CN209814102U

CN209814102U - PU foaming mold structure

Info

Publication number: CN209814102U
Application number: CN201920365456.6U
Authority: CN
Inventors: 刘建平
Original assignee: Xinziyuan (shanghai) Science And Technology Development Co Ltd
Current assignee: Xinziyuan (shanghai) Science And Technology Development Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2019-12-20
Anticipated expiration: 2029-03-21

Abstract

The utility model relates to a PU foaming mould structure, including the thermoplastic material layer that is located the bottom to and cover the first PU foaming layer on the thermoplastic material layer, in the die-cut edge of PU foaming mould structure department, annular groove is processed on first PU foaming layer, and makes the first PU foaming layer part that is located the annular groove top cover the thermoplastic material layer part that is located the annular groove below completely. Compared with the prior art, the utility model discloses a change to mould tool-point department has promoted assembly performance and sound insulation effect, and then can be suitable for the foaming mould of the interior sound insulation pad of dash panel of most motorcycle types.

Description

PU foaming mold structure

Technical Field

The utility model relates to a foaming mold structure especially relates to a PU foaming mold structure.

Background

At present, for the sound insulation pad in the front wall panel, most of the sound insulation pad adopts multilayer composite materials to ensure the sound insulation and absorption performance, PU has better sound absorption performance, EVA or EPAM and other thermoplastic materials have better sound insulation effect, the method of combining the two materials together is usually realized by adopting a foaming mold, meanwhile, a plurality of assembly holes are arranged on the part, the peripheries of the holes need to be subjected to edge pressing treatment, the edge pressing treatment needed to be carried out on the peripheries of the holes on the part in the existing main manufacturing method is directly carried out on the mold for punching, the existing part molding state is shown as an accessory picture 1, the thermoplastic material layer 1 and the first PU foaming layer 2 are simply combined to form the sound insulation pad, and the peripheries of the holes are directly compounded by EPAM or EVA and other thermoplastic materials, so that the sealing performance and the sound insulation performance of the holes are reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a PU foaming mould structure for overcoming the defects of the prior art.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a PU foaming mould structure, is including the thermoplastic material layer that is located the bottom to and cover the first PU foaming layer on the thermoplastic material layer, at the die-cut edge of PU foaming mould structure department, annular groove is processed on first PU foaming layer, and makes the thermoplastic material layer part that is located the annular groove below covered completely in the first PU foaming layer part that is located the annular groove top. Form annular groove on the first PU foaming layer through making die-cut edge of a knife mouthful department, and the PU foaming layer part of annular groove top covers the thermoplastic material layer of bottom completely, like this, not only can form easily assembly and sealed notch type structure, simultaneously, can guarantee also to have the first PU foaming layer of sound absorption performance to cover at the assembly position, has improved the assembly leakproofness and the acoustic performance of whole PU foaming mould structure part greatly.

Preferably, the thermoplastic material layer is an EVA layer or an EPDM layer. The EVA layer or the EPDM layer has excellent sound insulation properties.

Preferably, the first PU foaming layer is sequentially covered with a gas barrier layer and a second PU foaming layer, the shapes of which are the same as those of the first PU foaming layer, and the second PU foaming layer is internally distributed with glass fibers. The setting of gas barrier can prevent effectively that volatile materials such as outside coats of lacquer skin from entering into the automobile body inside through structural layers such as thermoplastic material layer and first PU foaming layer, in addition, the setting on second PU foaming layer can further improve the sound absorption performance of whole foaming die structure, and glass fiber's distribution then is the intensity in order to improve second PU foaming layer as the skeleton support on the one hand, on the other hand then is for making second PU foaming layer and first PU foaming layer form density gradient, further improves sound absorption performance.

More preferably, the gas barrier layer is a hot melt plastic film layer. The gas barrier layer adopts a hot-melt plastic film layer, so that the adhesion of chemical adhesives can be omitted, and the function of isolating the permeation of volatile substances is further improved.

More preferably, the foaming ratio of the second PU foam layer is smaller than the foaming ratio of the first foam layer. Therefore, the two PU foaming layers can present obvious density gradient, and the sound field environment of the inner space of the automobile is improved.

More preferably, the distribution density of the glass fibers in the second PU foam layer is gradually increased along the direction close to the gas barrier layer and away from the gas barrier layer. Not only can set up reasonable intensity region as required, simultaneously, can further show density variation for second PU foaming layer, further improve sound absorption performance.

Compared with the prior art, the utility model has the advantages of it is following:

(1) through the improvement to the structure of the die-cut edge of foaming mold structure can improve its assembling property and sound absorption effect, can be applied to and give sound insulation in the dash panel of most motorcycle types and fill up the foaming mold.

(2) The air-proof layer, the second PU foaming layer, the glass fiber and the like which are further arranged on the foaming mould structure not only improve the sound absorption performance of the foaming mould structure, but also obviously improve the strength, the air-proof performance and the like.

Drawings

FIG. 1 is a schematic view of a conventional PU foam mold structure;

fig. 2 is a schematic view of the structure of a PU foam mold of example 1 of the present invention;

fig. 3 is a schematic view of the structure of a PU foaming mold of example 2 of the present invention;

in the figure, 1 is a thermoplastic material layer, 2 is a first PU foaming layer, 3 is an annular groove, 4 is a gas barrier layer, 5 is a second PU foaming layer, and 6 is glass fiber.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

A PU foaming mould structure is shown in figure 2 and comprises a thermoplastic material layer 1 positioned at the bottom and a first PU foaming layer 2 covered on the thermoplastic material layer 1, wherein an annular groove 3 is processed on the first PU foaming layer 2 at the position of a punching cutting edge of the PU foaming mould structure, and the part of the thermoplastic material layer 1 positioned below the annular groove 3 is completely covered by the part of the first PU foaming layer 2 positioned above the annular groove 3. Form annular groove 3 on the first PU foaming layer 2 through making die-cut edge of a knife mouthful department, and the PU foaming layer part of annular groove 3 top covers the thermoplastic material layer 1 of bottom completely, like this, not only can form easily assembly and sealed notch type structure, simultaneously, can guarantee also to have the first PU foaming layer 2 of sound absorption to cover at the assembly position, improved the assembly leakproofness and the acoustic performance of whole PU foaming mould structure part greatly.

The thermoplastic material layer 1 in this embodiment is an EVA layer or an EPDM layer, etc. The EVA layer or the EPDM layer has excellent sound insulation properties.

Example 2

On the basis of the embodiment 1, the embodiment further sequentially covers the first PU foam layer 2 with the air-barrier layer 4 and the second PU foam layer 5, which have the same shape as the first PU foam layer, and the second PU foam layer 5 is distributed with glass fibers 6, as shown in fig. 3. The setting of gas barrier layer 4 can prevent effectively that volatile materials such as outside lacquer leather from entering into the automobile body inside through structural layers such as thermoplastic material layer 1 and first PU foaming layer 2, in addition, the sound absorption performance of whole foaming die structure can further be improved in the setting of second PU foaming layer 5, and glass fiber 6's distribution then is as the skeleton brace on the one hand in order to improve the intensity of second PU foaming layer 5, on the other hand then is in order to make second PU foaming layer 5 and first PU foaming layer 2 form density gradient, further improve sound absorption performance.

Example 3

In addition to the embodiment 2, in this embodiment, in order to omit the chemical adhesive bonding and further improve the function of isolating the permeation of the volatile substance, the gas barrier layer 4 of this embodiment adopts a hot-melt plastic film layer.

Example 4

On the basis of embodiment 2, in order to make the two PU foam layers present an obvious density gradient and improve the sound field environment of the interior space of the automobile, the foaming ratio of the second PU foam layer 5 is further controlled to be smaller than that of the first foam layer.

Example 5

On the basis of embodiment 2, in order to set up reasonable strength area as required, simultaneously, can make second PU foam layer 5 further show density change, further improve sound absorption performance, the distribution density of glass fiber 6 in second PU foam layer 5 of this embodiment is according to being close to gas barrier 4 side direction and keeping away from gas barrier 4 side direction and gradually increasing.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. The utility model provides a PU foaming die structure, is including the thermoplastic material layer that is located the bottom to and cover the first PU foaming layer on the thermoplastic material layer, its characterized in that, in the die-cut edge of PU foaming die structure department, annular groove is processed on first PU foaming layer to make the first PU foaming layer part that is located the annular groove top cover the thermoplastic material layer part that is located the annular groove below completely.

2. The foam PU molding structure of claim 1, wherein the thermoplastic material layer is an EVA layer or an EPDM layer.

3. The PU foaming mold structure of claim 1, wherein the first PU foaming layer is further covered with a gas barrier layer and a second PU foaming layer in sequence, the shapes of which are the same as those of the first PU foaming layer, and glass fibers are further distributed in the second PU foaming layer.

4. The PU foam molding structure of claim 3, wherein the gas barrier layer is a hot-melt plastic film layer.

5. The PU foam molding structure of claim 3, wherein the expansion ratio of the second PU foam layer is smaller than the expansion ratio of the first foam layer.

6. The PU foam mold structure according to claim 3, wherein the distribution density of the glass fibers in the second PU foam layer is gradually increased in a direction from the side close to the gas barrier layer to the side far from the gas barrier layer.