May 7, 2020  7  US 2020/0139427 Al  28.  The method according to claim  5,  wherein the furane  resin is a reaction product from furfuryl alcohol and form› aldehyde, as well as compounds containing nitrogen, such as  preferably urea, preferably with a molar ratio of furfuryl  17.  The method according to claim  1,  wherein the refrac› tory basic mold material comprises one or more constituents  16.  The method according to claim  1,  wherein the amount  of the acid is between 0.1 % by weight to 3.1 % by weight,  preferably between 0.1 % by weight and 2.6% by weight, and  particularly preferably between 0.1 % and 2.1 % by weight  acid, relative to the refractory basic mold material, or  respectively between 0.1% by weight to 3% by weight,  preferably between 0.1 % by weight and 2.5% by weight, and  particularly preferably between 0.1 % by weight and 2% by  weight, relative to the mold material mixture.  27.  The method according to claim  26,  wherein:  26.  The method of claim  1,  wherein the resin component  comprising a furane resin is a reaction product from at least  an aldehyde compound and furfuryl alcohol, and compounds  containing nitrogen and/or phenol compounds, wherein the  nitrogen content of the resin component is less than 5% by  weight, and wherein the resin component comprises more  than 5% by weight and less than 50% by weight monomer  furfuryl alcohol, relative to the resin component.  15.  The method according to claim  1,  wherein the acid  component of the binder is para-toluenesulfonic acid, sul› furic acid, or lactic acid, or a mixture thereof.  14.  The method according to claim  1,  wherein the acid  used for curing the resin component has a  pKa  value at 25°  C. of less than 4, preferably with a  pKa  value less than or  equal to 3.9, preferably with a  pKa  value less than 3, and  particularly preferably within a  pKa  value less than 1.5.  25.  A mold or core producible according to the method of  claim  1  for metal casting, in particular iron, steel, copper or  aluminum casting.  24.  The method according to claim  1,  wherein the print› head is movably controlled by a computer, at least in one  plane, and the nozzles apply at least one component layer› wise, and/or the printhead is heatable.  13.  The method according to claim  1,  wherein the amount  of the resin component is between 0.1% by weight and 5.3%  by weight, preferably between 0.3% by weight and 4.3% by  weight, and particularly preferably between 0.5% and 3.1 %  by weight, relative to the refractory basic mold material, or  respectively between 0.1 % by weight and 5% by weight,  preferably between 0.3% by weight and 4% by weight, and  particularly preferably between 0.5% by weight and 3% by  weight, relative to the mold material mixture.  12.  The method according to claim  1,  wherein the resin  component at 20°  C. has a surface tension from 10 mN/m to  70 mN/m, preferably from 15 mN/m to 60 mN/m, particu› larly preferably from 15 mN/m to 55 mN/m and especially  preferably from 20 mN/m to 50 mN/m, determined by the  Wilhelmy plate method with a Kriiss Kl 00 force tensiometer  at 20°  C.  23.  The method according to claim  1,  wherein the print› head has a plurality of nozzles, and the nozzles are prefer› ably selectively controllable individually, wherein the print› head is in particular a drop-on-demand printhead with a  bubble jet or piezo system.  11.  The method according to claim  1,  wherein the resin  component has a viscosity (DIN EN ISO 2555, Brookfield,  25°  C.) of 2 mPas to 70 mPas, preferably 5 mPas to 60 mPas  and particularly preferably 5 mPas to 50 mPas at 25°  C.  22.  The method according to claim  1,  further comprising  the following steps:  21.  The method according to claim  1,  wherein the tem› perature of the printhead is between 20°  C. to 80°  C.  20.  The method according to claim  1,  wherein the acid is  added to the refractory basic mold material discharged  layerwise, wherein the mixture is produced from acid and  basic mold material preferably at 10°  C. to 45°  C., and the  layer thickness of the mixture consisting of acid and basic  mold material is 0.03 mm to 3 mm, preferably 0.03 mm to  1.5 mm, before selected regions of the mixture consisting of  acid and basic mold material are selectively printed with the  resin component.  10.  The method according to claim  1,  wherein the resin  component additionally comprises an organic solvent that is  not furfuryl alcohol with 1 to 25 carbon atoms, preferably  alcohols, in particular ethanol, wherein the amount of  organic solvent does not exceed an amount of 30% by  weight, preferably an amount of 25% by weight, and par› ticularly preferably an amount of 20% by weight.  9.  The method according to claim  1,  wherein the overall  amount of water in the resin component is at most 40% by  weight, preferably at most 35% by weight, and particularly  preferably at most 30% by weight.  8.  (  canceled)  7.  The method according to claim  1,  wherein the resin  component contains  O  to 25% by weight, preferably 1 to  20% by weight, and in particular preferably 3 to 15% by  weight reaction products of formaldehyde and urea.  19.  The method according to claim  1,  wherein the refrac› tory basic mold material is used at more than 80% by weight,  preferably more than 90% by weight, and particularly pref› erably more than 95% by weight relative to the mold  material mixture.  18.  The method according to claim  1,  wherein the refrac› tory basic mold material has an average particle diameter of  30 µm  to 500 µm, preferably between 40 µm  and 400 µm,  and particularly preferably between 50 µm  and 250 µm.  6.  The method according to claim  1,  wherein the acid  catalyst for the production of the reaction product from  formaldehyde and furfuryl alcohol is an acid with a  pKa  value of 2.7 to 6, preferably with a  pKa  value of 3 to 5, and  particularly preferably lactic acid or adipic acid, as well as  combinations thereof.  formaldehyde greater than or equal to 1, preferably 1 :0.2 to  1:0.9, preferably 1:0.2 to 1:0.8, and particularly preferably  1:0.3 to 1:0.7.  of the group cons1stmg of quartz sand, zirconium sand,  chrome ore sand, olivine, vermiculite, bauxite, fireclay, glass  pearls, glass granules, aluminum silicate microspheres and  mixtures thereof.  i) after termination of layerwise construction, curing the  body in an oven or by microwaving, and then  ii) removing the unprinted mixture consisting of the acid  or resin component and basic molding material from  the at least partially cured casting mold.  the compounds containing nitrogen include urea, and/or  the amount of the compounds containing nitrogen is  chosen such that the overall amount of nitrogen in the  resin component is less than 5% by weight, preferably  less than 3.5% by weight and particularly preferably  less than 2% by weight. 