CA1080117A - Dustfree cutting of a mineral wool web - Google Patents
Dustfree cutting of a mineral wool webInfo
- Publication number
- CA1080117A CA1080117A CA305,801A CA305801A CA1080117A CA 1080117 A CA1080117 A CA 1080117A CA 305801 A CA305801 A CA 305801A CA 1080117 A CA1080117 A CA 1080117A
- Authority
- CA
- Canada
- Prior art keywords
- web
- mineral wool
- cutting
- knife blade
- dustfree
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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
- 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
- B26D1/143—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 rotating about a stationary axis
- B26D1/15—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 rotating about a stationary axis with vertical cutting member
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Glass Compositions (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process for dustfree cutting of a mineral wool web by per-forming the cutting with a knife blade which has a peripher-ical speed in the direction of the movement of the mineral web that is somewhat higher than the velocity of the web and which knife blade has an edge of a form that has a cleaving, not a cutting and chips forming effect.
A process for dustfree cutting of a mineral wool web by per-forming the cutting with a knife blade which has a peripher-ical speed in the direction of the movement of the mineral web that is somewhat higher than the velocity of the web and which knife blade has an edge of a form that has a cleaving, not a cutting and chips forming effect.
Description
~ 10E~0117 Dustfree cutting of a mineral wool web In the production of mineral wool products for isolating purposes the formed mineral wool is collected on a transport band, whereby the velocity of the band determines the production capacity. The mineral wool is forming a mat, which is also called a web, which mostly contains a thermocuring binding agent. After the curing which takes place in a special curing oven and the subsequent cooling the edges of the web are so uneven that they must under-go some sort of a levelling operation. Additionally the web must be cut in longitudinal and transversal directions in order to ob-tain mineral products of a desired and easily handled form.
The technique generally used today for the said dividing or cut-ting operations in the production of mineral wool products is saw-ing with rotating toothed blades furnished with cutters of hard metal or with fast rotating abrasive wheels. This technique is, however, undesirable because of the dust being formed and which is difficult to overcome in order to get an acceptable working atmosphere. This technique is also causing a waste of material which in the long run becomes considerable.
The purpose of this invention is to develop a new process for cut-ting mineral webs where the development of dust and ma~or waste of material are eliminated.
In order to obtain this purpose cutting with rotating knives has been tried on mineral webs in the known way which is used in the textile industry. Characterizing for this technique are partly the form of the edge of the rotating knife blades, which is such that the edge is slitting or cleaving the staple of fabric layers, and partly the very high rotating speed of the knife blades. These characteristics are very suitable for products constituted of flex-ible fabric layers and the result is consequently good, which means that the trace is smooth and the development of dust insignificant and that the blade can be used for a long time without sharpening.
Using the same technique on mineral wool webs which are relatively . . . .
, :.~, . , ,, , . .:
' . ~ ' ,' , :: '' -, . :: ., :,, - : : .
- ..:. ~ :
dense and hard and have a considerable thickness between about 10 to 300 mm has not been successfu]. The development of dust and waste of material have in fact essentially decreased but the fric-tion heat grows high and causes deformation of the blade and un-sharpness after a short use thereof.
Considering these negative experiences another process has been tried, that is levelling and longitudinal and transversal cutting of a moving mineral wool web with stationary blades of the same ~-form as above. Surprisingly enough such a technique has been adapted on stiff mineral wool webs with a satisfying result. When adapting the same process on more flexible webs the tearing actions is, however, too big. The conclusion that also these flexible webs can be cut with the same knife-formed tool provided the blade is given a cutting movement, preferably a rotating movement, the velocity of which is somewhat higher than the velocity of the material web, has, however, been reached through tests. There exists no development of dust in this technique.
The new process is thus characterized in that the cutting is per-formed with a knife blade having a peripherical speed in the di-rection of the movement of the web which is somewhat higher than the velocity of the mineral wool web and in that edge of the knife blade has a form with a cleaving, not a cutt.tng effect, which latter action means that chips are formed during the cutting.
The essence of the new process is constituted of the fact that the knife blade has a smooth edge tapering towards the top of the edge and having a slitting or cleaving effect contrary to the toothed edge of a sawing blade wherein the teeth are formed to cut chips during the sawing. As mentioned above saw toothed blades have been used until now for the cutting of mineral wool webs and it is therefore quite unexpected that a smooth cleaving edge with a relatively low rotation rate is able to cut these webs and produce a clean trace without the development of dis-turbing dust.
,., ~, ' ~, .;, ' .' ~ : , :: . .
-: r - 10~0117 In a preferable embodiment of the process the knife blade has a rotating movement and further it is preferable that the peripherical rate of the knife blade is about 1.1 - 10 times the rate of the mineral wool web. This relation is empirically determined for each web and is primarily dependent on the thick-ness and the density of the web, the amount of binding agent in the web and on the degree of hardness of the web.
The velocity control of the peripherical speed of the knife blade is preferably performed synchronically with the velo-city of the wool web, for example, with a continuous-current motor.
As compared with the prior known sawing process the following advantages are obtained - the development of dust is so insignificant that the apparatus for removing of dust by suction are superfluous, - thanks to the very small friction heat the tendency for deform-ation of the blade is eliminated, - the amount of working hours for one blade without sharpening between the work:ing times has increased about tenfold.
In the following a preferable embodiment of the inven-tion will be described with reference to the enclosed drawings, in which:
figure 1 is disclosing an apparatus for the performing of the process of the invention, in a side view, figure 2 is disclosing the apparatus of figure 1 in section along the line II - II, and figures 3a, 3b, 4a, 4b, 5a, and 5b are disclosing segments of dif-ferent knife blades and sections therefor for performing the pro-cess of the invention.
The mineral wool web 1, which is coming from the curing oven and ~3~
.. . ..
.
subsequent cooling is moving forwards on the conveyor 4 towards ' the knife blades 2 which are cutting the unlevel edge region from the web. The height of the axles of the knife blades is arranged to barely reach the lower face of the mineral wool web. The peri- `
pherical moving direction of the knife blade is the same as the moving direction of the web. The peripherical speed of the knife blade is empirically determined on the ground of the velocity of web and of its thickness, density and stiffness. The relation between the peripherical speed of the knife blade and the linear velocity of the web will lie between 1.1 and 10, a higher rela-tion value being normally applied with thinner and softer webs.
By means of continuous-current drive and known transmission de-vices the knife blade 2 and the conveyor will obtain the linear moving velocities determined beforehand. When cutting webs of one and the same type the velocities are maintained constant.
The edge of the knife blade can be formed for example as disclos-ed in the fiugres 3-5. Normally the simplest form according to ;~
figure 3 is used which has no discontinuities in the peripherical direction of the edge, while the embodiments of the figures 4 and 5 containing in the peripherical direction inwardly half-circle formed and interrupted outwardly circular discontinuities respect-ively are used with webs having inferior cleavability. A common feature for these embodiments of the edge is naturally, as is re-vealed in the sectional views, the cleav.tng or slitting edge in stead of a chips cutting edge.
~ . , - : ` :
The technique generally used today for the said dividing or cut-ting operations in the production of mineral wool products is saw-ing with rotating toothed blades furnished with cutters of hard metal or with fast rotating abrasive wheels. This technique is, however, undesirable because of the dust being formed and which is difficult to overcome in order to get an acceptable working atmosphere. This technique is also causing a waste of material which in the long run becomes considerable.
The purpose of this invention is to develop a new process for cut-ting mineral webs where the development of dust and ma~or waste of material are eliminated.
In order to obtain this purpose cutting with rotating knives has been tried on mineral webs in the known way which is used in the textile industry. Characterizing for this technique are partly the form of the edge of the rotating knife blades, which is such that the edge is slitting or cleaving the staple of fabric layers, and partly the very high rotating speed of the knife blades. These characteristics are very suitable for products constituted of flex-ible fabric layers and the result is consequently good, which means that the trace is smooth and the development of dust insignificant and that the blade can be used for a long time without sharpening.
Using the same technique on mineral wool webs which are relatively . . . .
, :.~, . , ,, , . .:
' . ~ ' ,' , :: '' -, . :: ., :,, - : : .
- ..:. ~ :
dense and hard and have a considerable thickness between about 10 to 300 mm has not been successfu]. The development of dust and waste of material have in fact essentially decreased but the fric-tion heat grows high and causes deformation of the blade and un-sharpness after a short use thereof.
Considering these negative experiences another process has been tried, that is levelling and longitudinal and transversal cutting of a moving mineral wool web with stationary blades of the same ~-form as above. Surprisingly enough such a technique has been adapted on stiff mineral wool webs with a satisfying result. When adapting the same process on more flexible webs the tearing actions is, however, too big. The conclusion that also these flexible webs can be cut with the same knife-formed tool provided the blade is given a cutting movement, preferably a rotating movement, the velocity of which is somewhat higher than the velocity of the material web, has, however, been reached through tests. There exists no development of dust in this technique.
The new process is thus characterized in that the cutting is per-formed with a knife blade having a peripherical speed in the di-rection of the movement of the web which is somewhat higher than the velocity of the mineral wool web and in that edge of the knife blade has a form with a cleaving, not a cutt.tng effect, which latter action means that chips are formed during the cutting.
The essence of the new process is constituted of the fact that the knife blade has a smooth edge tapering towards the top of the edge and having a slitting or cleaving effect contrary to the toothed edge of a sawing blade wherein the teeth are formed to cut chips during the sawing. As mentioned above saw toothed blades have been used until now for the cutting of mineral wool webs and it is therefore quite unexpected that a smooth cleaving edge with a relatively low rotation rate is able to cut these webs and produce a clean trace without the development of dis-turbing dust.
,., ~, ' ~, .;, ' .' ~ : , :: . .
-: r - 10~0117 In a preferable embodiment of the process the knife blade has a rotating movement and further it is preferable that the peripherical rate of the knife blade is about 1.1 - 10 times the rate of the mineral wool web. This relation is empirically determined for each web and is primarily dependent on the thick-ness and the density of the web, the amount of binding agent in the web and on the degree of hardness of the web.
The velocity control of the peripherical speed of the knife blade is preferably performed synchronically with the velo-city of the wool web, for example, with a continuous-current motor.
As compared with the prior known sawing process the following advantages are obtained - the development of dust is so insignificant that the apparatus for removing of dust by suction are superfluous, - thanks to the very small friction heat the tendency for deform-ation of the blade is eliminated, - the amount of working hours for one blade without sharpening between the work:ing times has increased about tenfold.
In the following a preferable embodiment of the inven-tion will be described with reference to the enclosed drawings, in which:
figure 1 is disclosing an apparatus for the performing of the process of the invention, in a side view, figure 2 is disclosing the apparatus of figure 1 in section along the line II - II, and figures 3a, 3b, 4a, 4b, 5a, and 5b are disclosing segments of dif-ferent knife blades and sections therefor for performing the pro-cess of the invention.
The mineral wool web 1, which is coming from the curing oven and ~3~
.. . ..
.
subsequent cooling is moving forwards on the conveyor 4 towards ' the knife blades 2 which are cutting the unlevel edge region from the web. The height of the axles of the knife blades is arranged to barely reach the lower face of the mineral wool web. The peri- `
pherical moving direction of the knife blade is the same as the moving direction of the web. The peripherical speed of the knife blade is empirically determined on the ground of the velocity of web and of its thickness, density and stiffness. The relation between the peripherical speed of the knife blade and the linear velocity of the web will lie between 1.1 and 10, a higher rela-tion value being normally applied with thinner and softer webs.
By means of continuous-current drive and known transmission de-vices the knife blade 2 and the conveyor will obtain the linear moving velocities determined beforehand. When cutting webs of one and the same type the velocities are maintained constant.
The edge of the knife blade can be formed for example as disclos-ed in the fiugres 3-5. Normally the simplest form according to ;~
figure 3 is used which has no discontinuities in the peripherical direction of the edge, while the embodiments of the figures 4 and 5 containing in the peripherical direction inwardly half-circle formed and interrupted outwardly circular discontinuities respect-ively are used with webs having inferior cleavability. A common feature for these embodiments of the edge is naturally, as is re-vealed in the sectional views, the cleav.tng or slitting edge in stead of a chips cutting edge.
~ . , - : ` :
Claims (3)
1. A process for obtaining a dustfree slitting of a movable mineral wood web, comprising slitting of the web with a knife blade having a peripherical speed in the moving direction of the web that is somewhat higher than the velocity of the mineral wool web, the edge of said knife blade having a form with a cleaving, not a chips cutting effect.
2. A process as in claim 1, wherein the knife blade is rotating with a peripherical speed of about 1.1-10 times the linear velocitt of the mineral wool web.
3. A process as in claims 1 or 2 wherein the peri-pherical speed of the knife blade is regulated synchronically with the velocity of the mineral wool web.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI771942A FI56636C (en) | 1977-06-21 | 1977-06-21 | DAMMFRI SKAERNING AV EN ROERLIG MINERALULLSBANA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1080117A true CA1080117A (en) | 1980-06-24 |
Family
ID=8510923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA305,801A Expired CA1080117A (en) | 1977-06-21 | 1978-06-20 | Dustfree cutting of a mineral wool web |
Country Status (11)
| Country | Link |
|---|---|
| BE (1) | BE868338A (en) |
| CA (1) | CA1080117A (en) |
| CH (1) | CH631379A5 (en) |
| DE (1) | DE2826713C2 (en) |
| DK (1) | DK143738B (en) |
| FI (1) | FI56636C (en) |
| FR (1) | FR2395349A1 (en) |
| GB (1) | GB2000118B (en) |
| NL (1) | NL185398C (en) |
| NO (1) | NO148324C (en) |
| SE (1) | SE436990B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2542577B1 (en) * | 1983-03-14 | 1986-10-31 | Sae Esun | MACHINE FOR CUTTING LARGE FOODSTUFFS, ESPECIALLY TUNA |
| DE3423856A1 (en) * | 1984-06-28 | 1986-01-09 | Fritz 4830 Gütersloh Flötotto | Method and apparatus for cutting up a board, especially a board consisting of chipboard material |
| DE3927262A1 (en) * | 1989-08-18 | 1991-02-21 | Balke Axel | CIRCULAR OR ARCED MACHINE KNIFE |
| EP0760733B1 (en) * | 1994-02-22 | 1998-06-03 | Rockwool International A/S | Method of cutting insulation materials and blade suitable for use carrying out said method |
| SE534102C2 (en) * | 2009-07-02 | 2011-04-26 | Kapman Ab | Saw blades with sinusoidal teeth and knife and saw with such saw blades |
| CN111716438A (en) * | 2019-03-21 | 2020-09-29 | 山东万事达建筑钢品股份有限公司 | Mouth of a son step rock wool cutting equipment |
| CN115074981B (en) * | 2022-06-30 | 2023-05-30 | 绍兴金祥惠纺织印染有限公司 | Cloth miscellaneous line cutting device with dust removing function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB566335A (en) * | 1943-06-15 | 1944-12-22 | Stirling Textile Ind Ltd | Improvements in or relating to machines for cutting materials into strips |
| DE1050249B (en) * | 1955-11-28 | 1959-02-05 | Fritz Witschi, Schaffhausen (Schweiz) | Process for the continuous production of zigzag cotton packs and apparatus for carrying out the process |
| FR1287458A (en) * | 1961-01-30 | 1962-03-16 | Method and machine for cutting long width pieces of fabric into ribbons or strips | |
| US3213728A (en) * | 1962-09-06 | 1965-10-26 | Owens Corning Fiberglass Corp | Slitter for mat materials |
| DE1301047B (en) * | 1964-12-19 | 1969-08-14 | Dunlop Ag | Method and cutting machine for cutting a steel cable car |
-
1977
- 1977-06-21 FI FI771942A patent/FI56636C/en not_active IP Right Cessation
-
1978
- 1978-06-16 NO NO782110A patent/NO148324C/en unknown
- 1978-06-19 CH CH665578A patent/CH631379A5/en not_active IP Right Cessation
- 1978-06-19 NL NLAANVRAGE7806610,A patent/NL185398C/en not_active IP Right Cessation
- 1978-06-19 DE DE2826713A patent/DE2826713C2/en not_active Expired
- 1978-06-20 GB GB7827402A patent/GB2000118B/en not_active Expired
- 1978-06-20 DK DK277278AA patent/DK143738B/en not_active Application Discontinuation
- 1978-06-20 CA CA305,801A patent/CA1080117A/en not_active Expired
- 1978-06-21 FR FR7820404A patent/FR2395349A1/en active Granted
- 1978-06-21 BE BE188751A patent/BE868338A/en not_active IP Right Cessation
- 1978-06-21 SE SE7807088A patent/SE436990B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH631379A5 (en) | 1982-08-13 |
| SE7807088L (en) | 1978-12-22 |
| NL185398C (en) | 1990-04-02 |
| NO782110L (en) | 1978-12-22 |
| FR2395349A1 (en) | 1979-01-19 |
| FI56636B (en) | 1979-11-30 |
| NO148324C (en) | 1983-09-21 |
| DK143738B (en) | 1981-10-05 |
| SE436990B (en) | 1985-02-04 |
| FR2395349B1 (en) | 1983-07-08 |
| DE2826713A1 (en) | 1979-01-11 |
| DE2826713C2 (en) | 1987-01-15 |
| GB2000118A (en) | 1979-01-04 |
| BE868338A (en) | 1978-10-16 |
| NO148324B (en) | 1983-06-13 |
| NL185398B (en) | 1989-11-01 |
| GB2000118B (en) | 1982-01-20 |
| FI771942A (en) | 1978-12-22 |
| NL7806610A (en) | 1978-12-27 |
| DK277278A (en) | 1978-12-22 |
| FI56636C (en) | 1980-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |