EP0656826A1 - Dispositif servant a impregner de substances thermoplastiques des bandes ou des feuilles composees de resine expansee - Google Patents

Dispositif servant a impregner de substances thermoplastiques des bandes ou des feuilles composees de resine expansee

Info

Publication number
EP0656826A1
EP0656826A1 EP93912863A EP93912863A EP0656826A1 EP 0656826 A1 EP0656826 A1 EP 0656826A1 EP 93912863 A EP93912863 A EP 93912863A EP 93912863 A EP93912863 A EP 93912863A EP 0656826 A1 EP0656826 A1 EP 0656826A1
Authority
EP
European Patent Office
Prior art keywords
foamed resin
cylinders
sheets
sheet
calendering
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.)
Ceased
Application number
EP93912863A
Other languages
German (de)
English (en)
Inventor
Alcide Mora
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0656826A1 publication Critical patent/EP0656826A1/fr
Ceased legal-status Critical Current

Links

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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B29C44/5618—Impregnating foam articles
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, 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
    • B29K2095/00—Use of bituminous materials as moulding material

Definitions

  • the present invention concerns a device for the impregnation with thermoplastic substances of bands or sheets made of elastic foamed resin having an at least partially open cellular structure. Said sheets are particularly effective for the impermeabilization of surfaces that must be weatherproof, and therefore they are mainly used in the building sector.
  • waterproof sealing materials are increasingly used, generally consisting of a supporting structure made of elastically compressible foamed resin (foamed polyurethan) , impregnated with a thermoplastic substance such as for instance bitumen or similar material.
  • foamed resin Even after having been imbued, the foamed resin maintains its elastic properties so as it can be compressed, and therefore made waterproof, before its installation.
  • an effective impermeabilization of the foamed resin sheet can be obtained during its processing by - means of an appropriate compression.
  • the initially open cells which are impregnated for example with bitumen, gradually close as they are increasingly compressed, until the element is made completely waterproof.
  • One of the most effective processes for the production of this material is the calendering process.
  • One of the solutions of the known technique provides for instance a supporting belt on the path leading from the driving rollers as far as beyond the calendering rollers.
  • This solution presents the drawback of hindering the impregnation of the resin sheet through its surface which is in direct contact with the belt, as said belt is impermeable to the bitumen.
  • Said drawback does not appear particularly serious when the foamed resin sheet introduced is made of polyurethan resin derived from polyethers, in that this material has a completely open cellular structure and, the impregnation with bitumen takes place in a uniform way even if occurring only from one side of the foamed resin sheet.
  • This type of resins however, have limited application since they are photosensitive, and therefore subject to deterioration in time.
  • Polyester-based polyurethan resins are not photosensitive, but they are scarcely suitable to be used with said device, because they have a partially open structure and then, they would be impregnated in a poorly uniform way. Another drawback of said device is due to a not perfect resting of the belt with respect to the resin sheet that during processing often moves.
  • An object of the present invention is to overcome said disadvantages, byensuring the function of guiding the foamed resin sheets, but avoiding supporting elements of the known techniques (such as for example wire net or belt) that can break when in contact with the calendering rollers or can hinder the simultaneous impregnation of the band from both surfaces.
  • a device is therefore proposed that accomplishes in a different way the guide function, simultaneously meeting the requirement of a uniform distribution of the thermoplastic substance.
  • thermoplastic substances of elastic foamed resin bands or sheets having an at least partially open cellular structure of the type comprising driving means and guiding means of said foamed resin sheets, a hopper containing the thermoplastic substance, a couple of calendering cylinders and heating means for said cylinders, characterized in that one of said cylinders has an outher surface shaped according to a metal lattice, while the other one is externally covered with a layer of an elastomeric material resistant to high temperatures, in such a way to form a grip surface cooperating with the action of said lattice shaped cylinder.
  • figure 1 is a perspective view of the device according to the invention
  • figure 2 is a section (2a) and a perspective view (2b) a the cylinder having its external surface shaped according to a metal lattice
  • figure 3 is a section (3a) and a perspective view (3b) of the other cylinder, covered with rubber; and figure 4 is a schematic view of an equipment comprising the device of figure 1.
  • Figure 1 illustrates a impregnation device according to the present invention during a calendering process, in which a sheet of foamed resin 3 is driven into an hopper 5 through cylinders 1 and 2, latter of which is actuated by a motor.
  • the foamed resin sheet 3 rests on the fixed supporting plate 4 on which it freely slides.
  • On the opposite side a further canalizing plate 6 is provided for, with the function of accompanying the sheet 3 resting on the plate 4 without hindering it from sliding.
  • the distance between the plates 4 and 6 is adjusted at the beginning of the working cycle as a function of the thickness of the treated sheet of resin, and kept constant by means of a locking mechanism provided on the canalizing plate 6.
  • the fixed plate 4 Inside the hopper 5, that is suitably fed with a thermoplastic substance from manifolds 10 and 11 on both sides of the resin sheet, the fixed plate 4 has an end edge in the vicinity of the inlet area of calendering rollers 8 and 9, which, from that moment on, must also accomplish the function of guiding the foamed resin sheet.
  • the distance separating the fixed plate 4 from the calendering rollers 8 and 9 is preferably of about 2 cm and anyway such as to allow the sheet 3 to be accompanied as near as possible to the rollers 8 and 9 without hindering the impregnation of the surface of the sheet 3 itself that rests on the plate 4.
  • the sheet 3 is preferably made of foamed resin having partially open structure, for example of the type based on polyesters, since said materials offer high levels of reliability and duration.
  • the roller 8 as shown in figure 2a, has its external surface shaped according to a lattice 12, preferably 0.5 mm thick, on the smooth external surface of the cylinder.
  • the lattice 12 has the double function of guiding the sheet 3 into the calendering cylinders 8 and 9 avoiding the danger of deformations, but also, thanks to the improved adhesion deriving from the combined action of the two calendering rollers 8 and 9, of favouring a good impregnation of the sheet itself, both for the compression to which it is submitted and for the uniformity of distribution of the thermoplastic substance on its surface.
  • the cylinder 8 is moreover heated in a known way, using for example an equipment for oil circulation, to a temperature near the melting temperature of the thermoplastic substance so as to improve the penetration of said substance into the foamed resin sheet avoiding the risk of deformations of the foam resin itself; in the case where said thermoplastic substance is bitumen, the temperature is preferably kept at approximately 150 degrees C.
  • Figure 3a on the contrary illustrates a section of the calendering cylinder 9 that is covered with a layer of elastomer material 13 capable of resisting to oils and high temperatures.
  • a rubber is preferably used having hardness of about 40 Shore.
  • the roller 9, too, is heated to the same temperature as the roller 8 and preferably, but not necessarily, using the same heating system.
  • the function of the cylinder 9 is that of offering a grip surface to the action of the reticulated roller 8, so as to conveniently compress the foamed resin sheet that slides between the two rollers.
  • FIG. 4 schematically shows a plant comprising the aforedscribed device, wherein there is provided an equipment for the production of a pressure adhesive tape and means for coupling said adhesive tape to the sheet or band of foamed resin 3 impregnated with bitumen.
  • Said equipment essentially comprises a device 14 to spread one side of the supporting tape 15 with a generally aqueous solution of an adhesive; an element 16 for thermal treatment (e.g., evaporation of the water content) of the tape 15 provided with adhesive and two or more coupling rollers 18.
  • the tape 15 unwinds from the bobbin 17 and passes through the spreading device 14 that applies a layer of generally aqueous solution of adhesive on one side of the tape 15.
  • Said side is preferably the upper one and, in any case, presents a siliconated surface on which the adhesive is deposited but to which it only partially adheres.
  • the tape spread with adhesive then passes through an oven 16 for thermal treatment of the adhesive (for example water evaporation and/or resinification of the adhesive) and reaches the couple of cylinders 18 through which it is coupled with the sheet or band of foamed resin 3 coming, thanks to the guide of idle rollers 19, from the calendering cylinders 8 and 9.
  • the sheet 3 coupled with the adhesive tape 15 at an outlet of the rollers 18 will then be cut and shaped according to final requirements; at the moment of use the tape 15 is taken away leaving the adhesive fixed on one side of the sheet 3 for an easier application.
  • the equipment for treating the paper tape 15, comprising the spreading device 14, the oven 16, is at least partly below the calendering unit 8, 9.
  • the external surface of the calendering cylinder 8 can present, instead of a metal lattice, some indentations that provide in a different way the corrugated surface, with improved adhesion, necessary for the combined action between the two calendering rollers 8 and 9 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

Dispositif permettant d'imprégner de substances thermoplastiques des feuilles de résine expansée élastique. En particulier, une fois que les feuilles sont imprégnées de bitume et comprimées de façon appropriée, leur structure moléculaire particulière permet au bitume de continuer à assurer une bonne imperméabilisation. Pour ces raisons, ces feuilles peuvent être avantageusement utilisées dnas le domaine de la construction. En particulier, le dispositif comprend des éléments d'entraînement et de guidage de la feuille de résine expansée, une trémie alimentée en bitume, et deux rouleaux de laminage. Les rouleaux de calandrage sont chauffés et présentent, respectivement, une surface externe en forme de treillis, et une surface externe recouverte d'un matériau élastomère résistant à des températures élevées.
EP93912863A 1992-06-12 1993-06-03 Dispositif servant a impregner de substances thermoplastiques des bandes ou des feuilles composees de resine expansee Ceased EP0656826A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI921451A IT1258983B (it) 1992-06-12 1992-06-12 Dispositivo per l'impregnazione con sostanze termoplastiche di nastri o fogli di resina espansa
ITMI921451 1992-06-12
PCT/EP1993/001391 WO1993025380A1 (fr) 1992-06-12 1993-06-03 Dispositif servant a impregner de substances thermoplastiques des bandes ou des feuilles composees de resine expansee

Publications (1)

Publication Number Publication Date
EP0656826A1 true EP0656826A1 (fr) 1995-06-14

Family

ID=11363503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93912863A Ceased EP0656826A1 (fr) 1992-06-12 1993-06-03 Dispositif servant a impregner de substances thermoplastiques des bandes ou des feuilles composees de resine expansee

Country Status (3)

Country Link
EP (1) EP0656826A1 (fr)
IT (1) IT1258983B (fr)
WO (1) WO1993025380A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU705583B1 (en) * 1998-04-09 1999-05-27 Peter Hamilton Boyle Impregnated foam materials
AU2018227468B2 (en) * 2017-02-28 2023-05-18 Cidra Corporate Services Llc Processes for coating reticulated foams
CN110103383B (zh) * 2019-04-24 2020-07-07 海南中橡科技有限公司 天然橡胶智能化加工装置及其方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE687507A (fr) * 1966-09-28 1967-03-01
HU177838B (en) * 1979-01-24 1981-12-28 Chem Epitoeanyagipari Bitumen composition for impregnation and impregnating process
GB2096923A (en) * 1981-02-18 1982-10-27 British Vita Co Ltd Impregnation of cellular sheet material
IT1140336B (it) * 1981-12-15 1986-09-24 Asbiton Italiana Procedimento ed apparecchiatura per l'impregnazione di una resina espansa con sostanze termoplastiche
US5093158A (en) * 1988-11-28 1992-03-03 Allied-Signal Inc. Method to make fiber/polymer composite with nonuniformly distributed polymer matrix
DE4008046C2 (de) * 1990-03-14 1999-09-16 Irbit Research & Consulting Ag Verfahren zur Herstellung eines Formteils aus Melaminharzschaumstoff

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9325380A1 *

Also Published As

Publication number Publication date
WO1993025380A1 (fr) 1993-12-23
IT1258983B (it) 1996-03-11
ITMI921451A0 (it) 1992-06-12
ITMI921451A1 (it) 1993-12-12

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