Impact of carton base paper varieties and standards on product quality and price

Everyone knows that the price of cardboard boxes with different structures and different materials is also very different, and the price has a greater relationship with the variety and quality grade of the original paper. To make a carton is to determine the type and quality of paper according to the use characteristics and transportation conditions of the carton. This is a link that should be paid attention to to maintain proper packaging and control production costs. The base paper used to make the carton mainly includes white paperboard, corrugated paper, teaboard paper, ordinary boxboard and cowhide noodle boxboard, etc. The production process and materials of these base papers are different, and the standards are also different. Coated white paperboard has two types: white and gray, and there are three quality grades: first-class, first-class and qualified products. The items tested are: moisture, quantitative, quantitative deviation, banner quantitative difference, tightness, brightness ( Whiteness), printed surface roughness, smoothness, printed gloss, ink absorption, printed surface strength, water absorption, horizontal stiffness and dustiness, etc. White paperboard is the material used for pre-printed carton face paper. The quality of white paperboard has a great influence on the printing and strength of the carton.

The moisture, printing surface roughness, smoothness and surface strength of white paperboard are more sensitive to the printing quality. Moisture will have a certain effect on the registration of the printing plate, and the printing surface roughness, smoothness and surface strength indicators It has a great impact on printing quality, such as whether the printing ink layer can be saturated, whether delamination and blistering can occur after printing on the paper. The horizontal stiffness of the white paperboard affects the compressive strength of the carton; the tightness of the white paperboard is not as high as possible, but it is specified not to be greater than a standard value, such as premium products (quantity ≤300 grams) is not greater than 0.88g / cm³ . Because if the tightness of the white cardboard is too high, the folding resistance of the carton rocker lid will be significantly reduced, and the rocker lid will easily break during use.

Corrugated paper is mostly used for the corrugated layer of carton, but also for the sandwich layer or inner layer of corrugated cardboard. The quality of corrugated paper used in corrugated layer directly affects the compressive strength of the carton. The standard of corrugated paper is divided into four grades A, B, C and D. The quality indicators such as A are the highest. The routine inspection items include moisture, quantitative, tightness, lateral ring pressure index and crack length, among which the horizontal ring pressure index, Quantitative and tightness indicators have a greater influence on the edge compression strength of corrugated cardboard. Cardboard paper is generally used for carton paper or backing paper, and its quality has a greater impact on the strength of the carton. Ordinary box board paper and cowhide noodle box board are divided into three types: superior products, first-class products and qualified products. Their standards include moisture, basis weight, tightness, transverse ring pressure index, burst resistance index, water absorption on the front and back sides, transverse folding resistance, etc., among which the transverse ring pressure index, burst resistance index and quantitative burst resistance of corrugated cardboard, The impact of piercing strength and edge pressure strength is obvious. These are the objective facts proved by the production process practice.

The author believes that as the source of carton quality, base paper must focus on strict and effective control. The main methods are as follows: in the contract, the type, quality grade and standard items of the original paper purchase should be clearly specified in the contract. The inspection items and standard values ​​can refer to the relevant national standards, or they can be agreed by both parties. The standard and inspection items of the base paper should be determined according to the characteristics of the product, such as the test items that can increase the sizing degree of corrugated paper and cardboard paper, because if the sizing degree of the base paper surface is good, the base paper is not easy to absorb moisture, and the adhesive is absorbed when mounting The amount is correspondingly small, which is conducive to the drying of the cardboard and improves the strength of the carton. In addition, it is necessary to check the acceptance of the purchased base paper and test it according to the standards and the rules stipulated in the contract. This is an important part of ensuring the quality of the purchase. Because buying base paper is not simply buying variety and quantity, but the standard and quality of buying base paper. It can be said that buying qualified base paper is the basis for reducing production costs and improving the quality of carton.

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