Plastic turnover box of hollow board production line
DATE：2021/5/11 9:09:26 / READ： / SOURCE：This station
Plastic turnover box of hollow board production line
Hollow board production line www.handern.comPlastic turnover box is a kind of hard packaging container which is made by injection molding and used for commercial short distance transportation or parts circulation in production workshop. Its capacity can be between 1L and 1000L, up to 2000L. It is used to replace the original wood, cartons, tin boxes and has a light weight, beautiful, clean and sanitary, moisture-proof, rust, pest prevention, reduce the loss of parts or products - a kind of convenient, long service life packaging, has been widely used in vegetables, food, machinery parts and other packaging. Hollow board production line www.handern.com
Plastic turnover box can use HDPE, PP, PVC, ABS, hips, PA6, PC and other thermoplastic plastics by injection molding, the use of different raw materials, turnover box performance is also different. HDPE and PP resins are the most widely used in China. Generally Special resin grade of turnover box. First, the range of relative molecular weight distribution is narrow; Second, the range of melt flow rate and density is small. HDPE is mainly copolymer, and HDPE homopolymer can also be used, but PP is copolymer. Because PP Homopolymer has poor cold resistance and can not be used below 0C, it is easy to crack. The MFR of HDPE and PP should be between 1 ~ 15g / 10min, which can be selected according to the structural design and molding conditions of plastic turnover box. In order to improve the rigidity and reduce the cost of the turnover box, it is an effective method to add various inorganic fillers to the resin or use a certain proportion of cheap recycled particles of the same resin. Low foaming turnover box can be produced by adding a small amount of foaming agent into the resin. Due to the long outdoor application time of turnover box, it is necessary to add ultraviolet absorber and a small amount of antistatic agent. Hollow board production line www.handern.com
The key points of plastic turnover box product design are the design of frame structure and size, the design of wall and stiffener, and the layout of hole grid. The design should meet the following requirements: first, drop strength; Second, the stacking strength (stacking height) is the second, Fourth, anti-collision and good impact strength; fifth, avoid stress concentration and reasonable layout; Sixth, the minimum amount of material, and has a better strength: seventh, to adapt to the stacking of packaging products. The design of frame structure has formed serialization and standardization. Generally, the stacking height of PP epicyclic phase is 2.5~ 4 mm. The reinforcing rib acts as a framework support in the plastic turnover box. Hollow board production line www.handern.com
There are various forms of stiffeners for plastic turnover box: right angle type, rectangular right angle type, right angle side beam type, angle thickening stiffener, concave convex stiffener, arc stiffener and so on.
In addition to the foldable turnover box using assembly injection molding, the rest are made of integral injection molding. In the mold design, we should pay full attention to the taper and size to facilitate exhaust, cooling and demoulding. The condition of injection molding is the same as that of general PP (copolymer grade). The main types of plastic turnover box are straight type, ladder type and folding type. The straight type can not be fitted, so it is not affected by the expansion force. But it occupies a large area and is not convenient for transportation. The trapezoids can be fitted to each other. The area of the site is small and easy to stack. Foldable type is convenient for use and storage, with constant micro degree of fire. It can be divided into several types, such as middle partition, hole lattice structure, flat plate structure, open type and cover plate type. The ladder series hole lattice structure plastic box is widely used. After loading goods, it can add metal frame support. When empty, it can be stacked together. The mold is easy to process during production, but it should be ensured that the box will not deform under heavy pressure, It has enough strength and rigidity. Ladder series flat turnover box, because there is no hole grid, the rigid strength of the box increases. Trapezoidal series interchange concave convex groove structure turnover box: after loading goods, it does not need the support of metal frame. With the help of two concave convex grooves on the two sides of the box, it overlaps and stacks each other. Its disadvantage is that the bottom box often expands and deforms due to the stacking weight, which damages the goods. The straight series turnover box with pulley can be used for the transmission of parts in workshop or between workshops, which is easy to move. Hollow board production line www.handern.com
The coating and printing of plastic turnover box should be pre treated. The surface treatment methods include sand blasting, chemical corrosion, flame treatment, etc. the applicable method of turnover box is flame treatment. For HDPE material, acetylene oxidation flame or civil gas (or propane gas) can be used. For PP material, oxidation flame of civil gas or propane gas should be used. The processing temperature is 10002700c. The higher the temperature is, the better the printing fastness is. The processing time is about 6S. If the processing time is too long, it is easy to deform or burn. Hollow board production line www.handern.com
Author：admin