Analysis of Matching Principles of Corrugated Paperboard Materials

Corrugated board material selection general principles

Corrugated board material selection should meet the two general principles of quality selection and quantitative matching:

First, the principle of quality selection

In general, corrugated base paper and cardboard, which have similar quality levels, should be used to produce corrugated cardboard. Such as A, B grade cardboard should try to use A grade corrugated paper; D, E grade cardboard can choose C, D grade corrugated paper. If high-strength linerboard and corrugated cardboard made from low-grade corrugated medium are easily collapsed, the flat compressive strength is low.

Second, the principle of quantitative matching

Experiments have shown that improving the quantification of corrugated base paper is conducive to lowering costs. Under the condition of keeping the strength constant, for every lg/square meter of corrugated base paper, boxboard can reduce Ig/m' at the same time. Therefore, high quantification has appeared in the world. Corrugated paper is used to produce corrugated paperboard. However, if the corrugated paper is weighed too high, surface irregularities will appear, resulting in obvious corrugation marks, which will affect the appearance quality and printing effect. If the corrugated base paper is used with too low a basis weight, the corrugated paper will be corrugated. Tooth deformation, from the circular arc into a rectangular structure, affect the thickness of the corrugated board, side pressure strength and cushioning performance, so the general ratio of boxboard and corrugated paper to maintain a quantitative ratio of 2:1 is better.

The customer's requirements for the physical strength of corrugated board mainly include the burst strength, side pressure strength, puncture strength and adhesive strength of corrugated board, and the compressive strength of corrugated box. It is worth emphasizing here that these strength indicators must be data obtained after the test specimens were placed in a constant temperature and humidity environment with a temperature of 23±2°C and a humidity of 50±5% for 24 hours, otherwise the test data were The actual strength of corrugated board is inconsistent, and even some of the data will have a big difference.

Many corrugated box companies will encounter this situation, often customers in the corrugated paper box inspection receipt, due to the time or the processing environment is limited, the corrugated board is not strictly pre-measured, thus resulting in the physical strength Large deviations in the indicators cause quality disputes. This requires corrugated box companies to communicate with customers in advance to reach a consensus. ·
.
First, the two decisive technical indicators of the base paper affecting the strength indexes of corrugated paperboard and corrugated paperboard boxes are listed: the bursting resistance index and the lateral loop pressure index. Through these two decisive technical indicators, it can be decided to select the linerboard and corrugated paper that meet the requirements.

Corrugated paper index (kpa·m2/g)

The breaking index of the linerboard is the ratio of the bursting strength of the linerboard to the ration of the linerboard, ie: X=Bur/W.

In the formula: X-breakage index (kpa·m2/g) ·

Bur-breakage (kpa), the reading indicated on the pressure gauge of the instrument when the specimen breaks.

W—quantitative (g/m2)

The breaking index of linerboard paper is an important technical indicator required by the national standard CBl3024-2003. For the corrugated paper, the national standard CB1303-91 does not require the bursting resistance index. In the production of double corrugated paperboard, the corrugated paper is generally used for the core paper. The core paper affects the burst strength of the double corrugated paperboard. This requires the use of Corrugated paper paper on the core paper was tested for its burst strength, and a corrugated paper paper was prepared for its burst quality table.

Horizontal Ring Pressure Index (N·m/g)

Lateral ring crush strength refers to inserting a 12.7 x 152 mm sample into a sample holder to form a circular ring, and then compressing between the two measuring plates to withstand the maximum pressure before crushing. The lateral ring pressure index is the ratio of the lateral ring pressure strength to the quantitative, that is:

. r=R/W=N/L·W

In the formula: r—the lateral pressure index (N·m/g)

R—transverse compressive strength (N/m), R=N/L

N—lateral ring pressure

L—length of specimen, standard length 0.152m

W—quantitative (g/ms)
(to be continued)