Operation and Calibration of Bursting Strength Tester

1. Objective

To lay down a procedure for operation and calibration of Bursting Strength Tester. It is used to determine the Bursting Strength of C-box, Carton etc.

• Scope

This SOP is applicable for operation and calibration of Bursting Strength Tester (Make: LINUX, Model:  DH-826)  in Quality Control.

• Responsibility

QC Chemist / Officer : To follow the procedure and maintain record as applicable.           

• Accountability

Head Quality Control  :  For System Compliance

• Procedure:  
  • Operation:
    • Ensure that equipment is clean.
    • Check the calibration due date.
    • Switch on the mains.
    • To ON the machine turn the indicator switch to ON position. The indicator will glow.
    • Select the head for testing by turning the selector switch either on gaze 1 (for measuring the BS of c-box) or gaze 2 (for measuring the BS of carton, label, paper etc.).
    • Turn the clamping wheel in anticlock wise direction.
    • Take sample to be tested and place it over the diaphragm plate. Clamp the sample by applying adequate pressure by clockwise turn of wheel.
    • Bring the lazy hand (red knob of the gauze) to zero position.
    • Press the “Push for Burst” button and keep it pressed till the sample bursts.
    • Read the value from the gauze in kg/cm² and record.
    • Bring the lazy hand (red knob of the gauze) to zero position.
    • Enter the details in Instrument log.
    • Replacement of Diaphragm:
      • Switch the mains ‘ON’. Select the Head through the selector switch. The piston retracts back to its starting position if not already there.
      • Turn the clamping wheel to have equivalent clamping pressure from triclamp to the diaphragm plate.
      • Loosen the diaphragm nut by anti clockwise rotation with clamp spanner supplied with this machine.
      • Remove the clamp pressure by raising the triclamp. Remove the diaphragm nut, diaphragm plate and the rubber diaphragm from its seating.
      • Remove the diaphragm nut, diaphragm plate and the rubber diaphragm from its seating.
      • Check the level of the fluid. Fill if less to form a slight meniscus. Place the flat side of the diaphragm on the seat by sliding movement covering the liquid to prevent any air trap inside the system.
      • Place the diaphragm plate carefully without displacing the diaphragm; Hold finder tight the diaphragm nut over the diaphragm plate.
      • Place the diaphragm plate carefully without displacing the diaphragm.
      • Hold finger tight the diaphragm nut over the diaphragm plate.
      • Lower the tripod to clamp the diaphragm plate.
      • Turn the diaphragm nut and then apply further pressure from the tripod.
      • Tighten the nut further.
      • Repeat this procedure till optimum tightening of the nut and the plate is achieved.
      • Make a few burst on paper / board to relieve the surface tension of the diaphragm.
      • Replace the diaphragm after approx. 1000 testing or damage.
    • In case any problem observed inform to service engineer.
  • Calibration:
    • Operate the equipment as per point no. 5.1.
    • Measure the bursting strength of calibration aluminium foil Board Type 11.8 kg/cm² on Gauge 1 and record the value on annexure I.
    • Measure the bursting strength of calibration aluminium foil paper Type 3.2 kg/cm² on Gauge 2 and record the value on annexure I.
    • Acceptance criteria:

S. No.	Standard Sample	Standard Bursting Strength	Limit
1.	Calibration aluminum foil Broad Type 11.8 kg/cm2 for Gauge 1	11.8 kg/cm2	± 0.3 kg/cm2
2.	Calibration aluminum foil paper Type 3.2 kg/cm2 for Gauge 2	3.2 kg/cm2	± 0.2 kg/cm2

• Enter the details in Annexure I.
  • Prepare the calibration tag and affix it on the equipment.
  • Enclose the old calibration tag with the record and don’t throw it.
  • If the variation is not within the specified tolerance limits:
    • Label the equipment with a tag, “OUT OF CALIBRATION”.
    • Inform the Department Head.
    • Do not use equipment until all errors are rectified. After rectification, again calibrate the equipment & record the observation.
  • Frequency: 6 Months ± 3 days.
• Annexure (S)

NA

• Reference (S)

Manufacturer manual

• Glossary

SOP                 :           Standard Operating Procedure

QA                   :           Quality Assurance

QC                  :           Quality Control

Kg                    :           Kilogram

cm                   :           Centimeter

• Revision History

Rev. No.	Details of changes	Reason for change