Speciality Grades

Surface-Sizing Mold-Releasing PVOH

P-7000 SERIES

The P-7000 SERIES are mold-releasing PVOH whose qualities have been optimized as special surface sizing agents for paper and board. The products not only have excellent membrane properties unique to PVOH but also prevent paper from sticking to machinery, eliminating the need for a release agent.

Properties

・Excellent solubility (no lumps of undissolved powder, or generation of fine powder dust).
・Minimum foaming, and good workability.
・No need for wax, emulsion etc as a remover, reducing costs.
・No need for wax leads to avoid paper slippage. The paper produced will have good bonding properties.

Product Grade	Properties
Gohsenal P-7000	Mold-releasing PVOH, with the strongest paper strength improvement of the P-7000 series.
GOHSESIZE P-7100	Standard mold-releasing PVOH

Example of Experiments of Thermal Degradation
Product Grade	Viscosity (cps)	Saponification Degree (mo1 % )	pH	Volatile Matter ( % )
P-7000	27.0~32.0	99.0 or higher	6~8	8 or less
P-7100	25.0~30.0	98.0~99.0	5~7	5 or less

Dissolving and Storage of P-7000: Any product from the P-7000 SERIES can be readily dissolved in cold water or warm water (50 degree C or lower). To dissolve P-7000, add to the necessary amount of water, and stir until fully dispersed. Heat the solution to 80 to 90 degree C and keep at this temperature, while stirring, for 0.5 to 1 hour.
A typical, concentration is 5 - 10%, depending on the intended applications. Even when stored for an extended period, aqueous solution will never deteriorate or putrefy.

Applications of P-7000

P-7000 SERIES : products can be used as a surface sizing agent for any type of paper. However, their effects are maximized with the paper types described below.

・Printing stocks (generic printing stock, base paper for coated paper)
Improvement in paper strength and printability for generic wood free paper, printing stock B per JIS P 3102, and gravure paper.
Improvement in paper strength and coatability for base paper (for coated paper).
・Various boards (high-quality patent-coated board, white board, linerboard)
Improvement in abrasion resistance, oil resistance, smoothness, and surface gloss.
・Wrapping paper (craft paper, etc.)
Improvement in paper strength, in particular, folding resistance; oil resistance, and improvement in printability.

Typical Operation with GOHSESIZE P-7000 SERIES:

Surface Sizing of Liner(operation on the site)
	GOHSESIZE P-7100 1.5 %	GOHSENOL N-300 1.5 % (together with wax emulsion)
Cobb size degree　g/m²	75	70
Abrasion strength　Cycles	140	110
Oil absorptiveness sec	100	110
Denison wax A	18	16
Slip angle Tθ゜	26.2	23.8
( Static )　Yθ゜	26.8	26.2

Base stock:K-liner (basis weight 320g/m² )
Line speed:Approx 300m/min
Coating:Calender coating

Back Coating for White Board(operation on the site)
	GOHSESIZE P-7000 1.5 %	GOHSENOL N-300 1.5 % (together with wax emulsion)
Denison wax A	18	16
Cobb size degree g/m²	26	30
Abrasion strength mg	68	92
Smoothness sec	32	27
Slip angle (static)　Tθ゜	21	18

Base stock:Coated white board(basis weight 420g/m² )
Line speed:Approx 90m/min
Coating:Calender coating

Surface Sizing for Thin Paper(operation on the site)
	GOHSESIZE P-7000 1.5 %	GOHSESIZE P-7000 2 %	GOHSENOL N-300 1% Starch 1 %
Size degree sec	2.1	3.0	2.2
Oil absorptiveness sec	39	63	57
Denison wax Right side A	10	12	8
Wrong side A	14	14	12
Air permeability sec	330	690	530
Folding endurance Cycles/10kg	35	46	24

Base stock:Photocopy paper (basis weight 40 g/m²)
Line speed:Approx. 200 m/min
Coating:Size press

Surface Sizing for Wood Free Paper(operation on the site)
	GOHSESIZE P-7100　2.7 % Starch　2.7 %	Starch　8 %
Size degree sec	32	36
Denison wax Right side A	12	12
Wrong side A	16	14
Pen drawing size Right	A	A
Wrong side	A'	A'
Smoothness Right side sec	39.9	34.7
Wrong side sec	39.7	30.7
White paper gloss Right side %	11.7	10.2
Wrong side %	13.2	11.2

Base stock:Printing stock A(basis weight105g/m2 )
Line speed:Approx. 200/min
Coating:Size press

In any of the above-mentioned examples of operation on the site, production tests were performed for several hours or continuously. As a result, no fouling was found on the calender rolls or after dryer.