FI128490B

FI128490B - Vanerinen pakkausvyöte

Info

Publication number: FI128490B
Application number: FI20176041A
Authority: FI
Inventors: Teemu Aittamaa
Original assignee: Teemu Aittamaa
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2020-06-15
Also published as: US20190352067A1; EP3489004A1; FI20176041A1

Abstract

The present application provides a method for manufacturing a blank for forming a packaging plywood sleeve for wrapping a package, the method comprising providing a plywood sheet having a thickness in the range of 0.1–2.0 mm and comprising at least two plies, and cutting at least one fold line to the plywood sheet by cutting through less than all plies of the plywood sheet. The present application also provides a blank for forming a packaging plywood sleeve, a method for manufacturing a packaging plywood sleeve and a packaging plywood sleeve.

Description

Packaging plywood sleeve Technical field The present application relates to packaging plywood sleeves for wrapping package, and to methods for manufacturing the packaging plywood sleeves.

The present application also relates to blanks for forming a packaging plywood sleeve, and to methods for manufacturing the blanks.

Background Package sleeves, in general tubular package sleeves, may be used to wrap one or more packages.

Such package sleeves are usually formed from cardboard or plastic, which are relatively easy to process to obtain fold lines.

Cardboard can be creased to obtain one or more fold line, practically without damaging the structure of the cardboard.

However, the package sleeves obtained from cardboard and plastics are mass products with modest appearance.

For special products, such as gifts and expensive products, it would be desirable to use material having a special, even luxurious, appearance.

Summary It was found out that plywood having a smooth surface and wooden appearance can be formed into tubular package sleeves, which could be = used for packing products.

The problem with plywood is that it is very N challenging material to process and it may crack easily.

Forming fold lines by - creasing is not possible, at least if a finished appearance is desired.

During N 30 creasing the outermost ply remains continuous which does not result in z acceptable fold.

Specific thin plywood as starting material and specific ” processing techniques were needed to obtain a final product with high quality 3 and desired properties. ™~ The present application provides a method for manufacturing a blank for forming a packaging plywood sleeve for wrapping a package, the method comprising

-providing a plywood sheet having a thickness in the range of 0.1-2.0 mm and comprising at least two plies, -cutting at least one fold line to the plywood sheet by cutting through less than all plies of the plywood sheet.

The present application also provides a blank for forming a packaging plywood sleeve for wrapping a package, the blank comprising a plywood sheet, the ends of the plywood sheet being joinable together to provide a continuous plywood sleeve, wherein the plywood sheet has a thickness in the range of 0.1-2.0 mm and wherein the plywood sheet comprises at least one fold line obtained by cutting through an outermost ply of the plywood sheet. The present application also provides a packaging plywood sleeve for wrapping a package comprising a plywood sheet, the ends of the plywood sheet being joined together to provide a continuous plywood sleeve, obtained from the blank. The present application also provides a packaging plywood sleeve for wrapping a package comprising a plywood sheet, the ends of the sheets being joined together to provide a continuous plywood sleeve, wherein the plywood comprises at least one fold line obtained by cutting through the outermost ply of the plywood. When specific thin plywood having a low thickness was used, it was possible to obtain package sleeves which are applicable to most packages and have the desired properties. For example the package sleeves are foldable, = collapsible, flexible and have a perfect and finished appearance for gift and N luxury products, for example. Especially the fold line remains clear-cut when - thin plywood is used. The plywood as natural material is ideal for such N 30 products, as the natural wooden surface of the plywood is always unique in I every single sleeve. Wood as material provides a specific texture and feel ” when touched. Identical appearance, feel and visual effect is practically 3 impossible to obtain using synthetic materials. ™~ It was possible to form fold lines to the thin plywood by using the specific methods of the embodiments so that the plywood was foldable along the foldline, and the folding did not damage the appearance of the plywood. The edges of the fold line remained clean and no visible cracking occurred. It was also possible to obtain desired printing or imaging on the surface of the plywood sleeve for example by printing, embossing, debossing, pyrography and/or hot foiling the plywood sheet. Such imaging may be carried out for specific purposes, for example a logo or a company name may be provided on packaging sleeves for gift products. Further, it was also possible to dye the plywood so that the natural wood surface, such as the grains, are visible.

Brief description of the figures Figure 1 shows a schematic example of a blank for forming a packaging plywood sleeve for wrapping a package Figure 2 shows a schematic example of a packaging plywood sleeve for wrapping a package Figure 3 shows a photo of a fold made along the graining direction of the outmost ply Figure 4 shows a photo of a thin plywood cut with a knife at the outermost ply Figure 5 shows a photo of a fold made along the fold line of Figure 4 = Figure 6 shows a photo of a membrane formed by the adhesive between N the plies N 30 Figure / shows a photo of a fold line formed into 4-plied 0.9 mm plywood = ” Figure 8 shows a photo of examples of package sleeves with fold lines 3 made to the outermost ply of packaging sleeves perpendicular to the graining ~ (left) and along the graining (right) & 35 Figure 9 shows a photo of a package sleeve wrapped around a package

Detailed description The packaging sleeves described herein are formed from plywood sheets, which are cut to obtain fold lines and optionally a desired shape. These processed sheets may be called blanks, which may be then joined from their opposite ends and folded along the fold lines to form the package sleeve, which is practically tubular. The tubular package sleeve is usually adapted to fit a specific package, ie. to wrap the package tightly so that the sleeve remains wrapped on the package.

Plywood is an engineered wood product in a form of a sheet material manufactured from thin layers or plies of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. The plywood discussed herein contains at least two plies. However, in most cases a plywood contains at least three plies. In general plywood contains adhesive, which is often called as resin, and wood fibre sheets which may be called as veneers or plies, and it is present as composite material. The alternation of the grain in the plies is called cross- graining and has several benefits. It reduces the tendency of wood to split. It also reduces expansion and shrinkage, providing improved dimensional stability, and it makes the strength of the panel consistent across all directions. There is usually an odd number of plies, so that the sheet is balanced and warping is reduced. Because plywood is bonded with grains running against one another and with an odd number of composite parts, it is very hard to bend it perpendicular to the grain direction of the surface ply.

N N Plywood may be made of for example softwood, hardwood or tropical wood. - Softwood plywood is usually made either of cedar, Douglas fir or spruce, N 30 pine, and fir (collectively known as spruce-pine-fir or SPF) or redwood and it x is typically used for construction and industrial purposes. 3 Hardwood plywood may be made out of wood from angiosperm trees and = used for demanding end uses. Hardwood plywood is characterized by its excellent strength, stiffness and resistance to creep. It has a high planar shear strength and impact resistance, which make it especially suitable for heavy-duty floor and wall structures. Oriented plywood construction has ahigh wheel-carrying capacity.

Hardwood plywood has excellent surface hardness, and damage- and wear-resistance.

Tropical plywood may be made of mixed species of tropical wood, such as 5 originally from the Asian region, but also from African and South American countries.

Tropical plywood is superior to softwood plywood due to its density, strength, evenness of layers, and high guality.

It is usually sold at a premium in many markets if manufactured with high standards.

Examples of veneers or plies with a showy appearance, which may be used in the plywoods, include mahogany, cedar, such as aromatic cedar or Spanish cedar, cherry, chestnut, birch, such as natural birch or white birch, pine, poplar, red adler, oak, such as red oak or white oak, rosewood, teak, walnut, maple, wenge, yew, and zebrawood.

Plywood may contain one or more veneer(s) with a desired appearance, and it may further contain one or moe veneers of other wood.

For example the outermost veneer may be different than the other veneers.

One type of plywood is high-strength plywood, also known as aircraft plywood, which may be made from mahogany, spruce and/or birch using adhesives with an increased resistance to heat and humidity.

In general, aircraft plywood is available in thicknesses of 3 mm (3 ply construction) and upwards.

In some cases aircraft plywood uses veneers of 0.5 mm.

In the present embodiments so called thin plywood is used, which may have a thickness in the range of 0.1-2.0 mm, for example 0.4—1.0 mm.

It is thinner = than plywoods used for construction and even thinner than the aircraft N plywood.

The material can be bent to some extent, but folding the thin - plywood causes the material to crack.

Therefore it is challenging to form N 30 continuous angled shapes from thin plywood. = ” However in the present embodiments it was found out how to treat thin 3 plywood to obtain foldable structures, such as collapsibly foldable structures. = Such structures may be used for forming wraparound products, i.e. products that can be wrapped around a target or substrate, such as a package.

Such products may be called as plywood sleeves, such as packaging plywood sleeves.

The sleeves contain wall panels foldably connected to each other.

The sleeve comprises at least one continuous folding edge formed to the sleeve wall.

The packaging plywood sleeve for wrapping a package described herein is collapsibly foldable, preferably refoldable, i.e. it can be folded into a flat structure, which can save space and allows packing, storing and/or transporting a number of products in small space.

Similarly the formed blanks may be packed, stored and/or transported in small space in piles.

When a plurality of such products are piled and especially packed, they are safe from mechanical damage and can be handled safely.

The blank may be in a form of an elongated sheet, so that the ends of the elongated sheet are joinable or connectable to each other to form a continuous ring, band or sleeve.

The present application provides a method for manufacturing a blank for forming a packaging plywood sleeve for wrapping a package, the method comprising providing a plywood sheet, and cutting at least one fold line to the sheet.

The present application also provides a blank 10 for forming a packaging plywood sleeve for wrapping a package, which blank may be obtained with the methods described herein.

An example of such a blank is shown in Figure 1. The blank comprises a plywood sheet having a thickness in the range of 0.1-2.0 mm and comprising at least two plies, and comprising at least one fold line formed by a cut or a discontinuity line or plane through less than all plies of the plywood sheet. = The ends 14, 16 of the blank 10 may be joined together by using one or more N adhesive(s) 18. The ends are the opposite ends of an elongated blank, in - general the opposite ends in the direction of the longest dimension, i.e. the N 30 length, of the blank.

The length of the blank depends on the desired I dimensions of the packaging sleeve to be formed, or the dimensions of the ” package to be wrapped, and may be in for example the range of 20-200 cm, 3 such as 20-100 cm or 20-80 cm. ™~ The method for manufacturing a blank for forming a packaging plywood sleeve for wrapping a package comprises providing a plywood sheet having a thickness in the range of 0.1-2.0 mm and comprising at least two plies.

Theplywood may have a thickness in the range of 0.1-1.5 mm, such as in the range of 0.1—-1.0 mm, in the range of 0.3—-1.0 mm, in the range of 0.4-2.0 mm, in the range of 0.4-1.5 mm, or in the range of 0.4-1.0 mm. In one embodiment the plywood has a thickness in the range of 0.3-0.8 mm. In one embodiment the plywood has a thickness in the range of 0.4-0.7 mm. In one embodiment the plywood has a thickness in the range of 0.4-0.6 mm. These may be also the thicknesses of the walls of the final product. Examples of plywood thicknesses include 0.4 mm, 0.45 mm, 0.5 mm, 0.7 mm and 2.0 mm for 3-plied plywood, and 0.6 mm, 0.65 mm and 0.9 mm for 4-plied plywood.

In one embodiment the plywood comprises 2-5 plies. In another embodiment the plywood comprises at least three plies, such as 3-5 plies, 3—4 plies, or 4— 5 plies, or three plies, four plies or five plies. Plywood comprising at least three plies is structurally more stable, rigid and wear resistant than plywood comprising two plies. Such plywood can be more reliably formed into package sleeves and products with good quality and excellent appearance are formed. In one specific embodiment the plywood comprises three plies. In one specific embodiment the plywood comprises three plies and has a thickness in the range of 0.3-0.8 mm, such as 0.4-0.6 mm. Such thin plywood is flexible and it has a good appearance, but it is still durable and can be processed with the methods described herein. When the thickness is 0.8 mm or less, or 0.7 mm or less, or even 0.6 mm or less, the cut line remains clear- cut when the plywood is folded, as was demonstrated by the comparison tests. On the other hand, even with a plywood thickness of 0.9 mm or more = the thickness may cause problems. As can be seen from Figure 7, wherein a N 4-plied plywood having a thickness of 0.9 is cut though the uppermost ply, - the uncut plies are so thick together that they cause the formed fold to open N 30 is respect of the upper ply and the appearance of the fold may not be x acceptable for all purposes. 3 The method comprises cutting at least one fold line 12 to the sheet by cutting = through less than all plies of the plywood sheet. A discontinuity line or plane across one or more ply or plies is formed. This means that at least one ply is not cut, i.e. it is left unmodified or uncut. For example one, two, three or four plies, in general the outermost plies in the final product, are cut. It is alsopreferable that the adhesive between the cut and uncut plies is not cut, i.e.

the adhesive is left unmodified or uncut, and/or the adhesive is continuous.

In one embodiment the method comprises cutting at least one fold line to the sheet by cutting through only an outermost ply of the plywood sheet.

Therefore only one ply is cut, which provides in most cases the best result, in terms of appearance and mechanical properties of the formed fold. This is the case especially for three-plied plywood.

The number of the fold lines depends on the final use. For example for regular package boxes four fold lines 12 are required to obtain a tetragonal package sleeve having four sides or side wall panels 26, as shown in Figures 1 and 2. Other number of fold lines may be used for specific packages, for example two fold lines for sheets or envelope types of packages, wherein two side panels are formed.

The method may also include cutting a blank from the plywood sheet. A blank having a desired size, in general a length and a width, is obtained. Alternatively a pre-cut blank may be provided. The blank may have a width in the range of 3-30 cm, and/or a length in the range of 20-200 cm.

The cutting, both cutting the blanks and/or cutting the fold lines, may be carried out by using different methods, such as die-cutting, cutting with a blade, knife or the like, cutting with a CNC machine, cutting with a laser or a waterjet, or by sawing. Each cutting method provides a specific cutting line, and by examining the cutting line for example microscopically it is possible to = detect the manufacturing method.

N - In one embodiment the method comprises die-cutting the at least one fold N 30 line. Die-cutting refers to a method comprising using a die to shear the I plywood. Die cutting may be carried out on flatbed or rotary presses. Rotary ” die cutting may be done inline with printing. Rotary die cutting uses a 3 cylindrical die on a rotary press. A long sheet or web of material is fed = through the press into an area known as a "station" which holds a rotary tool that will cut out shapes and/or makes fold lines. Dinking uses special dies called dinking dies, or hollow cutters. The edges of the dies are usuallybeveled about 20* and sharpened. The die may be pressed into the material with a hammer or a mechanical press. It was found out that die-cutting resulted in best guality cut and high production rate could be obtained. With one die-cutting punch it is possible to form a plurality of blanks from a plywood sheet at once, for example a grid of 4 x 4 pieces, so a blank or a plurality of blanks having desired size and shape can be obtained. Any unevenness, such as undulant shapes in the plywood, does not have an effect to the process or to the result as the whole plywood sheet is pressed with the tool. Further, it is possible to cut the fold lines in the same process by die-cutting. In one embodiment the method comprises die- cutting the blank from the plywood sheet. In one embodiment the method comprises die-cutting the blank from the plywood sheet and the fold lines to the blank, for example at the same time or subseguently. This reguires a specific die, or the use of two or more dies, at least one for cutting the blanks and at least one for cutting the fold lines. Another option to cut the blanks and/or the fold lines is to use CNC machine. CNC refers to computer numerical control, which further refers to automation of machine tools by means of computers executing pre- programmed seguences of machine control commands. A CNC machine may be a cutter, such as a CNC router, which is a computer-controlled cutting machine. A CNC wood router is a CNC router tool that creates objects from wood. CNC stands for computer numerical control. The CNC works on the Cartesian coordinate system (X, Y, Z) for 3D motion control. Parts of a project can be designed in the computer with a CAD/CAM program, and then = cut automatically using a router or other cutters to produce a finished part.

N - Cutting by a CNC machine or by die-cutting yields a perfected cutting result N 30 with excellent appearance. However, the production speed with a CNC I machine is slower. Further, it may not be possible to fully control the depth = wise cutting of plywood having unevenness.

S ~ Cutting with a blade, knife or the like, preferably by slashing, may be carried out manually or the cutting may be automated. Such cutting may yield a good appearance, but the production speed is usually slow. Figure 4 shows aphoto of a thin plywood cut with a knife.

Figure 5 shows a fold made along the fold line cut by the knife.

In one embodiment of the method the at least one fold line is perpendicular to the grains, or more particularly to the direction of the grains, of the outermost ply.

In general this means that the grains of the outermost ply are substantially parallel to the lengthwise direction of an elongated blank.

If the outermost ply is cut along the graining direction of the outmost ply, the outermost ply may break when folded and the fold line is not acceptable, as can be seen in Figure 3. Figure 8 shows examples of fold lines made to the outermost ply perpendicular to the graining (left) and parallel to the graining (right). The difference in the formation of the package sleeve can be seen.

Also the dimensional stability is better when the fold line is perpendicular to the graining of the cut ply.

Further, it was noticed that when an inner uncut ply, for example the middle ply in a three-plied plywood, has graining direction parallel to the cut line in the outermost ply, the inner ply may support the folding and provide durability.

In one example a cross-banded thin plywood made from birch veneers throughout and faced with a joint-free birch veneer is used.

Such material provides a surface which is natural, light and smooth, and therefore desirable for use in package wrappings.

The birch thin plywood’s surface can be left in its natural state to show the appearance of the birch veneer or it can be waxed, painted, oiled or lacquered.

Also other plywood materials may be provided as joint-free, and they can be treated in similar way.

In one example the plywood, or at least the surface of the plywood, or the outermost ply, is = dyed, for example with black or other dark or coloured dye.

Dying may N highlight the grains and/or other surface details of the wood.

The dyed - plywood may be further decorated, for example by hot foiling.

N 30 I In one example the birch thin plywood is coated with other wood veneer such ” as mahogany, oak, ash or walnut, or other veneers discussed in previous. 3 Hot pressed coating such as painting films can also be applied to the surface. ~ The thin plywood may be manufactured using adhesive films to prevent the adhesive, such as glue, bleeding onto the surface.

In one embodiment the plywood contains fiber reinforced adhesive between the plies. Reinforced adhesive may enhance the durability of the fold line. A typical adhesive material for attaching the plies of plywood is a liguid, thermosetting adhesive material containing synthetic resin, such as urea resin, melamine resin or phenolic resin, DAP resin, unsaturated polyester resins, alkyd resins, epoxy resins or denaturalized, copolycondensed or mixed resin obtained by using the synthetic resin. Also other suitable adhesives or resins may be used.

In one example the thin plywood's veneers are glued with a special adhesive containing pulp and/or textile fibres. In one embodiment the adhesive between the plies contains pulp and textile fibers. Such reinforced adhesive produces a product which is both stable and flexible. Figure 6 shows how the adhesive between the plies forms a membrane which keeps the folded plywood together. The uppermost ply has been partly removed to reveal the adhesive membrane. The fiber may be any suitable fiber, such as textile fiber, natural, synthetic or semi-synthetic, woven or non-woven, for example one or more selected from polyester, nylon, rayon, polypropylene, aromatic polyamide, cotton and acetate, or glass woven fabric (including spunbond), or fiber glass or aromatic polyamide. Other fibers include natural fibers such as wood or vegetable fibers, such as pulp or paper, such as kraft paper, or other cellulosic fibers, which may or may not include lignin, or carbon fibers. In one example the pulp is wood pulp.

N N The thin plywood is suitable for printing or for forming images or figures with - another method. The blank may be provided as printed or otherwise N 30 illustrated or decorated containing one or more texts, images or figures I formed by printing or by another method, or it may be provided without such ” prints, texts, images or figures, for example as a printable blank, which 3 contains a printable surface. A printable surface is a surface of the plywood, = in general the surface which forms the outer surface of the package sleeve, which may receive printing, i.e. it does not contain such a coating or other ingredients which would prevent printing ink or the like attaching to thesurface. In the latter case the blank may be printed or imaged afterwards, for example at separate premises and/or by separate operator.

In one embodiment the method comprises printing, embossing, debossing, pyrography and/or hot foiling the plywood sheet, or the blank. Printing is a process for reproducing text and/or images using a master form or template.

The printing as used herein may include the traditional printing methods and also embossing, debossing, hot foiling or other suitable methods for forming the text and/or images onto the plywood or the blank. The printing may be for example screen printing or offset printing. One or more suitable printing inks can be used.

Embossing and debossing are processes of creating either raised or recessed relief images and designs in material, such as thin plywood. An embossed pattern is raised against the background, while a debossed pattern is sunken into the surface of the material. Embossing or debossing may be applied only to thin plywood. When the thickness of the plywood increases embossing or debossing is no longer possible.

Pyrography or pyrogravure is the art of decorating wood with burn marks resulting from the controlled application of a heated object such as a poker. It is also known as pokerwork or wood burning. Pyrography may be carried out by using solid-point burners, wire-nib burners, or laser cutters.

Hot foiling or hot foil stamping is a process of using heat and pressure to apply metallic foil or holograms to materials such as thin plywood. Hot foiling = may include simple flat foil stamping, deep embossing or embossing N combined with foil stamping, hologram and/or holographic foil application or - foil stamping combined with micro and/or structural embossing. Also N 30 combinations of printing, illustrating or decorating methods disclosed herein x may be used. 3 The present application provides a packaging plywood sleeve 20 for ~ wrapping a package comprising a plywood sheet, the ends of the plywood sheets being joined together to provide a continuous plywood sleeve or ring, wherein the plywood sheet comprises at least one fold line 22, obtained fromthe blank described herein. In the final product, especially when the product is wrapped on a package, the fold line 22 is afolded fold line. The plywood ring as used herein refers to a continuous structure, such as a sleeve, which may be called tubular, which however does not have to be completely round, especially when the plywood sleeve is folded at the fold lines. Figure 8 shows examples of such continuous plywood structures. The ends 14, 16 of the plywood sheet 10 may be joined together by using one or more adhesive(s) (18). In general the ends are the opposite ends of an elongated sheet, in general the opposite ends of the longest dimensions. The end are joined together by a connecting part 24 at one end 16 which overlaps with the other end 14, or the wall panel at the other end 14, as can be seen in Figure 2.

The adhesive may be applied to the blank 10, or be included in the blank. At the end of the blank there may be a connecting part 24 between one end of the blank 16 and the closest fold line 12, which contains the adhesive 18 and which is arranged to be joined to the opposite end 14 of the blank, as can be seen in Figure 1. This overlapping part 24 may contain the adhesive at the whole area or at a partial area. This part 24 is typically shorter than one full side or panel 26 of the final packaging sleeve 20. In the final continuous sleeve the connecting part 24 remains inside the sleeve. The adhesive may be present as one or more area(s), such as a strip or a band 18 having a width of 0.5-50 mm, at one or both ends of the blank. The = adhesive may be also applied to the blank when forming the final packaging N plywood sleeves. The adhesive may be applied as an adhesive tape, such as - two-sided self-adhesive tape, which may be covered by a removable release N 30 liner at one side. The adhesive may be applied as liquid or paste form, such I as glue, for example hot-melt adhesive, contact adhesive, pressure sensitive ” adhesive, reactive adhesive, heat-curable adhesive or multi-part adhesive. If x an adhesive is used which reguires action, such as activatable adhesive, to = provide adhesive effect, for example pressure sensitive adhesive, two-part adhesive, heat-curable adhesive, UV-curable adhesive, or adhesive covered by a release liner, it is possible to include the adhesive in the blanks and store the final blanks for example in piles without the separate blanksattaching to each other. Such blanks are in ready-to-use form and no further process steps except folding and joining the ends of the blanks, including activating the inactive adhesive, is reguired.

Figure 9 is a photo of a package sleeve wrapped around a cardboard package containing a jar of honey branded as “Korpikuusikon hunaja”. The brand mark containing text and an image is pyrographically burned onto one side of the plywood sleeve.

A method for manufacturing a packaging plywood sleeve for wrapping a package comprises -providing the blank 10 described herein, -folding at the at least one fold line 12, 22, and -joining the ends 14, 16 of the blank together to obtain the packaging plywood sleeve. A continuous plywood sleeve or ring is obtained, which may be folded and unfolded. Joining the end of the blank may include applying adhesive, or activating adhesive already present in the blank. Activating the adhesive may include applying pressure in case of pressure sensitive adhesive, removing a release liner, applying heat in case of heat-curable adhesive, applying UV light in the case of UV-curable adhesive, applying reactive agent, for example contacting two different adhesive components at opposite ends of the blank in case of two-part adhesive. The method for forming the packaging plywood sleeve may be combined with the method for manufacturing the blank, as described herein.

One embodiment provides a method for manufacturing a packaging plywood = sleeve for wrapping a package, the method comprising N -providing a plywood sheet having a thickness in the range of 0.1-2.0 mm - and comprising at least two plies, N 30 -cutting at least one fold line to the plywood sheet by cutting through less I than all plies of the plywood sheet to obtain a blank 10, ” -folding at the at least one fold line 12, 22, and 3 -joining the ends 14, 16 of the blank together to obtain the packaging = plywood sleeve. & 35 In one example a folded packaging plywood sleeve is obtained, such as a collapsible folded or foldable packaging plywood sleeve.

Examples Example 1.

I = - Different cutting methods die-cutting, CNC cutting and hand cutting by a knife S 20 were compared. The results are shown in Table 2.

N O N

Table 2. Comparison of different cutting methods Hn End Product Properties Production Fold line Time to produce 16 blank method Durability appearance Foldability units (minutes) Die-cutting ene [| 7 | 8 | 0 | 6 FF Hand cutting | 8 | 9 | 10 | s | Example 3.

Different plywoods having different thicknesses and numbers of plies were tested. The plywoods were cut by die-cutting. The results are shown in Table

3. Table 3. Comparison of different plywoods. Plywood thickness | Number Fold line (mm) of plies | Durability | appearance |Foldability Comments Nice and even fold Nice and even fold Nice and even fold Good fold - Bit too large by 4 visual evaluation Good fold - Bit too large by

0.65 4 7 visual evaluation Good fold - Bit too large by

0.7 3 7 visual evaluation os | 4 | 8 | 7 | 6 |Largeandunevenfold Remarkably large fold. N 2 3 5 4 3 looks partially broken S Folding impossible - fold N 4 3 breaks Ql

N

I a a 5 o ©

N O N

Claims

Patenttivaatimukset:

1. Menetelmä aihion valmistamiseksi pakkauksen käärimiseen tarkoitetun vanerisen pakkausvyötteen muodostamiseksi, jossa menetelmässä — järjestetään saataville vanerilevy, jonka paksuus on 0,1-2,0 mm, kuten 0,4— 1,0 mm, ja jossa on ainakin kaksi kerrosta, — leikataan vanerilevyyn ainakin yksi taitoslinja leikkaamalla vähempien kuin kaikkien vanerilevyn kerroksien läpi.

2. Patenttivaatimuksen 1 mukainen menetelmä, jossa leikataan levyyn ainakin yksi taitoslinja leikkaamalla vain vanerilevyn uloimman kerroksen läpi.

3. Patenttivaatimuksen 1 tai 2 mukainen menetelmä, jossa meistetään kyseinen ainakin yksi taitoslinja, edullisesti meistetään myös aihio vaneri- — levystä.

4. Jonkin edellisen patenttivaatimuksen mukainen menetelmä, jossa kyseinen ainakin yksi taitoslinja on kohtisuora uloimman kerroksen syiden suuntaan nähden.

5. Jonkin edellisen patenttivaatimuksen mukainen menetelmä, jossa vanerin kerroksien välissä on kuitulujitettua liimaa, kuten liimaa, joka sisältää sellua ja tekstiilikuituja.

6. Jonkin edellisen patenttivaatimuksen mukainen menetelmä, jossa = vanerilevy käsittää 2—5 kerrosta, kuten 3—5 kerrosta.

N 3 7. Jonkin edellisen patenttivaatimuksen mukainen menetelmä, jossa S vanerilevy painetaan, korkopuristetaan, debossing-puristetaan = ja/tai I 30 —kuumapainetaan. a 3 8. Aihio pakkauksen käärimiseen tarkoitetun vanerisen pakkausvyötteen

O ~ muodostamiseksi, joka aihio käsittää vanerilevyn, joka käsittää ainakin kaksi N kerrosta, jonka vanerilevyn päät ovat liitettävissä yhteen jatkuvan vanerisen — vyötteen aikaansaamiseksi, jossa vanerilevyn paksuus on 0,1-2,0 mm, kuten 0,4—1,0 mm, ja jossa vanerilevy käsittää ainakin yhden taitoslinjan, joka onsaatu leikkaamalla vanerilevyn uloimman kerroksen läpi mutta vähempien kuin kaikkien vanerilevyn kerroksien läpi, joka aihio on edullisesti saatu jonkin edellisen patenttivaatimuksen mukaisella menetelmällä.

9 Vanerinen — pakkausvyöte = pakkauksen — käärimiseen — käsittäen vanerilevyn, jossa vanerilevyjen päät on liitetty yhteen jatkuvan vanerisen vyöt- teen aikaansaamiseksi, jossa vanerilevy käsittää ainakin yhden taitoslinjan, ja joka on saatu patenttivaatimuksen 8 mukaisesta aihiosta.

10. Menetelmä — pakkauksen — käärimiseen = tarkoitetun — vanerisen pakkausvyötteen valmistamiseksi, jossa menetelmässä — järjestetään saataville patenttivaatimuksen 8 mukainen aihio (10), — taitetaan kyseinen ainakin yksi taitoslinja (12, 22), ja — liitetään aihion päät (14, 16) yhteen vanerisen pakkausvyötteen saamiseksi. oO

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