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CN-224224359-U - Multicolor composite supercritical thermoplastic polyurethane foaming forming die structure

CN224224359UCN 224224359 UCN224224359 UCN 224224359UCN-224224359-U

Abstract

The utility model relates to a multicolor composite supercritical thermoplastic polyurethane foaming molding die structure, which comprises a lower die, an upper die and a middle die, wherein the lower die is provided with a lower die cavity, the upper die is arranged above the lower die and is provided with a die convex part facing the lower die cavity, the middle die is arranged between the upper die and the lower die and is provided with a hollow ring part corresponding to the lower die cavity and the die convex part, the inner ring surface of the hollow ring part is provided with a positioning structure for positioning a heterochromatic surface part, and the foaming finished product with multiple colors can be obtained in a single foaming molding process through the die structure design of the utility model, and the matching of multiple colors is realized by carrying out surface modification or secondary processing after the foaming molding, so that the production efficiency is effectively improved and the cost is saved.

Inventors

  • XU SHAOWEI

Assignees

  • 宗昌工业有限公司

Dates

Publication Date
20260512
Application Date
20250424

Claims (8)

  1. 1. The utility model provides a polychrome compound supercritical thermoplastic polyurethane foam forming die structure which characterized in that includes: a lower die having a lower die cavity; An upper mold disposed above the lower mold and having a mold protrusion facing the lower mold cavity, and The middle die is arranged between the upper die and the lower die and is provided with a hollow ring part corresponding to the lower die cavity and the die convex part, the inner ring surface of the hollow ring part is provided with a positioning structure, the positioning structure is used for positioning a different-color surface piece, and when the lower die, the upper die and the middle die are matched, the lower die cavity, the die convex part and the hollow ring part jointly form a closed die cavity.
  2. 2. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 1, wherein the positioning structure is a plane or a groove.
  3. 3. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 1, wherein the middle die comprises a middle die body and a split middle die body, the middle die body has a first combining portion, the split middle die has a second combining portion combined with or separated from the first combining portion, and the hollow ring portion.
  4. 4. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 3, wherein the first combining portion of the middle die body has a plurality of positioning protrusions, and the second combining portion of the split middle die has a plurality of positioning recesses corresponding to the positioning protrusions.
  5. 5. The utility model provides a polychrome compound supercritical thermoplastic polyurethane foam forming die structure which characterized in that includes: A lower mold having a lower mold cavity and a positioning structure disposed in the lower mold cavity for positioning a different-color surface member, and The upper die is arranged above the lower die and is provided with a die convex part facing the lower die cavity, and when the lower die and the upper die are clamped, the lower die cavity and the die convex part jointly form a closed die cavity.
  6. 6. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 5, wherein the positioning structure is a plane or a groove.
  7. 7. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 5, wherein the lower die comprises a lower die body and a split lower die, the lower die body has a first bonding portion, and the split lower die has a second bonding portion bonded to or separated from the first bonding portion and the positioning structure.
  8. 8. The multi-color composite supercritical thermoplastic polyurethane foam molding die structure according to claim 7, wherein the first combining portion of the lower die body has a plurality of positioning protrusions, and the second combining portion of the separate lower die has a plurality of positioning recesses corresponding to the positioning protrusions.

Description

Multicolor composite supercritical thermoplastic polyurethane foaming forming die structure Technical Field The utility model relates to a foaming forming die of supercritical Thermoplastic Polyurethane (TPU), in particular to a foaming forming die structure of polychromatic compound supercritical Thermoplastic Polyurethane (TPU). Background Supercritical TPU (thermoplastic polyurethane) foaming mould is an advanced technology specially used for manufacturing lightweight and high-elasticity products. The technology mainly uses supercritical fluid (such as carbon dioxide or nitrogen) as a foaming agent, dissolves the supercritical fluid into TPU material through high pressure, and then releases the pressure in a die to form a micro uniform bubble structure in the material, thereby achieving the purposes of reducing weight, enhancing buffering effect and reducing influence on environment. The plastic product integrally formed by the supercritical TPU foaming mold can be the components of sports shoes and leisure shoes, sports equipment such as cushion pads, protective equipment and yoga mats, medical and auxiliary equipment such as correction insoles, artificial limb mats and the like, and automobiles or bicycles such as seat cushions, sealing parts and the like. However, despite the advantages of supercritical TPU foaming techniques, only monochromatic articles can be formed. The supercritical fluid is mainly dissolved in the TPU in a high-pressure mode, and if particles or pigments with various colors are added, maldistribution can be caused, so that the consistency of the foaming effect and the final product is affected. In addition, in the supercritical state, the solubility and diffusion characteristics of the pigment are different from those of the conventional melt kneading. If an attempt is made to mix a plurality of colors, color delamination or uneven defects may occur after foaming due to differences in density or affinity. Therefore, if the plastic product integrally formed by the supercritical TPU foaming mold is required to have various colors, the plastic product can only be processed later, and further the defects of labor and time consumption are highlighted. For example, when the tread of the midsole is required to be colored in different colors, the injected midsole needs to be transported to another place for dyeing, coating or color patch adhesion, which leads to an increase in production cost. Disclosure of utility model The utility model aims to provide a multicolor composite supercritical Thermoplastic Polyurethane (TPU) foaming forming die structure capable of solving one problem. In order to achieve the above-mentioned object, the utility model provides a multi-color composite supercritical Thermoplastic Polyurethane (TPU) foaming molding die structure, which comprises a lower die, an upper die, a middle die and a hollow ring part, wherein the lower die is provided with a lower die cavity, the upper die is arranged above the lower die and is provided with a die convex part facing the lower die cavity, the middle die is arranged between the upper die and the lower die and is provided with a hollow ring part corresponding to the lower die cavity and the die convex part, the inner ring surface of the hollow ring part is provided with a positioning structure for positioning a heterochromatic surface piece, and when the lower die, the upper die and the middle die are clamped, the lower die cavity, the die convex part and the hollow ring part jointly form a closed die cavity. The utility model has the effects that the hollow ring part of the middle mold is provided with a positioning structure design, when the mold is used for foaming molding operation, the heterochromatic surface piece can be positioned in the hollow ring part of the middle mold in advance, then the mold closing and supercritical foaming operation are carried out, so that the foamed finished product is provided with the heterochromatic surface piece to present a multicolor composite foamed finished product, therefore, the foamed finished product with various colors can be obtained in a single foaming molding process through the mold structure design of the utility model, and after the foaming molding is not needed, the surface modification or secondary processing is carried out to realize the collocation of various colors, such as dyeing, coating or attaching other materials, thereby effectively improving the production efficiency and saving the cost. The multicolor composite foaming finished product can be a middle sole of sports shoes and leisure shoes, but is not limited to the middle sole, and can also be a cushion pad, a protective tool, a saddle of a bicycle and the like of sports equipment. Preferably, the positioning structure is a plane or a groove. Preferably, the middle die comprises a middle die body and a split middle die body, wherein the middle die body is provided with a first combining part, and the split