WO1991014558A1 - Production of perforate structures - Google Patents

Production of perforate structures Download PDF

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Publication number
WO1991014558A1
WO1991014558A1 PCT/GB1991/000413 GB9100413W WO9114558A1 WO 1991014558 A1 WO1991014558 A1 WO 1991014558A1 GB 9100413 W GB9100413 W GB 9100413W WO 9114558 A1 WO9114558 A1 WO 9114558A1
Authority
WO
WIPO (PCT)
Prior art keywords
mask
radiation
resin material
source
support surface
Prior art date
Application number
PCT/GB1991/000413
Other languages
French (fr)
Inventor
Ian Christison Sayers
James Thomas Guthrie
Gordon Glenn Alexander
Anthony Morton
Original Assignee
Scapa Group Plc
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 Scapa Group Plc filed Critical Scapa Group Plc
Publication of WO1991014558A1 publication Critical patent/WO1991014558A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/10—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation for articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/0266—Local curing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/28—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on an endless belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0063—Perforated sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0045—Perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/733—Fourdrinier belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/737—Articles provided with holes, e.g. grids, sieves

Definitions

  • the invention concerns the production of perforate structures and has particular, though not exclusive, reference to flexible structures for use in the papermak- ing industry.
  • the fabric be of a predetermined and sensibly consistent permeability in order that uniformity of drainage/drying according to the particular stage of the papermaking process involved, might be achieved throughout the full areal extent of the paper sheet as it moves through the papermaking machine.
  • Conventionally papermakers fabrics include, for example, woven structures or structures defined by interdigitated helical coils to either of which structures there may be added one or more batts of textile fibres. Permeability of the fabric may be reduced by including stuffer yarns in the cross-machine direction of the fabric, be it a woven fabric or a link-belt defined by side-by-side coils, or, in the case of a link belt, by impregnating the same with a foam material or by including strips of an elongate material within some at least of the individual coils.
  • a method of producing a permeable fabric which comprises the steps of providing a layer of radiation curable polymeric resin material in fluid form, irradiating said layer of material through a mask selectively transparent to the radiation so as to effect at least partial curing of the material of the sheet in positions corresponding with transparent regions of the mask, removing uncured polymeric material and effecting any necessary full cure of the residual such material.
  • the invention also includes apparatus for use in producing the method aforesaid which comprises feed means for delivering fluid polymeric material, a support means to receive said material from the feed means, a source of radiation positioned to irradiate polymeric material present on the support means, the source of radiation being adapted to direct sensibly parallel radiation towards the support means, and a transparent mask intermediate the source of radiation and the support means and through which radiation passes to polymeric material positioned thereon, the mask being selectively transparent in accordance with opaque patterning applied thereto.
  • the support means is defined by a continuously moving band and the mask comprises an endless loop having a run arranged in spaced parallel disposition relative to the support surface and advanced at a like rate to the movement of the band.
  • the feed means comprises a curtains coater delivering • a continuous sheet of fluid polymeric material to the support surface.
  • Fig. 1 is a diagrammatic illustration of the successive steps in the method of the invention.
  • Fig. 2 is a diagrammatic view of apparatus for use in practising the invention.
  • a photopolymeric resin material 10 is applied to the surface of a moving conveyor belt 11, the viscosity of the resin being such as to form a layer 12 of uniform thickness thereon, and a selectively transparent mask 13 is brought into closely spaced relationship with respect to the upper surface of layer 12 for advancing movement therewith.
  • the band 12 includes transparent and opaque regions 14,
  • the layer ' 12 of resin material is subjected to illumination, through the mask 13, of a kind such as will effect at least a partial cure of that material in locations thereof in register with the transparent regions 14 of the mask, the illumination being in a direction normal to the surface of the mask.
  • the mask After illumination, the mask is moved away from the surface of the layer of photopolymeric material, and such material advances to be subjected to a localised jet of pressure air, as at 16, whereby uncured polymer is removed, thus creating apertures in the partially cured layer in positions corresponding to the opaque regions of the mask.
  • the apertured resin sheet is then subjected to further illumination so as fully to cure the resin, as at 17.
  • Apparatus suitable for practising the method is shown diagrammatically in Fig. 2 and will be seen to comprise a curtain coater 21 which supplies a layer 23 of a light- curable material of uniform thickness to the support surface 22 of an endless band 24, the support surface 22 having an easy release characteristic relative to the light-curable material and is typically of polytetrafluorethylene.
  • An endless mask 26 is positioned above the band 24, a lower run 27 of the mask being spaced from the support surface 22 by an amount sufficient to accommodate the material layer 23 present on the support surface 22 and to provide a small clearance between such material layer and the mask.
  • the mask 26 is driven at a like linear speed to that of the endless band 24, and the "laminate" of the lower run 27 of the mask 26, the material layer 23 and the support surface 22 of the endless band 24 move together.
  • Mask 26 is selectively transparent, in the sense that regions are provided thereon which are opaque to the radiation necessary to effect curing of the light-curable material, the regions, in the case under consideration, being circles of small diameter provided at close centres.
  • An elongated ultra violet light source 31 is provided within the loop of endless mask 26, the light source 31 further including a parabolic reflector 32 so positioned as to deliver parallel ultra voilet light to the mask in a direction perpendicular thereto.
  • the apparatus further includes pressure fluid means 33, preferably a compressed air jet, at a position downstream both of the mask 26 and the band 24, there being extractor means 34 arranged in register with the pressure fluid means 33 and at the opposite side of the layer 23 with respect thereto.
  • pressure fluid means 33 preferably a compressed air jet
  • An additional curing means 35 is included downstream of the pressure fluid means 33, the radiation supplied by said curing means being of a kind appropriate to effect curing of the photopolymeric material.
  • the apparatus is completed by a take-up roll 36 to receive fully cured apertured material.
  • the photopolymeric material used consisted of a blend of acrylated esters and/or urethanes and a photo initiator.
  • the aerylate moieties are the active centres in so far as curing is concerned and the initiator is based on acetophenone.
  • a 1 mm thick layer of the photopolymeric material was laid on the support surface and the . mask was so positioned that the lower - 6 -
  • the light source /which source was positioned 1 metre above the photopolymeric material, was such as to provide radiation of a dominant wavelength (Lambda max.) of 365 nm to give a partial core time of 30 sees.
  • the apertures in the mask were circular in form, each being 1 mm in diameter and being provided at 2 mm centres.
  • the thickness of the material layer and the geometry of the individual apertures and their disposition will be selected according to particular requirements, and that the cure, time will vary appreciably according to the intensity of the illumination and the spacing of the light source from the photopolymeric material.
  • the wavelengths of the ultra-violet light emitted by the source will extend over a range of between 250 to 400 am , although the initiator reacts to wavelengths within a narrow band of, say, 360 - 370 nm.
  • the light source will, of course, be selected having regard to the wave-lengths required to effect reaction of the initiator included in the photopolymeric material. It is to be appreciated that the method and apparatus as aforesaid will allow of the production, as a continuous process, of apertured sheet material in a simple and economic manner. The thickness of the sheet may be varied to suit particular requirements, - 7 -
  • yarns and/or fibres may be included in the mix applied to the support surface 22 of the endless band 24.
  • the facility for selective curing of the material applied to the support surface 22 of the endless band 24 which arises from the use of a mask provides for the production of apertured structures of a broad range of permeabilities and this merely by suitable selection of aperture size and spacing.
  • the method of the invention does make possible the creat- ion of a graded permeability towards the edges of the sheet merely by use of a mask of an appropriate form.
  • the form of reflector is intended to ensure that the light reaching the mask is parallel light, thereby to ensure accuracy in aperture form and size, although it is thought that, by judicious selection of the light source and reflector, apertures having cross-sectional dimensions which vary progressively in the thickness direction of the material may be possible.
  • the apertured structure as aforesaid whilst being intended primarily as a fabric for use in the papermaking and like industry, is thought to be of application in other contexts.
  • the apertured structure as aforesaid is of application as a papermakers' dryer fabric, and may be combined with a textile batt, as, for example, by applying a thin apertured structure in accordance with the invention to one or both faces of a textile batt, to form a papermakers wet felt.

Abstract

A method of producing an apertured sheet material is proposed wherein a layer (12) of photopolymeric resin material (10) is applied to a moving band (11), an apertured mask (13) which moves in synchronism with the support surface is positioned to overlie the resin material, and the resin material is irradiated through the mask (13) to effect an at least partial cure thereof in regions in register with the apertures (14) in the mask (13). After radiation of the resin material layer (12), uncured such material is removed by pressure fluid jets (16) and final curing of the resin material is effected. Apparatus for practising the method is also disclosed. The apertured sheet material is of use in producing fabrics for, inter alia, the papermaking industry.

Description

PRODUCTION OF PERFORATE STRUCTURES
The invention concerns the production of perforate structures and has particular, though not exclusive, reference to flexible structures for use in the papermak- ing industry.
It is of importance to the production of papermaking and like fabrics that the fabric be of a predetermined and sensibly consistent permeability in order that uniformity of drainage/drying according to the particular stage of the papermaking process involved, might be achieved throughout the full areal extent of the paper sheet as it moves through the papermaking machine.
Conventionally papermakers fabrics include, for example, woven structures or structures defined by interdigitated helical coils to either of which structures there may be added one or more batts of textile fibres. Permeability of the fabric may be reduced by including stuffer yarns in the cross-machine direction of the fabric, be it a woven fabric or a link-belt defined by side-by-side coils, or, in the case of a link belt, by impregnating the same with a foam material or by including strips of an elongate material within some at least of the individual coils.
Accuracy and uniformity of permeability, whilst being controllable in the prior structures, is not ideal, and it is the primary object of the present invention to provide a means whereby specific requirements of a fabric as regards its permeability might more readily be attained in a simple and economic manner. According to the present invention there is proposed a method of producing a permeable fabric which comprises the steps of providing a layer of radiation curable polymeric resin material in fluid form, irradiating said layer of material through a mask selectively transparent to the radiation so as to effect at least partial curing of the material of the sheet in positions corresponding with transparent regions of the mask, removing uncured polymeric material and effecting any necessary full cure of the residual such material.
The invention also includes apparatus for use in producing the method aforesaid which comprises feed means for delivering fluid polymeric material, a support means to receive said material from the feed means, a source of radiation positioned to irradiate polymeric material present on the support means, the source of radiation being adapted to direct sensibly parallel radiation towards the support means, and a transparent mask intermediate the source of radiation and the support means and through which radiation passes to polymeric material positioned thereon, the mask being selectively transparent in accordance with opaque patterning applied thereto. According to a preferred feature, the support means is defined by a continuously moving band and the mask comprises an endless loop having a run arranged in spaced parallel disposition relative to the support surface and advanced at a like rate to the movement of the band. 3 -
According to a further preferred feature, the feed means comprises a curtains coater delivering • a continuous sheet of fluid polymeric material to the support surface.
The invention will now be described further, by way of example only, with reference to the accompanying drawings in which : -
Fig. 1 is a diagrammatic illustration of the successive steps in the method of the invention; and
Fig. 2 is a diagrammatic view of apparatus for use in practising the invention.
Referring now to Fig. 1 of the drawings, a photopolymeric resin material 10 is applied to the surface of a moving conveyor belt 11, the viscosity of the resin being such as to form a layer 12 of uniform thickness thereon, and a selectively transparent mask 13 is brought into closely spaced relationship with respect to the upper surface of layer 12 for advancing movement therewith.
The band 12 includes transparent and opaque regions 14,
15 respectively. The layer ' 12 of resin material is subjected to illumination, through the mask 13, of a kind such as will effect at least a partial cure of that material in locations thereof in register with the transparent regions 14 of the mask, the illumination being in a direction normal to the surface of the mask.
After illumination, the mask is moved away from the surface of the layer of photopolymeric material, and such material advances to be subjected to a localised jet of pressure air, as at 16, whereby uncured polymer is removed, thus creating apertures in the partially cured layer in positions corresponding to the opaque regions of the mask. The apertured resin sheet is then subjected to further illumination so as fully to cure the resin, as at 17.
Apparatus suitable for practising the method is shown diagrammatically in Fig. 2 and will be seen to comprise a curtain coater 21 which supplies a layer 23 of a light- curable material of uniform thickness to the support surface 22 of an endless band 24, the support surface 22 having an easy release characteristic relative to the light-curable material and is typically of polytetrafluorethylene.
An endless mask 26 is positioned above the band 24, a lower run 27 of the mask being spaced from the support surface 22 by an amount sufficient to accommodate the material layer 23 present on the support surface 22 and to provide a small clearance between such material layer and the mask. The mask 26 is driven at a like linear speed to that of the endless band 24, and the "laminate" of the lower run 27 of the mask 26, the material layer 23 and the support surface 22 of the endless band 24 move together.
Mask 26 is selectively transparent, in the sense that regions are provided thereon which are opaque to the radiation necessary to effect curing of the light-curable material, the regions, in the case under consideration, being circles of small diameter provided at close centres.
An elongated ultra violet light source 31 is provided within the loop of endless mask 26, the light source 31 further including a parabolic reflector 32 so positioned as to deliver parallel ultra voilet light to the mask in a direction perpendicular thereto.
The apparatus further includes pressure fluid means 33, preferably a compressed air jet, at a position downstream both of the mask 26 and the band 24, there being extractor means 34 arranged in register with the pressure fluid means 33 and at the opposite side of the layer 23 with respect thereto.
An additional curing means 35 is included downstream of the pressure fluid means 33, the radiation supplied by said curing means being of a kind appropriate to effect curing of the photopolymeric material.
The apparatus is completed by a take-up roll 36 to receive fully cured apertured material. In one particular example the photopolymeric material used consisted of a blend of acrylated esters and/or urethanes and a photo initiator. The aerylate moieties are the active centres in so far as curing is concerned and the initiator is based on acetophenone. A 1 mm thick layer of the photopolymeric material was laid on the support surface and the . mask was so positioned that the lower - 6 -
run thereof was spaced from the surface of such material by a distance of 1 2 n . The light source, /which source was positioned 1 metre above the photopolymeric material, was such as to provide radiation of a dominant wavelength (Lambda max.) of 365 nm to give a partial core time of 30 sees. The apertures in the maskwere circular in form, each being 1 mm in diameter and being provided at 2 mm centres.
It is to be appreciated that the thickness of the material layer and the geometry of the individual apertures and their disposition, will be selected according to particular requirements, and that the cure, time will vary appreciably according to the intensity of the illumination and the spacing of the light source from the photopolymeric material.
Furthermore, it is to be understood that the wavelengths of the ultra-violet light emitted by the source will extend over a range of between 250 to 400 am , although the initiator reacts to wavelengths within a narrow band of, say, 360 - 370 nm. The light source will, of course, be selected having regard to the wave-lengths required to effect reaction of the initiator included in the photopolymeric material. It is to be appreciated that the method and apparatus as aforesaid will allow of the production, as a continuous process, of apertured sheet material in a simple and economic manner. The thickness of the sheet may be varied to suit particular requirements, - 7 -
whilst the particular formulation for the photopolymeric material will be selected having regard to the character¬ istics required in the end product.
If it is required to improve the tensile strength of the sheet material, yarns and/or fibres may be included in the mix applied to the support surface 22 of the endless band 24.
The facility for selective curing of the material applied to the support surface 22 of the endless band 24 which arises from the use of a mask provides for the production of apertured structures of a broad range of permeabilities and this merely by suitable selection of aperture size and spacing. As will be recognised the method of the invention does make possible the creat- ion of a graded permeability towards the edges of the sheet merely by use of a mask of an appropriate form.
The form of reflector is intended to ensure that the light reaching the mask is parallel light, thereby to ensure accuracy in aperture form and size, although it is thought that, by judicious selection of the light source and reflector, apertures having cross-sectional dimensions which vary progressively in the thickness direction of the material may be possible.
Whilst the invention is described in the context of irradiation by ultra voilet light, it is to be recog- nised that other energy sources may be utilised, and in this regard mention is made of such as an electron beam as a source of radiation. The apertured structure as aforesaid, whilst being intended primarily as a fabric for use in the papermaking and like industry, is thought to be of application in other contexts. The apertured structure as aforesaid is of application as a papermakers' dryer fabric, and may be combined with a textile batt, as, for example, by applying a thin apertured structure in accordance with the invention to one or both faces of a textile batt, to form a papermakers wet felt.
The invention is not limited to the specific detail of the arrangement hereinbefore set forth, and alternatives will readily present themselves to one skilled in the art. Whilst production of an apertured structure by the continuous process is hereinbefore disclosed, it is to be understood that in some circumstances it may be preferred to build up a structure in a stepwise manner by creating individual panels joined in edge-to-edge disposition to a previously formed panel, means being provided to ensure appropriate alignment between the apertures of the panel in course of creation and the apertures of the existing panel or panels and the panel in course of creation being cast to abut an edge or edges of an existing panel or panels and to fuse therewith or adhere thereto on partial or full curing.

Claims

1. A method of producing a permeable fabric comprising the steps of providing a layer of radiation curable polymeric resin material in fluid form, irradiating said layer of material through a mask selectively transparent to the radiation so as to effect at least partial curing of the material of the sheet in positions corresponding with transparent regions of the mask, removing uncured polymeric material and effecting any necessary full cure of the residual such material.
2. The method as claimed in claim 1, wherein the radiation comprises parallel light directed perpendicul¬ arly of the mask.
3. The method as claimed in claim 1 or claim 2, wherein uncured polymeric material is removed by fluid under pressure.
4. The method as claimed in any one of the preceding claims, wherein the radiation curable polymeric resin material is applied to a moving support surface and the selectively transparent mask is progressed at a linear speed corresponding to that of the support surface.
5. The method as claimed in any one of claims 1 to 3, wherein a fabric is built up in stepwise manner by creating individual panels successively in edge-to-edge abutting relationship with a previously formed panel or panels, the panel in course of creation being cast to abut an edge of an existing panel to fuse or adhere thereto on curing.
6. The method as claimed in any one of the preceding claims, wherein the mask is maintained in closely spaced disposition with respect to the resin material existing on the support surface.
7. Apparatus for the production of permeable fabrics comprising feed means for delivering fluid polymeric material, a support means to receive said material from the feed means, a source of radiation positioned to irradiate polymeric material present on the support means, the source of radiation being adapted to direct sensibly parallel radiation towards the support means, and a transparent mask intermediate the source of radiation and the support means and through which radiation passes to polymeric material positioned thereon, the mask being selectively transparent in accordance with opaque patterning applied thereto.
8. Apparatus as claimed in claim 7, wherein the support means comprises a continuously moving band and the mask comprises an endless loop having a run arranged in spaced parallel disposition relative to the support surface and advanced at a like rate to the movement of the band.
9. Apparatus as claimed in claim 7 or 8, wherein the feed means comprises a curtain coater positioned and adapted' to deliver a sheet of fluid polymeric material to the support surface.
10. Apparatus as claimed in any one of claims 7 to 9, wherein the source of radiation includes a parabolic reflector positioned to deliver parallel light to the
5 mask in a direction perpendicular thereto.
11. Apparatus as claimed in claim 5, or in claim 9 or 10 when dependant thereon, wherein the source of radiation is disposed within the endless loop forming the mask and is co-extensive with the band in the widthwise
10 direction thereof.
12. Apparatus as claimed in any one of claims 7 to 11, further including means adapted to remove uncured polymeric resin material, said means including a source of fluid under pressure adapted to apply a localised jet
15 or jets of pressure fluid to an at least partially cured polymeric resin material existing on the support means.
13. Apparatus as claimed in claim 12, further including additional curing means downstream of the means adapted to remove uncured polymeric resin material.
20 14. An apertured polymeric resin material produced in accordance with the method claimed in any one of claims 1 to 6.
PCT/GB1991/000413 1990-03-17 1991-03-18 Production of perforate structures WO1991014558A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9006077.3 1990-03-17
GB9006077A GB2241915A (en) 1990-03-17 1990-03-17 Production of perforate structures.

Publications (1)

Publication Number Publication Date
WO1991014558A1 true WO1991014558A1 (en) 1991-10-03

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Country Status (3)

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GB (1) GB2241915A (en)
WO (1) WO1991014558A1 (en)
ZA (1) ZA911987B (en)

Cited By (23)

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US5334289A (en) * 1990-06-29 1994-08-02 The Procter & Gamble Company Papermaking belt and method of making the same using differential light transmission techniques
WO1996025547A1 (en) * 1995-02-15 1996-08-22 The Procter & Gamble Company Method of applying a photosensitive resin to a substrate for use in papermaking
US5549790A (en) * 1994-06-29 1996-08-27 The Procter & Gamble Company Multi-region paper structures having a transition region interconnecting relatively thinner regions disposed at different elevations, and apparatus and process for making the same
US5556509A (en) * 1994-06-29 1996-09-17 The Procter & Gamble Company Paper structures having at least three regions including a transition region interconnecting relatively thinner regions disposed at different elevations, and apparatus and process for making the same
US5580423A (en) * 1993-12-20 1996-12-03 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5629052A (en) * 1995-02-15 1997-05-13 The Procter & Gamble Company Method of applying a curable resin to a substrate for use in papermaking
US5693187A (en) * 1996-04-30 1997-12-02 The Procter & Gamble Company High absorbance/low reflectance felts with a pattern layer
US5832362A (en) * 1997-02-13 1998-11-03 The Procter & Gamble Company Apparatus for generating parallel radiation for curing photosensitive resin
US5837103A (en) * 1994-06-29 1998-11-17 The Procter & Gamble Company Web patterning apparatus comprising a felt layer and a photosensitive resin layer
US5855739A (en) * 1993-12-20 1999-01-05 The Procter & Gamble Co. Pressed paper web and method of making the same
US5861082A (en) * 1993-12-20 1999-01-19 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5871887A (en) * 1994-06-29 1999-02-16 The Procter & Gamble Company Web patterning apparatus comprising a felt layer and a photosensitive resin layer
US5962860A (en) * 1997-05-19 1999-10-05 The Procter & Gamble Company Apparatus for generating controlled radiation for curing photosensitive resin
US6017583A (en) * 1996-01-25 2000-01-25 Conrad Munzinger & Cie Ag Process for the production of a web of material
US6287641B1 (en) 1996-08-22 2001-09-11 The Procter & Gamble Company Method for applying a resin to a substrate for use in papermaking
US6420100B1 (en) 2000-10-24 2002-07-16 The Procter & Gamble Company Process for making deflection member using three-dimensional mask
US6576090B1 (en) 2000-10-24 2003-06-10 The Procter & Gamble Company Deflection member having suspended portions and process for making same
US6576091B1 (en) 2000-10-24 2003-06-10 The Procter & Gamble Company Multi-layer deflection member and process for making same
US6660129B1 (en) 2000-10-24 2003-12-09 The Procter & Gamble Company Fibrous structure having increased surface area
US6743571B1 (en) 2000-10-24 2004-06-01 The Procter & Gamble Company Mask for differential curing and process for making same
US7166195B2 (en) 2003-07-15 2007-01-23 Albany International Corp. Grooved and perforated layer for use in papermakers' fabric
US7799411B2 (en) 2006-10-31 2010-09-21 The Procter & Gamble Company Absorbent paper product having non-embossed surface features
US7914649B2 (en) 2006-10-31 2011-03-29 The Procter & Gamble Company Papermaking belt for making multi-elevation paper structures

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US5609725A (en) * 1994-06-29 1997-03-11 The Procter & Gamble Company Multi-region paper structures having a transition region interconnecting relatively thinner regions disposed at different elevations, and apparatus and process for making the same
US5629052A (en) * 1995-02-15 1997-05-13 The Procter & Gamble Company Method of applying a curable resin to a substrate for use in papermaking
US5817377A (en) * 1995-02-15 1998-10-06 The Procter & Gamble Company Method of applying a curable resin to a substrate for use in papermaking
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US5674663A (en) * 1995-02-15 1997-10-07 Mcfarland; James Robert Method of applying a photosensitive resin to a substrate for use in papermaking
US6017583A (en) * 1996-01-25 2000-01-25 Conrad Munzinger & Cie Ag Process for the production of a web of material
US5693187A (en) * 1996-04-30 1997-12-02 The Procter & Gamble Company High absorbance/low reflectance felts with a pattern layer
US6287641B1 (en) 1996-08-22 2001-09-11 The Procter & Gamble Company Method for applying a resin to a substrate for use in papermaking
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US6576090B1 (en) 2000-10-24 2003-06-10 The Procter & Gamble Company Deflection member having suspended portions and process for making same
US6576091B1 (en) 2000-10-24 2003-06-10 The Procter & Gamble Company Multi-layer deflection member and process for making same
US6660129B1 (en) 2000-10-24 2003-12-09 The Procter & Gamble Company Fibrous structure having increased surface area
US6743571B1 (en) 2000-10-24 2004-06-01 The Procter & Gamble Company Mask for differential curing and process for making same
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US7166195B2 (en) 2003-07-15 2007-01-23 Albany International Corp. Grooved and perforated layer for use in papermakers' fabric
US7799411B2 (en) 2006-10-31 2010-09-21 The Procter & Gamble Company Absorbent paper product having non-embossed surface features
US7914649B2 (en) 2006-10-31 2011-03-29 The Procter & Gamble Company Papermaking belt for making multi-elevation paper structures
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ZA911987B (en) 1991-12-24
GB2241915A (en) 1991-09-18
GB9006077D0 (en) 1990-05-16

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