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.