Fourdrinier Kraft Liner - "Fourdrinier" is the name of the man who invented the machine on which the liner is made. Hopefully this guide has provided answers to any questions you may have had regarding corrugated board grades. 6.4.1 Flutes—The number of ﬂutes per unit length of ﬁberboard shall be as follows or as speciﬁed: Flutes/ft Flutes/m Flute Height (in.) Tri wall – is triple fluted corrugated board which is used for its strength, flexibility and eco-friendliness. They are actually still playing on a full-size flute as far as fingers go. The selection of flute size is determined by the basis weight of Flute Facts . Being 3mm in thickness, it is exceptionally versatile and can be used in both die cutting and regular case-making processes. Postal & Fulfilment, Waterproof Cases Linerboard can be of several types. For double-wall and triple-wall board, the What is it manufactured from? Duplex – a type of paperboard made up of two layers, the exterior is often coated which makes it more water-resistant, often used for paper cups and plates and in the pharmaceutical industry, Edge crush test – A corrugated board strength test of vertical crush resistance, Enhanced Fluting – A substitute to standard fluting that adds strength and performance to the material. Each liner type is actually comprised of two distinct layers. Complete the form below to get a reply to any question from a member of the GWP team. of the corrugating material and the high speeds of the machines causes wear. This compressible material (usually pulp or news board) is usually adhered to the liner and provides a better finish (appearance), water resistance and extra strength. Flute – Paper that provides the central layer in corrugated board (cardboard). This terminology would be easily understood by virtually any packaging manufacturer (or at least should be), and also allows you to fully understand the type of material your cartons are manufactured from. Weight – refers to the density of a material, see GSM for further information. Until these kids grow enough this type of flute offers the best of both worlds. desired in the finished container. This can offer a rigid structure perfect for heavier items, whilst also allowing an improved aesthetic outer appearance and printing surface. Luxury / Retail / Gift-Box, Totes & Containers (Returnable) However, it can, if used in the wrong application, be prone to crushing. B-Flute, the second flute size adopted by the corrugated industry, has lower arch heights than A and more flutes per foot (50). The Mullen Burst Test is geared towards measuring the forces a carton may be subjected to during rough handling as well as the amount of weight the box can hold. It is, however, less costly than Kraft paper. The final aspect of the corrugated board that can affect its performance (and weight and cost), is the flute type. B, which is smaller was the next size The glue fixes the flutes in position and adds rigidity and stability to the papers. recent and the smallest. Fluting profile – The shape of the corrugations within the corrugated material, Grammage – Also referred to as GSM, the weight of paper specified as g/m2 (grams per square metre). Corrugated board can be created with several different flute profiles. If you are using high volumes of packaging, chances are you will be familiar with corrugated cardboard. For example, if your material grade was using a 125gsm Kraft outer liner, a 125gsm Test inner lining, and a B fluting, this would be written as…, Similarly, a 150 Test outer lining, plus a 150 Test inner lining, with an E flute, would be described as…. A is the largest. Despite cardboards’ widespread use, there are 2 main types of paper that are generally used for the liners. FEFCO case codes – A set of standard design patterns used within the corrugated industry. The available paper grades for outer and inner liners when manufacturing cardboard are as follows: The final 2 paper types listed here are those most commonly used for flutes, and less often used for liners. Original corrugated flute design. Around 4mm to 4.5mm thick, EB flute (as the name suggests) combines E and B flutes into a double walled material. However, should you have any other queries, or would like to see if your packaging is being manufactured from the most cost-effective material, then please do not hesitate to contact a design engineer at GWP. Simply knowing how a corrugated board grade is manufactured, and its’ component parts, doesn’t necessarily allow you to make an informed choice on the type of material you should be using for your packaging. To find out more, please read our, full overview of how cardboard is made, please click here, gsm is an abbreviation of Grams per Square Meter, packaging is being manufactured from the most cost-effective material, Corrugated board grades (cardboard) explained, Packaging Terminology: A glossary of terms, FULLY BLEACHED WHITE (BW): Fully bleached Kraft liner, WHITE TOP (WT): White coated recycled liner, SEMI CHEM (SC): Virgin fibres using neutral sulphite semi-chemical process, BC FLUTE: Double Wall – 6mm -Combination of B + C flutes, EB FLUTE: Double Wall – 4.5mm -Combination of E + B flutes. As it is possible to vary a number of parameters when specifying the board type for packaging – such as paper weights, flute types and number of walls, it is actually possible to achieve similar performance with differing board grades. GSM – an acronym for the measurement of grams per square meter. h�b```a``ve`e`�\� �� @V �h``�``X)T*�-%. This is in fact measured in the same way for all papers, meaning you may have seen “80 gsm” on the copier paper you use in your office or home printer. Deckle – The width of the board being run on a corrugator. Please note however this list is not exhaustive, and there are a number of other specialist papers available. Your Email (required) Printed, Retail & POS At a basic level, a corrugated board is made up of the two liners, plus the single fluting. Test paper is actually a double layered (or duplex) paper. Although the meshed steel rollers that form them are hard, the abrasive nature This means that the medium contacts and supports the liners at a greater number of points, providing a stiff, flat surface for high quality printing and die cutting and with excellent crush resistant properties. Once you understand the types of paper available and commonly used, it is also important to consider the weights of paper. Being 6mm to 7mm in thickness, this double wall material combines both B and C flutes together. E flute is approximately 1mm to 1.5mm in thickness, providing a very fine flute. Before going into the more technical details, it is useful to highlight the way in which corrugated board is formed (if you would like a full overview of how cardboard is made, please click here). Crush – An edge crush test measure the cross direction crushing of corrugated board. From flutes to gsm, liners to the number of walls, everything is explained. The final aspect of the corrugated board that can affect its performance (and weight and cost), is the flute type. Generally, larger flute profiles deliver greater vertical compression strength and cushioning. This means your custom corrugated boxes are 100% made by Welch Packaging! Packaging Terminology: A glossary of terms and definitions, Packaging material costs – 5 ways the wrong board grade affects prices, Jay initially joined GWP Packaging in mid-2008 before becoming Sales Manager in 2011, meaning he has worked for GWP for over 10 years. Blank – A flat piece of corrugated board that has been cut and scored ready to make a box. The flutes in the corrugated boards are provided to provide better strength to the corrugated boxes. Flight Cases / Custom Built Chop edge (or just chops) – the length of the board / sheet.
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