Paper Testing Equipments

This is an equipment to evaluate the Print Quality / Rub proofness of prints on a substrate.

Good Print Quality is a perfect combination of Good Ink + Good Substrate + Good Process + Good Drying. If any of the above factors go wrong, the result can be disastrous.

The most commonly used method to evaluate print quality is by rubbing 2 printed surfaces against each other. However if this is done manually, the amount of pressure applied during rubbing cannot be quantified and kept constant. Moreover it is difficult to keep the plane of contact constant and keep a track of the number of rubs. Hence making this method highly Operator Dependent.

The Sutherland Rub Tester or the Patra Rub Tester overcomes this by rubbing 2 printed surfaces against each other (face-to-face) in the same plane, at a constant pre-determined speed, under a constant rubbing pressure.

This equipment can also be used to evaluate color transfer from printed / coated surfaces during rubbing.

This equipment confirms to international specifications of TAPPI – T-830 / ASTM D-5264-92 and PATRA / PIRA / BS - 3110.

Models available :

Various digital models with non-contact type rub counters, Auto-stop facilities, Speed Indicators, etc.

This equipment is relevant to :

1. Printing / Processing / Converting houses.
2. Heavy End-Users of printed material.
3. Ink Manufacturers
4. Research Institutions.
5. Packaging Development centers.

This is an equipment to test paper tubes / cores & cones for:

1. Radial Compression / Crush.
2. Flat Horizontal Compression / Crush.
3. Flat Vertical Compression / Crush.

Significance :

Paper tubes, bobbins & cones are used as yarn carriers while paper cores are generally used for paper & plastic film reels.

If the core / cone is being used as Packaging Media, then Flat Crush is considered relevant. If however the core / cone is being used as a carrier or winding medium, then Flat Crush is irrelevant. When used as a winding media, the forces acting on the carrier act radially inwards and hence the performance of the carrier can be predicted suitably only by the Radial Crush method.

It is designed in such a manner that gradually increasing force is generated & applied on 66% of the surface of the carrier.

The sharp collapsing point can be easily detected and a suitable reading can be taken.

The collapsing force, which the carriers are capable of resisting, is dependent upon the following factors:

1. Quality of paper.
2. Quantity of paper.
3. Quality of adhesive.
4. Manufacturing process.
5. Moisture content in the carrier.
6. 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.

Salient features :

1. Machine designed on proven principle of pneumatics.
2. Easy and safe to operate.
3. Skilled manpower is not required.
4. Zero maintenance machine.
5. Provides in - house quality control system at affordable price.
6. Highest degree of consistency and reliability.

Capacities Available :

300 Kgf, 500 Kgf, 1000 Kgf, 1200 Kgf and 2000 Kgf.

Models available :

Various models starting from Economy Analog models to the high-end Fully Automatic Computerized models.

This equipment is relevant to :

1. Core / Cone Manufacturers.
2. End-Users of Paper Cores / Cones.