CN2324829Y - Shoe last formation by air assisted jetting - Google Patents

Abstract

The utility model relates to a shoe last head formed by air assisted jetting, comprising a body having a shoe-shaped periphery. The body comprises a shoe heel part and a shoe bottom part, and an air chamber is arranged in the body along length direction. The air chamber formed by air assisted jetting is used for forming a hollow structure having a uniform side wall in order to lighten the weight of the shoe last head and prevent surface contraction and warping deformation. Production cost can be reduced, the structure of the shoe last head is enhanced, and the utility model conforms to the requirement of environmental protection due to recovery and reuse.

Description

The last of gas auxiliary jet formation

The utility model relates to a kind of last, refers to a kind of last of gas auxiliary jet formation especially.

Shoe tree (Shoe Last) is for keeping the used model of shoe-shaped when making shoes, it roughly can be divided into solid last and two intercept form activity shoe last or hat blocks (as shown in Figure 3) according to different demands, generally speaking, the section person of representing is that (for example it is formal footwear for the function of footwear body after the shoe tree, playshoes or healthy shoe etc.), and the moulding of the popular lines of the purposes that leading portion is brought into play system deflection, now determine the soul of shoes moulding because of the global shape system of shoe tree, and be the indispensable aid of shoemaking, so shoe tree design and cost consideration are that the shoemaking dealer desires one of technical task of asking important breakthrough.

Specially being manufactured on the Material Selection of system shoe last (lasts) roughly is divided into wooden shoe last or hat block and aluminum shoe last or hat block.It is made that wooden shoe last or hat block is taken from the tree material that quality is hard, density is high, texture is careful, the lighter also moulding easily of this kind material, but non-refractory, moisture-sensitive, and can't reclaim system, moreover it need prevent when using that toluene from infiltrating and vamp is bonded at footwear body and shoe last can't be broken away from again.The aluminum shoe last or hat block then is to be the shoe last or hat block heart with the wood last earlier, casts through founding again, though speed is very fast during fabrication for this material, cost is lower, and recyclable system again, can only be confined to use the shoes making machine operation, for the manual rather difficulty of group of tying.So American-European dealer changes the wooden of tradition or aluminum shoe tree, and replacing by plastics (HDPE makes by high density poly propylene) shoe last high temperature resistant and moisture, only this plastics shoe last also will produce following critical defect:

(1) because shoe last is the solid plastic body, and the very big thickness of tool very easily causes finished product cooldown rate inequality, causes the surface and systolic depression occurs, influences the apparent size accuracy, the back processing of must going is again handled;

(2) overall weight of product very big (about every two about 2KG) is all inconvenient in carrying and the use;

(3) if when the integral thickness of shoe last structure is extremely inhomogeneous, will cause the warpage and the distortion of finished product;

(4) if the size of required shoe last structure is long, owing to need the structure of cast will make and penetrate the decline of straightening line, can't effectively transmit pressure and carry out pressurize because of too far away from sprue (Sprue), cause the lump in the abdomen defect on product appearance and the structure; And

(5) process-cycle of product extremely long, need 10-15 minute approximately.

Therefore, a last product is if will have high temperature resistant and humidity concurrently, high structural strength, in light weight and attractive in appearance outside shape (warpage does not cave in), on the development and Design of product now, not only be subject to the back increase of process time, and the cost of product is improved, cause the relevant greatest shortcoming of dealer.Under the surging situation of the shortage of manpower and cost consciousness now, and under quality and the cost international environment all with keen competition, this last remains to be improved.

The purpose of this utility model, be to provide a kind of last of gas auxiliary jet formation, can cooperate the emission technology of gas assistant formation, make that high-purity nitrogen is able to promote melting polymer (moulding material) along the shoe last length direction, produce air chamber among this shoe last, impel any systolic depression of surperficial unlikely generation (sink) of last product, and then make finished size more accurate, it is easier to make, process time after reducing, reduce cost, and quality is more stable, has no defective in appearance.

Secondary objective of the present utility model, tie up to the last that a kind of gas auxiliary jet formation is provided, by the reinforcing function that air chamber caused in the shoe last, can prevent any depression, warpage and the distortion of last structure, product structure intensity is significantly improved, prolong the service life of shoe tree, and increase the design space of shoe tree profile, improve the chance of the popular variation of shoes profile.

Another purpose of the present utility model, tying up to provides a kind of last of gas auxiliary jet formation structure, by the design of air chamber in the shoe last, makes last form hollow structure, to alleviate the overall weight of about 30-40%, makes carrying and operation convenient more; And can reduce the production cycle by this, improve product quality, and then increase the competitiveness of product.

The technical solution of the utility model is:

A kind of last of gas auxiliary jet formation comprises:

One body comprises one and has periphery outside the shoe-shaped profile, and this body comprises a footwear heel and divides and a sole portion; It is characterized in that:

This body is provided with one and is formed at its interior air chamber along its length direction.

The last of described gas auxiliary jet formation is characterized in that:

This air chamber is the periphery contour along this body, is located within this body, makes this body form to have the hollow structure of an even limit wall.

Effect of the present utility model is:

Can significantly reduce the required material that expends, and therefore can alleviate the weight of shoe last finished product, reduce producing cost, can significantly promote the structural strength of whole last again, increase the design space of last profile variation simultaneously.

Hereinafter, will more can understand the structure and the characteristic of this creation with reference to the embodiment explanation of accompanying drawing:

Fig. 1 system demonstrates the last section of structure of this creation air chamber position;

Fig. 2 system demonstrates the shaping of this creation last and is prepended to structural profile schematic diagram in the mould; And

Fig. 3 is the schematic perspective view of two intercept form Movable lasts of Prior Art.

Consulting Fig. 1, is the last 1 of this creation gas auxiliary jet formation, and it comprises a body 10, and body 10 comprises one and has periphery 11 outside the shoe-shaped profile, and body 10 comprises a footwear heel in addition and divides 12 and one sole portion 13.

Referring to Fig. 2, this creation last is to utilize gas auxiliary jet formation (Gas-Assisted Injection Molding) technology to be finished, it is earlier melting polymer (polymer) (promptly to be injected by sprue sprue21 by a standard filling system, flow to main running channel main runner22, flow into sprue gate gate23 again) inject in the die cavity, when not filling with (or before just filling with) fully at this polymer, wait for 0 to 1 second short time, with high-purity and via the nitrogen (N of volume or pressure control ₂), via aforementioned running channel 21,22, exerting pressure enters sprue gate 23, has slower cooldown rate by the polymer of die cavity thicker part (as heel part after the last 1), makes this nitrogen (N ₂) from shoe last 1 sole portion 13 rears of the best,,, push the melting polymer open along periphery 11 profiles of body 10 via the length direction of a slide block type air tube 24 along shoe last 1, form complete air chamber 30.For the high pressure nitrogen that passes through via air tube 24 can not being blown the melting polymer wear when forming air chamber 30 and still having a suitable limit wall thickness, this polymer injects the necessary and accurately control of time delay system that injecting of die cavity and this nitrogen promotes between polymer, and the melting plastics that contact with die cavity limit wall need carry out pressurize equably.At this moment, this last 1 body 10 is at the wall thicker part, unlikely generation systolic depression (sink), and at the wall thin location, because to the grazing shot pressure place away from sprue 21, more unlikely generation weak point is penetrated (short shot) infull phenomenon, makes its easier complete moulding by the auxiliary melting polymer that promotes of gas.And nitrogen (N ₂) part of flowing through promptly forms the works of similar " hollow ", not only can alleviate the weight of whole last 1, reduce to penetrate and press and clamp force, and nitrogen (N ₂) part of flowing through also has the function of similar reinforcement, can strengthen overall structure, prevents warpage and distortion.Treat whole shoe last 1 cooling forming in mould, after the nitrogen discharge program, promptly can knock pin 25 finished product be ejected from the position.

Preamble system is described herein at the preferred embodiment of the solid last head of this creation, for being familiar with this top operator, when can under the know-why that does not break away from this creation, doing various variations and application, for example the solid last formula hollow last structure with Fig. 1 changes the prior art two intercept form activity shoe last or hat blocks of adopting with as Fig. 3 40, and again will be wherein movable two intercept form shoe lasts 41,42 also adopt respectively and design with hollow gas chamber.

Claims (2)

1, a kind of last of gas auxiliary jet formation comprises:

One body comprises one and has periphery outside the shoe-shaped profile, and this body comprises a footwear heel and divides and a sole portion; It is characterized in that:

This body is provided with one and is formed at its interior air chamber along its length direction.

2, the last of gas auxiliary jet formation according to claim 1 is characterized in that:

This air chamber is the periphery contour along this body, is located within this body, makes this body form to have the hollow structure of an even limit wall.

Images