WO2013131842A1 - Outil et procédé de réalisation d'un élément présentant une épaisseur réduite - Google Patents
Outil et procédé de réalisation d'un élément présentant une épaisseur réduite Download PDFInfo
- Publication number
- WO2013131842A1 WO2013131842A1 PCT/EP2013/054246 EP2013054246W WO2013131842A1 WO 2013131842 A1 WO2013131842 A1 WO 2013131842A1 EP 2013054246 W EP2013054246 W EP 2013054246W WO 2013131842 A1 WO2013131842 A1 WO 2013131842A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- injection
- outlet
- cavity
- wall
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 10
- 239000007924 injection Substances 0.000 claims abstract description 152
- 238000002347 injection Methods 0.000 claims abstract description 152
- 239000000463 material Substances 0.000 claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 18
- 238000012856 packing Methods 0.000 claims description 53
- 238000011144 upstream manufacturing Methods 0.000 claims description 33
- 239000012530 fluid Substances 0.000 claims description 18
- 230000000750 progressive effect Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- -1 polypropylenes Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012899 standard injection Substances 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
-
- 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
- B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C2045/279—Controlling the flow of material of two or more nozzles or gates to a single mould cavity
Definitions
- the present invention relates to a tool for producing an element having at least one zone of reduced thickness, the tool being of the type comprising an injection cavity delimited by a first wall intended to form the internal surface of the element and by a second wall intended to form the external surface of the element, said external surface being intended to be visible from the outside of the element, the tool further comprising at least one injection nozzle of a material of injection for forming the element, the outlet of said nozzle being in fluid communication with the injection cavity.
- the element is in particular a vehicle lining element, such as for example an automobile door panel, which requires an integrity exterior appearance over large dimensions.
- the invention also relates to a method of producing an element by means of such an embodiment tool.
- the number of injection points is not sufficient to allow the cavity to be completely filled without greatly increasing the injection pressure and / or to provide an injection material having a greater fluidity. It is then necessary to modify the production tool or to change the injection material, which considerably increases the production costs.
- the nozzles are generally arranged to inject the material into a zone of the cavity situated outside the zone intended to form a visible part of the packing element.
- the nozzles are not suitable for producing an element having a satisfactory appearance if they are arranged in a zone intended to form a visible zone of the element, because the very fast flow of the material from each nozzle causes the presence of traces on the visible surface of the element to the right of the injection points due to the very small desired thickness of the element.
- One of the aims of the invention is to overcome these drawbacks by proposing a tool for producing a member having a small thickness making it possible to obtain an element having a satisfactory appearance without requiring a heavily modified production tool and using a standard injection material, while maintaining acceptable production rates.
- the invention relates to an embodiment tool of the aforementioned type, wherein the outlet of the nozzle is in fluid communication with a zone of the first wall or the second wall in which the injection cavity is arranged to form the zone of reduced thickness of the element and the nozzle is arranged to open progressively between a closed position and an open position so as to progressively increase the injection rate of the injection material at the exit of the nozzle between its closed position and its open position.
- the fact of arranging the nozzle in the zone having a reduced thickness makes it possible to position the nozzle so that the cavity is completely filled during the injection of the material.
- Providing a gradually opening nozzle makes it possible to modulate the flow of the injected material so as to avoid any visible traces on the element even though the nozzle is disposed in an area of the cavity forming a visible zone of item.
- the outlet of the nozzle is in fluid communication with a zone of the first wall so that the injection material is injected on the side intended to form the inner surface of the element;
- the nozzle comprises a body extending upstream of the outlet of the nozzle, said body receiving the injection material to be injected into the injection cavity, a shutter of the outlet of the nozzle extending into said body and being mobile in translation in said body between a closed position in which the shutter closes the outlet of the nozzle and an open position in which the shutter is spaced from the outlet;
- the body and the outlet of the nozzle extend upstream of the first wall or the second wall, the outlet of the nozzle opening into a channel connecting the outlet of the nozzle to the injection cavity, the shutter comprising a tip extending in said channel, when the shutter is in its closed position;
- the body of the nozzle comprises a frustoconical zone having a frustoconical shape in axial section, said frustoconical zone extending directly upstream of the outlet, so that the volume of the nozzle increases progressively from the exit of the nozzle towards the upstream of the nozzle, so that the displacement of the shutter towards its open position causes an increase increase in the injection rate of the injection material at the outlet of the nozzle;
- the body of the nozzle comprises a plurality of wings extending radially from the body of the nozzle towards the center of the nozzle, the flanges defining between them cells having a substantially frustoconical shape in radial section so that the volume of the cells increases from the center of the nozzle towards the body of the nozzle, so that the displacement of the shutter towards its open position leads to a gradual increase in the injection flow rate of the injection material at the outlet of the nozzle;
- the shutter is held in the center of the nozzle by the radial wings of the body of the nozzle;
- the speed of movement of the shutter is adjustable so as to adjust the injection rate of the injection material at the outlet of the nozzle;
- the production tool comprises a plurality of injection nozzles whose output is in fluid communication with zones distributed in the first wall or in the second wall in which the injection cavity is arranged to form the zone of thickness; reduced packing element; and
- the production tool also comprises at least one injection nozzle whose outlet is in fluid communication with the injection cavity outside the zone of the first wall or the second wall in which the injection cavity is arranged to form the area of reduced thickness of the element.
- the invention also relates to a method of producing an element by means of a tool as described above, the method comprising the following steps:
- FIG. 1 is a schematic representation of an element showing injection points of the injection material provided in the embodiment of the invention
- FIG. 2 is a schematic representation in section of a portion of the embodiment tool according to the invention, showing an injection nozzle in the closed position,
- FIG. 3 is a schematic representation in section of the portion of the tool of FIG. 2, the injection nozzle being in an intermediate position between the closed position and the open position,
- FIG. 4 is a diagrammatic representation in section along the axis IV-IV of FIG.
- FIG. 5 is a schematic representation in section of the portion of the tool of FIG. 2, the injection nozzle in the open position, and
- FIG. 6 is a schematic representation in section along the axis VI-IV of FIG.
- an element 1 such as a packing element, for example a door panel as shown in FIG. 1, comprising an outer surface 2, intended to be visible, and an inner surface 4, intended to be invisible and to be mounted on a portion of a vehicle, for example a motor vehicle.
- Visible means that the outer surface 2 is not covered by a coating layer, such as a film, skin or other.
- the visible surface of the lining element forms an appearance surface of this lining element and is intended to be visible and directly touched by a user.
- At least one zone of the packing element 1 has a reduced thickness e between the outer surface 2 and the inner surface 4.
- the thickness of the packing element is understood to mean the distance separating the outer surface 2 from the inner surface 4 .
- the assembly of the packing element has a thickness e reduced between the outer surface 2 and the inner surface 4.
- a constant reduced thickness element on the whole element makes it possible to obtain an element of packing 1 of particularly good quality, as will be described later.
- the packing element has a reduced thickness in the area in which the outer surface 2 is visible and a thickness greater than the reduced thickness in a zone, in which the outer surface 2 is not intended to be visible, for example at the periphery of the packing element.
- the visible area of the packing element 1 is formed by a zone of reduced thickness.
- Reduced thickness means a thickness less than or equal to 2.2 mm, more particularly a thickness of between 1.8 mm and 2.2 mm and preferably between 1.9 mm and 2.1 mm, whereas a conventional packing element generally has a thickness of between 2.5 mm and 3 mm.
- the packing element 1 may also comprise one or more functional elements such as ribs, staple doors, or the like on the surface opposite to the visible surface, that is to say extending from the inner surface. 4 of the packing element 1. This or these functional elements extend projecting from the inner surface 4, substantially perpendicular to it, opposite the outer surface 2.
- the reduced thickness of the packing element is measured outside the one or more functional elements, which may have a thickness or thicknesses less than the reduced thickness and which comply, in a known manner, thickness ratios to avoid appearance defects on the visible surface.
- the packing element 1 is made of an injection material 6, of the plastic material type, for example thermoplastic material of the polyester type, or polyolefin, homopolymer or copolymer, or for example PC + ABS (polycarbonate and acrylonitrile). butadiene-styrene), these materials being able to be reinforced by mineral fillers or by fibers, natural or glass, by injection of this material into an embodiment tool 8, of the type comprising a first part 10 and a second part 12 defining between they have an injection cavity 14 having substantially the shape of the lining element 1 to be produced.
- the injection cavity 14 has a shape arranged to form a substantially planar element, this element being intended to be shaped subsequently in a press.
- the material injection 6 is conventional for this type of application.
- the present material at its specific transformation temperature, a viscosity ranging from 5 Pa.s to 1000 Pa.s at a specific shear rate range of injection ranging from 100 s "1 to 50 000s" 1 . Thanks to this characteristic, the material is injectable. It can then be used in most known injection processes, such as, for example, low pressure, high pressure injection, sandwich injection, bi-injection, compression injection and overmolding.
- the specific transformation temperature is the temperature at which the material is sufficiently fluid to be injected into a cavity (for example between 220 and 240 ° C for polypropylenes and between 260 and 280 for polycarbonates (PC) and acrylonitrile polymers). butadiene styrene (ABS) This specific transformation temperature is specific to each material.
- the production tool 8 is also conventional for this type of application.
- the first and second parts 10 and 12 are movable relative to each other between a spaced position, in which the packing element can be removed from the tool 8, and a closed position in which they form the injection cavity 14 hermetically closed.
- the cavity 14 is delimited by a first wall 16 formed by the first part 10 and by a second wall 18 formed by the second part 12, these walls extending opposite one another and being separated by a distance substantially equal to the thickness e of the packing element to be produced.
- the first wall 16 is intended to form the inner surface 4 of the lining element 1 and the second wall 18 is intended to form the outer surface 2 of the lining element 1.
- the cavity 14 may have a shape adapted to form in one piece the functional element or elements with the rest of the packing element by adapting the shape of the first wall 16 of the cavity accordingly, that is to say say by providing recessed areas having the shape of the functional elements to achieve.
- the first wall 16 is separated from the second wall 18 by a distance equal to the reduced thickness e, for example less than or equal to 2.2 mm, at least in the zone of the cavity 14 for forming the reduced thickness area of the packing element 1, as shown in FIGS. 2, 3 and 5.
- the distance separating the first wall 16 of the second wall 18 is constant and equal to the reduced thickness of the packing element.
- the distance separating the first wall 16 from the second wall 18 increases in the area of the cavity intended to form this zone of greater thickness.
- the production tool 8 comprises a plurality of nozzles 20 for injecting the injection material 6 into the cavity 14, the outlet of these nozzles 20 being in fluid communication with a zone opening into the cavity 14 on the first wall 16 and or on the second wall 18.
- the position of these nozzles 20 with respect to the filling element to be produced is shown schematically in FIG. 1.
- most of the nozzles 20 are arranged opposite a visible zone of the packing element 1, whereas they are usually arranged outside this zone in the prior art and arranged around the periphery of the packing element.
- the position of the nozzles 20 directly in a visible zone of the packing element and not at the periphery thereof allows the nozzles 20 to be distributed over a larger surface of the packing element 1, thereby reducing the thickness of the injection cavity 14 while ensuring that the injection material 6 completely fills the cavity 14 without the need to increase the injection pressure or to provide a more fluid injection material 6 with respect to the art prior.
- the cost of the production tool 8 and the manufacturing costs remain substantially identical to those of the prior art, while allowing to produce a lining element 1 of smaller thickness.
- the production tool in connection with the production of a door panel, the production tool comprises twelve nozzles 20, ten of which are distributed opposite the visible zone of the packing element 1 and two are arranged on the periphery of this one. this. These different nozzles 20 are arranged according to a diagram provided to ensure the complete filling of the cavity 14 and are open to inject the injection material 6 into the cavity 14 in a sequence to be described later.
- the nozzles 20 are arranged in the first part 10 of the tool 8 and their outlet is in fluid communication with a zone opening into the first wall 16.
- the injection material 6 is injected on the side of the inner surface 4 of the packing element not to be visible from the outside thereof, and, for most of the nozzles, directly opposite the outer surface 2 for be visible from outside the packing element.
- the outlet of the nozzles 20 arranged facing the visible zone of the packing element 1 extend along an axis substantially perpendicular to the second wall 18, that is to say along an axis substantially perpendicular to the visible external surface 4 of the packing element when it is in the cavity 14.
- Each nozzle 20 comprises a body 22 connected to a reservoir (not shown) of injection material 6 on one side and comprising an outlet 24 in fluid communication with the cavity 14 of the other.
- the outlet 24 is for example an opening arranged at one end of the body 22 opposite to that connected to a tank.
- the outlet 24 and possibly the body 22 of the nozzle 20 extend along an axis substantially perpendicular to the second wall 18 of the the cavity 14, that is to say along an axis substantially perpendicular to the visible outer surface 4 of the packing element when it is in the cavity 14.
- Each nozzle 20 comprises means, known per se, for conveying the injection material 6 of the reservoir at the outlet 24 where the material is injected into the cavity 14 at a predetermined pressure and in a flow, or flow, controlled. More particularly, each nozzle 20 is adapted so that the output stream 24 of the nozzle increases gradually when the nozzle 20 is open, as will now be described.
- upstream and downstream are defined with respect to the direction of flow of the injection material 6.
- the body 22 extends upstream of the outlet 24 and the reservoir extends upstream of the body.
- the nozzle 20 extends upstream of the first wall 16 so that the outlet 24 of the nozzle 20 opens into a channel 25 connecting the outlet 24 of the nozzle 20 to the zone opening into the injection cavity 14.
- the body 22 and its outlet 24 do not open directly into the cavity 14 and the injection material 6 passes through the channel 25 before reaching the cavity 14, the channel 25 comprising an outlet opening into the first wall 16.
- the temperature of the nozzle in particular that of the nozzle body taken at its outlet arranged in the first wall of the cavity, is greater than that of the first wall of the first part of the tool taken near where the nozzles open into the cavity.
- This difference in temperature generates differences in material flow around the injection point, which causes appearance defects on the visible surface.
- the channel 25 extends along an axis substantially perpendicular to the second wall 18, that is to say along an axis substantially perpendicular to the outer surface. 4 visible from the packing element when it is in the cavity 14 and is therefore directly opposite the visible area of the packing element.
- Each nozzle 20 comprises a shutter 26 of the outlet 24 movable between a closed position (FIG 2) in which the shutter 26 closes the outlet 24 so as to to prevent the injection material 6 from entering the cavity 14, that is to say that the flow of injection material at the outlet is zero, and an open position (FIG.5) in which the shutter is released of the outlet 24 and wherein the flow of injection material 6 at the nozzle outlet is at its maximum.
- a closed position in which the shutter 26 closes the outlet 24 so as to to prevent the injection material 6 from entering the cavity 14, that is to say that the flow of injection material at the outlet is zero
- an open position FIG.5
- the shutter 26 gradually disengages (Fig. 3) from the outlet 24 and the flow of the injection material 6 at the nozzle outlet increases progressively from a zero flow to its maximum flow when the shutter 26 is in the open position.
- the channel 25 has for example a cylindrical shape of revolution with a diameter of between 2 mm and 6 mm.
- the shutter 26 is for example formed by a rod movable in translation in the body 22 of the nozzle 20 between its closed position and its open position and comprises at its downstream end a tip 28 of substantially complementary shape to that of the channel 25 so that the tip 28 extends into the channel 25 and blocks it when the shutter 26 is in its closed position, as shown in FIG. 2.
- the outer surface of the nozzle 28 is in contact with the inner surface of the channel 25, when the shutter 26 is in its closed position so that the channel 25 is sealed by the nozzle 28 ' extending outside the nozzle 20.
- the nozzle 28 extends completely into the channel 25 in the closed position of the shutter.
- the surface of the end of the nozzle 28 thus extends in the continuity of the surface of the first wall 16, so that this first wall 16 does not have a discontinuity at the channel 25 when the shutter 26 is in the closed position.
- the body 22 of the nozzle 20 widens by flaring linearly so that the body 22 has a frustoconical shape 30 in axial section, that is to say say in a plane extending along the axis of the nozzle 20, directly upstream of the outlet 24, so that the volume of the nozzle 20 increases progressively from the outlet 24 of the nozzle upstream of the nozzle .
- Other forms may of course be used, for example parabolic, these other forms to ensure that the volume of the nozzle 20 increases gradually from the outlet 24 of the nozzle upstream of the nozzle.
- the body 22 of the nozzle Upstream of the frustoconical zone 30, the body 22 of the nozzle has a substantially cylindrical shape of revolution.
- the frustoconical zone 30 makes it possible to pass from a diameter substantially equal to that of the channel 25 directly upstream of the outlet 24 to a diameter that is substantially 3 to 6 times larger. directly upstream of the frustoconical zone 30. It is thus clear that the volume of injection material 6 present in the nozzle increases progressively in the frustoconical zone 30 from downstream to upstream.
- the body 22 of the nozzle further comprises a plurality of wings 32 extending radially from the body 22 of the nozzle towards the center of the nozzle. At their downstream end, extending in the frustoconical zone 30, the wings 32 comprise a shoulder 34 extending up to the stem of the shutter 26 so as to ensure a centering of the shutter 26 in the body 22 of the nozzle and guide the tip 28 to the channel 25 when the shutter 26 moves to its closed position.
- the body 22 of the nozzle comprises for example three fins 32 distributed on the perimeter of the body 22 and defining between them cells 36 extending between the body 22 of the nozzle and the shutter 26.
- the distance between two fins 32 defining a cell 36 progressively decreases from the body 22 towards the center of the nozzle so that the cells 36 have substantially a frustoconical shape in radial section, that is to say in a plane extending substantially perpendicular to the axis of the nozzle.
- the volume of the cells 36 progressively increases from the center of the nozzle 20 to the body 22 of the nozzle.
- the transition from the closed position to the open position of the shutter 26 is done by moving the tip 28 of the shutter 26 in the frustoconical zone 30 in a downstream-upstream direction, so that more and more injection material 6 can pass through the outlet 24 as the opening of the nozzle 20 due to the shape of the cells 36 and the frustoconical zone 30, as can be understood by comparing FIGS. 6 which are cross-sectional views in radial plane in which the shutter 26 is in an intermediate position between the closed position and the open position (Fig. 4) and in the open position (Fig. 6) . It can be seen between these two figures that the quantity of injection material 6 coming out of the nozzle increases progressively so that the flow of the injection material 6 increases progressively during the opening of the nozzle 20.
- the injection material 6 passes only through channels 38 of small size defined by the size of the cells 36 in the downstream bead of the frustoconical zone 30 as shown in FIG. 4.
- the channel size has increased, allowing a larger amount of injection material to pass through the outlet.
- the injection cavity 14 is closed by moving the first and second parts 10 and 14 of the tool 8 to their closed position.
- one or more nozzles 20, called “upstream nozzles" forming a first group of nozzles 20 are open so that the injection material 6 flows into the cavity 14 from these upstream nozzles through the channels 25 and spreads in the cavity 14 around these nozzles.
- the upstream nozzles are for example the nozzles disposed at the periphery of the packing element or one or more of the central nozzles.
- the upstream nozzles are open so as to inject the injection material at a pressure substantially equal to that which the skilled person would use to inject conventional packing elements having a thickness of between 2.5 mm and 3 mm.
- the injection material from the upstream nozzles spreads in the cavity and reaches the nozzle or nozzles 20, called downstream nozzles, forming a second group of nozzles 20, arranged around the upstream nozzles, as represented by the arrow f of FIG. 2.
- the injection material 6 from an upstream nozzle has not reached a channel 25 in fluid communication with a downstream nozzle outlet 24, this downstream nozzle remains closed and does not inject material into the cavity.
- the travel time of the shutter 26 is adjustable so as to adjust the injection rate of the injection material 6 at the outlet 24 of the nozzle.
- the flow of injection material 6 at the outlet of the nozzle 20 is substantially perpendicular to the second wall 18, that is to say according to a axis substantially perpendicular to the visible outer surface 4 of the packing element when it is in the cavity 14, because of the orientation of the channel 25 and the outlet 24 of the nozzle 20.
- This flow is then reoriented according to a direction substantially parallel to the second wall 18 due to the shape of the cavity 14. It will be noted that usually the injection of the flow directly opposite the visible zone and perpendicular to it is a source of appearance defect, this is not the case with the method according to the invention and by providing a reduced thickness in the visible zone.
- each nozzle 20 The progressive opening of each nozzle 20 is controlled so that the flow of the injection material 6 circulating in the cavity does not undergo acceleration when the injection material 6 from this nozzle is added to the material circulating in the cavity . Indeed, for conventional nozzles opening abruptly at its maximum flow, the material from these nozzles causes an acceleration of the flow in the cavity, which forms marks on the outer surface of the element to the right places where the flow has suddenly accelerated. Due to the progressive opening of the nozzles 20, the flow undergoes substantially no acceleration and therefore does not form a mark on the outer surface 2 of the trim element produced. However, the gradual increase in the flow rate of each nozzle 20 makes it possible to maintain filling rates of the cavity and therefore production rates of the packing elements acceptable and comparable to those of the prior art.
- the production tool 8 and the production method described above make it possible to obtain packing elements having a reduced thickness, for example less than or equal to 2.2 mm, or even less than or equal to 2 mm, which allows to lighten considerably the packing element thus obtained.
- a packing element having a thickness substantially equal to 2 mm has a mass 15% to 20% lower than a conventional packing element having a thickness substantially between 2.5 mm and 2.7 mm.
- the lining element obtained has a satisfactory appearance, without mark on its external surface 2 due to the injection of the injection material 6 and the production rates are maintained without incurring additional costs on the production tool or in the choice of the injection material 6.
- the packing element is suitable for use directly after its completion, without finishing operation and without modifying its external surface 2, for example by adding a coating layer intended to modify its appearance and its texture.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014600103U JP3196806U (ja) | 2012-03-05 | 2013-03-04 | 薄い厚さの部品を生産するための用具 |
CN201390000337.1U CN204354385U (zh) | 2012-03-05 | 2013-03-04 | 用于实施具有至少一减小厚度区域的元件的实施工具 |
DE212013000080.4U DE212013000080U1 (de) | 2012-03-05 | 2013-03-04 | Werkzeug zur Herstellung eines eine verringerte Dicke aufweisenden Elements |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1251998 | 2012-03-05 | ||
FR1251998A FR2987576B1 (fr) | 2012-03-05 | 2012-03-05 | Outil et procede de realisation par injection d'un element presentant une epaisseur reduite |
Publications (1)
Publication Number | Publication Date |
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WO2013131842A1 true WO2013131842A1 (fr) | 2013-09-12 |
Family
ID=47757631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2013/054246 WO2013131842A1 (fr) | 2012-03-05 | 2013-03-04 | Outil et procédé de réalisation d'un élément présentant une épaisseur réduite |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP3196806U (fr) |
CN (1) | CN204354385U (fr) |
DE (1) | DE212013000080U1 (fr) |
FR (1) | FR2987576B1 (fr) |
WO (1) | WO2013131842A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3015340A1 (fr) * | 2013-12-20 | 2015-06-26 | Faurecia Interieur Ind | Outil de realisation d'un element de vehicule comprenant une buse a ouverture progressive |
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DE202015106658U1 (de) | 2014-12-10 | 2016-01-18 | Inglass S.P.A. | Injektor für Vorrichtungen zum Spritzgießen von Kunststoff |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030082266A1 (en) * | 2000-04-12 | 2003-05-01 | Denis Babin | Injection nozzle system and injection molding machine incorporating same |
EP1860155A1 (fr) * | 2005-03-16 | 2007-11-28 | Teijin Chemicals, Ltd. | Composition de résine |
EP2226173A1 (fr) * | 2009-03-06 | 2010-09-08 | Incoe International Inc. | Procédé de moulage par injection, notamment de moulage par injection en cascades, et dispositif d'exécution |
EP2360003A1 (fr) * | 2010-02-18 | 2011-08-24 | PSG Plastic Service GmbH | Procédé et dispositif de commande d'une buse d'obturateur à aiguille d'un outil de moulage par injection |
-
2012
- 2012-03-05 FR FR1251998A patent/FR2987576B1/fr not_active Expired - Fee Related
-
2013
- 2013-03-04 CN CN201390000337.1U patent/CN204354385U/zh not_active Expired - Lifetime
- 2013-03-04 JP JP2014600103U patent/JP3196806U/ja not_active Expired - Lifetime
- 2013-03-04 DE DE212013000080.4U patent/DE212013000080U1/de not_active Expired - Lifetime
- 2013-03-04 WO PCT/EP2013/054246 patent/WO2013131842A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030082266A1 (en) * | 2000-04-12 | 2003-05-01 | Denis Babin | Injection nozzle system and injection molding machine incorporating same |
EP1860155A1 (fr) * | 2005-03-16 | 2007-11-28 | Teijin Chemicals, Ltd. | Composition de résine |
EP2226173A1 (fr) * | 2009-03-06 | 2010-09-08 | Incoe International Inc. | Procédé de moulage par injection, notamment de moulage par injection en cascades, et dispositif d'exécution |
EP2360003A1 (fr) * | 2010-02-18 | 2011-08-24 | PSG Plastic Service GmbH | Procédé et dispositif de commande d'une buse d'obturateur à aiguille d'un outil de moulage par injection |
Non-Patent Citations (1)
Title |
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ROTTIG H-J: "Vom Einschiessen zum Einfliessen", KUNSTOFFE INTERNATIONAL, CARL HANSER VERLAG, MUNCHEN, DE, no. 11, 1 November 2011 (2011-11-01), pages 31 - 34, XP001526028, ISSN: 0023-5563 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3015340A1 (fr) * | 2013-12-20 | 2015-06-26 | Faurecia Interieur Ind | Outil de realisation d'un element de vehicule comprenant une buse a ouverture progressive |
Also Published As
Publication number | Publication date |
---|---|
DE212013000080U1 (de) | 2014-10-15 |
FR2987576B1 (fr) | 2014-04-11 |
CN204354385U (zh) | 2015-05-27 |
JP3196806U (ja) | 2015-04-09 |
FR2987576A1 (fr) | 2013-09-06 |
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