CN111037774A - Mixing control method for preplasticizing plastic powder - Google Patents
Mixing control method for preplasticizing plastic powder Download PDFInfo
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- CN111037774A CN111037774A CN201911243114.8A CN201911243114A CN111037774A CN 111037774 A CN111037774 A CN 111037774A CN 201911243114 A CN201911243114 A CN 201911243114A CN 111037774 A CN111037774 A CN 111037774A
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- preplasticizing
- temperature rise
- plastic powder
- rise slope
- mixed plastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/823—Temperature control
Abstract
The invention provides a mixing control method for preplasticizing plastic powder. A mixing control method for preplasticizing plastic powder comprises the following steps: s1, heating mixed plastic powder by a high-speed mixer; s2, monitoring the actual temperature rise slope d of the mixed plastic powder before entering a preplasticizing temperature rangexThe difference value with the temperature rise slope threshold value d' is obtained, and when the difference value meets the preset value, the step S3 is carried out; s3, continuously heating the mixed plastic powder to a preplasticizing temperature interval by the high-speed mixer, setting the duration of the preplasticizing temperature interval, and monitoring the actual preplasticizing temperature rise slope d of the mixed plastic powderiRegulating and controlling the operation frequency f' of the shearing tool bit of the high-speed mixer to ensure that the actual plasticizing temperature rise slope d in the preplasticizing temperature intervaliThe temperature rise slope allowable value d is the same as the temperature rise slope allowable value d; and S4, sending the mixed plastic powder subjected to preplasticizing into a cold mixing cylinder for rapid cooling. The invention fully ensures the heat exchange in the mixed plastic powder, thereby fully preplasticizing the mixed plastic powder and improving the performance of plastic products.
Description
Technical Field
The invention relates to the technical field of powder preplasticizing, in particular to a mixing control method for preplasticizing plastic powder.
Background
The existing plastic powder mixing equipment does not pay much attention to the pre-plasticizing process of mixed plastic powder, the mixed plastic powder is qualified as long as the mixing time is enough, if the material and the equipment are unstable, the temperature of the mixed plastic powder is too low or the pre-plasticizing time is insufficient, so that the pre-plasticizing of the mixed plastic powder cannot be well completed, and in the process of conveying the material to an extrusion or injection molding process, the components generated by the uniformly mixed material are layered and the like, so that the performance of a plastic product is seriously influenced. If the temperature rise of the mixed materials is too fast, the extrusion or injection molding quality of the product can be seriously influenced due to excessive consumption or denaturation of the stabilizer and the like.
Disclosure of Invention
The invention aims to overcome the defect that the performance of a plastic product is influenced because the temperature rise control is not carried out in the prior plastic powder preplasticizing process, and provides a mixing control method for preplasticizing plastic powder. The invention controls the operation frequency of the shearing cutter head of the high-speed mixer through the temperature rise condition of the plastic powder, and fully ensures the heat exchange in the mixed plastic powder, thereby fully preplasticizing the mixed plastic powder and improving the performance of plastic products.
In order to solve the technical problems, the invention adopts the technical scheme that: a mixing control method for preplasticizing plastic powder comprises the following steps:
s1, heating mixed plastic powder by a high-speed mixer;
s2, monitoring the actual temperature rise slope d of the mixed plastic powder before entering a preplasticizing temperature rangexIf the difference value does not accord with the preset value, the preplasticizing process is stopped, and if the difference value accords with the preset value, the step S3 is executed;
s3, continuously heating the mixed plastic powder to a preplasticizing temperature range by the high-speed mixer, and setting a temperature keeping rangeMonitoring the actual preplasticizing temperature rise slope d of the mixed plastic powder during the duration of the preplasticizing temperature intervaliRegulating and controlling the operation frequency f' of the shearing tool bit of the high-speed mixer to ensure that the actual plasticizing temperature rise slope d in the preplasticizing temperature intervaliThe temperature rise slope allowable value d is the same as the temperature rise slope allowable value d;
and S4, sending the mixed plastic powder subjected to preplasticizing into a cold mixing cylinder for rapid cooling.
Further, in step S2, the actual temperature rise slope dxThe difference with the temperature rise slope threshold value d 'is less than 0.1d', and the step S3 is executed, namely: | dx-d'|≤0.1d'。
Further, in step S3, the preplasticizing temperature range is [ T1,T2]Keeping the duration of the preplasticizing temperature interval as t, the temperature rise slope allowable value as d, and calculating the formula of d: d ═ T2-T1|÷t。
Further, in step S3, the period time of the mixed plastic powder is monitored as t1The mixed plastic powder is monitored for i monitoring periods t1Has a temperature change interval of [ Ti,Ti+1]Actual preplasticizing temperature rise slope diThe calculation formula of (2): di＝|Ti-Ti+1|÷t1。
Further, in step S3, when the actual plasticizing temperature rise slope diWhen the temperature rise slope allowable value d is larger than the temperature rise slope allowable value d, the operation frequency f' of the shearing tool bit is reduced; when the actual plasticizing temperature rises to a slope diAnd when the temperature rise slope allowable value d is smaller than the temperature rise slope allowable value d, increasing the operation frequency f' of the shearing tool head.
Further, in step S3, after the operation frequency f' of the cutting head is adjusted each time, the monitoring period t is waited for1Then comparing the actual plasticizing temperature rise slope diAnd the allowed value d of the temperature rise slope1And (4) until the mixed plastic powder is subjected to preplasticizing.
Compared with the prior art, the invention has the beneficial effects that:
the method can calculate the temperature rise slope of the mixed plastic powder during the pre-plasticizing period, and control the temperature rise process of the mixed plastic powder during the pre-plasticizing period; according toActual plasticizing temperature rise slope diCompared with the temperature rise slope allowable value d, the operation frequency f' of the shearing tool bit is changed, so that the heat exchange in the mixed plastic powder can be ensured, the mixed plastic powder is fully pre-plasticized, and the performance of a plastic product is improved.
Drawings
FIG. 1 is a flow chart of a mixing control method for preplasticizing plastic powder according to the present invention.
FIG. 2 shows the detailed steps of step 3 in FIG. 1.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
Fig. 1 to 2 show an embodiment of a mixing control method for preplasticizing plastic powder according to the present invention. A mixing control method for preplasticizing plastic powder comprises the following steps:
s1, heating mixed plastic powder by a high-speed mixer;
s2, monitoring the actual temperature rise slope d of the mixed plastic powder before entering a preplasticizing temperature rangexIf the difference value does not accord with the preset value, the preplasticizing process is stopped, and if the difference value accords with the preset value, the step S3 is executed;
s3, continuously heating the mixed plastic powder to a preplasticizing temperature interval by the high-speed mixer, setting the duration of the preplasticizing temperature interval, and monitoring the actual preplasticizing temperature rise slope d of the mixed plastic powderiRegulating and controlling the operation frequency f' of the shearing tool bit of the high-speed mixer to ensure that the actual plasticizing temperature rise slope d in the preplasticizing temperature intervaliThe temperature rise slope allowable value d is the same as the temperature rise slope allowable value d;
and S4, sending the mixed plastic powder subjected to preplasticizing into a cold mixing cylinder for rapid cooling.
In step S2, the actual temperature rise ramp dxThe difference with the temperature rise slope threshold value d 'is less than 0.1d', and the step S3 is executed, namely: | dx-d'|≤0.1d'。
In step S3, the preplasticizing temperature range is [ T1,T2]Keeping the duration of the preplasticizing temperature interval as t, the temperature rise slope allowable value as d, and calculating the formula of d: d ═ T2-T1|÷t。
In step S3, the mixed plastic powder is monitored for a period of time t1The mixed plastic powder is monitored for i monitoring periods t1Has a temperature change interval of [ Ti,Ti+1]Actual preplasticizing temperature rise slope diThe calculation formula of (2): di＝|Ti-Ti+1|÷t1。
In step S3, when the actual plasticizing temperature rise slope diWhen the temperature rise slope allowable value d is larger than the temperature rise slope allowable value d, the operation frequency f' of the shearing tool bit is reduced; when the actual plasticizing temperature rises to a slope diAnd when the temperature rise slope allowable value d is smaller than the temperature rise slope allowable value d, increasing the operation frequency f' of the shearing tool head.
In step S3, each time the operation frequency f' of the cutter head is adjusted, the period time t of the monitoring period is waited for1Then comparing the actual plasticizing temperature rise slope diAnd the temperature rise slope allowable value d until the mixed plastic powder is completely pre-plasticized.
The working principle of the embodiment is as follows: in the present embodiment, the actual plasticizing temperature rise slope d is comparediObtaining the temperature rise condition of the mixed plastic powder according to the temperature rise slope allowable value d, and if the temperature rise slope d is actually plasticizediIf the temperature rise slope allowable value d is larger than the temperature rise slope allowable value d, the temperature rise of the mixed plastic powder is too fast, and the operation frequency f' of the shearing cutter head needs to be reduced, so that the temperature rise of the mixed plastic powder is slowed down; if the actual plasticizing temperature rise slope diThe temperature rise slope allowable value d is smaller than, the operation frequency f' of the shearing tool bit needs to be increased, so that the temperature rise of the mixed plastic powder is accelerated; thus, the operation frequency f' of the shearing cutter head is controlled to ensure that the temperature rise process of the mixed plastic powder conforms to the expected process, the heat exchange in the mixed plastic powder is fully ensured,thereby leading the mixed plastic powder to be fully pre-plasticized and improving the performance of the plastic product.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A mixing control method for preplasticizing plastic powder is characterized in that: the method comprises the following steps:
s1, heating mixed plastic powder by a high-speed mixer;
s2, monitoring the actual temperature rise slope d of the mixed plastic powder before entering a preplasticizing temperature rangexIf the difference value does not accord with the preset value, the preplasticizing process is stopped, and if the difference value accords with the preset value, the step S3 is executed;
s3, continuously heating the mixed plastic powder to a preplasticizing temperature interval by the high-speed mixer, setting the duration of the preplasticizing temperature interval, and monitoring the actual preplasticizing temperature rise slope d of the mixed plastic powderiRegulating and controlling the operation frequency f' of the shearing tool bit of the high-speed mixer to ensure that the actual plasticizing temperature rise slope d in the preplasticizing temperature intervaliAnd the allowed value d of the temperature rise slope1The same;
and S4, sending the mixed plastic powder subjected to preplasticizing into a cold mixing cylinder for rapid cooling.
2. The mixing control method for preplasticizing plastic powders according to claim 1, characterized in that: in step S2, the actual temperature rise ramp dxThe difference with the temperature rise slope threshold value d 'is less than 0.1d', and the step S3 is executed, namely: | dx-d'|≤0.1d'。
3. The mixing control method for preplasticizing plastic powders according to claim 1, characterized in that: in step S3, the preplasticizing temperature range is [ T1,T2]Keeping the duration of the preplasticizing temperature interval as t, the temperature rise slope allowable value as d, and calculating the formula of d: d ═ T2-T1|÷t。
4. The mixing control method for preplasticizing plastic powders according to claim 1, characterized in that: in step S3, the mixed plastic powder is monitored for a period of time t1The mixed plastic powder is monitored for i monitoring periods t1Has a temperature change interval of [ Ti,Ti+1]Actual preplasticizing temperature rise slope diThe calculation formula of (2): di＝|Ti-Ti+1|÷t1。
5. The mixing control method for preplasticizing plastic powders according to claim 4, characterized in that: in step S3, when the actual plasticizing temperature rise slope diWhen the temperature rise slope allowable value d is larger than the temperature rise slope allowable value d, the operation frequency f' of the shearing tool bit is reduced; when the actual plasticizing temperature rises to a slope diAnd when the temperature rise slope allowable value d is smaller than the temperature rise slope allowable value d, increasing the operation frequency f' of the shearing tool head.
6. The mixing control method for preplasticizing plastic powders according to claim 5, characterized in that: in step S3, each time the operation frequency f' of the cutter head is adjusted, the period time t of the monitoring period is waited for1Then comparing the actual plasticizing temperature rise slope diAnd the temperature rise slope allowable value d until the mixed plastic powder is completely pre-plasticized.
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