Inspired by the “lotus effect”, a porous superhydrophobic PS/PVC composites film comprised of many micro-spheres and nanofibers was obtained by a simple approach. These micro-spheres were interlinked with nano-fibers. The sizes of the micro-spheres were 0.6-3 µm, and the diameters of these nano-fibers were between 100-600 nm. The water contact angle and sliding angle on the superhydrophobic film were 155±1.8ºand 3º, respectively. When water flowed through the PS/PVC composites film for 2 h, no water bead was adhered on the superhydrophobic PS/PVC composites film, and the contact angle value was remained about 155°. Moreover, the contact angle were still higher than 150° when contacting with water with the temperatures ranging from 10°C to 60°C. The surface morphology of the PS/PVC composites film can be adjusted by changing the addition of PVC.
Honeycomb fiberboard, polyethylene foam, and polystyrene foam were used to manufacture overlay cushion. The corresponding dynamical cushioning property was investigated including the effects the overlay sequence, drop height, join mode, and the thickness difference of both buffer layers. The results indicated the overlay cushion kept a relative high cushioning property when the “soft” buffer layer was directly contacted with the impact rammer. However, the result may be in reverse without adhesion. At the same time, the excessive difference of cushioning property between both the buffer layers was not beneficial to exertion of overlay cushion. Besides, this difference would be scaled up with increase of thickness difference of both the buffer layers.
The theory and methods of damage boundary curve (DBC) based on input excitation accelerations have played important role in transportation packaging designs for commodities. However, in many cases the designed cushion pads according to the concept of traditional DBC can transmit a higher acceleration than the maximum critical acceleration and yet still not cause any damage to the products. That means the conservatism exist in the traditional theory and method, which would bring over package and result in the rise of transport cost and more wastes of packaging materials. Thus, constructing new DBC are necessary in cushioning packaging designs of commercial products. In this paper, we developed a new drawing method and procedure for constructing new DBC based on response accelerations and Biot Model which is different from traditional DBC based on excitation ones. The new DBC is beneficial to overcome the conversation brought by the traditional DBC in transport packaging design, and it may have a wider application in transport packaging design for commodities.
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