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Speciality Grades
Surface-Sizing Mold-Releasing PVOH

GOHSESIZE P-7000 SERIES

The GOHSESIZE 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. GOHSESIZE P-7300 contains a rust preventative for use with metal rolls.

  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.
• P-7300 has a rust preventative effect which can prevent rust on the rolls. Rust will not be transferred to, for example, labels on canned foods.


Product Grade
Properties
GOHSESIZE P-7000
Mold-releasing PVOH, with the strongest paper strength improvement of the P-7000
series.
GOHSESIZE P-7100
Standard mold-releasing PVOH
GOHSESIZE P-7300
Mold-releasing PVOH having rust-preventive effect


Example of Experiments of Thermal Degradation
Product Grade
Viscosity
(cps)
Saponification Degree
(mol%)
pH
Volatile Matter
(%)
Ionicity
Functions
P-7000
27 ~ 32
99 or higher
6 ~ 8
8 or less
Anion
Mold-releasing property
P-7004
27 ~ 32
99 or higher
6 ~ 8
8 or less
Anion
Penetrability
P-7100
25 ~ 30
98 ~ 99
5 ~ 7
5 or less
Nonion
Mold-releasing property
P-7200
25 ~ 30
98 ~ 99
5 ~ 7
5 or less
Nonion
High defoaming property
P-7300
25 ~ 30
98 ~ 99
5 ~ 7
5 or less
Nonion
Mold-releasing property
Rust preventive property
P-7400
25 ~ 30
98 ~ 99
5 ~ 7
5 or less
Nonion
Mold-releasing property
Rust preventive property
Anti-slipping property




Dissolving and Storage of GOHSESIZE P-7000 :
Any product from the GOHSESIZE P-7000 SERIES can be readily dissolved in cold water or warm water (50 degree C or lower). To dissolve GOHSESIZE P-7000, add GOHSESIZE 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 GOHSESIZE solution will never deteriorate or putrefy.




Applications of GOHSESIZE P-7000 :
GOHSESIZE 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 for 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 320 g/m²)
Line speed
Approx. 300 m/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 420 g/m²)
Line speed
Approx. 90 m/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 weight 105 g/m²)
Line speed
Approx. 200 m/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.