WO2022215089A1

WO2022215089A1 - An apparatus to manufacture complex cavity with interconnected hollow space and method thereof

Info

Publication number: WO2022215089A1
Application number: PCT/IN2022/050340
Authority: WO
Inventors: Dr. Pankajkumar Kumanbhai CHHATRALA
Original assignee: Chhatrala Dr Pankajkumar Kumanbhai
Priority date: 2021-04-07
Filing date: 2022-04-07
Publication date: 2022-10-13

Abstract

The present invention relates to an apparatus (100) to manufacture complex cavity through injection moulding process. The apparatus (100) consists of the first injection moulding mechanism (20A) and second injection moulding mechanism (20B), the hydraulic mechanism (18) and sliding assembly (3). The injection moulding mechanism injects the liquid silicon rubber to produce the complex cavity. The complex cavity is moved to the sliding assembly 3 through hydraulic mechanism (18).

Description

Title of the invention: AN APPARATUS TO MANUFACTURE COMPUEX

CAVITY WITH INTERCONNECTED HOUUOW SPACE AND METHOD THEREOF

FIEUD OF INVENTION

The present invention relates to an apparatus to produce complex cavity moulded products from silicone rubber. More particularly, the present invention relates to an apparatus to produce a complex cavity through injection moulding.

BACKGROUND OF INVENTION

The complex cavity is used to create connected channels in moulded part which is required to contain secondary material or channels which allow flow across contacted channels.

Patent No. US6261490B1, Filed by Rotec Chemicals Ltd., Dated: 15/09/1998, Discloses a method of making single layer molded article using rotational molding and having provision of filling different materials inside typically form to provide structural rigidity. In disclosed patent, thermoplastic materials prepared be used for rotational molding process, however it is not suitable for micro structure or it is difficult to control internal geometry as wall thickness highly vary and depends on various parameter like temperature, rotation etc. another limitation is that it would not be used to make elastomer article.

Patent No. EP1961398B1, Filed by Allergan Inc., Dated: 17/07/2002, Discloses making rubber articles using silicone elastomer i.e. RTV, HTV, Tin cured silicone. However, problem with this method is also same, i.e. it is difficult to control internal contours of article. As it is batch process, production process is tedious and time consuming.

Patent No. US4923666A, Filed by Cinpres Ltd, Dated: 28/04/1988, Discloses a resin moulding is produced by introducing molten synthetic thermoplastic resin into a mould cavity, sufficient to fill completely the mould cavity. Subsequently, during the cooling of the resin, pressurized gas is introduced into the resin within the mould cavity. The resin moulding cools and hardens in the mould cavity while the gas is maintained under pressure. The mould cavity is designed to manufacture mouldings with unevenly distributed thick walled sections connected to at least one gate for the introduction of the pressurized gas, which flows only within the resin forming the thick walled sections and immediately adjacent areas of the moulding thereby taking up the shrinkage in the resin.

None of the above mentioned methods and technologies lacks in one or other aspects when compared to the present invention. The present disclosure is directed to overcome one or more limitations stated above.

Thereby, the general purpose of the present invention is to provide an improved combination of convenience and utility, to include the advantages of the prior art, and to overcome the drawbacks inherent therein.

SUMMARY OF THE PRESENT INVENTION

The principal object of the present invention is to provide an apparatus to produce a complex cavity that can be filled with different materials to create a functional device i.e. provide cushioning effect, elastomeric property, rigidity, cooling, heating, etc. The apparatus consists of an injection moulding mechanism of elastomers using especially silicone rubber in various form hydraulic mechanism and sliding assembly. The apparatus injects the liquid silicon rubber to the mould through an injection moulding mechanism. The complex cavity from the moulds are conveyed to the sliding assembly through the hydraulic mechanism.

Yet another object of the present invention is to provide a heating/cooling zone to control the temperature of the complex cavity.

Another object of the present invention is to provide supporting assembly to support the hydraulic mechanism.

Still another object of the present invention is to provide the control unit to control the injection moulding operation and operate the heating/cooling zone to maintain the temperature of liquid silicon rubber complex cavity.

Another object of the present invention is to provide a complex cavity at the end of the injection moulding.

Another object of the present invention is to provide the control unit for controlling the temperature of the mould and the movement of moulds.

Another object of the present invention is to provide a nozzle for injecting moulding materials from the dosing tank to the mould cavity. Another object of the present invention is to provide a static mixer which is used to mix the liquid silicone materials from the different tanks before injection of the materials into the injection moulding mechanism.

Another object of the present invention is to provide a zipping arrangement to allow the patient to wear the complex cavity on the fractured part of the body.

Another object of the present invention is to provide a dosing tank or container for storing the liquid silicon rubber materials. The liquid silicone rubber materials injects from dosing tank for injection moulding.

Another object of the present invention is to provide a liquid silicone rubber as a pasting materials for joining the layers of complex cavity.

The present invention relates to the apparatus to produce a complex cavity through the injection moulding process. The complex cavity is conveyed to the sliding assembly through the hydraulic mechanism. The temperature of the complex cavity is controlled through a heating/cooling zone.

The present invention relates to the method to produce complex cavity through injection moulding process. The sliding bed is at the home position, and then insert part (i.e. zip) will be put on the second mould cavity. The sliding bed slides on the horizontal rod from the home position to the injection position and comes under the first mould for the first layer of the complex cavity. Simultaneously, the sliding assembly slides from the injection position to the second position and comes under the second mould for the second layer of the complex cavity. The first mould and the second mould are initially hot. The First Part of the first mould connects with the bottom cavity part of the first mould through the vertical movement of the hydraulic mechanism.

Similarly, the second part connects with the second mould for the second layer of the complex cavity through the vertical movement of the hydraulic mechanism. The Liquid silicone rubber injects into the first injection moulding mechanism from the dosing unit and then liquid materials is injected inside the first mould and the second mould through the respective injection moulding mechanism. At the end first part and second part disconnect from the first mould and second mould respectively. The second mould now becomes cold through the coolant and when the second mould is cooled down the pasting materials which is also liquid silicone rubber applied to the second layer of the cavity. After that, the sliding assembly move from the second position to the merge position where the First part which has the first layer of cavity starts to connect with the second mould which has the second layer of the cavity with the help of the sliding assembly. After that again heating of the second mould and first part is started and with the help of the heating process, the first layer and second layer of the cavity join with each other and get the finished product that is the complex cavity. The temperature of the mould and movement of the mould is controlled by the control unit.

BRIEF DESCRIPTION OF DRAWINGS

The advantages and features of the present aeration apparatus will become better understood with reference to the following more detailed description taken in conjunction with the accompanying drawings in which:

Fig. 1 illustrates perspective view of the present invention, Fig. 2 illustrates the perspective view of the first injection moulding mechanism of the present invention,

Fig. 3 illustrates the perspective view of the second injection moulding mechanism of the present invention,

Fig. 4 illustrates the sliding assembly of the present invention, Fig. 5 illustrates perspective view of the present invention with the dosing unit, Fig. 6 illustrates the first dosing unit of the present invention, Fig. 7 illustrates the second dosing unit of the present invention, Fig. 8 illustrates cross-sectional view of the present invention, Fig. 9 illustrates the home position and all moulds are hot at the home position of the present invention,

Fig. 10 illustrates the first position of the present invention and mould position during injection,

Fig. 11 illustrates the second position of the present invention and initiation production of a layer of the complex cavity, Fig. 12 illustrates the merged position of the present invention and moulds are in merging position for connecting the layers of the complex cavity,

Fig. 13 illustrates the finished position of the present invention and moulds in separated position, Fig. 14 illustrates the cross sectional view of the first injection moulding mechanism,

Fig. 15 illustrates the heating and cold plate for arranging the temperature of the moulds.

Like reference numerals and names refer to like parts throughout the several views of the drawings. DETAILED DESCRIPTION OF THE INVENTION

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. Reference herein to “one embodiment” or “another embodiment” means that a particular feature, structure, or characteristics described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in a specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Further, the diagrams representing one or more embodiments of the invention do not inherently indicate any particular order nor imply any limitations in the invention.

As used herein, the term “plurality" refers to the presence of more than one of the referenced item and the terms “a”, “an”, and “at least” do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components, but does not prelude the presence or addition of one or more other features, integers, steps, components or groups thereof. The term ‘servo motor’ is interchangeably used to show presence of the ‘electric motor’ in the following description, and relates to essentially the same subject matter.

In one of the preferred embodiment, base structure 1 supports apparatus 100. The base structure 1 supports the first injection moulding mechanism 20A and the second injection moulding mechanism 20B, hydraulic mechanism 18 and sliding assembly 3.

In one of the preferred embodiments, the hosepipe 2 conveys liquid silicon rubber to the first injection moulding 20A and the second injection moulding mechanism 20B from dosing tank

15.

In one of the preferred embodiments, the first injection moulding mechanism 20A consists of first mould 4 and the second injection moulding mechanism 20B consists of second mould 5.

In one of the embodiments, the control unit 60 is provided to control the injection moulding operation and operate the heating or cooling zone to maintain the temperature of the liquid silicone rubber complex cavity.

In one of the embodiments, the first static mixer 70A and second static mixer 70B are used to mix the liquid silicone materials from the different tanks before injection of the materials into the injection moulding mechanism.

In one of the preferred embodiments, the complex cavity is produced in two stages through injection moulding.

In one of the preferred embodiments, the zipping arrangement is provided to wear the complex cavity on the fractured body part of the patient.

As shown in Figure 1 of the present invention, it relates to the perspective view of the apparatus 100 to produce a complex cavity. Apparatus 100 comprises injection moulding mechanism 2, hydraulic mechanism 18 and sliding assembly 3. The complex cavity is produced through first injection moulding mechanism 20A, and second injection moulding mechanism 20B. The complex cavity is produced in two stages, the first mould 4 mounts with the first injection moulding mechanism 20A and the second mould 5 mounts with the second injection moulding mechanism 20B. The sliding assembly 3 is used to move first mould 4 and second mould 5 horizontally. The apparatus 100 for the production of the complex cavity through injection moulding. The complex cavity is produced through the injection moulding process. The complex cavity produced through the injection moulding process is conveyed to the sliding assembly 3 through hydraulic mechanism 18. The drag chain 19 consists to accommodate the pipelines for hydraulic pipelines 34 and for cooling. First platen 61A comprises the plurality of first hydraulic cylinders 24A and 24B and first materials cylinder 23 and second platen 61B are comprises the plurality of second hydraulic cylinders 50A and 50B and second materials cylinder 51.

As shown in Figure 2 and Figure 3 of the present invention, it relates to the perspective view of injection moulding mechanisms 20A and 20B. The liquid silicone rubber is conveyed to the first injection moulding mechanism 20A and second injection moulding mechanism 20B from dosing tank 15 through hosepipe 2. The injection moulding mechanism 20A, 20B injects the liquid silicone rubber in the first mould 4 and second mould 5 to produce the complex cavity. The first platen 61A comprises the plurality of first hydraulic cylinders 24A and 24B and first materials cylinder 23. The second platen 61B comprises the plurality of second hydraulic cylinders 50A and 50B and second materials cylinder 51.

As shown in Figure 4 of the present invention, it relates to the sliding assembly 3. The sliding assembly 3 comprises sliding bed 9, horizontal rod 10 and support plate 11. The sliding bed 9 slides on the horizontal rod 10 from the home position 41 to the first position 42 and comes under the first mould 4 for the first layer 6 of the complex cavity. The sliding assembly 3 slides from first position 41 to second position 42 and comes under the second mould 5 for the second layer 7 of the complex cavity.

Figure 5 shows the that the liquid silicone rubber materials injects into the mould of the first injection moulding mechanism 20A from the dosing tank 15A and dosing tank 15B and the second injection moulding mechanism 20B from dosing tank 15C and dosing tank 15C. The liquid silicon rubber materials is stored into the dosing tank 15 and then transport to the injection mould through hose pipe 2. The hose pipe 2 conveys the liquid materials from dosing tanks 15A, 15B to the mould of the first injection moulding mechanism 20A and The hose pipe 2 conveys the liquid materials from dosing tanks 15C, 15D to the mould of the second injection moulding mechanism 20B. The linear sensor 68 is used for the measurement of the sliding bed 9.

By referring to Figure 6 it discloses first dosing unit 30A for storing and transporting the liquid silicone rubber materialss. The first dosing unit 30A comprises a dosing tank 15A and second dosing tank 15B, dosing support assembly 26A, the plurality of driving motor 27A, supporting members 28A, 28B and pneumatic cylinder 29A. The dosing unit 30A comprises the two dosing tanks 15A and 15B, wherein the dosing tanks 15A, and 15B having the liquid silicone materials and the liquid silicone materials suck from the individual dosing tank and supplied to the first injection moulding mechanism 20A through hose pipe 2. The liquid silicone materials is transported from the dosing tank through hose pipe 2 the pneumatic cylinder 29A provides constant pressure on the dosing tanks 15A,15B and driving motor 27A is used to help the liquid materials suck and transport the materials through hosepipe 2.

By referring to Figure 7 it discloses second dosing unit 30B for storing and transporting the liquid silicone rubber materials. The dosing unit 30B comprises the two dosing tanks 15C and 15D, wherein the dosing tanks 15C and 15D having the liquid silicone materials and the liquid silicone materials suck from the individual dosing tank and supplied to the first injection moulding mechanism 20B through hose pipe 2 the pneumatic cylinder 29B provides constant pressure on the dosing tanks 15C, 15D and driving motor 27B is used to help the liquid materials suck and transport the materials through hosepipe 2.

Figure 8 shows the cross-sectional view of apparatus 100. The servo motor 32 is used to operate the hydraulic mechanism 18. The linear position sensors 31A and 31B are used to measure the linear position of the hydraulic cylinder and as a result to control the quantity of the liquid materials inside the materials cylinder through the control unit 60. The first linear position sensors 31A to measure the speed and linear position of the plurality of the first hydraulic cylinders 24A and 24B which is to measure the quantity of the materials inside the first materials cylinder 23. the second linear position 31B are used to measure the speed and linear position of the plurality of the second hydraulic cylinders 50A and 50B which is used to measure the quantity of the materials inside the second materials cylinder 51. The servo motor 32, hydraulic block 33 and the hydraulic pipelines 34, the structural member 35 housed by the base structure 1.

Wherein, Fig. 9 to 13 shows the method of the present invention for producing the complex cavity. The sliding bed 9 is at the home position 41 as shown in figure 8, and the insert part (i.e. zip) will be put on the second mould cavity 5. The sliding bed 9 slides on the horizontal rod 10 from the home position 41 to the injection position 42 and comes under the first mould 4 for the first layer 6 of the complex cavity.

Simultaneously, when the sliding assembly 3 slides from the home position 41 to injection position 42, the first mould 4 and second mould 5 are aligned with each other. The first mould 4 and the second mould 5 are initially hot. the First Part 53 of the first mould 4 connects with the bottom cavity part of the first mould 4 through the vertical movement of the hydraulic mechanism 18 similarly second part 55 connects with the second mould 5 for the second layer 7 of the complex cavity through the vertical movement of the hydraulic mechanism 18. The Liquid silicone rubber injects into the first injection moulding mechanism 20A and the second injection moulding mechanism 20B from the dosing unit 30 and then liquid materials is injected inside the first mould 4 and the second mould 5 through the first injection moulding mechanism 20A and the second injection moulding mechanism 20B. the first part 53 and second part 55 disconnect from the first mould 4 and second mould 5 respectively at a second position 43, The second mould 5 now becomes cold through the coolant and when the second mould 5 is cooled down the pasting materials which is also liquid silicone rubber applied to the second layer 7 of the cavity.

After that, the sliding assembly 3 moves from second position 43 to the merge position 44 where the first part 53 which has a first layer 6 of the cavity starts to connect with the second mould 5 which has the second layer 7 of the cavity with the help of the sliding assembly 3. After that again heating of the second mould 5 and first part 53 is started at finished position 45 and with the help of the heating process, the first layer 6 and second layer 7 of the cavity join with each other and get the finished product that is the complex cavity.

Figure 14 and Figure 15 show the cross-sectional view of the first injection moulding mechanism 20A. The liquid silicone rubber materials injects through the hose pipe 2 to the mould cavity. Then as shown in figure 14, the injected materials is set in the mould and as per the requirement the temperature of moulds are heated and cooled down through hot and cold plates attached to the moulds the liquid silicone materials is supplied from the dosing tank 15A, 15B separately and then before injection of the materials the liquid silicone materials is mixed through the first static mixer 70A and then the mixed liquid materials is injected into the first injection moulding mechanism 20 A. Similarly, the liquid silicone materials is supplied from the dosing tank 15C, 15D separately and then before injection of the materials the liquid silicone materials is mixed through the second static mixer 70B and then the mixed liquid materials is injected into the first injection moulding mechanism 20B. The nozzle 65A is provided for injecting moulding materials from the dosing tanks 15A and 15B to the mould cavity. The nozzle 65B is provided for injecting moulding materials from the dosing tanks 15C, 15D to the mould cavity. The injected materials for manufacturing the complex cavity from the injection moulding is selected from, but not limited to, liquid silicone materials as injection materials.

Although a particular exemplary embodiment of the invention has been disclosed in detail for illustrative purposes, it will be recognized by those skilled in the art that variations or modifications of the disclosed invention, including the rearrangement in the configurations of the parts, changes in steps and their sequences may be possible. Accordingly, the invention is intended to embrace all such alternatives, modifications and variations as may fall within the spirit and scope of the present invention.

The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching.

Claims

CLAIMS: We Claim,

1. An apparatus 100 to manufacture complex cavity with interconnected hollow space and method thereof characterized by: a) at least one injection moulding mechanism having at least one injection mould with a hydraulic mechanism connected to at least one dosing unit having at least one dosing tank, to supply liquid materials to the mould of injection moulding mechanism through a hose pipe, wherein the mould is moved from the injection moulding mechanism to the sliding assembly through a hydraulic mechanism; and injected liquid materials in the mould is heated or cooled through hot and cold plates attached to the mould; wherein a sliding assembly is used to move the mould horizontally; b) a first injection moulding mechanism 20A and a second injection moulding mechanism 20B, wherein the first injection moulding mechanism 20A having the first mould 4 and the second injection moulding mechanism 20B having the second mould 5; c) a sliding assembly 3 comprises the sliding bed 9 slides on the horizontal rod 10 from the first mould 4 to the second mould 5, wherein the sliding assembly is supported by a support assembly 11; d) a hydraulic mechanism 18 for hydraulic pressure and moved the layers of the cavity from the first injection moulding mechanism 20A and the second injection moulding mechanism 20B to the sliding assembly 3; e) a dosing unit 30A having a dosing tank 15A,15B, wherein a liquid materials is conveyed to the first injection moulding mechanism 20A from dosing tank 15A,15B through hosepipe 2; a dosing unit 30B having a dosing tank 15C, 15D, wherein a liquid materials is conveyed to the second injection moulding mechanism 20B from dosing tank 15C,15D through hosepipe 2; f) a control unit 60 controls the injection moulding operation and operate the heating or cooling zone to maintain the temperature of the liquid materials.

2. The apparatus 100 as claimed in claim- 1, wherein the base structure 1 supports the first injection moulding mechanism 20A, the second injection moulding mechanism 20B, the sliding assembly 3 and the hydraulic mechanism 18.

3. The apparatus 100 as claimed in claim-2, wherein the servo motor 32, the hydraulic block 33, the hydraulic pipelines 34 and the structural member 35 are housed in the base structure 1.

4. The apparatus 100 as claimed in claim-2, wherein the drag chain 19 is used to accommodate the hydraulic pipelines 34 and pipelines for cooling.

5. The apparatus 100 as claimed in claim- 1, wherein the first injection moulding mechanism 20A comprises a first platen 61A and the second injection moulding mechanism 20B comprises a second platen 61B.

6. The apparatus 100 as claimed in claim-5, wherein the first platen 61A comprises the plurality of first hydraulic cylinders 24A and 24B and the first materials cylinder 23.

7. The apparatus 100 as claimed in claim-5, wherein the second platen 61B comprises the plurality of second hydraulic cylinders 50A and 50B and the second materials cylinder 51.

8. The apparatus 100 as claimed in claim- 1, wherein the liquid materials is silicone rubber is used for injection materials.

9. The apparatus 100 as claimed in claim- 1, wherein the servo motor 32 is used to operate the hydraulic mechanism 18.

10. The apparatus 100 as claimed in claim- 1, wherein the first linear position sensors 31A to measure the speed and linear position of the plurality of the first hydraulic cylinder 24A and 24B.

11. The apparatus 100 as claimed in claim- 1, wherein the second linear position 31B are used to measure the linear position of the plurality of second hydraulic cylinders 50A and 50B.

12. The apparatus 100 as claimed in claim- 1, wherein the first dosing unit 30A and second dosing tank 30B for storing and transporting the liquid silicone rubber materials.

13. The apparatus 100 as claimed in claim- 1, wherein the dosing unit 30A comprises a dosing tank 15A, dosing support assembly 26A, the plurality of driving motor 27A, supporting members 28A, 28B and pneumatic cylinder 29A, wherein the pneumatic cylinder 29A is used to provide pressure in the dosing tank 15 for suck the required liquid materials from the dosing tank 15 and the liquid materials transfer through the hose pipe 2 by driving motor 27A.

14. The apparatus 100 as claimed in claim- 1, wherein the dosing unit 30B comprises a dosing tank 15B, dosing support assembly 26B, the plurality of driving motor 27B, supporting members 28C, 28D and pneumatic cylinder 29B, wherein the pneumatic cylinder 29B is used to provide pressure in the dosing tank 15C, 15D for suck the required liquid materials from the dosing tank 15C, 15D and the liquid materials transfer through the hose pipe 2 by driving motor 27B.

15. The apparatus 100 as claimed in claim- 1, wherein the liquid silicone materials is supplied from the dosing tank 15A, 15B separately and then before injection of the materials the liquid silicone materials is mixed through the static mixer 70A and then the mixed liquid materials is injected into the first injection moulding mechanism 20 A.

16. The apparatus 100 as claimed in claim- 1, wherein the liquid silicone materials is supplied from the dosing tank 15C, 15D separately and then before injection of the materials the liquid silicone materials is mixed through the static mixer 70B and then the mixed liquid materials is injected into the first injection moulding mechanism 20B.

17. The method for producing the complex cavity comprises the following steps: a) a sliding bed 9 is at the home position 41 and the insert part put on the second mould cavity 5; b) a sliding bed 9 slides on the horizontal rod 10 from the home position 41 to the injection position 42 and comes under the first mould 4 for the first layer 6 of the complex cavity; c) a sliding assembly 3 slides from the home position 41 to injection position 42, the first mould 4 and second mould 5 are aligned with each other, wherein the first mould 4 and the second mould 5 are initially hot; d) a first part 53 connects with the bottom cavity part of the first mould 4 through the vertical movement of the hydraulic mechanism 18 and a second part 55 connects with the second mould 5 for the second layer 7 of the complex cavity through the vertical movement of the hydraulic mechanism 18; e) a liquid materials injects into the first mould 4 and the second mould 5 through the first injection moulding mechanism 20A and the second injection moulding mechanism 20B; f) a first part 53 and second part 55 disconnect from the first mould 4 and second mould 5 respectively at a second position 43; g) a second mould 5 becomes cold through the coolant and the pasting materials is applied to the second layer 7 of the cavity; h) a sliding assembly 3 moves from second position 43 to the merge position 44 where the first part 53 which has a first layer 6 of cavity starts to connect with the second mould 5 which has the second layer 7 of the cavity with the help of the sliding assembly 3; i) a second mould 5 and first part 53 get heated at finished position 45 and the first layer 6 and second layer 7 of the cavity join with each other.

18. The method for producing the complex cavity comprises claimed in claim- 17, wherein the zip is inserted in the cavity of the second mould 5, the zipping arrangement is provided to wear the complex cavity on the fractured body part of the patient.

19. The method for producing the complex cavity comprises claimed in claim- 17, wherein the injected materials is set in the first mould 4 and in the second mould 5, as per the requirement the temperature of moulds are heated and cooled down through hot and cold plates.

20. The method for producing the complex cavity comprises claimed in claim- 17, wherein the liquid silicone rubber materials is used as a pasting materials.

21. The method for producing the complex cavity comprises claimed in claim- 17, wherein the pasting materials is used for joining the first layer 6 and the second layer 7 of the complex cavity.

22. The method for producing the complex cavity comprises claimed in claim- 17, wherein the first layer 6 of the complex cavity is made by the first mould 4 and the first part 53 of the first injection moulding mechanism 20A.

23. The method for producing the complex cavity comprises claimed in claim- 17, wherein the second layer 7 of the complex cavity is made by the second mould 5 and the second part 55 of the second injection moulding mechanism 20B.

24. The method for producing the complex cavity comprises claimed in claim- 17, wherein the sliding bed 9 slides on the horizontal rod 10 from the home position 41 to the first position 42 and comes under the first mould 4 for the first layer 6 of the complex cavity.

25. The method for producing the complex cavity comprises claimed in claim- 17, wherein the sliding assembly 3 slides from the first position 41 to second position 42 and comes under the second mould 5 for the second layer 7 of the complex cavity.