PRODUCT KNOWLEDGE

Cardboard barrels (iron barrels) what types of packaging structure design

Publish: 2015-06-04

The structure of the drum design mainly include the following items:

1. The selection of raw materials should be suitable for paper barrels of requirements:

Drum is the structure of the multilayer to cattle paperboard flat roll manufacturing, general selection of cattle paperboard quantitative in 250-300 g/square, in order to ensure the strength and rigidity of paper drum, general cardboard ring crush strength of quantitative raw material for 300 grams/square is not less than 18 n. m/g, burst index is not less than 3.0 kpa ㎡ / g, horizontal folding degree is not less than 50 times, moisture content is not more than 10%.

2. The strength and deformation of the drum design

Paper barrels of strength in addition to the associated with the raw materials used, but also with the thickness of the drum, and the role of paper related to the size of the axial force on the bucket, certain circumstances, the perimeter of the material determine and paper barrels of vertical compressive strength should be greater than 8000 n, lateral pressure strength greater than 4000 n, puncture strength greater than 10 n.

Deformation of the drum and its stiffness on paper drum, namely the design of rigid coefficient is reasonable. Paper barrels of the size of the deformation is proportional to the lateral pressure and the circumference of a circle that is grown up, and the elastic modulus, and paper drum drum is inversely proportional to the thickness and layers, that is: on paper barrels of the lateral pressure, the greater the circumference of a circle grew up, the greater the drum deformation; While the paper barrels of modulus of elasticity, the thickness of the layer number and big deformation is small. Conclusion: to make a drum stress is small, should be to increase the paper barrels of the number of layers and the thickness of the cardboard. While the paper barrel stiffness coefficient is big, the greater the stiffness of barrel is paper. Material should choose high modulus of elasticity of cardboard, paper thick layer, the structure of the relatively small diameter.

3. The top and bottom paper barrels of concave ring groove design:

To strengthen the drum strength and fixed on the drum, the mouth and roll has a concave ring groove, also known as barrel hoop. Barrel mouth parts on the band called barrel hoop, lower () at the bottom of the barrel under the band called barrel hoop.

Barrel hoop on the main functions are:

1) ensure the strength of the drum, and keep the barrel mouth in roundness.

(2) reinforce the closure, can make the barrel and the barrel mouth well location and for the interchange function.

(3) convenient paper barrels of molding equipment (sealing machine).

The function of the barrel hoop is fixed barrel and bottom as firm as a whole. So the barrel hoop grooves of the arc shape and size design is reasonable or not, has enormous influence on the quality of paper barrel. Design of barrel hoop too deep and the circular arc is small, easy in the forming process of medium voltage is broken barrel body; Barrel hoop under a shallow and circular radian is too big, will directly affect the bottom structure (the body) and connectivity, and in the process of forming back ShiGang with ring deformation is large, the quantity of steel coil to the bucket in relatively few, cause body combined with bottom not firm, so paper barrel hoop up and down in the design of circular arc shape, size, need according to choose the strength of the craft, the thickness of the bottom and the technology molding equipment is adopted by the many factors such as comprehensive consideration.

4. The paper barrels of easy problems and corresponding countermeasures

Paper barrel in use process, there is a problem for the drum deformation in the process of handling large, barrel body and the bottom off easily, especially at the bottom of the bucket and bucket bottom joint release, causing quality problems.