
C ABS plastic : which IEC 60601-1 tests to redo? IEC 60601 - Medical Electrical Equipment Safety Standards Series 6
A Glass and brittle plastic Policy - Required per FSSC 220002-4? Food Safety - ISO 22000, HACCP (21 CFR 120) 0
Nicole Desouza Plastic Extrusion of Medical Device Components - No ISO or AS 9100 Certifications Other Medical Device and Orthopedic Related Topics 7
Nicole Desouza AS9100D - Calibration of Dies & Tooling - Plastic Extrusion AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 4
Fernando Drumond Calibration and Control of Plastic Volumetric Measurement Instruments General Measurement Device and Calibration Topics 1
erozas2003 Color test on molded plastic parts Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
Z CQI-15 Welding System Assessment - Robotic Ultrasonic Foam onto Plastic "Weld" applicable? Various Other Specifications, Standards, and related Requirements 3
M Informational 2019 Meeting Materials of the General and Plastic Surgery Devices Panel Medical Device and FDA Regulations and Standards News 0
M Informational The USFDA Announces General and Plastic Surgery Devices Panel of the Medical Devices Advisory Committee Meeting on March 25-26, 2019 Medical Device and FDA Regulations and Standards News 0
J Looking for FMEA plastic injection molding FMEA and Control Plans 8
John Broomfield Cleaning plastic from our oceans - The Ocean Cleanup Venture Sustainability, Green Initiatives and Ecology 33
Y How to fix weight tolerance for plastic injection molded part? Does it vary with material groups? Manufacturing and Related Processes 1
A Cleaning plastic parts for sterilized medical devices ISO 13485:2016 - Medical Device Quality Management Systems 15
smryan Chemistry and physics of plastic behavior - Any plastics experts in the house? Coffee Break and Water Cooler Discussions 1
K Sampling Plan for transparent tubular plastic parts from 32 different cavities Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
L I need an example rework procedure/instruction for injected plastic parts Document Control Systems, Procedures, Forms and Templates 2
J Finishes on Plastic Molded Parts Manufacturing and Related Processes 9
D Hot Plate Welded Plastic Strength Validation Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
K Testing Large Plastic Pipe Imported Legacy Blogs 0
L Product Requalification for Plastic Injected Parts APQP and PPAP 3
A Plastic Injection Molding Process Troubleshooting Guide Manufacturing and Related Processes 1
T Customer Requirement for Sorting - Visual Defect on Plastic Part IATF 16949 - Automotive Quality Systems Standard 9
M How to fix a plastic bag on leg with a bandage to take a shower Coffee Break and Water Cooler Discussions 15

Similar threads

Top Bottom