CN114801068A

CN114801068A - TPU foaming injection molding shoe material mold

Info

Publication number: CN114801068A
Application number: CN202210524003.XA
Authority: CN
Inventors: 陈金水; 陈文平; 陈贵强; 陈文锋; 陈碧梅; 陈杉培
Original assignee: Fengte Fujian New Material Technology Co ltd
Current assignee: Fengte Fujian New Material Technology Co ltd
Priority date: 2022-05-14
Filing date: 2022-05-14
Publication date: 2022-07-29

Abstract

The utility model relates to a TPU foaming shoes material mould of moulding plastics, relate to mould technical field, it includes upper die base and die holder, be provided with the die cavity arm in the die holder, be formed with lower die cavity in the die cavity arm, be provided with the die cavity in the upper die base, lower die cavity communicates with each other with last die cavity and forms the cavity of watering of pouring, the periphery of die cavity arm encircles and is formed with the colloidal sol passageway, the array distribution has the multiple spot to advance gluey mouth on the die cavity arm, the colloidal sol passageway advances gluey mouth through the multiple spot and pours the cavity of watering and be linked together, it is provided with the multiple spot exhaust hole of being convenient for evenly to exhaust in the last die cavity. This application advances gluey even injection of mouth through the multiple spot and pours the cavity into for it is the same to pour every position sol velocity of flow in the cavity into, and stress is comparatively dispersed, when pouring into, through the even outside exhaust of multiple spot exhaust hole, guarantees that the shoes material is pouring the cavity shaping effectually in notes, and whole practicality is strong, has great market spreading value.

Description

TPU foaming injection molding shoe material mold

Technical Field

The application relates to the technical field of molds, in particular to a TPU foaming injection molding shoe material mold.

Background

TPU-is a thermoplastic polyurethane elastomer for short, which is a high molecular material prepared by the common reaction and polymerization of diisocyanate molecules such as toluene diisocyanate or diphenylmethane diisocyanate, macromolecular polyol and low molecular polyol (chain extender). The composite material has the advantages of good comprehensive mechanical property, excellent antimicrobial erosion resistance, good hydrolysis resistance, good grease resistance, good low temperature resistance, good heat resistance and good chemical resistance, and especially has outstanding wear resistance.

At present, TPU has excellent performance and is often used for manufacturing soles. The sole mould is one of indispensable instrument of preparation sole, and the quality of sole mould directly influences sole finished product quality and production efficiency. Most of the existing TPU injection molding shoe material molds on the market adopt a single-channel glue inlet structure to be injected into a cavity for molding.

Aiming at the related technologies, the inventor thinks that the single-channel glue inlet structure causes the flow rate of the injection molding cavity to be uneven and stress concentration to be larger, so that the foaming effect of the finished shoe material is not uniform, and the quality of the whole shoe material is influenced.

Disclosure of Invention

In order to improve the inhomogeneous problem of the mould cavity velocity of flow of casting is brought to current shoes material mould structure of moulding plastics, stress concentration is great, leads to finished product shoes material foaming effect inhomogeneous, the purpose of this application is to provide TPU foaming shoes material mould of moulding plastics.

The application provides a TPU foaming shoes material mould of moulding plastics adopts following technical scheme:

the TPU foaming injection molding shoe material mould comprises an upper mould base and a lower mould base, wherein a cavity arm is arranged in the lower mould base, a lower cavity is formed in the cavity arm, and an upper cavity is arranged in the upper mould base;

the lower cavity is communicated with the upper cavity to form an injection cavity, the periphery of the cavity arm is surrounded to form a sol channel, a plurality of glue inlets are arrayed on the cavity arm, and the sol channel is communicated with the injection cavity through the plurality of glue inlets;

and a multi-point exhaust hole convenient for uniform exhaust is arranged in the upper cavity.

By adopting the technical scheme, TPU injection molding sol in the sol channel is injected into the injection casting cavity through the multiple points to enable the flow rate of the sol at each position in the injection casting cavity to be the same, the stress is dispersed, and the shoe material is guaranteed to be good in injection casting cavity forming effect through the uniform outward exhaust of the multiple points of exhaust holes when the injection casting is carried out.

Optionally, the sol channel is a single-phase mixed sol channel.

By adopting the technical scheme, the single-phase mixed sol adopts a supercritical foaming forming process, before the TPU sol is injected into the sol channel, other gases such as carbon dioxide or nitrogen in a supercritical state are injected into a special external plasticizing device, so that the TPU sol and the carbon dioxide or nitrogen in the supercritical state are fully and uniformly mixed and diffused to form the single-phase mixed sol, then the sol flows through the sol channel and is injected into the injection cavity, the sol in the injection cavity generates large pressure drop, the gas is separated out to form a large amount of bubble nuclei, in the subsequent cooling forming process, the sol bubble nuclei in the injection cavity continuously grow and are formed, and finally the plastic shoe material with uniform pores and more uniformly distributed stress is obtained.

Optionally, the multi-point glue inlets are distributed on the cavity arm in a mesh-shaped flow channel.

By adopting the technical scheme, the multipoint glue inlet is designed into a net-shaped flow channel structure, so that TPU (thermoplastic polyurethane) sol can uniformly enter the casting cavity, the flowing time of the sol in the casting cavity is shortened, the local stress is reduced, and the forming effect of the sol in the casting cavity is good.

Optionally, the sol channel is provided with a set of, accomplishes injection moulding simultaneously for a pair of shoes material respectively, one side of sol channel corresponds and is formed with a set of mouth that supports that communicates each other.

Through adopting above-mentioned technical scheme, shoes material mould can realize the shaping of one pair of soles of same mould simultaneously through setting up a set of sol passageway on upper die base and die holder, and production efficiency is very fast, has replaced traditional mould all to be the production drawback of a mould, and the injecting glue pipe connection by outside is in butt mouth department when the sol passageway pours into TPU colloidal sol into.

Optionally, a glue injection pipe is arranged at the abutting port, the glue injection pipe includes a main rubber pipe and an auxiliary rubber pipe, and the single-phase mixed sol in the main rubber pipe flows into the two sol channels through the auxiliary rubber pipe respectively.

Through adopting above-mentioned technical scheme, the shoes material mould is provided with a set of sol passageway, and is corresponding, in the vice glue pipe of the interior sol branch flow direction of the main glue pipe of injecting glue pipe, vice glue pipe is provided with two, and its output overlap joint is in the butt mouth department of corresponding sol passageway department respectively.

Optionally, a converging cavity communicated with the multi-point exhaust hole is arranged in the upper die base, and a converging port is arranged at an output end of the converging cavity.

Through adopting above-mentioned technical scheme, the sol of pouring in the cavity is at the fashioned in-process, through the even outside exhaust in multiple spot exhaust hole, for guaranteeing multiple spot exhaust hole carminative environmental protection and runner optimization, the top that lies in the multiple spot exhaust hole in the upper die base is provided with assembles the chamber, and the gaseous unified one-class of multiple spot exhaust hole combustion gas is to assembling the intracavity, and the outside discharge is unified to the rethread mouth that converges.

Optionally, an exhaust pipe is arranged at the junction, the exhaust pipe includes a main exhaust pipe and an auxiliary exhaust pipe, and gas in the junction is conveyed into the main exhaust pipe along the auxiliary exhaust pipe.

Through adopting above-mentioned technical scheme, the mouth that converges department sets up on the body of upper die base, and for the convenience of the gaseous circulation, the mouth that converges is provided with a set ofly, and every mouth that converges is connected with the blast pipe, and gaseous earlier outwards carries the back unified emission that converges to the main exhaust pipe through vice blast pipe when carrying gas.

Optionally, the lower die base is provided with a plurality of guide pillars, and the upper die base is provided with limiting holes matched with the guide pillars.

Through adopting above-mentioned technical scheme, through the location fit between guide pillar and the spacing hole, upper die base and die holder can guarantee steady compound die and die sinking when opening and shutting, ensure shoes material shaping quality.

In summary, the present application includes at least one of the following beneficial technical effects:

1.TPU injection molding sol in the sol channel is uniformly injected into the injection cavity through the multipoint glue inlet, so that the sol flow rate at each position in the injection cavity is the same, the stress is relatively dispersed, and the TPU injection molding sol is uniformly exhausted outwards through the multipoint exhaust holes during injection, so that the shoe material is ensured to have good molding effect in the injection cavity;

2. the multipoint glue inlet is designed into a net-shaped flow channel structure, so that TPU (thermoplastic polyurethane) sol can uniformly enter the casting cavity, the flowing time of the sol in the casting cavity is shortened, and the local stress is reduced;

3. the single-phase mixed sol is injected during injection molding, other gases such as carbon dioxide or nitrogen in a supercritical state are injected into a special external plasticizing device, the TPU sol and the carbon dioxide or nitrogen in the supercritical state are fully and uniformly mixed and diffused to form the single-phase mixed sol, and then the sol flows through a sol channel and is injected into an injection cavity, so that the bottom pores of the shoe material are uniform.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is an exploded schematic view of an embodiment of the present application;

FIG. 3 is a schematic structural view of a lower die holder according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a die holder according to an embodiment of the present application;

FIG. 5 is a schematic top view of the structure corresponding to FIG. 4;

fig. 6 is a cross-sectional view corresponding to a-a in fig. 5.

Description of reference numerals:

100. an upper die holder; 110. an upper cavity; 120. a multi-point vent; 130. a convergence cavity; 140. a flow converging port; 150. an exhaust pipe; 151. a main exhaust pipe; 152. a secondary exhaust pipe; 160. a limiting hole;

200. a lower die holder; 210. a lower cavity; 220. a cavity arm; 230. pouring a cavity; 240. a sol channel; 250. a multipoint glue inlet; 260. abutting the interface; 270. a glue injection pipe; 271. a main rubber pipe; 272. an auxiliary rubber tube; 280. and (6) a guide pillar.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

Example (b): the TPU foaming injection molding shoe material mold comprises an upper mold base 100 and a lower mold base 200, the upper mold base 100 and the lower mold base 200 are of square structures with the same overall dimension, a group of cavity arms 220 are arranged in the lower mold base 200, a lower cavity 210 for glue injection molding is formed on the inner side of each group of cavity arms 220, and an upper cavity 110 matched with and provided with the cavity arms 220 is arranged in the upper mold base 100. When the upper die holder 100 and the lower die holder 200 are assembled, the lower cavity 210 is communicated with the upper cavity 110 to form a glue injection cavity. The periphery of cavity arm 220 encircles and is formed with sol passageway 240, the bottom surface of sol passageway 240 is parallel and level with the bottom of injecting glue cavity mutually, the array distributes on the wall thickness of cavity arm 220 has the multiple spot of being netted runner structure to advance jiao kou 250, the cross-section that the multiple spot advances jiao kou 250 is circular structure, the multiple spot of netted runner structure advances jiao kou 250 and is convenient for TPU sol even entering to water cavity 230, reduce the flow time of the interior sol of cavity 230 of watering, reduce local stress simultaneously, the sol is effectual in the shaping of cavity 230 of watering. The TPU sol in the sol channel 240 permeates into the glue injection cavity through the multipoint glue inlet 250.

It should be noted that the TPU sol in the sol channel 240 is a single-phase mixed sol, the single-phase mixed sol is formed by a supercritical foam molding process, and before the TPU sol is injected into the sol channel 240, other external supercritical carbon dioxide or nitrogen and other gases are injected into a special external plasticizing device (not shown in the figure), so that the TPU sol and the supercritical carbon dioxide or nitrogen are fully and uniformly mixed and diffused to form the single-phase mixed sol. The single-phase mixed sol is injected into the casting cavity 230 after flowing through the sol channel 240, so that the sol in the casting cavity 230 generates a large pressure drop, and a large amount of bubble nuclei are formed by gas precipitation. In the subsequent cooling and forming process, the sol bubble nuclei inside the casting cavity 230 are continuously grown and formed, and finally the plastic shoe material with uniform pores and more uniformly distributed stress is obtained.

Referring to fig. 2 and 3, the input port of each group of sol channel 240 is provided with a butt joint 260, the butt joint 260 is communicated with the sol channel 240, the glue injection pipe 270 is installed at the butt joint 260, the glue injection pipe 270 comprises a main rubber pipe 271 and two auxiliary rubber pipes 272, the two auxiliary rubber pipes 272 are respectively lapped at the two butt joint 260, the input ends of the auxiliary rubber pipes 272 are jointly connected to the main rubber pipe 271, the single-phase mixed sol in the main rubber pipe 271 flows through the two auxiliary rubber pipes 272 respectively, and the simultaneous injection molding of shoe materials into the two glue injection cavities is completed.

Referring to fig. 4 and 5, guide posts 280 are arranged at four right-angle sides of the lower die base 200, and a limiting hole 160 matched with the guide posts 280 is correspondingly arranged on the upper die base 100, so that when the lower die base 200 and the upper die base 100 are assembled, stable assembly and disassembly of the dies are ensured through self-positioning guiding of the guide posts 280 and the limiting holes 160, and the forming quality of shoe materials is ensured.

Referring to fig. 5 and 6, a multi-point exhaust hole 120 for uniformly exhausting air is formed in the top of the upper cavity 110, the cross section of the multi-point exhaust hole 120 is a circular structure, a convergence cavity 130 is formed in the upper portion, located at the multi-point exhaust hole 120, of the upper cavity 110, the gas emitted from the multi-point exhaust hole 120 uniformly flows into the convergence cavity 130, two confluence ports 140 are formed in one side, located at the upper die holder 100, of the convergence cavity 130, an exhaust pipe 150 for discharging the gas outside is installed at the output end of the reflux ports, the exhaust pipe 150 includes a main exhaust pipe 151 and two auxiliary exhaust pipes 152, two auxiliary exhaust pipes 152 are respectively overlapped at the two confluence ports 140, and the output ends of the auxiliary exhaust pipes 152 are jointly connected into the main exhaust pipe 151 to achieve uniform outward exhaust.

The implementation principle of the embodiment of the application is as follows: when the injection molding machine is used for injection molding, gas is blown in through the glue injection pipe 270, air flows through the glue injection cavity and then flows through the exhaust pipe 150 through the convergence cavity 130 to be discharged outwards, so that the vacuumizing process is realized, foreign particle treatment in the glue injection cavity is performed, and the discharged air enables TPU single-phase mixed sol to be free from oxidation reaction in the injection molding process to influence the shoe material molding quality. Respectively injecting carbon dioxide or nitrogen in a supercritical state and TPU sol into an external plasticizing device, the TPU sol and the corresponding gas are mixed and diffused to form single-phase mixed sol, the single-phase mixed sol respectively flows through the auxiliary rubber tube 272 through the main rubber tube 271 and reaches the two sol channels 240, the single-phase mixed sol in the sol permeates into a glue injection cavity formed by the matched die of the upper die holder 100 and the lower die holder 200 through the multi-point glue inlet 250 of the reticular runner on the die cavity arm 220, the TPU sol can conveniently and uniformly enter the casting cavity 230 through the multi-point glue inlet 250 with the reticular runner, the flowing time of the sol in the casting cavity 230 is reduced, meanwhile, the local stress is reduced, in the process of forming in the glue injection cavity, the multi-point exhaust holes 120 uniformly exhaust outwards, the effect of the whole forming process of the shoe material is guaranteed to be good, the forming defect caused by the local heat dissipation problem is avoided, and the gas in the multi-point exhaust holes 120 flows into the convergence cavity 130 uniformly and is discharged outwards through the exhaust pipe 150.

The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

The TPU foaming injection molding shoe material mold comprises an upper mold base (100) and a lower mold base (200), wherein a cavity arm (220) is arranged in the lower mold base (200), a lower cavity (210) is formed in the cavity arm (220), and an upper cavity (110) is arranged in the upper mold base (100), and is characterized in that:

the lower cavity (210) is communicated with the upper cavity (110) to form an injection casting cavity (230), the periphery of the cavity arm (220) is surrounded by a sol channel (240), multiple points of glue inlets (250) are distributed on the cavity arm (220) in an array manner, and the sol channel (240) is communicated with the injection casting cavity (230) through the multiple points of glue inlets (250);

and a multi-point exhaust hole (120) convenient for uniform exhaust is arranged in the upper cavity (110).
2. The TPU foam injection molding shoe material mold of claim 1, characterized in that: the sol channel (240) is a single-phase mixed sol channel (240).
3. The TPU foam injection molding shoe material mold of claim 1, characterized in that: the multipoint glue inlets (250) are distributed on the cavity arm (220) in a reticular flow channel manner.
4. The TPU foam injection molding shoe material mold of claim 1, characterized in that: the sol channel (240) is provided with a group of sol channels, which are respectively a pair of shoe materials and simultaneously complete injection molding, and one side of the sol channel (240) is correspondingly provided with a group of abutting ports (260) which are communicated with each other.
5. The TPU foaming injection molding shoe material mold of claim 4, characterized in that: the glue injection pipe (270) is arranged at the joint (260), the glue injection pipe (270) comprises a main rubber pipe (271) and an auxiliary rubber pipe (272), and single-phase mixed sol in the main rubber pipe (271) flows into the two sol channels (240) through the auxiliary rubber pipe (272) respectively.
6. The TPU foam injection molding shoe material mold of claim 1, characterized in that: the multi-point exhaust hole die is characterized in that a convergence cavity (130) communicated with the multi-point exhaust hole (120) is arranged in the upper die holder (100), and a confluence port (140) is arranged at the output end of the convergence cavity (130).
7. The TPU foaming injection molding shoe material mold of claim 6, characterized in that: an exhaust pipe (150) is arranged at the confluence opening (140), the exhaust pipe (150) comprises a main exhaust pipe (151) and an auxiliary exhaust pipe (152), and gas in the confluence opening (140) is conveyed into the main exhaust pipe (151) along the auxiliary exhaust pipe (152).
8. The TPU foam injection molding shoe material mold of claim 1, characterized in that: the lower die holder (200) is provided with a plurality of guide posts (280), and the upper die holder (100) is provided with limiting holes (160) matched with the guide posts (280).