CN1785660A - Manufacturing method of foamed intermediate base inl 1:1 ethylene vinyl acetate copolymer monld - Google Patents
Manufacturing method of foamed intermediate base inl 1:1 ethylene vinyl acetate copolymer monld Download PDFInfo
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- CN1785660A CN1785660A CN 200410100859 CN200410100859A CN1785660A CN 1785660 A CN1785660 A CN 1785660A CN 200410100859 CN200410100859 CN 200410100859 CN 200410100859 A CN200410100859 A CN 200410100859A CN 1785660 A CN1785660 A CN 1785660A
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- vinyl acetate
- ethylene vinyl
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Abstract
A foaming-in-mould method for preparing insole from ethene-vinyl acetate copolymer includes such steps as mixing raw materials, pugging while adding chemicophysical foaming agent, granulating, and ejecting moulding while foaming. The ratio of the insole size to moulding cavity size is 1:1.
Description
Technical field
The present invention relates to method for making of a kind of middle end, particularly relates to a kind of method for making of the middle end that increases by 1: 1 ethylene vinyl acetate co-polymer foam-in-mould of finished product yield and physical characteristic.
Background technology
See also shown in Figure 1, general in end method for making mainly be through the following step:
(1). raw material mixes: at first be ready to raw material, include ethylene vinyl acetate co-polymer (EVA) plastic raw materials, filler and bridging agent, and add coloring agent or the look grain that predetermined color is arranged, put into a kneader and mix and become sizing material.
(2). add chemical blowing agent: allocate a chemical blowing agent with suitable composition ratio, CBA is added continue in the sizing material to mix.
(3). extrusion granulation: then the above-mentioned sizing material for preparing is delivered in the extruder ethylene vinyl acetate co-polymer (EVA) the plastics material grain that utilizes extruder the sizing material granulation can be become to have color.
(4). ejection formation: above-mentioned ethylene vinyl acetate co-polymer (EVA) plastics material grain is delivered in the Jet forming machine, after configuring the ejaculation temperature and time, consult shown in Figure 2 simultaneously, this Jet forming machine can penetrate the fusion of material grain to a mould 100, makes mould 100 inside mold the semi-finished product 1 with external form of the middle end.
(5). mould foams outward: after the ejaculation operation finishes, but semi-finished product 1 are taken out in the demoulding, and these semi-finished product 1 can foam and expanding volume in mould 100 outsides.
(6). cooling and shaping: the semi-finished product 1 after will foaming are inserted in the baking oven 200 and are reduced temperature, and continue to carry out the stage cooling, make semi-finished product 1 volume can shrink typing gradually to predetermined size.
(7). finish end finished product 2 at last.
Though above-mentioned processing procedure can reach the function of foaming, but the employed blowing agent of general middle end foaming processing procedure is to belong to chemical blowing agent, when sizing material is finished ejection formation and is carried out the demoulding, volume can promptly expand outside mould, cause the finished size ratio to change, therefore the employed mould 100 of general foaming processing procedure, normally make the shape of die cavity with the predetermined reduction ratio according to the actual size of finished product, so behind foaming and intumescing, the means that recycling cooling is shunk are finalized the design to the size of original design, yet the variable quantity that this kind foaming is shunk, the most important control factor is the prescription composition that depends on chemical blowing agent, its ratio allotment must be controlled quite precisely strictly, need only some error slightly, just allow the size of the last foaming of sizing material differ easily, cause the ratio of product fraction defective higher, in addition, general foaming processing procedure is to dwindle mould 100 owing to what adopt, though can utilize the means of foaming to enlarge the volume of finished product, but thus, it is less that sizing material is incident upon the amount of mould, can cause the inner quality of product soft after the foaming, physical property is not good, and the service life of product is shorter.
Summary of the invention
The object of the invention is to provide a kind of method for making of the middle end that increases by 1: 1 ethylene vinyl acetate co-polymer foam-in-mould of finished product yield and physical characteristic.
The invention provides the method for making of the middle end of a kind of 1: 1 ethylene vinyl acetate co-polymer foam-in-mould, at first get an ethylene vinyl acetate co-polymer raw material, the filler and the bridging agent that add predetermined ratio mix, sizing material after mixing can be delivered to and carry out granulation in the extruder, relend by an ejaculator sizing material ejaculation a to in-mold molding is gone out finished product of the middle end, it is characterized in that: in the middle of the process of mixing, ethylene vinyl acetate co-polymer raw material adds a chemistry and physical foaming agent, in the middle of the ejection formation process, the mould that uses be inside have one with 1: 1 die cavity of finished product of the middle end with the equal proportion shape, this physical foaming agent can make sizing material carry out foaming in mould.
Effect of the present invention mainly is utilize to add chemistry and physical foaming agent, makes directly foaming in 1: 1 mould of sizing material, reaches the effect of lifting finished product yield and physical characteristic whereby.
The present invention is described in detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the flow chart at the general middle end;
Fig. 2 is the shaping schematic view of foaming in the general middle bed die;
Fig. 3 is the flow chart of method for making one preferred embodiment of the middle end of 1: 1 ethylene vinyl acetate co-polymer of the present invention foam-in-mould;
Fig. 4 is the shaping schematic view of above-mentioned preferred embodiment, illustrates that the present invention is 1: 1 mould is done the moulding action of foam-in-mould;
Fig. 5 is the stereogram of above-mentioned preferred embodiment, and the finished product of the middle end that the present invention produces is described.
The specific embodiment
Aforementioned and other technology contents, characteristics and effect about the present invention in the following detailed description that cooperates with reference to a graphic preferred embodiment, can clearly present.
Referring to shown in Figure 3, the method for making of the middle end of 1: 1 ethylene vinyl acetate co-polymer of the present invention foam-in-mould is in a preferred embodiment, consisting predominantly of (1). raw material mixes → (2). add chemistry and physical foaming agent → (3). extrusion granulation → (4). ejection formation → (5). foam-in-mould → (6). cooling → (7). steps such as finished product of the middle end, then, again the execution situation of above-mentioned steps and correlative detail are specified in after.
(1). raw material mixes; get an amount of ethylene vinyl acetate co-polymer (EVA) plastic raw materials; with kneader idle running 5 minutes; make machine lubricated; then above-mentioned raw materials is inserted that dnockout mixes in the kneader; when the temperature of mixing in the kneader reaches 90 ℃ when making the softening fully fusion of raw material; the look grain or the colorant that add filler and predetermined color are again mixed; in the present embodiment; what filler used is that calcium carbonate or talcum powder are wherein a kind of; the temperature of will mixing is set in below 110 ℃, mixes 6 ~ 7 minutes time, just can begin blanking.
(2). add chemistry and physical foaming agent, characteristics of the present invention are, in the middle of the process that ethylene vinyl acetate co-polymer (EVA) plastic raw materials mixes, the chemical blowing agent and one that adds a trace occupies the physical foaming agent of larger proportion composition, then add a bridging agent again, in the present embodiment, physical blowing agent is the blowing agent that adopts this type of ES-37D, and bridging agent then is to use the DCP peroxide.
(3). the extrusion granulation, the sizing material that above-mentioned processing procedure is prepared is delivered in the extruder, and extruder can be given as security sizing material and make ethylene vinyl acetate co-polymer (EVA) the plastics material grain that mixes.
(4). ejection formation, above-mentioned ethylene vinyl acetate co-polymer (EVA) plastics material grain is delivered in the Jet forming machine, consult shown in Figure 4 simultaneously, after Jet forming machine will be expected a complete fusion, just can begin to penetrate to the die cavity of a mould 300 and mold end semi-finished product 3 in, at 170 ~ 176 ℃, board pressure is at 145+5kg/cm to the ejaculation temperature of mould 300 in setting
2About 6 ~ 7 minutes of molding time, another characteristic of the present invention are to adopt the mould of 1: 1 ratio, that is to say, the die cavity shape of this mould 300 is identical with finished product of the middle end 4 (the seeing Fig. 5) size of last moulding, and so the product after the moulding directly is exactly a finished size.
(5). foam-in-mould, this mould 300 is in the middle of the ejection formation process, because ethylene vinyl acetate co-polymer (EVA) plastics material grain is added with physical foaming agent, this physical foaming agent can make sizing material directly foam in die cavity, so can mold middle Bottom Shape according to die cavity fully.
(6). cooling, open behind the mould 300 semi-finished product 3 of the middle end are taken out from die cavity, insert again in the baking oven 400 and cooled, the temperature of end semi-finished product 3 can be reduced under the room temperature in making, and the time spends 13 ~ 15 minutes approximately.
(7). finished product of the middle end behind above-mentioned processing procedure, can obtain finished product of the middle end 4 as shown in Figure 5.
More than be the general introduction of the every step of middle end method for making of 1: 1 ethylene vinyl acetate co-polymer of the present invention foam-in-mould, then, again the present invention is expected that attainable effect is specified in after.
(1). product yield height: the present invention adopts the technology of adding chemistry and physical foaming agent and cooperating 1: 1 mould 300, it is to allow sizing material directly foaming in mould that this physical foaming agent mainly acts on, end finished product in so can mold at 1: 1 according to the die cavity shape fully, the present invention is after finishing the ejection formation step, resulting product is exactly a finished size, do not have the problem that volume contraction changes, can reach the requirement of the high yield of product, reduce manufacturing cost whereby effectively.
(2). improve the product physical characteristic: what the present invention adopted is 1: 1 mould 300, the die cavity of this mould 300 is identical with actual finished size, the employed mould 100 that dwindles in the end in the general foaming, 1: 1 sizing material amount in the mould 300 is inserted in the present invention's ejaculation can be increased many, the finished product of the middle end 4 that allows the present invention mold at last has more abundant quality tissue, in all obviously general foaming of physical characteristics such as crushing resistance and flexing resistance the end better, especially this series products is to be worn on the human foot at the middle end, long-term grantee's body weight and impulse force such as run step, the end situation generation of breaking during the physical characteristic that promotes quality tissue can reduce effectively helps to prolong service life of product.
Claims (4)
1. the method for making of the middle end of 1: 1 ethylene vinyl acetate co-polymer foam-in-mould, at first get an ethylene vinyl acetate co-polymer raw material, the filler and the bridge formation auxiliary agent that add predetermined ratio mix, sizing material after mixing can be delivered to and carry out granulation in the extruder, relend by an ejaculator with sizing material penetrate go out to an in-mold molding in end finished product, it is characterized in that:
In the middle of the process of mixing, ethylene vinyl acetate co-polymer raw material adds a chemistry and physical foaming agent, in the middle of the ejection formation process, the mould of use have one with 1: 1 die cavity of finished product of the middle end with the equal proportion shape, this physical foaming agent can make sizing material carry out foaming in mould.
2. the method for making of the middle end of 1: 1 as claimed in claim 1 ethylene vinyl acetate co-polymer foam-in-mould is characterized in that: the filler that uses in the middle of the process of mixing is to select an enforcement by calcium carbonate and two kinds of materials of talcum powder, and bridging agent is a peroxide.
3. the method for making of the middle end of 1: 1 as claimed in claim 1 ethylene vinyl acetate co-polymer foam-in-mould is characterized in that: in the process of mixing, set and mix temperature below 110 ℃, the time of mixing was at 6 ~ 7 minutes.
4. the method for making of the middle end of 1: 1 as claimed in claim 1 ethylene vinyl acetate co-polymer foam-in-mould is characterized in that: in the ejection formation process, set and penetrate temperature at 170 ~ 176 ℃, board pressure is at 145 ± 5kg/cm
2, molding time was at 6 ~ 7 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410100859 CN1785660A (en) | 2004-12-09 | 2004-12-09 | Manufacturing method of foamed intermediate base inl 1:1 ethylene vinyl acetate copolymer monld |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410100859 CN1785660A (en) | 2004-12-09 | 2004-12-09 | Manufacturing method of foamed intermediate base inl 1:1 ethylene vinyl acetate copolymer monld |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1785660A true CN1785660A (en) | 2006-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410100859 Pending CN1785660A (en) | 2004-12-09 | 2004-12-09 | Manufacturing method of foamed intermediate base inl 1:1 ethylene vinyl acetate copolymer monld |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1785660A (en) |
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2004
- 2004-12-09 CN CN 200410100859 patent/CN1785660A/en active Pending
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20060614 |