Packing box equipped with airbag for shock-absorbing and manufacturing method thereof

Abstract

Disclosed are a packing box equipped with an airbag for shock-absorbing and a manufacturing method thereof, in which the airbag consisting of a plurality of air cells is integrally formed with an inner surf ace of the packing box by means of heat and pressure, instead of installing a separate shock-absorbing member in the packing box, and then air is injected into the airbag, wherein the air cells of the airbag have their own one-way valves, respectively, so the shock-absorbing function of the airbag is continuously maintained even if some air cells are broken, and additionally support square bars are integrally formed with a lower surface of the packing box, thereby further absorbing impact applied to the packing box.

1 . A shock-absorbing packing box comprising: 
 a packing box member;    an airbag bonded to an inner surface of the packing box member by means of hot-pressure; and    support square bars integrally formed with a lower surface of the packing box member,    wherein the airbag includes air cells provided with one-way valves, respectively, for controlling input and output of air, and an air injection port is formed at one side of the airbag.    
   
   
       2 . The shock-absorbing packing box as claimed in  claim 1 , wherein the one-way valve provides an air-feeding route and is made from polyethylene, and the one-way valve is accommodated in the airbag.  
   
   
       3 . The shock-absorbing packing box as claimed in  claim 1 , wherein the support square bars include a first support square bar, which is obtained by folding a first damper three times along folding lines and inserting protrusions of the first damper into slots of the first damper, a second support square bar, which is obtained by folding a second damper three times along folding lines and inserting protrusions of the second damper into slots of the second damper, a third support square bar, which is obtained by folding a third damper three times along folding lines and inserting protrusions of the third damper into slots of the third damper, and a fourth support square bar, which is obtained by folding a fourth damper three times along folding lines and inserting protrusions of the fourth damper into slots of the fourth damper, in which the first and second support square bars serve as an auxiliary lower plate of the shock-absorbing packing box, third and fourth support square bars serve as a lower plate of the shock-absorbing packing box, and the lower plate of the shock-absorbing packing box is inserted into a recess formed at a center portion of the auxiliary lower plate of the shock-absorbing packing box perpendicularly to the auxiliary lower plate of the shock-absorbing packing box, thereby forming a cross-shaped damping unit at a lower surface of the shock-absorbing packing box.  
   
   
       4 . The shock-absorbing packing box as claimed in  claim 1 , wherein the air injection port is fixedly formed at an outer portion of the shock-absorbing packing box so as to facilitate air injection into the air cells in an automation process.  
   
   
       5 . A method for manufacturing a shock-absorbing packing box equipped with an airbag, the method comprising the steps of: 
 placing the airbag onto an upper surface of a developed packing box member; and    bonding the airbag to the upper surface of the packing box member by applying heat of 180 to 250° C. and pressure of 4-6 kgf/cm 2  to an upper surface of the airbag by using a heating seal bar, without employing adhesives or other bonding agent.    
   
   
       6 . The shock-absorbing packing box as claimed in  claim 5 , wherein a sealant layer made from a mixture including at least one or two selected from the group consisting of polyethylene (PE), ethylene vinyl acetate (EVA) and polypropylene (PP) forms an outer surface of the airbag, and a core layer of the airbag is made by at least one or two selected from the group consisting of nylon, polyvinylidene chloride (PVDC), and ethylene vinyl alcohol (EVOH) copolymer, which have an oxygen barrier property.