CN216579126U - Novel EPE sheet forming die - Google Patents

Abstract

The utility model relates to the technical field of dies, in particular to a novel die for forming an EPE sheet, which comprises a concave die and a convex die, wherein the discharge end of the concave die is matched with a convex extrusion end, so that a molten material is extruded out through a closed gap of the concave die and the convex extrusion end; the extrusion end is provided with a plurality of concave-convex structures which are arranged circumferentially along the radial direction, and the depth of the concave-convex structures is deepened outwards along the radial direction, so that the cross section of the extruded EPE sheet is in a spindle shape. According to the utility model, the concave-convex structure is arranged at the extrusion end of the convex mould, so that a novel EPE sheet with a spindle-shaped cross section is formed after a molten material is deformed by the concave-convex structure; this fusiform EPE sheet complex forms EPE panel, and there is the space inside the panel for the inside residual butane of sheet can release relatively fast, can also satisfy the basic demand of current commodity circulation packing, has further improved the mechanical properties of material, is favorable to save material, reduce cost.

Description

Novel EPE sheet forming die

Technical Field

The utility model relates to the technical field of dies, in particular to a novel die for forming an EPE sheet.

Background

EPE (expanded polyethylene) is a novel environment-friendly packaging material, also called pearl cotton, has the characteristics of light weight and good buffering performance, and can realize higher mechanical property with low density, so that the EPE is widely applied all over the world, particularly in logistics packaging. In the prior art, generally, a round-mouth straight die is adopted to produce low-density low-thickness flatness coiled materials in a large scale, after a period of curing and shaping, some coiled materials are directly cut into gaskets or cover plates for packaging, some coiled materials are cut into sheets and then are compositely thickened to prepare plates with different thicknesses, and then the cushion packaging is customized by cutting, die cutting, bonding and other modes on the plates, so that the cushion packaging box is widely applied to the internal protection of logistics packaging of numerous door products such as electronic appliances, automobile parts, fresh agricultural products and the like.

For example, the patent number CN104690875A entitled "a mold for producing flat pearl cotton" discloses that the published date is 2015, 06 and 10, discloses a mold for producing flat pearl cotton, wherein two ends of a male mold are respectively a mounting end and a working end, the middle part of the working end protrudes outwards to form a protruding part, and an inclined surface is arranged between the protruding part and the outer periphery of the working end; the two ends of the female die are respectively a feeding end and a discharging end, the feeding end is provided with a feeding hole, the discharging end is provided with a discharging hole, the discharging hole is communicated with the feeding hole, the outer side of the discharging end is provided with an outer chamfer, and the inner side of the discharging hole is provided with an inner chamfer; when the working end of the male die is matched with the discharge end of the female die, the protruding part of the male die extends into the discharge port of the female die, a first included angle alpha is formed between the inner chamfer of the female die and the inclined surface of the male die, and a second included angle beta is formed between the outer chamfer of the female die and the inclined surface of the male die.

Above-mentioned patent can improve the roughness of material, but the coil stock that adopts above-mentioned mould to make when placing the health preserving design in the warehouse, because of the level and smooth structure of thin slice leads to not having the clearance each other, the butane that adds in the preparation process can not obtain release comparatively fast, consequently need have longer health preserving period, and this has also led to production cycle to lengthen, and production efficiency reduces.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of unsmooth butane release space in the existing EPE coiled material curing process mentioned in the prior art, the utility model provides a novel EPE sheet forming die which comprises a concave die and a convex die, wherein the discharge end of the concave die is in an inner inverted angle shape, the extrusion end of the convex die is in an outer inverted angle shape, and the discharge end is matched with the extrusion end, so that a molten material is extruded out through a closed gap of the concave die and the convex die; the extrusion end is provided with a plurality of concave-convex structures which are circumferentially arranged along the radial direction, and the depth of the concave-convex structures is deepened outwards along the radial direction, so that the cross section of the extruded EPE sheet is in a spindle shape.

Further, the fixed disc is further included and used for fixing the concave mould on the frame.

Further, the inner cavity of the concave mould is funnel-shaped.

Further, the die comprises a mandrel, wherein the mandrel is sequentially sleeved on the concave die and the convex die.

Further, the adjusting device further comprises an adjusting nut, and the adjusting nut is used for adjusting the distance between the female die and the male die.

Compared with the prior art, the novel EPE sheet forming die provided by the utility model has the following advantages: the extrusion end of the convex mould is provided with a plurality of concave-convex structures which are arranged circumferentially, so that the molten material is deformed through the concave-convex structures to form a novel EPE sheet with a spindle-shaped cross section; after the spindle-shaped EPE sheet is compounded to form the EPE sheet, a plurality of gaps exist in the sheet, so that on one hand, a space is provided for releasing the foaming polymer butane, and the production period is accelerated; on the other hand, the basic requirements of the existing logistics packaging can be met, the mechanical properties such as material compression, elastic recovery rate and the like are further provided, the material is saved, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a front view of the novel EPE sheet forming mold provided by the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic view of the male mold;

FIG. 4 is a partial enlarged view of B in FIG. 3;

FIG. 5 is a schematic cross-sectional view of the resulting novel EPE sheet;

FIG. 6 is a schematic view of a mold structure according to another embodiment of the present invention;

FIG. 7 is an exploded view of a mold structure according to another embodiment of the present invention;

FIG. 8 is a schematic structural view of a foaming machine using the mold provided by the present invention;

FIG. 9 is a schematic cross-sectional view of a composite new EPE hollow board;

fig. 10 is a schematic cross-sectional view of another embodiment of the composite new EPE hollow board material.

Reference numerals:

110 female mold 120 male mold 111 discharge end

121 extrusion end 122 concave-convex structure 130 fixed disk

140 mandrel 150 adjusting nut 210 foaming main machine

220 stereotype cutting assembly 230 radiator unit 240 and pull rolling subassembly

221 shaping drum 222 cutting mechanism

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a novel mould for forming an EPE sheet, which comprises a concave mould 110 and a convex mould 120, wherein the discharge end 111 of the concave mould 110 is in an inner inverted angle shape, the extrusion end 121 of the convex mould 120 is in an outer inverted angle shape, and the discharge end 111 is matched with the extrusion end 121, so that a molten material is extruded from a closed gap between the discharge end 111 and the extrusion end 121; the extrusion end 121 is provided with a plurality of circumferentially arranged concave-convex structures 122 along the radial direction, and the depth of the concave-convex structures 122 is deepened outwards along the radial direction, so that the cross section of the extruded EPE sheet is in a spindle shape.

In specific implementation, as shown in fig. 1 to 5, the mold for forming the novel EPE sheet includes a concave mold 110 with a discharge end 111 in an inner inverted angle shape and a convex mold 120 with an extrusion end 121 in an outer inverted angle shape; preferably, as shown in fig. 3, the included angle α between the outer chamfer inclined surface of the male mold 120 and the radial direction of the male mold 120 is in the range of 15 ° to 25 °, and it is found that the mold with the included angle range therebetween has a more stable die pressure when the EPE sheet is formed. As shown in fig. 3 to 4, the male mold 120 is provided with a plurality of circumferentially arranged concave-convex structures 122 along the radial direction, and the depth of the concave-convex structures 122 is increased radially outwards. It should be understood that the shape of the concave-convex structure 122 is not limited to the rectangular concave-convex structure shown in fig. 4, and those skilled in the art can substitute other structures capable of making the cross section of the extruded EPE sheet have a spindle shape, such as an arc concave-convex structure, a triangular concave-convex structure, a trapezoid concave-convex structure, etc., instead of the shape of the concave-convex structure 122 according to the present invention. Preferably, each adjacent concave-convex structure 122 forms an arrangement angle between 3 ° and 45 °. When the EPE sheets formed by the dies with the adjacent concave-convex structures 122 arranged at angles smaller than 3 degrees are compounded into the EPE plate, the butane release effect is not obvious, and when the EPE sheets formed by the dies with the adjacent concave-convex structures 122 arranged at angles larger than 45 degrees are compounded into the EPE plate, the strength and the performance are relatively insufficient; therefore, for the conventional moulds in the market, the EPE sheet formed by arranging the angles in the range is easier to form regular corrugations in the shape of spindles, the corrugation performance is better, and the butane release effect is better.

The working principle is that the molten material is extruded from a closing gap of the die under the combined action of the driving force and the traction force, the molten material is deformed through the concave-convex structure 122, and is foamed and expanded due to the change of pressure difference, and finally, the novel EPE sheet with the spindle-shaped cross section is formed. The upper and lower surface convex parts of the novel fusiform EPE sheet are in symmetrical circular arcs, so that the sheet can absorb higher energy in the compression deformation process, and compared with a common flat EPE sheet or an EPE sheet with irregular upper and lower surfaces, the novel fusiform EPE sheet has higher elastic recovery rate, and the bonding strength cannot be reduced.

According to the novel EPE sheet forming die, the extrusion end of the convex die is provided with the plurality of concave-convex structures which are circumferentially arranged, so that a molten material is deformed through the concave-convex structures to form the novel EPE sheet with the spindle-shaped cross section; the spindle-shaped EPE sheet has more gaps in the interior after the EPE sheet is compounded to form the EPE sheet, so that on one hand, a space is provided for releasing butane remained in a foaming polymer, and the production period is accelerated; on the other hand, the basic requirements of the existing logistics packaging can be met, the mechanical properties such as compression, elastic recovery rate and the like of the material are further improved, the use of the material is reduced, and the cost is reduced.

Preferably, a fixing disc 130 is further included, and the fixing disc 130 is used for fixing the female mold 110 on a frame.

In specific implementation, as shown in fig. 6 to 7, the fixing disc 130 is provided with a plurality of through holes, so that the concave mold 110 can be fixed on the rack through threaded connection, and can also be fixed in detachable manners such as other clamping and pin connection.

Preferably, the inner cavity of the female mold 110 is funnel-shaped.

In specific implementation, as shown in fig. 2, the inner cavity of the concave mold 110 is funnel-shaped, that is, the inner cavity of the concave mold 110 narrows along the direction of the discharge end 111, which not only facilitates material transportation, but also achieves the purpose of pressurization at the discharge port, and facilitates material extrusion molding.

Preferably, the die further comprises a mandrel 140, and the mandrel 140 is sequentially sleeved on the female die 110 and the male die 120.

Preferably, an adjusting nut 150 is further included, and the adjusting nut 150 is used for adjusting the distance between the female mold 110 and the male mold 120.

During specific implementation, as shown in fig. 6 to 7, according to the working requirement, the adjusting nut 150 is used for adjusting the distance between the concave mold 110 and the convex mold 120 so as to adjust the closing gap when the concave mold 110 and the convex mold 120 are matched, thereby obtaining EPE sheets with different thicknesses, without changing the molds, increasing the practicability and improving the production efficiency. Preferably, the end of the mandrel 140 is provided with a screw thread, and the adjusting nut 150 is screwed with the mandrel 140 to adjust the distance.

The novel EPE sheet material with the spindle-shaped cross section can be processed by applying the mould for forming the novel EPE sheet material in a foaming machine, so that the novel EPE sheet material is low in material consumption, complete butane release is ensured in the curing process, and after the EPE sheet material is formed in a composite mode, a regular and stable structure body is provided, and the buffering and shock insulation performance of the material is good.

In specific implementation, as shown in fig. 8, the foaming main machine 210 is provided with an anti-shrinking agent injection port, a foaming agent injection port and a cooling system, after the prepared raw material is melted at a high temperature in the foaming main machine 210, the anti-shrinking agent and the foaming agent are injected into the foaming main machine 210 through the injection port and mixed with the raw material, the raw material is cooled by the cooling system at a low temperature section of the main machine, a discharge port of the low temperature section is connected with the mold, the raw material is extruded by the mold to form a novel EPE sheet with a spindle-shaped cross section, the novel EPE sheet is subjected to width shaping and cutting by the shaping and cutting assembly 220, and finally the heat dissipation and winding are performed by the heat dissipation assembly 230 and the traction and winding assembly 240, so as to obtain the novel EPE coil. Wherein, design cutting assembly 220 is including the design drum 221 that is used for deciding EPE sheet width and the cutting mechanism 222 that cuts cyclic annular EPE sheet open, design drum 221 is provided with the forced air cooling and the water-cooling device is through forced air cooling and water-cooling design, cutting mechanism 222 sets up at design drum 221 afterbody, including air knife, drive arrangement and connecting piece, can be with the cyclic annular EPE sheet subdivision after the design.

As an example, the mold of the present invention is applied to the preparation method of EPE hollow plate material, and can be prepared by the following steps: firstly, mixing preparation raw materials according to a certain proportion, conveying the mixture to a foaming main machine through a feeder for high-temperature melting, then adding an anti-shrinkage agent and a foaming agent to mix with the raw materials, cooling the mixture by a cooling system, and extruding the mixture by using the EPE sheet forming die to form a novel EPE sheet with a spindle-shaped cross section and rolling the novel EPE sheet; secondly, carrying out curing and sizing on the rolled novel EPE sheet; and finally, compounding the novel EPE sheet after the curing and shaping by adopting EPE sheet compounding equipment, and compounding the novel EPE sheet to the required thickness to obtain the novel EPE hollow sheet.

In specific implementation, the preparation method of the EPE hollow plate is completed through the steps. Preferably, the temperature of the molten mixture at the extrusion opening of the die is set to be between 90 ℃ and 120 ℃, and the molten mixture in the temperature range has better fluidity, so that the extruded EPE sheet has better molding effect. As another embodiment, when the alpha included angle of the convex mould is 15-25 degrees and the temperature of the molten mixture in the mould extrusion opening is set to be 90-120 ℃, the fluidity of the molten mixture in the mould extrusion opening is optimal, and the molding effect of the extruded EPE sheet is best, so that the mechanical property of the finally compounded EPE hollow sheet is optimal. As shown in FIG. 9, the cross-sectional view of the novel EPE hollow plate is schematically shown, and the novel EPE sheets are compounded to form the plate, so that the internal buffer space between the plates is large, and the material is greatly saved. In the preparation process, the residual butane can be ensured to have enough release space, the production efficiency is improved, and gaps with regular arrangement are formed, so that the compounding difficulty and the bonding strength of the residual butane and the bonding strength cannot be increased. As a preferred option, multiple layers of the novel EPE sheet can be cross-plied with multiple layers of the conventional flat EPE sheet and compounded, as shown in the various composite forms exemplified in fig. 10. It should be noted that, on one hand, the cross-compounding manner is not limited to that shown in fig. 10, and can be freely and arbitrarily matched according to the actual working conditions; on the other hand, the composite form illustrated in fig. 10 only shows the crossing manner, but not the final structure of the composite plate, i.e. the composite plate can be repeatedly crossed and stacked to reach the ideal height according to the requirements of different plate heights in actual work. Compared with the common EPE and the product thereof, the EPE plate and the product thereof with the same thickness and density improved by the utility model have the advantages of short production period, light weight, less material consumption and better buffer performance such as compression resistance, impact resistance, shock resistance and the like.

Wherein, will the rolling is carried out to novel EPE sheet includes the following step: firstly, fixing the width of an extruded annular novel EPE sheet by a fixing drum, and then cutting the sheet by a cutting mechanism; secondly, the novel cut EPE sheet is drawn to a heat dissipation assembly to be unfolded and dissipated, and then is rolled.

Although terms such as female die, male die, discharge end, extrusion end, relief structure, fixed disk, mandrel, adjusting nut, foaming machine, sizing and cutting assembly, heat sink assembly, traction wrap assembly, sizing drum, cutting mechanism, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A novel mould for forming EPE sheets comprises a concave mould (110) and a convex mould (120), and is characterized in that: the discharge end (111) of the concave mould (110) is in an inner inverted angle shape, the extrusion end (121) of the convex mould (120) is in an outer inverted angle shape, and the discharge end (111) is matched with the extrusion end (121) so that the molten material is extruded from a closed gap between the discharge end and the extrusion end; the extrusion end (121) is provided with a plurality of concave-convex structures (122) which are circumferentially arranged in the radial direction, and the depth of the concave-convex structures (122) is deepened outwards in the radial direction, so that the cross section of the extruded EPE sheet is in a spindle shape.

2. The novel mould for forming EPE sheets according to claim 1, characterized in that: the die further comprises a fixed disc (130), wherein the fixed disc (130) is used for fixing the concave die (110) on a frame.

3. The novel mould for forming EPE sheets according to claim 1, characterized in that: the inner cavity of the concave mould (110) is funnel-shaped.

4. The new form of EPE sheet according to any one of claims 1 to 3, wherein: the die further comprises a mandrel (140), and the mandrel (140) is sequentially sleeved on the concave die (110) and the convex die (120).

5. The novel mould for forming EPE sheets according to claim 4, characterized in that: the mould also comprises an adjusting nut (150), and the adjusting nut (150) is used for adjusting the distance between the female mould (110) and the male mould (120).

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