What is ring crush test in paper?
Ring crush testing is used to measure the edgewise compression of paper and board materials. A short cylinder of material is inserted into an annular groove and axially loaded to failure. Results are quoted in kN/m. We measure in conformity with International Standard ISO 12192.
What is CMT paper?
The CMT or Corrugating Medium Test (Concora) determines the flat crush resistance of corrugating papers. It is a way of estimating the crush resistance of corrugated board manufactured with those papers (FCT: Flat Crush Test). The result is expressed in NEWTONS (N).
What is RCT value of kraft paper?
High RCT Kraft Paper
| PROPERTIES | UNIT | 140 |
|---|---|---|
| GSM | GM/M² | 140 ± 5 |
| MOISTURE | % | 6.5-7.0 |
| COBB VALUE | G/M² | 35-45 |
| RCT C.D. | KN/M | 1.4 |
What is a crush test?
Top Load Testing, Crush Testing or Compressive Testing is a popular test used in the packaging industry to measure the strength of bottles and similar containers. By crushing samples to a specific distance (usually ¼”) and measuring the load it is possible to determine the quality of the bottles being produced.
How do you calculate ECT?
It is measured by compressing a small segment of board on edge between two rigid platens or plates perpendicular to the direction of the flutes until a peak load is established. This is measured in pounds per lineal inch of load bearing edge (lb/in), but usually reported as an ECT value (for example, 44 ECT). 40 lbs.
How do you calculate RCT to ECT?
RCT = 0.9625 where the ECT, SCT and RCT are in kN/m, the correlating constant (k) is dimensionless and α is the profile and plant specific flute take up factor.
What is crushing strength test?
compressive strength test, mechanical test measuring the maximum amount of compressive load a material can bear before fracturing. The test piece, usually in the form of a cube, prism, or cylinder, is compressed between the platens of a compression-testing machine by a gradually applied load.
Is a 44 ECT a double wall?
This type of box can be purchased in single or double wall to resist tearing, splitting, or bursting. All of our heavy duty boxes are 44 ECT and are approximately 35% stronger than standard boxes.
What does 48 ECT stand for?
Edge Crush Test
ECT stands for Edge Crush Test and is one of the most popular methods of determining the actual strength of a corrugated box or other corrugated material. Ultimately, edge crush testing shows us two things: box compression strength and stacking strength.
What is RCT in corrugated box?
The ring crush test (RCT) is used to determine the ring crush resistance of a paper strip formed into a ring with a standardized length and width.
What kind of test is the ring Crush Test?
This is a traditional test of linerboard and corrugating medium strength. Ring crush measures compression resistance, and this compression strength is considered to relate to the eventual compression strength of combined board made from the components. The test is run according to TAPPI Test Method T822.
How is the ring Crush Test of paperboard used?
The model is applied using a wide range of medium and linerboards obtained from 2 mills. The ring crush (RC) test and the short-span compression (STFI) test can be used to evaluate the compression strength of corrugated board components, and can be correlated with combined board strength.
What happens if you dry up paper to improve ring Crush?
Realize if you dry up the sheet to improve ring crush, it may reduce your tensile strength, or burst strength. Also, increasing basis weight will increase the cost of production. However, it is better than producing broke, or reject paper.
What kind of crush test is used for linerboard?
Linerboard and medium for corrugated packaging has been traditionally marketed on the basis of Ring Crush (RCT) specifications. The current industry trend has replaced manual testing by automated in-line testing which excludes RCT but has basis weight, an ultrasonic stiffness index (TSI), and short span compression (SCT) commonly available.