CN112440429B - Injection molding method of flexible film with stimulating electrode - Google Patents
Injection molding method of flexible film with stimulating electrode Download PDFInfo
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- CN112440429B CN112440429B CN201910793899.XA CN201910793899A CN112440429B CN 112440429 B CN112440429 B CN 112440429B CN 201910793899 A CN201910793899 A CN 201910793899A CN 112440429 B CN112440429 B CN 112440429B
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- flexible film
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- injection molding
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
Abstract
The disclosure relates to an injection molding method of a flexible film with a stimulation electrode, which is characterized in that: the method comprises the following steps: a placement step of preparing an upper mold having a first groove and a lower mold fitted to the upper mold, and placing a flexible film having a stimulation electrode in the lower mold, wherein the first groove is provided with a boss having a predetermined curvature and protruding from a bottom of the first groove, and the lower mold is provided with an injection port for supplying an injection molding material; a mold closing step of closing the upper mold and the lower mold to form a mold cavity; a positioning step of injecting a plastic injection raw material into the mold cavity through the injection port to float and attach the flexible film to the boss; and a molding step of holding the upper mold and the lower mold and curing the injection molding material by heat treatment of the upper mold and the lower mold. According to the present disclosure, it is possible to provide an injection molding method that facilitates positioning of a flexible film in a mold and molding into a flexible film having a stimulation electrode with a specific shape.
Description
Technical Field
The disclosure relates to the field of injection molding, and in particular relates to an injection molding method of a flexible film with a stimulation electrode.
Background
In the field of medical devices, silicone injection molding of many sensing or structural components is required to meet biocompatibility. For example, for implantable medical devices, stimulation components having stimulation electrodes are often provided, wherein the stimulation electrode area needs to stimulate the implanted site and thus needs to be exposed, and the stimulation component is injection molded into a specific shape according to the requirements of the use environment.
In the conventional injection molding of the stimulation part, a stimulation part having a stimulation electrode prepared in advance is loaded in a mold, and then a liquid silicone material is injected, and the liquid silicone is solidified in combination with the stimulation part, thereby being injection molded into a product having a specific shape. In order to form the stimulation component into a specific shape, it is generally necessary to pre-bond or adhere the stimulation electrode area to the inner surface of the mold cavity to avoid being covered by the liquid silicone gel, while forming the specific shape after curing.
However, in the above-mentioned prior art, if the stimulating electrode region is previously adhered to the inner surface of the mold, the surface of the stimulating electrode needs to be coated with an adhesive, and the stimulating electrode needs to be separated from the mold after insert molding, which is likely to cause tearing or falling off of the stimulating electrode, thereby affecting the usability thereof. The stimulation electrode area is fixed by adopting an adsorption mode, and the size setting of the adsorption hole and the control of the vacuum adsorption force are difficult points.
Disclosure of Invention
The present disclosure has been made in view of the above-mentioned state of the art, and an object thereof is to provide an injection molding method of a flexible film having a stimulation electrode, which can be easily positioned and formed into a specific shape.
To this end, the present disclosure provides a method of injection molding a flexible film having a stimulation electrode, comprising: a placement step of preparing an upper mold having a first groove and a lower mold fitted to the upper mold, and placing a flexible film having a stimulation electrode in the lower mold, wherein the first groove is provided with a projection having a predetermined curvature and projecting from a bottom of the first groove, and the lower mold is provided with an injection port for supplying an injection molding material; a mold closing step of closing the upper mold and the lower mold to form a mold cavity; a positioning step of injecting a molding material into the cavity through the injection port to float the flexible film and attach the film to the boss; and a molding step of holding the upper mold and the lower mold, and curing and molding the injection molding material by heat-treating the upper mold and the lower mold.
In the present disclosure, the flexible film is disposed in a cavity formed by the upper mold and the lower mold, and the injection molding material is injected into the cavity, in which case the flexible film can be floated by the buoyancy of the injection molding material and attached to the boss, and then the upper mold and the lower mold are held and heat-treated. Therefore, the injection molding raw material can be coated on the other parts of the flexible film, which are not adhered with the bosses.
In the injection molding method provided by the present disclosure, optionally, in the positioning step, the flexible film is closely attached to the boss by filling the cavity with the injection raw material. In this case, the portion of the flexible film that is attached to the boss can be prevented from being covered with the molding material, and the other portion of the flexible film can be sufficiently covered with the molding material.
In the injection molding method provided by the present disclosure, the flexible film may include a stimulation portion having a stimulation electrode and a connection portion electrically connected to the stimulation portion, and in the positioning step, the stimulation portion of the flexible film may be floated and attached to the boss. In this case, the stimulation portion having the stimulation electrode may be connected to the connection portion, and the injection molding material may be coated on the stimulation portion.
In the injection molding method provided by the present disclosure, optionally, in the mold clamping process, a gap between the boss and the lower mold is larger than a thickness of the flexible film. This enables the flexible film to be better covered.
In the injection molding method provided by the present disclosure, optionally, the flexible film has a functional region including a stimulation electrode and a non-functional region, and the functional region is covered by the protrusion in the positioning process. In this case, the functional region of the flexible film can be left uncovered by the injection molding material, whereby the functional region of the flexible film can better fulfill its function.
In the injection molding method provided by the present disclosure, optionally, the non-functional region of the flexible film has a gap with the bottom of the first groove, and the injection molding material covers the gap in the positioning process. This enables the non-functional regions of the flexible film to be adequately coated with the casting compound.
In the injection molding method provided by the present disclosure, optionally, in the molding step, the flexible film is molded into a curved surface shape having the predetermined curvature. This makes it possible to adapt the flexible film to different process requirements.
In the injection molding method provided by the present disclosure, optionally, at the lower mold, a plurality of the injection ports are provided, and the flexible film covers the plurality of the injection ports. In this case, the molding material can be introduced into the cavity from the lower mold, whereby the flexible film can be floated by the buoyancy of the molding material.
In the injection molding method provided by the present disclosure, optionally, at the lower mold, a second groove for configuring the flexible film is provided. Thereby enabling the flexible film to be disposed in the lower mold.
In the injection molding method provided by the present disclosure, optionally, a bottom of the second groove has a protrusion shape having the prescribed curvature. In this case, the flexible film can be cured to different shapes, thereby making it possible to adapt the flexible film to different process requirements better.
According to the present disclosure, it is possible to provide an injection molding method of a flexible film having a stimulation electrode, which can be conveniently positioned and formed in a specific shape.
Drawings
Fig. 1 is a schematic flow chart illustrating an injection molding method according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram showing a structure of a mold after clamping according to the embodiment of the present disclosure.
Fig. 3 is a schematic view showing a structure of a separated mold according to an embodiment of the present disclosure.
Fig. 4 is a partial schematic view illustrating the second groove shown in fig. 3.
Fig. 5 is a schematic view showing an application of the injection molding method according to the embodiment of the present disclosure.
Fig. 6 is a partial schematic view of the mold cavity shown in fig. 5.
Fig. 7 is a schematic sectional view showing the mold in fig. 5 after clamping and injecting the injection material according to the embodiment of the present disclosure.
Fig. 8 is a schematic cross-sectional view illustrating a mold when a flexible film according to an embodiment of the present disclosure is positioned on a ledge.
Description of the symbols of the drawings:
1 … mould, 10 … upper mould, 10a … first butt surface, 11 … first groove, 11a … bottom, 12 … boss, 20 … lower mould, 20a … second butt surface, 21 … second groove, 21a … bottom, 22 … supporting mechanism, 110 … injection channel, 110a1,110a2 … sub-channel, 110a … injection hole, 111,112 111,112 … injection port, 30 … flexible film, 30a … upper surface, 30b … upper surface, 310 … stimulation part, 311 … functional region, 320 … connecting part, 321 … through hole, 40 … mould cavity.
Detailed Description
Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
In addition, the headings and the like referred to in the following description of the present disclosure are not intended to limit the content or scope of the present disclosure, but merely serve as a reminder for reading. Such a subtitle should neither be understood as a content for segmenting an article, nor should the content under the subtitle be limited to only the scope of the subtitle.
The injection molding method according to the present disclosure is an injection molding method of a flexible film having a stimulation electrode (hereinafter also simply referred to as "injection molding method"). In the injection molding method according to the present disclosure, the flexible film having the stimulation electrode is placed in a mold, and the injection material is injected into the mold so that the flexible film floats up in the mold due to the buoyancy of the injection material and adheres to the mold to form a shape having a predetermined curvature, and then the mold is subjected to heat treatment to perform injection molding on the flexible film. Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
In the present disclosure, the flexible film may be applied in the field of medical devices, for example, the flexible film may be applied to a retinal electrical stimulator, which may include an implanted portion and an extracorporeal portion. The flexible membrane may be applied to an implanted portion of a retinal electrical stimulator. The flexible membrane may be a flexible membrane having a stimulating electrode by which the retina may be stimulated. It is therefore desirable to injection mold flexible films to meet biocompatibility. The flexible film may be shaped to a particular shape and the stimulation electrodes on the flexible film are not covered.
The injection molding method according to the present disclosure is particularly suitable for injection molded objects having flexibility such as flexible films. The injection object is placed in a mold, and an injection material is injected into the mold so that the injection object floats up in the mold due to the buoyancy of the injection material and adheres to the mold to form a shape having a predetermined curvature, and then the mold is heat-treated to perform injection molding on the injection object.
Fig. 1 is a schematic flow chart illustrating an injection molding method according to an embodiment of the present disclosure.
In the present embodiment, as shown in fig. 1, the injection molding method may include the steps of: a placement step of preparing an upper mold 10 having a first groove 11 and a lower mold 20 fitted to the upper mold 10, and placing a flexible film 30 having a stimulation electrode in the lower mold 20, wherein the first groove 11 is provided with a boss 12 having a predetermined curvature and protruding from a bottom 11a of the first groove 11, and the lower mold 20 is provided with an injection port for supplying an injection material (step S10); a mold clamping step of clamping the upper mold 10 and the lower mold 20 to form the cavity 40 (step S20); a positioning step of injecting a molding material into the cavity 40 through the injection port to float the flexible film 30 and attach the film to the boss 12 (step S30); and a molding step of holding the upper mold 10 and the lower mold 20 and curing and molding the injection material by heat-treating the upper mold 10 and the lower mold 20 (step S40).
In step S10, as described above, the upper mold 10 having the first groove 11 and the lower mold 20 mated with the upper mold 10 may be prepared, and the flexible film 30 having the stimulation electrode may be disposed in the lower mold 20, wherein the first groove 11 is provided with the boss 12 (see fig. 3) protruding from the bottom 11a of the first groove 11 and having a prescribed curvature, and the lower mold 20 is provided with the injection port (in the present embodiment, the injection port 111 and the injection port 112, see fig. 7) that provides the injection molding material.
Fig. 2 is a schematic diagram showing a structure of a mold after clamping according to an embodiment of the present disclosure. Fig. 3 is a schematic view showing a structure of a separated mold according to an embodiment of the present disclosure. Fig. 4 is a partial schematic view illustrating the second groove shown in fig. 3.
In some examples, as shown in fig. 2, the upper mold 10 and the lower mold 20 may be assembled to form the mold 1, that is, in step S10, the mold 1 including the upper mold 10 and the lower mold 20 may be used. In some examples, the upper mold 10 may be mated with the lower mold 20, e.g., secured together by bolting.
In the present embodiment, the outer shape of the mold 1 is not particularly limited, and may be, for example, a rectangular parallelepiped, a cylindrical body, a square body, or an irregular three-dimensional structure.
In some examples, the upper mold 10 has a first butting surface 10a, and the lower mold 20 has a second butting surface 20a that butts against the first butting surface 10 a. In other words, the first butting surface 10a of the upper die 10 and the second butting surface 20a of the lower die 20 can be butted to assemble the die 1.
In some examples, as shown in fig. 3, at the first abutting surface 10a, a first groove 11 may be formed. In some examples, the first groove 11 may have a bottom 11 a.
In some examples, as shown in fig. 3, at the first abutting surface 10a, a first groove 11 may be formed. In some examples, the shape of the bottom 11a of the first groove 11 is not particularly limited. For example, the bottom 11a of the first groove 11 may have a flat shape, an arc shape, or the like.
In some examples, the flexible film 30 may have an upper surface 30a and a lower surface 30 b. Wherein the upper surface 30a may face the upper mold 10 and the lower surface 30b may face the lower mold 20. In some examples, stimulation electrodes as described above may be disposed on the upper surface 30a of the flexible film 30, and the functional regions 311 (e.g., stimulation electrode regions) are formed on the upper surface 30 a. In some examples, the first recess 11 may not be provided with the projection 12, in which case the stimulation electrode area may directly engage the bottom 11a of the first recess 11.
In some examples, the first groove 11 may have a bottom 11a with a prescribed curvature. In some examples, in the above-described positioning process, the flexible film 30 may be attached to the bottom 11a of the first groove 11, thereby enabling the side of the flexible film 30 attached to the bottom 11a of the first groove 11 to be formed into a curved surface having the same curvature as the bottom 11a of the first groove 11.
In some examples, the first groove 11 may be provided with a boss 12 protruding from a bottom 11a of the first groove 11. In this case, in the positioning step, the flexible film 30 can be attached to the boss 12 while being lifted, and thus the portion of the flexible film 30 attached to the boss 12 can be prevented from being covered with the casting material.
In some examples, the boss 12 may have an upper surface 12a with a prescribed curvature. In some examples, the upper surface 12a of the boss 12 is concave. This enables the portion of the flexible film 30 bonded to the boss 12 to be formed into a curved surface having the same curvature as the upper surface 12a of the boss 12. In some examples, the curvature of the upper surface 12a of the boss 12 may be the same as the curvature of the bottom 11a of the first groove 11.
In some examples, as shown in fig. 3 and 4, at the second abutting surface 20a, a second groove 21 may be formed. In some examples, the second groove 21 may have a bottom 21 a. In some examples, the shape of the bottom 21a of the second groove 21 is not particularly limited. For example, the bottom 21a of the second groove 21 may be flat or curved.
In some examples, the bottom 21a of the second groove 21 may have a protrusion shape having a predetermined curvature, and in this case, a side of the flexible film 30 facing the bottom 21a of the second groove 21 may be coated with the injection molding material in the molding process, thereby being molded into a curved surface shape having the same curvature as the bottom 21a of the second groove 21. In some examples, the predetermined curvature may match the curvature of the bottom 11a of the first groove 11, thereby enabling the flexible film 30 to be formed into a curved shape in which the curvature of the injection-molded product covering the upper surface 30a is the same as the curvature of the injection-molded product covering the lower surface 30 b. In some examples, in the molding process (step S40, described later), the flexible film 30 may be molded into a curved shape having a prescribed curvature. This enables the flexible film 30 to be molded into a molded article having a specific shape.
Fig. 5 is a schematic view showing an application of the injection molding method according to the embodiment of the present disclosure. Fig. 6 is a partial schematic view of the mold cavity shown in fig. 5. Fig. 7 is a schematic sectional view showing the mold in fig. 5 after clamping and injecting the injection material according to the embodiment of the present disclosure.
In some examples, the second groove 21 may be used to arrange the flexible film 30, for example, as shown in fig. 5, the flexible film 30 may be arranged in the second groove 21 of the lower mold 20 in the direction of arrow a in fig. 5. Thereby enabling the flexible film 30 to be disposed in the lower mold 20. In some examples, the flexible film 30 may be disposed in the lower mold 20 in a direction parallel to the second butting surface 20a of the lower mold 20.
In some examples, as shown in fig. 5-7, the flexible membrane 30 may include a connection portion 320 having a stimulation portion 310 and connected to the stimulation portion 310. In some examples, the connection portion 320 may be electrically connected with the stimulation portion 310, and the stimulation portion 310 may have a functional region 311. In some examples, functional region 311 may have stimulation electrodes. In this case, the stimulation part 310 having the stimulation electrode may be connected to the connection part 320. In some examples, the functional region 311 may be located on the upper surface 30a of the flexible film 30. In some examples, the side of the flexible film 30 having the functional region 311 (i.e., the upper surface 30a) may face the upper mold 10 during the mold clamping process.
In some examples, as shown in fig. 5, the flexible film 30 may be sheet-like. In some examples, the flexible membrane 30 may be other regular blocks, spheres, or irregular random shapes. In some examples, the size of the flexible film 30 may match the size of the second recess 21. For example, the size of the flexible film 30 may be smaller than the size of the second recess 21. Thereby enabling the flexible film 30 to be conveniently disposed in the second recess 21.
In some examples, the material of the flexible film 30 may be selected to be flexible. Thereby facilitating the flexible film 30 to be fitted to the mold 1 and formed into various shapes (described later). In some examples, the flexible film 30 may be composed of a flexible insulating material. In this case, the electrical interference of the flexible film with other devices can be effectively reduced. In some examples, the flexible film 30 may be composed of at least one selected from polyimide, polydimethylsiloxane, and poly-p-xylylene chloride. This makes it possible to obtain a flexible film 30 with good biocompatibility, which is better suited for use in the field of medical devices.
In some examples, the lower mold 20 may be provided with an injection port. In some examples, the injection molding material may be injected into the lower mold 20 (e.g., the second groove 21) through an injection port. For example, as shown in fig. 7, injection ports (e.g., injection port 111 and injection port 112) may be provided at the bottom 21a of the second groove 21.
In step S20, as described above, the upper mold 10 and the lower mold 20 may be clamped to form the cavity 40. In some examples, mold cavity 40 may include a cavity portion 41 and an extension 42 in communication with cavity portion 41. In this case, the cavity portion 41 and the extension portion 42 together form the cavity 40 of the mold 1. In addition, in some examples, the above-described boss 12 may be formed at the cavity portion 41.
In some examples, as shown in fig. 5 to 7, in step S20, the flexible film 30 may be disposed in the lower mold 20, the upper mold 10 and the lower mold 20 may be clamped in the direction indicated by the arrow a in fig. 5, and the mold cavity 40 may be formed. In some instances, the mold cavity 40 is sealed except in connection with the injection port, in which case the molding material injected into the mold cavity 40 does not flow out of the mold cavity 40.
As described above, after the upper mold 10 and the lower mold 20 can be assembled to form the mold 1, the first recess 11 and the second recess 21 can be combined to form the mold cavity 40. In some examples, the shape and size of mold cavity 40 may be determined by the shape and size of first recess 11 and second recess 21. In some examples, the injection molding compound may cover the edges of the flexible film 30. For example, the edges of the flexible film 30 may have a gap with the mold cavity 40. In some examples, the gap between the boss 12 and the lower mold 20 may be greater than the thickness of the flexible film 30. In this case, the flexible film 30 can be better coated with the injection molding material in the presence of the bosses 12. In this case, during the injection of the injection molding material to the flexible film 30, the injection molding material covers the edge of the upper surface 30a in addition to the lower surface 30b of the flexible film 30, whereby the edge of the flexible film 30 is covered with the injection molding material.
In some examples, when the flexible film 30 including the stimulation portion 310 having the stimulation electrode and the connection portion 320 connected to the stimulation portion 310 is placed in the cavity 40 of the mold 1, the stimulation portion 310 may be disposed at the cavity portion 41 and the connection portion 320 may be disposed at the extension portion 42. In injection molding of the flexible film 30 of the cavity 40, the connection portions 320 of the flexible film 30 are supported and fixed (described later) by the support mechanisms 22 (for example, a plurality of) respectively provided at the first groove 11 and the second groove 21, and the stimulation portions 310 of the flexible film 30 are attached and positioned to the upper mold 10 by the injection raw material, whereby the flexible film 30 can be molded into an injection molded article of a specific shape.
Fig. 8 is a schematic cross-sectional view illustrating a mold when a flexible film according to an embodiment of the present disclosure is positioned on a ledge.
In step S30, as described above, the injection molding material 50 may be injected into the cavity 40 through the injection port to float the flexible film 30 and attach it to the boss 12.
In some examples, in step S30, the injection molding material 50 may be injected into the mold cavity 40 through injection ports (e.g., injection port 111 and injection port 112) (see fig. 7 and 8). Specifically, in some examples, the flexible film 30 may float to conform to the mold 1 under the buoyancy of the injection molding material 50 (e.g., liquid silicone).
In the positioning process (step S30), the injection molding material 50 may be selected to have a density greater than that of the flexible film 30. This enables the flexible film 30 to better float under the buoyancy of the casting compound 50. In some examples, the injection molding material 50 may include plastic or liquid silicone. This enables the casting compound 50 to be better coated on the surface of the flexible film 30. In some examples, the plastic and liquid silicone gel used may be biocompatible. In some examples, the plastic may be selected from at least one of polylactic acid and polyurethane, thereby enabling the flexible film 30 to be better applied in the field of medical devices.
In some examples, the mold 1 may be provided with a glue injection hole 110 a. In some examples, as shown in fig. 2, the glue injection hole 110a may be provided to the upper mold 10. In this case, the injection raw material 50 may enter the mold cavity 40 through the injection hole 110 a.
In some examples, the mold 1 is provided with an injection channel 110 connected to the injection hole 110 a. In some examples, the injection material 50 may be injected from the injection hole 110a, and the injection material 50 may flow along the injection channel 110 after entering the injection hole 110 a.
Additionally, in some examples, injection channel 110 may communicate with mold cavity 40 to form an injection port (e.g., injection port 111 or injection port 112). In this case, the injection raw material 50 may enter the mold cavity 40 from the injection port 111 and the injection port 112 along the injection channel 110 (see fig. 7).
In the positioning process (step S30), the injection raw material 50 may be injected from the injection hole 110a into the mold cavity 40 (for example, the injection raw material may be injected toward the injection hole 110a in the gravity direction), and may flow along the injection channel 110 after the injection raw material 50 enters the injection hole 110a, and the injection channel 110 may change the flow direction of the injection raw material 50, so that the injection raw material 50 (via the sub-channel 110a1 and the sub-channel 110a2) can enter the mold cavity 40 from an injection port (for example, the injection port 111 or the injection port 112). In this case, since the injection raw material 50 entering the mold cavity 40 is subjected to gravity, the injection raw material is stopped by the flexible film 30 disposed above the injection port 111 or 112 after entering the mold cavity 40 to flow along the lower surface 30b of the flexible film 30, and gradually supports the entire lower surface 30b of the flexible film 30, and the flexible film 30 floats by the buoyancy of the injection raw material 50, so that the upper surface 30a of the flexible film 30 is attached to the mold 1, thereby positioning the flexible film 30 in a specific shape.
In some examples, the injection port may be one or more (e.g., injection port 111 and injection port 112). In the example shown in fig. 7, the second groove 21 may form an injection port 111 and an injection port 112.
In some examples, the injection channel 110 may be divided into a plurality of sub-channels in the mold 1, which may communicate with the mold cavity 40 to form a plurality of injection ports. For example, as shown in fig. 7 and 8, the injection channel 110 may be divided into two sub-channels (sub-channel 110a1 and sub-channel 110a2) in the mold 1, and the two sub-channels 110a1 and 110a2 may communicate with the mold cavity 40. In some examples, the outflow ports of the two sub-channels 110a1 and 110a2, i.e., injection port 111 and injection port 112, may be disposed at the bottom 21a of the second groove 21.
In some examples, as described above, the bottom 21a of the second groove 21 may be provided with a plurality of injection ports (e.g., injection port 111 and injection port 112). In some examples, the bottom 21a of the second groove 21 may be provided with a plurality of injection ports. In some examples, flexible film 30 disposed in second recess 21 may cover the plurality of injection ports (e.g., injection port 111 and injection port 112). In this case, the molding material 50 can be introduced into the cavity 40 from the lower mold, and the flexible film can be floated by the buoyancy of the molding material 50 and attached to the mold 1.
In some examples, the glue injection hole 110a may be one or more. In some examples, the injection hole 110a may be provided at the upper mold 10 and/or the lower mold 20. In this case, the process requirements of different molding processes can be better adapted, thereby facilitating the subsequent injection of the molding material 50 into the mold cavity 40.
In some examples, the viscosity of the injection molding material 50 may be 10 to 100 kilo pascal seconds. Preferably, the viscosity of the injection molding material 50 may be 30 to 60 kilopascal seconds. In this case, the viscosity of the injection molding material 50 is controlled within a certain range, which not only satisfies the requirement that the injection molding material 50 has sufficient fluidity, but also effectively suppresses the occurrence of problems such as leakage, thereby optimizing the molding process and facilitating the injection molding of the flexible film 30.
In some examples, the buoyancy level of the injection molding material may be adjusted by controlling the injection rate of the injection molding material 50. In some examples, the amount of buoyancy generated by the injection molding material 50 may be equivalent to the amount of buoyancy generated by an atmospheric pressure of 0.8 to 0.9 kPa. Thereby enabling the amount of buoyancy to be adjusted so that the flexible film 30 is better conformed to the mold 1.
In some examples, the injection amount of the injection molding material 50 may be adjusted according to the size of the mold cavity 40. Thereby enabling process requirements for the flexible film 30 to be met. In some examples, in step S30, the mold cavity 40 may be filled with the injection molding material 50.
In some examples, the flexible film 30 may include a functional region 311 (see fig. 5) and a non-functional region. For example, the functional region 311 of the flexible film 30 may be a region having a stimulation electrode (i.e., the stimulation electrode region described above), and the non-functional region may be another region of the flexible film 30 that does not include the functional region 311.
In some examples, the functional regions 311 of the flexible film 30 may not be covered by the injection molding material 50, and the non-functional regions may be covered by the injection molding material 50. In some examples, the molding material 50 may enter the mold cavity 40 through the injection gate, and the side of the flexible film 30 having the functional region 311 (e.g., the upper surface 30a of the flexible film) may be disposed in the mold 1 in a manner determined by the manner in which the molding material 50 enters the mold cavity 40. For example, the molding material 50 may enter the cavity 40 from the bottom 21a of the second groove 21, and the side of the flexible film 30 having the functional region 311 may be made to face the bottom 11a of the first groove 11. In this case, when the molding material 50 enters the cavity 40, the flexible film 30 floats and fits on the mold 1 (e.g., the bottom 11a of the first groove 11 or the boss 12) by the molding material 50. This makes it possible to prevent the functional region 311 of the flexible film 30 from being covered by the casting compound 50.
In some examples, one side of the flexible film 30 having the functional region 311 may also have a non-functional region that may be coated with an injection molding material. In some examples, the bottom 11a of the first recess 11 may be provided with a boss 12 that matches the functional region 311. In some examples, the functional region 311 may be covered by the protrusion 12 when the flexible film 30 is floated and attached to the mold 1 by the injection raw material 50. In this case, the functional region 311 of the flexible film 30 can be left uncovered by the injection molding material. In some examples, the functional region 311 may completely coincide with the surface of the boss 12, i.e., the edge of the boss 12 may conform to the surface of the flexible film 30 on the peripheral side of the functional region 311. In some examples, the non-functional region of the flexible film 30 on the same side as the functional region 311 and the bottom 11a of the first groove 11 may have a gap therebetween. In this case, the functional region 311 of the flexible film 30 can be made not to be covered with the casting material 50, and the non-functional region can be made to be covered with the casting material 50.
In some examples, the gap between the boss 12 and the lower mold 20 may be greater than the thickness of the flexible film 30. In this case, the flexible film 30 can be better coated with the molding compound 50 in the presence of the lands 12.
In some examples, the flexible film 30 floats and fits on the mold 1 by the injection raw material 50, and there may be a gap between the flexible film 30 and the bottom 21a of the second groove 21. This enables the non-functional regions of the flexible film 30 to be covered with the casting compound.
In some examples, as shown in fig. 5-7, the flexible membrane 30 may include a connection portion 320 having a stimulation portion 310 and connected to the stimulation portion 310. In some examples, the connection portion 320 may be electrically connected with the stimulation portion 310. In some examples, the stimulation portion 310 may be brought into close contact with the mold 1 during the positioning process. In this case, the portion of the stimulation portion 310 attached to the mold 1 can be prevented from being covered with the molding material, and the other portion of the stimulation portion 310 can be sufficiently covered with the molding material.
In some examples, the connection part 320 may be coated with injection molding raw material, but the connection part 320 may not generate a change in shape. In some examples, the connection portion 320 may be provided with several through holes 321. In some examples, as shown in fig. 5-7, the connecting portion 320 may be secured in the mold cavity 40 after the mold clamping process. For example, as shown in fig. 3 to 7, the bottom 11a of the first groove 11 and the bottom 21a of the second groove 21 may be provided with support mechanisms 22 that match the through holes 321 on the connecting portion 320, respectively. In this case, after the mold clamping step, the connecting portion 320 can be fixed to the cavity 40 by the through hole 321 and the support mechanism 22 fitted to the through hole 321, so that the connecting portion 320 is not deformed by the injection material 50 in the positioning step. In some examples, after the mold clamping process, a gap may exist between the connecting portion 320 and the mold cavity 40, thereby enabling the connecting portion 320 to be covered by the injection raw material 50.
In some examples, the support mechanism 22 may be a support point having a small contact area with the flexible membrane 30. Within the mould 1, a plurality of support mechanisms 22 may be provided. The number of the support mechanisms 22 may be determined according to the size and shape of the injection molding object.
In some examples, the connection portion 320 may not be injection molded. In some examples, there may be no gap between the connection 320 and the mold cavity 40. This prevents the connecting portion 320 from being covered with the molding material 50.
In step S40, the upper mold 10 and the lower mold 20 may be held, and the upper mold 10 and the lower mold 20 may be heat-treated to cure and mold the injection material 50 (molding step), as described above.
In some examples, the clamped state of the upper mold 10 and the lower mold 20 (see fig. 2) may be maintained, and the upper mold 10 and the lower mold 20 may be placed in a heat treatment apparatus (not shown) for heat treatment to cure and mold the injection molding material 50. In some examples, the heat treatment apparatus is not particularly required, and may be a conventional oven or a specially-made heat treatment apparatus. In some examples, the upper mold 10 and the lower mold 20 that are held in the clamped state may be directly heat-treated without being placed in a heat treatment apparatus, for example, by heating the mold 1 with a moving heat source. Therefore, the requirements of different heat treatments under different process conditions can be met.
In some examples, the heat treatment may be selected from one or a combination of cooling, holding, heating. In this case, the injection molding materials having different properties can be cured and molded by different heat treatment methods, and thus the injection molding materials having different properties can be cured and molded more favorably. In some examples, a thermoset injection molding material may be cured by heating. In other examples, the thermoplastic injection molding material may be solidified by cooling.
In some examples, in the molding process (step S40), the temperature for curing molding may be 110 to 150 ℃. Thereby enabling control of the optimum molding time and rate, enabling better injection molding of the flexible film 30.
In some examples, the shape of flexible film 30 after injection molding may match the shape of mold cavity 40, e.g., flexible film 30 after injection molding may be the same as mold cavity 40. Thus, the flexible film 30 can be formed into a specific shape after the molding step. In some examples, the flexible film 30 is formed as a flexible film having a prescribed curvature, wherein a lower surface 30b of the flexible film is covered with an injection molding material such as silicone, and an upper surface 30a of the flexible film 30 or a portion conforming to the boss 12 is not covered with the injection molding material such as silicone.
While the present disclosure has been described in detail above with reference to the drawings and the embodiments, it should be understood that the above description does not limit the present disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.
Claims (8)
1. A method for injection molding of a flexible film having a stimulating electrode, comprising:
the method comprises the following steps:
a placement step of preparing an upper mold having a first groove and a lower mold fitted to the upper mold, and placing a flexible film having a stimulation electrode in the lower mold, wherein the first groove is provided with a projection having a predetermined curvature and projecting from a bottom of the first groove, the lower mold is provided with an injection port for supplying an injection material, the lower mold is provided with a second groove for placing the flexible film, and the injection port is provided at a bottom of the second groove;
a mold closing step of closing the upper mold and the lower mold to form a mold cavity, wherein a gap between the boss and the lower mold is larger than the thickness of the flexible film, and a gap is formed between the edge of the flexible film and the mold cavity;
a positioning step of selecting an injection molding raw material having a density greater than that of the flexible film, injecting the injection molding raw material into the mold cavity through the injection port, so that the flexible film arranged on the lower mold and located above the injection port floats under the buoyancy of the injection molding raw material and adheres to the boss of the upper mold, and controlling the injection rate of the injection molding raw material to adjust the buoyancy of the injection molding raw material within a preset range; and
and a molding step of holding the upper mold and the lower mold, and heat-treating the upper mold and the lower mold to cure and mold the injection molding material.
2. The molding method according to claim 1, wherein:
in the positioning step, the flexible film is brought into close contact with the boss by filling the cavity with the molding material.
3. The molding method according to claim 1, wherein:
the flexible film includes a stimulation portion having a stimulation electrode and a connection portion electrically connected to the stimulation portion, and in the positioning step, the stimulation portion of the flexible film is floated and attached to the boss.
4. The molding method according to claim 1, wherein:
the flexible film has a functional region including a stimulation electrode and a non-functional region, and the functional region is covered by the projection in the positioning process.
5. The molding method according to claim 4, wherein:
the non-functional area of the flexible film and the bottom of the first groove are provided with a gap, and in the positioning procedure, the injection molding raw material covers the gap.
6. The molding method according to claim 1, wherein:
in the forming step, the flexible film is formed into a curved surface having the predetermined curvature.
7. The molding method according to claim 1, wherein:
at the lower mold, a plurality of the injection ports are provided, and the flexible film covers the plurality of injection ports.
8. The molding method according to claim 1, wherein:
the bottom of the second groove is in a protruding shape with the prescribed curvature.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910793899.XA CN112440429B (en) | 2019-08-27 | 2019-08-27 | Injection molding method of flexible film with stimulating electrode |
| CN202211202305.1A CN115609845A (en) | 2019-08-27 | 2019-08-27 | Injection molding device |
| CN202211202290.9A CN115489075A (en) | 2019-08-27 | 2019-08-27 | Injection molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910793899.XA CN112440429B (en) | 2019-08-27 | 2019-08-27 | Injection molding method of flexible film with stimulating electrode |
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| CN202211202305.1A Division CN115609845A (en) | 2019-08-27 | 2019-08-27 | Injection molding device |
| CN202211202290.9A Division CN115489075A (en) | 2019-08-27 | 2019-08-27 | Injection molding method |
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| CN112440429B true CN112440429B (en) | 2022-08-09 |
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| CN201910793899.XA Active CN112440429B (en) | 2019-08-27 | 2019-08-27 | Injection molding method of flexible film with stimulating electrode |
| CN202211202290.9A Pending CN115489075A (en) | 2019-08-27 | 2019-08-27 | Injection molding method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115609845A (en) | 2023-01-17 |
| CN112440429A (en) | 2021-03-05 |
| CN115489075A (en) | 2022-12-20 |
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Address after: 518000 area a, 4th floor, building 3, Tingwei Industrial Park, No.6 Liufang Road, Xin'an street, Shenzhen City, Guangdong Province Patentee after: Shenzhen Silicon Bionics Technology Co.,Ltd. Address before: 518000 area a, 4th floor, building 3, Tingwei Industrial Park, No.6 Liufang Road, Xin'an street, Shenzhen City, Guangdong Province Patentee before: SHENZHEN SIBIONICS TECHNOLOGY Co.,Ltd. |
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