We are taking the lead in producing a product that is less dependent on diminishing white ﬁber sources. This new sheet can replace standard gypsum face paper and will produce a more uniform color with an improved surface.
All Republic Paperboard products can be customized to fit your needs! Contact our sales team and we’ll be happy to work with you to create the product that meets your exact specifications. Contact Us Today
Many of the ﬁber sources that were once used to produce gypsum face paper have diminished due to the electronic age with less use of newspaper and lower availability of unprinted white ﬁber. Republic saw the future and started investingating alternatives and options. A newer type coater was gaining ground in the U.S., the curtain coater. The curtain coater has deﬁned advantages over standard blade, air-knife and rod coating that looked like a viable option for Republic. After approximately ﬁve years of research and development, Republic ﬁnalized a coating formulation that works in the gypsum board process. Board was produced using the coated paper, evaluated and tested and found to run well in the board plant. Finished gypsum board was then installed on various jobs from oﬃce to commercial buildings and performed well.
|Critical Properties||UOM||Min||Target||Max||Test Method||Method Comments|
|Basis Weight||lbs/msf||-2.0||as ordered||+2.00||ABB Scanner|
|Moisture||weight %||7.5||9.00||10.5||ABB Scanner|
|Porosity||sec/100cc||Grade Dependent||Autoline||Gurley; 5-min 300°F cure|
|Face Cobb||g/100cm^2||0.30||0.80||1.50||T-441||10-min 250°F cure; 3-min 120°F water|
|Bond Cobb||g/100cm^2||0.50||0.70||1.2||T-441||10-min 250°F cure; 3-min 120°F water|
|MD Tensile||lbs/in||-10||BW dependent*||-----||Autoline||5-min 300°F cure|
|CD Tensile||lbs/in||-4||BW dependent*||-----||Autoline||5-min 300°F cure|
|Smoothness Sheffield||SU||350||Autoline||5-min 300°F cure|
|Coefficient of Friction||degrees||Grade Dependent||T-815||Uncured; test 3x, record 3rd value|
|Expansion 180 sec||%||-0.30||BW dependent*||+.30||CD Wet||Uncured; 10” strip|
Surface Quality – Paper shall be uniform in appearance and formation. Examples of defects include, but are not limited to: orange peel, discoloration, tiger striping, streaking, spotting (dirty face), fuzzing, fish hooks, cockles, excessive wire, felt, press roll, or other marking.
Flatness – Paper shall lie flat - free of cockles, edge warp, curling, and grooves.
Holes – Paper shall be reasonably free from holes (no repetitive MD holes). Holes smaller than 3" may be patched (no more than 2 per roll).
Roll Quality – Rolls shall be tightly wound. No telescoping. No wrinkles. No crushed or damaged cores. Splices shall be clearly marked. No splices 1" from the top. Core diameter: 4".
Physical Damage – Paper shall be free from physical defects including, but not limited to tears, edge nicks, excess moisture.
Packaging – Rolls shall be packaged to prevent damage during transport (ex: plastic wrapped). Rolls shall be marked to indicate bond side and labeled with roll number, basis weight, MD & CD tensile strength, top & bond cobb, and porosity.