EP2512771A1

EP2512771A1 - Method and device for producing a fibre-reinforced injection-moulded plastic part

Info

Publication number: EP2512771A1
Application number: EP09801206A
Authority: EP
Inventors: Reiner Just; Jürgen KERN
Original assignee: GM Tec Industries Holding GmbH
Current assignee: GM Tec Industries Holding GmbH
Priority date: 2009-12-16
Filing date: 2009-12-16
Publication date: 2012-10-24
Also published as: WO2011072739A1

Abstract

The present invention relates to a method for producing an injection-moulded plastic part (3, 3'), which is reinforced with a flat reinforcement material, in particular reinforced with woven or non-woven fabric, wherein the method comprises the steps of holding a reinforcement material (30), in particular a woven fabric or a non-woven mat, seated against a mould wall in an injection mould, providing a first mould cavity (20) on one face of the reinforcement material, injecting a plastic material into the first mould cavity, subsequently providing a second mould cavity (22) on the second face of the reinforcement material, and injecting a plastic material into the second mould cavity.

Description

Process for producing a fiber-reinforced

Plastic injection molded part

Technical area

The present invention relates to a method for

Production of a fiber-reinforced, in particular

fabric reinforced, plastic injection molded part, a

Apparatus for carrying out the method, and a plastic injection-molded part produced by the method.

Background of the invention

It is known by fiber-reinforced plastic parts

Laminating at least one layer flat

Reinforcing material with a plastic material

manufacture. In this case, typically a first layer of plastic material is first applied to a positive or negative mold, then the sheet-like reinforcing material is placed on the plastic sheet and laminated together by applying at least one further layer of plastic material. In this way, simply flat plastic parts can be produced, as used for example in boat use. Typically, fiberglass mats are used as a flat reinforcing material, wherein the fiberglass mats can be present as a fabric or as a nonwoven.

Fiber reinforced plastic is also in the range of

Injection molding, here are the respective

However, fiber materials as short or long single fibers together with the plastic melt in the respective

Injection molding tool injected. Accordingly, the individual fibers are largely randomly oriented in the resulting plastic injection molded part, depending on the respective

Flow behavior of the plastic melt. In the field of injection molding, however, have been no surface reinforcing materials in the

Plastic injection molded parts introduced, especially not because it was assumed that an exact

Positioning these reinforcing materials in the

Injection molding tool is not possible and the

Reinforcing material would move during injection of the plastic material into the respective injection mold with the flow of the liquid plastic material.

From DE 10 2008 055 477 AI a method is known in which a prefabricated half-product, which comprises at least one non-woven mat and at least one insert, is laminated with a plastic. A disadvantage of this

Method is the high time required to produce the fiber-reinforced semi-finished product, which is then laminated in a second step to the fiber-reinforced composite part. The method shown is not an injection molding process.

From US 2009/0050263 Al is a method for producing a preform by means of a lamination process, and a corresponding apparatus for producing this preform. A disadvantage of this method is the high amount of time that is not suitable for efficient mass production.

description

Starting from the known methods, it is an object of the present invention to provide a method for producing a reinforced with a flat reinforcing material, in particular fabric-reinforced or non-woven reinforced,

Runststoffspritzgussteil provide.

Such a method for producing a with a

reinforced reinforcing material reinforced, in particular fabric-reinforced or non-woven reinforced, Plastic injection-molded part comprises the steps of holding a sheet-like reinforcing material, in particular a fabric or a non-woven mat, in a cavity of a

Injection molding tool adjacent to a tool wall, providing a first mold cavity on one side of the reinforcing material and the subsequent injection of a plastic material in the first mold cavity.

Thereafter, a second mold cavity is provided on the second side of the sheet reinforcing material, and a plastic material becomes in this second

Mold cavity injected.

Due to the fact that the planar reinforcing material rests against the tool wall on one side and is held in the first injection molding step, it can be avoided that the reinforcing material shifts uncontrollably in the mold cavity during injection of the plastic melt or "floats away" together with the flow of the plastic melt Rather, it is achieved by the arrangement of the reinforcing material on the tool wall that in a defined

Orientation is held in the mold cavity. Due to the direct contact of the sheet-like reinforcing material on the tool wall, it is particularly possible that the sheet-like reinforcing material not only with respect to its two

Surface dimensions (height and width) is held in a defined orientation, but it can by a

Contouring of the corresponding tool wall and a three-dimensional orientation of the reinforcing material can be achieved. The planar reinforcing material can therefore also be provided with a shape or contour in the direction of its surface normal {depth}.

By suitable choice of the position of the Anspritzkanals relative to the held reinforcing material can also be achieved that the reinforcing material flows into a controlled contour in a certain contour of the respective tool wall. In this way it is possible to use the plane

Reinforcing material in a plastic injection molded part in a suitable manner three-dimensional position.

Furthermore, it is possible by the successive steps of injection molding on both sides of the reinforcing material, on both sides of the reinforcing material

build any structures. These structures are the typical features of an injection molded part. With the

It is now possible to further strengthen the known injection-molded structures with a sheet-like reinforcing material positioned at any position and in any desired orientation in the resulting injection molded part.

The introduction of the reinforcing material in the

Plastic injection molded part does not exclude that the

Plastic melt continues with short or long

Single-fiber is reinforced.

By providing the first mold cavity on one side of the reinforcing material, an injection-molded part is produced in this way, which on this side of the sheet-like reinforcing material, the structure of any wall thickness and / or any injection molding structures,

starting from the reinforcing material, allows. By subsequently providing a second mold cavity on the other side of the sheet-like reinforcing material, ie on the opposite side, any wall thickness or structure of plastic material can also be constructed on this side of the sheet-like reinforcing material. Accordingly, by means of the specified

Method are obtained with a sheet-like reinforcing material, in particular a fabric mat or a nonwoven mat, reinforced plastic injection molded part, in which any wall thickness can be built on both sides of the reinforcing material. Furthermore, the Oberflächenbeschaf unit on both

Pages of the obtained plastic injection molded part can be improved, since the respective outer sides of the obtained

Plastic injection molded part are formed by corresponding structurable or contourable tool surfaces.

By the method described are not only the

Surface appearance and any thickness structuring of the plastic injection molded part achieved, but it is also possible to perform the plastic injection molded part without the additional step of producing a semi-product or preform, so that here short

Manufacturing times or cycle times can be realized.

To carry out the method, the reinforcing material can be applied to a mandrel and the mandrel for

Provision of the second mold cavity to be withdrawn accordingly. In this way, the process using nuclear retraction technology can be efficient and time-saving

be performed.

Compared with the conventional method of lamination, the present method is significantly faster, since the present method can be carried out in principle with the cycle of an injection molding machine. This makes the application possible even for larger quantities.

Preferably, the method is on a

Two-component injection molding machine used, wherein on the one side of the reinforcing material, a first

Plastic material on the second side of the

Reinforcing a second plastic material

can be used. Accordingly, on the inside of a plastic injection molded part another

Plastic material be present, as on the outside. In particular, a plastic material with a different color can also be used.

Preferably, the sheet-like reinforcing material is applied to the wall of the injection molding tool by means of at least one

Holding mechanism, in particular at least one retaining pin, held in position until the plastic material in the

Injection molding tool on the first page of the

Reinforcing material was injected. It is preferred after injecting the plastic material in the

Injection molding tool on the first page of the

Reinforcing material of the holding mechanism solved as long as the plastic is still flowable. In this way it is possible that the possibly resulting from the holding mechanism defects in the plastic injection molded part can be closed, in particular by the

Applied reprint during the injection process.

In a variant, before the release of the holding mechanism, an at least partial curing of the injected

Plastic material awaited, so that by the

Holding mechanism in the plastic injection molded part

introduced imprints, and in particular the through

Retaining pins caused openings, preserved in the resulting plastic injection molded part. These impressions or openings can later for example for

Positioning of the plastic injection molded part serve.

An alternative or additional retention mechanism is achieved by clamping the reinforcement material between two mold halves. The reinforcing material must be dimensioned accordingly to between the

appropriate tool halves can be arranged and clamped.

According to a further embodiment, the second

Tool cavity on the second side of the Reinforcement material be provided by the fact that the plastic injection molded part after the injection of the

Plastic material in the injection mold on a first side of the reinforcing material in a second

Werkzeugkavität is implemented, in which the second

Mold cavity is provided accordingly. Preferably, this movement of the plastic injection-molded part is achieved by a displacement of a first tool half relative to a second tool half, in particular by a rotation of the two tool halves against each other. In this way, the procedure can be efficient and with a short

Cycle time to be performed.

In particular, when the implementation of the plastic injection molded part is carried out in that one tool half is displaced, in particular rotated, relative to the other tool half, the plastic injection-molded part must be made of the first

Injection process can not be removed from the first mold half, but remains in the first mold half, which is then rotated relative to the second mold half such that the plastic injection molded part from the first injection into a second mold cavity

is introduced.

The provision of the second mold cavity may also be accomplished by reacting the in the first mold cavity

manufactured plastic injection molded part into another

Tool cavity can be achieved.

In a further variant of the method, the

Reinforcing material first in a preforming tool

attached to a wall and plastic material is placed in this preforming tool on a first side of the

Reinforced material injected. Then that will be

Plastic injection molded part implemented in another injection molding tool and in the second provided there

Mold cavity injected with a plastic material. Preferably, the plastic injection molded part is held in the second tool cavity by the same holding mechanism as in the preforming tool.

In particular, in this variant of the method, it is advantageous for the impressions or openings produced by the holding mechanism in the preforming tool

to obtain plastic injection molded part obtained in order to keep defined by these defined positions the plastic injection molded part in the injection mold.

In order to reduce imperfections in the resulting plastic injection molded part, it is preferable to release the holding mechanism as long as the plastic material injected into the first mold cavity is still flowable and the imperfections left in the first tool cavity

Plastic injection molded part are in particular by the

Applying a reprint substantially closed.

Preferably, the first mold cavity and the second mold cavity in the same injection mold

provided in this way an efficient

To achieve process flow of injection molding and to achieve accurate dimensional accuracy.

The first tool cavity is preferred by positioning a first tool half with respect to a second tool cavity

Tool half provided, and the second

Mold cavity is provided in a second position of the first mold half with respect to the second mold half to achieve efficient positioning and process flow.

The area used in the described method

Reinforcing material is preferably in the form of a flat fabric part and / or in the form of a flat non-woven mat, which has a flexibility perpendicular to the surface normal, provided.

In the method described, it is also possible to use at least two planar reinforcing materials, so that from this a plastic injection-molded part with reinforcing material arranged at different locations, or with two or more layers of superimposed one another

Reinforcing material results. It can too

different materials than the plane

Reinforcement material can be used, so that the

Material properties of the result

Plastic injection molded part can also be adjusted by the choice of materials of the reinforcing material.

Preference is given in the process in the second

Mold cavity, a second sheet reinforcing material in the mold cavity on the mold wall adjacent and after the injection of the plastic material in the second mold cavity, a third mold cavity is provided on the second side of the second sheet reinforcing material, in which another plastic material is injected. In this way, the second planar reinforcing material in the resulting

Position the plastic injection molded part as desired and provide it with a three-dimensional contour. This process step can be repeated as often as desired in order to achieve a corresponding layering of layers of reinforcing material and layers of plastic material. The thickness of the

Plastic material between the reinforcing layers can by the appropriate dimensioning of the respective

Tool cavities are set. The shape of the respective reinforcing layers can be predetermined by the corresponding contouring of the tool wall against which the respective reinforcing lugs abut. Accordingly, an individual profile can be formed for each reinforcement layer of the layered structure. The present description further also relates to a plastic injection molded part, which by means of

described method was prepared. In particular, the description also refers to such

Plastic injection molded part, in which a flat

Reinforcing material, in particular a nonwoven mat or a fabric, is enclosed on a first side of a plastic material and on a second side of a further plastic material is enclosed, wherein the plastic material at least on one side of the

Reinforcing material has a three-dimensional structure. In this way, the known

Inject injection molding structures with the advantages of introducing a flat reinforcing material.

In a further embodiment, the planar

Reinforcement material only in one area of the

Plastic injection molded part can be provided. Such a selective reinforcement of the plastic injection-molded part results in new design possibilities, in particular also with regard to special lightweight construction. The areal

Reinforcing material can then take over the strength functions of three-dimensional injection molding contours.

In the plastic injection-molded part, a second planar reinforcing material may be positioned, in particular spaced in the direction of the surface normal of the first

Reinforcing material. There may also be more than two layers of the reinforcing material layered, which may be arranged in particular at different distances from one another and at least two reinforcing layers may have a mutually different contour.

The present description also relates to an apparatus for producing a Plastic injection molded part. In this case, the device comprises an injection molding tool with a first mold half and a second mold half, wherein a tool cavity is so

is formed such that a reinforcing material is held by means of a holding mechanism in the mold cavity in such a manner against a wall of the cavity that on one side of the reinforcing material, a first mold cavity

provided. Furthermore, a mechanism for

Providing a second mold cavity on the other side of the reinforcing material after a plastic material enters the first mold cavity

was injected.

Preferably, the first mold half has at least one

Tool cavity on, by means of which the first

Mold cavity may be provided, and the second mold half has at least two tool cavities, wherein the first mold cavity of the second mold half is formed so that by means of the holding mechanism

Reinforcing material can be kept adjacent to one wall of the mold cavity, and the second

Tool cavity of the second mold half is designed such that the second mold cavity can be provided, wherein the Werkzeugkavität the first mold half both with respect to the first mold cavity of the second mold cavity

Tool half, as well as with respect to the second cavity of the second Werkzeughälf e can be positioned.

Brief description of the drawings

In the following, exemplary devices for carrying out the method, the method itself, as well as plastic injection molded parts produced by the method will be described with reference to the accompanying drawings.

Showing: Figure 1 shows schematically an injection molding tool, wherein by means of core retraction technique, a mandrel can be withdrawn, wherein the mandrel is shown in Figure 1 in a first, advanced position and a first mold cavity is formed in the injection mold;

FIG. 2 shows the injection molding tool of FIG. 1 in one

A state in which the mold core is retracted to a second position to form a second mold cavity; shows a second variant of a

Injection molding tool, wherein a first

Tool half and a second tool half can be moved relative to each other and in particular can be rotated against each other to form a corresponding first and a second mold cavity can; shows a preforming tool for performing the method according to another

Embodiment, wherein in the preform a first mold cavity is formed; shows an injection molding tool with a second mold cavity, in which a molded with the preforming tool according to Figure 4 plastic injection molded part is inserted; and shows a fiber reinforced

Plastic injection molded part, which in the

Injection molding tool according to Figure 3 was produced

Detailed description In the following, a device or a system for

Implementation of the method for producing a reinforced with a flat reinforcing material, in particular fabric-reinforced or non-woven reinforced,

Plastic injection molded part are described. there

the same reference numerals designate the same or similar

Elements or components in the respective figures and a repeated description may be omitted to

Avoid repetitions.

FIGS. 1 and 2 show a first injection molding tool 1 which comprises a first tool half 10, a second tool half 12 and a mold core 14. The mold core 14 is movable relative to the first mold half 10 and the second mold half 12 and can thus produce a second mold cavity.

1 shows a configuration of the injection molding tool 1, according to which the mold core 14 in a first

Position is present and in the injection molding tool 1, a first mold cavity 20 is formed. To the

Plastic melt in the first mold cavity 20

to be able to inject, a first runner 16 is provided in the first mold half 10, which communicates with the first mold cavity 20.

In Figure 2, the injection molding tool 1 shown in Figure 1 is shown in a second configuration, according to which a second mold cavity 22 is formed by retracting the mold core 14 relative to the state shown in Figure 1. A second runner 18 is in the second

Tool half 12 is provided, wherein the second runner 18 communicates with the second mold cavity 22 and for injecting the plastic melt in the second

Tool cavity 22 is used. To a plastic injection molded part according to the present

To produce described method, a flat reinforcing material in the form of a fabric mat 30 is first introduced into the first mold cavity 20. In this case, the fabric mat 30 is introduced so that it rests flat against the mold cavity 20 the final wall of the mold core 14.

In order to achieve a fixation of the fabric mat 30 in the mold cavity on the wall of the mold core 14, regardless of the actual position of the tool, the fabric mat 30 is held by a plurality of retaining pins 40. The retaining pins 40 protrude into the first mold cavity 20 and the

Fabric mat 30 can be fixed to these retaining pins 40 in their position such that the fabric mat 30 is held adjacent to the wall of the mandrel 14.

Although the wall of the mandrel 14 in the figure 1 plan

can also be contoured in a desired manner to the reinforcing material 30 in a corresponding three-dimensional shape in the

to orient the resulting plastic injection molded part.

Then, the injection mold 1 is closed by pressing the first mold half 10 hydraulically and / or electrically onto the second mold half 12. Subsequently, a first plastic melt can be injected into the first mold cavity 20 via the sprue 16. The first shot of the injection process is injected with a dependent of the injected plastic material and the geometry of the tool pressure, for example, at a pressure of about 200 bar.

In a particularly advantageous variant of the method is directly after the introduction of the first shot of the

Retaining mechanism in the form of the retaining pins 40 solved or the retaining pins 40 are withdrawn, so that through the retaining pins 40 formed in the molded part impressions due to the still somewhat flowable plastic and due to the injected of the plastic material and the

Geometry of the tool dependent reprinting, for example, from about 600 bar, close.

Then, to make a second mold cavity 22, the core 14 becomes relative to the second mold half 12

retracted to the second tool cavity 22 to

define. The second mold cavity 22 is formed in a region between the fabric mat 30 and the wall of the core 14.

After the formation of the second mold cavity 22, a further plastic material is then introduced into this second mold cavity 22 via the second runner 18 in a further shot of the injection process.

The injection-molded part 3, which carries the reinforcing material 30 and on one side of the reinforcing material 30 the plastic layer 32 injected in the first step, receives in accordance with the second injection process also on the other side of the reinforcing material 30 a

Plastic layer. Both the first and the second

Plastic layer can, as customary in injection molded parts, be arbitrarily structured. In particular, according to the described method, it is possible to supply the sheet reinforcing material 30 at an arbitrary position within the resulting injection-molded part

position. The on both sides of the plane

Reinforcing material constructed plastic structures can virtually any wall thickness perpendicular to the

Accept reinforcing material.

Depending on the desired plastic injection-molded part in the process with the injection molding tool shown in Figures 1 and 2 can be injected over the first Runner 16 and when injecting the second

Gutter channel 18 different plastic materials

be used. In particular, on one side of the sheet-like reinforcing material 30, a hard

Plastic material used and on the other hand, a soft, such as a rubber-like material or a plastic material of other colors. Such

Injection molded part may be required, for example, if the mechanical and / or chemical properties of the

resulting plastic injection molded part on the inside and the outside should be different.

Furthermore, it is possible in the disclosed method, the planar reinforcing material 30 not only in one

On the contrary, it is also possible for the planar reinforcing material 30 to be arranged in a three-dimensional alignment within the plastic injection molding part

To arrange plastic injection molded part. In particular, it is possible, for example, by a corresponding configuration of the wall of the mold core 14, the flat

Reinforcing material 30 in a wavy, concave, convex or any other form form. The shape of the wall against which the sheet-like reinforcing material 30 abuts is then assumed by the sheet-like reinforcing material 30 and subsequently in the resulting

Retain plastic injection molded part. For example, in this way, a fabric mat in the plastic injection molded part in a zigzag, concave, convex or

wavy arrangement is present.

The proposed method has the further advantage that for the first time a planar reinforcing material 30, which has a high flexibility due to its material properties as non-woven mat or as a fabric, in one

Injection molding in a defined orientation to Reinforcement of a plastic injection molded part to be used.

The core retraction method used in the method shown in Figs. 1 and 2 has the advantage that the second die cavity 22 can be made by simply retracting the mandrel 14, and thus a particularly high clock frequency can be achieved ,

In a second exemplary embodiment, which is shown in FIG. 3, a second device 1 'for carrying out the method is shown, which has a first tool half 100 and a second tool half 120. The first

Tool half 100 is rotatable relative to the second tool half 120 about a rotation axis 110 such that two

different mold cavities by means of rotating the first mold half 100 relative to the second

Tool half 120 can be made.

In particular, the first tool half 100 has at least one tool cavity 200 and the second tool half 120 has a first tool cavity 220 and a second tool cavity 222 which are symmetrical to the axis of rotation 110 and complementary to the tool cavity 200 of the first

Tool half 100 are arranged. The first tool cavity 220 and the second tool cavity 222 of the second

Tool half 120 have different inner contours.

In one variant, the plastic injection-molded part produced in the first tool cavity can in another

Werkzeugkavität implemented to form in this way the second mold cavity.

In a preferred embodiment, the shorter one

Cycle time allows, the first tool half 100 has two mutually identical tool cavities 200, the are arranged symmetrically to the rotation axis 110 and each complementary to the Werkzeugkavxtaten 220 and 222 of the second mold half 120.

The first tool cavity 220 of the second tool half 120 is formed with a holding mechanism in the form of the retaining pins 40 to hold the sheet reinforcing material 30 in the tool cavity 220 so as to abut against the corresponding wall of the second tool half 120. The retaining mechanism in the form of the retaining pins 40 is released by retracting the retaining pins 40.

Although the wall of the first tool cavity 220 is shown in plan in FIG. 3, this wall may also be contoured in a desired manner to accommodate the

Reinforcing material 30 in a corresponding

three-dimensional shape in the resulting

Orient plastic injection molded part.

The process for producing the plastic injection molded part with the device 1 'then comprises the steps of inserting the reinforcing material 30 into the tool cavity 220 of the second tool half 120, wherein the reinforcing material 30 by means of the retaining pins 40 adjacent to the corresponding wall of the tool cavity 220 in the second tool half 120th is held.

Then, the injection mold by pressing the first mold half 100 on the second mold half 120th

closed. The first tool half 100 has a tool cavity 200 in such a way that the first

Tool cavity 20 is formed on one side of the reinforcing material 30. Via a runner 16 in the first mold half 100, the plastic material is then injected into the mold cavity 20 such that the

Plastic material on at least one side of the

Reinforcing material 30 is applied. After this Injecting the plastic material into the first mold cavity 20, the holding mechanism is removed in the form of the retaining pins 40, so in particular the retaining pins 40 retracted. In this way, any existing defects, especially holes, in the

Plastic injection molded part, which originate from the retaining pins 40, closed by the still flowable plastic material and in particular the application of the emphasis.

In order to provide the second mold cavity 22, the first mold half 100 together with the injection molded part 3 therein, which is the planar one

Reinforcing material 30 and the applied in the first injection molding plastic material 32, implemented so that it with the second tool cavity 222 of the second

Tool half 120 matches. In particular, this is the first tool half 100 relative to the second

Tool half 120 is rotated about the axis of rotation 110, or it is implemented in a variant, the plastic injection molded part in another mold cavity.

Since the second tool cavity 222 of the second tool half 120 has a different inner shape than the first

Tool cavity 220 of the second mold half 120, between the reinforcing material 30 and the wall of the second mold cavity 222, the second mold cavity 22nd

educated. In the second mold cavity 22, a plastic material is then injected via the second sprue 18 on the other side of the reinforcing material 30 and thus the plastic injection molded part is completed accordingly.

In order to achieve a transfer or displacement of the first tool half 100 relative to the second tool half 120, the first tool half 100, if in her the

Plastic injection molded part 3 already exists, axially in

Direction of the rotation axis 110 relative to the second Tool half 120 are moved back to provide sufficient space for such rotation, as the

Plastic injection molded part 3 protrudes beyond the Werkzeugkavität 200 of the first mold half 100.

It can be clearly seen from FIG. 3 that the corresponding cavities 200 of the first tool half 100 are identical to one another, in other words, in the first embodiment

Tool half 100 only one type of cavities provided. In the second tool half 120, however, a first tool cavity 220 is for the first injection process and a second tool cavity 222 for the second injection process

intended. This is due inter alia to the fact that in the first injection process, the planar reinforcing material 30 over its entire surface on the inner wall of the corresponding

Tool cavity 220 is applied to achieve an accurate orientation and positioning of the reinforcing material 30. In the second injection, however, in the first

Injection process not yet overmolded side of

Reinforcing material 30 are provided with an arbitrary contour. Accordingly, on the first page of the

Plastic injection molded part 3 other surface features, and in particular a different outer contour, are produced than on the second side of the reinforcing material 30th

By doing the procedure in a single

Injection molding tool with two mutually displaceable or mutually rotatable tool halves 100, 120 can be performed here, a plastic injection molded part can be made efficiently and flexibly.

FIGS. 4 and 5 show a further embodiment in which a preform tool 3 'is produced in a preform tool 1 ", wherein a first tool half 100 and a second tool half 120 of the preform tool 1" are in turn provided with a holding mechanism in the form of holding pins 40 which is a flat reinforcing material 30 adjacent to a cavity inner wall of the second tool half 120, hold.

By means of the first tool half 100 is a first

Mold cavity 20 is provided in which over the first runner 16 plastic material can be injected on one side of the planar Verstarkungsraaterials 30, wherein after the injection process, the retaining pins 14th

can be withdrawn and by means of the reprinting the still liquid plastic material closes the holes generated by the retaining pins 40 or holes.

The preform thus produced is then in a

Implemented injection molding tool 1 '' ', which also includes a first mold half 100 and a second mold half 120. The produced in the preforming tool 1 ''

Preform can in turn be held in position in the injection molding tool 1 '' 'by means of retaining pins 40. In one variant, the preform may also be used for positioning

additionally or exclusively be clamped in the tool. In the injection molding tool is a second

Mold cavity 22 is formed. Via the second sprue channel 18 can then in the second mold half 120 provided by the second mold cavity 22nd

Plastic material to be injected and accordingly on the other side of the fabric mat plastic material

be applied.

In a variant, the retaining pins 14 in the

Preformwerkzeug, however, withdrawn only after the

Plastic material is already slightly hardened so that generated by the retaining pins 14 in the preform

Openings remain. These openings can then serve for the exact subsequent positioning of the preform in the injection molding tool 1 ''', wherein the retaining pins 40 of the injection molding tool 1''' can be passed through the corresponding openings. In a further variant of the method not only a planar reinforcing material is inserted into the tool cavity, but at least two. It can

different materials are used.

In a variant, the steps of holding a reinforcing material on a tool wall, the

Providing a tool cavity on the other side of the reinforcing material and injecting a

Kunststoffrnaterials repeated as often as desired in the corresponding mold cavity, so that different layers of reinforcing material and plastic material can be stacked on top of each other. In particular, while the

Distance between the reinforcing layers can be achieved by appropriate design of the respective mold cavity and each reinforcing layer can by the corresponding

Design of the tool wall, on which it is held adjacent to be provided with an individual contour.

FIG. 6 shows a plastic injection-molded part 3 which has a planar reinforcing material 30 and a one-sided arrangement of the reinforcing material

Spritzgusskunststoffläge 32, and provided on the other side of the reinforcing material

Injection molded plastic structure 34 includes.

As can be seen in Figure 6, is essential to the

Plastic injection molded part, which is produced by means of the described method that the reinforcing material 30 over its entire surface from both sides of the respective

Plastic structures 32, 34 is encircled. Furthermore, any desired wall thicknesses of the sprayed-on plastic material can be produced both on the inside of the reinforcing material 30 and on the other side of the reinforcing material 30, and in particular on both sides of the planar one Reinforcing material can be constructed any injection molding structures.

In a further embodiment, the planar

Reinforcement material 30 may be provided only in a portion of the resulting plastic injection molded part.

Different reinforcing materials may be provided. Furthermore, at least two layers of

Reinforcing material may be provided, wherein the layers of the reinforcing material may be spaced apart from each other and the individual reinforcing layers may have different contours.

In all the methods described above, the

Reinforcing material are also only partially introduced s that it is present in the resulting plastic injection molded part only i a certain area. Such a partial provision of the reinforcing material is particularly advantageous in the area around inserted screws or pins for reinforcement. It should be noted that just a reinforcing material with a smaller

Surface area as the corresponding tool wall, for example, by the provision of a holding mechanism in a defined position in the mold cavity adjacent to the tool wall can be maintained.

Claims

claims

1. A method for producing a reinforced with a sheet-like reinforcing material, in particular

fabric reinforced or nonwoven reinforced,

Plastic injection molded part (3, 3 '), comprising the steps:

Holding a flat reinforcing material (30), in particular a fabric or a non-woven mat, in a cavity of an injection mold adjacent to a

Mold;

Providing a first mold cavity (20) on one side of the sheet reinforcing material,

Injecting a plastic material into the first mold cavity;

then providing a second mold cavity (22) on the second side of the sheet reinforcing material; and

Injecting a plastic material into the second mold cavity.

2. The method according to claim 1, wherein the planar

Reinforcing material is applied to a wall of a mold core (14) of the injection molding tool and the mold core after the injection of the plastic material in the first

Tool cavity is withdrawn to form the second mold cavity.

3. The method according to claim 1 or 2, wherein the

Reinforcing material on the tool wall by means of a

Holding mechanism (40) is held and the holding mechanism is released after injection of the plastic material in the first mold cavity.

4. The method according to claim 3, wherein the holding mechanism comprises at least one retaining pin (40), which after the Injection of the plastic material is retracted into the first mold cavity.

5. The method according to claim 3 or 4, wherein the

Holding mechanism is solved as long as that in the first

Mold cavity injected plastic material is still flowable and through the holding mechanism

Leave defects in the plastic injection molded part in particular by applying a reprint in

Essentially closed.

6. The method according to claim 3 or 4, wherein the

Holding mechanism is released after that in the first

Mold cavity injected plastic material is at least partially cured,

A method according to any one of the preceding claims, wherein the reinforcing material is held by clamping between two tool halves.

S. Method according to one of the preceding claims, wherein in the first mold cavity another

Plastic material, or a plastic material of a different color is injected as in the second mold cavity.

9. A method according to any one of the preceding claims, wherein the first mold cavity and the second mold cavity are provided in the same injection mold,

in particular by retraction of a tool core and / or by assigning different tool cavities

to each other .

10. The method according to claim 1, wherein the first mold cavity is provided by positioning a first mold half (100) with respect to a second mold half (120), and the second mold cavity is in a second position of the first mold half (100). with respect to the second tool half (120).

11. The method according to any one of the preceding claims, wherein the second mold cavity is provided by reacting the plastic injection molded part produced in the first mold cavity in another Werkzeugkavität.

12. The method according to any one of the preceding claims, wherein the first mold cavity in a preforming tool (1 '') is provided and after the injection of the

Plastic material in the first mold cavity, the resulting resulting injection molded part (3 ') in a second injection molding tool {!' '} Is implemented to provide the second mold cavity.

13. The method according to claim 12, wherein the

Plastic injection molded part (3 ') from the preforming tool (1' ') in the injection molding tool (1' '') by means of a

Holding mechanism, in particular by means of retaining pins (40), is held, and the holding mechanism is released after injection of the plastic material in the second mold cavity as long as the plastic material is still flowable and in particular the defects are substantially closed by means of a reprint.

14. The method according to any one of the preceding claims, wherein the sheet-like reinforcing material in the form of a flat fabric part and / or in the form of a flat non-woven mat, which has a flexibility perpendicular to the surface normal is provided.

15. The method according to claim 1, wherein the sheet-like reinforcing material is held on a contoured wall of the tool to form a contoured shape of the sheet-like reinforcing material in the mold

To obtain plastic injection molded part.

16. The method according to any one of the preceding claims, wherein the injected into the first and / or the second mold cavity plastic material is mixed with additives, in particular with non-plastic additives such as short and / or long single fibers, glass beads, chips and / or suitable fillers is added.

17. The method according to any one of the preceding claims, wherein the sheet-like reinforcing material is contoured by the application to the tool wall in the direction of its surface normal.

18. The method according to any one of the preceding claims, wherein at least two flat reinforcing materials are used.

19. The method according to any one of the preceding claims, wherein also in the second mold cavity a second planar

Reinforcing material in the tool cavity at the

Tool wall is held adjacent and after injection of the plastic material in the second mold cavity, a third mold cavity is provided on the second side of the second sheet reinforcing material, in which a further plastic material is injected.

20. plastic injection molded part, which by means of a

Method according to one of the preceding claims.

21. Plastic injection molded part according to claim 20, wherein a planar reinforcing material (30), in particular a

Nonwoven mat or a fabric, on a first side of a plastic material (32) is enclosed and on a second side of another plastic material (34} is enclosed, wherein the plastic material at least on one side of the reinforcing material has a three-dimensional structure.

22. Plastic injection molded part according to claim 20 or 21, wherein the planar reinforcing material is provided only in a region of the plastic injection-molded part.

23. Plastic injection molded part according to one of claims 20 to 22, wherein at least two layers of reinforcing material are provided.

24. Plastic injection molded part according to claim 23, wherein at least two layers of reinforcing material a

have different contour and in particular the layers are spaced from each other differently.

25. Device for producing a

Plastic injection-molded part (3), in particular for carrying out the method according to the preceding method claims, the device comprising:

an injection molding tool having a first mold half (10, 100) and a second mold half (12, 120), wherein a Werkzeugkavität is formed so that a

Reinforcing material (30) by means of a holding mechanism (40) in the Werkzeugkavität so fitting against a wall of the cavity is that on one side of the

Reinforcing material, a first tool cavity (20} is provided;

a mechanism for providing a second

Tool cavity (22) on the other side of the

Reinforcing material (30) after a plastic material has been injected into the first mold cavity.

26. The device according to claim 25, wherein the

Injection molding tool comprises a displaceable core (14) for producing the second mold cavity

can be withdrawn.

Apparatus according to claim 25 or 26, wherein the first mold half (100) has at least one tool cavity (200) by means of which the first mold cavity (20) can be provided, and the second mold half (120) has at least two tool cavities (220, 222 )

wherein the first tool cavity (220) of the second tool half is configured such that the reinforcing material (30) can be held against a wall of the tool cavity by means of the holding mechanism (40), and the second tool cavity of the second tool half is designed such that the second tool cavity (22) can be provided, wherein the tool cavity (200) of the first tool half (100) is opposite both the first tool cavity (220) of the second tool half {120} and the second cavity (222) of the second

Tool half (120) can be positioned.

28. The device according to claim 27, wherein the first

Tool half with respect to the second mold half is rotatable so that the located in the first mold half cavity (200) relative to the first cavity (220) and the second cavity (222) of the second mold half (120) can be positioned.

29. Device according to one of claims 25 to 28, wherein only the second tool cavity (222) of the second

Tool half (120) has a runner (18}, which communicates with the second mold cavity (22).

30. The device according to claim 25, wherein a first

Preforming tool (1 '') for providing the first

Mold cavity (20) and an injection molding tool (1 '' ') are provided for producing the second mold cavity (22), wherein both the preforming tool and the

Injection molding tool comprise a holding mechanism (40} for holding the reinforcing material.