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package too high,the pressure too big,which caused the Pin deformed. the key improved points: 1.must add reinforced bar at the around of card-board. 2.must add shield angle-paper at around of card-board to reinforce 3.the label that press is forbidden(No Pressing) and frangible must marked specially on the card-board. 4.every card-board only wraps 6 plys 5.must add one ply cardboard at inner and outer ply of carton,which insure Pin can not adhere the net material.

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