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Polymeric Coatings Sealants Paint Enamel Varnish Shellacks Stains.

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Presentation on theme: "Polymeric Coatings Sealants Paint Enamel Varnish Shellacks Stains."— Presentation transcript:

1 Polymeric Coatings Sealants Paint Enamel Varnish Shellacks Stains

2 Enamels Not the same as vitreous or porcelain enamel-a glass powder fired in a furnace In paint, it refers to a higher quality paint

3 Sealants Barrier material (protective coating)
Generally weaker than adhesive examples: -Asphalt/coal tar based seal coatings -Anerobic acrylic sealants -silicone coatings on membranes -roof sealants

4 What are roofing sealants? Filled and highly pigmented elastomers
EPDM (ethylene-propylene-diene monomer) rubber (e.g. liquid rubber) Acrylic elastomers Silicones (not very good-often adhesion issues) Polyurethane

5 Methods for applying polymeric Coatings
Powder Spray coatings Electrocoating Fluidized Bed Dip coating Spray coating Spin coating

6 Coatings Market 50+ billion USD worldwide, divided into 3 main segments Architectural: Paints, varnishes, and lacquers for direct application to interior or exterior surfaces of buildings ~50% of total market, but lowest profit margin Generally air-dried Sherwin-Williams, Benjamin Moore, ICI Paints OEM/Product: Applied to equipment in a manufacture process Appliances, cars, industrial machinery, furniture, … ~35% of total market, higher profits Baked, radiation-cured, electrostatic-spray Automotive: PPG, DuPont, BASF Specialty Market: Everything else Auto refinish, traffic marking, … ~15%, usually high-value Air or force dried PPG, DuPont, Akzo Nobel, … OEM = original equipment manufacturer

7 High viscosity coating

8 What is in a can of paint? Solvent Pigments Binder (polymer) Additives
16% Pigments 45% Binder (polymer) 32% Additives 4% Water based paints may have considerably more liquid carrier

9 1 pascal second = 10 poise = 1,000 millipascal second
1 centipoise = 1 millipascal second Formally, viscosity (represented by the symbol η "eta") is the ratio of the shearing stress (F/A) to the velocity gradient (Δvx/Δz or dvx/dz) in a fluid. The most common unit of viscosity is the dyneハsecondハperハsquareハcentimeter [dyne疽/cm2], which is given the name poise [P] after the French physiologist Jean Louis Poiseuille ( ). Tenハpoise equal one pascal second [Pa疽] making the centipoise [cP] and millipascalハsecondハ[mPa疽] identical.

10 Measuring viscosities
10-100,000 cP Requires standards

11 Measuring viscosities
Zahn Cup

12 Newtonian Fluids Newtonian flow paints would also flow away from sharp corners and edges and give significant sagging or curtaining problems when applied.

13 MATERIAL APPROXIMATE VISCOSITY
(in centipoise) 70 F 1 to 5 Blood or Kerosene 10 Anti-Freeze or Ethylene Glycol 15 Motor Oil SAE10 or Mazola Corn Oil 50 to 100 Motor Oil SAE30 or Maple Syrup 150 to 200 Motor Oil SAE40 or Castor Oil 250 to 500 Motor Oil SAE60 or Glycerin 1,000 to 2,000 Karo Corn Syrup or Honey 2,000 to 3,000 Blackstrap Molasses 5,000 to 10,000 Hershey Chocolate Syrup 10,000 to 25,000 Heinz Ketchup or French's Mustard 50,000 to 70,000 Tomato Paste or Peanut Butter 150,000 to 250,000 Crisco Shortening or Lard 1,000,000 to 2,000,000 Caulking Compound 5,000,000 to 10,000,000 Window Putty ,000,000

14 Non-Newtonian Liquids

15 Non-Newtonian Liquids: (Time Independent) Pseudo-Plastic
Pseudoplastic flow can be considered to be a combination of Newtonian flow and plastic flow. As such it combines the properties of these two rheological conditions. At low rates of shear, Newtonian flow properties exist, leading to the possibility of settling, separation and syneresis in the can but excellent flow on application. At higher shear rates, including those at application, plastic flow conditions exist developing the wet film properties associated with plastic flow. molten thermoplastics polymer solutions such as polyethylene oxide in water some paints. shampoo ketchup

16 Many shear-thinning fluids will exhibit Newtonian behavior at extreme shear rates, both low and high. For such fluids, when the apparent viscosity is plotted against log shear rate, we see a curve like this.

17 Shear Thickening (Time Independent) Dilatant
Solids dispersed in liquid Viscosity increases with rate of shear. Some examples of shear-thickening fluids are corn starch, clay slurries, and solutions of certain surfactants. Most shear-thickening fluids tend to show shear-thinning at very low shear rates. Another important type of non-Newtonian fluid is a viscoplastic Dilatancy in a finished paint is not desirable due to its adverse influence on application properties. The high shear rate under application shear stress means that application becomes difficult with the possibility of the paint "powdering" on application and being unable to re-flow after the force has been removed. Corn starch, clay slurries, wet sand (quick sand) surfactant solutions, peanut butter, filled composites

18 Plastic Fluids: have a yield stress threshold
No flow until a critical stress is reacted. Toothpaste Drilling mud Mayonnaise Some paints Grease The yield point associated with plastic flow gives excellent settling, separation and syneresis resistance in the can. However, if the yield point is too high, flow problems can occur on application, lack of flow of application patterns (brush marks, orange peel) is a distinct possibility. If too low, sagging and curtaining become problems Some paints also display viscoplastic behavior. Excellent settling & separation resistance in can Too high yield point: problems applying & orange peel Too low: sagging & curtaining

19 Time dependent Non-Newtonian Viscosity
The viscosity of the fluid is dependent on temperature, shear rate and time.
Depending on how viscosity changes with time the flow behaviour is characterised as:・Thixotropic (time thinning, i.e. viscosity decreases with time) yoghurt, paint ・Rheopetic (time thickening, i.e. viscosity increases with time)-gypsum paste Thixotropic fluids are quite common in chemical as well as in food industry. Rheopectic fluids are very rare.

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21 Polymeric Coatings Coatings are materials that are applied to a surface which form a continuous film in order to beautify and/or protect the surface. Paint: Pigmented surface coating Varnish: Coating that lacks a pigment Lacquer: Thermoplastic solution paints or varnishes, term also used for all clear wood finishes Enamel: Hard, thermosetting paints

22 Paint:Interesting Facts
A jumbo jet needs 2 tons of paint. The world's shipping fleet would produce an extra 70 million tons of greenhouse gasses and nearly 6 million tons of acid-rain-producing sulfur dioxide if ships were not treated with anti-fouling paints

23 Paint Markets

24 Contents of Paint Pigment Provides color and durability
Also improves the strength of the paint Binder Holds the pigment in liquid form When applied it then gives the paint the ability to adhere to the surface. Solvent Effectively thins the paint It carries the pigment and binder Used to regulate how much a paint flows Called a “thinner” when used with lacquer Called a “reducer” when used with enamel

25 Binders: Polymers Thermosets Thermoplastics (latexes) Alkyds Epoxies
Urethanes Formaldehyde resins Alkyds (classic oil paint) Thermoplastics (latexes) Acrylics + other vinyl monomers Vinyls: vinylacetate copolymers with acrylics, vinyl chloride, styrene AFM of latex

26 General Coating Formulations
Method Polymer Solids Polymer Dry rate Min. dry Handling/ Examples M.W structure (no heat) temp Storage Evaporation high (i) low, linear fast no practical good nitrocellulose 10-35% limit other lacquers; solution (solutions) some emulsion (ii) medium paints % emulsion Chemical low medium to crosslinked slow- very slow cans must decorative paints reaction high, moderate in cold be well some stoving between paint 100% weather sealed enamels; and air Chemical low or medium to crosslinked fairly varies; two-pack or industrial stoving reaction very high fast °C short shelf finishes; acid- between low % life, unless catalysed poly- paint stoving or urethane and ingredients radiation polyester wood curing type finishes

27 Desired Rheology of Coatings
Coating viscosity requirements change on passing from the application to drying stages of the process. Application brushing, rolling, spraying processes generate high shear, and favour low viscosity formulations chain orientation and surface imperfections (brush strokes) must be relieved by flow. Film Formation - Drying sagging during the drying process must be countered by low-shear viscosity. Final Coating Properties permanent coating requires near infinite viscosity, through high molecular weight (lacquers) or crosslinking (enamels). h time

28 Solvent-Related Surface Defects
Solvent popping results from rapid solvent evaporation and an inability of the coating to flow. Orange peel patterns result from high film viscosity and/or surface tension gradient induced flow.

29 Coating Formulations: Polymeric Binders
Coatings employ amorphous polymers almost exclusively. Glass transition influences mechanical properties such as flexibility, hardness, etc. Impact resistance is often desired for hard topcoat applications. Consideration of UV, thermal, oxidative stability depends on application (primer, topcoat). Filler/pigment acceptance, surface energy, miscibility in solvents/plasticizers.

30 Binder: alkyd resin Polyester of: Polyol (glycerol) Phtalic acid
Fatty acid Alkyd resin Linseed Linolenic acid Sunflower Linoleic acid

31 Tough Coat® Acrylic Alkyd Enamels

32 Thermosetting Binders: Epoxy and Polyurethane Resins
Epoxy resins are two-component paints formulated from epoxide functionalized monomer and (usually) amine hardeners. Reaction of diisocyanates with diols generates polyurethane coatings whose structure/properties can be varied widely. Polyurethanes afford superiour abrasion and chemical resistance, as well as a fast, low-temperature cure.

33 Polyurethanes Low One part polyurethane Moisture cured polyurethane
Acrylic polyols-aliphatic linear isocyanate two part polyurethanes Polyester polyols-aliphatic isocyanate two part polyurethane High

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35 Thermosetting Binders: Combination
Copolymerization of an acid-functionalized acrylic resin and an epoxy resin yields a crosslinked, block copolymer coating. Anti-corrosive epoxy

36 Epoxy Paints Epoxy coating
Two-component paints are delivered in two units. The curing of the paint begins immediately after mixing, and the paint must be used within a limited period - the so-called potlife. A well known two-component paint is epoxy. Epoxies are extremely water and chemically resistant. They are used e.g. for ballast tanks, exterior hulls on ships, bridges and tanks.

37

38 Thermosetting Binders: Cured Polyesters and Acrylics
Unsaturated polyesters and acrylic resins of low molecular weight can be polymerized by free radical addition chemistry to generate a stable, crosslinked film. Consider a resin comprised of 1,2-propylene glycol, phthalic anhydride and maleic anhydride. Free radical polymerization initiated by an organic peroxide generates a networked structure of high molecular weight by addition through unsaturation in the polymer backbone.

39 Thermosetting Binders: Oxidative Drying Alkyds
While alkyds can be classified as polyesters, the term is reserved for oil-based finishes. Oils are first transformed into monoglycerides: Film formation results from condensation polymerization with diacid as well as oxidative cure.

40 Thermosetting Binders: Oxidative Drying Oils
Coatings containing oil-based films are no longer used as finishes due to poor gloss, soft films and inferiour water resistance. Oils are frequently used in conjunction with other resins to modify drying properties and film structure. Natural oils are extracted from linseed, soya bean, coconut, etc. Unsaturated oils are valued for their relatively rapid oxidative curing n=32,30,28,26 Curing occurs through hydroperoxide formation, followed by alkyl radical combination.

41 Water-based formulations: Emulsions
Emulsion formulations were developed for environmental reasons and for the delivery of very high molecular weight binders. Water is the continuous phase, which results in a very low viscosity coating. Thixotropic agents are required to raise the zero-shear viscosity of the formulation. Most emulsion paints contain some solvent/plasiticizer to modify the Tg of the polymer. Film formation requires coalescence of polymer particles, which cannot occur below Tg. Organic solvents assist with film formation, and evaporate to leave a solid coating. Alternately, a plasticizing agent is used to maintain a flexible film throughout the object’s lifetime.

42 Thermoplastic Binders: Emulsions
Household emulsion paints are usually comprised of poly(vinyl acetate-co-ethyl acrylate) or poly(acrylate-co-acrylic acid) resins pigment is dispersed in the continuous aqueous phase with suitable surfactants and water-soluble thickener. plasticizers or volatile solvents are used to lower Tg such that particle coalescence can function High-gloss latex paints cannot be manufactured, as surface uniformity is generally poor Residual surfactant can lead to inferior water stability of latex derived films. AFM of latex

43 Scaling Concepts in Polymer Physics Cornell University Press, 1979
There once was a theorist from France who wondered how molecules dance. “They’re like snakes,” he observed, “As they follow a curve, the large ones Can hardly advance.” D ~ M -2 de Gennes P.G. de Gennes Scaling Concepts in Polymer Physics Cornell University Press, 1979

44 Thermoplastic Binders: Lacquers
Lacquers harden quickly at all practical temperatures, are supplied in one pack and do not suffer from shelf or pot life problems. comprised of hard linear polymers in solution Cellulose nitrate, a derivative of the natural product cellulose is prepared with varying degrees of modification for different grades: Solubility in esters, ketones and alcohols depends on extent of cellulose functionalization Acrylic lacquers are comprised of homo or copolymers of acrylates, properties depending on polymer composition distribution: Poly(methyl methacrylate) provides hardness and UV stability. Plasticizers and copolymerization alters Tg.

45 Coating Formulations: Solvent Selection Criteria
Solvating Capacity: Miscibility of polymer/solvent systems are dictated by thermodynamics, as approximated by solubility parameters and hydrogen bonding groupings. Viscosity: Influenced by solvating capacity, but also a function of the viscosity of pure solvent and additives. Volatility: Rate of solvent evaporation influences drying time as well as film aesthetic qualities. Decisions often based upon boiling point/range. Toxicity and smell. Cost.

46 Evolution of Solvent-borne Acrylic Coatings
Mw 103 104 105 106 Lacquers 25 % solids 75 % solvent Super-Solids Enamels 75 % solids 25 % solvent High-Solids Enamels 50 % solids 50 % solvent

47 Coating Formulations: Extenders and others
Extenders provide no colour to a film, but their use is an inexpensive method of improving adhesion, ease of sanding, film strength and opacity. Calcium carbonate (whitewash) Aluminum silicate (clay) Magnesium silicate (talc) Barium sulphate (barytes) Silica Viscosity Modifiers silicates, clays, poorly soluble resins Dispersion Aids aid in pigment dispersion - chosen on a case-by-case basis Interfacial Tension Modifiers non-ionic surfactants, soaps Biocides insecticides, fungicides

48 Coating Formulations: Pigments
Pigments are selected on the basis of: Particle size Particle shape Refractive Index Tinting strength Lightfastness Hiding Power Thermal Stability Chemical Reactivity Density (cost) Property Preference Reasons (1) Brilliance and Organic The most attractive, cleanest colours clarity of hue are obtained with organic pigments. (2) White and Inorganic The purest white pigment is TiO2 black paints and the most jet black, carbon. (3) Non-bleeding Inorganic Inorganic compounds have negligible solubilities in organic solvents. Some organics are very insoluble. (4) Lightfastness Inorganic Inorganic compounds are generally more stable to UV than organics. (5) Heat stability Inorganic Very few organic compounds are stable above 300°C.

49 Aesthetic Properties of Dried Film Coatings
Opacity Extent of substrate coverage, as determined by pigments, extenders and other occlusions in the film. Dependent on refractive index of fillers relative to the polymeric binder. Surface Finish Gloss is a function of surface irregularity, as determined by the film formation process and dispersion of pigments/fillers. Color Inorganic and organic colourants that are soluble or dispersed in the film (may or may not provide opacity).

50 Thickeners are large water-soluble polymers added to a paint to increase its viscosity. Viscosity can be defined as the resistance of a liquid to flow. This property is important for a paint for several reasons: so the paint can flow out of the can so the paint can be applied to a substrate (glass, wood, steel, etc) using a paint brush or a roller. so the paint does not splatter or drip on the user so no brush marks can be seen to prevent settling of the paint in the can during storage so that a "good" film can be formedlm can be formed

51 Engineering Properties of Dried Film Coatings
Hardness Impact (& Chip) Resistance Flexibility Abrasion Resistance Solvent Resistance Adhesion Tests: Indentation, Scratch (Pencil) Drop tests, Gravelometer Elongation, Bend Falling sand test MEK (methylethylketone) double rub Scraping, Crosscut Adhesion Issues: Properties are a complex function of many factors: Tg, MW, crosslink density, pigmentation, static stress-strain behaviour, transient (creep) behavior What do you test? Free films? Coating with substrate? Weatherability and UV resistance – How does it hold up over time?

52 Coating processes: Coil Coating
•Coat sheet metal from coils before shaping • Calendar or knife delivery • Also electrocoat & spray

53 Coil Coating

54 Spraying (charged particles)
Curing (Infrared oven)

55 Powder Coating High-gloss finish Uniform coat Durable coat
Color selection Pollution-free Recycle powder Short cure times

56 polyester melts TGIC diffuses
cold substrate substrate heated cross-linked electrical adhesion polyester melts TGIC diffuses solid film

57 Powders used in Spray Coating
Epoxies-More durable, but more light sensitive (chalking) Polyesters-More light stable Polymer Binder + Pigment + Filler + Antioxidant

58 Applications: OEM

59 Preparing the Coating Powder

60 The crosslinking during the cure

61 Powder Coating versus Paint
no solvent (toxic) solvent recycles unused coating overspray wasted single layer sufficient several layers required conflicting flow requirements viscosity adjusted separately now dominates for coating of parts

62 Thermal Spray Rod Wire Powder Feedstock Materials Heat Source
Acceleration Impact Splatting & Cooling

63 Powder coating wood °C IR heating

64

65 There are 4 key stages in the manufacture process of powder coatings:
1. Formulation The formulation of powder coatings involves the use of 4 key raw material types: resins, pigments, curing agents and additives. Resins provide strength, durability and adhesion; pigments add color; curing agents ensure that the resins bond to the substrate and harden, and additives give further coating properties such as enhanced application, improved flow, etc. 2. Premix Once a product has been formulated, raw materials are carefully weighed and measured. These raw materials are then blended together, either by mixing or tumbling, to ensure a consistent dispersion of raw materials throughout the mixture. 3. Extrusion The mixed raw materials are then fed into an extruder. The extruder applies pressure and heat to melt the resins and thoroughly incorporate the pigments, curing agents and other ingredients into a homogenous substance. The extrudate is then cooled and chipped. 4. Grinding Once the extrudate has been cooled and chipped, it is ready to be ground into a fine powder. This powder is then sieved and classified to ensure an even particle size distribution. Particles that are under 10 micrometers or over 120 micrometers can cause application problems and are restricted by the sieving and classification process.ication process.

66 Epoxy powder coated podium
Powder coatings have several significant advantages over solvent-based liquid paints: No solvents - Liquid paints can contain up to 70% solvent. Powder coatings contain no solvents, and therefore eliminate solvent release into the environment. Recyclable - Oversprayed powder can be reclaimed and reused, allowing up to 95% material utilization, reducing waste Fewer variables in film properties - The more uniform properties of powders and the elimination of thinners and solvent balancing lead to a more consistent paint film in just one coat.n just o Powder Coating was invented in the 1950's. It is a method of finishing a metallic surface by the application of dry powder. When the powder is fused to the metal with a heat source, the coating forms a continuous and integrated bond with the substrate. Initially, only thermoplastic resins were used in a fluidized bed application system. The development of thermosetting epoxy, polyurethane & polyester resins in the 1960's and 70's, combined with new spray application techniques opened up a much wider segment of the metal finishing industry to powder coatings.

67 Electrocoating or E-coat
The Electrocoating Process... • Precipitation of paint particles
onto a metal substrate
 • Highly efficient and automated process
 • Paint deposition is regulated by
voltage
 • Coating can be either anodic or
cathodic • Thermoset curing Electrocoating is an immersion painting process in which charged paint particles are attracted to an oppositely charged metallic surface. As the paint is deposited, it forms a finish which begins to insulate the metal from the surrounding charged solution. Deposition continues until the coating thickness becomes sufficient to form a barrier against further paint attraction. In anodic electrocoating, the part to be coated is the anode with a positive electrical charge which attracts negatively charged paint particles in the paint bath. During the anodic process, small amounts of metal ions migrate into the paint film which limit the performance properties of anodic systems. The main use for anodic products is interior or moderately exterior environments. Anodic coatings are economical systems that offer excellent color and gloss control. 

In cathodic electrocoating, the product has a negative charge, attracting the positively charged paint particles. Cathodic electrocoat applies a negative electrical charge to the metal part which attracts positively charged paint particles. Reversing the polarities used in the anodic process significantly reduces the amount of iron entering the cured paint film and improves the cathodic properties. Cathodic coatings are high-performance coatings with excellent corrosion resistance that can be formulated for exterior durability. PPG

68 E-Coat: Anodic Coatings
Anode has a positive charge that attracts the negatively charged polymers Epoxies (cure >80 °C) Acrylics (cure > 150 °C) Acid-modified polybutadiene Butylated-formaldehyde-melamine (150 °C)

69 E-Coat: Cathodic Coatings
Cathode has a negative charge that attracts the positively charged polymers Epoxies (cure >190 °C) Acrylics (cure > 190 °C)

70 • Corrosion resistant cationic epoxies
• High edge coverage for sharp objects • Solvent free anodic products • Cathodic acrylics with corrosion resistance and excellent exterior durability • Near 100% transfer efficiency operation • Two-coat Electrocoat for severe environments • Heavy-Metal free formulations • HAPs free formulations • Electrodepositable Photoresists Agriculture Equipment, Appliance, Automotive, Fasteners, Metal Office Furniture, Printed Circuit Boards, Structural Steel, Wheels, Railway

71 PPG

72 Automobile Painting

73 Fluidized Bed Coating Heat part, then dip into FB coater
Polymer powder in air generated fluidized bed Normal or electrostatic FB coater PVC, polyethylene copolymers Protective, decorative coatings Safety glass bottles Fluidized Bed
For fluidized-bed dipping, preheat parts to 400シF. Dip parts in fluidized-bed of Glas-Lok for 4-6 seconds. Carefully blow off excess powder. For improved surface finish (if necessary), parts may require post-baking for a short period of time.Electrostatic Deposition
For electrostatic deposition, preheat parts to 400シF. Deposit Glas-Lok 8-12 mils thick. For improved surface finish (if necessary), parts may require post-baking for a short period of time. Heat part, then dip into FB coater 100 °C for PE copolymer

74 Fluidized Bed Coatings
Fluidized Bed
For fluidized-bed dipping, preheat parts to 400シF. Dip parts in fluidized-bed of Glas-Lok for 4-6 seconds. Carefully blow off excess powder. For improved surface finish (if necessary), parts may require post-baking for a short period of time.Electrostatic Deposition
For electrostatic deposition, preheat parts to 400シF. Deposit Glas-Lok 8-12 mils thick. For improved surface finish (if necessary), parts may require post-baking for a short period of time. A part recently taken out of a fluid bed coater with about 10 mils of functionalized polyethylene applied. Photo courtesy of Wright Coating Company, Kalamazoo, MI.

75 Dip Coating PVC

76 CVD: Parylene Coating 1947, Michael Mojzesz Swarc

77 CVD Polymerization Gas phase Polymerizes on contact Conformal coatings
Pinhole free Preserving artifacts (paper) Microelectronics Medical devices

78

79 Polyxylylene Parylene C
The most widely used dimer, providing a useful combination of properties, plus a very low permeability to moisture, chemicals, and other corrosive gases. Parylene N Provides high dielectric strength and a dielectric constant that does not vary with changes in frequency. Best selection where greater coating protection is required. Parylene D Maintains its physical strength and electrical properties at higher temperature

80 CVD Polymerization Parylene is the generic name for poly-para- xylylene, a completely linear, highly crystalline material Vapor Deposition in Vacuum (conformal coating) Excellent Dielectric (> 5000 V/mil) Excellent Strength (Yield & Tensile strength > 8000 psi) Highly stable (Insoluble in most Solvents) Biocompatible Water absorption (<0.1% in 24hrs) The required thickness of a coating can vary based on the application, but thickness can range from the hundreds of angstroms to several mils, with the typical coating being in the microns range.

81 RF Plasma Source Developed by Plasmionique
Capacitive Coupling Inductive Coupling PECVD coatings from Hydrocarbon gases DLC Hard Coatings on Various materials Polymeric Coating on Various materials Studied The bias energy Impact on Film properties

82 Eight Steps of Photolithography
8) Develop inspect 5) Post-exposure bake 6) Develop 7) Hard bake UV Light Mask 4) Alignment and Exposure Resist 2) Spin coat 3) Soft bake 1) Vapor prime HMDS

83 Spin Coat Process Summary: Wafer is held onto vacuum chuck
Dispense ~5ml of photoresist Slow spin ~ 500 rpm Ramp up to ~ 3000 to 5000 rpm Quality measures: time speed thickness uniformity particles and defects Vacuum chuck Spindle connected to spin motor To vacuum pump Photoresist dispenser

84 Multilayer Saran

85 Applications Monolayer
Sausage packaging Cheese packaging Lamination films耀‚ꁴ


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