DE10153491A1 - Injection molding process for plastics components, comprises placing insert in mold using guide, centering it using block and injecting plastic - Google Patents

Abstract

A process for injection molding plastic components comprises placing an insert in a mold before injection molding takes place and injecting around it during the molding process. The insert is guided into the mold chamber, and contours (44,46,48) are applied, which are located along a separation plane (15) between the mold sections. A process for injection molding plastic components comprises placing an insert in a mold before injection molding takes place and injecting around it during the molding process. The insert is guided into the mold chamber, and contours (44,46,48) are applied, which are located along a separation plane (15) between the mold sections. A side section is located on the sealing section that faces away from the insert section, and an elastomer is injected into it. The insert section is centered on a block. The arrangement used to mold the component consists of a mold, an insert block and a handling system.

Description

The invention relates to a method for injection molding Plastic articles in which an on before the injection molding process place part in a cavity of a tool of a plastic Injection molding machine inserted and the insert during injection casting process is at least partially encapsulated.  

The invention further relates to a device for spraying pour plastic items, with at least one hollow tool containing space and with an arrangement for insertion an insert in the cavity before the injection molding process, comprising the first means for feeding the insert, wherein the insert during the injection molding process at least partially is injected.

A method and an apparatus of the aforementioned type are known.

In plastic injection molding, it is known before the injection pouring process so-called inserts into the cavity of the plant stuff of the plastic injection molding machine or, at a more specialist tool, a corresponding number of inserts in insert the multiple cavities of the tool. The inlay parts can serve a wide variety of purposes. That's the way it is known, inserts for mechanical reinforcement of art to inject fabric articles. For other plastic items become electrical or electronic assemblies in art injected fabric article. But it is also known to be inlay parts only partially overmolded, so that from the finished Protruding sections of the insert part mechanical or electrical purposes can be used.

So-called blades are used in certain wet shavers heads used. These blade heads are on a holder of the Wet razors stored, mostly movably, and can after a certain number of shaves against a new one Blade head to be replaced if the blades are blunt have been.  

In these essentially flat, rectangular blade heads is one more on the right and one on the left or less solid plastic injection molded cheek. Several extend parallel between these two cheeks blades arranged one above the other and at a distance from one another, which are attached to the cheeks with their free ends are. For reasons of stability it is above and below the Each sound an art that connects the two cheeks provided beam, which in technical terms as "soap strip" or is called "Finguard".

In some conventional blade heads, the aforementioned ones Plastic parts by injection molding as a common one lumpy structure made. In this structure the Blades then inserted loosely and then using a me fixed metallic clamp. However, this process is complicated graces and takes a long time.

Now it would be conceivable to have such blade heads similar to others produce known plastic parts in which the insertion parts inserted into the cavity and then during the injection process partially overmolded. But then it is during the Injection molding process necessary, the not to be overmolded to keep the cut of the insert so tight in the tool, d. H. to cover that this section does not match the injected liquid plastic comes into contact. This is a very difficult matter because the liquid plastic at As is well known, injection molding into the cavity under very high pressure is injected so that even with the smallest gaps between the section of the insert to be covered and the opposite complementary wall of the cavity  desired plastic on this section to be covered can. Especially in the mentioned application with blade heads for wet shavers this is particularly disadvantageous because of the art unwanted on the blade area form a kind of film and thus the blade edge Can take sharpness.

The invention is therefore based on the object of a method a device, a blade head and a use of the type mentioned in such a way that the before mentioned disadvantages can be avoided. In particular, should can be achieved with the invention that the not to overmold the sections of the insert precisely and thus under high Tightness in the complementarily shaped section of the Cavity are inserted so that this section of the Einle partly with a high degree of certainty not in contact with the molded plastic comes.

In the case of a method of the type mentioned at the beginning, this solved according to the invention in that the insert Tool supplied and then by means of part of the tool is inserted into the cavity under the guidance of the tool.

In a device of the type mentioned in the opening solved according to the invention in that second, in the plant Constructed means for taking over the insert from the first means and provided for insertion into the cavity are.

It is namely the first time in the context of the present invention has been known that the problems mentioned in the we  are largely due to the fact that the inserts not inserted into the cavity with the necessary precision become. So the problem is contrary to general expectations not that the complementary section of the Cavity is not sufficiently precise complementary to the outer contour the inserts are or the inserts are not sufficient are true to form. Rather, plastic injection molding succeeds process common in conventional procedures even then not if the insert and the complementary Section of the cavity for the Ab not to be molded cut of the insert are precisely paired with each other.

The lack of precision when inserting the inserts is based on Er obtained in the context of the present invention essentially know that the loading process is over from a handling system - and only from this hand lingsystem - running from the side between moved apart halves of the tool and then the insert is moved first to the cavity, whereupon then the insert by means of ejector pins or the like Chen is transferred into the cavity. This insertion or via therefore, the delivery process cannot be carried out at the required high level Precision run because of the handling system itself relatively long distances and usually also along several axes relative to the also movable tool halves moved. This has the consequence that during the transfer process from the handling system into the cavity not a sufficiently precise rela tive positioning of the cavity on the one hand and the transfer point of the handling system on the other hand can. These problems can be solved by centering the handling  systems on the tool, as is known from DE 199 49 851 A1 is known, do not solve in principle.

In practice, this means that the insert is not precise se is inserted in the place in the cavity where it is to be removed covering section of the insert part flush with the complementary Would create surface of the cavity. Rather, the one often placed in one or both of the traversing axes around one minimal path offset, so that column arise through the plastic in an undesirable manner in the Area of the section of the insert to be covered.

It has therefore been recognized in the context of the present invention that that one can basically solve this problem in that the last section of the loading process is no longer by hand lingsystem but rather from a separate arrangement is carried out as a tool part in turn on the tool is stored. This arrangement, which is designed as an insert block can be receives the inserts, for example via ent speaking lead-in chamfers, centers them and transfers them then in the centered state exactly at the position in which the contours of the insert part and the cavity On the other hand, lay the wall flush.

In preferred developments of the invention is only part overmould the insert the cavity with a he most contours that complement a second contour of the insert at the portion not to be overmolded is formed, the contours in the injection molding process be put together or lie next to each other.  

This measure has the advantage that the exact centering or Alignment of the insert in the tool in conjunction with the con Doors can be exploited to gain access to plastic to exclude in the covered area with certainty.

In a preferred development of this embodiment are the contours along a parting plane between halves of the Tool only in some areas in at least one seal section provided.

This opens up the possibility of further training the Er between two sealing sections provide section in which the insert is completed lies in such a way that the insert section is free during injection of plastic remains.

The aforementioned measures have the advantage that the Abdich with their exact requirements for the shape accuracy of the Contours and to the positioning accuracy of the insert only in certain, for example, narrow zones, namely the you tion sections, must be ensured while on the from injected state facing away from the seal section or between two such sealing sections the insert can be more or less exposed and there no further sealing functions are required.

In this case it is further preferred if on the insert section facing away from the sealing sections one side section is provided in the free ends of the insert protrude, with the side portion when injecting Plastic is injected.  

This measure has the advantage that reliable fixation the inserts is made possible because these with their free Ends in the area of the side section z. B. cheek-shaped Sections of the plastic article are injected.

In the above variant of the invention, it is fer ner advantageously possible that at least in the Sei a non-dimensionally stable plastic is injected an elastomer, for example.

As already stated above, it is in the state of the Technology known, inserts initially loose in the finished ge injection molded plastic items and then in a sepa advise to fix the process mechanically. This procedure he however, it requires the use of a dimensionally stable plastic because the above-described joining process only takes place on a dimensionally stable Plastic is possible. But this means that the inlay parts are rigidly attached to the plastic article.

According to the last mentioned procedure according to the present However, the invention can also be a non-dimensionally stable art Use material to encapsulate the free ends of the insert detected because the inserts are already fixed in the tool are and therefore no joining forces on those in the side areas injection molded section of the plastic article.

Then when the inserts on the finished plastic article they are injected with a non-dimensionally stable plastic spring-loaded, which for many applications, in particular with wet shaving heads, is an advantage.  

In embodiments of the invention is particularly imminent pulls when the insert part of the tool by means of a handling systems is supplied or the first funds as handling system are trained.

These measures have the advantage of being faster and auto automated production process can be achieved.

In the context of the present invention, it is particularly preferred if the insert is an insert block that can be stored in the tool is supplied or the second means as in the tool warehouse bar insert block are formed.

These measures have the advantage that a relatively small element stored in the tool, the handover or Takeover of the insert in an advanced position of the Insert blocks are made and this is then carried along with the insert partially retracted into the tool around the insert to position precisely there.

Within the scope of the present invention, two variants are provided:
In the first variant, the insert block is always in the tool and takes over the insert part, for example from a handling system, while it is in the tool.
This procedure is advantageous when it comes to relatively manageable tools with only one or very few cavities and a total of only a few insertion parts to be inserted.
In the case of complicated arrangements, so-called multiple tools, which may have dozens of cavities, into which several insert parts may have to be inserted, a second procedure is preferred.
In this second procedure, a plurality of insert blocks are used, these insert blocks being designed as interchangeable parts. These exchangeable blocks can then be fitted in an external circulation system, with a total of 96 inserts having to be inserted in the case of a multiple tool with 32 cavities and three inserts to be inserted. Since this insertion process takes some time, the external circulation system would also act as a buffer. The interchangeable blocks are then z. B. used by means of a handling system in the tool, namely in their local guidance on the tool.
Overall, this measure would have the advantage, given the complicated boundary conditions mentioned, that the time-consuming insertion process on the insert block takes place outside the injection molding machine and therefore the cycle time of the injection molding machine itself can be kept short.

In any case, it is preferred if the insert block is inserted section of the tool is guided.

It has already been mentioned that the inevitable is inaccurate speed when positioning the feeder, i.e. at example of the handling system, thereby being compensated, that the inserts during the transfer, for example from  Handling system in the insert block, centered or aligned tet, d. H. be positioned exactly.

This centering preferably takes place only outside the seal section instead of because conventional centering means, such as insertion bevels and the like, in the region of the sealing section are undesirable because they bil access for the plastic that would.

In a preferred embodiment of the invention the tool points in at least two directions along a ge common first axis movable tool halves, and the cavity is in the disintegrated closed the tool halves were accessible. So it can be tools with two tool halves or so-called Trade stack tools with three or more tool halves.

The first means, ie in particular a, are further preferred Handling system, ent when the tool halves have moved apart long one essentially perpendicular to the first axis fenden second axis movable between the tool halves.

It is particularly preferred if the insert in the direction the first axis from the first means to the second means is transferable.

In this case, a particularly good effect is achieved if the second means along a tour in a plant half of the tool can be moved along the first axis.  

This measure has the advantage that the second funds, at for example the insert block, the retracted handling system so to speak "drive towards" and take over the insert to then return to the mold half Ren. The insert is then finished on this return path centered and precise to the intended location in the cavity spent.

Further advantages result from the description and the at added drawing.

It is understood that the above and the following standing features to be explained not only in each specified combination, but also in other combinations or can be used alone, without the scope of to leave the present invention.

An embodiment of the invention is in the drawing shown and is described in more detail in the following description explained. Show it:

FIG. 1 is a plan view of an embodiment of a used within the scope of the present invention a plastic injection molding tool with two tool halves, shown in the extended state;

Fig. 2 is a sectional view taken along the line II-II of Fig. 1;

Fig. 3 is a sectional view taken along the line III-III of Fig. 1;

Fig. 4 is a sectional view taken along the line IV-IV of Fig. 1;

Fig. 5 is an illustration, similar to Figure 1, but on a somewhat enlarged scale and only with one tool half, which is opposite a handling system in a starting position, in a first operating position.

Fig. 6 is a sectional view taken along the line VI-VI of Fig. 5;

FIG. 7 shows an illustration, similar to FIG. 5, but in a second operating position;

Fig. 8 is a sectional view taken along the line VIII-VIII of Fig. 7;

FIG. 9 shows a further illustration, similar to FIG. 5, but in a third operating position;

Fig. 10 is a sectional view taken along the line XX of Fig. 9;

FIG. 11 shows a further illustration, similar to FIG. 5, but in a fourth operating position;

Fig. 12 is a sectional view taken along the line XII-XII of Fig. 11;

FIG. 13 is a further view similar to Figure 5, but in a fifth operating position.

Fig. 14 is a sectional view taken along the line XIV-XIV of Fig. 13;

FIG. 15 is a sectional view similar to Figure 14 but in a sixth operative position.

FIG. 16 shows a further sectional illustration, similar to FIG. 14, but in a seventh operating position;

FIG. 17 is a sectional view, in the plane II-II of FIG. 1, but with the tool closed;

Fig. 18 is a sectional view, similar to Fig. 17, but in the plane III-III of Fig. 1; and

Fig. 19 is another view similar to FIG. 17, but in the plane IV-IV of FIG. 1,.

In Fig. 1, 10 denotes a tool of a plastic injection molding machine. The tool 10 has a first tool half 12 and a second tool half 14 which lie against one another along a common parting plane 15 in the closed state. The two tool halves 12 and 14 can be moved relative to one another along a common axis 16 , the so-called Z axis. It is understood that this arrangement is to be understood only as an example and that other tool types, in particular so-called stack tools, can be used within the scope of the present invention.

Figs. 1 to 4 show the tool 10 in the open state in which the tool halves 12 are moved apart fourteenth In a second axis 18 , the so-called X-axis, which runs perpendicular to the first axis 16 , a handling system can now move into the space between the two tool halves 12 , 14 in order to remove finished plastic articles or to insert an insert for a subsequent injection molding process. This will be explained in more detail below.

The first tool half 12 has side cheeks 20 , between which there is an insert block 22 . The insert block 22 is mounted with a precision guide 24 in the first tool half 12 , in the direction of the first axis 16 . In Fig. 1 with 24 a the horizontal part and in Fig. 4 with 24 b the vertical part of the precision guide 24 is indicated. Since it is to be expressed with that the insert block 22 is stored and guided precisely in the vertical and horizontal directions in the most tool half 12 .

The tool halves 12 , 14 are provided with a complex-shaped cavity, which is formed by numerous cavity sections and projections, in order to produce a plastic article with a complex shape, into which an insert part is also to be injected, but only partially. A typical example of such a plastic article is a so-called blade head for wet shavers. In these blades heads one or more blades are held between two side cheeks made of plastic, the blades being exposed over the major part of their length so that shaving cream and cut whiskers can get through between the blades. A parallel to the blades at a distance from these ver running and the two cheeks connecting bracket, which can also be arranged on both sides (so-called. "Soapstrip" and "Fin guard"), gives the blade head the necessary stability. The blade head itself can in turn be articulated in a hand-held Hal ter of the wet shaver.

With these plastic items it is important that they do not overmolding sections of the inserts, d. H. in the above Example the cutting edges of the razor blades, never select Coming into contact with plastic during the injection molding process because otherwise the sharpness of the cutting edges would be lost.

In the tool 10 shown in Fig. 1, both tool halves 12 and 14 are provided with a plurality of Hohlraumabschnit th 26 and 28 to 37 , some of which have insertion slopes, as indicated at 27. In a corresponding manner, projections 38 to 42 are also provided, which are located in the cavity sections. The shape of this cavity or the cavity sections and the associated protrusions depends on the shape of the plastic article to be manufactured in each case, as can also be seen from FIGS. 2 to 4.

In Fig. 1, three sections are drawn on the first tool half 12 along the common parting plane 15 . In the middle there is an insertion section Y symmetrical to the z-axis 16.

At these borders on both sides narrower sealing sections X, which in turn are laterally delimited by side sections W. The meaning of these sections Y, X and W is as follows:
In the middle insertion section Y, the clinches to be inserted should remain free of injected plastic, because this is the area of the blade head to be produced, which later forms the shaving area.
In order to prevent the penetration of injected plastic into the insertion area Y, the processing section X is provided on both sides, which must be made correspondingly tight. The inserted blades run through the sealing section X.
In the laterally delimiting side sections W, the lateral cheeks of the blade head are formed, into which the free ends of the blades are to be injected.

Figs. 2, 3 and 4 are sectional views along the Lini en II-II, III-III and IV-IV of FIG. 1. They, therefore, the side portion W (Fig. 2), the sealing portion X (Fig. 3 ) or the insertion section Y ( Fig. 4).

In Fig. 1 it is seen that to be produced by ejecting the cavities 26 and 33 in the region of the side portions W cheeks of the blade head.

From Fig. 3 it can be seen that when the tool is closed, the projection 41 enters the cavity 28 , so that in the closed state above the projection 41, only the partial cavity remaining in the cavity 28 remains together with the cavity 34 . This total cavity forms the transition to the so-called "soap strip".

The same applies to the lower area, in which in the closed state of the tool on the left side of the cavity 29 and on the right side of the lower part of the cavity 35 remains and there forms the transition to the "finguard".

FIG. 4 shows the insertion section Y. There, the “soap strip” is formed by the cavity 30 and the upper region of the cavity 36 , and the “finguard” by the cavities 32 and 37 . The area in between, in which the blades are located, is hermetically sealed, namely upwards by the projection 39 , which engages in a recess 43 in the cavity 36 on the right, and downwards by the projection 42 , which on the left in enters the cavity 31 . This means that the Klin gene are in this intermediate area within a cavity (see. Fig. 17 below), but this cavity is closed on all sides, so that access to liquid plastic is not possible.

With 44 , 46 and 48 three so-called sealing contours are designated net. This is understood to mean the contours of cavity or jump sections of the tool halves 12 , 14 , which are complementarily adapted to non-extrusion-coated surface sections of an insert part 50 . As will be shown (see FIG. 19), these sealing contours 44 , 46 , 48 are selected so that the sections of the inserts in question are completely sealed when the tool 10 is closed, that is to say under no circumstances are they in contact with the injected plastic can reach.

It has already been said that the insert 50 in the illustrated embodiment is a blade holder for the blade head of a wet shaver mentioned above.

In the exemplary embodiment shown, two blade holders 50 a, 50 b are used for one blade head, that is to say they are inserted into the tool 10 in pairs.

Each blade holder 50 has a holding part 52 in which a blade 54 is located. The holding part 52 has a shoulder 56 on which a slider can engage in order to move the blade holder 50 , as will be shown.

Fig. 5 shows on the left side of the first tool half 12 and on the right side a handling system 60 which was laterally retracted in the direction of the second axis 18 in the position shown.

The handling system 60 has a carrier 62 in which a slide 64 is mounted. The slider 64 has in the Dar position according to FIG. 5 above and below a respective pair of plungers 66 a, 66 b, 66 c, 66 d, as is also in the sectional illustration according to FIG. 6 is obtained. The plunger 66 a- 66 d run at its front free end in the region of the jaws 68 a, 68 b, 68 c, 68 d, between which the two lateral ends of the blade holder 50 a, 50 b are resiliently held.

The carrier 62 is delimited on its left side in FIGS. 5 and 6 by a front edge 70 . This leading edge 70, two cheeks 72 to the left, in which the jaws 68 a- 68 d are located. There is therefore sufficient space between the cheeks 72 to hold the blade holders 50 a, 50 b there.

In Fig. 6 can be seen in the area of the right end of the insert block 22 two slots 74 a and 74 b with insertion bevels, which are in the position shown of the handling system 60 with the Hal parts 52 a, 52 b of the blade holder 50 a, 50 b , as indicated at 76 .

The illustration in Fig. 5 and 6 denotes a first operating position Be, namely a starting position, in which the hand ling system 60 just laterally (second axis 18) is retracted.

In a second operating position, the insert block 22 now moves to the right in its precision guide 24 , as indicated by an arrow 78 in FIGS. 7 and 8. So that runs in front of the side 80 of the insert block 22 to the right.

It should be mentioned at this point that all of the following not necessarily sequenced movements described tially must run, as this is for the sake of clarity following is described. Rather, some of the movements also parallel in time or at least in part this temporal overlap run, as the expert using the description will recognize.  

In FIGS. 9 and 10 is now made illustrates a third operating position. In this operating position, the handling system 60 is moved to the left along the first axis 16 , as indicated by an arrow 82 . The travel path is dimensioned such that at the end of the travel path the front side 80 of the insert block 22 is just opposite an opposite front side 84 of the carrier 62 or the holding part 52 .

FIGS. 11 and 12 now show the following fourth operation position in which the slide 64 runs ahead to the left as indicated by an arrow 86. The plunger 66 a- 66 d engage thereby to paragraphs 56 of the support members 52 and push the holding parts 52 of the jaws 68 out into the slots 74 of the insert block 22. This can be done completely during this phase, ie up to the stop at the bottom of the slots 74 or initially only partially. In any case, in this third operating position according to FIGS. 11 and 12, the front 80 of the insert block 22 is still in the pre-moved position.

The Figs. 13 and 14 now show a fifth operating position in which the one part of the insert block 22 to the left again moves back, as indicated with an arrow 88, on the other hand, the slider 64, so to speak "tracks", as indicated by a further arrow 90. In this way it is achieved that the blade holder 50 at the latest in this phase at both ends, that is to say in the X direction, held and moved together with the insert block 22 to the left into the first tool half 12 . At the end of this process, the blade holder 50 has reached its precise end position in the first tool half 12 .

Fig. 15 now shows in a sixth operating position that the slide 64 returns to the right with the carrier 62 remaining stationary (arrow 91 ).

Fig. 16 shows in a seventh operating position that the slide 64 moves back all the way to the right and also the handling system 60 moves away to the right from the first tool half 12 , with the starting position (first operating position) according to FIG. 6 again being reached at the end of this process is and the handling system 60 along the second axis 18 can be moved out of the inter mediate space between the two tool halves 12 and 14 .

The tool halves 12 and 14 will now ren towards each other, so that in the three cutting planes according to FIGS . 17, 18 and 19, which correspond to the axes II-II, III-III and IV-IV of Fig. 1, the conditions shown there.

It can be seen that now, as a whole, the cavities already explained above, in which the plastic sections of the blade head are injection molded, which are necessary since to accommodate the blade holder 50 and over the length of the blade head are required to stabilize it.

Important the representation is in the present context of FIG. 18, the blade holder 50 shows the sealing portion X, in which the blade sol be completely free of plastic len.

This is achieved in the present case therefore particularly well because the sealing contours 44, 46 and 48 due to the precise positio discrimination of the blade holder as close to each other insert in the first tool half 12 50 that no gap remains, could penetrate into the the liquid plastic material during injection.

From the above description of the embodiment follows that the positional inaccuracy when feeding the clin gene holder 50 is compensated for only by the fact that the blade holder 50 is inserted exclusively within the insert section Y and exclusively on the insert block 22 and is thus centered and aligned. This takes place at the slots 74 with a corresponding insertion bevel, as can be seen in particular from FIGS . 10 and 12.

The blade holders 50 then have a precise position relative to the insert block 22 . If the insert block 22 then transfers the blade holder 50 into the cavity, the blade holder lies ex act so that when the tool is closed, the sealing contours 44 , 46 and 48 of the sealing section X are realized in the region of the sealing contours. No centering takes place in the sealing section X itself.

In a variant of the embodiment described above for example, which is particularly useful for multi-tools a large number of cavities in the same tool the corresponding several insert blocks are formed. This Swap blocks are fed to an external circulation system and equipped outside the injection molding machine. At z. B. 32 hollow clearing with three blades each are for  insert a total of 96 blades each injection molding what requires some time.

This assembly time can be compensated for in the external circulation system be used, which serves as a buffer.

In this case, the interchangeable blocks are corresponding appropriate handling system into the cavities of the tool sets, as in principle already for the insertion process the blades have been described above.

In some applications it is preferred if a plastic is injected, the special properties in terms of items to be inserted.

In the case of blade heads for wet shavers according to the invention z. B. provided at least the side wall towards the blade head into which the free ends of the blades are injection molded from a non-dimensionally stable plastic preferably an elastomer.

Either the entire blade head can be made of one Elastomer exist or only the area of the side cheeks.

This would result in the blades becoming elastic on both ends Are, which makes the shaving comfort when using the blades head would be improved.

Claims (39)

1. A method for injection molding plastic articles, in which an insert is inserted into a cavity ( 26 , 28-36 ) of a tool ( 12 , 14 ) of a plastic injection molding machine before the injection molding process and the insert is at least partially extrusion-coated during the injection molding process, thereby ge indicates that the insert leads to the tool ( 12 , 14 ) and is then inserted into the cavity ( 26 , 28-36 ) by means of part of the tool ( 12 , 14 ) under guide ( 24 ) on the tool ( 12 ). 2. The method according to claim 1, characterized in that for only partially encapsulating the insert the cavity ( 28-36 ) is provided with a first contour ( 44 , 48 ) which is complementary to a second contour ( 46 ) of the insert on the latter not to be molded section, wherein the contours ( 44-48 ) are flush against each other during the injection molding process. 3. The method according to claim 1 or 2, characterized in that the contours ( 44 , 46 , 48 ) along a parting plane ( 15 ) between halves of the tool ( 12 , 14 ) are only be provided in at least one sealing section (X). 4. The method according to claim 3, characterized in that two sealing sections (X) between them an insert Include section (Y) in which the insert is removed  closed is such that when injecting the Einle section remains free of plastic. 5. The method according to claim 4, characterized in that on the side of the insert facing away from the insertion section (Y) Sealing sections (X) a side section (W) pre will see into the free ends of the insert protrude, and that the side portion (W) when injecting is sprayed out with plastic. 6. The method according to claim 5, characterized in that at least in the side section (W) a non-form stable plastic is injected. 7. The method according to claim 6, characterized in that the plastic is an elastomer. 8. The method according to one or more of claims 1 to 7, characterized in that the insert part of the tool ( 12 , 14 ) is fed by means of a handling system ( 60 ). 9. The method according to one or more of claims 1 to 8, characterized in that the insert is supplied to an insert block ( 22 ) which can be stored in the tool ( 12 ). 10. The method according to claim 9, characterized in that the insertion part is supplied to the insertion block (22) when the insert block (22) det befin in the tool (12). 11. The method according to claim 8 and 10, characterized in that the insert is fed to the insert block ( 22 ) by means of the handling system ( 60 ). 12. The method according to claim 9, characterized in that the insertion part is supplied to the insertion block (22) when the insert block (22) outside the tool (12, 14). 13. The method according to claim 12, characterized in that a plurality of insert blocks outside the tool populated and the populated insert blocks one after the other individually or with several cavities in the tool groups alternately fed to the tool. 14. The method according to claim 4 and one or more of claims 9 to 13, characterized in that the insert block ( 22 ) in the insert section (Y) on the tool ( 12 ) leads GE. 15. The method according to one or more of claims 1 to 14, characterized in that the insert is centered when leading to the tool ( 12 ). 16. The method according to claim 3 and 15, characterized in that the insert only outside the sealing section (X) is centered. 17. The method according to claim 9 and 16, characterized in that the insert is centered on the insert block ( 22 ). 18. Device for injection molding plastic articles, with at least one cavity ( 26 , 28-36 ) containing the tool ( 12 ) and with an arrangement for inserting an insert into the cavity ( 26 , 28-36 ) before the injection molding process ( 12 , 14 ), which comprises first means for feeding the insert, the insert being at least partially encapsulated during the injection molding process, characterized in that second means ( 24 ) guided in the tool ( 12 ) for receiving the insert from the first means and for inserting it are provided - in the cavity (36 28). 19. The apparatus according to claim 18, characterized in that for only partially encapsulating the insert the cavity ( 26 , 28-36 ) with a first contour ( 44 , 48 ) is seen ver, which is complementary to a second contour ( 46 ) of the Insert part of which is not designed to encapsulate and that the contours ( 44-48 ) lie flush against one another during the injection molding process. 20. The apparatus according to claim 19, characterized in that the contours ( 44 , 46 , 48 ) along a parting plane ( 15 ) between halves of the tool ( 12 , 14 ) are only partially provided in at least one sealing section (X). 21. The apparatus according to claim 20, characterized in that two sealing sections (X) between them an insert Include section (Y) in which the insert is removed closed is such that when injecting the Einle section remains free of plastic.   22. The apparatus according to claim 21, characterized in that on the side of the insert facing away from the insertion section (Y) Sealing sections (X) a side section (W) pre can be seen in the free ends of the insert protrude, and that the side portion (W) when injecting can be sprayed out with plastic. 23. The device according to claim 22, characterized in that at least in the side section (W) a non-form stable plastic is injectable. 24. The device according to claim 23, characterized in that the plastic is an elastomer. 25. The apparatus of claim 23 or 24, characterized in that the first means are designed as a handling system ( 60 ). 26. The device according to one or more of claims 18 to 25, characterized in that the second means are designed as an insert block ( 22 ) which can be stored in the tool ( 12 ). 27. The apparatus according to claim 26, characterized in that the insert part of the insert block ( 22 ) can be fed when the insert block ( 22 ) is in the tool ( 12 ). 28. The apparatus of claim 25 and 27, characterized in that the insert part of the insert block ( 22 ) by means of the handling system ( 60 ) can be fed. 29. The device according to claim 26, characterized in that the insert part of the insert block ( 22 ) can be fed when the insert block ( 22 ) is outside the tool ( 12 , 14 ). 30. The device according to claim 29, characterized in that a plurality of insert blocks as interchangeable parts is that means for loading the inserts outside the tool and means for feeding the be Pieced insert blocks for the tool alternately one after the other that individually or with several cavities in the tool are provided in groups. 31. The device according to claim 21 and one or more of claims 26 to 30, characterized in that the insert block ( 22 ) in the insert section (Y) on the tool ( 12 ) is guided. 32. Device according to one or more of claims 18 to 26, characterized in that the tool ( 12 , 14 ) is provided with centering means. 33. Apparatus according to claim 20 and 32, characterized net that the centering means only outside the seal section (X) are provided. 34. Apparatus according to claim 26 and 33, characterized in that the centering means on the insert block ( 22 ) are easily seen. 35. Device according to one or more of claims 18 to 34, characterized in that the tool has at least two tool halves ( 12 , 14 ) which can be moved relative to one another along a common first axis ( 16 ), and in that the cavity ( 26 , 28-36 ) is accessible when the tool halves ( 12 , 14 ) are in a disassembled state. 36. Apparatus according to claim 35, characterized in that the first means when the tool halves are moved apart ( 12 , 14 ) along a substantially perpendicular to the first axis ( 16 ) extending second axis ( 18 ) between the tool halves ( 12 , 14 ) are. 37. Apparatus according to claim 36, characterized in that the insert part can be transferred from the first means to the second means in the direction of the first axis ( 16 ). 38. Apparatus according to claim 37, characterized in that the second means along a guide ( 24 ) in a tool half ( 12 ) can be moved along the first axis. 39. Apparatus according to claim 37 or 38, characterized in that the first means have a slider ( 65 ) acting in the direction of the he most axis ( 16 ).