Slider cover for zipper and injection molding process thereof

Abstract

The present invention relates to the technical field of zipper production, and specifically to a slider cover for a zipper and an injection molding process thereof, characterized in that: it comprises an upper cover plate and a lower cover plate arranged at the upper and lower parts, a connecting column for connecting the upper cover plate and the lower cover plate is provided between the front parts thereof, the connecting column comprises a connecting part located in the center thereof, the connecting part comprises a connecting hole penetrating the upper and lower ends of the upper cover plate and a clamping column fixedly arranged at the upper end of the lower cover plate and protruding upward, a clamping block protruding outward is fixedly arranged on the inner surfaces of the left and right sides of the connecting hole, a downward pressure avoiding groove concave inward is provided on the outer surfaces of the left and right sides of the clamping column, and a clamping block is formed on the left and right sides of the top of the clamping column. The present invention can make the combination between the upper cover plate and the lower cover plate more firm, and it is not easy to break the two apart, effectively ensuring the integrity of the slider cover, not easy to be damaged, and can be used normally for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of zipper production, and in particular to a slider cover for a zipper and an injection molding process thereof. Background Art

[0002] As a functional connector in clothing design, the zipper has the characteristics of simple structure and convenient use, wide application and large consumption. However, during use, the zipper puller is easy to clamp the fabrics on both sides into the zipper puller during the closing and zipping process, causing the zipper puller to be stuck and unable to move, and at the same time, it will damage the fabrics, causing great inconvenience to the user. For this reason, some puller covers have appeared on the market, which are used to cover the zipper puller to play an anti-clamping role during the closing and zipping process. However, during the use of some existing puller covers, the connection stability of the connection point between the upper cover plate and the lower cover plate is relatively general, and it is easy to be broken apart and damaged, which affects normal use. Therefore, it is necessary to further improve the structure of the existing puller cover and its injection molding process. However, the injection mold and injection molding process of the existing zipper are mostly applied to the zipper puller. Therefore, how to make a strong and not easy to be broken apart puller cover through the injection molding process is the problem to be solved by this application. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a slider cover for a zipper and its injection molding process, which can make the connection between the upper cover plate and the lower cover plate more secure and not easy to break the two apart, effectively ensure the integrity of the slider cover, is not easy to be damaged, and can be used normally for a long time.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: a slider cover for a zipper, comprising an upper cover plate and a lower cover plate arranged at the top and the bottom, a connecting column for connecting the two together is provided between the front portions of the upper cover plate and the lower cover plate, the connecting column comprises a connecting portion located in the center thereof, the connecting portion comprises a connecting hole passing through the upper and lower ends of the upper cover plate and a clamping column fixedly arranged at the upper end of the lower cover plate and protruding upward, a clamping block protruding outward is fixedly provided on the inner surfaces of the left and right sides of the connecting hole, a downward pressure avoidance groove concave inwardly is provided on the outer surfaces of the left and right sides of the clamping column, and clamped blocks are formed on the left and right sides of the top of the clamping column, in the process of inserting the clamping column upward from the bottom of the connecting hole, the two clamping blocks can respectively apply downward extrusion force to the two clamped blocks and make the two clamped blocks both bend downward elastically, and when the clamping column is inserted into place, the two clamped blocks can bounce upward to reset and be clamped and engaged with the two clamping blocks one by one up and down.

[0005] Furthermore, the connecting column also includes a coupling portion located around it, the coupling portion includes an upper annular coupling block formed at the lower end of the upper cover plate and protruding downward, and a lower annular coupling block formed at the upper end of the lower cover plate and protruding upward. When the clamping column is inserted into place, the lower annular coupling plane of the upper annular coupling block abuts and combines with the upper annular coupling plane of the lower annular coupling block. The front side surface of the coupling portion is a concave surface, and a mosaic structure is provided on the front side of the coupling portion. The mosaic structure includes mutually compatible embedding blocks and embedding grooves. The lower end of the front side of the upper annular coupling block protrudes downward and is formed with at least one embedding block, and the upper end of the front side of the lower annular coupling block is recessed downward and is formed with at least one embedding groove.

[0006] Furthermore, the connecting hole is rectangular when observed from the top and bottom, the upper surface of the clamping block is the upper clamping plane, and the lower surface of the clamping block is the lower guiding slope, the lower guiding slope is downward and inclined toward the direction of the inner surface of the corresponding side of the connecting hole, the lower edge line of the lower guiding slope coincides with the bottom edge line corresponding to the connecting hole, and the lower surface of the clamped block includes a lower clamping plane and a downward pressing slope which are arranged in sequence from the outside to the inside, the downward pressing slope is upward and inclined toward the side away from the lower clamping plane and makes the clamped block present a right-angled trapezoidal shape that is thick on the outside and thin on the inside.

[0007] Furthermore, the inner top surface of the downward pressure avoidance groove is the lower surface of the clamped block, and the inner bottom surface of the downward pressure avoidance groove includes an inner concave arc surface, a first outer convex arc surface, an avoidance slope and a second outer convex arc surface which are sequentially connected from the inside to the outside. The avoidance slope is arranged parallel to the lower guide slope, and a semicircular arc surface is provided at the connection between the inner top surface and the inner bottom surface of the downward pressure avoidance groove.

[0008] Furthermore, the clamping column is rectangular when observed from the top and bottom, the width of the clamping column is adapted to the width of the connecting hole, the upper end surface of the clamping column is a complete surface and is adapted to and overlaps with the upper end surface of the upper cover plate, and filling blocks are fixedly provided on the inner surface of the connecting hole directly above the two clamping blocks, and the spacing between the two filling blocks is adapted to the length of the clamping column.

[0009] Furthermore, a receiving cavity for receiving the slider and opening rearward is formed between the upper cover plate and the lower cover plate behind the clamping column, and chain tooth channels connected to the receiving cavity are respectively arranged on the left and right sides of the clamping column. The lower end surface of the upper cover plate is provided with an upper mounting cavity which is recessed upward and matched with the upper wing plate of the slider and opening rearward; the lower end surface of the lower cover plate is provided with a lower mounting cavity which is recessed downward and matched with the lower wing plate of the slider and opening rearward; an upper avoidance window which is communicated with the upper mounting cavity and is used to expose the upper pull-tab mounting part of the slider; and a lower avoidance window which is communicated with the lower mounting cavity and is used to expose the lower pull-tab mounting part of the slider.

[0010] Furthermore, upper support portions are provided on both sides of the rear end of the upper cover plate, an upper avoidance slot is formed between the two upper support portions, the two upper support portions both protrude rearward and gradually expand to make the upper avoidance slot present an isosceles trapezoidal shape that is narrow in the front and wide in the back, and lower support portions are provided on both sides of the rear end of the lower cover plate corresponding to the upper support portions one by one, a lower avoidance slot is provided between the two lower support portions, the two lower support portions both protrude rearward and gradually expand to make the lower avoidance slot present an isosceles trapezoidal shape that is narrow in the front and wide in the back.

[0011] The injection molding process of the slider cover includes the following steps:

[0012] Step 1, weigh the first raw material component according to the following weight ratio: polycarbonate 65-75%, thermoplastic elastomer 15-25%, glass fiber 5-10%, toughening agent 3-6%, compatibilizer 1-3%, antioxidant 0.1-0.5%, lubricant 0.5-1.5%, and mix them thoroughly to form a mixture, weigh the second raw material component according to the following weight ratio: thermoplastic elastomer 100%, to form a single material, and dry the mixture and the single material at a temperature of 80-100 degrees for 2-3 hours respectively;

[0013] Step 2, heating the first injection molding barrel in the first injection molding system to 190°C-240°C, heating the first hot runner in the first injection molding system to 180°C-230°C, and heating the injection mold to 50°C-80°C;

[0014] Step 3, adding the dried mixed material into the first injection molding barrel in the first injection molding system, and heating the mixed material to a molten state, and then injecting the molten mixed material into the heated injection mold through the guidance of the first hot runner in the first injection molding system to achieve one-time injection molding;

[0015] Step 4: Perform a pressure holding treatment on the injection mold for 4-10 seconds;

[0016] Step 5: cool and mold the upper cover plate and the lower cover plate semi-finished product in the injection mold for 5-15 seconds, and make sure that the lower cover plate semi-finished product has residual temperature after cooling, and the temperature value of the residual temperature is 50-70 degrees.

[0017] Step 6, heating the second injection molding barrel in the second injection molding system to 190°C-240°C, and heating the second hot runner in the second injection molding system to 180°C-230°C;

[0018] Step 7, adding the dried single material into the second injection molding barrel in the second injection molding system, and heating it to a molten single melt, and then injecting the molten single melt into the lower cover plate semi-finished product with residual temperature through the guidance of the second hot runner in the second injection molding system to achieve secondary injection molding;

[0019] Step 8: Perform secondary pressure holding treatment on the injection mold, and the pressure holding time is 2-5 seconds;

[0020] Step 9: Perform secondary cooling and molding on the upper cover plate and the lower cover plate with an elastic skeleton in the injection mold, and the cooling and molding time is 5-15s;

[0021] Step 10: demoulding to obtain the finished upper cover plate and the lower cover plate with an elastic frame, and subsequently assembling the upper cover plate and the lower cover plate to obtain the slider cover.

[0022] Furthermore, the injection mold includes an upper mold, a middle mold, a lower mold, a first mold core block and a second mold core needle tube, the middle mold is a fixed mold, the upper mold and the lower mold are both movable molds, the upper mold, the middle mold and the lower mold are arranged in sequence from top to bottom and cooperate with each other, the upper mold is provided with a first molding groove, the middle mold is provided with a second molding groove and a third molding groove arranged up and down, the lower mold is provided with a fourth molding groove, the first mold core block and the second mold core needle tube can be detachably installed on the middle mold and are located in the third molding groove, the first mold core block is two and is symmetrically arranged at intervals, the first molding groove and the second molding groove cooperate with each other to form an upper cover plate molding cavity, and the upper end of the upper mold is provided with A first feed port connected to the upper cover plate molding cavity and used for injecting mixed molten material, a third molding groove, a fourth molding groove, a second core needle tube and two first core blocks cooperate to form a lower cover plate molding cavity, a second feed port connected to the lower cover plate molding cavity and used for injecting mixed molten material is provided at the lower end of the lower mold, when a lower cover plate semi-finished product is formed in the lower cover plate molding cavity and the second core needle tube is moved out of the lower cover plate semi-finished product to be demolded, an elastic skeleton molding cavity can be formed in the lower cover plate semi-finished product with the cooperation of the inner wall of the middle mold and the second core needle tube, and a feed channel connected to the elastic skeleton molding cavity and used for injecting a single molten material is provided in the second core needle tube.

[0023] Furthermore, in the process that the second mold core needle tube is moved out of the lower cover plate semi-finished product and demoulded, a single molten material is simultaneously injected into the elastic skeleton forming mold cavity in the lower cover plate semi-finished product.

[0024] From the above description, it can be known that the slider cover for the zipper and the injection molding process thereof provided by the present invention have the following beneficial effects: by providing downward pressure avoidance grooves on the outer surfaces of the left and right sides of the clamping column, it is convenient to form clamped blocks on the left and right sides of the top of the clamping column, that is, the clamped blocks are located directly above the corresponding downward pressure avoidance grooves, so that the clamped blocks can have avoidance space for elastic bending downward. In this way, when the clamping column is inserted upward from the bottom of the connecting hole, due to the downward extrusion force exerted by the two clamping blocks on the two clamped blocks, the two clamped blocks can both produce corresponding elastic deformation and gradually bend downward, so that the two clamped blocks at the top of the clamping column are The spacing between the outer sides of the clamped blocks gradually decreases so that the two clamped blocks on the top of the clamping column can pass through between the two clamping blocks. When the clamping column is inserted into place, the two clamped blocks just pass between the two clamping blocks. At this time, since there is no downward squeezing force from the clamping blocks and due to the elastic deformation of the clamped blocks themselves, the two clamped blocks can bounce upward and reset, thereby being clamped and engaged with the two clamping blocks one by one, effectively ensuring the firmness of the two when they are engaged and making it difficult to pry apart the upper cover plate and the lower cover plate, effectively ensuring the integrity of the slider cover, making it difficult to be damaged and able to be used normally for a long time, so as to better ensure the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a three-dimensional structural schematic diagram of a slider cover for a zipper according to the present invention.

[0026] Figure 2 The figure is a schematic structural diagram of a slider cover for a zipper according to the present invention.

[0027] Figure 3 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the upper cover plate.

[0029] Figure 5 It is a schematic diagram of the structure of the upper cover plate.

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the lower cover plate.

[0031] Figure 7 It is a schematic diagram of the structure of the lower cover plate.

[0032] Figure 8 The present invention is a schematic structural diagram of a slider cover for a zipper when a slider is installed.

[0033] Fig. 9 Schematic diagram of the structure of the injection mold.

[0034] Fig.10 This is a schematic diagram of the structure of the injection mold after completing one injection molding.

[0035] Fig.11 It is a schematic diagram of the local structure of a clamping column with an elastic skeleton.

[0036] In the figure: 1-upper cover plate; 11-upper installation cavity; 12-upper avoidance window; 13-upper support part; 14-upper avoidance slot; 2-lower cover plate; 21-lower installation cavity; 22-lower avoidance window; 23-lower support part; 24-lower avoidance slot; 3-connecting column; 4-connecting part; 41-connecting hole; 411-clamping block; 4111-upper clamping plane; 4112-lower guiding inclined plane; 412-filling block; 42-clamping column; 421-downward pressure avoidance slot; 4211-inner concave arc surface; 4212-first outer convex arc surface; 4213-avoidance inclined plane; 4214-second outer convex arc surface; 4215-semicircular arc surface; 422-clamped block; 4221-lower clamping plane; 4222-downward pressure inclined plane; 423-full The whole surface; 424-elastic skeleton; 5-joining part; 51-upper annular joining block; 511-lower annular joining plane; 52-lower annular joining block; 521-upper annular joining plane; 53-concave surface; 54-engaging structure; 541-embedded block; 542-embedded groove; 61-accommodating cavity; 62-chain tooth channel; 7-puller; 71-upper wing plate; 72-lower wing plate; 73-upper pull-tab mounting part; 74-lower pull-tab mounting part; 81-upper mold; 811-first feed port; 82-middle mold; 83-lower mold; 831-second feed port; 84-first core block; 85-second core needle tube; 851-feeding channel; 86-upper cover plate molding cavity; 87-lower cover plate molding cavity; 88-elastic skeleton molding cavity. DETAILED DESCRIPTION

[0037] The present invention is further described below through specific implementation modes.

[0038] like Figures 1 to 11 As shown, the slider cover for a zipper described in the present invention includes an upper cover plate 1 and a lower cover plate 2 arranged upper and lower, and a connecting column 3 for connecting the upper cover plate 1 and the lower cover plate 2 is provided between the front parts of the upper cover plate 1 and the lower cover plate 2, and the connecting column 3 includes a connecting portion 4 located in the center and a connecting portion 5 located around it.

[0039] The connecting portion 4 includes a connecting hole 41 that passes through the upper and lower ends of the upper cover plate 1 and a clamping column 42 that is fixedly arranged on the upper end of the lower cover plate 2 and protrudes upward. The inner surfaces of the left and right sides of the connecting hole 41 are fixedly provided with clamping blocks 411 that protrude outward. The two clamping blocks 411 are symmetrically arranged. The outer surfaces of the left and right sides of the clamping column 42 are provided with inwardly concave downward pressure avoidance grooves 421, and the left and right sides of the top of the clamping column 42 are formed with clamped blocks 422. The two The downward pressure avoidance groove 421 and the two clamped blocks 422 are symmetrically arranged. When the clamping column 42 is inserted upward from the bottom of the connecting hole 41, the two clamping blocks 411 can respectively apply downward extrusion force to the two clamped blocks 422 and make the two clamped blocks 422 elastically bend downward. When the clamping column 42 is inserted into place, the two clamped blocks 422 can bounce upward to reset and be clamped and engaged with the two clamping blocks 411 one by one.

[0040] Since the slider cover is fixed on the slider 7 when in use, it does not need to be opened during subsequent use. By providing the downward pressure avoidance grooves 421 on the left and right outer surfaces of the clamping column 42, it is convenient to form the clamped blocks 422 on the left and right sides of the top of the clamping column 42, that is, the clamped blocks 422 are located directly above the corresponding downward pressure avoidance grooves 421, so that the clamped blocks 422 have an avoidance space for elastic bending downwards. In this way, when the clamping column 42 is inserted upward from the bottom of the connecting hole 41, due to the two clamping The downward extrusion force exerted by the block 411 on the two clamped blocks 422 can cause the two clamped blocks 422 to produce corresponding elastic deformation and gradually bend downward, so that the distance between the outer sides of the two clamped blocks 422 at the top of the clamping column 42 is gradually reduced, so that the two clamped blocks 422 at the top of the clamping column 42 can pass through between the two clamping blocks 411. When the clamping column 42 is inserted into place, the two clamped blocks 422 just pass through between the two clamping blocks 411. At this time, since there is no downward extrusion of the clamping block 411 The two clamped blocks 422 are retracted and retracted to form a resilient connection, and the two clamped blocks 411 are retracted and retracted to form a resilient connection, so that the two clamped blocks 411 are retracted and retracted to form a resilient connection, so that the two clamped blocks 42 ... The squeezing force causes the two clamped blocks 422 to have a tendency to bend upward elastically. However, in the initial state, the distance between the bottom edges of the outer sides of the two clamped blocks 422 increases, so that the bottom edges of the outer sides of the clamped blocks 422 first come into contact and interfere with the top inner surface of the connecting hole 41, and the two clamped blocks 422 are stuck. The harder they are pried apart, the tighter the two clamped blocks 422 are stuck at the top opening of the connecting hole 41, so that the improved slider cover is difficult to be pried apart and is not easily damaged by accident.

[0041] The coupling portion 5 comprises an upper annular coupling block 51 formed at the lower end of the upper cover plate 1 and protruding downward, and a lower annular coupling block 52 formed at the upper end of the lower cover plate 2 and protruding upward. When the clamping column 42 is inserted into place, the lower annular coupling plane 511 of the upper annular coupling block 51 abuts and couples with the upper annular coupling plane 521 of the lower annular coupling block 52, thereby realizing the upper and lower mutual limiting effect between the upper annular coupling block 51 and the lower annular coupling block 52, and at the same time, the engagement between the clamping block 411 and the clamped block 422 can further ensure the firmness of the connection between the upper cover plate 1 and the lower cover plate 2. The front side surface of the coupling portion 5 is a concave surface 53, so that when the slider 7 is moved along the meshing direction, there is a gap between a pair of chain teeth of the zipper. In the case of cloth, the cloth will move toward the concave surface 53, so that the cloth is not easily bitten into, which can play a good positive anti-pinch effect. The front side of the coupling part 5 is provided with a chimeric structure 54, and the chimeric structure 54 includes a mutually adapted embedding block 541 and an embedding groove 542. The lower end of the front side of the upper annular coupling block 51 protrudes downward and is formed with at least one of the embedding blocks 541. The upper end of the front side of the lower annular coupling block 52 is recessed downward and is formed with at least one embedding groove 542. The embedding block 541 is embedded in the embedding groove 542, thereby playing a corresponding mutual limiting role in the left and right directions between the upper annular coupling block 51 and the lower annular coupling block 52, so as to further improve the stability of the coupling part 5 when coupled. Preferably, the embedding block 541 and the embedding groove 542 are both two and spaced apart.

[0042] The connecting hole 41 is rectangular when viewed from the top and bottom. The upper surface of the clamping block 411 is an upper clamping plane 4111, and the lower surface of the clamping block 411 is a lower guiding slope 4112. The lower guiding slope 4112 is inclined downward and toward the inner surface of the corresponding side of the connecting hole 41. Through the guiding effect of the lower guiding slope 4112, when the clamping column 42 is inserted upward from the bottom of the connecting hole 41, the clamped block 422 can be gradually squeezed downward, and the clamped block 422 can be gradually elastically bent downward to further ensure the smooth insertion of the clamping column 42. The lower edge line of the lower guiding slope 4112 coincides with the bottom edge line corresponding to the connecting hole 41, thereby making the lower The guiding bevel 4112 has a larger guiding angle and a longer guiding length to better guide the insertion of the clamping column 42. The lower surface of the clamped block 422 includes a lower clamping plane 4221 and a downward pressing bevel 4222 which are sequentially connected from the outside to the inside. The lower clamping plane 4221 can be well clamped and fit with the upper clamping plane 4111 to better ensure the stability of the interlocking connection between the clamping block 411 and the clamped block 422. The downward pressing bevel 4222 is inclined upward and toward one side away from the lower clamping plane 4221 and makes the clamped block 422 present a right-angled trapezoidal shape with a thick outside and a thin inside, so that the clamped block 422 has a better downward elastic bending effect on the clamping column 42.

[0043] Correspondingly, the inner top surface of the downward pressure avoidance groove 421 is the lower surface of the clamped block 422, and the inner bottom surface of the downward pressure avoidance groove 421 includes an inner concave arc surface 4211, a first outer convex arc surface 4212, an avoidance slope 4213 and a second outer convex arc surface 4214 which are sequentially connected from the inside to the outside, and the avoidance slope 4213 is arranged in parallel with the lower guide slope 4112. Therefore, through the setting of the inner concave arc surface 4211, while ensuring that the downward pressure avoidance groove 421 has a larger avoidance space, the upper and middle part of the clamping column 42 can have better structural strength. Through the setting of the first outer convex arc surface 4212, a corresponding transition effect can be played between the inner concave arc surface 4211 and the avoidance slope 4213. Through the setting of the avoidance slope 4213, when the clamping column 42 is inserted upward from the bottom of the connecting hole 41, the interference between the lower side wall of the clamping column 42 and the clamping block 411 in the connecting hole 41 can be effectively avoided, so as to better ensure the smooth insertion of the clamping column 42. Through the setting of the second outer convex arc surface 4214, a corresponding transition effect can be played between the avoidance slope 4213 and the lower side surface of the clamping column 42. A semicircular arc surface 4215 is provided at the connection between the inner top surface and the inner bottom surface of the downward pressure avoidance groove 421, thereby playing a good arc transition effect between the inner top surface and the inner bottom surface of the downward pressure avoidance groove 421, and can further reduce the stress at the connection between the inner top surface and the inner bottom surface of the downward pressure avoidance groove 421.

[0044] The clamping column 42 is rectangular when observed from the top and bottom directions, the width of the clamping column 42 is adapted to the width of the connecting hole 41, and the upper end face of the clamping column 42 is a complete surface 423 and is adapted to and overlaps with the upper end face of the upper cover plate 1, that is, by arranging the two downward pressure avoidance grooves 421 on the left and right outer surfaces of the clamping column 42, the integrity of the upper end face of the clamping column 42 will not be affected, and the upper end face of the clamping column 42 can be combined with the upper end face of the upper cover plate 1 to form a relatively complete surface, effectively ensuring that the slider cover is intact after assembly. The body shape is beautiful, and it is not easy for things to get stuck in the connecting hole 41. In addition, a filling block 412 is fixedly provided on the inner surface of the connecting hole 41 just above the two clamping blocks 411, that is, at this time, the top opening size of the connecting hole 41 is smaller than the bottom opening size of the connecting hole 41, and the spacing between the two filling blocks 412 is adapted to the length of the clamping column 42, thereby further reducing the gap between the top of the clamping column 42 and the upper cover plate 1, so that the upper end surface of the clamping column 42 and the upper end surface of the upper cover plate 1 have a better overlap.

[0045] A receiving cavity 61 for receiving the slider 7 and opening to the rear is formed between the upper cover plate 1 and the lower cover plate 2 behind the clamping column 42, and a chain tooth channel 62 connected to the receiving cavity 61 is respectively provided on the left and right sides of the clamping column 42, and an upper mounting cavity 11 is provided on the lower end surface of the upper cover plate 1, which is recessed upward and matched with the upper wing plate 71 of the slider 7 and opened to the rear, and a lower mounting cavity 11 is provided on the lower end surface of the lower cover plate 2, which is recessed downward and matched with the lower wing plate 72 of the slider 7 and opened to the rear. The upper mounting cavity 11 and the lower mounting cavity 21 are respectively formed as the inner top and the inner bottom of the receiving cavity 61. The upper cover plate 1 is provided with an upper avoidance window 12 which is communicated with the upper mounting cavity 11 and is used to expose the upper pull-tab mounting portion 73 of the slider 7. The inner circumference of the upper avoidance window 12 is equidistant from the inner circumference of the upper mounting cavity 11, so that the contour of the upper avoidance window 12 is similar to the contour of the upper wing plate 71 of the slider 7 and is proportional. The lower cover plate 2 is provided with a lower avoidance window 22 which is communicated with the lower mounting cavity 21 and is used to expose the lower pull-tab mounting portion 74 of the slider 7. The inner circumference of the lower avoidance window 22 is equidistant from the inner circumference of the lower mounting cavity 21. The contour of the lower avoidance window 22 is similar to the contour of the lower wing plate 72 of the slider 7 and is proportionally reduced. The lower pull-tab of the slider 7 has a larger movable space. By utilizing the settings of the upper mounting cavity 11 and the upper avoidance window 12, the upper cover plate 1 can well surround and press the four peripheral edges of the upper wing plate 71 of the slider 7. By utilizing the settings of the lower mounting cavity 21 and the lower avoidance window 22, the lower cover plate 2 can well surround and press the four peripheral edges of the lower wing plate 72 of the slider 7, thereby making the installation of the slider 7 between the upper cover plate 1 and the lower cover plate 2 more stable.

[0046] The left and right sides of the rear end of the upper cover plate 1 are provided with upper expansion parts 13, and an upper avoidance slot 14 is formed between the two upper expansion parts 13. The two upper expansion parts 13 both protrude backwards and gradually expand, so that the upper avoidance slot 14 is in the shape of an isosceles trapezoid that is narrow in front and wide in the back. The left and right sides of the rear end of the lower cover plate 2 are provided with lower expansion parts 23 corresponding to the upper expansion parts 13 one by one, and a lower avoidance slot 24 is provided between the two lower expansion parts 23. The two lower expansion parts 23 both protrude backwards and gradually expand, so that the lower avoidance slot 24 is in the shape of an isosceles trapezoid that is narrow in front and wide in the back. Through the arrangement of the upper expansion parts 13 and the lower expansion parts 23, when the slider 7 is pulled backwards and moves in the separation direction of the zipper, the fabrics on both sides can be well expanded or pulled apart, thereby playing a corresponding reverse anti-pinch effect, effectively preventing the zipper from causing the two sides to be clamped during the separation process. The zipper puller 7 is provided with a plurality of zipper pulls, and the zipper puller 7 is provided with a plurality of zipper pulls, and the zipper pulls are ...

[0047] The injection molding process of the slider cover includes the following steps:

[0048] Step 1, weigh the first raw material component according to the following weight ratio: polycarbonate 65-75%, thermoplastic elastomer 15-25%, glass fiber 5-10%, toughening agent 3-6%, compatibilizer 1-3%, antioxidant 0.1-0.5%, lubricant 0.5-1.5%, and mix them thoroughly to form a mixture, weigh the second raw material component according to the following weight ratio: thermoplastic elastomer 100%, to form a single material, and dry the mixture and the single material at a temperature of 80-100 degrees for 2-3 hours respectively;

[0049] Step 2, heating the first injection molding barrel in the first injection molding system to 190°C-240°C, heating the first hot runner in the first injection molding system to 180°C-230°C, and heating the injection mold to 50°C-80°C;

[0050] Step 3, adding the dried mixed material into the first injection molding barrel in the first injection molding system, and heating the mixed material to a molten state, and then injecting the molten mixed material into the heated injection mold through the guidance of the first hot runner in the first injection molding system to achieve one-time injection molding;

[0051] Step 4: Perform a pressure holding treatment on the injection mold for 4-10 seconds;

[0052] Step 5: cool and mold the semi-finished upper cover plate 1 and lower cover plate 2 in the injection mold for 5-15 seconds, and make sure that the semi-finished lower cover plate 2 has residual temperature after cooling, and the temperature value of the residual temperature is 50-70 degrees.

[0053] Step 6, heating the second injection molding barrel in the second injection molding system to 190°C-240°C, and heating the second hot runner in the second injection molding system to 180°C-230°C;

[0054] Step 7, adding the dried single material into the second injection molding barrel in the second injection molding system, and heating it to a single melt in a molten state, and then injecting the single melt in a molten state into the lower cover plate 2 semi-finished product with residual temperature through the guidance of the second hot runner in the second injection molding system to achieve secondary injection molding;

[0055] Step 8: Perform secondary pressure holding treatment on the injection mold, and the pressure holding time is 2-5 seconds;

[0056] Step nine, the finished upper cover plate 1 and the lower cover plate 2 with the elastic skeleton 424 in the injection mold are subjected to secondary cooling and molding, and the cooling and molding time is 5-15s;

[0057] Step 10: Demolding to obtain the finished upper cover plate 1 and the lower cover plate 2 with the elastic skeleton 424, and subsequently assembling the upper cover plate 1 and the lower cover plate 2 to obtain the slider cover.

[0058] The polycarbonate is used to provide a strength and rigidity foundation to ensure the basic structural strength and dimensional stability of the finished product. The thermoplastic elastomer is used to increase the toughness and elasticity of the material and has good resilience and fatigue resistance. The glass fiber is used to enhance the strength and dimensional stability of the material. The toughening agent is used to improve the toughness of the material. The compatibilizer is used to improve the compatibility between the polycarbonate and the thermoplastic elastomer and enhance the blending effect. The antioxidant is used to prevent oxidation and aging of the material during processing and use. The lubricant is used to reduce the friction between the material and the mold and improve the processing performance. In this way, the upper cover plate 1 and the lower cover plate 2 produced can have good strength and rigidity, and at the same time, the lower cover plate 2, especially the top of the clamping column 42, has corresponding toughness and elasticity, so that when the clamping column 42 is inserted upward from the bottom of the connecting hole 41, the two clamped blocks 422 can be squeezed to achieve corresponding elastic bending.

[0059] Example 1 of the first raw material component: 69% polycarbonate, 18% thermoplastic elastomer, 6% glass fiber, 4% toughening agent, 2% compatibilizer, 0.3% antioxidant, and 0.7% lubricant; Example 2 of the first raw material component: 65% polycarbonate, 21% thermoplastic elastomer, 5% glass fiber, 5% toughening agent, 3% compatibilizer, 0.2% antioxidant, and 0.8% lubricant; Example 3 of the first raw material component: 74% polycarbonate, 15% thermoplastic elastomer, 6% glass fiber, 3% toughening agent, 1% compatibilizer, 0.4% antioxidant, and 0.6% lubricant.

[0060] The injection mold comprises an upper mold 81, a middle mold 82, a lower mold 83, a first mold core block 84 and a second mold core needle tube 85, the middle mold 82 is a fixed mold, the upper mold 81 and the lower mold 83 are both movable molds, the upper mold 81, the middle mold 82 and the lower mold 83 are arranged in sequence from top to bottom and cooperate with each other, the upper mold 81 is provided with a first molding groove, the middle mold 82 is provided with a second molding groove and a third molding groove arranged up and down, the lower mold 83 is provided with a fourth molding groove, the first mold core block 84 and the second mold core needle tube 85 can be detachably installed on the middle mold 82 and are located in the third molding groove, the first mold core block 84 is two and is symmetrically arranged at intervals, the first molding groove and the second molding groove cooperate with each other to form an upper cover plate molding cavity 86, the upper mold 8 The upper end of the middle mold 82 is provided with a first feed port 811 which is communicated with the upper cover plate molding cavity 86 and is used for injecting mixed molten material. The third molding groove, the fourth molding groove, the second mold core needle tube 85 and the two first mold core blocks 84 cooperate to form a lower cover plate molding cavity 87. The lower end of the lower mold 83 is provided with a second feed port 831 which is communicated with the lower cover plate molding cavity 87 and is used for injecting mixed molten material. When the lower cover plate 2 semi-finished product is formed in the lower cover plate molding cavity 87 and the second mold core needle tube 85 is demoulded from the lower cover plate 2 semi-finished product, an elastic skeleton molding cavity 88 can be formed in the lower cover plate 2 semi-finished product under the cooperation of the inner wall of the middle mold 82 and the second mold core needle tube 85. The second mold core needle tube 85 is provided with a feed channel 851 which is communicated with the elastic skeleton molding cavity 88 and is used for injecting a single molten material.

[0061] As a result, the mixed molten material is injected into the upper cover plate molding cavity 86 and the lower cover plate molding cavity 87 respectively to complete a primary injection molding, thereby facilitating the molding of the upper cover plate 1 and the lower cover plate 2. Then, when the second mold core needle tube 85 is moved out of the semi-finished product of the lower cover plate 2 and demolded, a single molten material is injected into the elastic skeleton molding cavity 88 to complete a secondary injection molding, thereby facilitating the molding of the elastic skeleton 424 in the lower cover plate 2. The elastic skeleton 424 is molded at the top of the clamping column 42 of the lower cover plate 2 and passes through the two clamped blocks 422. The secondary injection molding can be completed without removing the lower cover plate 2 and replacing other injection molds, thereby effectively improving production efficiency. Preferably, the elastic skeleton 424 is cylindrical, thereby further improving the elastic bending ability of the top of the clamping column 42 and the two clamped blocks 422, so as to better ensure that the clamping column 42 is smoothly inserted into the connecting hole 41.

[0062] In addition, by providing the two first mold core blocks 84 , two downward pressure avoidance grooves 421 are formed on the lower cover plate 2 after demolding.

[0063] In the process of the second mold core needle tube 85 moving out of the lower cover plate 2 semi-finished product, a single molten material is simultaneously injected into the elastic skeleton forming cavity 88 in the lower cover plate 2 semi-finished product, thereby enabling the single molten material to be better injected and fully fill the elastic skeleton forming cavity 88, so as to form a complete elastic skeleton 424. In addition, correspondingly, one end of the second mold core needle tube 85 is slidably connected to the middle mold 82 and a sliding sealing ring is provided between the two. When the second mold core needle tube 85 is moved out of the lower cover plate 2 semi-finished product, It will not be disconnected from the middle mold 82. In addition, the second core mold needle tube 85 can be installed on a corresponding guide frame, and the guide frame is connected to a corresponding mobile driving device to drive the second core mold needle tube 85 to move through the mobile driving device. Correspondingly, the mobile driving device is a hydraulic cylinder, a pneumatic cylinder or an electric push rod. In addition, in other embodiments, after the second core mold needle tube 85 is completely moved out of the semi-finished product of the lower cover plate 2 and demolded, a single molten material can be injected into the elastic skeleton forming cavity 88 in the semi-finished product of the lower cover plate 2.

[0064] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A slider cover for a zipper, comprising an upper cover plate and a lower cover plate arranged at the upper and lower parts, wherein a connecting column for connecting the upper cover plate and the lower cover plate is provided between the front parts thereof, and characterized in that: The two cams have the form of a hole, a groove, and a groove, on the top of the two cams are formed to form a circle, on the left and right sides of the two cams are connected with the groove, and the groove is connected with the groove to form a circle. The locking plate is an angular channel formed between a pair of camming axes and a pair of camming axes, and the two sides of the camming axes are connected by a plurality of locking plates, each of which is a plurality of locking plates with a plurality of locking plates having a plurality of locking plates.

2. The slider cover for a zipper according to claim 1, characterized in that: The connecting column also includes a coupling portion located around it, and the coupling portion includes an upper annular coupling block formed at the lower end of the upper cover plate and protruding downward, and a lower annular coupling block formed at the upper end of the lower cover plate and protruding upward. When the clamping column is inserted into place, the lower annular coupling plane of the upper annular coupling block abuts and couples with the upper annular coupling plane of the lower annular coupling block. The front side surface of the coupling portion is a concave surface, and a chimeric structure is provided on the front side of the coupling portion. The chimeric structure includes mutually adapted embedded blocks and embedded grooves. The lower end of the front side of the upper annular coupling block protrudes downward and is formed with at least one of the embedded blocks, and the upper end of the front side of the lower annular coupling block is recessed downward and is formed with at least one of the embedded grooves.

3. The slider cover for a zipper according to claim 1, characterized in that: The clamping column is rectangular when viewed from the top and bottom, the width of the clamping column is matched with the width of the connecting hole, the upper end surface of the clamping column is a complete surface and is matched with and overlaps with the upper end surface of the upper cover plate, and filling blocks are fixedly provided on the inner surface of the connecting hole just above the two clamping blocks, and the spacing between the two filling blocks is matched with the length of the clamping column.

4. The slider cover for a zipper according to claim 1, characterized in that: A receiving cavity for receiving the slider and opening rearward is formed between the upper cover plate and the lower cover plate behind the clamping column, and chain tooth channels connected to the receiving cavity are respectively arranged on the left and right sides of the clamping column, and the lower end surface of the upper cover plate is provided with an upper mounting cavity which is recessed upward, matched with the upper wing plate of the slider and opening rearward, and the lower end surface of the lower cover plate is provided with a lower mounting cavity which is recessed downward, matched with the lower wing plate of the slider and opening rearward, an upper avoidance window which is communicated with the upper mounting cavity and is used to expose the upper pull-tab mounting part of the slider, and a lower avoidance window which is communicated with the lower mounting cavity and is used to expose the lower pull-tab mounting part of the slider.

5. The slider cover for a zipper according to claim 1, characterized in that: Upper support parts are provided on both sides of the rear end of the upper cover plate, and an upper avoidance slot is formed between the two upper support parts. The two upper support parts both protrude backwards and gradually expand to make the upper avoidance slot present an isosceles trapezoidal shape that is narrow in front and wide in the back. Lower support parts corresponding to the upper support parts are provided on both sides of the rear end of the lower cover plate, and a lower avoidance slot is provided between the two lower support parts. The two lower support parts both protrude backwards and gradually expand to make the lower avoidance slot present an isosceles trapezoidal shape that is narrow in front and wide in the back.

6. An injection molding process for a slider cover, used for injection molding the slider cover for a zipper according to any one of claims 1 to 5, characterized in that: The steps include: Step 1, weigh the first raw material component according to the following weight ratio: polycarbonate 65-75%, thermoplastic elastomer 15-25%, glass fiber 5-10%, toughening agent 3-6%, compatibilizer 1-3%, antioxidant 0.1-0.5%, lubricant 0.5-1.5%, and mix them thoroughly to form a mixture, weigh the second raw material component according to the following weight ratio: thermoplastic elastomer 100%, to form a single material, and dry the mixture and the single material at a temperature of 80-100 degrees for 2-3 hours respectively; Step 2, heating the first injection molding barrel in the first injection molding system to 190°C-240°C, heating the first hot runner in the first injection molding system to 180°C-230°C, and heating the injection mold to 50°C-80°C; Step 3, adding the dried mixed material into the first injection molding barrel in the first injection molding system, and heating the mixed material to a molten state, and then injecting the molten mixed material into the heated injection mold through the guidance of the first hot runner in the first injection molding system to achieve one-time injection molding; Step 4: Perform a pressure holding treatment on the injection mold for 4-10 seconds; Step 5: cool and mold the upper cover plate and the lower cover plate semi-finished product in the injection mold for 5-15 seconds, and make sure that the lower cover plate semi-finished product has residual temperature after cooling, and the temperature value of the residual temperature is 50-70 degrees. Step 6, heating the second injection molding barrel in the second injection molding system to 190°C-240°C, and heating the second hot runner in the second injection molding system to 180°C-230°C; Step 7, adding the dried single material into the second injection molding barrel in the second injection molding system, and heating it to a molten single melt, and then injecting the molten single melt into the lower cover plate semi-finished product with residual temperature through the guidance of the second hot runner in the second injection molding system to achieve secondary injection molding; Step 8: Perform secondary pressure holding treatment on the injection mold, and the pressure holding time is 2-5 seconds; Step 9: Perform secondary cooling and molding on the upper cover plate and the lower cover plate with an elastic skeleton in the injection mold, and the cooling and molding time is 5-15s; Step 10: demoulding to obtain the finished upper cover plate and the lower cover plate with an elastic frame, and subsequently assembling the upper cover plate and the lower cover plate to obtain the slider cover.

7. The injection molding process of the slider cover according to claim 6, characterized in that: The injection mold comprises an upper mold, a middle mold, a lower mold, a first mold core block and a second mold core needle tube, the middle mold is a fixed mold, the upper mold and the lower mold are both movable molds, the upper mold, the middle mold and the lower mold are arranged in sequence from top to bottom and cooperate with each other, the upper mold is provided with a first molding groove, the middle mold is provided with a second molding groove and a third molding groove arranged up and down, the lower mold is provided with a fourth molding groove, the first mold core block and the second mold core needle tube can be detachably installed on the middle mold and are located in the third molding groove, the first mold core block is two and is symmetrically arranged at intervals, the first molding groove and the second molding groove cooperate with each other to form an upper cover plate molding cavity, the upper mold The upper end is provided with a first feed port which is communicated with the upper cover plate molding cavity and is used for injecting mixed molten material. The third molding groove, the fourth molding groove, the second core needle tube and the two first core blocks cooperate to form a lower cover plate molding cavity. The lower end of the lower mold is provided with a second feed port which is communicated with the lower cover plate molding cavity and is used for injecting mixed molten material. When a lower cover plate semi-finished product is formed in the lower cover plate molding cavity and the second core needle tube is moved out of the lower cover plate semi-finished product to be demolded, an elastic skeleton molding cavity can be formed in the lower cover plate semi-finished product under the cooperation of the inner wall of the middle mold and the second core needle tube. The second core needle tube is provided with a feed channel which is communicated with the elastic skeleton molding cavity and is used for injecting a single molten material.

8. The injection molding process of the slider cover according to claim 7, characterized in that: During the process that the second mold core needle tube is moved out of the lower cover plate semi-finished product and demoulded, a single molten material is simultaneously injected into the elastic skeleton forming mold cavity in the lower cover plate semi-finished product.

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