WO2020000980A1 - Procédé de formation en une étape d'orthèse cheville-pied et orthèse cheville-pied - Google Patents

Procédé de formation en une étape d'orthèse cheville-pied et orthèse cheville-pied Download PDF

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Publication number
WO2020000980A1
WO2020000980A1 PCT/CN2018/125130 CN2018125130W WO2020000980A1 WO 2020000980 A1 WO2020000980 A1 WO 2020000980A1 CN 2018125130 W CN2018125130 W CN 2018125130W WO 2020000980 A1 WO2020000980 A1 WO 2020000980A1
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Prior art keywords
assembly
ankle
pressure
mold
preset
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Ceased
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PCT/CN2018/125130
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English (en)
Chinese (zh)
Inventor
刘若鹏
赵治亚
王唯贻
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Kuang Chi Cutting Edge Technology Ltd
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Kuang Chi Cutting Edge Technology Ltd
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Publication of WO2020000980A1 publication Critical patent/WO2020000980A1/fr
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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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices ; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. long-term immobilising or pressure directing devices for treating broken or deformed bones such as splints, casts or braces
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation

Definitions

  • the invention relates to the field of manufacturing ankle and foot orthosis, in particular to a one-step forming process of an ankle and foot orthosis and an ankle and foot orthosis.
  • Carbon fiber composite prosthetics and orthotics are new applications in the field of composite materials. Carbon fiber composite materials are ideal materials for the manufacture of prostheses and orthotics. The products meet the relevant management requirements of the medical and bioengineering industries. At present, the annual global demand for carbon fiber composite prostheses and orthotics is 800,000-1.2 million sets, and the sales are US $ 1-150 million. Ankle and foot orthosis is a typical orthosis product in the above field. Although the carbon fiber composite prosthetic foot and orthosis products have been greatly developed since the advent of the product, there are still some technical problems in the production and preparation of the product, the most significant of which is also a common problem with carbon fiber composite products is that the product is prone to delamination. And pores, the formation of the defect is mainly because the air enclosed in the product is not effectively exhausted by means of pressure or vacuum during the preparation process. After the defect is formed, the product strength and fatigue resistance will be reduced, which will affect its service life. .
  • the prior art uses soft compression, that is, vulcanization, which has a certain hardness and toughness. Silicone rubber is pressurized, but most of them are silicone rubber flat plates (2D). Because the ankle and foot orthosis presents a tapered gradient from the position of the leg to the ankle, that is, the width is wide and the width is narrow, then a soft plate The pressure applied on the cover will inevitably cause the ankle to be under-pressurized. In some cases, wrinkles will appear, and serious resin accumulation will occur, which will affect the appearance of the product.
  • the existing method is to use two-step molding, that is, firstly lay up most of the prepreg for curing and then sanding, and finally lay the last two or two layers of prepreg for secondary curing.
  • this method does not completely eliminate the occurrence of defects, and at the same time increases the impact of fiber breaks on the performance of the part and related costs such as manpower and material resources.
  • the present invention proposes a one-step molding process for ankle and foot orthosis and ankle and foot orthosis. It eliminates the pressure of the original silicone plate, and is made by selecting an expandable unvulcanized silicone rubber.
  • a pressure equalizing plate (3D) that is more closely fitted to the molding mold to achieve the effect of one-step molding, thereby improving the first pass rate of the product through process improvement, and thereby improving the operating environment of the operator.
  • a one-step forming process for an ankle and foot orthosis is provided.
  • the one-step forming process of the ankle and foot orthosis includes:
  • Step S1 manufacturing a mold and a pressure equalizing plate
  • Step S2 lay the composite prepreg on the mold, and assemble the mold and the pressure equalizing plate after the composite prepreg is applied to obtain the assembly;
  • step S3 the assembly is sequentially subjected to a vacuum treatment and a curing process, wherein the curing process includes: placing the assembly in a pressure tank and pressurizing it to a first preset pressure; according to a preset first temperature gradient, Heating the assembly to a first preset temperature and keeping it warm for a first period of time;
  • step S4 the assembly is demoulded to obtain an ankle and foot orthosis.
  • step S2 the composite prepreg is laid on a transition area of the mold by means of a gradual lamination.
  • the curing process further includes: heating the assembly to a second preset temperature according to a preset second temperature gradient, and maintaining heat and pressure for a second period of time.
  • the curing process further includes:
  • the pressure in the pressurized tank will be zero, and the vacuum tank will be evacuated in the third time period, and air will be introduced into the pressurized tank in the fourth time period;
  • the vacuuming treatment includes: placing the assembly into a vacuum bag, and connecting the vacuum bag and a vacuum pump to perform the vacuuming treatment by the vacuum pump.
  • performing demolding treatment on the assembly to obtain an ankle and foot orthosis includes: demolding the assembly to obtain a tibial portion, and the inner surface of the tibial portion is used for contacting the tibia of the human body. Fit; combine the tibia and the foot to receive the foot to get an ankle and foot orthosis.
  • the one-step molding process further includes: Step S5, detecting the ankle and foot orthosis by using a pressure detection device.
  • step S2 further includes: laying a breathable felt on the surface of the pressure equalizing plate in the assembly.
  • a breathable felt is applied to the surface of the pressure equalizing plate, so as to obtain a pressure equalizing plate having a breathable felt.
  • step S2 the release agent and the composite prepreg are sequentially laid on the mold.
  • an ankle and foot orthosis is provided.
  • the ankle-foot orthosis includes: the ankle-foot orthosis is made by a one-step forming process of any of the above-mentioned ankle-foot orthosis.
  • a mold and a pressure equalizing plate are manufactured, and then the composite material prepreg is laid on the mold, and the mold and the pressure equalizing plate after the composite material prepreg is applied are assembled to obtain an assembly, and then the assembly is sequentially Vacuuming and curing, wherein the curing includes: putting the assembly into a pressure tank, pressurizing to a first preset pressure; and heating the assembly to the first according to a preset first temperature gradient Pre-set temperature and heat preservation for the first time period, and finally demoulding the assembly to obtain an ankle and foot orthosis, which can save costs and increase production value.
  • the improved one-step molding process saves half the amount of cans used in the autoclave, and in terms of materials, it saves the auxiliary materials such as breathable felt, insulation film, PE film and vacuum bag used in the original first curing. At the same time, in terms of personnel, it also reduced the one-time grinding process, saving labor costs. In addition, it also saved the bagging and demoulding work of the paving staff, saving time and improving For efficiency.
  • FIG. 1 is a flowchart of a one-step molding process of an ankle and foot orthosis according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of each step of a one-step molding process of an ankle and foot orthosis according to a specific embodiment of the present invention
  • FIG. 3 is a schematic diagram of the assembly according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a one-step molding process of an ankle and foot orthosis according to a specific embodiment of the present invention.
  • a one-step forming process of an ankle and foot orthosis is provided.
  • the one-step molding process of an ankle and foot orthosis includes: Step S101, manufacturing a mold and a pressure equalizing plate; Step S103, applying a composite prepreg on the mold, and applying the composite prepreg.
  • the mold and the pressure equalizing plate after the composite prepreg are assembled to obtain an assembly; step S105, the assembly is sequentially subjected to a vacuum treatment and a curing process, wherein the curing process includes: putting the assembly into a pressure tank , Pressurizing to the first preset pressure; heating the assembly to the first preset temperature according to the preset first temperature gradient, and maintaining the heat for the first time period; step S107, demolding the assembly, To get an ankle and foot orthosis.
  • a mold and a pressure equalizing plate are manufactured, and then the composite prepreg is laid on the mold, and the mold and the pressure equalizing plate after the composite prepreg is applied are assembled to obtain an assembly, and then The assembly is vacuumed and cured in sequence.
  • the curing process includes: placing the assembly in a pressure tank and pressurizing it to a first preset pressure; and according to a preset first temperature gradient, the assembly It is heated to the first preset temperature and kept warm for the first period of time. Finally, the assembly is demoulded to obtain an ankle and foot orthosis, which can save costs and increase production value. It is cured with the existing two-step curing process.
  • the improved one-step molding process saves half the amount of cans used in the autoclave, and in terms of materials, it saves the breathable felt, release film, PE film and vacuum used in the original first curing. At the same time, in terms of personnel, it also reduces the grinding process once, saving labor costs. In addition, it saves the bagging and demoulding work once by the paving staff, saving Time, improve work efficiency.
  • the steps of the one-step molding process of the ankle and foot orthosis include: step S21, first, cutting and laying of the prepreg; step S22, then pre-compacting the prepreg after being laid , It can pre-compact the prepreg after paving by assembling the mold; step S23, then packaging the assembled mold, if it can be packed into a vacuum bag, and then Vacuum treatment is performed by a vacuum pumping device; step S24, followed by curing treatment, for example, curing treatment at a curing temperature of 130 ° C and a pressure of 0.3 MPa; step S25, subsequent release treatment of the cured mold, and There is a grinding process; step S26, the finished product is tested.
  • the prepreg, adhesive film cutting, laying, pre-compacting, and packaging must be performed in a clean room.
  • the room should be maintained at a temperature of 22 ⁇ 4 ° C and a relative humidity of 30% to 65%.
  • the cleanliness of the indoor air should reach Dust particles equal to and larger than 10 ⁇ m should not exceed 10 particles per liter.
  • the positive pressure difference between indoor and outdoor should be 10 to 40 Pa.
  • the curing temperature is 130 ° C and the pressure is 0.3 MPa.
  • the temperature should be 15 ⁇ 32 °C, the relative humidity should be less than 75%, and the room should be well ventilated.
  • the curing temperature is 150 ° C., which is not limited in the present invention.
  • the equipment used for cutting, paving, pre-compacting, and packaging of prepregs and films include automatic feeders, ovens, and vacuum pumps.
  • autoclaves are required for curing, and universal testing is required for grinding and inspection.
  • Machine and sander are required for cutting, paving, pre-compacting, and packaging of prepregs and films.
  • the forming mold includes a male mold 1 and a pressure equalizing plate 2.
  • the pressure equalizing plate 2 has the same shape as the male mold 1 and can have a good fit with the male mold 1.
  • a back surface of the pressure equalizing plate 2 is provided. Ground hole connected to male mold 1.
  • the above-mentioned pressure-equalizing pressure equalizing plate 2 avoids bridging in the potholes during the pressurization process, resulting in a decrease in pressure transmission and defects such as pits on the surface of the product.
  • the manufacturing process of the pressure equalizing plate 2 is cumbersome, and it cannot be turned directly on the mold because the size of the pressure equalizing plate is too small due to the problem of curvature between the molds, so it needs to be polished.
  • the forming of the pressure equalizing plate 2 uses a hot press tank, the process temperature is 160 ° C., the time is 3 hours, and the pressure is 0.4 MPa.
  • breathable felt can be applied to the surface of the equalizing plate 2 during the forming process, which is beneficial to improving the strength and hardness of the equalizing plate.
  • those skilled in the art can set the size of the male mold 1 according to the required size of the ankle and foot orthosis, which is not limited in the present invention.
  • the barefoot orthosis has a large change in curvature of the shaped part in many positions of the product, which provides conditions for possible defects such as stress concentration and bridging, it is not enough to use soft compression alone. It is necessary to select a suitable compression soft mold according to the differences in the positions of the mold. For this reason, the invention adopts an overall soft mold method, which is different from the traditional soft mold flat plate.
  • the soft mold sleeve eliminates the possibility of the above defects.
  • an opening for vacuum extraction is provided on the mold 1.
  • the one-step molding process of the ankle and foot orthosis includes:
  • Step A According to the shape of the product, a male mold 1 and a pressure equalizing plate 2 of the mold shown in FIG. 3 are manufactured;
  • Step B Cut and lay the prepreg according to the requirements of the layup process on the male mold 1 with a release cloth;
  • Step C Connect the pressure equalizing plate 2 and the male mold 1 through rivets to obtain an assembly.
  • lay a breathable felt on the surface of the pressure equalizing plate in the assembly and place the assembly in a vacuum bag, and The vacuum bag is connected to a vacuum pump, so that the vacuum pumping process is performed by the vacuum pump.
  • a vacuum pump for example, under the condition of -0.95 Bar, at least 15 minutes are drawn, so that the Can remove air between male mold 1 and prepreg.
  • this embodiment shows that the pressure equalizing plate 2 and the male mold 1 are connected by rivets, those skilled in the art may choose other active connection methods of the pressure equalizing plate 2 and the male mold 1 according to actual needs. The invention does not limit this;
  • Step D heating the assembly to a first preset temperature according to a preset first temperature gradient, for example, according to an embodiment of the present invention, heating the mold to a preset temperature of 130 ° C at 1 ° C / min;
  • Step E After putting the assembly into a pressurized tank, pressurize it to a first preset pressure. For example, according to an embodiment of the present invention, put the assembly into a pressurized tank and pressurize it to 0.3 MPa. And under the conditions of step D and step E, heat preservation and pressure retention for 120min;
  • Step F The mold is heated according to the curing curve, the resin is cured, and the mold is removed.
  • steps D and E are shown, those skilled in the art should understand that the order of steps D and E can be adjusted.
  • the pressure treatment is performed first, and then the heat treatment is performed, and then under the conditions, the temperature is maintained for 120 minutes, which is not limited in the present invention.
  • the molding process of the composite material product is basically the same as that of the first embodiment, except that the large steps will cause obvious stress concentration, which will cause the phenomenon of leg fracture in the later use of the product. Therefore, in step B, a change in the prepreg paving process is added to prevent excessive steps from appearing in the transition area and reduce the stress concentration at the transition.
  • the one-step molding process of the ankle and foot orthosis includes:
  • Step A manufacturing the male mold 1 and the pressure equalizing plate 2 of the mold according to the shape of the product;
  • Step B Cut and lay the prepreg according to the requirements of the layup process on the male mold 1 with a release cloth.
  • the ankle and foot orthosis includes a tibial part and a foot part 4 connected to the tibial part.
  • the inner surface is adapted to fit the human tibia, and the foot is used to receive the human foot.
  • the tibial portion is a prepreg obtained after demolding. Meanwhile, referring to FIG.
  • the transition region 5 and the intermediate turning region 6 in the tibial portion are thickened regions, and the gradation ply is used to thicken the transition region 5 and the intermediate turning region 6, that is, the transition region 5
  • the middle turning area 6 has a plurality of layups that gradually change in size from the bottom layer to the top layer, so that the thickness of the transition area 5 and the middle turning area 6 is uniform and the transition at the surface is uniform;
  • Step C Connect the pressure equalizing plate 2 and the male mold 1 through rivets to obtain an assembly.
  • lay a breathable felt on the surface of the pressure equalizing plate in the assembly and place the assembly in a vacuum bag, and The vacuum bag is connected to a vacuum pump, so that the vacuum pumping process is performed by the vacuum pump.
  • a vacuum pump for example, under the condition of -0.95 Bar, at least 15 minutes are drawn, so that the Can remove air between male mold 1 and prepreg.
  • this embodiment shows that the pressure equalizing plate 2 and the male mold 1 are connected by rivets, those skilled in the art may choose other active connection methods of the pressure equalizing plate 2 and the male mold 1 according to actual needs. The invention does not limit this;
  • Step D heating the assembly to a first preset temperature according to a preset first temperature gradient, for example, according to an embodiment of the present invention, heating the mold to a preset temperature of 130 ° C at 1 ° C / min;
  • Step E After putting the assembly into a pressurized tank, pressurize it to a first preset pressure. For example, according to an embodiment of the present invention, put the assembly into a pressurized tank and pressurize it to 0.3 MPa. And under the conditions of step D and step E, heat preservation and pressure retention for 120min;
  • Step F The mold is heated according to the curing curve, the resin is cured, and the mold is removed.
  • steps D and E are shown, those skilled in the art should understand that the order of steps D and E can be adjusted.
  • the pressure treatment is performed first, and then the heat treatment is performed, and then under the conditions, the temperature is maintained for 120 minutes, which is not limited in the present invention.
  • the molding process of the composite material product is basically the same as that of the first embodiment, except that the temperature gradient is added in step D, and the temperature is maintained and maintained according to the temperature gradient, so that the resin is further improved during the curing stage.
  • the degree of infiltration can make the product more compact and manufacture products with complex structures.
  • the one-step molding process of the ankle and foot orthosis includes:
  • Step A According to the shape of the product, a male mold 1 and a pressure equalizing plate 2 of the mold shown in FIG. 3 are manufactured;
  • Step B Cut and lay the prepreg according to the requirements of the layup process on the male mold 1 with a release cloth.
  • the transition region 5 and the intermediate turning region 6 at the tibial portion are thickened regions, and the transitional layer 5 and the intermediate turning region 6 are thickened by a gradual lamination method so that the transition region 5 and the intermediate turning region 6 are thickened.
  • the thickness is uniform and the transition at the surface is uniform;
  • Step C Connect the pressure equalizing plate 2 and the male mold 1 through rivets to obtain an assembly.
  • lay a breathable felt on the surface of the pressure equalizing plate in the assembly and place the assembly in a vacuum bag, and The vacuum bag is connected to a vacuum pump, so that the vacuum pumping process is performed by the vacuum pump.
  • a vacuum pump for example, under the condition of -0.95 Bar, at least 15 minutes are drawn, so that the Can remove air between male mold 1 and prepreg.
  • this embodiment shows that the pressure equalizing plate 2 and the male mold 1 are connected by rivets, those skilled in the art may choose other active connection methods of the pressure equalizing plate 2 and the male mold 1 according to actual needs. The invention does not limit this;
  • Step D heating the assembly to a first preset temperature according to a preset first temperature gradient, and heating the assembly to a second preset temperature according to a preset second temperature gradient, and in a second time period Internal thermal insulation and pressure retention, for example, according to an embodiment of the present invention, the mold is heated to a preset temperature of 50 ° C at 1 ° C / min, and maintained for 60 minutes, and the mold is heated to a preset temperature of 130 ° C at 1 ° C / min. Pressure for 120min;
  • Step E After putting the assembly into a pressurized tank, pressurize it to a first preset pressure. For example, according to an embodiment of the present invention, put the assembly into a pressurized tank and pressurize it to 0.3 MPa. And under the conditions of step D and step E, heat preservation and pressure retention for 120min;
  • Step F The mold is heated according to the curing curve, the resin is cured, and the mold is removed.
  • steps D and E are shown, those skilled in the art should understand that the order of steps D and E can be adjusted.
  • the pressure treatment is performed first, and then the heat treatment is performed, and then under the conditions, the temperature is maintained for 120 minutes, which is not limited in the present invention.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the molding process of the composite material product is basically the same as the above-mentioned second embodiment, except that in step D, a defoaming process is added, and repeated vacuum-air defoaming technology is used. Reduce air bubbles between prepreg layers to ensure product quality.
  • the one-step forming process of the ankle and foot orthosis includes:
  • Step A manufacturing the male mold 1 and the pressure equalizing plate 2 of the mold according to the shape of the product;
  • Step B Cut and lay the prepreg according to the requirements of the layup process on the male mold 1 with a release cloth.
  • the transition region 5 and the intermediate turning region 6 at the tibial portion are thickened regions, and the transitional layer 5 and the intermediate turning region 6 are thickened by a gradual lamination method so that the transition region 5 and the intermediate turning region 6 are thickened.
  • the thickness is uniform and the transition at the surface is uniform;
  • Step C Connect the pressure equalizing plate 2 and the male mold 1 through rivets to obtain an assembly.
  • lay a breathable felt on the surface of the pressure equalizing plate in the assembly and place the assembly in a vacuum bag, and The vacuum bag is connected to a vacuum pump, so that the vacuum pumping process is performed by the vacuum pump.
  • a vacuum pump for example, under the condition of -0.95 Bar, at least 15 minutes are drawn, so that the Can remove air between male mold 1 and prepreg.
  • this embodiment shows that the pressure equalizing plate 2 and the male mold 1 are connected by rivets, those skilled in the art may choose other active connection methods of the pressure equalizing plate 2 and the male mold 1 according to actual needs. The invention does not limit this;
  • Step D After putting the assembly into a pressure tank, pressurize it to a first preset pressure, and heat the assembly to a first preset temperature according to a preset first temperature gradient, and step A
  • the pressure drop in the pressure tank is zero, and the pressure tank is evacuated in the third period, and the air is introduced into the pressure tank in the fourth period, and the above step A is repeated until the execution The number of times is the same as the preset number, then the cycle is stopped, and then the pressure is increased to the second preset pressure, and the assembly is heated to the third preset temperature according to the preset third temperature gradient, and within the third time period
  • the air temperature is set to 50 ° C
  • the heating rate is set to 1 ° C / min.
  • the tank door After the tank door is closed, it starts at the same time. Pressurize and heat up, and count the time. After 20 minutes, release the pressure to 0 first, and then open the air to 15min after vacuuming for 10min, then perform a second vacuum for 10min and then open the atmosphere for 15min, and then after the third vacuum Open the atmosphere for more than 15min in the above three cycles , Vented to atmosphere, the set pressure 0.3MPa, the set air temperature of 135 deg.] C, heating rate was set to 2 °C / min, and began pressurized and heated to the timing when the temperature reaches 130 °C, holding 2H;
  • Step E The mold is heated according to the curing curve, the resin is cured, and the mold is removed.
  • a tibial portion is obtained, and then the tibial portion and the foot are combined to obtain an ankle and foot orthosis.
  • the finished ankle and foot orthosis is then tested.
  • the testing process is as follows:
  • Test method Fix the foot of the product with a steel fixture, press with a steel pressure plate, apply a load rod to the produced tibia, and load the point at a distance of 100mm from the foot;
  • Test parameters preload is 10N, record the load value when the deformation is 10mm;
  • Test equipment universal testing machine
  • Test standard small (S): load range 300-406N when the deformation is 10mm, the ratio is 30-40.6N / mm; medium (M): load range 314-425N when the deformation is 10mm, the ratio is 31.4- 42.5N / mm; Large (L): Load range is 344-465N when the deformation is 10mm, and the ratio is 34.4-46.5N / mm.
  • an ankle and foot orthosis is also provided.
  • the ankle-foot orthosis includes: the ankle-foot orthosis is made by a one-step forming process of any of the above-mentioned ankle-foot orthosis.
  • the curing process includes: putting the assembly into a pressure tank, pressurizing to a first preset pressure; according to the preset A first temperature gradient, which heats the assembly to a first preset temperature and insulates it for a first period of time, and finally performs a demolding process on the assembly to obtain an ankle and foot orthosis, which can save costs and increase production value.
  • the improved one-step molding process saves half the amount of cans in the use of the autoclave, and in terms of materials, it saves the breathable felt used in the original first curing. , Isolation film, PE film and vacuum bag, etc. At the same time, in terms of personnel, it also reduces the one-time grinding process, saving labor costs, in addition, it also saves the shoppers to pack the bag once. Stripping work, saving time and increasing efficiency.

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  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Orthopedic Medicine & Surgery (AREA)
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  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de formation en une étape d'une orthèse cheville-pied et une orthèse cheville-pied. Le procédé de formation en une étape de l'orthèse cheville-pied comprend : en étape S1, la fabrication d'un moule et d'une plaque d'égalisation de pression (2) ; en étape S2, le pavage d'un préimprégné composite sur le moule et l'assemblage du moule revêtu avec le préimprégné composite et la plaque d'égalisation de pression (2) l'un à l'autre pour obtenir un ensemble ; en étape S3, la réalisation d'un procédé de mise sous vide et d'un procédé de durcissement sur l'ensemble séquentiellement, le procédé de durcissement incluant : le placement de l'ensemble dans un réservoir sous pression et la mise sous pression d'une première pression prédéfinie ; et le chauffage, selon un premier gradient de température prédéfini, de l'ensemble à une première température prédéfinie et le maintien de la température pendant une première durée ; et en étape S4, la réalisation d'un procédé de démoulage sur l'ensemble pour obtenir une orthèse cheville-pied. La mise en œuvre de la solution technique décrite permet de réaliser des économies et d'augmenter la valeur de production.
PCT/CN2018/125130 2018-06-26 2018-12-29 Procédé de formation en une étape d'orthèse cheville-pied et orthèse cheville-pied Ceased WO2020000980A1 (fr)

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