GB1599265A - Method of texturising untextured dry tissue paper - Google Patents
Method of texturising untextured dry tissue paper Download PDFInfo
- Publication number
- GB1599265A GB1599265A GB17610/78A GB1761078A GB1599265A GB 1599265 A GB1599265 A GB 1599265A GB 17610/78 A GB17610/78 A GB 17610/78A GB 1761078 A GB1761078 A GB 1761078A GB 1599265 A GB1599265 A GB 1599265A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tissue
- texturising
- bulk
- untextured
- dry
- 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
- 238000000034 method Methods 0.000 title claims description 26
- 238000001035 drying Methods 0.000 claims description 15
- 230000000295 complement effect Effects 0.000 claims description 5
- 238000010420 art technique Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
Landscapes
- Paper (AREA)
- Sanitary Thin Papers (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
Description
(54) METHOD OF TEXTURISING UNTEXTURED DRY TISSUE PAPER (71) We, BELOIT CORPORATION, a corporation organised and existing under the laws of the State of Wisconsin, United States of America, of Beloit, Wisconsin 53511, United
States of America, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a method of texturising untextured dry tissue paper, and in particular is directed to producing bulk and softness in the tissue web sheet.
Heretofore texturising of tissue paper has generally been effected in connection with a
Yankee dryer which is a large and costly high pressure steam vessel in the form of a drum on the periphery of which the web is dried. Bulk and softness in the tissue sheet is produced by creping, that is scraping the slightly adhered sheet from the Yankee roll surface by means of a doctor blade. Inasmuch as the adhesion of the tissue sheet to the Yankee drum surface is intimately associated with the drying process, the drying and creping are inseparable functions on the Yankee dryer drum.
Alternatively, some bulkiness may be produced in the tissue sheet by passing heated air through the tissue sheet, this process being referred to as through-drying which is very satisfactory for drying the tissue in lieu of mechanical pressing. Such through-drying, as well as other tissue drying methods, suffers from the limitation that there is no built in generation of bulk or softness equivalent to the process of creping from the Yankee dryer.
As an order of magnitude estimate, a through-dryer tissue sheet may have only 1/3 to 1/2 the bulk of a tissue sheet creped from a Yankee dryer.
An important object of the present invention is to attain good bulk and softness generation in tissue sheet, avoiding the need for and great cost of a Yankee dryer and permitting drying of the sheet to be effected by a method alternative to Yankee dryer, such as through-drying.
According to the invention there is provided a method of texturising untextured dry tissue paper to effect bulk and softness therein, comprising advancing the untextured dry tissue paper through a mechanical texturising device including two grooved texturising rolls having complementary interdigitated texturising ribs and having a spacing at the nip in the range of 0.20 mm to 0.40 mm as measured from the crest of a rib on one roll to the bottom of the groove between the adjacent ribs on the other roll, the tissue paper being advanced through the nip of the rolls whilst the ribs are driven in texturising engagement with both faces of the tissue paper, thereby generating bulk and softness in the tissue paper.
The following is a more detailed description of one embodiment of the invention, reference being made to the accompanying drawings in which:
Figure I is a schematic illustration demonstrating practice of the invention in association with a tissue web former and dryer,
Figure 2 is a schematic illustration demonstrating practice of the invention on dry untextured web unwound from reels or logs as, for example, in a converting room,
Figure 3 is a schematic illustration of complementary substantially interdigitated texturising ribs and grooves of rotary texturising rolls,
Figure 4 is a diagram showing bulk attainable by various roll separations, and
Figure 5 is a diagram showing test results attained by the number of passes of a tissue web through the texturising rolls.
Referring to Figure 1: a tissue sheet web W is produced by delivering tissue stock from a headbox 10 to a former 11 comprising a foraminous forming belt 12, such as a Fourdrinier wire, which travels over or past a dewatering device such-as a suction box 13 and then delivers the formed wet web to a through-dryer 14. This dryer desirably comprises a porous dryer belt 15 which picks the formed wet web from the former belt 12 and carries the wet web in drying relation about a substantial extent of the perimeter of a porous drying roll or drum 17 from which heated drying air is driven through the belt 14 and the web as shown by the arrows 17a.Beyond the dryer 14 the dry untextured tissue web W leaves the belt 15 and may be either reeled into logs for future converting, or, as shown in Figure 1, may pass through a slitter 18 which divides the relatively wide web as formed into the desired narrower widths before the web sections are further processed e.g. ultimately reeled into rolls such as toilet tissue rolls.
In order to provide the untextured dry tissue web W with desirable bulk and softness, it is advanced through a mechanical texturising device 19 comprising in a simple and efficient form grooved rotary texturising rolls of which there may be one or more sets to provide one or more texturising passes of the web through the nips of the rolls. The texturising rolls 19 have complementary substantially interdigitated texturising ribs 20 (see Figure 3) and grooves 21 for driving in texturising relation against both faces of the dry tissue web as it advances through the nip of the rolls, whereby to generate bulk and softness in the resulting tissue sheet. The ribs and grooves 20 and 21 may extend circumferentially or longitudinally relative to the axis of the rolls 19, or in a combination of circumferential and longitudinal orientations.In a preferred form, the ribs and grooves 20, 21 may be of generally screw thread form and of substantially triangular cross section, formed as a right hand thread on one of the rolls 19 and as a left hand thread on the companion roll 19 in the set so that with the rolls rotating in unison the ribs 20 will uniformly substantially interdigitate at the nip of the rolls.
For texturising treatment of untextured dry tissue sheet web of about .115 mm calipered average thickness, the number of ribs and grooves 20, 21 may range between 10 and 28 per cm (25 to 70 per inch). By experimenting, it has been determined that to attain the best results in producing sufficient deformation of the dry tissue sheet passing through the nip of the rolls to produce the desired bulk and softness, at least a .5 mm (.020 inch) rib height and groove depth as measured from the bottom of an adjacent groove should be present. In addition, the degree or depth of engagement between the nips of the grooved rolls 19 has been found to result in a fairly predictable resulting bulkiness and softness in the resulting texture in the sheet web. For example, having reference to Figure 4, maximum bulk (cm3/gm) is attained where the spacing between the ribs 20 is minimum.For example where the caliper thickness of untextured dry tissue web is about .115 mm the greatest bulkiness is attained where the distance between the crest of a rib on one roll at the nip of the rolls and the bottom of the adjacent groove in the other roll is about .20 mm, and the bulkiness declines relatively sharply, as indicated by the descending curve in Figure 4, as this distance is increased, for example by .05 mm increments. It will be understood, of course, that the tear strength of the ultimately textured sheet will be substantially proportionate to the severity of texturising treatment to which the dry web is subjected as a result of spacing of the roll nip.Excellent results for toilet tissue are attained where the other parameters for the ribs and grooves are substantially as already described and said distance at the roll nip is about .275 mm, and wherein the attained texturised bulk is substantially as indicated at point 22 on the curve in Figure 4, namely about 8.5 cm3/gm in one pass through the rolls 19.
Where greater bulk is desired, the dry tissue web may be advanced through a plurality of texturising roll passes, two such passes being shown in Figure 1 and a third indicated as optional if even greater bulk is desired. By way of example reference is made to Figure 5 showing that the bulk rate attained is according to a straight line ascending curve as the web progresses through each successive pass, and assuming the texturising rolls to be substantially the same for each pass. Thus, where a bulk of about 8.5 cm3/gm may be expected in one pass, the bulk rate becomes about 9.5 cm3/gm in a second pass having substantially the same texturising roll nip parameters. By advancing the web through a plurality of such texturising passes, loss in tear strength is minimised.
Where it is preferred to effect texturising in the converting room of a plant rather than as a continuous process following the slitter after the dryer of a papermaking machine installation, the arrangement demonstrated in Figure 2 may be employed. In this mode, the untextured dry tissue web is reeled into rolls or logs 23, one of which is depicted and from which the web W' is advanced through one or more sets of texturising rolls 19' having characteristics such as described for the texturising rolls 19. Beyond the texturising rolls the textured web is advanced to other converting operations such as rolling into tissue rolls and wrapping.
By way of illustrating comparatively the results attained by texturising of untextured dry tissue web in accordance with the present invention with average textured tissue produced according to prior art technique such as Yankee dryer creping, reference may be had to the following chart:
Basis Thickness Bulk Breaking Softness
Weight (Caliper) cm3/gm Length, m Rating gm/m2 mm
Average
properties
of prior
art tissue 22.2 .20 9 400 1 to 9
harsh
to soft
Untextured
dry tissue 20 .115 5.75 1957
Ribbed and
Grooved
roll
treated dry
tissue 20 .17 8.5 377 4
As will be observed in this chart, when starting with an untextured dry tissue web which may have been produced by through-drying and having a basis weight of about 20 gm/m2 as compared to prior art (e.g.Yankee dryer creped) tissue, the dry tissue web after treatment according to the present invention remains at substantially a basis weight of 20 gm/m2.
Where the calipered thickness of the untextured dry tissue web is about .115 mm, after treatment it calipers at about .17 mm in comparison to about a .20 mm thickness for the prior art tissue. However, where the prior art tissue has a bulk of 9 cm3/gm, the dry tissue web textured according to the present invention has a closely similar bulk of 8.5 cm3/gm.
Also the comparative breaking length is closely approached in the textured dry tissue web according to the invention as compared to the prior art tissue in that, as shown, the breaking length of the textured dry tissue web according to the present invention is reduced to only 377 m from 1957 m and which compares quite favourably with the 400 m breaking lengths of the prior art tissue. Finally, in the softness rating wherein the prior art tissue may rate from 1 to 9, that is from harsh to very soft, a softness rating of about 4 is attained by practice of the present invention.
It will thus be apparent that according to the present invention it is possible to start with a very low bulk dry sheet of tissue and produce a final bulk comparable to tissue produced by prior art techniques such as Yankee dryer and creping. Quite substantial economies in original equipment and production are attained by the present invention by the ability to transform untextured dry tissue web produced by the most economical method such as by through-drying and without any need for the costly Yankee dryer or creeping technique.
The textured tissue sheet has nevertheless, comparable bulk, tear strength and softness to the more costly prior art tissue.
WHAT WE CLAIM IS:
1. A method of texturising untextured dry tissue paper to effect bulk and softness therein. comprising advancing the untextured dry tissue paper through a mechanical texturising device including two grooved texturising rolls having complementary interdigitated texturising ribs and having a spacing at the nip in the range of 0.20 mm to 0.40 mm as measured from the crest of a rib on one roll to the bottom of the groove between the adjacent ribs on the other roll, the tissue paper being advanced through the nip of the rolls whilst the ribs are driven in texturising engagement with both faces of the tissue paper, thereby generating bulk and softness in the tissue paper.
2. A method according to claim 1, comprising advancing the dry tissue sheet web through a plurality of mechanical texturising devices, and thereby increasing the bulk and softness in the resulting tissue sheet.
3. A method according to claim 1 or 2, wherein the rolls are provided with texturising ribs at least .5 mm in height as measured from the bottom of the intervening grooves.
4. A method according to any one of claims 1 to 3, comprising forming the untextured dry tissue web to a caliper thickness of substantially .115 mm, and effecting the texturising to attain a bulk of substantially 8.5 cm3/gm.
5. A method according to any one of claims 1 to 3, comprising forming the untextured dry tissue web to a basis weight of substantially 20 gm/m2 with a caliper thickness of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A method of texturising untextured dry tissue paper to effect bulk and softness therein. comprising advancing the untextured dry tissue paper through a mechanical texturising device including two grooved texturising rolls having complementary interdigitated texturising ribs and having a spacing at the nip in the range of 0.20 mm to 0.40 mm as measured from the crest of a rib on one roll to the bottom of the groove between the adjacent ribs on the other roll, the tissue paper being advanced through the nip of the rolls whilst the ribs are driven in texturising engagement with both faces of the tissue paper, thereby generating bulk and softness in the tissue paper.
2. A method according to claim 1, comprising advancing the dry tissue sheet web through a plurality of mechanical texturising devices, and thereby increasing the bulk and softness in the resulting tissue sheet.
3. A method according to claim 1 or 2, wherein the rolls are provided with texturising ribs at least .5 mm in height as measured from the bottom of the intervening grooves.
4. A method according to any one of claims 1 to 3, comprising forming the untextured dry tissue web to a caliper thickness of substantially .115 mm, and effecting the texturising to attain a bulk of substantially 8.5 cm3/gm.
5. A method according to any one of claims 1 to 3, comprising forming the untextured dry tissue web to a basis weight of substantially 20 gm/m2 with a caliper thickness of
substantially .115 mm, and texturising the dry tissue web to a caliper thickness of substantially .17 mm, a bulk of substantially 8.5 cm3/gm and a breaking length of substantially 377 m with a softness rating of substantially 4.
6. A method according to any one of claims 1 to 3, wherein the untextured dry tissue web is of a basis weight of substantially 20 gm/m2 and a caliper thickness of substantially .115 mm, and texturising the dry tissue web to a bulk within a range of substantially 6 cm3/gm to substantially 10,5 cm3/gm.
7. A method according to any one of claims 1 to 6, wherein the ribs extend longitudinally relative to the axes of the rolls.
8. A method according to any one of claims 1 to 6, wherein the ribs extend circumferentially on the rolls.
9. A method of texturising untextured dry tissue paper substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80073777A | 1977-05-26 | 1977-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1599265A true GB1599265A (en) | 1981-09-30 |
Family
ID=25179226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17610/78A Expired GB1599265A (en) | 1977-05-26 | 1978-05-04 | Method of texturising untextured dry tissue paper |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS542412A (en) |
| CA (1) | CA1094853A (en) |
| ES (1) | ES470160A1 (en) |
| GB (1) | GB1599265A (en) |
| IT (1) | IT1095643B (en) |
| MX (1) | MX146579A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839558A (en) * | 2012-05-08 | 2012-12-26 | 金红叶纸业集团有限公司 | Papermaking equipment, papermaking method and living paper |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS552111Y2 (en) * | 1978-02-24 | 1980-01-21 | ||
| JPS5745784A (en) * | 1980-08-30 | 1982-03-15 | Sony Corp | Noise suppressing circuit |
-
1978
- 1978-04-10 CA CA300,813A patent/CA1094853A/en not_active Expired
- 1978-05-04 GB GB17610/78A patent/GB1599265A/en not_active Expired
- 1978-05-12 MX MX173466A patent/MX146579A/en unknown
- 1978-05-24 ES ES470160A patent/ES470160A1/en not_active Expired
- 1978-05-24 IT IT23731/78A patent/IT1095643B/en active
- 1978-05-26 JP JP6236978A patent/JPS542412A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839558A (en) * | 2012-05-08 | 2012-12-26 | 金红叶纸业集团有限公司 | Papermaking equipment, papermaking method and living paper |
| CN102839558B (en) * | 2012-05-08 | 2014-11-05 | 金红叶纸业集团有限公司 | Papermaking equipment, papermaking method and living paper |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1095643B (en) | 1985-08-10 |
| CA1094853A (en) | 1981-02-03 |
| ES470160A1 (en) | 1979-02-01 |
| IT7823731A0 (en) | 1978-05-24 |
| JPS542412A (en) | 1979-01-10 |
| MX146579A (en) | 1982-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19980503 |