CN114277617B - Cold pressing control method of forming die - Google Patents
Cold pressing control method of forming die Download PDFInfo
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- CN114277617B CN114277617B CN202111680030.8A CN202111680030A CN114277617B CN 114277617 B CN114277617 B CN 114277617B CN 202111680030 A CN202111680030 A CN 202111680030A CN 114277617 B CN114277617 B CN 114277617B
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- 238000003825 pressing Methods 0.000 title claims abstract description 189
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000000465 moulding Methods 0.000 claims abstract description 57
- 238000007493 shaping process Methods 0.000 claims description 7
- BULVZWIRKLYCBC-UHFFFAOYSA-N phorate Chemical compound CCOP(=S)(OCC)SCSCC BULVZWIRKLYCBC-UHFFFAOYSA-N 0.000 claims 1
- 210000001161 mammalian embryo Anatomy 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000001035 drying Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 210000002257 embryonic structure Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The invention provides a cold pressing control method of a forming die, which comprises the following steps: controlling the forming die to perform cold pressing for a first preset time T 1 And a first preset cold pressing pressure P 1 Cold pressing, wherein the first preset cold pressing time is controlled to be smaller than the set cold pressing time value T 0 Detecting the molding condition of a wet blank of a molding die; according to the molding condition of the wet blank of the molding die, the first preset cold pressing pressure P 1 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 . By adopting the technical scheme provided by the invention, the technical problem that wet blanks in a forming die in the prior art are easy to crush can be solved.
Description
Technical Field
The invention relates to the technical field of molding and drying of forming dies, in particular to a cold pressing control method of a forming die.
Background
At present, pulp molding is a three-dimensional papermaking technology, which takes pulp as a raw material, is generally obtained through preparation, molding, drying and shaping of pulp, and has the advantages of degradability, recoverability, environmental protection and the like. The paper plastic has the advantages of low cost and easy obtainment of raw materials, no pollution in the production process, good shock resistance, buffering, ventilation, antistatic performance, recoverability, easy degradation and the like, thereby having wide application prospect in the packaging fields of electronic products, daily chemicals, fresh food and the like.
In the production of pulp molding, the raw material is pulp fiber suspension with concentration less than 1%, and the dryness of the finished pulp molding is required to reach more than 90%; in pulp molding production, about 8-9.5kg of water is removed per kg of pulp molded product. Compared with vacuum dewatering and hot-pressing drying dewatering, cold pressing is a key element for saving energy, improving the dry and wet strength of products and reducing cost. However, when pulp is molded, the wet blank has low overall strength due to high water content, and is easy to crush.
Disclosure of Invention
The invention mainly aims to provide a cold pressing control method of a forming die, which aims to solve the technical problem that wet blanks in the forming die in the prior art are easy to crush.
In order to achieve the above object, the present invention provides a cold pressing control method of a forming die, comprising: controlling the forming die to perform cold pressing for a first preset time T 1 And a first preset cold pressing pressure P 1 Cold pressing, wherein the first preset cold pressing time is controlled to be smaller than the set cold pressing time value T 0 Detecting the molding condition of a wet blank of a molding die; according to the molding condition of the wet blank of the molding die, the first preset cold pressing pressure P 1 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 。
Further, the preset cold pressing pressure P is set according to the molding condition of the wet blank of the molding die 1 The method for adjusting comprises the following steps: when the forming die is detected to be crushed, the first preset cold pressing pressure P is reduced 1 Pressure value of (2); when the forming mold is detected to be in a forming state, controlling the forming mold to take a second preset time T 2 And a second preset cold-pressing pressure P 2 Cold pressing and controlling the second preset time T 2 Less than a set cold press time value T 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 2 ＞P 1 。
Further, the forming die is controlled to have a second preset time T2 and a second preset cold pressing pressure P 2 The cold pressing treatment method comprises the following steps: selecting T 2 ＝0.8T 1 。
Further, the forming die is controlled to have a second preset time T2 and a second preset cold pressing pressure P 2 Proceeding withThe cold pressing treatment method comprises the following steps: selecting P 2 ＝1.2P 1 。
Further, the forming die is controlled to be at a second preset time T 2 And a second preset cold-pressing pressure P 2 After the cold pressing treatment, the cold pressing control method further comprises the following steps: detecting the molding condition of a wet blank of a molding die; according to the shaping condition of the wet blank of the shaping mould, the second preset cold pressing pressure P is set 2 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 。
Further, the second preset cold pressing pressure P is set according to the molding condition of the wet blank of the molding die 2 The method for adjusting comprises the following steps: when the forming die is detected to be crushed, the second preset cold pressing pressure P is reduced 2 Pressure value of (2); when the forming mold is detected to be in a forming state, controlling the forming mold to take a third preset time T 3 And a third preset cold pressing pressure P 3 Cold pressing and controlling a third preset time T 3 Less than a second preset time T 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 3 ＞P 2 。
Further, a third preset time T is controlled 3 Less than a second preset time T 2 The method of (1) comprises: selecting T 3 ＝0.7T 2 。
Further, the forming die is controlled to be at a third preset time T 3 And a third preset cold pressing pressure P 3 The cold pressing treatment method comprises the following steps: selecting P 3 ＝1.2P 2 。
Further, the first preset cold pressing time is controlled to be smaller than the set cold pressing time value T 0 The method of (1) comprises: control and set the cold pressing time value T 0 The range of (2) is: t (T) 0 ≤5s。
Further, the forming die is controlled to be cold-pressed for a first preset cold-pressing time T 1 And a first preset cold pressing pressure P 1 When cold pressing treatment is carried out, the cold pressing control method further comprises the following steps: and carrying out vacuum suction on the cavity of the forming die to reduce the moisture of wet blanks in the cavity of the forming die.
By applying the technical scheme of the invention,by a first preset cold pressing time T 1 And a first preset cold pressing pressure P 1 Observing the structure subjected to cold pressing treatment, and based on the observed result, performing a first cold pressing pressure P 1 And a first preset cold pressing time T 1 The pulp molding machine is convenient to adjust, and can conveniently self-adjust the establishment time, the cold pressing pressure and the pulp molding dryness through multistage cold pressing, so that the pulp molding is ensured to remove redundant moisture by cold pressing as much as possible on the premise of not being crushed, and the energy consumption is reduced. Compared with a unit without the scheme, the unit weight product drying energy consumption can be reduced by 10-30%.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic flow chart of a cold press control method of a forming die according to an embodiment of the invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the present invention provides a cold press control method of a forming mold, the cold press control method of the forming mold comprising: controlling the forming die to perform cold pressing for a first preset time T 1 And a first preset cold pressing pressure P 1 Cold pressing, wherein the first preset cold pressing time is controlled to be smaller than the set cold pressing time value T 0 Detecting the molding condition of a wet blank of a molding die; according to the molding condition of the wet blank of the molding die, the first preset cold pressing pressure P 1 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 。
By applying such a method, by cold pressing for a first preset time T 1 And a first preset cold pressing pressure P 1 The structure subjected to cold pressing treatment was observed and was based onThe observed results are for a first cold pressing pressure P 1 And a first preset cold pressing time T 1 The pulp molding machine is convenient to adjust, and can conveniently self-adjust the establishment time, the cold pressing pressure and the pulp molding dryness through multistage cold pressing, so that the pulp molding is ensured to remove redundant moisture by cold pressing as much as possible on the premise of not being crushed, and the energy consumption is reduced. Compared with a unit without the scheme, the unit weight product drying energy consumption can be reduced by 10-30%. Therefore, the cold pressing control method of the forming die can solve the technical problem that wet blanks in the forming die in the prior art are easy to crush.
In the present embodiment, the preset cold pressing pressure P is set according to the molding condition of the wet blank of the molding die 1 The method for adjusting comprises the following steps: when the forming die is detected to be crushed, the first preset cold pressing pressure P is reduced 1 Pressure value of (2); when the forming mold is detected to be in a forming state, controlling the forming mold to take a second preset time T 2 And a second preset cold-pressing pressure P 2 Cold pressing and controlling the second preset time T 2 Less than a set cold press time value T 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 2 ＞P 1 . By adopting the setting method, the first preset cold pressing pressure P can be conveniently set according to the actual situation 1 And a first preset cold pressing time T 1 The method is suitable for adjustment, so that multistage cold pressing is conveniently and well carried out, crushing is avoided, and meanwhile, moisture contained in the wet embryo is removed as much as possible.
Typically, the first preset cold pressure P is reduced 1 In the pressure value of (2), a dichotomy is adopted, namely the first preset cold pressing pressure is reduced to half so as to prevent the first stage pressure P 1 The condition that wet embryo is crushed is caused by too high, so that the qualification rate of products is prevented from being influenced.
Specifically, the forming mold is controlled for a second preset time T 2 And a second preset cold-pressing pressure P 2 The cold pressing treatment method comprises the following steps: selecting T 2 ＝0.8T 1 . By adopting the method, the situation of molding crushing can be better avoided, and the excessive moisture can be removed better through cold pressing. In particular, when wetAfter the first-stage cold pressing, the pressurizing cold pressing time has little influence on the water content of the product, and the pressurizing cold pressing time can be increased to better discharge the water in the blank.
In the present embodiment, the molding die is controlled for a second preset time T 2 And a second preset cold-pressing pressure P 2 The cold pressing treatment method comprises the following steps: selecting P 2 ＝1.2P 1 . By adopting the method, the condition that the second preset cold pressing pressure is excessively increased to directly crush the molding is avoided. When the wet embryo is subjected to first-stage cold pressing, the increased cold pressing time has little influence on the water content of the product, and the water in the wet embryo can be better discharged by increasing the pressure. However, the pressure cannot be increased too fast, and it is generally preferable to set the pressure at 1.2 times.
Specifically, the forming mold is controlled for a second preset time T 2 And a second preset cold-pressing pressure P 2 After the cold pressing treatment, the cold pressing control method further comprises the following steps: detecting the molding condition of a wet blank of a molding die; according to the shaping condition of the wet blank of the shaping mould, the second preset cold pressing pressure P is set 2 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 . By adopting the method, the situation of crushing caused by overlong cold pressing time can be avoided.
In this embodiment, the second preset cold pressing pressure P is set according to the molding condition of the wet blank of the molding die 2 The method for adjusting comprises the following steps: when the forming die is detected to be crushed, the second preset cold pressing pressure P is reduced 2 Pressure value of (2); when the forming mold is detected to be in a forming state, controlling the forming mold to take a third preset time T 3 And a third preset cold pressing pressure P 3 Cold pressing and controlling a third preset time T 3 Less than a second preset time T 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 3 ＞P 2 . By adopting the setting method, the second preset cold pressing pressure P can be conveniently set according to the actual situation 2 And a second preset cold pressing time T 2 The adaptability adjustment is carried out, thereby being convenient for better carrying out multi-stage cold pressing, avoiding crushing and simultaneously removing the wet embryo as much as possibleIs a water content of (a) a water content of (b).
Specifically, a third preset time T is controlled 3 Less than a second preset time T 2 The method of (1) comprises: selecting T 3 ＝0.7T 2 . By adopting the method, the situation of molding crushing can be better avoided, and the excessive moisture can be removed better through cold pressing. When the wet embryo is subjected to first-stage cold pressing, the increased cold pressing time has little influence on the water content of the product, and the water in the wet embryo can be better discharged by increasing the pressure.
In the present embodiment, the molding die is controlled for a third preset time T 3 And a third preset cold pressing pressure P 3 The cold pressing treatment method comprises the following steps: selecting P 3 ＝1.2P 2 . By adopting the method, the situation that the third preset cold pressing pressure is excessively increased to directly crush the molding is avoided. When the wet embryo is subjected to first-stage cold pressing, the increased cold pressing time has little influence on the water content of the product, and the water in the wet embryo can be better discharged by increasing the pressure. However, the pressure cannot be increased too fast, and the effect is better when the pressure is generally 1.2 times.
Specifically, the first preset cold pressing time is controlled to be smaller than the set cold pressing time value T 0 The method of (1) comprises: control and set the cold pressing time value T 0 The range of (2) is: t (T) 0 And the time is less than or equal to 5 seconds. By adopting the setting method, the condition that the cold pressing pressure acts for too long can be avoided.
In the present embodiment, the forming mold is controlled to perform a first preset cold pressing time T 1 And a first preset cold pressing pressure P 1 When cold pressing treatment is carried out, the cold pressing control method further comprises the following steps: and carrying out vacuum suction on the cavity of the forming die to reduce the moisture of wet blanks in the cavity of the forming die. By adopting the method, the moisture in the wet embryo can be conveniently and better taken out, and the wet embryo is better dried.
According to the scheme, the problem that paper pulp molding is easy to crush due to the fact that the corresponding relation between the cold pressing pressure, the cold pressing time and the dryness of the paper pulp molding is established, and the paper pulp molding can remove as much water as possible during cold pressing, so that energy consumption during drying of the paper pulp molding is reduced.
According to the invention, different topological relations between cold pressing and time can be established according to different products, and the strength of the pulp molding wet blank product is generally in direct proportion to the dryness of the product. Firstly, when the pulp molding wet blank needs to be subjected to cold pressing, a lower cold pressing pressure is adopted in the 1 stage to prevent the product from being crushed, and when the wet blank has a certain dryness, the 2 stage cold pressing is started. After the 2-section cold pressing is finished, the cold pressing pressure is increased, and the 3-section cold pressing is started. And combining vacuum adsorption, and on the premise of allowing efficiency, removing excessive free moisture until cold pressing.
Control logic complements the description:
(1) First, a cold press time and a cold press pressure were empirically set for 1 stage.
(2) 1 section cold pressing pressure determination:
verifying whether the cold pressing pressure of the section 1 is feasible or not, and if the product is crushed, reducing the cold pressing pressure; otherwise, the cold pressing pressure is increased until the product is crushed, and the critical value of the crushed product is found to be 1-stage cold pressing pressure.
(3) And 1, determining the cold pressing time:
after a cold pressure is determined, a cold pressure time is determined. When the moisture content of the wet embryo does not change greatly along with the cold pressing time, the time point is 1 cold pressing time.
(4) 2 stage cold pressing pressure and time determination: reference 1 section;
(5) 3 sections of cold pressing pressure and time determination: reference 1 section;
the control logic may vary from product to product and the number of cold press stages may increase as product basis weight is higher. But typically does not exceed 5 segments in view of machine operating efficiency. The low-quantitative product is generally recommended to be 2 sections, and the high-quantitative product is generally recommended to be 3 sections.
The multistage cold pressing in this scheme can combine vacuum suction or hot pressing combined action, and this multistage cold pressing can increase and decrease the section number according to the product ration difference. In general, vacuum suction and hot pressing have a synergistic effect on reducing the moisture content of the wet embryo, so that the same product is used for comparison, and when the number of cold pressing sections of equipment which are both vacuum and cold pressing reaches the same moisture content, the number of sections of the equipment is smaller than that of the equipment which is only cold pressing, and the hot pressing is similar. When different amounts of wet embryos are pressed to the same moisture content, generally, the lower amount of pressure is smaller and the number of stages is smaller.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the automatic pulp molding machine can be convenient to automatically adjust the establishment time, the cold pressing pressure and the pulp molding dryness through multistage cold pressing, and ensures that the pulp molding is not crushed, and redundant moisture is removed by cold pressing as much as possible, so that the energy consumption is reduced.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A cold press control method of a forming die, comprising:
controlling the forming die to perform cold pressing for a first preset cold pressing time T 1 And a first preset cold pressing pressure P 1 Performing cold pressing treatment, performing vacuum suction on the cavity of the forming die to reduce the moisture of wet blanks in the cavity of the forming die, and controlling the first preset cold pressing time to be smaller than a set cold pressing time value T 0 Detecting the molding condition of the wet blank of the molding die;
according to the molding condition of the wet blank of the molding die, the first preset cold pressing pressure P is set 1 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than a set cold pressing time value T 0 。
2. The cold pressing control method of a forming die according to claim 1, wherein the preset cold pressing pressure P is set according to a forming condition of a wet blank of the forming die 1 The method for adjusting comprises the following steps:
when the forming die is detected to be crushed, the first preset cold pressing pressure P is reduced 1 Pressure value of (2);
when the forming mold is detected to be in a forming state, controlling the forming mold to take a second preset time T 2 And a second preset cold-pressing pressure P 2 Cold pressing treatment is carried out, and the second preset time T is controlled 2 Less than the set cold press time value T 0 ；
Wherein P is 2 ＞P 1 。
3. The cold press control method of a forming die according to claim 2, wherein the forming die is controlled to have a second preset time T2 and a second preset cold press pressure P 2 The cold pressing treatment method comprises the following steps:
selecting T 2 ＝0.8T 1 。
4. The cold press control method of a forming die according to claim 2, wherein the forming die is controlled for a second preset time T 2 And a second preset cold-pressing pressure P 2 The cold pressing treatment method comprises the following steps:
selecting P 2 ＝1.2P 1 。
5. The cold press control method of a forming die according to claim 1, wherein the forming die is controlled for a second preset time T 2 And a second preset cold-pressing pressure P 2 After cold pressing treatment, the cold pressing control method further comprises the following steps:
detecting the molding condition of the wet blank of the molding die;
according to the shaping condition of the wet blank of the shaping mold, the second preset cold pressing pressure P is carried out 2 Adjusting and controlling the cold pressing time corresponding to the adjusted cold pressing pressure to be smaller than the set cold pressing time value T 0 。
6. The cold press control method of a forming die according to claim 5, wherein the second preset cold press pressure P is set according to a forming condition of a wet blank of the forming die 2 The method for adjusting comprises the following steps:
when the forming die is detected to be crushed, the second preset cold pressing pressure P is reduced 2 Pressure value of (2);
when the forming mold is detected to be in a forming state, controlling the forming mold to take a third preset time T 3 And a third preset cold pressing pressure P 3 Cold pressing treatment is carried out, and the third preset time T is controlled 3 Less than the second preset time T 2 ；
Wherein P is 3 ＞P 2 。
7. The cold press control method of a forming die according to claim 6, wherein the third preset time T is controlled 3 Less than the second preset timeT 2 The method of (1) comprises:
selecting T 3 ＝0.7T 2 。
8. The cold press control method of a forming die according to claim 6, wherein the forming die is controlled to a third preset time T 3 And a third preset cold pressing pressure P 3 The cold pressing treatment method comprises the following steps:
selecting P 3 ＝1.2P 2 。
9. The cold press control method of a forming die according to claim 1, wherein the first preset cold press time is controlled to be smaller than a set cold press time value T 0 The method of (1) comprises:
control and set the cold pressing time value T 0 The range of (2) is: t (T) 0 ≤5s。
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| US5997785A (en) * | 1993-02-23 | 1999-12-07 | Skjelmose; Frank Ivan | Method for the manufacturing of a moulded body |
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