This document describes the Core Compression Model #P500/1000D, a machine used to test the collapsing strength of paper tubes, bobbins, and cores. It directly measures the collapsing force without requiring calculations. The collapsing strength depends on factors like the quality and quantity of paper and adhesive used, the manufacturing process, and moisture content. The machine applies gradually increasing force to the carrier and easily detects the sharp collapsing point using a loadcell and digital indicator. It can perform radial, flat, or vertical crush tests depending on the intended use of the paper tube or core.

1. Core Compression
Model # P500/1000D
Core Compression Tester
Paper tubes and bobbins are used as yarn carriers while paper cores are generally used for paper & plastic film
The collapsing force, which the carriers are capable of resisting, is dependent upon the following factors:
- Quality and Quantity of paper
- Quality and Quantity of adhesive
- Manufacturing process
- Moisture content in the carrier
- Physical size and dimensions
It is very difficult for a user to know all the above factors
and their influence on the strength of the carrier. It is
equally difficult for a manufacturer to know the effect of
each variable quantitatively.
But it is very easy for both the user and manufacturer to
differentiate between good and bad and adopt a suitable
standard of monitoring the quality of the carrier.
Collapsing strength tester is designed in such a manner that
gradually increasing force is generated & applied on the
surface of the carriers. The sharp collapsing point can be
easily detected with the help of a Loadcell and
Microprocessor based digital indicator.
Since this machine directly measure the collapsing force, no calculations are required and hence, the readings
are direct and most accurate.
For Paper Tubes / Cores used as Winding Medium / Carrier, Radial Crush Test is performed.
For Paper Tubes / Cores used as Packing Material, Flat Crush Test and Vertical Crush Test can be performed.
Technical Specifications / Salient Features :
- Electro pneumatic system (Maintenance free)
- Digital Model with Backlit LCD Display for easy readibility
- Direct Display of Load / Collapsing Force. No Calculations Required.
- Auto-stop and auto-return upon completion of Test.
- All operations from embedded push buttons on Indicator panel.
- Capacity : 500/1000 Kgf at 6 Kg/cm2.
- Least Count / Resolution : 0.5 / 1 Kgf
- Accuracy : 0.2% of Full Scale.
Utilites Required :
- Power Supply : 110 / 220V, 50/60 Hz, 5 Amp
- Compressed Air : 6 kg/cm2
- 100 Kg Cast Iron weights (For calibration)