Two-component solvent type adhesive for food packaging
HIPOL PA-308/HH-75
PA-308 is two-component type adhesive of polyurethane bases for food packaging.
The hardener HH-75 is used in combination, when dry lamination process, PA-308 has excellent adhesive strength to a wide variety of substrates including OPP, PET, NYLON, Cellophane, PS, PVC, AL foil, LLDPE, CPP, PAPER, metallized and PVDC coated film, etc.
And it especially provides excellent performance for retort food packaging caused by good adhesive strength and outstanding thermal resistance.
Besides PA-308 has a good performance as A.C(Anchor Coating) agent for Extrusion Lamination.
1. Typical properties
|
ITEM |
PA-308 |
HH-75 |
|
Appearance |
yellowish transparent liquid |
|
|
Non-volatile(%) |
59 ~ 61 |
74~76 |
|
Viscosity(cps, 25C) |
2,000~4,000 |
1,000~2,000 |
|
Dilution Solvent |
Ethylacetate |
|
2. Recommended mixing ratio
|
Classification |
Component |
DRY LAMINATION |
ANCHOR COATING |
|
Adhesive |
PA-308 |
18 |
18 |
|
Hardener |
HH-75 |
2 |
4 |
|
Solvent |
EA |
20 |
70 |
|
N.V(%) |
|
30.8 |
15 |
|
Viscosity(sec.) |
Zahn cup #3 |
9.3 |
7.3 |
3. Applications
|
Application |
Packaging composition |
|
POUCH(for General) |
PET or NYLON/LLDPE, PET/NYLON/CPP |
|
AL POUCH |
PET/AL/LLDPE, PET/AL/CPP, PET/AL/NYLON/CPP |
|
RETORT POUCH |
PET/AL/CPP, PET/AL/NYLON/CPP, PET/NYLON/AL/CPP |
4. Recommended operating conditions for lamination
1) DRY LAMINATION
- Dry chamber temp. : 70~90C
- Cylinder : 100~130lines/inch (about 9g~12g/, wet)
- Line speed : 60~80m/min.
- Aging : 48hrs at 50C aging room.(pouch and AL pouch)
96hrs at 50C aging room.(boil and retort pouch)
- Nip roll temp. : 60~100C
- Cleaning solvent : Ethylacetate, M.E.K
2) EXTRUSION LAMINATION(T-DIE)
- Dry chamber temp. : 70~90C
- Cylinder : 175lines/inch (about 6g/ wet)
- Line speed : 60~100m/min.
- Aging : 48hrs at 50C aging room.
- Cleaning solvent : Ethylacetate, M.E.K
5. Influence of mixing ratio
Since PA-308 is reacted with HH-75 and is hardened, The peeling strength appears differently by mixing ratio.
The peeling strength is not so much affected if the deviation from the recommended mixing ratio is within 5~10% and no problems would be caused if it is used normally.
And a hardening is in proportion to aging temperature and aging time.
6. Influence of coating amount
If the coating amount which is coated on films too small,the appearance is not clear or bubble mixing, floating, roll mark, other defective appearances may be caused.
And the peeling strength is not enough either. On the other hand, if the coating amount is too much, such appearance troubles as the tunneling, blur, shrinkage, wrinkle, etc. may be resulted.
Generally speaking, the coating amount, 3.5~4g/(dry) could be recommended to obtain
excellent adhesive property.
7. Influence of aging conditions
Since PA-308 is the reactive type, a appropriate aging time and temperature is needed to reach
the maximum peeling strength after the lamination.
An appropriate aging time and temperature refers to an item 4.
8. Influence of applied Films
The peeling strength makes a difference according to each films.
Even if the source materials of the films are same, their peeling strengths can be quite different. It is because that the corona treatment or surface of the films are minutely different
according to manufactures and production facilities.
Therefore, you must sufficient lab test with films and adhesives before begin operating.
9. Packaging & storage
|
Classification |
PA-308 |
HH-75 |
|
Net wt.(kg) |
18 |
20 |
|
Storage |
room temperature |
room temperature |
|
Term of guarantee |
6 months |
6 months |
10. Caution on use
1) Since this adhesive contains inflammable solvent, please pay attention to heat of fire.
2) You should not reuse the remain adhesives(mixed adhesives) after use.
3) Recommended operating conditions as an item 4. can be in different with your operating conditions.
4) Please give attention to temperature, humidity after mixing adhesive and hardener.
5) Please, store this adhesive at a place where cool and dry.
6) Please read the MSDS document carefully before use.
