uring ▁ ▁After ▁the ▁papers ▁are ▁im pre gn ated ▁with ▁the ▁res ins , ▁the ▁three ▁layers ▁of ▁paper / res in ▁are ▁placed ▁into ▁a ▁press ▁which ▁simultaneously ▁applies ▁heat ▁( 1 2 0   ° C ) ▁and ▁pressure ▁( 5 ▁M Pa ). ▁The ▁pressing ▁operation ▁allows ▁the ▁therm os et ▁res ins ▁to ▁flow ▁into ▁the ▁paper , ▁then ▁subsequently ▁c ure ▁into ▁a ▁cons olid ated ▁sheet ▁with ▁a ▁density ▁greater ▁than ▁. ▁During ▁the ▁press ▁cycle , ▁the ▁decor ative ▁surface ▁can ▁also ▁be ▁c ured ▁while ▁in ▁contact ▁with ▁a ▁text ured ▁surface ▁to ▁create ▁one ▁of ▁many ▁different ▁surface ▁finish es . ▁ ▁H PL ▁consists ▁of ▁more ▁than ▁ 6 0 ▁to ▁ 7 0 % ▁paper , ▁with ▁the ▁remaining ▁ 3 0 ▁to ▁ 4 0 % ▁a ▁combination ▁of ▁phen ol - form al de hy de ▁res in ▁for ▁the ▁core ▁layers ▁and ▁mel am ine - form al de hy de ▁res in ▁for ▁the ▁surface ▁layer . ▁Both ▁res ins ▁belong ▁to ▁a ▁class ▁of ▁therm os et ting ▁res ins ▁which ▁cross link ▁during ▁the ▁press ▁cycle ▁creating ▁irre vers ible ▁chemical ▁b onds ▁that ▁produce ▁a ▁non re active , ▁stable ▁material ▁with ▁characteristics ▁different ▁and ▁superior ▁to ▁those ▁of ▁the ▁component ▁parts . ▁ ▁H PL ▁can ▁be ▁produced ▁using ▁both ▁continuous ▁and ▁dis continu ous ▁( batch ) ▁manufact uring ▁processes . ▁H PL ▁are ▁supplied ▁in ▁sheet ▁form ▁in ▁a ▁variety ▁of