Pap-Tech Engineers & Associates

In schopper type tester loading clamps of spring type gives standard load of 1000gm during the test provided along with FIVE FIGUR COUNTER having hold and zero setting. 

Standards:

• As per TAPPIT-833,ISO-5626

Technical - Specification:

• Working Unit : Two separately working folding units for quicker test.
• Stretching force : Maximum 9.81 N and Minimum 7.55 N
• Folding Roll Diameter : 6 mm
• Distance Between folding rolls : 0.5 mm
• Deflection on either side : 10 mm

The Cobb Sizing Tester evaluates the water absorbency of paper-based materials by measuring the weight increase of a sample after exposure to water for a specified time. It is an essential quality control tool for assessing the material's resistance to water, ensuring performance in various applications like printing and packaging.

Features and Design

1. Material Construction:

   • Made of stainless steel, ensuring durability and resistance to corrosion.
   • Includes a stainless steel roller for drying the wet sample after testing.

2. Rotational Mechanism:

   • Equipped with a circular pan that rotates 180°, facilitating even water exposure.

3. Spring-Loaded Clamping System:

   • Ensures a leak-proof seal by pressing the cylinder against the sample on a rubber mat.
   • The clamping force is adjustable, and the cylinder can be easily lifted by pinching two handle bars together.

4. Tilting Lid Design:

   • The lid is secured using spring-loaded finger grips, allowing for smooth operation.

Operational Process

1. Sample Preparation:

   • Measure the GSM (grams per square meter) of the circular sample of paper or paperboard.
   • Place the sample in the circular pan filled with water.

2. Testing:

   • Rotate the pan 180° to ensure uniform water exposure.
   • Allow the sample to sit in the water for a specified duration.

3. Absorbency Measurement:

   • After exposure, remove the sample and weigh it to determine the water absorbed.
   • Use the stainless steel roller to press and dry the sample.

4. Final Calculations:

   • Measure the GSM of the dried sample.
   • Compare the before-and-after weights to calculate the water absorptiveness or Cobb value.

Key Parameters and Insights

• Cobb Value Definition:
  The mass of water absorbed in a specific time by one square meter of material under controlled conditions.
• Applications:
  Evaluates additives applied during manufacturing that enhance printing quality and liquid resistance.
• Materials Tested:
  Paper, paperboard, and corrugated fiberboard.

Benefits

• Provides accurate and reproducible results.
• Ensures better material selection for water-resistant applications.
• Enhances the quality of products by verifying resistance to liquids.

The Cobb Sizing Tester is a simple yet indispensable tool for ensuring paper-based materials meet industry standards for water resistance.

It is used for accurate testing of Paper, Paperboard, solid Fiberboard & Corrugated board for RCT, ECT, CCT test and its components as well as performing compression test on all small FCT packages.

An efficient and easy-to-use instrument intended for testing corrugated board and its components as well as performing compression test on all small packages. The sturdy design of the instrument ensures that parallelism of the plate is maintained for accurate results. The instrument is available in two versions - the metric version and the imperial version.

Technical – Specification :

• Measuring Results : Breaking Force in Newtons.
• Measuring Range : 0 - 5000 N and 0 - 1999 N (Metric Version).
• Accuracy : ± 1% of measured value but not better than 0.5% of the
• nominal value.
• Rupture Sensitivity : 2 - 20 % of the relevant maximum load.

Standards:

• As per TAPPI standard 1301 FEFCO NO. 50, CPPAD 24, ISO 7263, SCAN P27, TAPPI T809, ISO 3037, SCAN P33 & SCAN P32.

Other Details:

• Microprocessor Models are available to be connected with computer & printer for memory with past results.