Synthetic & NCR Papers · The Complete Guide

Part 1 · Synthetic Papers

Synthetic paper is a category of materials that look and feel similar to paper but are manufactured from plastic polymers rather than cellulose fibres. The key properties that distinguish synthetic paper from conventional paper are straightforward:

• Completely waterproof, submerge it, run it under a tap, leave it in the rain. It does not swell, disintegrate, or lose structural integrity.
• Highly tear-resistant, requires significantly more force to tear than wood-pulp paper of equivalent weight. Not indestructible, but far more durable.
• Dimensionally stable, does not expand or contract with humidity changes. Conventional paper expands across the grain when humidity rises, causing registration problems in multi-colour printing. Synthetic paper does not.
• Smooth, consistent surface, the surface of BOPP synthetic paper (Yupo) is exceptionally smooth and consistent, enabling very fine halftone reproduction.
• Non-absorbent, ink does not soak in. It must adhere to the surface through adhesion chemistry rather than absorption.

The non-absorbency is both synthetic paper's greatest advantage and its greatest printing challenge. Standard water-based and oil-based inks do not adhere reliably to plastic surfaces without surface treatment. Getting ink to stay on synthetic paper requires either UV-curable inks (which polymerise on the surface), solvent-based inks, or surface treatment of the synthetic paper itself (most commercial synthetic papers come pre-treated with corona or flame treatment to increase surface energy and ink adhesion).

BOPP Synthetic Paper · Yupo and Equivalents

BOPP synthetic paper (Biaxially Oriented Polypropylene) is the dominant synthetic paper type in the commercial printing market. Yupo is the most widely known brand globally, a Japanese product manufactured by Yupo Corporation, a joint venture originally established by Mitsubishi Chemicals. In India, Yupo and its equivalents are imported by specialty substrate distributors.

What BOPP synthetic paper is

The manufacturing process stretches a polypropylene film simultaneously in two directions (biaxially), creating a material with uniform strength and stiffness in all directions. The surface is then treated (corona or flame treatment) to raise surface energy above 38 dynes/cm, enabling ink adhesion. The result is a white, opaque, smooth synthetic sheet that closely resembles coated paper in appearance and feel.

Technical specifications

Applications · when BOPP synthetic is the right choice

What BOPP synthetic paper looks like in use

A restaurant that is tired of replacing laminated paper menus every few months because guests spill drinks on them switches to Yupo. The menu is printed in full CMYK with UV inks, unlaminated, and can be wiped down with a damp cloth after every service. It looks identical to a premium laminated paper menu, costs more per unit initially, but significantly less over the menu's operating life.

A pharmaceutical company needs labels on bottles that will be stored in cold rooms with condensation. Conventional paper labels absorb moisture from the cold room environment, delaminate from the adhesive, and fall off. BOPP synthetic paper labels are unaffected by moisture and remain firmly adhered through the entire cold chain cycle.

Stone Paper · No Trees, No Water, No Pulp

Stone paper is a genuinely different material from both conventional paper and BOPP synthetic paper. Its base material is calcium carbonate (limestone), the same mineral found in chalk, combined with a small percentage (typically 10–20%) of high-density polyethylene (HDPE) as a binder. No wood. No water. No pulp. No bleaching chemicals.

How stone paper is made

Ground calcium carbonate is mixed with HDPE resin and processed into granules. These granules are then extruded and stretched into a thin sheet, the same basic extrusion process used for plastic bags, but with a predominantly mineral content. The resulting sheet is white (from the calcium carbonate), opaque, smooth, and has a distinctive slightly waxy feel that distinguishes it from both paper and standard BOPP synthetic paper.

Stone paper vs conventional paper vs BOPP · comparison

The UV degradation issue · important for India

Stone paper contains calcium carbonate, which makes it susceptible to UV-induced degradation, prolonged exposure to direct sunlight causes the material to become brittle and crack over time. This is a significant limitation in India's high-UV climate. Stone paper is not suitable for outdoor applications in India where direct sun exposure will occur. Its appropriate uses are indoor, premium stationery, eco-branded collateral, books, and interior signage. For outdoor applications in India's climate, BOPP synthetic paper is the correct specification.

Teslin & PET Synthetic Papers

Teslin · for ID documents and high-security applications

Teslin is a patented synthetic paper manufactured by PPG Industries (USA). It is made from a microporous polyethylene matrix, a single-layer material with millions of tiny interconnected pores throughout its structure. These pores give Teslin a unique property: it accepts both conventional and UV inks well despite being synthetic, because the porous structure provides some ink absorption, while the polyethylene base provides waterproofing and dimensional stability.

Teslin's primary application is identity documents and security printing. It is used in:

• National ID cards and passports (the Teslin substrate survives lamination under heat and pressure, and the polyethylene matrix accepts laser engraving for personalisation)
• Driver's licences
• Student ID cards
• Loyalty and membership cards (thinner grades)
• Tags and labels requiring archival durability

Teslin is not generally available as a commercial printing substrate in India. Its primary users are government document printers and specialist card manufacturers. It is mentioned here for completeness and for buyers in the security printing or identification document space.

PET synthetic paper · Synaps, Polyart

PET (polyethylene terephthalate) synthetic papers, including Synaps (manufactured by Agfa) and Polyart, offer higher temperature resistance and dimensional stability than BOPP. PET remains stable up to approximately 150°C, making it suitable for applications involving heat that would deform BOPP (certain thermal processes, some hot lamination conditions).

Printing on Synthetic Papers · The Complete Rules

Synthetic papers require specific printing protocols. The non-absorbent surface means that standard offset and inkjet approaches that work on paper do not transfer directly to synthetic substrates. Following these rules prevents the two most common failures: poor ink adhesion (ink rubs off) and slow drying (ink transfers to anything that touches the printed surface).

Ink selection · the single most important decision

Surface energy · the invisible variable

All synthetic papers require a minimum surface energy of 38 dynes/cm for reliable ink adhesion. Most commercial synthetic papers come pre-treated to achieve this. However, surface energy decays over time, a roll of synthetic paper that was treated six months ago may have dropped below the threshold. Always test adhesion before a production run. Use dyne test pens (available from 30 to 56 dynes/cm in 2-dyne increments) to verify surface energy before printing.

The pre-print checklist for synthetic papers

• Verify surface energy with dyne test pens, minimum 38 dynes/cm. If below threshold, corona treatment must be applied before printing.
• Confirm ink system compatibility with the synthetic paper type, UV inks for BOPP, solvent or UV for PET/Synaps.
• Run adhesion test: print a test sheet, allow to cure fully, then apply Scotch tape and peel at 90°. Zero ink transfer = acceptable adhesion. Any ink transfer = reformulate or retreat.
• Check static build-up, synthetic papers accumulate electrostatic charge during printing. Use ioniser bars or earthed press components to dissipate static before it causes feeding and stacking problems.
• Set ink density targets 10–15% lower than coated paper targets, the non-absorbent surface gives higher apparent density at equivalent ink film weight.
• Drying / curing: UV inks cure instantly under the UV lamp. Allow no stacking or finishing until curing is confirmed. Conventional inks, do not use, they will not dry.
• Cutting: synthetic papers dull cutting blades faster than conventional paper. Change blades more frequently and ensure guillotine pressure is correct, synthetic papers require clean, sharp blade contact without compression.

Synthetic Papers in India · Market Reality

India's synthetic paper market is predominantly driven by the label printing industry rather than the commercial printing industry. The breakdown of synthetic paper usage in India by application:

Part 2 · Carbonless NCR Paper

NCR paper, No Carbon Required, is so embedded in the daily operations of Indian business that it has become invisible. The invoice book at the neighbourhood grocer. The challan at the transport company. The receipt book at the hospital outpatient registration. The job card at the motor workshop. The KOT (Kitchen Order Ticket) at the restaurant. All of these are printed on NCR paper.

Most people who use NCR paper every day have never heard the term. They call it "duplicate paper," "triplicate paper," or simply "the invoice book paper." The generic technical name, carbonless paper or NCR paper, is known primarily to press rooms, paper merchants, and stationery printers.

India's consumption of NCR paper is enormous. With 63 million+ small businesses, a cash-dominated economy, and regulatory requirements for paper-based invoicing in many sectors, NCR paper consumption has remained high even as digital billing has grown in urban organised retail. In the vast unorganised sector, which constitutes the majority of Indian commerce by number of transactions, NCR paper invoice books remain the standard operating record.

How Carbonless NCR Paper Works

Carbonless paper was invented by NCR Corporation (National Cash Register Company) in 1953 as a replacement for messy carbon paper. The original patent name, "No Carbon Required", became the generic descriptor for the entire category. The technology uses a chemical reaction between two coatings on adjacent paper surfaces to produce a copy impression wherever pressure is applied.

The chemistry

Two coatings are involved:

CB coating (Coated Back): Applied to the back surface of the top sheet. Contains microcapsules, microscopic bubbles filled with a colourless dye dissolved in oil. The capsules are designed to rupture under the pressure of writing, typing, or impact printing. When ruptured, the dye solution is released.

CF coating (Coated Front): Applied to the front surface of the receiving sheet. Contains a reactive clay, typically a phenolic resin or attapulgite clay, that chemically reacts with the dye released from the ruptured capsules. The reaction produces a coloured mark (typically dark blue or black) wherever the dye contacts the CF coating. The mark is permanent.

CFB coating (Coated Front and Back): Middle sheets in multi-part sets carry both CF (on the front, to receive the impression from the sheet above) and CB (on the back, to pass the impression to the sheet below). This allows the impression to travel through any number of intermediate copies.

Why the capsules rupture only where pressure is applied

The microcapsules in the CB coating are designed with a specific rupture threshold. Normal handling, picking up the paper, folding it, stacking it, does not rupture the capsules. Only focused pressure from a pen tip, typewriter key, or impact printer head exceeds the threshold and ruptures the capsules directly beneath the point of pressure. This is why a full NCR set shows only the writing, not a general stain.

NCR Sets · Standard Configurations

The standard colour sequence in India

The colour sequence for NCR sets is not a legal requirement in India, it is an industry convention that has become so standardised that buyers expect it. Deviating from the standard colour sequence will confuse recipients and create operational problems. Always follow the standard unless there is a compelling specific reason to deviate.

Pre-printed NCR sets vs plain NCR sets

Pre-printed NCR sets are the most common commercial NCR product in India. The form layout, column headings, business name, address, and GSTIN are all pre-printed on the NCR paper before it is padded (assembled into sets with a chipboard back and perforation). Pre-printing is done using conventional offset printing on the individual sheets before they are assembled into sets.

Plain NCR sets are unprinted, just the base paper with the carbonless coating. These are printed during the job (on an impact printer, typewriter, or dot matrix printer) without any pre-printed background.

Padding and binding NCR sets

NCR sets are assembled in a specific sequence and held together by padding compound, a flexible adhesive applied to the top edge of the assembled set. The padding allows individual sets to be torn off cleanly while keeping the pad intact. After padding, a chipboard backing is applied for rigidity in writing. Common configurations:

• NCR pads, multiple sets bound together in a pad. Typically 50 or 100 sets per pad.
• NCR books, sets bound as a book (stapled or stitched spine) rather than a pad. Harder to tear off but neater for formal invoicing.
• Continuous NCR stationery, pin-feed paper in continuous roll for dot matrix printers. Used in bulk billing applications (utility bills, bank statements before digital, logistics).
• NCR roll, used in point-of-sale and receipt printing applications.

Printing on NCR Paper · Rules for Press Rooms

NCR paper is printed before padding, individual sheets are printed in the same way as standard paper, then assembled into sets after printing. The printing process itself is not fundamentally different from printing on uncoated paper, but there are specific rules that must be followed to avoid activating the coating prematurely or damaging the chemistry.

What can be printed on NCR paper

Offset printing on NCR paper · rules

• Fountain solution pH: must be maintained at 5.2–6.0. Highly acidic fountain solution (below pH 4.5) degrades the CF coating chemistry and reduces copy quality. Check pH before starting an NCR job and monitor throughout the run.
• Ink choice: standard lithographic inks are compatible with NCR paper. Avoid inks with high aromatic solvent content, some aromatic solvents react with the microcapsule chemistry.
• Impression pressure: use the minimum impression pressure necessary for good ink transfer. Excessive impression pressure on the back of the sheet (against the chipboard backer or adjacent sheets) can rupture capsules and produce ghost marks on copies.
• Anti-setoff powder: use sparingly. Excess powder can interfere with the CF coating surface and reduce copy quality.
• Ink drying: allow full drying before the sheets are assembled into sets. Wet ink trapped between assembled sheets can migrate to the CF coating of adjacent copies and cause contamination.
• Sheet order: when printing multiple-part sets, print CB sheets (top copies) and CFB/CF sheets (copies) separately. Do not mix during printing, the different coatings behave slightly differently under impression.
• UV inks: some UV inks are incompatible with NCR coatings. Test compatibility before committing to UV offset for NCR work, the UV photoinitiators can react with the capsule chemistry in some formulations.

Digital printing on NCR paper

Pre-coated NCR paper can be run through laser printers and digital offset presses (e.g. Konica Minolta, Ricoh). Several suppliers offer NCR paper in standard cut sizes (A4, A3) specifically for digital printing workflows where small quantities of custom NCR forms are required. The heat from laser fusing does not typically damage the NCR coating, but test first, some NCR grades specify maximum fusing temperature.

NCR Paper in India · The Market Reality

India is one of the world's largest consumers of NCR paper by volume. Several factors sustain this demand despite the growth of digital invoicing:

Why NCR consumption remains high in India

GST and e-invoicing: The GST regime has actually increased formal paper invoicing in many segments by bringing previously informal transactions into a documented paper trail. Even as GST e-invoicing mandates grow, the physical invoice copy handed to the customer remains an NCR-printed document in millions of transactions daily.

The unorganised sector: India's vast unorganised sector, estimated at 45–50% of GDP, operates on paper-based record keeping. Kiranas, auto workshops, small manufacturers, contractors, transport operators, all use NCR invoice books as their primary transaction record. Digital billing adoption in this segment will take decades.

Regulatory requirements: Many regulated sectors, pharmaceuticals, food distribution, logistics, require paper-based documentation with signatures for compliance purposes. A digital record does not always satisfy the physical sign-off requirement.

The GST impact on NCR format

GST implementation changed the required content of tax invoices in India significantly. All pre-printed NCR invoice books must now include the supplier's GSTIN, the HSN/SAC code for goods/services, the tax rate and amount broken out separately (CGST, SGST or IGST), and the place of supply. Press rooms printing NCR invoice books must ensure their standard templates are GST-compliant. Non-compliant invoice books expose buyers to GST audit risk.

NCR paper sourcing in India

NCR paper is produced domestically in India by several mills, primarily using imported CB and CF coating chemistry. The paper base is Indian-produced; the specialty coatings are applied at the mill using chemicals sourced internationally. ITC PSPD produces NCR specialty papers as part of its specialty papers division. Several smaller converters produce NCR paper by purchasing base paper and applying coatings in a separate converting process. NCR paper is widely available through stationery paper merchants in all major Indian cities and is not a specialty import product, it is a standard commodity in the Indian printing paper market.