The best choice of drum materials for the hottest

2022-09-21
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Optimization of packaging container paper barrel materials (Part 1)

packaging container paper barrel refers to a rigid barrel with a barrel body made of paper or paperboard and adhesive, and a barrel bottom and barrel cover made of the same material or other materials. It not only has high strength, but also has certain elasticity, no oxidation and no pollution; Compared with steel drums, it also has the advantages of preventing static electricity, light weight, easy recovery, short processing cycle and low cost. It is not only widely used in the outer packaging of pharmaceutical raw materials, but also widely used in the outer packaging of chemical, grain, local products, hardware, minerals, building materials, electromechanical and national defense industries. A considerable part of paper drums are used for the packaging of export commodities

the paper bucket of packaging container has positioning performance between the bottom and the cover for stacking and storage. The types of paper barrels are generally divided into two categories according to the different raw materials used: the first category is full paper barrels. Its appearance shape can be divided into cylindrical and square. The material used is high-strength cardboard, which is processed by a special paper barrel forming machine. Because most of the materials used in the paper barrels themselves are paper fiberboard and wood fiberboard, it is easy to recycle and reuse from the published literature abroad, If it needs emergency treatment, it can also be burned, and no toxic gas will be generated. Therefore, the raw materials of the whole paper bucket, the whole process of the production process and the treatment of waste will not pollute the environment. Therefore, when it is exported as a product packaging, it is generally welcomed by foreign merchants. The second kind of paper bucket is different from the whole paper bucket in that the upper opening and lower bottom of the circular paper bucket are reinforced with iron sheet, and the upper cover and lower bottom of the paper bucket are made of full paper or plywood. Under the same volume, the paper bucket structure reinforced by iron sheet is stronger than the full paper bucket in terms of strength and load-bearing weight. Therefore, this kind of paper bucket is used when holding articles with large volume and weight of more than 30 kg in the bucket

first, the impact of excessive moisture content of the cardboard used to make the paper bucket on the performance of the finished product of the bucket

because the production molding of the second type of paper bucket uses multilayer cardboard as the material and is manufactured on the bucket making machine in the form of spiral winding, the physical performance indicators of the cardboard are directly related to the overall quality of the finished product of the bucket. Determination of paperboard material 1 RH m 0250 m D60 1a01 represents RH series, m18x1.5 thread, 250mm stroke metric system, D60 plug, 4 ⑵ 0ma output is generally selected in the range of 280 ~ 360g/m2. In order to ensure the strength and rigidity of the paper barrel, take 300g/m2 paperboard as an example. Generally, the ring compression strength of the paperboard material should not be less than 2kn/m, the bursting index should not be less than 3.0KPa · m2/g, the transverse folding resistance should not be less than 50 times, and the tightness should be 1.2 g/cm3. The moisture content of paperboard material is maintained at about 10%. The moisture content of paperboard directly affects the forming of paper barrel and the manufacturing quality of finished products. When the temperature and humidity of the production environment are certain, and the moisture content of the same type of paperboard is less than 10%, the production molding performance of the paper barrel is significantly worse, the brittleness of the paperboard surface is increased, and the folding times are significantly reduced. Especially in the paper barrel molding production, the upper and lower ends of the barrel are easy to break

according to the requirements of the paper barrel forming process, the edge grinding forming process should press both ends of the semi-finished paper barrel, the curve shape at both ends should have a certain depth of arc, and the rear wheel of the equipment should be pressed with both ends of the barrel body. The degree of pressing should reach the required working limit. If the current problem of the cardboard Table lies in the safety rules, brittleness and poor toughness will cause cracks in the inner layers at both ends of the barrel body of semi-finished products, and fracture will be formed on its surface, resulting in waste products. When the moisture content of the paperboard material is too high (more than 10%), the pulp fiber of the paperboard flows irregularly in the vertical and horizontal cross-linking, resulting in the anisotropy of the paperboard fiber, and the shrinkage intensifies in the width (longitudinal) direction of the paperboard, which is easy to cause the inconsistent shrinkage of all parts of the paper barrel after storage at room temperature, thus changing the height and size of the formed paper barrel. If the shrinkage intensifies, It will make the outline dimension of the paper barrel fail to meet the required standard dimension. Make it difficult to hold the goods

II. The relationship between the material used to make the paper bucket and the stiffness of the paper bucket

the strength and stiffness of the paper bucket are not only related to the quality of the paperboard raw materials used, but also related to the number of rewinding layers and thickness of the paper bucket during forming and the axial force acting on the paper bucket during use. When the raw materials and the outer circumference of the paper bucket used for packaging valuables are determined, the vertical pressure strength of the finished paper bucket should be greater than 8000n, the lateral pressure strength should be greater than 4000N, the puncture strength should be greater than 10J, the stacking performance should be 4900n, and there should be no leakage, rupture, permanent deformation in 24 hours, which will not affect the stacking capacity of the paper bucket. Drop resistance requires falling at a height of 800mm, no leakage, no rupture, and the sealer does not open

the deformation of the paper bucket when it falls is related to the stiffness of the paper bucket, which depends on whether the rigidity coefficient of the paper bucket design is reasonable. The deformation of the paper bucket is directly proportional to the lateral pressure and circumferential length of the paper bucket, and inversely proportional to the elastic modulus of the paper bucket and the number of layers of the rewinding thickness of the paper bucket, that is, the greater the lateral pressure acting on the paper bucket, the greater the circumferential length of the paper bucket, the greater the deformation of the paper bucket, while the greater the elastic modulus of the paper bucket material and the thickness of the paper bucket, the smaller the deformation of the paper bucket with more layers of paperboard. It can be seen that in order to increase the strength of the paper bucket, the number of rewinding layers of the paper bucket and the thickness of the cardboard should be increased. The greater the stiffness coefficient of the paper bucket, the greater the stiffness of the paper bucket. Therefore, the cardboard with high elastic modulus when using the tensile machine should be selected. When the paper bucket is formed, it has a large number of rewinding layers, and the deformation of the paper bucket after loading is small compared with the structure with small diameter. (to be continued)

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