Creasing plate for creasing sheets of paper, cardboard, carton, foil or similar material
阅读说明:本技术 一种用于对纸、纸板、纸箱、箔片或类似材料的片材进行压痕的压痕板 (Creasing plate for creasing sheets of paper, cardboard, carton, foil or similar material ) 是由 R·瓦尔特里奥 于 2018-06-25 设计创作,主要内容包括:一种用于对纸、纸板、纸箱、箔片或类似材料的片材(12)进行压痕的压痕板(24),压痕板(24)由可塑性变形的材料组成,并且包括至少一个压痕突起(26),压痕突起(26)由多个小的塑性变形的区域形成,该区域彼此融合以形成压痕突起(26)。(A creasing plate (24) for creasing a sheet (12) of paper, paperboard, carton, foil or similar material, the creasing plate (24) consisting of a plastically deformable material and comprising at least one creasing protrusion (26), the creasing protrusion (26) being formed by a plurality of small plastically deformed areas, which areas merge with each other to form the creasing protrusion (26).)
1. A creasing plate (24) for creasing a sheet of paper, paperboard, carton, foil or similar material, the creasing plate (24) consisting of a plastically deformable material and comprising at least one creasing protrusion (26), the creasing protrusion (26) being formed by a plurality of small plastically deformed areas, which areas merge with each other to form the creasing protrusion (26).
2. The creasing plate of claim 1, wherein the creasing plate (24) has a thickness in the range of 0.2 to 0.6 mm.
3. Creasing plate according to claim 1 or 2, wherein the creasing plate (24) is made of carbon steel or stainless steel.
4. Creasing plate according to any of the preceding claims, wherein the height (h) of the creasing protrusions (26) is 0.6-1.6 mm, in particular 1.2 mm.
5. The creasing plate of any of the preceding claims, wherein the creasing protrusion has a radius at its apex of 0.2 to 0.8mm, particularly 0.35 to 0.55 mm.
6. Creasing plate according to any of the preceding claims, wherein the cross-section of the creasing protrusion has a width at its bottom of 1-3 mm, preferably about 2 mm.
7. The creasing plate of any of the preceding claims, wherein the creasing plate (24) is a curved plate having a first clamping area at a front end and a second clamping area at a rear end.
8. Creasing plate according to any of the preceding claims, wherein at least one drive chamfer (27) is provided, the drive chamfer (27) extending around a majority of the circumference of the creasing plate (24).
9. The creasing plate of claim 8, wherein the drive fillet is formed by one substantially continuous fillet.
10. The creasing plate of claim 8, wherein the drive fillet is formed from a plurality of substantially discontinuous fillets.
11. The creasing plate of claim 10, wherein the plurality of substantially discontinuous rounded corners are aligned in a circumferential direction.
12. The creasing plate of claim 10 or 11, wherein the plurality of substantially discontinuous fillets are at one angle or at more than one angle relative to the circumferential direction.
13. Creasing plate according to any of claims 8-12, wherein the drive fillet (27) is added to the creasing plate (24).
14. The creasing plate of claim 13, wherein the drive fillet (27) is comprised of a cured epoxy material.
15. Creasing plate according to any of the preceding claims, wherein at least two straight creasing protrusions (26) are provided, the creasing protrusions (26) being at a distance of less than 3mm from each other.
16. Creasing plate according to claim 15, wherein the creasing protrusions (26) extend at an angle of 15-90 ° with respect to each other.
17. The creasing plate of claim 15 or claim 16, wherein the creasing protrusion (26) merges with the rest of the creasing plate according to a radius of 0.2 to 1 mm.
18. The creasing plate of any of the preceding claims, wherein the creasing plate is comprised of a sheet metal material.
19. The creasing plate of any of claims 1 to 17, wherein the creasing plate is comprised of a non-metallic material, such as a polymeric material.
Technical Field
The present invention relates to a creasing plate for creasing sheets of paper, paperboard, carton, foil or similar material.
Background
The creasing machine is used to create one or more creases in the sheet from which folded blanks are cut. Each indentation forms a type of "hinge" that allows the subsequently formed blank to be folded in a well-defined position.
The indenter may be formed as a device or system that may be a stand-alone unit or integrated into a larger machine or system (e.g., a printer or finisher).
The sheet may be made of cardboard, carton or foil and it may be provided to the creasing machine as part of a web, either individually or in a continuous manner.
The indentations are formed by locally applying pressure on the sheet. To this end, it is known that creasing blades press on the surface of the sheet to create a crease. It is also known to provide local protrusions on the indentation tool, for example by etching those parts of the indentation tool that should not protrude or by locally applying a plastic material in a liquid state and then curing it.
The creasing tool may be substantially flat and may move back and forth in a substantially perpendicular direction relative to the plane in which the sheet extends, or may be substantially cylindrical and may rotate so as to engage on the sheet as it is transferred through the creasing area.
A problem with all creasing machines is that it is difficult to quickly adapt to the specific creasing pattern to be applied to the sheet. This has been a problem since digital printing allows very rapid changes from one print job to another.
If the indentation tool is to be manufactured by an etching process, it may take several hours to use a new indentation tool. If the indentation protrusion is formed by applying a plastic material to the carrier, the manufacturing time may be shorter, depending on the time required for curing the plastic material. However, the lifetime of such indentation tools is significantly shorter than the lifetime of indentation tools comprising etched steel plates. In any case, the step of adapting the creasing machine to the new creasing job is the bottleneck when the creasing machine is used in conjunction with a digital printer.
Disclosure of Invention
The invention aims to provide a device which can make an indenter quickly prepare for carrying out a new indentation operation.
This object is achieved by a creasing plate for creasing a sheet of paper, paperboard, carton, foil or similar material, the creasing plate consisting of a deformable material and comprising at least one creasing protrusion formed by a plurality of small plastically deformed areas merging into each other to form the creasing protrusion.
The invention is based on the concept of using a creasing plate, wherein the creasing protrusions are formed by a large number of punching strokes, each punching stroke resulting in a creasing protrusion. This allows two advantages to be achieved. First, the service life of the creasing plate is long, since the wear of the creasing protrusions is small, simply because it is made of a durable material, such as metal. The strain hardening that inevitably occurs during the stamping process contributes to the wear resistance of the indented panel. Secondly, a single creasing plate may be quickly manufactured with little effort by e.g. a turret punch or a plate punch.
The thickness of the indentation plate may be in the range of 0.2 to 0.6 mm. Sheet material (e.g. metal) having such a thickness has on the one hand sufficient strength to achieve a long service life and on the other hand does not require excessive punching forces.
Preferably, the creasing plate is made of carbon steel or stainless steel. This material is advantageous in terms of its mechanical strength and also does not suffer from corrosion problems.
The height of the indentation protrusion may be about 0.6 to 1.6 mm. Preferably, a value of about 1.2mm may be used, even if this depends on the material to be indented. A value of 1.2mm has proven to be a good result for cartons.
The radius of the indentation protrusion at the apex of the indentation protrusion may be about 0.2 to 0.8mm, more preferably about 0.35 to 0.55 mm. These values have proven to be a good compromise between sharp, well-defined indentations on the one hand and a small risk of breaking or damaging the material of the creasing plate during manufacture on the other hand.
Preferably, the cross-section of the indentation protrusion is about 1 to 3mm, preferably about 2mm, wide at its base. The width has an important effect on the impression, and for thinner material the width is preferably chosen smaller, whereas for thicker material (e.g. corrugated board) the larger width should be used.
According to a preferred embodiment, the creasing plate is a curved plate having a first clamping area at a front end and a second clamping area at a rear end. Such a creasing plate may be clamped on the creasing roller very quickly and reliably.
According to one embodiment of the invention, a drive fillet is provided on the creasing plate, which drive fillet extends around a substantial part of the circumference of the creasing drum. The drive fillet is chosen with regard to its height so that it exerts a constant driving force on the sheet advancing through the indentation area between the rollers, thereby ensuring that the sheet is driven correctly independently of the indentation on the creasing plate.
The drive fillet may be formed by one substantially continuous fillet, or alternatively by a plurality of substantially discontinuous fillets, as desired.
If a plurality of substantially discontinuous rounded corners are used, these rounded corners are preferably aligned in the circumferential direction so as to constantly interact with the sheet material.
It is also possible to have a plurality of substantially discontinuous fillets at one angle or at more than one angle with respect to the circumferential direction.
The drive fillet may be formed by a plastically deformed portion of the creasing plate in a similar manner to the creasing protrusions, or may be created by adding a strip of material, for example made of an epoxy material, to the creasing plate. This increases the flexibility as the height, width and location of the drive fillet can be set to be appropriate for each new creasing job and the creasing plate used therewith.
According to a preferred embodiment, at least two straight creasing protrusions are provided, the creasing protrusions being at a distance of less than 3mm from each other. This small distance between adjacent indentation protrusions ensures that only little non-indented material remains between the indentations, thereby ensuring good quality of the indentations.
Preferably, the creasing protrusions extend at an angle of 15 ° to 90 ° relative to each other, thereby allowing sufficient flexibility in the creasing produced on the sheet.
According to a preferred embodiment, the indentation protrusion merges with the rest of the indentation plate according to a radius of 0.2 to 17 mm. A smaller radius is advantageous for keeping the indentations at a short distance from each other, whereas a larger radius is advantageous for achieving a smooth transition of the creasing plate from a deformed material to an undeformed material.
The creasing plate is preferably constructed from sheet metal. Therefore, desired properties (such as plastic deformation and the ability to have high wear resistance) can be obtained at low cost.
However, other materials, in particular non-metallic materials (e.g. polymeric materials), may also be used for manufacturing the creasing plate.
Drawings
The present invention will now be described with reference to the accompanying drawings. In the drawings:
figure 1 schematically shows a creasing machine,
figure 2 schematically shows an embodiment of a creasing tool used in the creasing machine of figure 1,
figure 3 schematically shows a second embodiment of a creasing tool for use in the creasing machine of figure 1,
FIG. 4 shows a cross-sectional view of a creasing plate mounted on a creasing tool, the creasing plate creating a folding crease by pressing a sheet against a reversing element,
figure 5 schematically shows the process of forming creasing protrusions on a creasing plate,
figures 6a to 6c show three different embodiments of punches used in the creasing machine of figure 1,
figures 7a and 7b show a first embodiment of the die used in the creasing machine of figure 1,
figure 8 shows a second embodiment of the mould used in the creasing machine of figure 1,
figure 9 shows a mould according to the prior art,
figure 10 shows a cross section of the punch and the die when the creasing-plate blank is deformed,
FIGS. 11a and 11b schematically show the mold of FIGS. 7a and 7b when two fused creasing protrusions are produced, and the folding creases produced by these folding protrusions, and
figures 12a to 12e schematically show the die of figures 7a and 7b for making three fused folding protrusions, as well as the folding impressions produced by these creasing protrusions and the corresponding blanks cut out of the sheet and the boxes made from the blanks,
figures 13a and 13b show in more detail the creasing protrusions obtained by the punch of figures 6b and 6c,
figures 14a and 14b show a cross-section of a creasing protrusion for creasing a carton,
figures 15a and 15b show in cross-section the creasing protrusions and the creasing obtained thereby for creasing a corrugated carton,
figures 16a and 16b show the creasing tool of figure 3 in a first state and a second state,
figure 17 schematically shows in more detail a creasing tool incorporating a control of the rotational speed of the drum,
figure 18 shows a schematic cross-sectional view of the creasing tool illustrating the rotational speed of the drum,
figure 19 shows on a larger scale the contact areas between the two cylinders of the creasing tool and the sheet to be provided with the crease,
figures 20a to 20c show a top view of the creasing plate, a cross-section through a creasing tool provided with a drive fillet and a cross-section through a portion of the creasing plate provided with a drive fillet and a creasing protrusion,
figures 21a to 21c show perspective views of the cylinder for the creasing tool, enlarged views of the clamping mechanism for clamping the creasing plate and for clamping the resilient layer of the counter cylinder,
figures 22a to 22g show different steps of using counter-cylinders according to alternative embodiments,
figures 23a to 23d show in more detail the roller used in the creasing tool, an
Figures 24a and 24b show the counter cylinder in more detail.
Detailed Description
In fig. 1, the creasing machine is schematically shown. It comprises a
The
The
The
It is also possible to integrate into the creasing area 14a cutting system that allows the separation of the individual blanks from the sheet.
In the creasing
Fig. 2 shows a first example of a creasing tool and a counter element for use in the creasing
The indentation tool is here in the form of a
The
The
A second embodiment of the creasing tool and the reversing element is shown in fig. 3. Here, the creasing tool is provided in the form of a creasing
The
The interaction between the creasing
The creasing
In order to produce the
In fig.
Furthermore, the punching
Fig. 5 schematically shows how the stamping
Each stroke produces a small plastic deformation area on the creasing plate blank 24', the entire plastic deformation area forming the creasing
Fig. 6a to 6c show different embodiments of the punch arranged on the
In fig. 6a, a
Relatively small radii are provided at the ends of the projecting
In fig. 6b, the
In fig. 6c, a
The height H (see fig. 10) by which the protruding
Fig. 7a and 7b show an embodiment of a die 46 adapted to cooperate with the
The
As can be seen in fig. 7a and 7b, the
It can also be seen in fig. 7a that the outer contour of the
At the opposite end of the
An
In fig. 8, a different embodiment of the
In fig. 9, a
In fig. 10, a schematic cross-sectional view through a
During local deformation of the creasing plate blank 24 'to form the creasing
This avoids tensions in the creasing-plate blank 24' that may cause undesired deformations.
In fig. 11a and 11b, it is schematically shown how
The
The result of directly adjacent creasing
In fig. 12a to 12e, it is shown how three creasing
These indentation protrusions are intended to fold into a crash proof lock bottom box or a compound lid (compoteflap) for a four-cornered or hexagonal tray.
The
The creasing plate 24 (either newly manufactured or removed from inventory 62) is taken over (take over) by the
If the creasing tool is a punch, the plate is mounted in a flat shape. If the creasing tool is a creasing roller, the creasing
As mentioned above, punches with larger radii on opposite sides (precisely: larger radii on opposite sides of their protruding portion 45) are used to obtain creasing
Fig. 13b shows two
It can be seen that the ends of the indentation projection at the opposite end terminate with a larger radius.
Fig. 14a and 14b show a cross-sectional view through a creasing
In fig. 14a, the thickness of the indentation plate is in the range of 0.4mm, while the height h of the indentation protrusion is in the range of 0.6 to 1.6 mm.
The radius R at the apex of the creasing
Preferred values for the height h are in the range of 1.2mm, while preferred radii may be 0.35mm and 0.525 mm.
In fig. 15a, creasing
The wider conical shaped profile of the creasing
Also, typical heights of the indentation protrusions 26 are in the range of 1.2 mm. A value of about 0.5 to 0.6mm, in particular 0.53mm, is suitable for the radius R at the apex of the contour.
A value of about 0.5mm for the radius R at the bottom of the
The inscribed circle here may be 1.05mm in diameter.
It is important to note that the creasing
Fig. 16a and 16b illustrate an advantageous aspect of the creasing tool.
When changing from a creasing paperboard to a creasing corrugated box, the direction of the creasing must be changed. This can be easily done by changing the function of the two
In fig. 16a, the upper roller is used as
In the configuration shown in fig. 16b, the configuration is reversed. The
However, the same set of rollers is used. The function of the roller is determined only by the "tool" (creasing
The functional outer radius of the two rollers depends on the tool mounted thereon. In particular, the functional outer radius of the cylinder provided with the
The plane in which the
Another consequence of the difference in the functional radii of the two cylinders is that the rotational speeds of the cylinders are slightly different, since the tangential speeds at the joining point of the
To allow individual control of the rotational speed, each drum is provided with a
In addition, the
Based on the effective radius REThe speed V of the advance of the
In order to manufacture the creasing
As shown in fig. 18 and 19, the creasing
Fig. 18 shows in an example the actual length L of a straight line between two
In fig. 20a and 20b, another aspect of the creasing tool is shown.
Typically, the
In order to ensure that the
However, the
The
Figures 21a to 21c show the
The
Fig. 22a to 22g show another aspect of the indenter.
In this embodiment, a sleeve of
In fig. 22a, the creasing
To shape the
After increasing the distance between the
Subsequently, the creasing
After completion of a certain indentation work, the
When the
Fig. 23a shows the creasing
The
In the release position, the clamp pins 62 are spread apart compared to the clamping position. Referring to fig. 23c and 23d, the distance between the clamp pins 62 in the clamped position is less than the distance in the released position. In other words, when the gripping pins are in their gripping position, the creasing
The gripping
A release mechanism is provided for moving the
The cam mechanism has a plurality of
The
In the rest position, the
In the deployed position, the cams urge the
The amount of rotation of the
To install the creasing-plate, the clamping
The holding
Fig. 24a and 24b show the
The
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