Material Construction & Properties 1

8/14/2019 Material Construction & Properties 1

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Material Constructions&

Properties

For Training Purpose Only


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Material Constructions

Main

layers

Optional

layers


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It can be 1 layer, 2 layers,

3 layers, 4 layers or moredepend how you interprets

it


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The basic label construction consists of 4 layers:the facestock, adhesive, release coating, and the liner.


1)Facestock

-is the uppermost layer of a label construction. This layer iswhere printing and/or writing is usually done on.

-When selecting a facestock, one should consider service

environments, label comformability, label dispensability,

print quality and durability as key considerations.


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2)Adhesive

-is a sticky substance which bonds the label (facestock)

with the substrate.-Factors influencing selection of an adhesive include

application conditions, substrate material type, service

environment, and removability.

3)The release coating

-is usually a silicone based coating between the liner and the

adhesive.

-It allows the facestock to seperate smoothly from the liner.

-A smooth and consistent release force are a very critical

factors for high speed converting and stripping, as well as

for automated label dispensing processes.


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4)The liner

-is the lowermost layer of a label construction which

serves as label carrier for converting, printing and

dispensing.

-It also serves as a base for die-cutting. The liner

determines the flatness of the label.


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Types of Material

1. Pressure Sensitive Labels- have facestock, adhesive & liner

2. Double sided Tape

- have adhesive & liner

3. Liner

- have 1 layer of liner only

4. Material only

- have 1 layer of material only


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Properties of Facestock Material

1. Paper low cost, indoor, packaging2. Polyester(PET) - synthetic polymer, resistance to

moisture & temperatures

Polypropylene - Highly durable and resistant to mostacids

PVC(Vinyl) - very versatile and durable, resistance

to solvents, moisture, scuffing and UV exposure.

Polymide - ideal for high temperature applications

and suited for printed circuit board (PCB) barcode

labels.


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Properties of Adhesive

Rubber Economical, short-term adhesive with good initial

bond, suitable for indoor use. Rubber pressure sensitiveadhesives have minimal chemical, heat and UV resistance

and break down over an extended period of time.

Acrylic Extremely stable bond that strengthens over time (see

diagram below) and works well with most surfaces. Acrylic

pressure sensitive adhesives have exceptional chemical,

heat and UV resistance and are suitable for both indoor and

outdoor use.

Silicone Exceptional stability through a wide range of

temperatures with excellent ozone and oxidation resistance.

While less economical, silicone pressure sensitive

adhesives are recommended for high temperature and

cryogenic applications for exceptional reliability.


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Properties of Liner

Paper Used when particulation is not an issue

Typically silicone coated for easy label removalGenerally manufactured from kraft paper

Available bleached or unbleached and coated or uncoated

Synthetic Available as silicone free, standard (clear), safety(colored) and ESD

Used primarily in cleanroom environment

Available in polyester, polypropylene, polystyrene,

polyethylene and polyolefin

Do not work well with permanent adhesives

Available with textured surface for anti-static applications

Both paper and synthetic liners are available in different

thicknesses.


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When choosing a label product, always ask yourself

these eight questions:

1. Do I need a permanent or removable label?

2. What is the composition of the substrate which I would apply

the label on?

3. What is the texture of the surface of the substrate?

4. What is the shape of the surface? (Circular, flat, etc.)5. Is the application surface clean or contaminated?

6. Is there a possibility of migratory inhabitation of components

on the substrate?

7. What are the printing/imprinting and convertingrequirements?

8. Are there special environmental factors which should be

considered? (e.g. Extreme temperatures, UV exposure,

outdoor weathering, sterilization, etc.)


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Example of Materials

Material Construction & Properties 1

Documents

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