1. Product Range
Release Base Papers

2. 3 2 1 Release Base Papers Face Stock Adhesive Release Liner
Silicone
Coating 1
Release Liner
Release Base Paper + Silicone Coating

3. Release Base Papers Main Applications
Pressure Sensitive Laminates in reels for industrial application of primary labels
Double side Adhesive tapes
Carriers and Interleaves
Retail Pricing, Tagging
Corrective tapes ...
Silca
Supercalendered base papers for Silicone coating
Silco
Clay Coated base papers for silicone coating
Pressure Sensitive Laminates in sheets
Office Products, VIP Labels
Laminates in sheets for graphic, promotional, plotter applications
Sanitary products
Self Adhesive Envelopes

4. Release Base Papers Making and Properties
Silicone hold out is obtained through chemical treatment of the surface and subsequent off-line Supercalendering
The pressure and friction of SuperCalender cylinders delivers high density, smoothness and transparency to the paper
Silca
Supercalendered
base papers
(glassines)
Silco
Clay-Coated
base papers
Silicone hold out is obtained through the application of one or more coating layers
Coating is applied still on the Paper Machine (on-line coating)
The paper results opaque, bulky and has good lay-flat

5. 1 Release Base Papers Making and Properties
Silca Supercalendered base papers (glassines)
Refining of cellulose fibers is the first important step of glassine making
This process developes many fibrils from the cellulose fibres, increasing the ability to create bonds among them, and increasing the number of those bonds.
This will result in a higher resistance (tensile strength) of the paper and in a lower porosity of the paper surface 1

6. 2 Release Base Papers Making and Properties
Silca Supercalendered base papers (glassines) 2
Surface Treatment through the application of chemical additives increases the surface hold-out and the anchorage of silicone.
the treatment is applied on the paper machine, when the paper web runs throught a Size-Press

7. 3 Release Base Papers Making and Properties
Silca Supercalendered base papers (glassines) 3
Supercalendering is the most important process influencing the characteristics of glassine
It is an off-line process
Paper is first heavily re-moisturised
Then it goes through couples of high temperature metal and rubber cilinders
Pressure, Temperature and Friction of the cilinders produce smoothness of the surface, high density and high transparency

8. Applications needing a Supercalendered Base Paper
Primary Labels of food, household products and durable goods
Adhesive Tapes for household and industrial applications
Interleaves, Soundproof and Insulating materials for use in various industrial sectors
Specialty Applications

9. Applications needing a Supercalendered Base Paper
Primary Labels of food and beverages, cosmetics and other household products are carried in reels through printing, cutting and dispensing, by a silicone coated release liner.
Requirements: high smoothness for silicone hold-out; high density and even thickness for accurate die cut; high transparency for photocell detection
Silca Label A range of supercalendered base papers for silicone coating designed to meet those specific needs.
·         57 – 80 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

10. Applications needing a Supercalendered Base Paper
Liners for Primary Labels
Glassine
- Silicone coat
- Adhesive coat
- Laminate
- Print
- Die cut
- Remove matrix
- Apply

11. Applications needing a Supercalendered Base Paper
Die Cutting
Flat Bed rule cutting die
Rotary solid cutting die
Rotary Sheet cutting die

12. Applications needing a Supercalendered Base Paper
Die Cutting
Target: cut the label and the adhesive without cutting or damaging the silicone coated liner. Dies are set upon the expected thickness of the liner
die
Requirements for the liner:
Even thickness , low std deviation
High density (ability to be compressed )
Ideal density between 1.10 – 1.15
Die cutting of film labels more demanding, as they need an heavier pressure
Label + adhesive
Silicone coated liner

13. Applications needing a Supercalendered Base Paper
Label Dispensing
Target: automatically remove the label from the silicone coated liner and apply it to the product or container.
Requirements for the liner:
Resistance, tensile strength: it has to take most of the strain of the applicator procedure
The tension of the web changes continuously / stop & go process
A problem or a break bring the whole fitting and labelling to a stand still. Possible cause for breaks: silicone voids, impurities
Transparency: the labels are detected by a photocell that needs to read through the liner
photocell
labels
receptor
silicone coated liner

14. Applications needing a Supercalendered Base Paper
Double side adhesive tapes are used in domestic and industrial applications. They are winded over a double side silicone coated release liner, that prevents the tape from sticking to itself.
Requirements: high smoothness and surface treatment enabling silicone hold-out on both sides; high internal bond
Silca Industrial Supercalendered base papers treated for silicone coating on both sides.
·         62 – 130 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

15. Applications needing a Supercalendered Base Paper
Double side adhesive tapes
Tape coated with adhesive on both sides
Main Applications :
Packaging tapes
Medical tapes
Industrial tapes (double side adhesive, foam tapes, protection tapes)
Consumer double side adhesive tapes
Electronic tapes (semiconductors and carriers)
Liner coated with silicone on both sides

16. Applications needing a Supercalendered Base Paper
Double side adhesive tapes
Materials used as liners (Europe) :
Glassine (60%)
Clay Coated paper (20%)
PE Coated paper (7%)
Films (5%)
Others (6%)
Requirements for the liner :
Mechanical strength (converting)
Tear Resistance (converting)
No Static loading (converting / end use)
Silicone anchorage (end use)
Release stability (end use)
No dust (end use)
Silicones used (Europe) :
Solvent free (70%)
Emulsion (15%)
Solvent (15%)

17. Applications needing a Supercalendered Base Paper
PSA Insulation and Soundproofing materials are widely used in automotive and construction industry. The adhesive face of those materials is protected by a silicone coated release liner.
Requirements: high mechanical characteristics; high internal bond to stand the often very high tack of adhesives used.
Silca Industrial Supercalendered base papers for silicone coating, ideal for “heavy duty” industrial applications and for use as carriers and interleaves. ·         62 – 130 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

18. Applications needing a Supercalendered Base Paper
Insulating, soundproofing, interleaves
1 Side adhesive:
Main Applications :
Mastic & Foam for soundproofing and insulation
Bitumen for roof covering
Alluminium for thermal insulation
Fooring and carpets
Car emblems and components
Electronic interleaves (semiconductors and carriers)
2 Side adhesive:

19. Applications needing a Supercalendered Base Paper
Specialty Applications demand materials winded in very small reels that assure the needed length and a small diameter to fit into the devices they serve: retail portable pricing labellers, supermarket weights; corrective tapes etc.
Requirements: low weight and low thickness; high resistance and transparency
Silca Light Supercalendered base papers for silicone coating are high performance glassines with increased transparency and low thickness.
·  40 – 50 gsm
· Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

20. Applications needing a Supercalendered Base Paper
Primary Labels
Adhesive Tapes
Soundproof, Insulating, Interleaves
Specialty Applications
Silca Label
57 – 80 gsm
Silca Industrial
62 – 130 gsm
Silca Light
40 – 50 gsm

21. 1 Release Base Papers Making and Properties
Silco Clay coated base papers
Double coating: 1
Process Flexibility thanks to PM equipped with multiple coaters, one or more coating layers can be applied on the side to be siliconised, according to the requirements.
if needed, coating can be applied also to the back side
Coating + pre-coating:
Back side coating:

22. 2 Release Base Papers Making and Properties
Silco Clay coated base papers
Back side is designed according to the converting process (target = layflat):
no coating = easier remoisturing ;
coating = smaller sensitiveness to changes of humidity in the environment 2
Specific coating 100% designed for silicone application. All chemical used are tested and do not interfere with the silicone curing.
Silicone hold out is excellent because of double coating
Double coating:

23. Applications needing a Clay Coated Base Paper
Self Adhesive Office Products for desktop printers
PSA laminates in Large Sheets
Self adhesive envelopes
Sanitary Products baby diapers and sanitary napkins

24. Applications needing a Clay Coated Base Paper
Office Products such as self-adhesive labels in A4 sheets for desk-top printing are more and more popular. They rely on a release liner with specific features
Requirements: appropriate body for a perfectly flat sheet; back side allowing easy feeding of the sheet into the printer
Silco Office A range of clay-coated base papers for silicone coating assuring low silicone consumption, good body and perfect lay-flat. Adapted back side avoids misfeeding while enabling good printing (for brand or instructions)
·  50 – 70 gsm
· Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

25. Applications needing a Clay Coated Base Paper
Office Products
Lay Flat:
1) FLAT LAMINATE - BEFORE CURING
3) FLAT LAMINATE - AFTER CURING AND AFTER REMOISTURISING
FACE
MATERIAL
LINER
MOISTURE WAS GIVEN BACK
2) CURLED LAMINATE - AFTER CURING
4) CURLED LAMINATE - AFTER EXCESS REMOISTURISING
MOISTURE WAS LOST
TOO MUCH MOISTURE WAS GIVEN BACK

26. Applications needing a Clay Coated Base Paper
Office Products
COOLING CYLINDER
OVEN
STEAM BOX
Paper Temp: 120°C Moisture Content: 2-3%
Paper Temp: 40°C
Paper Temp: 40°C Moisture Content: 4-5%
Paper Temp: 100°C Moisture Content: 4-5%
Lay Flat control:
Remoisturing through a steambox
After silicone curing
After adhesive drying
(after lamination)

27. Applications needing a Clay Coated Base Paper
PSA laminates in Large Sheets suit a variety of uses, from screen printed promotional material to plotter cut vinyls for decorative and graphic applications. Top performance is expected from the liner to allow precise register in multi-step printing
Requirements: high dimensional stability; extremely high lay-flat, high smoothness of the silicone coated side
Silco Classic A range of clay-coated base papers for silicone coating featuring extremely smooth coated side for lowest silicone consumption, highest dimensional stability and lay-flat.
Silco Flat clay coated base papers feature an additional coating on the back side for an even improved lay-flat
·         75 – 180 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

28. Applications needing a Clay Coated Base Paper
Large sheets
Comparison between PE Coated liners and Clay Coated liners :
The main reason of using a PE Coated liner is the dimensional stability of this product.
The polycoating on the backside gives a very good dimensionnal stability
But back side treatment is now available also on Clay Coated liners
in addition to that, PE Coated liners also have several disadvantages:
Thermal sensitivity: limit in curing temperature
Silicone coverage not measurable: risk of uneven coating
Poor silicone anchorage
Low density: poor die-cutting, risk of delamination during label peeling
Static Loading

29. Applications needing a Clay Coated Base Paper
Self adhesive envelopes offer easy use and various features (re-seal, no steam sensitiveness …). The adhesive strip on the envelope flap is protected by a silicone coated release liner to be pealed before sealing.
Requirements: good lay-flat to avoid anti aesthetic wrinkles; printability of the back side for brand or instructions
Silco Light Light-weight pigmented release base papers for silicone coating, offering good siliconability, mechanical strength, back side printability.
·         35 – 45 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

30. Applications needing a Clay Coated Base Paper
Sanitary Products like disposable baby diapers and sanitary napkins rely on self adhesive sealing systems. A light-weight release liner to be peeled before use protects the adhesive strips.
Requirements: good mechanical properties; good lay-flat; printability of the back side for brand or instructions
Silco Light Light-weight pigmented release base papers for silicone coating, offering good siliconability, mechanical strength, back side printability.
·         35 – 45 gsm
·         Suitable for coating with all silicone systems (solvent, solvent-free, Emulsion, UV)

31. 1 Applications needing a Clay Coated Base Paper
Envelopes, Sanitary Products
How to obtain lay flat and mechanical strength in an extremely light weight paper.
reduce the amount of coating so to increase the amount of cellulose fibres without increasing the paper weight
fibres = strenght and lay flat 1
Std coating:
Same basis weight
Light coating (pigmentation):

32. 2 Applications needing a Clay Coated Base Paper
Envelopes, Sanitary Products
Avoid telescoping of very narrow reels:.
telescoping is caused by the excessive smoothness of the back side of the liner, that slips when winded against the silicone coated side
a slight back side roughness can avoid the issue
Narrow reels of
Silicone coated
liner: 2
Easy telescoping ...

33. Applications needing a Clay Coated Base Paper
Office Products
Large Sheets
Self adhesive envelopes
Sanitary Products
Silco Office
50 – 70 gsm
Silco Classic, Silco Flat
75 – 180 gsm
Silco Light
35 – 45 gsm