1. Weight (Basis weight)
Weight refers to the weight of the paper. The unit is Area 1 gram per square meter, or pounds per 1,000 square feet of weight in relation to the physical properties of paper. The strength of the paper is that all paper must be related to the standard requirements, though this feature is not qualified to apply. Direct relationship It has other features. Paper is very much the same type of paper strength is increased. The weight increase is used to divide classes or grades of paper, paper, paper selection is often compared to standard features like using the same criteria as always.
The uniformity of the weight of the paper sheet are important in the production process to be highly active, for example. Weight standard deviation makes the consistency of the skin is not the same to make printing on the surface of a dislocation. Weight can affect the cost of production. The paper roll is heavy in length will be reduced. The finished product due to less paper is used as the main area. While the price of paper representing a price-to-weight paper, so users appreciated the paper as light as possible. But continue to feature as they are typically assigned to a weight standard deviation of not more than + 5 per cent.
In addition, the standard weight is correlated with the moisture content in the paper as well. The instrument is tested Analyticalbalance Standard tests include ISO 536 (sticky paper), ASTM D 646, TAPPI T410. ISO3039 (corrugated).
2. Water absorption (Moisture content).
Water absorption refers to the ability to absorb water in the area of one square meter of paper within the specified period, in grams per square meter. For tests with sticky paper and corrugated sheets, this value indicates the fluid is applied to the paper such as water, liquid glue, ink penetrates into the paper as much profit. As well as Correlated with the strength of the paper in a corrugated box. If the absorption of water can affect the strength of the decrease. This box should not be applied to packaged foods, frozen fruits and vegetables, use a box with a wax coating on the surface of the box. The test, called "Cobb Taste" (Cobbs Test) test is a tool Cobbs sizing tester used standard tests including ISO 535, ASTM D 2045, TAPPI T 411.
For water absorption of paper, corrugated paper, referring to the absorption of 0.05 cubic centimeters. It will have 0.05 seconds per cubic centimeter. This value indicates the ability to absorb water, made of corrugated paper. The equipment used is covered Moretti and stopwatch. Test methods used TIS. 321, which provides a corrugated water absorption in the range of 30-200 seconds and 0.05 cubic centimeters.
3. Ring crush resistance
Resistance refers to the ability of the press ring paper fixed length. To bend the ring. In order to resist pressure In line with the plain paper. Fold the edges of the paper less measured in Newtons (N) or kilogram force (kgf) of pressure against the outer ring. The paper machine horizontally It is associated with resistance force. Or the strength of stacked boxes of paper or cardboard cylinder. In addition, the strength of the relationship with the press ring presses against the pressure of vertical corrugated sheets can resist the pressure rings in its quality control processes and ensure the quality of products on the production line.
The strength of the ring surface paper, corrugated boxes and paper can be made to calculate the strength of the corrugated them. The instrument is a pressing machine (Crush tester) and the catch specimen (ring crush holder) standard used include TAPPI T 818, TIS. 321.
4. Edge-wise crush resistance
Resistance to vertical refers to the ability of the corrugated sheet rectangular to resist pressure to act in line with the portrait of corrugated until the corrugated sheet break or collapse is measured in kN. m
This test is very important for the corrugated sheets. It is a value that indicates the strength of corrugated sheets. Which is directly related to the strength of stacked corrugated or the pressure of the box itself. The strength in the vertical position can be calculated to determine the strength of the corrugated cardboard.
In the case of corrugated sheets of corrugated first floor height will affect the strength that is the vertical height of the corrugated many would have the strength to press vertically so as well. The comparison will be tested at the same conditions and use.
The composition of the paper used to make corrugated sheets as well. The instrument is a pressing machine (Crush tester) standards that include testing.
ISO 3037, TAPPI T 811, TAPPI T 823, JIS-0410.
5. Bursting strength
"Resistance, burst strength refers to the ability of paper or corrugated sheets to resist pressure exerted on testing rates increased steadily until the test strip is cut under the given conditions is measured in kPa (. kpa), or force per kg Square centimeter (kgf / cm2) In general, the anti-burst strength is based on the ratio of fiber preparation and fiber, as well as additives in the paper.
To test the anti-burst strength of sticky paper (paperboard) is a test to control for the production of corrugated sheet boxes for the third floor is not suitable for testing the strength to push through. To test the anti-burst strength of the paper ball at the second floor, there is uncertainty as accuracy testing the bursting strength of corrugated sheets. So there are many layers to test both sides of a sheet of corrugated cardboard.
This feature is associated with a lack of tensile strength and tear and to indicate the toughness. Or the quality of the paper used to make the surface of the box and directly related to the use of paper products, paper bags and cardboard boxes, especially if used in the same manner as the test of TIS. 550 will be strong resistance. bursting of corrugated sheets to determine the size and weight of the packaging. And is a key requirement of the container. For transportation in the US The container must have the strength to push through as defined in Rule 41, U.S. Uniform (Railroads) Freight Classication.
The pressure resistance through the key features for the product that caused the pressure inside out box is a small area, such as product features internal pressure from outside the box is a small area, such as product characteristics. lumpy Bars or cans, etc., it is necessary to use a corrugated sheet with the smell of anti-burst strength is high. Due to the impact of the product on its packaging, which indicates the ability to support the weight of the packaged goods clutter on the walls of the box when the instrument was transported Mullen tester testing standards including ISO. 2758 (sticky paper) ISO 2759 (corrugated sheets) ASTM D 774, TAPPI T 403 (sticky paper) TAPPI T 810 (corrugated sheets), BS 3137, ISO 550."
6. Compression strength
The strength of the corrugated cardboard refers to the ability of the pressure exerted on the resistance. The corrugated cardboard box is deformed or pressure any more is not measured in Newtons (N) or kilogram force (kgf) This test method. Corrugated boxes used for the test at a rate that regularly corrugated boxes and corrugated packaging products.
The strength of the corrugated boxes used to calculate the number of layers of stacked boxes of packaged goods. Although this test is directly correlated to the strength of corrugated boxes stacked on them. But the numbers were not It is indicative of the weight that can be used to really stacked. Because in practice require a multiplier for safety (Safety factor), which has been involved for the strength of the box may be reduced. This is due to various factors That will affect the value. Pressure-resistant corrugated boxes, including the amount of humidity in the storage period. In the form of stacked boxes. The number of moving Manner of handling, etc. However, this feature has been a crucial issue. And a set of corrugated products to suit. Compression tester tool was used standard tests such as ASTM D 642, ISO 2872, TAPPI T 804.