CN109371762B - Pulp molding product, mold thereof and narrow runway process method - Google Patents
Pulp molding product, mold thereof and narrow runway process method Download PDFInfo
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- CN109371762B CN109371762B CN201811281040.2A CN201811281040A CN109371762B CN 109371762 B CN109371762 B CN 109371762B CN 201811281040 A CN201811281040 A CN 201811281040A CN 109371762 B CN109371762 B CN 109371762B
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- pulp
- suction
- runway
- cavity
- slurry
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000000465 moulding Methods 0.000 title claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 description 6
- 238000004513 sizing Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
Abstract
The invention discloses a pulp molding die, which comprises at least two independent cavities, wherein the bridging positions of adjacent runways in the independent cavities are runway pulp suction cavity units, and the other parts are non-runway pulp suction cavity units; a vacuum suction pump is independently arranged in the non-runway pulp suction cavity unit of each independent cavity; meanwhile, the narrow runway process method using the mold is also disclosed, comprising the steps that the pulp sucking mold is immersed below the pulp liquid level, and the vacuum suction pumps in the independent cavities suck pulp under negative pressure of-0.15 MPa to-0.20 MPa; when the slurry in the position corresponding to the non-runway slurry suction cavity unit is saturated, the vacuum suction pump sucks the slurry under the negative pressure of-0.10 MPa to-0.15 MPa, the method has strong operability, and the produced molded product is uniformly sized and cannot deform.
Description
Technical Field
The invention relates to the technical field of pulp molded products, in particular to a pulp molded product, a mold thereof and a narrow runway process method.
Background
The paper pulp molding with plant fiber as main material is one kind of paper product with complicated shape and high size precision and through molding with paper pulp in pulp state, and this can be produced into paper product with complicated shape and high size precision. Therefore, the packaging material is widely used for packaging articles which are fragile, breakable, or need to avoid extrusion, such as foods, electronics, accessories, or glass products.
Therefore, the paper film product for packaging is required to have high strength, the die is realized through a die parting cavity structure, but the die parting cavity structure is not adopted at present, meanwhile, the narrowest part of the die structure part used at present can only have the width of more than 10mm and the height of 15mm, so that the size of the whole paper holder can be larger, and the cost is relatively high; for the portion of the runway bridge that is narrower in width, there is the problem that thick part thick paste has adhesion because of uneven paste suction.
Disclosure of Invention
Therefore, the invention aims to provide the mold with the split cavity structure, so that the cost is obviously saved on the premise that the paper support size of a molded product meets the requirement, and the mold meets the market requirement better.
Meanwhile, the invention also provides a production process for manufacturing the molded product by using the mold, the process has strong operability, and the whole slurry of the produced product is uniform.
The invention provides a pulp molding die, which comprises at least two independent cavities, wherein the bridge positions of adjacent runways in the independent cavities are runway pulp suction cavity units, and the other parts are non-runway pulp suction cavity units;
and a vacuum suction pump is independently arranged in the non-runway pulp suction cavity unit of each independent cavity.
Optionally, the runway pulp suction cavity unit and the non-runway pulp suction cavity unit are separated by a partition plate with the aperture of 0.5-1.0 mm and the micropore spacing of 1.0-1.5 mm.
Optionally, the suction holes correspondingly arranged in the runway pulp suction cavity units of the independent cavities are distributed in a linear array, and one end of each suction hole penetrates through one side wall of the pulp suction mold and extends to the outer wall of the pulp suction mold; the suction holes of the non-runway pulp suction cavity units of the independent cavities are arranged in a surrounding mode, and one end of each suction hole penetrates through one side wall of the pulp suction mold and extends to the outer wall of the pulp suction mold.
Optionally, the runway pulp suction cavity unit has suction holes with a hole diameter of 2.0 mm-3.0 mm.
Optionally, the non-runway pulp suction cavity unit has suction holes with a bore diameter of 1.5mm to 2.5 mm.
The invention also provides a narrow runway process method based on the die, which comprises the following steps:
The pulp sucking mould is immersed below the pulp liquid level, and a vacuum suction pump arranged in each independent cavity sucks pulp under negative pressure of-0.15 MPa to-0.20 MPa for 20s to 60s;
When slurry in the corresponding position of the runway slurry sucking cavity unit of the independent cavity is saturated, the vacuum suction pump sucks the slurry under negative pressure of-0.10 MPa to-0.15 MPa, and the slurry sucking time is 20 s-40 s.
Optionally, the vacuum suction pump continues to suck the pulp for 20 to 40 seconds under negative pressure of minus 0.05MPa to minus 0.10MPa after the second pulp sucking is finished.
Optionally, the slurry saturation is 55% -65%.
The pulp molded product manufactured by the die or the method comprises at least two molded products with at least two cavities formed by at least two independent cavities, wherein the runway bridge width between the molded products with the two cavities is less than 7mm, and the pulp sucking thickness is 1.5-2 mm when the height is greater than 14 mm.
The technical scheme of the invention has the following advantages:
1. The pulp molding die comprises at least two independent cavities, wherein each independent cavity is provided with a vacuum suction pump which is independent, the independent cavities are divided into a runway pulp suction cavity unit adjacent to a runway bridging position and a non-runway pulp suction cavity unit, the units are separated by a separation plate, and due to micropores on the separation plate, when the vacuum suction pump is under the action of negative pressure, the non-runway pulp suction cavity unit normally sucks pulp, and the runway pulp suction cavity unit gradually increases the sizing amount from the lower sizing amount to the higher sizing amount due to the action of the separation plate, and the sizing amount is balanced with the thickness of other parts, so that the problem that the sizing amount of a runway bridging part is excessively large in a short time to generate the multi-adhesion of the sizing amount of the runway part is avoided in the process; the divider plate is integrally formed with the cavity such that the separate cavities form two units. Specifically, when the vacuum suction pump makes the cavity generate certain negative pressure, the aperture of the micropores on the partition plate is 0.5 mm-1.0 mm, the micropore spacing is 1.0 mm-1.5 mm, and the micropores are distributed in a linear array, and optimally when the aperture of the micropores is 1.0mm and the micropore spacing is 1.2mm, the suction volume of the runway bridging part cannot be too small or interrupted, and the whole suction speed is influenced.
2. When the slurry sucking problem of the runway bridging position is guaranteed, the runway slurry sucking cavity units arranged on the cavities of the independent cavities are provided with the air sucking holes with the aperture of 2.0-3.0 mm, the non-runway slurry sucking cavity units are provided with the air sucking holes with the aperture of 1.5-2.5 mm, the density of the air sucking holes is increased to a certain extent, the slurry sucking amount is increased, and the strength of molded products is increased.
3. The invention also provides a narrow runway process method based on the mould, which comprises the steps that when the pulp sucking mould is immersed below the pulp liquid level, a vacuum suction pump arranged in each independent cavity sucks pulp under negative pressure of-0.15 MPa to-0.20 MPa, and the pulp sucking time is 20s to 60s; and then, when the slurry at the position corresponding to the non-runway slurry suction cavity unit is saturated, the vacuum suction pump continues to suck the slurry under the negative pressure of minus 0.10MPa to minus 0.15MPa, and the slurry suction time is 20s to 40s. The first pulp sucking process enables pulp sucking of the corresponding position of the non-runway pulp sucking cavity unit of the independent cavity to be basically completed, meanwhile, the pulp at the runway bridging position is slowly adhered to the surface of the die, the negative pressure of the runway pulp sucking cavity unit is larger and larger in the second pulp sucking process, and the pulp sucking quantity is increased on the basis of the original, so that the thickness of the pulp is basically equal to that of other positions. More preferably, when the suction amount is close to saturation, the suction is continued for 20 s-40 s under negative pressure of minus 0.05MPa to minus 0.10MPa, the suction amount is stable, and the suction amount of each side wall and the bottom of the molded product is saturated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a mold structure according to the present invention;
FIG. 2 is a schematic view of the molded article of FIG. 1 after the suction of the mold slurry is completed.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The pulp molding die of the embodiment is shown in fig. 1, and comprises two independent cavities, a vacuum suction cavity A and a vacuum suction cavity B, wherein the two cavities are provided with negative pressure by respective vacuum suction pumps, when the two vacuum suction pumps are fixedly connected with the vacuum suction cavity A and the vacuum suction cavity B, sealing rings are arranged around connecting joints, the sealing rings are made of elastic rubber, the adjacent runway bridging positions 301 of the vacuum suction cavity A and the vacuum suction cavity B are runway pulp suction cavity units 102 and 202, the other parts are non-runway pulp suction cavity units 101 and 201, the two units are separated by a separation plate with the aperture of 0.5mm, the separation plate with the aperture spacing of 1.5mm, the separation plate and the cavities are integrally molded, suction holes correspondingly arranged on the runway pulp suction cavity units are distributed in a linear array, and one end of each sealing ring penetrates through one side wall of the pulp molding die and extends to the outer wall of the pulp molding die; the suction holes of the non-runway pulp suction cavity units of the independent cavities are arranged in a surrounding mode, and one end of each suction hole penetrates through one side wall of the pulp suction mold and extends to the outer wall of the pulp suction mold; wherein, the runway pulp suction cavity unit is provided with a suction hole with the aperture of 2.0mm, and the non-runway pulp suction cavity unit is provided with a suction hole with the aperture of 2.5 mm.
The pulp sucking process of the pulp sucking mould comprises the following steps:
s1, a pulp sucking mould is arranged on the upper side of a pulp groove, the saturation of pulp is 55% -65%, the pulp sucking mould is immersed below the liquid level of the pulp groove, and a vacuum suction cavity sucks pulp under negative pressure of-0.15 MPa for 20s;
s2, when slurry suction saturation is carried out on slurry at positions corresponding to the runway suction cavity units of the vacuum suction cavity A and the vacuum suction cavity B, the vacuum suction pump continues to suck the slurry under negative pressure of-0.15 MPa, and the slurry suction time is 40s;
s3, after the vacuumizing is finished, removing the pulp suction mould after the pulp in the groove is cooled and solidified, so that a product is obtained, and the product is shown in the figure 2.
Example 2
The pulp molding die of this example, see FIG. 1, comprises two independent cavities, and is otherwise the same as example 1, wherein the pore diameter of the micropores on the partition plate is 1.0mm, and the distance between the micropores is 1.0 mm; the runway pulp suction cavity units of the vacuum suction cavity A and the vacuum suction cavity B are provided with suction holes with the aperture of 3.0mm, and the non-runway pulp suction cavity units are provided with suction holes with the aperture of 1.5 mm.
The pulp sucking process of the pulp sucking mould comprises the following steps:
S1, arranging the upper side of a slurry groove, immersing a slurry suction mold below the liquid level of the slurry groove, wherein the saturation degree of the slurry is 55-65%, and sucking the slurry under negative pressure of-0.20 MPa by a vacuum suction pump arranged in each independent cavity for 60s;
S2, when slurry in the corresponding position of the runway slurry suction cavity unit of the independent cavity is saturated, the vacuum suction pump sucks the slurry under negative pressure of-0.10 MPa, and the slurry suction time is 40s;
S3, continuously sucking the slurry for 20s under negative pressure of-0.05 MPa by a vacuum suction pump;
s4, after the vacuumizing is finished, removing the pulp suction mould after the pulp in the groove is cooled and solidified, so that a product is obtained.
Example 3
The pulp molding die of this example, see FIG. 1, comprises two independent cavities, and is otherwise the same as that of example 1, wherein the pore diameter of the micropores on the partition plate is 0.8mm, and the distance between the micropores is 1.0 mm; the runway pulp suction cavity units of the vacuum suction cavity A and the vacuum suction cavity B are provided with suction holes with the aperture of 2.5mm, and the non-runway pulp suction cavity units are provided with suction holes with the aperture of 2.0 mm.
The pulp sucking process of the pulp sucking mould comprises the following steps:
S1, arranging the upper side of a slurry groove, immersing a slurry suction mold below the liquid level of the slurry groove, wherein the saturation degree of the slurry is 55-65%, and sucking the slurry under negative pressure of-0.20 MPa for 40s by a vacuum suction pump arranged in each independent cavity;
S2, when slurry in the corresponding position of the runway slurry suction cavity unit of the independent cavity is saturated, the vacuum suction pump sucks the slurry under negative pressure of-0.15 MPa, and the slurry suction time is 30s;
S3, continuously sucking pulp for 40s under negative pressure of-0.10 MPa by a vacuum suction pump;
s4, after the vacuumizing is finished, removing the pulp suction mould after the pulp in the groove is cooled and solidified, so that a product is obtained.
The thickness structure is further enhanced at the local position through the pulp sucking mould, so that the thickness of the product is increased, the product is stronger, the defect that the strength of the existing product is low and the like is overcome, and the problem of product deformation is improved to a certain extent.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (5)
1. A pulp molding die is characterized in that,
The device comprises at least two independent cavities, wherein the adjacent runway bridging positions in the independent cavities are runway pulp suction cavity units, and the other parts are non-runway pulp suction cavity units;
a vacuum suction pump is independently arranged in the non-runway pulp suction cavity unit of each independent cavity;
the runway pulp suction cavity unit and the non-runway pulp suction cavity unit are separated by a partition plate with the aperture of 0.5 mm-1.0 mm and the micropore spacing of 1.0 mm-1.5 mm;
The runway pulp suction cavity units of the independent cavities are correspondingly provided with suction holes which are distributed in a linear array, and one end of each suction hole penetrates through one side wall of the pulp suction mold and extends to the outer wall of the pulp suction mold; the suction holes of the non-runway pulp suction cavity units of the independent cavities are arranged in a surrounding mode, and one end of each suction hole penetrates through one side wall of the pulp suction mold and extends to the outer wall of the pulp suction mold;
The runway pulp suction cavity unit is provided with a suction hole with the aperture of 2.0 mm-3.0 mm;
The non-runway pulp suction cavity unit is provided with a suction hole with the aperture of 1.5 mm-2.5 mm.
2. The narrow track process method of a pulp molding die as claimed in claim 1, comprising the steps of:
The pulp sucking mould is immersed below the pulp liquid level, and a vacuum suction pump arranged in each independent cavity sucks pulp under negative pressure of-0.15 MPa to-0.20 MPa for 20 s-60 s;
And when the slurry at the position corresponding to the non-runway slurry suction cavity unit is saturated, the vacuum suction pump sucks the slurry under negative pressure of-0.10 MPa to-0.15 MPa, and the slurry suction time is 20 s-40 s.
3. The narrow runway process method of the pulp molding die according to claim 2, further comprising continuing to suck pulp for 20 s-40 s under negative pressure of-0.05 MPa to-0.10 MPa by the vacuum suction pump after the second pulp suction is completed.
4. A narrow track process for pulp moulding moulds according to claim 2 or 3, characterised in that the slurry saturation is 55-65%.
5. A pulp moulded product manufactured by the mould or the method according to any one of claims 1-4, comprising at least two cavity moulded products formed by at least two independent cavities, wherein the runway bridge width between the two cavity moulded products is less than 7mm, and the pulp suction thickness is 1.5 mm-2 mm when the height is greater than 14 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811281040.2A CN109371762B (en) | 2018-10-30 | 2018-10-30 | Pulp molding product, mold thereof and narrow runway process method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811281040.2A CN109371762B (en) | 2018-10-30 | 2018-10-30 | Pulp molding product, mold thereof and narrow runway process method |
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| CN109371762A CN109371762A (en) | 2019-02-22 |
| CN109371762B true CN109371762B (en) | 2024-05-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111074693B (en) * | 2019-12-12 | 2021-07-13 | 永发（河南）模塑科技发展有限公司 | Secondary pulp absorption compensation technical method for eliminating surface defects of pulp molding product |
| CN110983867B (en) * | 2019-12-30 | 2022-04-29 | 永发（河南）模塑科技发展有限公司 | Equipment and method for solving back side pulp hanging problem of paper pulp forming product |
| CN110983863B (en) * | 2019-12-31 | 2021-12-10 | 永发（河南）模塑科技发展有限公司 | Local thickening forming equipment for pulp molding product and production method thereof |
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