CN111775391A - Structure for embedding flexible sheet in rubber product and method thereof - Google Patents
Structure for embedding flexible sheet in rubber product and method thereof Download PDFInfo
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- CN111775391A CN111775391A CN201910274989.8A CN201910274989A CN111775391A CN 111775391 A CN111775391 A CN 111775391A CN 201910274989 A CN201910274989 A CN 201910274989A CN 111775391 A CN111775391 A CN 111775391A
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- flexible sheet
- rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
Abstract
The invention provides a structure for embedding a flexible sheet in a rubber product and a method thereof, wherein the structure comprises a positioning combination which is respectively formed on the flexible sheet and a forming die, so that the flexible sheet in the die can be relatively fixed in the die and does not move when the die is closed; the formed rubber is solidified and then is filled with other spaces except the flexible sheet and the positioning combination; the flexible sheet material is coated in the molding rubber, and a positioning combination part matched with the mold is reserved on the flexible sheet material. The invention has the significance that the flexible sheet can be coated in a rubber product under the mould pressing process, and the flexible sheet is ensured not to deform and to be positioned accurately.
Description
Technical Field
The invention relates to the field of rubber product processing, in particular to a structure and a method for embedding a flexible sheet into a rubber product.
Background
At present, rubber products are widely applied in the fields of industry, medical treatment, food and the like. Nor is one limited to the use of a single rubber material for product manufacture. In order to improve the performance of rubber products or expand the application scenes of rubber products, more and more people try to mix and process rubber and other materials. One way is to internally position the insert during rubber molding so that it can be tightly coupled to the insert during rubber molding for its intended purpose.
The existing rubber processing has three main molding modes, namely a mould pressing method, a transfer molding method and an injection method. Among them, the most widely used are the mold pressing method and the transfer molding method, in which a gel-like semi-finished product is placed in a mold, the mold is closed, then the mold is put into a high temperature furnace and pressurized, and after a while, the molding and the demolding are performed.
For the case of precisely placing and molding flexible sheets in rubber, the prior art generally uses an injection method. It is characterized by placing a flexible sheet material in a cavity mold, and then injecting the liquid rubber material into the mold through an orifice. And (4) extracting redundant air in the mould by using negative pressure in the other hole of the mould, and finally carrying out vulcanization molding and demoulding after the liquid rubber is completely filled in the whole mould.
When the rubber-coated sheet is molded by injection, the sheet needs to be manually placed before each injection, and the tooling is more complicated, so the processing cost is generally higher. However, when such a structure is formed by molding, the semi-fluid silica gel material may form a sheet under high pressure impact during molding, which may cause displacement, deformation and even damage of the sheet. However, when the injection method is used, the connection between the rubber and the sheet is not tight due to the insufficient pressure; or when multiple rubbers are injected in combination, the multiple rubbers are not tightly combined and even peeled off.
It is therefore desirable to provide a structural design method and process flow to address the problem of the inability of the flexible sheet to maintain its shape and position in the rubber during the compression molding process so that the shape and position of the flexible sheet in the rubber of the compression molding process is as desired.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a structure and a manufacturing method for realizing precise positioning of a flexible sheet in a rubber product molding process, so as to solve the above problems.
The invention provides a structure for embedding a flexible sheet into a rubber product, which comprises a positioning combination and a forming combination, wherein the positioning combination is respectively formed on the flexible sheet and a forming die, so that the flexible sheet in the die can be relatively fixed in the die and does not move when the die is closed; the formed rubber is solidified and then fills the other spaces except the flexible sheet and the positioning combination in the die cavity; the flexible sheet material is coated in the molding rubber, and a positioning combination part matched with the mold is reserved on the flexible sheet material.
Wherein, the thin and easy-to-deform part of the flexible sheet is provided with a reinforcing rib for fixing. The flexible sheet material may be first molded or coated with a layer of gel-like material to secure it.
The invention also provides a structure for embedding the flexible sheet material into the rubber product, which comprises a solid material and a flexible sheet material, wherein the solid material and the flexible sheet material are mutually matched and fixed, so that the flexible sheet material in the mold can be relatively fixed in the mold and does not move when the mold is closed, and the flexible sheet material per se also becomes a part of the structure; the formed rubber is solidified and then fills other spaces except the flexible sheet and the solid material in the die cavity; the flexible sheet material is wrapped in the molding rubber and is tightly combined with the solid material.
Wherein the solid material is another rubber which is cured in advance. The small and easily-deformed part of the flexible sheet is provided with a reinforcing rib for fixing. The flexible sheet is first molded or coated with a layer of gel-like material to secure it.
Another object of the present invention is to provide a method for forming a flexible sheet embedded in a rubber product, comprising the steps of forming positioning assemblies on a flexible sheet and a forming mold respectively, so that the flexible sheet can be fixed in the mold relatively and cannot move when the mold is closed; placing a molding rubber raw material, heating and pressurizing for molding, and filling other spaces except the flexible sheet and the positioning combination in the mold cavity after the molding rubber is cured;
wherein, the thin and easy-to-deform part of the flexible sheet is additionally provided with a reinforcing rib for fixing. The flexible sheet is first molded or coated with a layer of gel-like material to secure it.
The invention also provides a method for embedding the flexible sheet material into the rubber product, which comprises the following steps of placing a solid material to be matched and fixed with the flexible sheet material, so that the flexible sheet material can be fixed in the mould relatively and can not move when the mould is closed, and the flexible sheet material also becomes a part of the structure; placing a molding rubber raw material, heating and pressurizing for molding, and filling other spaces except the flexible sheet and the solid material in the mold cavity after the molding rubber is cured;
wherein the solid material is another rubber which is cured in advance. And the method also comprises the step of additionally arranging reinforcing ribs on the small easily-deformed part of the flexible sheet for fixing. The method also comprises the step of firstly molding or coating a layer of colloidal material on the flexible sheet material for fixing.
The invention has the significance that the flexible sheet can be coated in a rubber product under the mould pressing process, and the flexible sheet is ensured not to deform and to be positioned accurately. On the other hand, the rubber and the flexible sheet material can be better combined. In the case of co-molding of a plurality of rubbers, the bonding between each of the rubbers, and between each of the rubbers and the flexible sheet can be made tighter. The mould pressing process can effectively reduce the cost of the prior flexible sheet material for embedding and forming in rubber.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of one embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic diagram of another embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of fig. 3.
Fig. 5A and 5B are schematic diagrams illustrating a flexible sheet structure according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The solution of the invention is that a group of positioning combination is respectively formed on the flexible sheet and the forming die, so that the flexible sheet can be relatively fixed in the die without moving when the die is closed, or a rubber is formed firstly and is mutually matched and fixed with the flexible sheet on the rubber.
Referring first to fig. 1, fig. 1 is a schematic diagram of an embodiment of the invention. In fig. 1, the mold is a two-piece upper and lower mold, and includes an upper mold 5 and a lower mold 1 forming a cavity. In the cavity a flexible sheet 4 is placed. A positioning combination 3 is arranged between the flexible sheet 4 and the bottom layer mold 1. The positioning assembly 3 can be a plurality of positioning holes and positioning piles as shown in the figure, or a combination of holes and pins (round, square and special shapes), or a combination of fixing pieces and faces (the fixing pieces on the die can buckle the contour of the flexible sheet), and the upper die and the lower die clamp the flexible sheet. Of course, the positioning assembly 3 may also be disposed between the upper mold 5 and the flexible sheet 4, or the positioning assembly 3 may be disposed between the flexible sheet and both the upper and lower molds.
The rubber material 2 is laid on the bottom layer mould 1, and then the flexible sheet 4 can be accurately positioned on the bottom layer mould 1 through the positioning combination 3. And then the rubber raw materials 2 are paved and formed on the flexible sheet 4, and the upper layer of rubber raw materials and the lower layer of rubber raw materials are matched through the volume of the die cavity. And finally, covering the upper layer die 5, and putting the upper layer die into a furnace for heating and pressurizing for molding.
Referring next to fig. 2, fig. 2 is a schematic cross-sectional view of fig. 1. The structure is formed as shown in figure 2. The separately placed molded rubber 2 is integrally wrapped around the flexible sheet 4, wherein the portion of the positioning assembly 3 on the flexible sheet 4 is still connected with the bottom layer mold 1, and the molded rubber 2 is molded around the portion of the positioning assembly 3, as shown in fig. 2, the positioning assembly 3 is a convex portion of the flexible sheet 4, so that the portion is filled with the flexible sheet 4. On the contrary, if the positioning assembly 3 is a mold protrusion and the flexible sheet 4 forms a pit or a through hole, a corresponding through hole is left on the molded rubber 2 after molding.
Referring to fig. 3 again, fig. 3 is a schematic view of another embodiment of the present invention. In fig. 3, a formed rubber a7 is firstly made in another mold, the formed rubber a7 is placed in a cavity of a bottom mold 1, then a formed rubber B raw material 2 is laid, a flexible sheet 4 is relatively fixed on the bottom mold 1 through a positioning assembly 3, then a layer of formed rubber B raw material 2 is covered, and finally an upper mold 5 is covered for forming. Finally, as shown in fig. 4, the molded rubber B2 covers the flexible sheet 4 and the molded rubber a7 and is vulcanized and molded into the molded rubber B.
Reference is next made to fig. 5A and 5B, which are schematic diagrams illustrating a comparison of the structure of a flexible sheet according to yet another embodiment of the present invention. The flexible sheet 4 is in this embodiment a mouthpiece design in a medical product. This mouthpiece needs to transmit the electrical signals of the host to the plurality of distal ends of the mouthpiece, which are independent of each other and not connected. A flexible circuit board (FPC) needs to be embedded to transmit electric signals. One end of the FPC is connected with the host, and the end is connected with each tail end of the tooth socket through a plurality of wires in the FPC. Therefore, the tail ends are made of conductive silicon rubber, the tail ends are insulated by common silicon rubber, and the conductive silicon rubber and the terminals of the FPC are required to be mutually and tightly connected to realize a passage; meanwhile, the common silicon rubber and the conductive silicon rubber are required to be tightly connected, and the common silicon rubber and the flexible circuit board are required to be tightly connected.
As shown in fig. 5A, the flexible sheet 4 of the present embodiment, i.e., the FPC, is provided with four through holes at both ends, i.e., the positioning combination 3 formed with the mold. The flexible sheet 4 is however relatively slender and has several fine-branched projections which are relatively easy to displace and deform during the moulding. One solution is to redesign the fine-branched protruding portion in fig. 5A as shown in fig. 5B, and provide a reinforcing rib 8 for structural reinforcement so as to make it less likely to deform. Alternatively, the flexible sheet 4 or the fine-branched extensions thereof may be fixed by applying a layer of fixing glue thereto. Accurate positioning can also be ensured by two or more times of compression molding without being displaced.
In this embodiment, the conductive silicone rubber is molded by a mold and demolded, thereby obtaining a molded conductive silicone rubber. Then, a mould is used for forming bottom common silicon rubber, then the flexible circuit board is placed on the common silicon rubber and is matched and fixed with a point position on the mould, and position reference is carried out through the bottom silicon rubber. Then, a proper amount of raw materials (calculated according to the volume of the cavity in advance) is filled in the gap, and meanwhile, the formed conductive silicon rubber is placed on the preset position of the upper die. And finally, closing the mold, and entering a furnace for curing and molding.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (14)
1. A structure for embedding a flexible sheet in a rubber article, comprising:
the positioning combination is respectively formed on the flexible sheet and the forming die, so that the flexible sheet in the die can be relatively fixed in the die and does not move when the die is closed;
the formed rubber is solidified and then fills the other spaces except the flexible sheet and the positioning combination in the die cavity;
the flexible sheet material is coated in the molding rubber, and a positioning combination part matched with the mold is reserved on the flexible sheet material.
2. The structure of embedding flexible sheet material in rubber product as described in claim 1, wherein said flexible sheet material has smaller flexible portions fixed by reinforcing ribs.
3. A structure for embedding a flexible sheet material in a rubber product as claimed in claim 1, wherein said flexible sheet material is fixed by molding or coating a layer of a gel-like material.
4. A structure for embedding a flexible sheet material in a rubber product, characterized by comprising,
the solid material is matched and fixed with the flexible sheet material, so that the flexible sheet material in the mould can be relatively fixed in the mould and does not move when the mould is closed, and the flexible sheet material per se also becomes a part of the structure;
the formed rubber is solidified and then fills the other spaces except the flexible sheet and the solid material in the die cavity;
the flexible sheet material is wrapped in the molding rubber and is tightly combined with the solid material.
5. The structure of claim 4, wherein said solid material is another rubber that has been previously cured.
6. The structure of embedding flexible sheet material in rubber product as described in claim 4, wherein said flexible sheet material has smaller flexible portions fixed by reinforcing ribs.
7. A structure for embedding a flexible sheet material in a rubber product as claimed in claim 4, wherein said flexible sheet material is fixed by molding or coating a layer of a gel-like material.
8. A method of embedding a flexible sheet material in a rubber article, characterized by the steps of,
positioning combinations are respectively formed on the flexible sheet and the forming die, so that the flexible sheet can be relatively fixed in the die and does not move when the die is closed;
and (3) putting a forming rubber raw material, heating and pressurizing for forming, and filling other spaces except the flexible sheet and the positioning combination in the die cavity after the forming rubber is cured.
9. The method of claim 8, further comprising the step of adding reinforcing ribs to the thin flexible portion of the flexible sheet for anchoring.
10. The method of claim 8, further comprising molding or coating the flexible sheet with a gel-like material to secure the flexible sheet.
11. A method of embedding a flexible sheet material in a rubber article, characterized by the steps of,
placing a solid material, and mutually matching and fixing the solid material and the flexible sheet material, so that the flexible sheet material in the mould can be relatively fixed in the mould and does not move when the mould is closed, and the flexible sheet material also becomes a part of the structure;
and (3) putting a forming rubber raw material, heating and pressurizing for forming, and filling other spaces except the flexible sheet and the solid material in the die cavity after the forming rubber is cured.
12. A method of embedding a flexible sheet in a rubber article as defined in claim 11, wherein said solid material is another rubber which has been previously cured.
13. The method of claim 11, further comprising the step of adding reinforcing ribs to the thin flexible portion of the flexible sheet for anchoring.
14. The structure of embedding a flexible sheet material in a rubber article of claim 11, further comprising affixing said flexible sheet material by molding or coating said flexible sheet material with a gel-like material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910274989.8A CN111775391A (en) | 2019-04-04 | 2019-04-04 | Structure for embedding flexible sheet in rubber product and method thereof |
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|---|---|---|---|
| CN201910274989.8A CN111775391A (en) | 2019-04-04 | 2019-04-04 | Structure for embedding flexible sheet in rubber product and method thereof |
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| CN111775391A true CN111775391A (en) | 2020-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115027070A (en) * | 2022-06-07 | 2022-09-09 | 北京金诺美科技股份有限公司 | Auxiliary device for manufacturing temperature calibration probe and manufacturing process |
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