Testing machines for paper materials - Zwick

Catalogue Testing machines for paper materials

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Zw/ck # Roell


	Standard	ISO 2758
	Material	paper
	Zwick-Item-No
	burst tester	070376.01.00*
	test program	069002.54.ff
	for specimens from 100 x 100 mm
	to machines	from zwicki
	Standard	ISO 2759
	Material	corr. board and
		raw paper for corr.
		board, solid board
	Zwick-Item-No
	burst tester	070376.00.00*
	test program	069002.54.ff
	for specimen	from 100 x 100 mm
	to machines	from zwicki
	Zwick-Item-No
	Accessories
	pressure	8096.00.00
	pre-selector

Further, the easy serviceability and the simple membrane monitoring must be pointed out. If a constant volume is pumped into the test chamber without a specimen, the maximum pressure indicates if the membrane is industrial still in good condition or if it has become weak. The time dependant membrane behavior is automatically displayed and stored with the connected PC.

For burst testing of paper materials, there are two standards: ISO 2758 describes tests on paper, ISO 2759 describes the requirements for carton, corrugated board and corrugated base paper. Zwick offers a test instrument for each of these standards and thereby covers the range from paper to heavy corrugated board.

The 2-point bending test

Bending stiffness is very important in the processing of paper and carton. So that processing operations in packaging and filling machines run dependably and without problems, the paper or carton must be flexible within certain limits. During the changing of paper charges, a uniform stiffness characteristic is also required for constant working conditions of a industrial packing machine. The 2-point bending test unit from Zwick/Roell (Fig.17) covers two applications: calculation of bending stiffness and the determination of the folding behavior at an angle of 90°. Zwick's high resolution and exact measurement technology allows for one industrial load cell to cover a wide range of applications.

When testing fine paper at 15 mm bending length, the forces may be below the lower measuring limit. In such cases, bending lengths from 1 mm should be applicable. Zwick offers a unit which covers bending

The advantages:

• The operator does not need to worry about the details and is free to concentrate directly on the test at hand.

• The tests are performed under constant conditions even when there is a change in operators.

• The bursting of the specimen is recognized by the machine and the test is ended. This way, the membrane is stressed less and has a longer lifetime.

• A variable data acquisition rate guarantees comparable results between producer and processor.

• The flow is controlled in a very narrow tolerance range and remains constant even at high loading.

• With the real-time graphics (Fig. 16), the operator immediately sees if the test has been performed correctly.

• Service interfaces and maintenance friendly construction reduce idle times and consequential costs.

• These accessories require connecting elements and software to be specified according to the machine.

Load cell Bending unit

Pressure in kPa Volume flow in ml/s

2000 --1-1-1- 4

0 5 10 15 20 25

Piston travel in mm

Fig. 16: Volume flow stability guarantees constant test conditions

Fig. 17: 2-Point bending unit, set-up