To address the creation of new products that trend seek

• No.2021
• [JIS]
• [TAPPI]
• [ISO]

In the international standard, burst strength is specified as a value of pressure that is necessary to make the paper or paperboard burst, by exerting pressure to the paper sheet with a certain speed and deforming the paper into a shape of a ball. This machine features the possibility of testing burst strength safely and rapidly: the specimen is applied the pressure that is exerted via a rubber diaphragm by the penetration of a motorized plunger, and the pressure sensor detects and displays pressure strength at the moment the specimen bursts. This machine comes into two types: type C and type A. Type C is designed for paper sheets, paperboard and film 0.64 mm or less thick, and Type A for paperboard, corrugated board and the like. Unlike the conventional Mullen type, the KRK burst strength tester features many advantages, for example, high precision, reproducibility and operability. This machine focuses on the safety. KRK offers the model with a printer or a paper feeder as well.

• No.2028
• [JIS]
• [TAPPI]UM522
• [ISO]

This ply separation strength tester is designed to be used together with a burst strength tester to measure ply separation strength of paperboard. The principle is as follows: the specimen, composed of two pieces of paperboard bonded together and cut off in the shape of a doughnut, as shown in the figure, is bonded in a state of being pinched between the circular plate and the holeless metallic plate to be inserted into the burst strength tester for pressure application. During being pressurized, the rubber diaphragm inflates toward the holeless disc. The gauge reads a maximum pressure at the moment ply separation occurs.