Twin Folding Tester by Schopper Method - OpTest

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Twin Folding Tester by Schopper Method

Equipment used to determine the resistance of a sample of standardized paper, submitted to the continuous action of double folds. Frequently used in the world of paper money and security. Manufacturer of cotton paste etc. Two measuring heads. Equipment with temperature marking of the two heads and the ambient temperature. Simple and easy to use. 4-inch color touch screen, where we get all the results and complete statistics of the equipment. Methacrylate for protecting the heads to improve the safety and reliability of the test.

Product Name Twin Folding Tester by Schopper Method
Product Code PTA-110106
Standards/Methods TAPPI T 523, ISO 5626, NF Q03-062, NF ISO 5626
Test Material Paper
Manufacturer The PTA Group (PTA)
Availability from OpTest Exclusive to Canada, USA, and Mexico

• Papers up to 0.25mm thickness
• Temperature Display of each Head and the Laboratory.
• Spring force min. 7.55N / max. 9.81N
• Testing length: 90mm
• Sample length: 100mm
• Sample width: 15mm
• Speed: 115 ± 10 strokes/min
• Touch screen with statistic functions
• RS 232 interface for result transfer
• Compatible with NOVILOG
• Optionally available with temperature sensor for temperature deviation measurements.
• CE mark.
• Electrical Connection: 230/110V 50/60 Hz
• Weight (equipment only / with packaging): 50 kg / 80 kg
• Dimensions (W x L x H - equipment only): 530 x 490 x 340 mm


The device measures the number of folds until the sample breaks. The test requires that two samples be tested simultaneously.

Test Description:
One liter of suspension, which has been prepared with the standardized disintegrator, needs to be poured into the chamber while the bottom lid is closed. The top lid Two samples are clamped in the folding heads for a simultaneous test. The spring-loaded sample supports are pulled apart, so that the samples are clamped at the specified force. After pushing the start button, the folding knives begin to guide the sample around the sapphire supported folding rolls. That way, the samples are folded on both sides at a radius of 0.25mm. If one sample breaks, the folding process of the second sample continues until it breaks too. The movement of the folding heads stop after test termination, so that the samples can be removed. The device records and displays the number of folds until the sample breaks.


User Interface:
• Machine controlled by means of a touch screen and two auxiliary buttons.
• Through the visualization and control screen, the total control and configuration of the machine can be managed.
• Easy and intuitive operation of the control menu, configurable in different languages.
• Two result tables with a maximum of 20 test results per table (10 samples tested in MD (Machine Direction) and a second table with the samples tested in CD (Cross Direction). A maximum of 20 tests results can be stored in each table (10 for “A” station and 10 for “B” station).
• Statistical control. Mean value, standard deviation, and maximum and minimum values.
• Periodical program updating (without additional costs).


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