DE102008027357A1 - Package i.e. book cover, has carrier layer made of paper, board or cardboard, and wedge-shaped material recess provided in carrier layer and expanded in direction of reference bend line, where recess exhibits wedge angle equal to bend angle - Google Patents

Abstract

The package has a carrier layer (1) made of paper, board or cardboard and coated on a side with a decorative layer (2) made of UV-material, and a reference bend line partially separating the carrier layer. The reference bend line is divided into package areas bordered by the reference bend line. The package areas enclose a bend angle with each other in a bend condition. A wedge-shaped material recess is provided in the carrier layer and expanded in a direction of the reference bend line. The material recess exhibits a wedge angle (alpha) equal to the bend angle. An independent claim is also included for a method for manufacturing of a package.

Description

The The invention relates to a package consisting of a carrier layer made of paper, cardboard or cardboard, one-sided with a decorative layer is coated and has a predetermined bending line and a method for producing such a packaging. Coating should be in the sense of the invention also include printing.

In the DE OS 37 42 917 For example, a method is described in which a laser beam is moved across the surface of a sheet material along an intended creasing edge. Advantageously, the laser beam can be guided in several closely adjacent lines over the region of the folded edge. The sheet-like material should be plastic, a printed data carrier made of paper or a paper-like material that is laminated on at least one side with a plastic layer.

The changes caused by the short-term influence of the laser beam in the plastic explains the applicant of the DE OS 37 42 917 as follows.

Next the breaking of the polymeric molecular structure of the plastic changes The orientation of the molecules and there is a material removal by evaporation and drainage of the material from the Laser beam swept area after its edges out instead. The resulting weakening of the plastic cross section in the area of the intended folded edge is further reinforced, that in the plastic in the area swept by the laser beam Store gas bubbles.

The method described here does not succeed if one in a package of coated paper, cardboard or cardboard want to introduce a predetermined bending line, wherein the coating not be affected and long-term stable also over a variety of buckling should remain undamaged.

such Packaging is used in particular as product packaging, which not only serve as transport packaging, but in particular Packaging in which the end customer transfers the product stored its life.

Such Packaging often becomes multiple over its lifetime opened and closed, being in the open and / or closed state adjacent to a predetermined bending line Packaging areas include a predetermined bending angle with each other.

The Packaging, the z. B. a book cover, a book cover or A jewelry box is intended not only to the interior product Provide protection and possibly serve as an information carrier but also give a permanently attractive appearance, which is why for coating by means of printing processes in addition to conventional printing inks special UV inks are used to seal the packaging Finish the printing process with a UV varnish, which is the Packaging gives an extreme shine.

paints and colors are referred to simply as UV inks or UV inks, when cured with the help of UV radiation and are referred to collectively below as UV materials become.

layers formed from UV materials react in comparison to layers from conventional inks more sensitive to tensile stresses. Even a single kink can cause the surface bursts. In addition, surface cracks are in layers Visibly more visually recognizable from UV materials.

It Practical experiments were carried out in which packaging, made of cardboard coated with a UV material on one side Thickness, a predetermined bending line was introduced by a laser beam from the uncoated side, perpendicular to the packaging surface directed, guided along the desired Sollknicklinie has been. The process parameters were chosen so that in the backing layer of cardboard causes a material removal however, which was close to the coating a material residue was always preserved for coating.

in the Result was along the predetermined bending line, by the effected material removal, generates a wedge-shaped groove whose wedge angle independently from the depth of the groove between 5 ° and 15 °.

Of the Production of subsequent buckling tests led to the result that the stronger the two adjacent to the predetermined bending line Packaging areas were kinked to each other, d. H. the smaller the kink angle was chosen, the more and wider Cracks formed along the predetermined bending line in the decorative layer out.

The when buckling along such a predetermined bending line resulting stress conditions differ only insignificantly from those as they arise if the packaging kinked completely unchecked becomes.

The invention is based on the object to provide a package with a predetermined bending line of a predetermined bending angle, in which a deposited on the outer surface of a carrier layer decorative layer even with multiple buckling not damaged.

It is also an object of the invention suitable for this purpose To find manufacturing process.

These Tasks are for a packaging with the characteristics of Claim 1 and a method with the features of Claim 7 solved.

advantageous Further developments are described in the subclaims.

For a packaging is essential to the invention, that they along the Sollknicklinie has a wedge-shaped material recess, which does not completely penetrate the carrier layer and a wedge angle, the predetermined bending angle for the packaging.

For a method is essential to the invention that the predetermined bending line is generated with two laser cuts, so in the opposite Side of the coated with the decorative layer side of the carrier layer be introduced, that they are in a plane perpendicular to the direction the predetermined bending line at a wedge angle equal to the predetermined bending angle cut within the carrier layer.

The Laser cuts can be made simultaneously with two laser beams or be generated sequentially with only one laser beam. The carrier layer may itself be multilayered or else on the opposite side of the decorative layer be coated.

ever deeper the material recess, or the deeper the two laser cuts within the carrier layer, the more lower are the tensile stresses in the decorative layer Buckling.

Based The drawing shows the packaging and the procedure below exemplified in more detail.

It demonstrate:

1a two laser beams directed at one package

1b a finished packaging according to 1a in the bent state

1c a section from 1b

In A first embodiment is intended to produce a packaging which serves as a book cover.

The Book has a thickness of for example 1 cm, so in the blank The packaging two Sollknicklinien introduced at a distance of 1 cm each with a bending angle β of 90 °, so that a matching book cover is created.

A packaging suitable for this purpose consists for example of a 0.5 mm thick carrier layer 1 made of cardboard, one-sided with a decorative layer 2 is coated from UV material.

To generate the predetermined bending line simultaneously two laser beams 3.1 . 3.2 on the uncoated surface of the carrier layer 1 directed. The laser beams are there 3.1 . 3.2 in a common plane which is perpendicular to the direction of the predetermined bending line and include a wedge angle α with each other.

At the in 1a illustrated embodiment, the wedge angle α is equal to 90 °. The laser beams 3.1 and 3.2 meet at a depth in the carrier layer 1 on each other, which is about 2/3 of the thickness a of the carrier layer 1 equivalent.

To generate a predetermined bending line, the laser beams become 3.1 . 3.2 guided in solid relative position to each other along the desired predetermined bending line.

The resulting material recess is formed by laser ablation and a material chip forming therebetween 4 formed, either already during the emergence, z. B. by suction, or at the end of the process is removed.

The Material recess is idealized a groove with the cross section an isosceles triangle with one enclosed by the thighs Wedge angle α, which is equal to the bending angle β selected which is predetermined by the use of the packaging. The bending angle β usually represents the angle in which the two adjacent to the predetermined bending line packing areas in enclosed condition of the packaging with each other.

In their later function adjacent to the predetermined bending line packaging areas z. T. often between an unbent relative position ( 1a ) and a predetermined by a predetermined bending angle β relative position ( 1b ) be movable toward each other without causing the decorative layer 2 a visible damage suffers.

With a predetermined bending line according to the invention, the process of bending takes place almost without force. Since the substrate is removed over the depth of the material recess over the entire kink area was, the surfaces adjacent to the material recess meet only when the predetermined bending angle β is set. That is, over the depth of the material recess no stresses arise in the carrier material, which would produce a kink movement counteracting force.

In 1c the tension pattern of the packaging is shown in the bent state.

In the remaining residual material along the predetermined bending line, decreasing compressive stresses arise towards the middle of the residual material thickness, which on the decorative side change into increasingly large stresses. The thicker the residual material is, the larger are those in the decorative layer 2 resulting tensile stresses, which is why the residual material thickness as small as possible and only slightly smaller than the thickness a of the carrier layer 1 should be chosen.

Advantageously, the material recess is the thickness of the decorative layer 2 chosen to be shallower than the thickness a of the carrier layer 1 is, resulting in the decorative layer 2 no compressive stresses and only low tensile stresses arise.

For a packaging with a carrier layer 1 made of cardboard of different thickness was used to generate the laser beams 3.1 . 3.2 a CO ₂ laser with a power of 10 W and a pulse frequency of 20 kHz used. The processing speed was z. B. for 0.2 mm thick carrier layers 1 60 m / min and for 1 mm thick carrier layers 1 15 m / min.

The Materialausnehmung can instead of simultaneously with two laser beams 3.1 . 3.2 even with only one laser beam 3.1 be generated by this in the described relative position to the carrier layer 1 first performs the one and then the other a wedge-shaped material recess forming section. However, this lengthens the process duration.

One Advantage of the production of an inventive Packaging with a method according to the invention compared to the production with conventional mechanical Method consists in non-contact machining, whereby no tool wear arises.

Moreover, the desired wedge angle α can be infinitely adjusted solely by a mere change in the relative position of the laser beams 3.1 . 3.2 to each other. In contrast, mechanical tools which are suitable for producing a described material recess, such as peeling blades or milling cutters, must be selected and replaced as a function of the desired wedge angle α.

The production of a packaging according to the invention with mechanical tools also has the disadvantage that during the processing pressure on the packaging and thus the decorative layer 2 is exercised, resulting in special requirements for the surface of the support for the packaging to the decorative layer 2 not to damage.

The described disadvantages of mechanical processes for the production However, a packaging according to the invention are no obstacle to make the packaging so.

The packaging and the manufacturing method claimed therefor are not limited to the carrier layer 1 only coated on one side. You can also not on the decorative layer 2 provided side, whereby a mechanical protection of the carrier layer 1 is reached.

These However, additional layer is along the predetermined bending line cut.

Also, the carrier layer 1 a laminate of several paper or cardboard layers.

1

backing

2

decorative layer

3.1

first laser beam

3.2

second laser beam

4

Media tension

α

wedge angle

β

bending angle

a

thickness the carrier layer

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3742917 [0002, 0003]

Claims (11)

Packaging with a carrier layer ( 1 ) of paper, paperboard or cardboard, unidirectional with a decorative layer ( 2 ) is coated and the at least one the carrier layer ( 1 ) partially dividing predetermined bending line, which divides the packaging in adjacent to the predetermined bending line packaging areas, which in the bent state a predetermined bending angle (β) with each other, characterized in that in the carrier layer ( 1 ) is provided in the direction of the predetermined bending line wedge-shaped material recess having a wedge angle (α) which is equal to the bending angle (β). Packaging according to claim 1, characterized in that the depth of the material recess is only slightly smaller than the thickness (a) of the carrier layer ( 1 ). Packaging according to claim 2, characterized in that the material recess to the thickness of the decorative layer ( 2 ) is shallower than the thickness (a) of the carrier layer ( 1 ). Packaging according to claim 1, characterized in that the material recess by machining by means of laser beams ( 3.1 . 3.2 ) is created. Packaging according to claim 1, characterized that the material recess by means of a paring knife is created. Packaging according to claim 1, characterized in that the decorative layer ( 2 ) consists of a UV material. Method for producing a packaging with a carrier layer ( 1 ) of paper, paperboard or cardboard, unidirectional with a decorative layer ( 2 ) is coated and has at least one predetermined bending line along which the package is divided into packaging areas, which in the bent state a predetermined bending angle (β) with each other include the following steps: a. Directing two laser beams ( 3.1 . 3.2 ) on the surface of not with the decorative layer ( 2 ) coated side of the carrier layer ( 1 ), the laser beams ( 3.1 . 3.2 ) are in a plane perpendicular to the direction of the predetermined bending line and include a wedge angle (α) with each other, which is equal to the bending angle (β) and the laser beams ( 3.1 . 3.2 ) within the carrier layer ( 1 ) and b. Guiding the two laser beams ( 3.1 . 3.2 ) along the predetermined bending line, so that a material recess formed by the material removal caused by the laser beams ( 3.1 . 3.2 ) and a forming material chip ( 4 ) is formed. Method according to claim 7, characterized in that the laser beams ( 3.1 . 3.2 ) only slightly above the decorative layer ( 2 ) meet each other. A method according to claim 8, characterized in that the material recess to the thickness of the decorative layer ( 2 ) is formed shallower than the thickness (a) of the carrier layer ( 1 ). Method according to claim 7, characterized in that the laser beams ( 3.1 . 3.2 ) are guided simultaneously along the predetermined bending line. Method according to claim 7, characterized in that the laser beams ( 3.1 . 3.2 ) are sequentially guided along the predetermined bending line.