Paper Core Compression Tester
Radial Crush Test Adopter : These are curved adopters which match the exact external contour of the Paper Core. Hence every specific OD of core to be tested needed a dedicated Test Adopter. These adopters have a tolerance of +/- 1mm only. Hence correct adopter selection is critical. Radial Crush Adopters are available only for Cores having OD in the range of 80 - 200mm OD only.
Standards: Proprietary PACKTEST Standards
Lead Time : 4-6 weeks
Core Compression Tester (Pneumatic Model)
Paper Cores are generally used for winding sheet material such as paper / plastic film / foil / textiles.
Material is usually wound on the paper cores with a little tension or stretch. The paper cores are expected to withstand the stress caused due to the winding tension of the material they carry.
Depending upon the nature of the material and the effect of the environment (change in moisture and/or temperature), the material may contract / shrink over time. This compounds the effect of the original winding tension on the paper core.
These forces are always acting radially inwards on the paper core, trying to push the walls towards the center.
If the paper core is unable to withstand the original winding tension or the increased stress due to material shrinkage, it will collapse inwards. This can make the material unusable in many cases. Or at least prevent mounting the paper core on the mandrel / chuck of the un-winder.
Sometime the winding tension may not be very high and the shrinkage may also be negligible, but during handling (or mis-handling) the roll may accidentally drop on the floor, causing the shape of the core to change from round to oval. Again chances of material damage and issues with the un-winder.
The strength (resistance to collapsing) of the paper cores depends upon:
- Quality and Quantity of paper
- Quality and Quantity of adhesive
- Manufacturing process
- Moisture content
- Physical size and dimensions
It is very difficult for a user (paper core buyer) to know all the above factors and their influence on the strength of the paper core. It is equally difficult for even a core manufacturer to know the effect of each variable quantitatively.
But by using the Core Compression Tester (also known as Collapsing Strength Tester or CS Tester), it is very easy for both the paper core manufacturer and paper core user to differentiate between a good or bad core and adopt a suitable standard of monitoring the quality of the same.
Types of Test :
Flat Crush Test :
This is the original method, wherein the paper core is pressed between 2 flat plates and the maximum force required to deform the core is recorded.
This method is great if the winding tension and / or material shrinkage is low, and the paper cores are only getting damaged by accidental drops to the floor. Or if the paper core is used as a container, where the product is packed inside the core and not wound on the outer surface. Eg. Submersible pumps are packed inside paper cores and hence Flat Crush is a better test for these cores.
Radial Crush Test :
This method was invented by our founder in 1987.
It uses special test fixtures (called as adopters) to hold the paper core between 2 curved adopters while being pressed.
The profile of the adopter is such that it matches the contour of the paper core, supporting 33% of the core’s outer surface from the bottom and 33% from the top. This allows only the remaining 16.5% on either side to bulge and collapse.
This method is seen to better predict the quality of the paper cores.
Studies / Trials conducted by us showed that 2 paper cores having very similar Flat Crush Test values can still give significantly different Radial Crush Test values, and the cores which had a better Radial Crush Test value, did perform better in the real world.
Comparison of Flat Crush Test vs Radial Crush Test
Description
Flat Crush Test
Radial Crush Test
Adopters
Since this test uses only 2 flat plates, only 1 adopter set is needed for all core sizes
Since this test needs adopters profiled as per the outer surface of the paper core, it needs dedicated adopter sets for every different Core ID and Thickness combination.
Cost
Flat Crush Test adopters are not expensive.
Since this test uses a single adopter for all sizes, the total cost (of equipment + adopter) is low.
Radial Crush Test adopters are customized and hence 3 – 5 times costlier than Flat.
And since this test uses multiple adopters (for multiple sizes), the total cost can be much higher depending upon the variety of paper cores you need to test.
Suggested for
Paper Cores used as containers or those subjected to low winding tension and low material shrinkage.
Where the damages in field are usually in the form of the paper core changing shape from round to oval.
Paper Cores used as winding medium or those subjected to high winding tension and / or high material shrinkage.
Where the damages in field are usually in the form of the paper core collapsing inwards (towards its center).
Sample Test Length
100 mm
100 mm
Results
Lower than Radial Crush Test.
2-6 times higher than Flat Crush Test.
Technical Specifications of Core Compression Tester
- Digital Model with Backlit LCD Display
- Electro-Pneumatic Model (Runs on Compressed Air)
- Auto-stop & Auto-return upon completion of Test.
- Testing Principle : Constant Rate of Loading (Slow and gradual increase of force till collapse)
- Direct force measurement. No Calculations Required.
- Peak hold facility for registration of maximum compression force.
- Auto-Calibration facility for quick, user-friendly calibration.
- Choice of Measurement units : Kgf / Lbf / N (User settable from Menu)
- Maintenance free design.
- Optional facility to capture test data on to the PC directly through the software and generate PDF test & calibration reports.
Models Available
Model
P1000
P1500
P2000
Capacity :
1000 Kgf
9800 N
2200 Lbf
1500 Kgf
14700 N
3300 Lbf
2000 Kgf
19600 N
4400 Lbf
Working Range :
10 – 100 % of Capacity.
100 – 1000 Kgf
980 – 9800 N
220 – 2200 Lbf
10 – 100 % of Capacity.
150 – 1500 Kgf
1470 – 14700 N
330 – 3300 Lbf
10 – 100 % of Capacity.
200 – 2000 Kgf
1960 – 19600 N
440 – 4400 Lbf
Least Count :
1 Kgf
10 N
2 Lbf
1 Kgf
10 N
2 Lbf
1 Kgf
10 N
2 Lbf
Accuracy :
0.2% of Capacity
20 Kgf
200 N
40 Lbf
0.2% of Capacity
30 Kgf
300 N
60 Lbf
0.2% of Capacity
40 Kgf
400 N
80 Lbf
Calibration Weight Required :
100 Kgs
(20 kg x 5 pcs)
100 Kgs
(20 kg x 5 pcs)
100 Kgs
(20 kg x 5 pcs)
Available Sizes :
Small (S)
Medium (M)
Extra Large (XL)
Small (S)
Medium (M)
Small (S)
Medium (M)
Size Option
Small (S)
Medium (M)
Extra Large (XL)
Suitable for core sizes :
3 inch ID cores only
(max OD 140 mm)
3 – 6 inch ID cores
(max OD 195 mm)
3 – 12 inch ID cores
Flat Crush : max OD 350 mm
Radial Crush : max OD 200 mm
Equipment Placement :
Table Top
Table Top
Floor Standing
Photo :
Included :
- Air Filter + Pressure Regulator.
- RS-232 Data Cable with USB-Serial Convertor are supplied with models / SKUs which have Software (Ending with RS).
Excluded (to be purchased separately) :
- Flat Crush Test Adopter.
- 1 adopter works for all core sizes.
- Radial Crush Test Adopters.
- To be ordered for every specific OD that needs to be tested.
- Calibration Weights (100 Kgs, to be procured locally by buyer)
Software Options :
- No Software (SKUs ending with NS)
- Regular Software (SKUs ending with RS)
Utilities Required :
- Power Supply (Current : Max 5 Amps) :
- For India (Domestic Model) : 230 Volts A.C., 50 Hz. Clean power.
- For Outside India (Export Model) : As per your country’s power rating.
- Calibration weights (100 Kgs)
- Compressed Air @ 6 bar (87 psi) for P1000 and P1500. @ 7 bar (102 psi) for P2000
- Desktop / Laptop PC (Intel Core i3, 4gb RAM, Win10 OS, 1080p Monitor) or higher.
Warranty : 12 Months (Back-to-Bench)
Terms and Conditions
Delivery / Freight Charges
Prices (if mentioned) on our website DO NOT INCLUDE Delivery / Freight Charges.
Domestic (India) customers will have the option of Freight To-Pay / Freight Prepaid.
Export (Outside - India) customer will have the option of Freight Prepaid or their can collect on their own Courier Account with UPS / DHL / FEDEX, etc.
If you want Freight Prepaid, let us know after receiving the quotation. We will add delivery charges and resend the offer.
Product Lead Time
Lead Time mentioned in the description is a tentative timeline for us to dispatch the product. Please consider additional days for transit period by courier / freight agency. This timeline is on "Best Effort" basis.
Sometimes there can be a delay due to unforseen circumstances beyond our normal control. Delays if any will be intimated to you at the time of ordering.
Product Warranty
Unless otherwise specified in the description, all products and accessories (excluding consumables and spares) manufactured / sold by us are covered under a standard 12 month warranty period.
The warranty is "Ex-Factory" or "Back-to-Bench", meaning the product or defective part will have to be sent back to us for repair or replacement. To and Fro Freight / Courier charges are to be borne by the buyer. The warranty only covers manufacturing defects and not misuse or any other damages.