Special pearl cotton is widely used in food packaging in the environment

Special pearl cotton has become more and more serious with environmental problems, and green, environmentally friendly and low-carbon plastic packaging has been increasingly emphasized and paid attention. In addition to being widely used in food packaging, plastic packaging has been further developed into industrial packaging, pharmaceutical packaging, building materials packaging, cosmetic packaging, etc., and its application planning and vision are becoming wider and wider.

As a type of dry stream for food packaging, plastic food packaging is playing an increasingly important role in ensuring food safety, and we should place higher demands on packaging products. The trend of the mainstream flow of packaging materials is probably multi-functional, lightweight, environmentally friendly and intelligent.



1. Standard and limit error targets:

The test is measured with a thickness gauge with a thickness accuracy of 0.01MMM, accurate to 0.01MM, the width and length are measured with a tape measure with an accuracy of 1MM, accurate to 1MM, and the thickness is measured according to the horizontal and vertical dimensions of the sheet. The error is calculated by the maximum value and the minimum value in the actual measurement and the nominal value;

2, the appearance of the goal:

Visual inspection under natural light;

3. Foaming ratio:

The sheet expansion ratio is defined as the ratio of the density of the low-density polyethylene resin to the apparent density of the sheet, and the density of the low-density polyethylene resin is from 0.90 to 0.92 g/cm3 (invariant value). The apparent density of the sheet is measured according to the rules. The test demand data is not less than 15cm3. Three sets of tests are taken and three useful figures are taken. Under normal circumstances, the sheet production company calculates the following simple methods:

Take a piece of 1 square meter of data (that is, the length and width are 1 meter, the thickness is subject to actual measurement)

A, length * width = square area (such as 1 meter * 1 meter width = 1 square meter,)

B. Weigh the weight of this piece of data (in grams)

C. Determination of density, the weight of the weighed component is divided by the thickness of the data to obtain the density (ie, the density per square meter of the product, and then converted to cubic meters).

D, expansion ratio: known polyethylene resin density 0.92g / cm3 divided by sheet density = expansion ratio