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Polypropylene Film

Surface Treatment of Polypropylene Films for Printing and Coating

Polymers generally, but notably polyolefins, have low surface energies and it can be difficult for inks and other coatings to adhere to them. In the case of polyolefins, such as polypropylene (PP), the problem is particularly severe since this polymer has a surface void of polar groups. Thus, only weak physical (dispersion-force) interactions can bond materials such as printing inks to the surfaces.

An additional problem arises in polyolefins caused by their wide molecular weight distribution. The surfaces of polymers such as PP are preferentially made up of low molecular weight chains, creating a cohesively weak boundary layer. Even if strong bonding occurs between polymer and a coating, such as printing ink, the weakness of the boundary layer will lead to easy destruction of the applied ink. Therefore the surface of PP must be treated prior to coating and the success of those surface treatments have to meet a dual challenge:

1) To introduce polar groups into the polymer surface, thereby bringing into play strong, non-dispersive, forces which strengthen the bond with applied agents, e.g., inks

2) To strengthen the cohesively weak boundary layer

There are three basic polypropylene resins: rigid homopolymers, impact grade block copolymers, and random copolymers. Two of these are used in film applications. The homopolymers for biaxial oriented PP (BOP) film and random copolymers for softer, non-oriented films. The homopolymer PP have a high melting point near 160°C. The random copolymers, based on ethylene and butane-1, have much lower melting ranges overlapping those of polyethylene and its copolymers.

To aid the processing of these films, surface lubricants are added, also called slip additives. These additives are typically amides and the common ones used are stearamide, oleamide, behenamide, and erucamide, with the latter being the industry preference. The levels at which slip additives are blended into a polyolefin resin is critical. Depending on final film gauges, the levels can range from 600 to 1800 ppm.

Slip additives are blended on a weight percentage basis. If two films of different gauges are extruded from the same resin, the thicker film may experience overcrowding of slip additives on the surface and multi-layer formation. If too much slip additive migrates to the surface, this can have an adverse effect on surface treatment. Some of the energy for the surface treatment will instead be spent on vaporizing or oxidizing the additives, thereby leaving a surface that is not yet suitable for printing or coating.

These additives must be treated as a precursor to printing, laminating, or metallizing. The treatment required is specific to each application. For printing, the problem is being compounded by the industry trend away from solvent-based inks towards water-based or UV curable inks.

Water based inks are still in the process of development. Some of the ingredients now in use may be replaced with new ones. The use of acrylics, as well as hybrid binders, will remain strong; binders that do not require amines will be more desirable. Water based inks are complex formulations of chemicals and additives. With future changes in environmental regulations, some of these may be restricted.

About the Author

This is a summary of an annual strategic report on aluminum anodizing technology written by Guideline staff and experts. For more information please visit us at
www.intota.com
, or contact Brian Reuter, Director of Product Realization, breuter@guideline.com.

1200VDC 800VAC 50KHz 0.3uF Polypropylene Film Capacitor $5.20

CBB61 8uF 5% Polypropylene Film Fan Motor Run Capacitor $4.50

0.1uF X2 Safety Standard Polypropylene Film Capacitor $9.10

630V 0.001uF 102J 10nF Polypropylene Film Capacitor 10 Pcs $7.14

5uF DC 400V Polypropylene Film Capacitor for Induction Cooker $6.47

Polypropylene Film Air Conditioner Motor Capacitor 70uF $19.72

CBB65 450 VAC 50 uF MFD Round Polypropylene Film Capacitor $18.97

CBB61 4uF Motor Metallized Polypropylene Film Capacitor $4.27

25 NEW radial .1uF 275VAC 275V volt metalized polypropylene film capacitors $4.99

CBB60 Polypropylene Film Motor Run Capacitor 450VAC 8UF $7.51

CBB22 DIP Polypropylene Film Capacitor 2.2uF 225J 400V 10 Pcs $9.65

450V 10uF Polypropylene Film Motor Run Start Capacitor $5.40

Motor Start up 20uF 450VAC Polypropylene Film Capacitor $12.18

8uF 5% 450V AC CBB60 Polypropylene Film Motor Start-up Capacitor $6.94

1.5uF 450VAC Fan Polypropylene Film Motor Run Capacitor $4.03

35uF AC450V Motor Starting Polypropylene Film Capacitor $10.65

5uF DC 400V Polypropylene Film Capacitor for Induction Cooker $9.40

8uF 5% 450V AC CBB60 Polypropylene Film Motor Start-up Capacitor $6.40

3uF AC 450V Metalized Polypropylene Film Motor Run Capacitor $4.44

10pc copper lead Metallized Polypropylene Film Capacitor .001uF 630V fr tube amp $5.99

0.047uF 10% Polypropylene Film Safety Capacitors 10 Pcs $3.91

CBB22 630V 0.047uF 5% DIP Polypropylene Film Capacitors $3.78

MPX 0.033uF Polypropylene Film Safety Capacitors 10 Pcs $5.05

Air Conditioner Motor Run Polypropylene Film Capacitor AC 400V 8uF CBB61 $6.74

CBB65 35uF 450VAC Metallized Polypropylene Film Motor Capacitor $15.43

(10) 0.56uF 180VAC/250VDC MKP10 5% WIMA Polypropylene Film Capacitor Capacitors $11.99

0.1uF 5% 1000V Metallized Polypropylene Film Capacitors $4.64

CBB60 Polypropylene Film Motor Capacitor 12uF 450VAC $7.38

40uF Washing Machine Polypropylene Film Motor Capacitor $13.03

(25) Vishay 0.027uF 630V MKP/MKP-378 Polypropylene Film Capacitor Fresh RoHS $7.99

Motor Running 30uF AC450V Polypropylene Film Capacitor $11.35

450V 1.2uF Polypropylene Film Motor Run Start Capacitor $4.02

630V 0.22uF 5% Metallized Polypropylene Film Capacitors $3.61

16uF CBB60 Polypropylene Film AC Motor Start Capacitor $9.29

X2 Regulation DIP Polypropylene Film Capacitor 100 Pcs $9.35

CBB22 400V 0.1uF DIP Polypropylene Film Capacitor 10pcs $7.14

Polypropylene Film Wired 30uF AC 450V Motor Capacitor $12.49

Polypropylene Film Wired 30uF AC 450V Motor Capacitor $12.19

CBB60 Polypropylene Film Motor Run Capacitor 450VAC 20UF $13.13

Polypropylene Film Round Motor Run Capacitor 5/45 5+45 uF 450VAC $14.95

20uF Polypropylene Film AC450V Motor Running Capacitor $9.80

450V 2.5uF Polypropylene Film Motor Run Start Capacitor $4.23

Metallized Polypropylene Film AC 450V 25uF Motor Run Capacitor CBB65A-1 $11.44

Polypropylene Film Round Motor Run Capacitor 5/45 5+45 uF 450VAC $14.97

1.5uF 450VAC Fan Polypropylene Film Motor Run Capacitor $4.06

Polypropylene Film Motor Start Run Capacitor 1.8uF 400VAC $3.53

CBB60 AC 450V 25uF Washing Machine Polypropylene Film Motor Capacitor $9.21

CBB22 DIP Polypropylene Film Capacitor 2.2uF 225J 400V 10 Pcs $6.84

450V 4uF Polypropylene Film Motor Run Start Capacitor $4.16

30uF 400VAC 50Hz Polypropylene Film Motor Run Capacitor $13.20

HP EVERYDAY MATTE POLYPROPYLENE, 610 MM X 30.5 M ( $201.59 HP Everyday – Matte polypropylene film – Roll (24 in x 100 ft) – 120 g/m2 – 1 roll(s) (pack of 2 )

PAPER,MATTE POLY 36X200′ $291 Everyday Matte Polypropylene Roll Film, 120 g/m2, 2 Core, 36 x 200 ft, White

PAPER,MATTE POLY,36X100 $155 Everyday Matte Polypropylene Roll Film, 120 g/m2, 2 Core, 36 x 100 ft, White

PAPER,MATTE POLY,60X100 $258 Everyday Matte Polypropylene Roll Film, 120 g/m2, 2 Core, 60 x 100 ft, White

POLYPROPYLENE FILM MATTE-2PK 36INX100FT ROLL Z6100 $155 HP – Matte polypropylene film – Roll (36 in x 100 ft) – 120 g/m2 – 1 roll(s) (pack of 2 )

SELF ADHESIVE GLOSS-POLYPROPYLENE 42 $99.75 HP Self-adhesive Gloss Polypropylene – Self-adhesive glossy polypropylene film – 5.5 mil – Roll (42 in x 75 ft) – 120 g/m2 – 1 roll(s)