WO1996026048A1 - Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material - Google Patents

Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material Download PDF

Info

Publication number
WO1996026048A1
WO1996026048A1 PCT/FI1996/000107 FI9600107W WO9626048A1 WO 1996026048 A1 WO1996026048 A1 WO 1996026048A1 FI 9600107 W FI9600107 W FI 9600107W WO 9626048 A1 WO9626048 A1 WO 9626048A1
Authority
WO
WIPO (PCT)
Prior art keywords
slitting
web
score
fibrous material
blade assembly
Prior art date
Application number
PCT/FI1996/000107
Other languages
French (fr)
Inventor
Henrik Roos
Original Assignee
Enzo-Gutzeit Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Enzo-Gutzeit Oy filed Critical Enzo-Gutzeit Oy
Priority to AU47208/96A priority Critical patent/AU4720896A/en
Publication of WO1996026048A1 publication Critical patent/WO1996026048A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/088—Means for treating work or cutting member to facilitate cutting by cleaning or lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/24—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter
    • B26D1/245—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter for thin material, e.g. for sheets, strips or the like

Definitions

  • the present invention relates to a method according to the preamble of claim 1 and a compatible apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material.
  • Paperboard is conventionally slit using rotating disk-like blades for shear-cut slitting.
  • the most typically used slitter assembly comprises a sharpened, disk-like, scissor- cutting rotating top blade and a rotating bottom blade having a cup-like shape for supporting the web.
  • the blade pair is preceded by a guide roll serving to prevent the web from fluttering.
  • the slitting result is optimized by vary ⁇ ing the knife materials and attack angles so that maximally smooth and dust-free slitting is achieved.
  • the slitting operation pro ⁇ cutes dust and lint, because the symmetrical edge of the rotary cutting knife imposes a wedging force on the web. Due to such wedging, the web tends to tear apart even before reaching the slitting point in the nip between the rotary knives.
  • the wedging force is the larger the thicker the web being slit.
  • the web of paper ⁇ board or similar high-bulk fibrous material is passed over a guide roll to the slitting point in the blade assembly formed by the top and bottom shear-cutting blades for slitting the paperboard or similar fibrous material web.
  • the goal of the invention is achieved by compressing the paperboard web to form a compression line such as a score on the web using an element (e.g., a sharp-edged disk) made from a suitable material and aligned so that the slitting blade assembly cutting the web is coincident with the formed score.
  • an element e.g., a sharp-edged disk
  • the subsequent slitting operation will occur with less dust/lint formation than is possible without such a precompression.
  • the wedging force and resulting tear im- posed on the web prior to the slitting point will be re ⁇ quizd as the caliper of the web to be slit is thinner than conventional.
  • the fibers in the compressed web material provide higher mutual adherence at the slitting instant thus contributing to an improved slitting result.
  • the open (lint releasing) slit edge has a smaller area than the edge of conventionally slit sheet edge.
  • the compressed state of the sheet edge retains the loose particles and fibers thus preventing them from becoming loose in a printing machine, for instance.
  • the compressing disk is advantageously a scoring disk adapted to rotate freely about its shaft.
  • the disk is placed as close as possible in front of the rotating slitting blades, because depending on the properties of the web to be slit the compressed score generally tends to decompress thus reducing the effect of the scoring opera ⁇ tion.
  • the score width and compressive force are selected case-by-case according to the material to be slit.
  • test runs of the above-described method were performed using dust samples tape-stripped from the slit sides of sheet stacks for evaluation of the test run re ⁇ sults in combination with visual examinations of the slit ⁇ ting result. Due to the qualitative character of these evaluation methods, no numerical comparative scales data can be applied. However, on the basis of the test run re ⁇ sults it is plausible that essentially reduced dust/lint formation is attained by virtue of the present method. Re- sultingly, a printing machine can now be run for almost twice the number of sheets previously possible with conven ⁇ tionally slit sheets, before the printing machine must be stopped for cleaning away the dirt formed by accumulated lint.
  • Figure 1 is a simplified side view of a slitter embodiment according to the invention.
  • Figure 2 is a perspective view of the embodiment shown in Fig. 1;
  • Figure 3 is a perspective view of the score formed on the web and the slitting of the score bottom.
  • the slitter apparatus comprises a guide roll 4 and a slitting blade assembly 5 formed by a top blade and a bottom blade.
  • the web 1 is passed over the guide roll 4 to the slitting point between the top blade and the bottom blade of the slitting blade assembly 5 for slitting the paperboard or similar fibrous web.
  • a means 3 is adapted in front of the shear-cutting blade assembly 5 formed by the top and bottom blades for the purpose of providing the web with a compression score line 2 running coincident with the slit to be made on the web 1.
  • a compression score line 2 is formed with the help of a means 3 so that both the wedging force imposed by the blade assembly 5 on the web 1 in front of the slitting point and the edge area of the ready-slit sheet after the slitting point 6 will be reduced.
  • the required means 3 e.g., a rotating disk), most advantageously a scoring disk, is mounted so that the compressed area 2 such as a score will be guided to the slitting point 6 formed by the blade assembly 5 for slitting the web 1.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Nonmetal Cutting Devices (AREA)

Abstract

The present invention relates to a method for reducing dust/lint formation in the shear-cutting slitting of paperboard or similar fibrous material web. In the method according to the invention, the web of paperboard or similar fibrous material is passed over a guide roll to the slitting point in the shear-cutting blade assembly for slitting the paperboard or similar fibrous material web. The method according to the invention is essentially characterized in that, either prior to the slitting of the paperboard or similar fibrous material web or immediately in conjunction with such a slitting operation, on the web is formed a linear compressed area aligned coincident with the slit to be made on the web. The thus formed linear compressed area has a caliper thinner than that of the uncompressed web and is subsequently guided to the slitting point in the shear-cutting blade assembly.

Description

Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material
The present invention relates to a method according to the preamble of claim 1 and a compatible apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material.
Paperboard is conventionally slit using rotating disk-like blades for shear-cut slitting. The most typically used slitter assembly comprises a sharpened, disk-like, scissor- cutting rotating top blade and a rotating bottom blade having a cup-like shape for supporting the web. The blade pair is preceded by a guide roll serving to prevent the web from fluttering. The slitting result is optimized by vary¬ ing the knife materials and attack angles so that maximally smooth and dust-free slitting is achieved. With thick and porous fibrous material webs, the slitting operation pro¬ duces dust and lint, because the symmetrical edge of the rotary cutting knife imposes a wedging force on the web. Due to such wedging, the web tends to tear apart even before reaching the slitting point in the nip between the rotary knives. The wedging force is the larger the thicker the web being slit.
It is an object of the present invention to achieve a slitter apparatus free from the shortcomings of the above- described state-of-the-art techniques. The characterizing properties of the method and apparatus according to the invention are disclosed in the annexed claims.
It is an object of the invention to provide a method and apparatus suited for slitting porous, high-bulk paperboard or other fibrous material so that the slitting operation causes essentially less dust/lint formation than conven¬ tional methods. According to the method, the web of paper¬ board or similar high-bulk fibrous material is passed over a guide roll to the slitting point in the blade assembly formed by the top and bottom shear-cutting blades for slitting the paperboard or similar fibrous material web.
The goal of the invention is achieved by compressing the paperboard web to form a compression line such as a score on the web using an element (e.g., a sharp-edged disk) made from a suitable material and aligned so that the slitting blade assembly cutting the web is coincident with the formed score. As the web is in this manner made denser and thinner at the processed score than the uncompressed paper¬ board web, the subsequent slitting operation will occur with less dust/lint formation than is possible without such a precompression. The wedging force and resulting tear im- posed on the web prior to the slitting point will be re¬ duced as the caliper of the web to be slit is thinner than conventional. Furthermore, the fibers in the compressed web material provide higher mutual adherence at the slitting instant thus contributing to an improved slitting result. Since the sheet edge remains in its compressed state after slitting, the open (lint releasing) slit edge has a smaller area than the edge of conventionally slit sheet edge. Addi¬ tionally, the compressed state of the sheet edge retains the loose particles and fibers thus preventing them from becoming loose in a printing machine, for instance.
The compressing disk is advantageously a scoring disk adapted to rotate freely about its shaft. The disk is placed as close as possible in front of the rotating slitting blades, because depending on the properties of the web to be slit the compressed score generally tends to decompress thus reducing the effect of the scoring opera¬ tion. The score width and compressive force are selected case-by-case according to the material to be slit.
Because reliable equipment for dust/lint measurement is not available, the test runs of the above-described method were performed using dust samples tape-stripped from the slit sides of sheet stacks for evaluation of the test run re¬ sults in combination with visual examinations of the slit¬ ting result. Due to the qualitative character of these evaluation methods, no numerical comparative scales data can be applied. However, on the basis of the test run re¬ sults it is plausible that essentially reduced dust/lint formation is attained by virtue of the present method. Re- sultingly, a printing machine can now be run for almost twice the number of sheets previously possible with conven¬ tionally slit sheets, before the printing machine must be stopped for cleaning away the dirt formed by accumulated lint.
In the following, the invention will be described in greater detail by means of exemplifying embodiments with reference to the annexed drawings in which
Figure 1 is a simplified side view of a slitter embodiment according to the invention;
Figure 2 is a perspective view of the embodiment shown in Fig. 1; and
Figure 3 is a perspective view of the score formed on the web and the slitting of the score bottom.
Referring to Figs. 1 and 2, therein is shown a simplified embodiment of the slitter arrangement according to the invention capable of reducing dust/lint formation in the slitting of paperboard or similar fibrous material. The slitter apparatus comprises a guide roll 4 and a slitting blade assembly 5 formed by a top blade and a bottom blade. The web 1 is passed over the guide roll 4 to the slitting point between the top blade and the bottom blade of the slitting blade assembly 5 for slitting the paperboard or similar fibrous web. The characterizing detail of the invention is therein that a means 3 is adapted in front of the shear-cutting blade assembly 5 formed by the top and bottom blades for the purpose of providing the web with a compression score line 2 running coincident with the slit to be made on the web 1. Such a compression score line 2 is formed with the help of a means 3 so that both the wedging force imposed by the blade assembly 5 on the web 1 in front of the slitting point and the edge area of the ready-slit sheet after the slitting point 6 will be reduced. The required means 3 (e.g., a rotating disk), most advantageously a scoring disk, is mounted so that the compressed area 2 such as a score will be guided to the slitting point 6 formed by the blade assembly 5 for slitting the web 1.
To a person versed in the art, it is obvious that the different embodiments of the invention are not limited to the above-described exemplifying embodiment, but rather may be varied within the scope and spirit of the annexed claims.

Claims

Claims:
1. A method for reducing dust/lint formation in the shear- cutting slitting of paperboard or similar fibrous material web, in which method the web (1) of paperboard or similar fibrous material is advantageously passed over a guide roll (4) to the slitting point (6) in the shear-cutting blade assembly (5) formed by top and bottom shear-cutting blades for slitting the paperboard or similar fibrous material web, c h a r a c t e r i z e d in that, either prior to the slitting of the paperboard or similar fibrous material web or immediately in conjunction with such a slitting operation, on the web (1) is formed a linear compressed area (2) having a caliper thinner than that of the uncom- pressed web (1) and subsequently the thus formed linear compressed area (2) is guided to the slitting point (6) in the shear-cutting blade assembly (5).
2. A method as defined in claim 1, c h a r a c t e r - i z e d in that on the web (1) is formed a linear com¬ pressed area (2) aligned essentially coincident with the slitting line, whereby said linear compressed area (2) is advantageously a compression score line.
3. A method as defined in claim 1 or 2, c h a r a c ¬ t e r i z e d in that, for the purpose of reducing dust/lint formation, said score-like compression line (2) is formed by a means (3) optimized for both reducing the wedging force imposed by the blade assembly (5) on the web ( 1) in front of the slitting point and achieving advanta¬ geous internal support of the compressed fibrous material in the score-like compression line (2) in the slitting point (6) and further for reducing the edge area of the ready-slit sheet after the slitting point (6).
4. A method as defined in any foregoing claim, c h a r ¬ a c t e r i z e d in that the score width and compressive force are made adjustable in the formation of said score¬ like compression line (2).
5. A slitter apparatus with reduced dust/lint formation in the slitting of paperboard or similar fibrous material, said apparatus comprising a guide roll (4) and a shear- cutting blade assembly (5) formed by a top blade and a bottom blade, c h a r a c t e r i z e d in that, either prior to the shear-cutting blade assembly (5) formed by the top and bottom blades or immediately in conjunction therewith, is adapted a means (3) capable of providing the web with a linear score-like compressed area (2) running coincident with the slit to be made on the web (1) and that said means (3) is mounted so that said linear score-like compressed area (2) will be guided to the slitting point (6) formed by the blade assembly (5).
6. A slitter apparatus as defined in claim 5, c h a r ¬ a c t e r i z e d in that said means (3) is a disk or similar element adapted to be freely rotating about its shaft.
7. A slitter apparatus as defined in claim 6, c h a r ¬ a c t e r i z e d in that said disk-like means (3) is made adjustable with regard to said blade assembly (5) in the cross-machine, machine and elevation directions.
8. A slitter apparatus as defined in claim 6, c h a r ¬ a c t e r i z e d in that said linear score-like com- pressed area (2) formed by virtue of said disk-like means (3) is made adjustable with regard to its score width and compressive force.
9. A slitter apparatus as defined in any of claims 5 - 8, c h a r a c t e r i z e d in that said means (3) is provided with an edge profile capable of producing a score¬ like compressed area (2) that reduces the wedging force imposed by said blade assembly (5) on the web (1) and achieves advantageous internal support of the compressed fibrous material in the score-like compressed area (2) in the slitting point (6) and further provides reduced edge area in the ready-slit sheet after the slitting point (6).
10. A slitter apparatus as defined in any of claims 5 - 9, c h a r a c t e r i z e d in that said means (3) for forming the linear score-like compressed area (2) on the web (1) is mounted in the immediate vicinity of said blade assembly (5), essentially aligned on the same line with the slit to be made on the web by said blade assembly (5).
11. A slitter apparatus as defined in any of claims 5 - 10, c h a r a c t e r i z e d in that said means (3) is advantageously mounted above the guide roll (4) supporting the web (1) being slit.
PCT/FI1996/000107 1995-02-24 1996-02-22 Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material WO1996026048A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47208/96A AU4720896A (en) 1995-02-24 1996-02-22 Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI950858A FI100224B (en) 1995-02-24 1995-02-24 Method and apparatus for reducing cutting dust from cutting cardboard or similar fibrous material
FI950858 1995-02-24

Publications (1)

Publication Number Publication Date
WO1996026048A1 true WO1996026048A1 (en) 1996-08-29

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ID=8542927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000107 WO1996026048A1 (en) 1995-02-24 1996-02-22 Method and apparatus for reducing dust/lint formation in the slitting of paperboard or similar fibrous material

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AU (1) AU4720896A (en)
FI (1) FI100224B (en)
WO (1) WO1996026048A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961025A1 (en) * 1969-12-05 1971-09-23 Gen Corrugated Machinery Method and device for longitudinal cutting of corrugated cardboard sheets
US4091697A (en) * 1974-12-09 1978-05-30 Glass Master Sales And Leasing Corporation Scrap stripper and chopper with conveyor
DE3042042A1 (en) * 1979-11-11 1981-06-04 Cocon Kunststoffen B.V., Arkel Cutting plastic foam into strips - where delayed elastic recovery foam is compressed and cut with freely revolving discs(NL 1.6.81)
US4682523A (en) * 1985-02-04 1987-07-28 Owens-Corning Fiberglas Corporation Methods of making glass wool blowing insulation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961025A1 (en) * 1969-12-05 1971-09-23 Gen Corrugated Machinery Method and device for longitudinal cutting of corrugated cardboard sheets
US4091697A (en) * 1974-12-09 1978-05-30 Glass Master Sales And Leasing Corporation Scrap stripper and chopper with conveyor
DE3042042A1 (en) * 1979-11-11 1981-06-04 Cocon Kunststoffen B.V., Arkel Cutting plastic foam into strips - where delayed elastic recovery foam is compressed and cut with freely revolving discs(NL 1.6.81)
US4682523A (en) * 1985-02-04 1987-07-28 Owens-Corning Fiberglas Corporation Methods of making glass wool blowing insulation

Also Published As

Publication number Publication date
FI950858A0 (en) 1995-02-24
FI950858A (en) 1996-08-25
FI100224B (en) 1997-10-31
AU4720896A (en) 1996-09-11

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