GB2293836A - A method of producing a flexible hollow body fillable with a fluid - Google Patents

A method of producing a flexible hollow body fillable with a fluid Download PDF

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Publication number
GB2293836A
GB2293836A GB9515229A GB9515229A GB2293836A GB 2293836 A GB2293836 A GB 2293836A GB 9515229 A GB9515229 A GB 9515229A GB 9515229 A GB9515229 A GB 9515229A GB 2293836 A GB2293836 A GB 2293836A
Authority
GB
United Kingdom
Prior art keywords
fabric
coated
layered
hollow body
cross
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.)
Withdrawn
Application number
GB9515229A
Other versions
GB9515229D0 (en
Inventor
Karl-Heinz Blomeyer
Gabriele Lindenthal
Peter Bartholmei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental AG
Original Assignee
Continental AG
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 Continental AG filed Critical Continental AG
Publication of GB9515229D0 publication Critical patent/GB9515229D0/en
Publication of GB2293836A publication Critical patent/GB2293836A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/56—Tensioning reinforcements before or during shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0809—Fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B29K2995/0069—Permeability to liquids; Adsorption non-permeable
    • 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
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating

Abstract

Flexible hollow bodies which can be filled with fluid and pressurised are made from a woven double fabric where upper and lower fabric layers are connected by woven cross-members (14). The outer sides of the double fabric are coated with an elastomer while in a collapsed state. The fabric is then extended to the desired height (b') which is greater than the woven cross-member (14) so that adjacent sections (16, 17) of the outer layers are turned inwards. The double fabric is cross-linked or welded in its tensioned state and adjacent fabric sections (16, 17) are joined to each other. Sealing edges are then attached to the free ends by adhesives or welding. Pref. the fabric is extended by spring-loaded rails so that the height (b') is increased from the maximum value possible by weaving (14) by reducing the distance (a') between cross-members. The boundaries (18) between the drawn-in sections (16) disappear after heat bonding. The fabric can be covered by an additional outer layer (21) either before or after heat bonding the double fabric in its extended state.

Description

Description
A METHOD OF PRODUCING A FLEXIBLE HOLLOW BODY WHICH CAN BE FILLED WITH A FLUID 2293836 The invention relates to a method of producing a flexible hollow body, which can be filled with a fluid or can be pressure-loaded, from a two- layered fabric which has a lower fabric layer and an upper fabric layer as well as woven webs, which join said layers.
DE 21 48 401 B2 discloses a flexible hollow body, which can be filled with a flowable medium and is formed from fabrics, which are coated with rubber or similar materials and have an upper layer and a lower layer. The mutual spacing between the upper fabric layer and the lower fabric layer, which is set by inflation pressure, is defined by so-called pile threads, which are fastened to the fabric of the upper layer and to the fabric of the lower layer and are disposed substantially vertically relative to the planes of the layers and with a lateral spacing therebetween. This two-layered fabric, thus constructed, is ordered ready for use and is only then additionally coated with the rubber or a similar material, so that a finished hollow body is produced once the edge regions have been sealed in conventional manner.
The connecting pile threads of the two-layered fabric define the maximum pressure loading of the finished hollow body. If one pile thread tears, there is a danger that the neighbouring threads will also tear in succession as a result of the overloading. Furthermore, the repeated inflation of the hollow body results in the individual pile threads scraping against the plane fabric layers, whereby the risk of tearing is increased for the pile threads.
In order to increase the pressure loading of the hollow body produced with a two-layered fabric, it has already been proposed to replace the vertically extending pile threads by woven webs, which are bonded with their ends in the upper fabric layer and the lower fabric' layer of the two-layered fabric. These woven webs are also disposed at spacings from one another. It is apparent that- a woven web can absorb a higher tensile force than an individual pile thread.
The limited length of the woven webs up to a maximum of approx. 3 cm, which is possible because of current manufacturing technology in the pertinent industry, is considered to be a disadvantage of this arrangement with woven webs. Current weaving looms cannot bind longer woven webs into a two-layered fabric.
However, a lifting movement of 10 cm becomes necessary for inflatable pads. This means that two-layered fabrics having webs bonded therein could not be used hitherto for the inflatable pad type of product, although the requirement for a high degree of pressure loading is in fact significant for i that it is possible to raise heavy the like in a safe and simple manner.
nflatable pads, so goods, vehicles or DE 29 47 406 Al discloses a flexible layered body, which is produced from a two-layered fabric coated on both sides with rubber or plastics material and is especially provided for use as a heat exchanger element. In order to seal the marginal edg6s of the two-layered fabric in a reliable, labour-saving, long-term durable manner, thereby largely avoiding manual work, the coatings protrude beyond the two-layered fabric at at least two oppositely situated marginal edges on both sides and are interconnected in a highly adhesive manner with mutual surface-to-surface contact.
The basic object of the invention is to provide method of producing a fillable hollow body formed from two-layered fabric, whereby woven webs can be inserted between the upper and lower fabric layers, and yet such method renders possible an adequate lifting movement, i.e. a greater lifting movement than is attainable at present.
According to the present invention there is provided a method of producing a flexible hollow body, which can be filled with a fluid or can be pressureloaded, from a two-layered fabric, which has a lower fabric layer and an upper fabric layer as well as woven webs, which join said layers, having the following steps:
a) the external faces of the two-layered fabric, which has been laid f lat, are coated with an elastomeric material or another flexible polymeric material; b) the coated two-layered fabric is stretched to a desired height, which is higher than the woven web, whereby adjacent portions of the upper fabric layer and the lower fabric layer are vertically deflected upwardly or downwardly; c) the coated two-layered fabric is crosslinked or welded in this stretched form, whereby the coated faces of the adjacent fabric portions are interconnected; and d) the coated two-layered fabric is sealed at its free sides with edge portions which are secured by adhesive or welded.
After the two-layered fabric has been coated with an elastomeric material or with a flexible, thermoplastic material, the two-layered fabric is stretched in such a manner that it has the desired height of the subsequent, heat-treated, e.g. vulcanised, hollow body. In such case, portions of the upper and lower fabric layers are vertically deflected upwardly or downwardly and tensioned in the direction of the fabric webs. In consequence, two vertical portions of the upper or lower fabric layer lie adjacent each other. Their coated faces abut one another. The coated two-layered fabric is heat-treated, e.g. thoroughly heated, i. e. vulcanised, in this shaped state. The coatings of the raised portions of the upper or lower fabric layer are thereby joined or welded together, so that two plane upper and lower faces of the hollow body - 6 are produced again.
As a result of this method, the height of the hollow body, which is limited per se because of the height of the woven webs, is increased beyond the possible height based on present weaving technology. Because of this procedure, the vertical spacing is optionally selectable independently of the weaving technology currently available.
hollow height The invention provides a fillable or inflatable body, more especially an inflatable pad, the of which is obtained from the upper and lower fabric layers, which are plane per se. The hollow body can withstand higher pressures than the known two layered fabric having the pile threads. Individual pressures of up to 30 bar are possible, and higher pressures are conceivable.
one embodiment of the invention is explained more fully hereinafter with reference to the drawing. In the drawing:
Fig. 1 is a schematic view of a two-layered fabric, the upper and lower layers of which are kept - 7 spaced apart by bonded, woven webs; Fig. 2 is a schematic side elevational view of the two-layered fabric; Fig. 3 illustrates the two-layered fabric of Fig. 2 in its collapsed position prior to its being coated with an elastomeric material; and Fig. 4 illustrates the stretched, coated two-layered fabric prior to the thorough heating process.
Fig. 1 illustrates a commercia.lly available two-layered fabric 11,, which has an upper fabric layer 12 and a lower fabric layer 13, which is disposed at a spacing therefrom.
The upper fabric layer 12 and the lower fabric layer 13 are interconnected with a spacing b therebetween (Fig. 2) via bonded, woven webs 14. The woven webs 14 lie at a spacing a from one another.
The upper fabric layer 12 and the lower fabric layer 13 are usually coated in a calender or a coating machine. The two fabric layers 12 and 13 are thereby laid one upon the other, whereby the webs 14, as illustrated in Fig. 3, are laid flat sideways.
- After being coated with an elastomeric material 15, the two-layered fabric 11 is stretched as shown in Fig. 4. Each rectangle of fabric, which comprises the sides a and b (Fig. 2), is thereby changed so that the height b of the rectangle is increased and the horizontal side a is reduced. A smaller horizontal length a' is thereby produced between two woven webs 14, two portions 16 and 17 of the coated upper fabric layer 12 or lower fabric layer 13 extending further vertically in alignment with said webs and thereby increasing the original height b to the new height bl.
It is schematically shown that this stretching may be effected over rectangular, spring-loaded bars 19, f or example. The coated two-layered fabric 11 is thoroughly heated or welded in this stretched position.
The elastomeric coated faces of the adjacent fabric portions 16 and of the adjacent fabric portions 17 are thereby interconnected. The boundary lines 18 between the elastomeric coatings 15 disappear as a result of the thorough heating process and are subsequently no longer detectable.
If a cover fabric 21 is laid on the surface prior to the heat treatment, this fabric is connected to the elastomeric coating and protects such against harmful effects when the finished hollow body is used.
Lateral edges are subsequently secured by adhesive or vulcanised in a manner known per se to seal the coated two-layered fabric 11 so as to form a hollow body.
If the finished hollow body is put under pressure, the webs 14 and the portions 16 and 17 of the fabric layers 12 and 13, which portions are welded together via the coating 15, are vertically aligned, so that the hollow body, representing an inflatable pad, for example, can assume a height bl which lies clearly above the height b of the woven webs 14. This height bl was obtained from the fabric layers 12 and 13, which extend horizontally relative to the woven webs 14.

Claims (4)

  1. A method of producing a flexible hollow body, which can be filled with a fluid or can be pressureloaded, from a two-layered fabric, which has a lower fabric layer and an upper fabric layer as well as woven webs, which join said layers, having the following steps:
    a) the external faces of the two-layered fabric, which has been laid flat, are coated with an elastomeric material or another flexible polymeric material; b) the coated two-layered fabric is stretched to a desired height, which is higher than the woven web, whereby adjacent portions of the upper fabric layer and the lower fabric layer are vertically deflected upwardly or downwardly; c) the coated two-layered fabric is crosslinked or welded in this stretched form, whereby the coated faces of the adjacent fabric portions are interconnected; and d) the coated two-layered fabric is sealed at 11 - its free sides with edge portions which are secured by adhesive or welded.
  2. 2. A method as claimed in claim 1, wherein an additional cover fabric is laid on the upper and/or lower face of the stretched, coated two-layered fabric prior to the cross-linking or welding process, and said cover fabric is connected to the respective coated face during the crosslinking or welding process.
  3. 3. A method as claimed in claim 1, wherein a cover fabric is subsequently secured by adhesive on the upper and/or lower face of the cross-linked or welded, shaped, coated two-layered fabric.
  4. 4. A method of producing a flexible hollow body, as claimed in claim 1,2 or 3, substantially as hereinbefore described and illustrated.
GB9515229A 1994-07-29 1995-07-25 A method of producing a flexible hollow body fillable with a fluid Withdrawn GB2293836A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4426949A DE4426949C1 (en) 1994-07-29 1994-07-29 Containers of flexible fabric esp. for pressurised lifting bags

Publications (2)

Publication Number Publication Date
GB9515229D0 GB9515229D0 (en) 1995-09-20
GB2293836A true GB2293836A (en) 1996-04-10

Family

ID=6524475

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9515229A Withdrawn GB2293836A (en) 1994-07-29 1995-07-25 A method of producing a flexible hollow body fillable with a fluid

Country Status (2)

Country Link
DE (1) DE4426949C1 (en)
GB (1) GB2293836A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008104174A2 (en) * 2007-02-27 2008-09-04 Vestas Wind Systems A/S A strengthening structure for a wind turbine blade, a wind turbine blade, a method for assembling a wind turbine blade and use hereof.
CN104647825A (en) * 2015-03-10 2015-05-27 苏州道众机械制造有限公司 Double-layered composite pipe plate

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19841906A1 (en) * 1998-09-11 2000-03-16 Contitech Elastomer Besch Gmbh Combined pressing and vulcanization of seams on flat rubber products or elastomer coated fabrics by clamping between tubular frames
DE102004051672A1 (en) * 2004-10-22 2006-04-27 Bayerische Motoren Werke Ag Aerodynamic fairing for a motor vehicle
CN116985434B (en) * 2023-09-26 2024-01-02 南京玻璃纤维研究设计院有限公司 Height control device and method for hollow fabric composite material

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2148401B2 (en) * 1971-09-28 1980-03-27 Metzeler Kautschuk Ag, 8000 Muenchen Flexible hollow body that can be filled with a flowable medium
DE2947406A1 (en) * 1979-11-24 1981-06-11 Continental Gummi-Werke Ag, 3000 Hannover Flexible rubber or plastics coated laminated body - has coating layers protruding and joined each side of textile webs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008104174A2 (en) * 2007-02-27 2008-09-04 Vestas Wind Systems A/S A strengthening structure for a wind turbine blade, a wind turbine blade, a method for assembling a wind turbine blade and use hereof.
WO2008104174A3 (en) * 2007-02-27 2008-10-16 Vestas Wind Sys As A strengthening structure for a wind turbine blade, a wind turbine blade, a method for assembling a wind turbine blade and use hereof.
US7980826B2 (en) 2007-02-27 2011-07-19 Vestas Wind Systems A/S Strengthening structure for a wind turbine blade, a wind turbine blade, a method for assembling a wind turbine blade and use hereof
CN104647825A (en) * 2015-03-10 2015-05-27 苏州道众机械制造有限公司 Double-layered composite pipe plate

Also Published As

Publication number Publication date
GB9515229D0 (en) 1995-09-20
DE4426949C1 (en) 1995-10-12

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)