Corrugated carton production quality comprehensive test

When considering how to test the corrugated boxes produced, we should first understand what quality and characteristics of finished cartons are required. In general, all compression cartons are required to have the following four characteristics: ■ Beautiful appearance: Including clear printing, clean and stainless 1 (especially bar code and manufacturer's identification Sn brush), pressure lines, slitting and slotting clean Neat, dimensional standards. ■ Can protect any interior contents ■ High compressive strength ■ Durable What can the carton manufacturer do with the carton? The carton appearance test is a very subjective test and often needs to be judged by experts. . The strength is easier to quantify, and the next carton and composite board test method can test the carton structure and strength. ■ BC Ding (carton compressive strength test) ■ ECT (carton side pressure test) ■ Bending strength test ■ Connecting strength test ■ Flat compressive strength test ■ Thickness test ■ Rupture degree test Carton compressive strength test Most cartons are made Compressed carton form - often referred to as RFC (Folding Carton). Carton manufacturers want to design and sell items that can be erected when they are needed to increase the stacking strength of corrugated boxes. Carton can be filled with the goods to be loaded, and then the carton is tested. In addition to compressive strength, it is also necessary to perform seismic, anti-sloshing, and anti-impact tests; mid-impact tests are performed to analyze whether carton boxes and interior contents can withstand these vibrations in a real environment. Edge Pressure Testing The Edge Crush Test (ECT) is very important because the carton manufacturer can predict the side pressure strength of the carton by testing the edge pressure of the corrugated cardboard. With the McKee formula, the carton's edge pressure performance can be predicted. ECT is usually performed on 2 x 2 inch corrugated cardboard. By ECT, you can know the compressive strength of the composite board under pressure conditions. The paper board's cross-sectional side pressure strength is generally considered to be the most critical factor related to carton strength. (Pressure strength at the cross-section of the carton is tested in the transverse direction of the corrugated board, ie in the direction of the corrugation) Flexural strength test When stacking the carton, the lower carton is subjected to pressure from the upper carton. The surface of the pressed carton will deflect, bend inward or bend outward. This causes the upper pressure carton to concentrate the pressure on the corner of the lower carton. Obviously, the strength of the corrugated box is very much related to the corner of the carton. Flexural strength tests are commonly used to test the flex resistance of the carton surface. The higher the flexural strength of the cardboard, the higher the flexural strength of the carton. Like the ECT, flexural strength tests can also use the Mckeen formula to predict carton bending resistance. Whether from the top to the bottom, or the edge to edge bending strength test is very important for the carton. The average value of the two flexural strength test values ​​can be used in the McKee formula. In general, the cardboard size used for flexural strength testing is 2 x 12 inches. Connection strength test The connection strength test is used to test the strength of the connection between corrugated medium and single-sided cardboard or double-sided cardboard. In this test, 2x6 inch corrugated cardboard was used. Bonding strength refers to the strength required to separate the coreboard and the faceboard. Surprisingly, the strength of the connection has little significance for the strength of the section tested in the ECT. This may be the reason why the connection strength test has not been widely applied to corrugated board strength tests. Plane compressive strength test The Planar Compressive Strength Test (FCT) can be performed on a square or rectangular corrugated cardboard sample, but is usually more commonly performed on round samples with an area of ​​approximately 5 square inches or 10 square inches. inch. Through the plane compressive strength test, you can know whether the corrugated is damaged during processing. If the corrugated is damaged, even if it is not visible on the surface, it will affect the strength of the corrugated box, weakening the compressive strength of the corrugated box by about 20%. This phenomenon is not uncommon in the old-fashioned flexo folding folder machine, but the McKee carton formula does not include the plane compressive strength. Reduced compressive strength in the plane will affect the flexural strength of the board and indirectly affect the McKee formula. However, studies have found that this indirect test method does not reflect the decrease in the compressive strength of the carton due to carton cracking. Therefore, be cautious when testing the compressive strength of the plane to determine the strength of the carton. One way to predict the likelihood of carton cracking is to look at the changes in plane strength before and after processing. If the change is large, it means that there will be potential cracking problems in the strength of the carton. Composite board thickness The thickness of the corrugated board after finishing is very important. It means a good corrugated board processing process. Thickness plays an important role in the strength/weight ratio. The strength/weight ratio is an important guarantee for good transport. The thickness of the composite board can undoubtedly enhance the strength/weight ratio and many other cardboard properties. The most typical C corrugated board profile is 142mm in height and 39 ft/ft. Sometimes the thickness test is used as an indicator of the flat compressive strength, which is easily misleading because the corrugated cardboard has a high elasticity, and even after cracking, it may return to its original thickness. Due to the elasticity of the corrugating medium, it is still possible to recover the original shape when testing the corrugated cardboard. Even if it is damaged, it may seem normal. The best method is to perform FCT before and after the processing of corrugated cardboard. (to be continued)

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