CN115835430B - Preparation method of flexible PTC heater for intelligent wearing - Google Patents
Preparation method of flexible PTC heater for intelligent wearing Download PDFInfo
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- CN115835430B CN115835430B CN202310106148.2A CN202310106148A CN115835430B CN 115835430 B CN115835430 B CN 115835430B CN 202310106148 A CN202310106148 A CN 202310106148A CN 115835430 B CN115835430 B CN 115835430B
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Abstract
The application provides a preparation method of a flexible PTC heater for intelligent wearing, which relates to the technical field of preparation of flexible PTC heaters for intelligent wearing, and adopts a surface packaging technology to prepare the flexible PTC intelligent heater in a mode of sticking a sheet PTC element on a flexible printed board, wherein the preparation steps comprise preparation of the sheet PTC element; pretreating, fixing and printing an FPC; SMD mounting and solidifying; and the split board and the USB terminal are installed. According to the preparation method of the flexible PTC heater for intelligent wearing, the chip PTC elements and the flexible circuit board are bonded through the conductive adhesive, the distribution direction of the chip PTC elements is perpendicular to the bending direction required by the flexible circuit board, the chip PTC elements are not easy to separate from the chip PTC elements when the flexible circuit board is bent for use, the chip PTC elements can be firmly arranged on the flexible circuit board, and the reliability of the flexible PTC heater for intelligent wearing is improved.
Description
Technical Field
The application relates to the technical field of flexible PTC heater preparation for intelligent wearing, in particular to a preparation method of the flexible PTC heater for intelligent wearing.
Background
The intelligent wearing technology is a high-tech information technology which uses fashionable electronic equipment as clothes and accessories of the clothes or articles attached to the body through a computer and an advanced electronic technology so as to realize various practical functions;
the medical care equipment industry has the dual properties of wearing and health care, and has the characteristics of high guest unit price and repurchase rate, and the market is blue sea; at the demand end, along with the national economy level promotion and aging exacerbation of urban double-wheel promotion medical care demands in China;
the PTC constant-temperature physiotherapy flexible intelligent wearing heating equipment with the traditional Chinese medicine 'thermotherapy' concept takes a flexible printed board as a substrate, and a plurality of PTC components are connected in series and parallel on the substrate, and proper initial heating power and constant temperature are designed to achieve the optimal drug release effect;
in recent years, the wearable traditional Chinese medicine physiotherapy instrument is used as an intelligent wearing device with a protruding foreign matter, has a wide market prospect, utilizes PTC electric-thermal characteristics, combines modern intelligent wearing and traditional Chinese medicine 'thermo-therapy' concepts, and the developed PTC constant temperature physiotherapy nursing belt can provide a solution for patients with neck and shoulder pain, lumbago and leg pain, cold abdomen and uterus and other chronic diseases and potential ill people and improve the life quality of the patients, and the PTC in the prior art is easy to fall off when being used after being connected with a flexible printed board, so that the intelligent wearing flexible PTC heater is invalid.
Disclosure of Invention
The application provides a flexible PTC heater preparation method for intelligent wearing, makes piece formula PTC element and flexible circuit board pass through the conductive adhesive bonding, is difficult to separate with piece formula PTC element when flexible circuit board bending use, can be with the firm installation of piece formula PTC element on flexible circuit board, improves the reliability of flexible PTC heater for intelligent wearing to improve above-mentioned problem.
The invention is specifically as follows: the preparation method of the flexible PTC heater for intelligent wearing comprises the following preparation steps:
a. preparation of a sheet type PTC element: preparing 100 parts of PTC porcelain and 15-30 parts of adhesive into slurry according to parts by weight, and then carrying out the process flows of casting, laminating, cutting, sintering and electrode terminating to obtain a sheet type PTC element;
b. FPC pretreatment, fixing and printing: before SMT, pre-baking FPC, cooling, precisely fixing FPC on a carrier plate, and printing conductive adhesive joints by adopting a conductive paste type printer with an optical positioning system;
c. SMD mounting and curing: the chip PTC element is attached to two corresponding bonding points on the designed FPC, and then ultraviolet light source irradiation crosslinking is adopted, so that the chip PTC element and the FPC are solidified and connected into a whole;
d. and (3) mounting a split board and a USB terminal: the FPC is provided with a plurality of same circuit units (namely a plurality of independent heaters), the FPC is cut into a plurality of independent heaters through a partition after being attached, and finally a USB terminal is arranged on each independent heater, so that the PTC flexible heater is finally obtained, a plurality of heaters are processed at one time, and the efficiency of preparation and processing can be improved.
Further, the porcelain of the sheet type PTC element comprises the following materials: baCO 3 、SrCO 3 、TiO 2 、Y 2 O 3 、SiO 2 And Mn (NO) 3 ) 2 The chemical equation of the ceramic material of the chip PTC element is:
；
further, the conductive adhesive is ultraviolet curing epoxy conductive adhesive, and the adhesive sheet type PTC element is easy to solidify after being irradiated by an ultraviolet light source.
The type of the epoxy conductive adhesive is E-51, and the epoxy conductive adhesive comprises 100 parts of epoxy resin, 15 parts of a flexible curing agent and 250 parts of 300-mesh silver powder according to parts by weight.
Further, the method for manufacturing the epoxy conductive adhesive comprises the following steps: mixing epoxy resin and acetone, adding silver powder, stirring uniformly, adding a flexible curing agent, stirring uniformly, heating to 120 ℃ and curing after two hours.
Further, be equipped with the negative pole copper electrode of U-shaped and the positive pole copper electrode of U-shaped on the FPC respectively, negative pole copper electrode and the relative setting of positive pole copper electrode, and the front end horizontal part of negative pole copper electrode is located the inboard of positive pole copper electrode, and the horizontal part of positive pole copper electrode rear end is located the inboard of negative pole copper electrode, transversely equidistant be provided with one row of slice PTC element between the horizontal part of positive pole copper electrode rear end and the horizontal part of negative pole copper electrode rear end, transversely equidistant be provided with another row of slice PTC element between the horizontal part of positive pole copper electrode front end and the horizontal part of negative pole copper electrode front end, slice PTC element vertically places, negative pole copper electrode and positive pole copper electrode are connected through the conducting resin respectively at the both ends of slice PTC element, and when the bending direction perpendicular to slice PTC element's of FPC place the direction, because FPC is flexible circuit board, with slice PTC element interference area is little when flexible circuit board bends, flexible circuit board bends about being difficult for making slice PTC element drop.
Further, the adhesion enhancing groove is formed in the position, located at the conductive adhesive joint, of the FPC, conductive adhesive is filled in the adhesion enhancing groove, the adhesion enhancing groove is designed to improve the quantity of conductive adhesive at the adhesive joint, meanwhile, the contact area between the conductive adhesive and the flexible circuit board is enlarged, the adhesive effect is improved, and the sheet type PTC element is prevented from falling off.
The inner wall of the adhesion enhancing groove is uniformly provided with the adhesion teeth, and the adhesion teeth are arranged, so that the contact area of the conductive adhesive and the flexible circuit board is increased, and the failure of the bonding part of the conductive adhesive and the flexible circuit board is avoided.
Further, still include the incision, the incision is horizontal rectangle logical groove, is located on the FPC and transversely equidistantly offered the incision between two rows of piece formula PTC components, and notched both ends are semicircle, set up the incision and do benefit to FPC in notched position fore-and-aft direction bending, the crack appears in notch tip on the FPC when the semicircle structure at both ends can avoid the fore-and-aft direction bending, increases the bending degree of freedom of four directions from this to reach the effect of flexible bending.
Further, the PTC flexible heater still includes heat transfer subassembly, heat transfer subassembly includes heat conduction rubber pad, metal heat conduction spare, ventilative groove and connects protruding edge, has cup jointed metal heat conduction spare on every piece formula PTC element respectively, and heat conduction rubber pad's bottom recess is connected with metal heat conduction spare cooperation, and ventilative groove has been seted up vertically and horizontally at heat conduction rubber pad's top, and heat conduction rubber pad's bottom side is provided with the protruding edge of connection of square frame form.
The heat that the piece formula PTC component sent is transmitted for the heat conduction rubber pad through metal heat conduction spare, improves the speed that the heat transfer was gone out, then transmits for the position of use through the heat conduction rubber pad, uses ventilative groove can make to leave ventilative clearance between heat conduction rubber pad and the human body, and the protruding edge of connection is conveniently fixed by the protection installation component.
Further, PTC flexible heater still includes protection installation component, protection installation component includes insulating pad down, go up insulating pad, ventilative screen cloth, installation protection frame, fixed protruding edge, the bolt, the nut, the installation screw hole, FPC's downside is provided with insulating pad down, insulating pad's side is provided with fixed protruding edge down, FPC's upside is provided with insulating pad, go up insulating pad and lie in between FPC and the heat conduction rubber pad, and go up the rectangle logical groove that corresponds with the piece formula PTC element on the insulating pad, ventilative screen cloth is laid in the upside of heat conduction rubber pad, ventilative screen cloth, the heat conduction rubber pad, go up insulating pad, FPC and lower insulating pad constitute the flexible board group, the side edge of flexible board group has cup jointed the installation protection frame, the installation protection frame is the rubber material, and the inboard upper and lower ends of installation protection frame are provided with the draw-in groove respectively, interlude is equipped with the bolt in the through-hole in installation protection frame four corners, the bolt passes ventilative screen cloth in proper order, the heat conduction rubber pad, go up insulating pad, FPC and the hole and bottom threaded connection in four corners of lower insulating pad has the nut, and vertically run through on the bolt and set up the installation screw hole.
The lower insulating pad, go up insulating pad and can protect the electrically conductive position of FPC upside, ventilative screen cloth can avoid heat conduction rubber pad direct contact human, simultaneously further improve the ventilative effect of heating position, the border parcel of installation guard frame with flexible board group improves its wholeness, the draw-in groove of upside and the protruding joint of following of connection, ventilative screen cloth is very thin, consequently also can be gone into in the draw-in groove of upside by the protruding card of connecting, the draw-in groove of downside and the fixed protruding joint of following, improve the fixed fastness of installation guard frame to heat conduction rubber pad and lower insulating pad, make flexible board group upside by firm installation, to ventilative screen cloth through bolt and nut, heat conduction rubber pad, go up insulating pad, FPC and lower insulating pad's four corners fix a position, the through-hole both ends in installation guard frame four corners set up to counter bore form respectively, make the hidden installation of bolt, the installation screw hole can conveniently install accessory part.
Further, the intelligent wearing type flexible heater comprises an intelligent wearing built-in mounting unit, an FPC middle anti-breaking assembly and a smooth connecting assembly, wherein adjacent PTC flexible heaters are connected together through the intelligent wearing built-in mounting unit, the intelligent wearing built-in mounting unit is provided with the FPC middle anti-breaking assembly corresponding to the bottom center of the PTC flexible heaters, and the two adjacent PTC flexible heaters are connected through the smooth connecting assembly which is not less than three. The intelligent wearing built-in installation unit is convenient to install a plurality of PTC flexible heaters in the intelligent wearing equipment (namely PTC constant temperature physiotherapy nursing belt), and simultaneously can also deform, the PTC flexible heaters are pressed towards the human body, the FPC middle part is prevented from being broken, the FPC middle part is pressed, the FPC is prevented from being broken due to overlarge stress when being bent and deformed, the FPC is prevented from being broken due to overlarge stress, and the adjacent PTC flexible heaters can be smoothly connected by the smooth connection assembly, so that the external integrity of the intelligent wearing equipment is improved.
The beneficial effects of the invention are as follows:
according to the preparation method of the flexible PTC heater for intelligent wearing, the sheet type PTC element is bonded with the flexible circuit board through the conductive adhesive, and is not easy to separate from the sheet type PTC element when the flexible circuit board is bent and used, so that the sheet type PTC element can be firmly arranged on the flexible circuit board, and the reliability of the flexible PTC heater for intelligent wearing is improved;
according to the preparation method of the flexible PTC heater for intelligent wearing, the sheet type PTC element is longitudinally placed, when the flexible circuit board is bent left and right, the interference area between the flexible circuit board and the sheet type PTC element is small, the sheet type PTC element is not easy to fall off, the notch is arranged to be beneficial to bending of the FPC in the front-back direction of the notch position, the semicircular structures at the two ends can avoid cracks at the end parts of the notch on the FPC when the FPC is bent in the front-back direction, the interference area between the flexible circuit board and the sheet type PTC element is small when the flexible circuit board is bent left and right, and the bending point is positioned at the notch when the flexible circuit board is bent front and back, so that the bending freedom degree of the four directions is increased, and the effect of flexible bending is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of manufacturing steps of a method for manufacturing a flexible PTC heater for smart wear provided in the present application;
fig. 2 is a schematic structural view of the PTC flexible heater provided in the present application;
fig. 3 is a schematic view of a partial cross-sectional structure of the PTC flexible heater provided in the present application;
fig. 4 is a schematic view of a partial structure of the PTC flexible heater provided in the present application when bent left and right;
FIG. 5 is a schematic diagram of a bending resistance test of the PTC flexible heater provided by the present application;
fig. 6 is a schematic structural diagram of a sheet type PTC element in the PTC flexible heater provided in the present application
Fig. 7 is an exploded view of the PTC flexible heater provided in the present application;
fig. 8 is a schematic view of a bottom view of the PTC flexible heater provided in the present application;
fig. 9 is a schematic view showing a partial sectional structure of a protective frame installed in the PTC flexible heater provided in the present application;
fig. 10 is a schematic view of a bolt structure in the PTC compliant heater provided in the present application;
fig. 11 is a schematic structural view of the PTC flexible heater provided in the present application.
Icon: 1 FPC (i.e. flexible circuit board), 2 pieces of PTC elements, 3 cuts, 4 cathode copper electrodes, 5 anode copper electrodes, 6 wiring holes, 7 attachment teeth, 8 conductive glue, 9 heat transfer components, 91 conductive rubber pads, 92 conductive sleeves, 93 conductive sheets, 94 ventilation grooves, 95 connection convex edges, 10 protection installation components, 101 lower insulation pads, 102 upper insulation pads, 103 ventilation net cloth, 104 installation protection frames, 105 fixing convex edges, 106 bolts, 107 nuts, 108 installation threaded holes, 109 clamping grooves, 11 intelligent wearing built-in installation units, 111 elastic deformation steel bars, 112 telescopic rods, 113 pressing springs, 114 connecting sleeves, 115 limiting nuts, 116 intelligent wearing built-in wiring holes, 12 FPC middle anti-breaking components, 121 installation sleeves, 122 positioning screws, 123 long plates, 124 pressing springs, 125 pressing plates, 13 connecting components, 131 elastic deformation pieces and 132 clamping seats.
Description of the embodiments
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are 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 application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put when the product of the application is used, or the orientation or positional relationship that is conventionally understood by those skilled in the art, or the orientation or positional relationship that is conventionally put when the product of the application is used, which is merely for convenience of describing the application and simplifying the description, and is not indicative or implying that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Examples
Referring to fig. 1-6, a method for manufacturing a flexible PTC heater for intelligent wearing includes the following steps:
a. preparation of a sheet type PTC element: preparing 100 parts of PTC porcelain and 15-30 parts of adhesive into slurry according to parts by weight, and then carrying out the process flows of casting, laminating, cutting, sintering and electrode terminating to obtain a sheet type PTC element;
b. FPC pretreatment, fixing and printing: before SMT, pre-baking FPC, cooling, precisely fixing FPC on a carrier plate, and printing conductive adhesive joints by adopting a conductive paste type printer with an optical positioning system;
the most important technological requirement of SMT on the surface of the FPC is positioning, because the hardness of the FPC board is insufficient and the FPC board is softer, if a special carrier board is not used, the fixation and the transmission cannot be finished, and the basic SMT procedures such as printing, pasting, furnace passing and the like cannot be finished;
c. SMD mounting and curing: the chip PTC element is attached to two corresponding bonding points on the designed FPC, and then ultraviolet light source irradiation crosslinking is adopted, so that the chip PTC element and the FPC are solidified and connected into a whole;
d. and (3) mounting a split board and a USB terminal: the FPC is provided with a plurality of same circuit units (namely a plurality of independent heaters), the FPC is cut into a plurality of independent heaters through a partition after being attached, and finally a USB terminal is arranged on each independent heater, so that the PTC flexible heater is finally obtained, a plurality of heaters are processed at one time, and the efficiency of preparation and processing can be improved.
The porcelain of the sheet type PTC element comprises the following materials: baCO 3 、SrCO 3 、TiO 2 、Y 2 O 3 、SiO 2 And Mn (NO) 3 ) 2 The chemical equation of the ceramic material of the chip PTC element is:
；
the Curie point of the chip PTC element is 30-90 ℃, the resistance value of the chip PTC element at 25 ℃ is 22+20% omega, the balance power of the chip PTC element is 0.3-0.5w, and the balance current of the chip PTC element is 70-100mA.
The conductive adhesive adopts ultraviolet curing epoxy conductive adhesive, and the adhesive sheet type PTC element is easy to solidify after being irradiated by an ultraviolet light source. The type of the epoxy conductive adhesive is E-51, and the epoxy conductive adhesive comprises 100 parts of epoxy resin, 15 parts of a flexible curing agent and 250 parts of 300-mesh silver powder according to parts by weight.
The manufacturing method of the epoxy conductive adhesive comprises the following steps: mixing epoxy resin and acetone, adding silver powder, stirring uniformly, adding a flexible curing agent, stirring uniformly, heating to 120 ℃ and curing after two hours.
The flexible curing agent is polysebacic anhydride, azelaic anhydride, cis-butadiene anhydride, dodecenyl succinic anhydride and modified products thereof.
The FPC flexible circuit board can be freely bent, folded and wound, can be freely moved and stretched in a three-dimensional space, has good heat dissipation performance, can reduce the volume by utilizing the flexible circuit board, and can realize the purposes of light weight, miniaturization and thinner design.
The flexible intelligent wearable heating equipment takes a flexible printed board as a substrate, and a plurality of sheet PTC elements are connected in series and parallel on the substrate, so that the optimal release effect of the medicine is achieved by designing proper initial heating power and constant temperature.
The dimensions of the sheet PTC element are shown in the following table (see fig. 6):
the parameters of the sheet PTC element are as follows:
referring to fig. 1-6, a method for manufacturing a flexible PTC heater for intelligent wearing is substantially the same as the first embodiment, except that:
the FPC 1 is respectively provided with a U-shaped cathode copper electrode 4 and a U-shaped anode copper electrode 5, the cathode copper electrode 4 and the anode copper electrode 5 are oppositely arranged, the horizontal part of the front end of the cathode copper electrode 4 is positioned at the inner side of the anode copper electrode 5, the horizontal part of the rear end of the anode copper electrode 5 is positioned at the inner side of the cathode copper electrode 4, a row of sheet PTC elements 2 are transversely equidistantly arranged between the horizontal part of the rear end of the anode copper electrode 5 and the horizontal part of the rear end of the cathode copper electrode 4, another row of sheet PTC elements 2 are transversely equidistantly arranged between the horizontal part of the front end of the anode copper electrode 5 and the horizontal part of the front end of the cathode copper electrode 4, the sheet PTC elements 2 are longitudinally arranged, the arrangement direction of the sheet PTC elements 2 is mutually perpendicular to the bending direction of the PTC flexible heater during operation, and when the bending direction of the sheet PTC elements 2 is perpendicular to the arrangement direction of the sheet PTC elements 2 through conductive adhesive, as the FPC is a flexible circuit board, the flexible circuit board is small in the bending area, the sheet PTC elements are not easy to bend left and right, the sheet PTC elements are difficult to fall off, and the sheet PTC elements are uniformly distributed in an intelligent interference manner, and the flexible PTC device is beneficial to being worn.
The anode and the cathode of the USB terminal are respectively connected with the anode copper electrode 5 and the cathode copper electrode 4;
still include incision 3, incision 3 is horizontal rectangle logical groove, and incision 3 has been seted up to horizontal equidistance between being located two rows of slice PTC components on the FPC, and incision 3's both ends are half circular, set up the incision and do benefit to FPC in the bending of notched position fore-and-aft direction, and the crack appears in incision tip on the FPC when the semicircle structure at both ends can avoid the bending of fore-and-aft direction, increases the bending degree of freedom of four directions from this to reach the effect of flexible bending.
Wiring holes are formed in the FPC at equal distances transversely between the adjacent notches 3, and hole-shaped wiring can be arranged;
the PTC flexible heater adopts a flexible printed board to manufacture electrodes and electrode circuits, the heating unit element adopts ceramic PTC material to manufacture a chip element in an end electrode mode, in order to increase the connection reliability between the PTC element and the printed circuit board, elastic conductive adhesive is adopted for connection, in order to improve the flexibility of the heating module, holes are formed in proper positions on the flexible printed board, the positions of the holes are determined according to the bending condition of a working face, and the bonding direction of the PTC element is mutually perpendicular to the bending direction of the working face.
The conductive adhesive is formed with a conductive material mixed with an epoxy resin, and a conductive joint portion for connecting electronic components is formed on a PCB (Print Circuit Board: printed circuit board). Conductive adhesives are often used to replace conventional SMT (Surface Mount Technology: surface mount technology) solder based on the physical properties of the adhesive, and epoxy materials mixed with conductive fillers are generally used as the conductive adhesives.
Conductive adhesives are attracting attention as substitutes for solder because of their ability to be lead-free and reliable, and because of their low curing temperature, the conductive adhesives have a reduced risk of damage to components with low heat resistance during the manufacturing process, and at the same time have an increased resistance to thermal and mechanical stresses;
in general, a solder-mounted component placed under a severe temperature change environment causes a difference in expansion and contraction between the component and a circuit board if subjected to thermal shock, thereby increasing the burden on the soldered portion and inducing cracking, but such risk hardly occurs in the conductive adhesive mounting, and in the future, the conductive adhesive will be expected to be applied to a wider range of applications, and it is expected that some of the conventional solder-packaging markets will be replaced with international standardization of the conductive adhesive.
The adhesive strength of the product, which can use the conductive adhesive, is improved by 2 times compared to that of the conventional solder product.
Referring to fig. 1-6, a method for manufacturing a flexible PTC heater for intelligent wearing is substantially the same as the second embodiment, except that:
the adhesion enhancing groove is formed in the position, located at the conductive adhesive joint, of the FPC 1, conductive adhesive 8 is filled in the adhesion enhancing groove, the quantity of the conductive adhesive at the adhesive joint can be increased by designing the adhesion enhancing groove, meanwhile, the contact area between the conductive adhesive and the flexible circuit board is enlarged, the adhesive effect is improved, and the sheet PTC element is prevented from falling off.
The inner wall of the adhesion enhancing groove is uniformly provided with the adhesion teeth 7, and the adhesion teeth 7 are arranged, so that the contact area between the conductive adhesive 8 and the flexible circuit board 1 is increased, and the failure of the bonding part between the conductive adhesive 8 and the flexible circuit board 1 is avoided.
Referring to fig. 7-11, a method for manufacturing a flexible PTC heater for intelligent wearing is substantially the same as the third embodiment, except that:
the PTC flexible heater still includes heat transfer subassembly 9, heat transfer subassembly 9 includes heat conduction rubber pad 91, metal heat conduction spare, ventilative groove 94 and connects protruding edge 95, has cup jointed metal heat conduction spare on every piece formula PTC element respectively, and the bottom recess of heat conduction rubber pad 91 is connected with metal heat conduction spare cooperation, and ventilative groove 94 has been seted up vertically and horizontally at the top of heat conduction rubber pad 91, and the bottom side of heat conduction rubber pad 91 is provided with the protruding edge 95 of square frame form connection.
The metal heat conducting piece comprises a heat conducting sleeve 92 and a heat conducting sheet 93, wherein the heat conducting sleeve 92 and the heat conducting sheet 93 are made of aluminum, the heat conducting sleeve 92 is sleeved on the upper side of the sheet PTC element, the heat conducting sheets 93 are connected to the side surface of the heat conducting sleeve 92 at equal intervals, the heat conducting sleeve 92 and the heat conducting sheet 93 are inlaid at the bottom of the heat conducting rubber pad 91, and heat emitted by the sheet PTC element is transferred to the heat conducting rubber pad 91 by means of the aluminum heat conducting sleeve 92 and the aluminum heat conducting sheet 93;
the heat that the piece formula PTC element sent is transmitted for heat conduction rubber pad 91 through the metal heat conduction spare, improves the speed that the heat transfer was gone out, then transmits for the position of use through heat conduction rubber pad 91, uses ventilative groove 94 can make to leave ventilative clearance between heat conduction rubber pad 91 and the human body, and the connection protruding edge 95 is conveniently fixed by the protection installation component.
Referring to fig. 7-11, a method for manufacturing a flexible PTC heater for intelligent wearing is substantially the same as the fourth embodiment, except that:
the PTC flexible heater still includes protection installation component 10, protection installation component 10 includes insulating pad 101 down, go up insulating pad 102, ventilative screen cloth 103, installation protection frame 104, fixed protruding edge 105, bolt 106, nut 107, installation screw hole 108, FPC's downside is provided with insulating pad 101 down, the side of insulating pad 101 is provided with fixed protruding edge 105 down, FPC's upside is provided with insulating pad 102, go up insulating pad 102 and lie in between FPC and the heat conduction rubber pad 91, and go up and be equipped with the rectangle logical groove that corresponds with the piece formula PTC element on the insulating pad 102, screen cloth ventilative 103 lays in the upside of heat conduction rubber pad 91, ventilative screen cloth 103, heat conduction rubber pad 91, go up insulating pad 102, FPC and lower insulating pad 101 constitute the flexible board group, the side edge of flexible board group has cup jointed installation protection frame 104, installation protection frame 104 is rubber material, and the inboard upper and lower extreme of installation protection frame 104 is provided with draw-in groove 109 respectively, the through-hole of installation protection frame 104 four corners is equipped with bolt 106, bolt 106 alternates ventilative 103 in proper order, heat conduction rubber pad 91, go up insulating pad 102, four corners and lower insulating pad 101's hole and bottom and lower insulating pad 101 have been connected with screw hole 107, and threaded hole 107 has been seted up vertically.
The lower insulating pad 101 and the upper insulating pad 102 are flexible pads;
the lower insulating pad 101, go up insulating pad 102 and can protect the electrically conductive position of FPC 1 upside, ventilative screen cloth 103 can avoid heat conduction rubber pad 91 direct contact human body, simultaneously further improve the ventilative effect of heating position, the border parcel of installation protection frame 104 with flexible board group improves its wholeness, the draw-in groove 109 and the connection protruding edge 95 joint of upside, ventilative screen cloth 103 is very thin, consequently also can be by the connection protruding edge 95 card into the draw-in groove 109 of upside, the draw-in groove 109 and the fixed protruding edge 105 joint of downside, the fixed firmness of installation protection frame 104 to heat conduction rubber pad 91 and lower insulating pad 101 is improved, make flexible board group upside by firm installation, fix a position ventilative screen cloth 103 through bolt 106 and nut 107, heat conduction rubber pad 91, go up insulating pad 102, FPC and lower insulating pad 101's four corners, the through-hole both ends in installation protection frame 104 four corners set up to the counter bore form respectively, make bolt 106 hidden installation, installation screw hole 108 can conveniently install the accessory part.
Referring to fig. 7-11, a method for manufacturing a flexible PTC heater for intelligent wearing is substantially the same as the fifth embodiment, except that:
the intelligent wearing built-in mounting unit 11, the FPC middle part breaking prevention assembly 12 and the smooth connecting assembly 13 are further included, adjacent PTC flexible heaters are connected together through the intelligent wearing built-in mounting unit 11, the FPC middle part breaking prevention assembly 12 corresponding to the bottom center of the PTC flexible heaters is arranged on the intelligent wearing built-in mounting unit 11, and two adjacent PTC flexible heaters are connected through at least three smooth connecting assemblies 13;
the intelligent wearing built-in installation unit 11 comprises elastic deformation steel bars 111, telescopic rods 112, pressing springs 113, connecting sleeves 114, limit nuts 115 and intelligent wearing built-in threading holes 116, wherein the bottoms of installation threaded holes 108 of bolts 106 in each PTC flexible heater are in threaded connection with the top ends of the telescopic rods 112, the bottom ends of the telescopic rods 112 are connected with the connecting sleeves 114, the pressing springs 113 are respectively sleeved on each telescopic rod 112, the elastic deformation steel bars 111 are cylindrical and are provided with two, the elastic deformation steel bars 111 are transversely arranged, the elastic deformation steel bars 111 at the front side penetrate through the connecting sleeves 114 at the front side, the elastic deformation steel bars 111 at the rear side penetrate through the connecting sleeves 114 at the rear side, the limit nuts 115 are respectively in threaded connection with the two ends of each elastic deformation steel bar 111, the intelligent wearing built-in threading holes 116 are respectively arranged at the two ends of each elastic deformation steel bar 111, the intelligent wearing equipment is a PTC constant temperature physiotherapy nursing belt, the PTC flexible heater is placed in the cloth cover inside the intelligent wearing equipment, the two elastic deformation steel bars 111 are fixed in a mode that the connecting wire passes through the intelligent wearing built-in threading hole 116, at the moment, the PTC flexible heater is fixed in the intelligent wearing equipment, the limit nut 115 prevents the connecting sleeve 114 from being separated from the elastic deformation steel bars 111, therefore, the installation protection frame 104 is stably positioned above the elastic deformation steel bars 111, the upper side of the PTC flexible heater is close to a human body, the pressing spring 113 enables the telescopic rod 112 to have a stretching trend, thereby promoting the action end of the upper side of the PTC flexible heater to be close to the human body, facilitating the PTC flexible heater to play a role, the elastic deformation steel bars 111 are also bent along with the outline of the human body when the intelligent wearing equipment is close to the bending of the human body, the elastic deformation steel bars 111 and the bending degree of the FPC can be allowed to be differentiated through the telescopic rod 112 and the pressing spring 113, the design redundancy is large, and the service life can be prolonged;
the FPC middle part breaking prevention assembly 12 comprises mounting sleeves 121, set screws 122, long plates 123, pressurizing springs 124 and pressurizing discs 125, wherein the front and rear positions of the two elastic deformation steel bars 111 corresponding to the middle part of the lower insulating pad 101 are respectively sleeved with the mounting sleeves 121, the set screws 122 are respectively connected in screw holes on the two mounting sleeves 121 in a threaded manner, the set screws 122 are connected with the corresponding elastic deformation steel bars 111, the mounting sleeves 121 are fixed on the elastic deformation steel bars 111 through the set screws 122 and do not displace, long plates 123 are fixedly connected between the two front and rear corresponding mounting sleeves 121, the bottom ends of the three pressurizing springs 124 are connected with the long plates 123 through connecting columns at equal intervals in the longitudinal direction, the pressurizing discs 125 are connected with the pressurizing discs 125 under the elastic force of the pressurizing springs 124, the pressurizing discs 125 are tightly attached to the middle part of the lower insulating pad 101, the pressurizing springs 124 are mounted on the long plates 123 in a matched manner, and the middle part of the FPC is pressed upwards through the lower insulating pad 101, and the middle part of the FPC is stressed downwards when the upper side of the FPC is in a curved surface part of a human body, so that the middle part is easy to break, the upper part is applied with the upward buffering force of the FPC, and the upper part of the FPC can be effectively prevented from being broken;
the linking assembly 13 comprises an elastic deformation piece 131 and a clamping seat 132, the elastic deformation piece 131 can be an elastic sheet or a spring piece, two ends of the elastic deformation piece 131 are respectively connected with the clamping seat 132, two clamping seats 132 are respectively connected with the corresponding side edges of the installation protection frame 104 in a clamping mode, adjacent PTC flexible heaters are linked through the elastic deformation piece 131 and the clamping seat 132, the gap piece between the two PTC flexible heaters is smooth when the intelligent wearing equipment formed by the PTC flexible heaters is bent flexibly, the intelligent wearing equipment is not stressed and then is straightened by means of elastic deformation steel bars 111, and at the moment, the elastic deformation piece 131 is restored to be in situ, and the edges of the two adjacent PTC flexible heaters are realigned through the clamping seat 132.
Intelligent wearable device characteristics using PTC flexible heater:
1. the ceramic PTC element is heated, has no open flame, is not easy to burn, has high safety and is environment-friendly;
2. combines modern intelligent wearing and traditional Chinese medicine 'warm therapy' concepts, is internally provided with lithium batteries with ultra-low voltage power supply, has no electric shock risk, is safe and portable, and continuously carries out warm physiotherapy on focus acupuncture points (the optimal physiotherapy temperature of a human body is 42 ℃);
3. can be worn next to the skin, does not influence normal work, and can effectively relieve and prevent discomfort of neck and shoulder pain, lumbago and leg pain, cold stomach, cold womb and other parts after long-term use;
4. easy to unpick and wash and clean;
the foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (4)
1. The preparation method of the flexible PTC heater for intelligent wearing is characterized by comprising the following preparation steps of:
a. preparation of a sheet type PTC element: preparing 100 parts of PTC porcelain and 15-30 parts of adhesive into slurry according to parts by weight, and then carrying out the process flows of casting, laminating, cutting, sintering and electrode terminating to obtain a sheet type PTC element;
b. FPC pretreatment, fixing and printing: before SMT, pre-baking FPC, cooling, precisely fixing FPC on a carrier plate, and printing conductive adhesive joints by adopting a conductive paste type printer with an optical positioning system;
c. SMD mounting and curing: the chip PTC element is attached to two corresponding bonding points on the designed FPC, and then ultraviolet light source irradiation crosslinking is adopted, so that the chip PTC element and the FPC are solidified and connected into a whole;
d. and (3) mounting a split board and a USB terminal: the FPC is provided with a plurality of same circuit units, the FPC is cut into a plurality of independent heaters through a partition plate after being attached, and finally, a USB terminal is arranged on each independent heater, so that the PTC flexible heater is finally obtained;
the porcelain of the sheet type PTC element comprises the following materials: baCO 3 、SrCO 3 、TiO 2 、Y 2 O 3 、SiO 2 And Mn (NO) 3 ) 2 ；
The conductive adhesive adopts ultraviolet curing type epoxy conductive adhesive, the type of the epoxy conductive adhesive is E-51, and the epoxy conductive adhesive comprises 100 parts of epoxy resin, 15 parts of flexible curing agent and 250 parts of 300-mesh silver powder according to parts by weight;
the preparation method of the epoxy conductive adhesive comprises the following steps: firstly mixing epoxy resin and acetone, then adding silver powder, stirring uniformly, then adding a flexible curing agent, stirring uniformly, then heating to 120 ℃ and curing after two hours;
the FPC is respectively provided with a U-shaped cathode copper electrode and a U-shaped anode copper electrode, the cathode copper electrode and the anode copper electrode are oppositely arranged, the horizontal part at the front end of the cathode copper electrode is positioned at the inner side of the anode copper electrode, the horizontal part at the rear end of the anode copper electrode is positioned at the inner side of the cathode copper electrode, a row of sheet PTC elements are transversely and equidistantly arranged between the horizontal part at the rear end of the anode copper electrode and the horizontal part at the rear end of the cathode copper electrode, another row of sheet PTC elements are transversely and equidistantly arranged between the horizontal part at the front end of the anode copper electrode and the horizontal part at the front end of the cathode copper electrode, the sheet PTC elements are longitudinally arranged, the arrangement direction of the sheet PTC elements is mutually perpendicular to the bending direction of the PTC flexible heater during operation, and two ends of the sheet PTC elements are respectively connected with the cathode copper electrode and the anode copper electrode through conductive adhesive;
an adhesion enhancing groove is formed in the FPC and located at the position of the conductive adhesive joint, conductive adhesive is filled in the adhesion enhancing groove, and adhesion teeth are uniformly arranged on the inner wall of the adhesion enhancing groove; the FPC is characterized by further comprising notches, wherein the notches are transverse rectangular through grooves, notches are formed in the FPC and located between two rows of sheet type PTC elements at equal distance in the transverse direction, and two ends of the notches are semicircular.
2. The method for manufacturing the flexible PTC heater for intelligent wearing according to claim 1, wherein the PTC flexible heater further comprises a heat transfer component, the heat transfer component comprises a heat conducting rubber pad, a metal heat conducting piece, a ventilation groove and a connecting convex edge, the metal heat conducting piece is sleeved on each piece of PTC element respectively, a bottom groove of the heat conducting rubber pad is connected with the metal heat conducting piece in a matched mode, the ventilation groove is formed in the top of the heat conducting rubber pad in a longitudinal and transverse mode, and the square connecting convex edge is arranged on the side edge of the bottom of the heat conducting rubber pad.
3. The method for manufacturing the flexible PTC heater for intelligent wearing according to claim 2, further comprising a protective mounting assembly, wherein the protective mounting assembly comprises a lower insulating pad, an upper insulating pad, a breathable mesh, a mounting protective frame, a fixing flange, bolts, nuts and mounting threaded holes, the lower insulating pad is arranged on the lower side of the FPC, the fixing flange is arranged on the side edge of the lower insulating pad, the upper insulating pad is arranged on the upper side of the FPC, the upper insulating pad is arranged between the FPC and the heat-conducting rubber pad, rectangular through grooves corresponding to the sheet type PTC elements are formed in the upper insulating pad, the breathable mesh is laid on the upper side of the heat-conducting rubber pad, the breathable mesh, the heat-conducting rubber pad, the upper insulating pad, the FPC and the lower insulating pad form a flexible plate group, the mounting protective frame is sleeved on the side edge of the flexible plate group, the mounting protective frame is made of rubber materials, clamping grooves are respectively formed in the upper end and lower end of the inner side of the mounting protective frame, the bolts are inserted in the through holes in four corners of the mounting protective frame, the bolts sequentially penetrate through the breathable mesh, the heat-conducting rubber pad, the upper insulating pad, the holes in the four corners of the FPC and the lower insulating pad are connected with the nuts through the bottom threads, and the nuts are vertically penetrated through the mounting threaded holes.
4. The method for manufacturing the flexible PTC heater for intelligent wear according to claim 3, further comprising an intelligent wear built-in mounting unit, an FPC middle breakage preventing assembly and a smooth connection assembly, wherein adjacent PTC flexible heaters are connected together through the intelligent wear built-in mounting unit, the FPC middle breakage preventing assembly corresponding to the PTC flexible heater bottom center is provided on the intelligent wear built-in mounting unit, and two adjacent PTC flexible heaters are connected through at least three smooth connection assemblies.
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| CN202310106148.2A CN115835430B (en) | 2023-02-13 | 2023-02-13 | Preparation method of flexible PTC heater for intelligent wearing |
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| EP2236330B1 (en) * | 2009-03-30 | 2011-09-28 | Eberspächer catem GmbH & Co. KG | Electric heater for a motor vehicle |
| CN204425679U (en) * | 2014-11-26 | 2015-06-24 | 天津瑞肯新型材料科技有限公司 | Stepless temperature-regulating PTC heater and the wearable device with its heating |
| CN106227025B (en) * | 2016-09-27 | 2018-05-18 | 深圳市奋达科技股份有限公司 | The manufacturing method of integral intelligent watch |
| CN209105494U (en) * | 2018-09-07 | 2019-07-12 | 深圳市伯莱科电子有限公司 | A kind of intelligent wearable device flexible circuit board |
| CN213327877U (en) * | 2020-10-21 | 2021-06-01 | 江西创亿电子有限公司 | Intelligent electroplating equipment is used in production of FPC flexible circuit board |
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Non-Patent Citations (1)
| Title |
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| FPC 表面贴装工艺探讨;杨飞;2009中国高端SMT学术会议论文集;120-125 * |
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