EP3487692A1 - Procede d'encapsulation de vitrages automobiles - Google Patents
Procede d'encapsulation de vitrages automobilesInfo
- Publication number
- EP3487692A1 EP3487692A1 EP17754397.2A EP17754397A EP3487692A1 EP 3487692 A1 EP3487692 A1 EP 3487692A1 EP 17754397 A EP17754397 A EP 17754397A EP 3487692 A1 EP3487692 A1 EP 3487692A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- primer layer
- seconds
- temperature
- mold
- encapsulation
- 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- Withdrawn
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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/76—Moulding on edges or extremities of the preformed part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14434—Coating brittle material, e.g. glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/20—Sealing arrangements characterised by the shape
-
- 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
- B29K2021/006—Thermosetting elastomers
-
- 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
- B29K2715/00—Condition, form or state of preformed parts, e.g. inserts
- B29K2715/006—Glues or adhesives, e.g. hot melts or thermofusible adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/70—Sealing arrangements specially adapted for windows or windscreens
Definitions
- the present invention relates to a new method of manufacturing automotive glazing comprising a peripheral localized preheating step of a primer layer by a flow of hot air, immediately before insertion thereof into the encapsulation mold.
- the term "encapsulation” refers to a method or step of overmolding a polymeric material around the perimeter of a window.
- the material is injected in the fluid state into a mold forming a sealed frame around the edge of the pane.
- the mold After hardening of the material by polymerization and / or crosslinking reaction (in the case of thermosetting polymers) or by cooling (in the case of thermoplastic polymers), the mold is opened and removed, leaving a profiled bead in contact with the wafer at the periphery of the glazing and with at least one of the two faces of the pane, often with both sides of the pane.
- the polymer forming the profiled bead is often an elastomer capable of acting as a seal between the glazing and the bodywork.
- Polymers that are not elastomers can, however, also be overmolded by encapsulation to perform other functions.
- the encapsulation step is generally preceded by a step of cleaning and activating the surface to be overmoulded, at the periphery of the glazing, and then a primer is applied to the activated zone intended to come into contact with the overmolded profiled bead.
- the primer layer must then be activated by heating to react with the encapsulating polymer.
- This heating step is generally carried out in furnaces having infrared radiation sources where the entire pane is heated uniformly at a temperature of about 60 ° C to 130 ° C.
- the hot pane is then quickly transferred to the encapsulation station where it is inserted into an encapsulation mold forming a sealed frame around its edge.
- the temperature of the mold cavity - generally between 30 ° C and 40 ° C - must be stabilized, for example by circulation of a coolant.
- the difference between the uniformly high temperature of the window and the moderate temperature of the mold which comes into contact with the window on the periphery thereof may lead to undesirable internal mechanical tensions, or even to problems of breakage of the window. at the time of encapsulation.
- the heating of the windows by infrared lamps in furnaces does not immediately make it possible to realize the failure of a lamp.
- An uneven heating will result in the manufacture of many parts where the encapsulation seal does not adhere satisfactorily to the glass.
- the present invention overcomes this disadvantage by ensuring a homogeneous activation of the primary.
- the present invention can significantly shorten the cycle time of the process by making superfluous step of cooling the glazing to room temperature at the end of the demolding step.
- U.S. Patent No. 5,544,458 discloses an encapsulation process wherein the glass receiving the polymeric seal and the primer are locally heated by means of an infrared lamp to a temperature of at least 250 ° F (about 120 ° C). ).
- the present application proposes a further improved local heating method compared to that disclosed in US 5,544,458.
- heating of the underlying glass is almost completely avoided by heating the primary by means of a heat exchanger. flow of hot air at very high temperature for a very short time.
- the method of the present invention is therefore faster than those of the state of the art, more economical in energy, simpler and less expensive to implement than that described in US 5 544 458.
- any internal mechanical tensions of the window are avoided thanks to the virtual absence of heating of the window itself.
- the present invention more particularly relates to a method of manufacturing glazing, preferably automotive glazing, comprising a) the provision of a window with two main faces and a wafer, having a shape allowing, without additional deformation, incorporate it as glazing into the bodywork of a vehicle, b) the application, on at least one main face of the glass along the edge thereof, of a primer composition so as to form, after drying, a layer of primer,
- the heating step (c) comprises selectively heating the primer layer to a temperature of between 60 and 90 ° C, by exposing the primer layer for less than 12 seconds, to a hot air flow which is at a temperature between 180 ° C and 280 ° C, while the temperature of the central portion of the glass, not covered by the primer layer, remains unchanged.
- the term "window” designates in the present application both monolithic panes formed of a single sheet of glass and laminated panes comprising at least two sheets of glass assembled to one another by means of a polymer sheet, generally called "laminating interlayer".
- the glazings produced by the method of the present invention are preferably automotive glazings, such as windshields, side windows, rear windows or even glazed roofs. They generally have a convex shape to incorporate them, without deforming them, in the body of a vehicle, preferably a motor vehicle.
- the liquid primer composition is applied to at least one main face of the pane, preferably on the two main faces and possibly also on the edge thereof.
- This application can be done manually or automatically by spraying or by application to the buffer.
- the solvent contained therein is allowed to evaporate to form a primer layer.
- This primer layer preferably covers the entire area where the encapsulating material will come into contact with the pane. This contact zone between the window and the encapsulation material is located in a peripheral zone of the window near the edge thereof.
- this peripheral zone of the glass covered by the primer layer extends continuously over the entire edge of the pane.
- the width of the peripheral zone of the window covered by the primer layer varies between 1 cm and 10 cm, preferably between 1.5 cm and 8 cm, in particular between 2 and 6 cm.
- the peripheral zone covered by the primer layer surrounds a central zone which will not come into contact with either the primer composition or the encapsulating material.
- This central zone typically represents from 70% to 98% of the surface of a main surface, preferably from 80% to 96% and in particular from 85% to 95% thereof.
- the peripheral zone of the window covered by the primer layer represents the complementary part of the surface of the main face of the window, that is to say typically from 3 to 30%, preferably from 4 to 20% and more. preferably 5 to 15% thereof.
- the selective heating of the primer layer is done by means of a hot air flow.
- the temperature of the hot air is preferably between about 200 ° C and 280 ° C, in particular between 220 ° C and 270 ° C.
- Such a flow of hot air can be created, for example by one or more juxtaposed fixed heat guns or by one or more mobile heat guns sweeping the zone to be heated and preferably controlled by an automatic system.
- the heat gun or guns inject the flow of hot air into a dispensing device which comprises an air flow channel whose shape is similar, or even identical to that of the zone to be heated.
- This air circulation channel comprises a plurality of through openings, preferably regularly spaced, through which the hot air is directed towards the window.
- the rapid and selective heating of the primer layer without heating the pane is allowed. It is considered that the heating tool is sufficiently efficient and therefore that the heating is sufficiently fast when the primer layer is brought from ambient temperature (20 ° C) to the activation temperature (60 - 90 ° C) less 12 seconds, advantageously in 3 to 12 seconds, preferably in 4 to 10 seconds and in particular in 5 to 8 seconds.
- the period between the end of the heating step and the beginning of the step of injecting an encapsulating composition into the mold cavity is preferably between 1 and 80 seconds, more preferably between 5 and 50 seconds, and in particular between 10 and 20 seconds.
- the encapsulation composition injected into the cavity of the encapsulation mold may be a thermosetting composition whose components react with each other after injection into the mold, or it may be a thermoplastic composition containing a plasticized and heat-fluidified polymer which is cured by cooling.
- thermoplastic encapsulation compositions are preferred, and examples of thermoplastic polymers of particular interest for encapsulation are thermoplastic elastomers (TPE), in particular thermoplastic styrene elastomers (TPE-S), and polyvinyl chloride. ) (PVC).
- TPE thermoplastic elastomers
- TPE-S thermoplastic styrene elastomers
- PVC polyvinyl chloride.
- TPE-Ss that can be used in the present invention mainly comprise the following families:
- SBS styrene-butadiene-styrene
- SEBS (styrene-ethylene-butadiene-styrene): copolymers obtained by hydrogenation of SBS,
- SEPS styrene-ethylene-propylene-styrene: copolymers comprising a poly (ethylene-propylene) central block flanked by two polystyrene blocks,
- copolymers obtained by hydrogenation of styrene-butadiene / isoprene-styrene copolymers.
- TPE substantially free of charges, or containing less than 5% mineral fillers, preferably less than 2% mineral fillers.
- Dryflex Hexpol TPE
- Evoprene AlphaGary
- Sofprene SOFTER
- Laprene SOFTER
- Asaprene Asahi Kasei
- Nilflex Dryflex (Hexpol TPE), Evoprene (AlphaGary), Sofprene (SOFTER), Laprene (SOFTER), Asaprene (Asahi Kasei), Nilflex
- These products may contain a certain fraction of plasticizers, plasticizers or organic lubricants which is considered herein. As part of the TPE-S fraction of the thermoplastic composition.
- the melting temperature of the TPE-S is advantageously between 180 ° C. and 210 ° C., in particular between 190 ° C. and 200 ° C.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1657039A FR3054168B1 (fr) | 2016-07-22 | 2016-07-22 | Procede d'encapsulation de vitrages automobiles |
PCT/FR2017/051997 WO2018015680A1 (fr) | 2016-07-22 | 2017-07-20 | Procede d'encapsulation de vitrages automobiles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3487692A1 true EP3487692A1 (fr) | 2019-05-29 |
Family
ID=56920841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17754397.2A Withdrawn EP3487692A1 (fr) | 2016-07-22 | 2017-07-20 | Procede d'encapsulation de vitrages automobiles |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3487692A1 (fr) |
KR (1) | KR20190032369A (fr) |
CN (1) | CN109476098A (fr) |
FR (1) | FR3054168B1 (fr) |
MX (1) | MX2019000922A (fr) |
WO (1) | WO2018015680A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110722961A (zh) * | 2019-09-20 | 2020-01-24 | 中国第一汽车股份有限公司 | 一种聚碳酸酯后角窗玻璃及其制备方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2691112B1 (fr) * | 1992-05-14 | 1995-07-21 | Saint Gobain Vitrage Int | Procede d'encapsulation d'un vitrage et vitrage ainsi obtenu. |
US5544458A (en) * | 1993-03-05 | 1996-08-13 | Donnelly Corporation | Vehicle panel assembly |
US8800222B2 (en) * | 2012-12-27 | 2014-08-12 | Agc Automotive Americas R&D, Inc. | Encapsulants for window assemblies |
-
2016
- 2016-07-22 FR FR1657039A patent/FR3054168B1/fr not_active Expired - Fee Related
-
2017
- 2017-07-20 KR KR1020197001638A patent/KR20190032369A/ko not_active Application Discontinuation
- 2017-07-20 MX MX2019000922A patent/MX2019000922A/es unknown
- 2017-07-20 CN CN201780045097.XA patent/CN109476098A/zh active Pending
- 2017-07-20 EP EP17754397.2A patent/EP3487692A1/fr not_active Withdrawn
- 2017-07-20 WO PCT/FR2017/051997 patent/WO2018015680A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
KR20190032369A (ko) | 2019-03-27 |
CN109476098A (zh) | 2019-03-15 |
MX2019000922A (es) | 2019-06-03 |
FR3054168A1 (fr) | 2018-01-26 |
FR3054168B1 (fr) | 2020-04-24 |
WO2018015680A1 (fr) | 2018-01-25 |
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Legal Events
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