Kraft paper and packaging
Kraft paper and packaging,specified to the gram.
Sack kraft, kraft liner, sulfite and greaseproof papers, paperboard and finished multiwall sacks. We connect pulp and paper mills and converters with packaging makers and industrial buyers, on written terms.
Free to ask · Confidential · Everything in writing
What we source
Four product groups.
- Sack kraft paper. Extensible, semi-extensible and standard kraft from virgin softwood pulp, unbleached or bleached, including high porosity grades, 50 to 120 g/m².
- Kraft liner and paperboard. Virgin fibre kraft liner for corrugated board, plus testliner, fluting and folding boxboard.
- Specialty papers. Sulfite sack paper, virgin or with recycled content, and greaseproof paper, natural or coloured.
- Kraft packaging. Multiwall paper sacks, valve or open mouth, and kraft paper bags, made to your size and print.
Sack kraft paper
The right grade for every filling line.
Typical ranges from virgin long fibre softwood kraft pulp, unbleached or bleached. TEA index is the key strength value for sacks.
| Code | Grade | Weight | TEA index | Strength | Plies | Typical uses |
|---|---|---|---|---|---|---|
| SKE HP | Extensible, high porosity (unbleached) | 70 to 110 g/m² | 3.1 to 3.3 J/g | ●●●○ | 2 to 3 | Cement and dry mixes in valve sacks on high speed lines, low dust |
| SKE | Extensible (unbleached) | 60 to 100 g/m² | 3.3 to 3.4 J/g | ●●●○ | 2 to 3 | Cement and dry mixes; extra perforation possible |
| SKS HP | Semi-extensible, high porosity (unbleached) | 60 to 110 g/m² | 2.8 to 3.0 J/g | ●●○○ | 3 to 4 | Cement and dry mixes in valve sacks, no perforation needed |
| SKS | Semi-extensible (unbleached) | 60 to 100 g/m² | 2.7 to 3.2 J/g | ●●○○ | 3 to 4 | Dry mixes, cement, retail, e-commerce, animal products, charcoal |
| SKI | Standard improved (unbleached) | 60 to 120 g/m² | 2.9 to 3.2 J/g | ●○○○ | 1 to 4 | E-commerce, retail, delivery, animal products, charcoal, seeds |
| WSKS | Bleached semi-extensible | 60 to 100 g/m² | 2.7 to 3.2 J/g | ●●○○ | 3 to 4 | Dry mixes, cement, agriculture, food products |
| WSKS HP | Bleached semi-extensible, high porosity | 60 to 100 g/m² | 2.8 to 3.0 J/g | ●●○○ | 3 to 4 | Dry mixes, cement, agriculture, food products |
| WSKI | Bleached standard improved | 60 to 100 g/m² | 2.9 to 3.2 J/g | ●●○○ | 1 to 4 | E-commerce, retail, delivery, animal products, charcoal, seeds |
| KS | Kraft liner board for flat layers | On request | Not applicable | ●●●● | Single board | Corrugated board production and as a packaging material |
Typical properties
SKE HP extensible high porosity kraft, by weight.
Typical values at 23 °C and 50% RH. Tested to ISO 536, ISO 1924-3, ISO 1974, ISO 535, ISO 5636-5 and ISO 287.
| Property | 70 g/m² | 80 g/m² | 90 g/m² | 110 g/m² |
|---|---|---|---|---|
| Tensile strength MD / CD (kN/m) | 5.3 / 4.5 | 6.0 / 5.1 | 6.8 / 5.8 | 8.2 / 7.0 |
| Stretch at break MD / CD (%) | 7.0 / 7.5 | 7.0 / 7.5 | 7.0 / 7.4 | 7.0 / 7.2 |
| TEA MD (J/m²) | 230 | 260 | 300 | 340 |
| Tear index MD / CD (mNm²/g) | 13 / 14 | 14 / 15 | 14 / 15 | 15 / 15 |
| Cobb 60, wire side (g/m²) | 32 | 32 | 32 | 32 |
| Air resistance, Gurley (s) | 6 | 6 | 6 | 6 |
| Moisture (%) | 7.5 | 7.5 | 7.5 | 7.5 |
Reels
Delivered ready for your converter.
| Parameter | Typical range |
|---|---|
| Weight range | 50 to 120 g/m² |
| Standard reel widths | 92 cm and 102 cm; other widths on request |
| Reel diameter | 100 to 120 cm |
| Core | 76 mm (3 inch) |
| Packaging | Neutral packaging available |
| Shipment | Container, bulk vessel, rail, truck or multimodal |
Liner and board
For corrugated and folding cartons.
Typical parameters used in the trade, agreed for each order.
| Product | Specified by | Typical uses |
|---|---|---|
| Kraft liner, virgin fibre (brown or white top) | GSM, burst, ring crush (RCT), Cobb, moisture, reel size | Outer and inner layers of corrugated board, food and industrial boxes |
| Testliner | GSM, burst, RCT, Cobb, reel size | Corrugated boxes |
| Fluting (semi-chemical or recycled) | GSM, CMT, RCT, moisture, reel size | Corrugated board |
| MG kraft (machine glazed) | GSM, brightness, smoothness, bleached or unbleached | Bags, wrapping, food packaging |
| Folding boxboard and coated duplex | GSM, caliper, brightness, coating | Cartons, sheets or reels |
| Solid bleached board (SBS) | GSM, caliper, brightness, food contact approval | Premium and food cartons |
Sulfite sack paper
Virgin or with recycled content.
Sack paper from unbleached sulfite pulp. Typical values.
| Property | Virgin (100% sulfite pulp) | Recycled content (50 to 95% sulfite pulp, rest recovered fibre) |
|---|---|---|
| Weight | 70 to 110 g/m² | 45 to 110 g/m² |
| Breaking load, CD | 3.0 to 4.0 kN/m | 2.6 to 4.3 kN/m |
| Elongation, CD | 2.7 to 3.7% | 3.0 to 3.8% |
| Tear resistance, MD | 45 to 65 N/m | 30 to 80 N/m |
| Cobb 60 | Max 40 g/m² | Max 40 g/m² |
| Moisture | 6 to 11% | 6 to 11% |
Greaseproof paper
For food that should not leak through.
Thin, strong paper from slow beaten cellulose, with high grease resistance. Natural, or coloured in magenta, green, brown and yellow. Used for baking, confectionery, cake cases, fast food, and printed napkins and placemats.
| Property | 40 g/m² | 45 g/m² | 52 g/m² |
|---|---|---|---|
| Burst strength, min (kPa) | 240 | 250 | 260 |
| Grease resistance (KIT value) | 6 to 8 | 6 to 8 | 6 to 8 |
| Grease penetration, max (mg) | 30 | 28 | 25 |
| Folding endurance, min | 180 | 180 | 180 |
| Brightness, min | 70% | 70% | 70% |
| Moisture | 7 ± 1% | 7 ± 1% | 7 ± 1% |
Kraft packaging
Made to your specification.
Finished packaging is produced to the buyer's size, construction and print.
| Product | Specified by | Typical uses |
|---|---|---|
| Multiwall paper sacks, valve | Size, 2 to 4 plies, paper grade and weight, valve type, liner, print | Cement, dry mixes, chemicals, minerals |
| Multiwall paper sacks, open mouth | Size, plies, paper grade, bottom type, liner, print | Flour, sugar, animal feed, seeds, charcoal |
| Kraft paper bags | Size, GSM, handle type, print | Retail, e-commerce, food service |
For a precise answer
What to includein your request.
The more precise the request, the faster the right match.
- 01Product and grade
- 02GSM and key strength values (TEA, porosity, burst, RCT or Cobb)
- 03Reel width, diameter and core, or sack size and construction
- 04Quantity, and whether it is a single order or regular supply
- 05Destination port or delivery point, and preferred Incoterm
- 06Payment preference
How we work
Three steps.You stay in control.
- Tell us the grade and the specificationGSM, strength values, quantity and destination. Free, confidential, no obligation.
- We find and screen the other sideMills, converters and buyers are checked against international sanctions lists before any introduction, under an NDA.
- You agree terms in writingPrice, payment, inspection and delivery are signed between buyer and supplier. We coordinate to delivery.
Questions
Common questionsabout kraft paper.
What specification do I need to send for sack kraft paper?
The type (natural or white, standard, semi-extensible or extensible, high porosity or not), the grammage, and the key strength values: TEA, tensile strength and stretch, air permeance and Cobb. Add the reel width, diameter and core, the end use and filling method, the quantity and the destination; see how to specify sack kraft paper.
What is the difference between extensible and semi-extensible sack kraft?
Extensible sack kraft stretches more before it breaks, so it has a higher TEA and absorbs drops better, often with fewer plies. In the grades we work with, extensible SKE has a typical TEA index of 3.3 to 3.4 J/g in 2 to 3 plies, against 2.7 to 3.2 J/g in 3 to 4 plies for semi-extensible SKS.
What grammage and reel sizes does sack kraft come in?
The sack kraft grades we work with typically range from 50 to 120 g/m². Standard reel widths are 92 cm and 102 cm (other widths on request), with a reel diameter of 100 to 120 cm and a 76 mm (3 inch) core.
Can you source finished multiwall paper sacks?
Yes, made to the buyer's specification. Valve and open mouth multiwall sacks are produced to your size, 2 to 4 plies, paper grade and weight, valve type, liner and print, as are kraft paper bags for retail, e-commerce and food service.
What does the KIT value mean for greaseproof paper?
The KIT value measures grease resistance: the higher the number, the better the paper resists grease. The greaseproof grades we work with have a typical KIT value of 6 to 8 at 40, 45 and 52 g/m².
Guides
Before you senda specification.
- 01
How to specify sack kraft paper
How to specify sack kraft paper for multiwall sacks: grammage, tensile strength, TEA, stretch, porosity and Cobb, explained with a checklist.
- 02
Kraft liner vs testliner vs fluting
Kraft liner, testliner and fluting compared: virgin vs recycled fibre, grammage, burst, RCT, SCT, ECT and Cobb tests, and where sack kraft fits in.
Get started
What do you supplyor need?
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