CN103711044A - Method for manufacturing moulded product of paper pulp - Google Patents
Method for manufacturing moulded product of paper pulp Download PDFInfo
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- CN103711044A CN103711044A CN201210374778.XA CN201210374778A CN103711044A CN 103711044 A CN103711044 A CN 103711044A CN 201210374778 A CN201210374778 A CN 201210374778A CN 103711044 A CN103711044 A CN 103711044A
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Abstract
The invention provides a method for manufacturing a moulded product of paper pulp. The method comprises the following steps of (a) injecting first paper pulp in a first net mold, and removing water in the first paper pulp so that a first wet blank is formed on the first net mold; (b) separating the first wet blank from the first net mold, and placing the first wet blank in a first mold which comprises a first upper mold and a first lower mold; and (c) performing hot pressing on the first wet blank between the first upper mold and the first lower mold so that a first moulded product of paper pulp is provided. By using the method, the moulded product of paper pulp is high in strength and low in water content, and has smooth surfaces.
Description
Technical field
The invention relates to a kind of method of manufacturing moulded paper pulp product.
Background technology
Day by day universal with person's environmental protection concept, the range of application of moulded paper pulp product is also increasingly extensive, and in fields such as food, medicine, daily use chemicals, industrial products, the example of its concrete application comprises industrial packaging (as the Shockproof packaging of electrical home appliances, glass ceramics, gift etc.), pallet (as the pallet of egg, fruit etc.), medical medical disposable material (as chamber pot, toilet seat pad, surgical tray etc.), flowerpot, toy (as mask), food containers (as dixie cup) and sheet material (as decorative wall panels) etc.
The manufacture method of existing moulded paper pulp product is by paper pulp being injected to net mould and for example to push or the mode of vacuum suction is removed moisture, to form wet base on net mould, the net mould with wet base carries out thermocompression forming and makes to this subsequently.Yet there are many shortcomings in this existing method.First, the mesh of net calligraphy or painting model body can make wet base when carrying out thermocompression forming, in paper pulp, contained sponge and net intermode produce inhomogeneous pressurized situation (with reference to figure 1, Fig. 1 is the part sectioned view of the pressurized situation of the string of wet base while being attached on net mould, as shown in the figure, pushing or during hot pressing, at the string 11 of mesh position P, not being subject to net mould 13 directly pushes), the not shortcoming such as consolidation of provided moulding article ubiquity moisture high (hot pressing not exclusively so that cannot comprehensively get rid of string contained humidity) and structure is provided, therefore the problem such as have the softening and long term storage of moisture-sensitive easily to produce to go mouldy.In addition, there is wire mark by unavoidable in the one side that wet base contacts with net mould, thereby the attractive in appearance of the moulded paper pulp product that provides is provided.Moreover, because net mould can repeat the power of being squeezed in preparation process, therefore its service life is short.
Summary of the invention
The invention provides a kind of method of manufacturing moulded paper pulp product, the moulded paper pulp product making thus has intensity and the inside and outside smooth surface of low water content, excellence.In addition, the method according to this invention, the net mould that the is used to form wet base power that can not be squeezed in the process of manufacturing moulded paper pulp product, so significantly promote its service life.
An object of the present invention is to provide a kind of method of manufacturing moulded paper pulp product, comprises:
(a) one first paper pulp is injected to one first net mould, and remove the moisture of this first paper pulp, to form one first wet base at this first net mould;
(b) this first wet base is separated with this first net mould and insert one first mould, this first mould comprises one first patrix and one first counterdie; And
(c) at this first patrix and this first wet base of this first time intermode hot pressing, so that one first moulded paper pulp product to be provided.
For above-mentioned purpose of the present invention, technical characterictic and advantage can be become apparent, below with the concrete embodiment that implements of part, be elaborated.
Accompanying drawing explanation
Fig. 1 is the part sectioned view that the string of wet base is attached on the pressurized situation on net mould;
Fig. 2 a is the profile of an embodiment of the prepared using compound pulp moulding article of method of the present invention;
Fig. 2 b is the profile of another embodiment of the prepared using compound pulp moulding article of method of the present invention.
Description of reference numerals:
11: string;
13: net mould;
21: the first moulded paper pulp products;
23: the second moulded paper pulp products;
25: joint;
P: mesh position.
The specific embodiment
Below will describe particularly according to part specific embodiment of the present invention; Only, do not deviating under spirit of the present invention, the present invention still can put into practice by multiple multi-form embodiment, protection domain of the present invention should not explained and is limited the representor of description institute.In addition, unless Wen Zhongyou illustrate in addition, (especially in aftermentioned patent claim) used in this manual " one ", " being somebody's turn to do " and similar term are interpreted as comprising odd number and plural form.
One feature of the method for manufacture moulded paper pulp product of the present invention is, before the extruding and/or hot-pressing processing of the base that wets, the base that first will wet is separated with net mould, the base that then will wet moves to and in hot pressing die, carries out hot pressing, therefore, the integral body of the string of wet base can be subject to uniform extruding, thereby makes that prepared moulded paper pulp product has that moisture is low, the equal advantage such as smooth of excellent strength and surfaces externally and internally.The prepared moulded paper pulp product of the inventive method is not only attractive in appearance and durability is better.In addition, the method according to this invention, the net mould power that can not be squeezed in manufacturing the process of moulded paper pulp product, so significantly promote its service life.
In specific words, the method for manufacture moulded paper pulp product of the present invention comprises:
(a) one first paper pulp is injected to one first net mould, and remove the moisture of this first paper pulp, to form one first wet base at this first net mould;
(b) this first wet base is separated with this first net mould and insert one first mould, this first mould comprises one first patrix and one first counterdie; And
(c) at this first patrix and this first wet base of this first time intermode hot pressing, so that one first moulded paper pulp product to be provided.
In step (a), can use any non-fashion of extrusion by the moisture removal of the first paper pulp, and in part embodiment of the present invention, be that the mode by vacuum suction realizes.In specific words, be in the formation mould with the first net mould, to inject the first paper pulp, make the first paper pulp cover the first net mould, wherein this formation mould is to have a plurality of pores in order to exhaust; Carry out subsequently vacuum suction, moisture is discharged by these pores, thereby make residual formed by plant fibre be attached to the first net mould, to obtain the desired first wet base.Except the mode of above-mentioned vacuum suction, also can adopt any known technology means to get rid of the moisture of the first paper pulp and form the first wet base.As for the shape of the first net mould, according to the shape of product wanting to make determine, there is no particular restriction.
The method according to this invention, in step (b), the first wet base is separated with the first net mould, insert subsequently in the first mould and in step (c) and separately the first wet base is carried out to hot pressing, thereby avoid problem that prior art meets with (, the string integral body of wet base cannot uniform-compression, causes that products made thereby intensity is not good, the life-span is short and outward appearance is furnished with wire mark).Described separation can be reached by any suitable mode, for example, in the part of the inventive method, implements in embodiment, is to carry out the separated first wet base and the first net mould by the mode of vacuum suction.In detail, that a shape and the first wet base absorption mould corresponding and that be furnished with a plurality of pores are approached to formation mould, carry out vacuum exhaust (subsequently, gas between absorption mould and the first wet base is discharged by pore), it is separated with the first net mould so that the first wet base is adsorbed on absorption mould, by this absorption mould, this first wet base is transferred in the first counterdie of the first mould subsequently, for carrying out follow-up thermocompression forming step.Except the mode of above-mentioned vacuum suction, also can adopt any known technology means to carry out the separated first wet base and the first net mould, with vacuum suction, be not limited.
In the step (c) of the inventive method, it is the first separated with the first net mould wet base of hot pressing between the first counterdie of the first mould and the first patrix, so that the string of the first wet base is more closely knit and further get rid of moisture, thereby make the first moulded paper pulp product, wherein, heater means is for reaching quick-drying effect.The first patrix and the first counterdie are to be respectively shape corresponding to male model and the master mold of the first wet base, can be furnished with equally pore, to promote exhaust (aqueous vapor) on it.Wherein, this area has and conventionally knows that the knowledgeable can be based on this description description and the paper pulp adopting composition and optionally adjust temperature and the plus-pressure of hot-pressing processing.Generally speaking, the temperature of hot-pressing processing can be approximately 140 ℃ to approximately 350 ℃, and plus-pressure can be approximately 5 tons to approximately 100 tons.
Method of the present invention, except the single member moulded paper pulp product of preparation, also can be used for preparing using compound pulp moulding article.Wherein, with as the operation of above-mentioned steps (a) to (c), prepare all parts of using compound pulp moulding article respectively, finally again by these component combinations.Wherein, the paper pulp that each parts adopt and net mould all can optionally be adjusted, can be identical or different.
In one of the inventive method, implement, in embodiment, to be to provide the double-deck using compound pulp moulding article of tool.Wherein, except above-mentioned steps (a) is to (c), also comprise:
(d) one second paper pulp is injected to one second net mould, and remove the moisture of this second paper pulp, to form one second wet base at this second net mould;
(e) this second wet base is separated with this second net mould and insert one second mould, this second mould comprises one second patrix and one second counterdie;
(f) at this second patrix and this second wet base of this second time intermode hot pressing, so that one second moulded paper pulp product to be provided; And
(g) combine this first moulded paper pulp product and this second moulded paper pulp product, to provide one to there is double-deck using compound pulp moulding article,
Wherein, step (d), (e) and mode of operation (f) respectively with step (a), (b) and (c) identical, and step (d), (e) and (f) and step (a), (b) and (c) independently carry out separately, for example, can or successively carry out simultaneously.And wherein, the first paper pulp and the second paper pulp can be identical or not identical, and the first net mould and the second net mould can be identical or not identical, are decided according to the actual requirements.
For example, with reference to figure 2a and Fig. 2 b, it is the embodiment of the double-deck combined type moulded paper pulp product of the prepared tool of the method according to this invention.As shown in 2a figure, capable of being combined have same material and identical shaped the first moulded paper pulp product 21 and the second moulded paper pulp product 23, so that the product that intensity is higher (as shown in Figure 2 a) to be provided; Or as shown in Figure 2 b, the first moulded paper pulp product 21 that shape capable of being combined is different and the second moulded paper pulp product 23 (both materials can be identical or not identical), to reach the effects such as heat insulation, insulation.The joint 25 of the first moulded paper pulp product 21 and the second moulded paper pulp product 23 can be fixed combination or free-standing combination.For example, can be by hot pressing or bonding mode by both pressings or bonding (fixed combination); Or, can be before use by both directly superimposed (free-standing in conjunction with).
Except the double-deck combined type moulded paper pulp product of above-mentioned tool, method of the present invention also can be used for manufacturing the using compound pulp moulding article of tool sandwich construction, or (for example provide the double-deck using compound pulp moulding article of other non-tools with other combinations, the first moulded paper pulp product and second can be articulated moulding article, to form the container of flip), only these simple change are that this area tool knows that the explanation of the knowledgeable based on this description can not complete person easily, do not add and repeats at this conventionally.
The method according to this invention, the kind of the paper pulp that adopts there is no particular restriction, as long as can form desired wet base on net mould.Common paper pulp example comprises wood pulp, sugarcane slurry, cotton pulp, jute pulp, bamboo pulp, reed pulp, rice straw pulp or aforesaid any combination.Separately, the inventor finds in paper pulp, to add alumina powder, further to improve intensity and the water resistance of products made thereby; And preferably, alumina powder has nano-scale, to be more firmly also attached to densely string surface.
The addition of the alumina powder in paper pulp there is no particular restriction.Generally speaking, the paper pulp of every 100 weight portions (in solid content), approximately 3 weight portions to the addition of approximately 45 weight portions can provide desired intensity and water proofing property improvement effect.In the situation that adding alumina powder, can further in paper pulp, add adhesive agent, with assisted oxidation aluminium powder, be attached on string.For example, the paper pulp of every 100 weight portions (in solid content), can add the plants starch of approximately 0.5 weight portion to the polyacrylamide of approximately 5 weight portions or approximately 1 weight portion to approximately 12 weight portions, but the kind of described adhesive agent and addition be not as limit.
In addition, also can in paper pulp, add polyethylene, as the solid of string, further to improve products made thereby intensity, its addition can be for example for the paper pulp (in solid content) of every 100 weight portions adds approximately 1 weight portion to approximately 45 weight portions, but not as limit.Certainly, also can in paper pulp, add other existing additives (as waterproof (grease proofing) agent), so that other gain effects (as waterproof oil-proof result) to be provided.
Hereby with following concrete enforcement embodiment, further illustrate the present invention, wherein, the method for measurement adopting is as follows respectively.
[strength test]
Intensity with ASTM D642, ISO 12048 and CNS 2543/3511 standard method of test test moulded paper pulp product.
[waterproofing tests]
Get two moulded paper pulp products respectively containing being immersed in normal-temperature water and 100 ℃ of boiling water, continue 60 minutes, detect respectively subsequently the moisture content of this two moulded paper pulp product, the lower person of moisture content represents that water proofing property is more excellent.
Embodiment: the preparation of moulded paper pulp product
< embodiment 1>
The paper pulp (comprising: bagasse pulp, straw pulp and reed pulp) that is 95 % by weight (take solid content) by the good concentration of pre-coordination injects a formation mould with the net mould that area is 100 square centimeters, and carry out vacuum suction to form wet base, in the mode of vacuum suction, make wet base separated with formation mould.Wet base is placed between the patrix of shaper and counterdie and carries out hot pressing (temperature: 170 ℃; Plus-pressure: 20 tons; Hot pressing time: 30 seconds), make moulded paper pulp product.Density, moisture content, thickness, intensity and the water proofing property of test moulded paper pulp product, and observe the smooth degree on moulded paper pulp product surface, and by outcome record in table 1.
< comparing embodiment 1>
In the mode identical with embodiment 1, prepare comparison moulded paper pulp product, only not separated wet base and net mould in advance, but directly the net mould with the base that wets be placed between the patrix of shaper and counterdie and carry out hot pressing.Test is density, moisture content, thickness, intensity and the water proofing property of moulded paper pulp product relatively, and the smooth degree on observation and comparison moulded paper pulp product surface, and by outcome record in table 1.
Table 1
As shown in Table 1, the prepared moulded paper pulp product of the inventive method, because wet base is subjected to comprehensive and average hot pressing effect in hot pressing, therefore the structure of the paper products that provide more fine and close (thickness is lower and density is higher) and moisture content are low, thereby there is more excellent intensity and water resistance (especially in the situation that Sheng is carried boiling water, its intensity and water resistance advantage are more remarkable), and more difficult generation go mouldy (because string in moisture extremely low).In addition, in the methods of the invention, owing to there is not net mould in wet base hot pressing, therefore prepared moulded paper pulp product has smooth outward appearance, without wire mark, have more market sale and be worth.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a method of manufacturing moulded paper pulp product, is characterized in that, comprises:
(a) one first paper pulp is injected to one first net mould, and remove the moisture of this first paper pulp, to form one first wet base in this first net mould;
(b) this first wet base is separated with this first net mould and insert one first mould, this first mould comprises one first patrix and one first counterdie; And
(c) at this first patrix and this first wet base of this first time intermode hot pressing, so that one first moulded paper pulp product to be provided.
2. method according to claim 1, is characterized in that, also comprises:
(d) one second paper pulp is injected to one second net mould, and remove the moisture of this second paper pulp, to form one second wet base at this second net mould;
(e) this second wet base is separated with this second net mould and insert one second mould, this second mould comprises one second patrix and one second counterdie;
(f) at this second patrix and this second wet base of this second time intermode hot pressing, so that one second moulded paper pulp product to be provided; And
(g) combine this first moulded paper pulp product and this second moulded paper pulp product, to provide a tool double-deck using compound pulp moulding article,
Wherein, this first paper pulp and this second paper pulp can be identical or not identical, and this first net mould and this second net mould can be identical or not identical.
3. method according to claim 1 and 2, is characterized in that, in step (a) and/or step (d), by vacuum suction to remove the moisture of this first paper pulp and/or this second paper pulp.
4. method according to claim 1 and 2, is characterized in that, in step (b) and/or (e), in the mode of vacuum suction, makes this first wet base separated with this first net mould and/or make this second wet base separated with this second net mould.
5. method according to claim 1 and 2, is characterized in that, in step (c) and/or (f), this hot pressing is carried out under the plus-pressure of the temperature of 140 ℃ to 350 ℃ and 5 tons to 100 tons.
6. method according to claim 1 and 2, it is characterized in that, this first paper pulp and/or this second paper pulp independently contain alumina powder, and the paper pulp that the content of this alumina powder is counted every 100 weight portions with solid content adds this alumina powder of 3 weight portion to 45 weight portions.
7. method according to claim 6, it is characterized in that, this first paper pulp and/or the second paper pulp independently contain polyacrylamide, and the paper pulp that the content of this polyacrylamide is counted every 100 weight portions with solid content adds this polyacrylamide of 0.5 weight portion to 5 weight portion.
8. method according to claim 6, it is characterized in that, this first paper pulp and/or this second paper pulp independently contain plants starch, and the paper pulp that the content of this plants starch is counted every 100 weight portions with solid content adds this plants starch of 1 weight portion to 12 weight portion.
9. method according to claim 6, is characterized in that, this first paper pulp and/or this second paper pulp independently contain polyethylene, and the paper pulp that this poly content is counted every 100 weight portions with solid content adds this polyethylene of 1 weight portion to 45 weight portion.
10. method according to claim 1 and 2, is characterized in that, this first paper pulp and/or this second paper pulp are independently selected from following group separately: wood pulp, sugarcane slurry, cotton pulp, jute pulp, bamboo pulp, reed pulp, rice straw pulp and aforesaid any combination.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210374778.XA CN103711044A (en) | 2012-09-29 | 2012-09-29 | Method for manufacturing moulded product of paper pulp |
| TW102120874A TWI544124B (en) | 2012-09-29 | 2013-06-13 | Method for manufacturing molded pulp product |
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| CN201210374778.XA CN103711044A (en) | 2012-09-29 | 2012-09-29 | Method for manufacturing moulded product of paper pulp |
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| CN103711044A true CN103711044A (en) | 2014-04-09 |
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Cited By (6)
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| CN106003883A (en) * | 2016-05-17 | 2016-10-12 | 蔡宗修 | Multilayer pulp blister |
| CN108060617A (en) * | 2017-12-25 | 2018-05-22 | 常州市诚鑫环保科技有限公司 | Midge automatic moulding machine and manufacturing method under layered product multistage |
| CN109457546A (en) * | 2018-11-09 | 2019-03-12 | 重庆凯成科技有限公司 | A kind of stacking paper production method |
| CN110565446A (en) * | 2019-08-30 | 2019-12-13 | 祝恒 | Mechanized manufacturing method of novel environment-friendly device combining woody fiber or herbaceous fiber and lacquer |
| CN115627662A (en) * | 2022-10-28 | 2023-01-20 | 张宝华 | Multilayer composite paper pulp bearing plate molding die and processing technology thereof |
| CN115897273A (en) * | 2022-11-16 | 2023-04-04 | 索兰德(无锡)科技有限公司 | Forming process of double-layer grouting paper pulp molding product |
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| TWI588319B (en) * | 2015-02-24 | 2017-06-21 | 金箭印刷事業有限公司 | Dredginging system for wet paper shaping, wet paper shape product and method for forming wet paper shape product |
| TWI607128B (en) * | 2015-05-28 | 2017-12-01 | 金箭印刷事業有限公司 | Transformable molding assembly and method of using the same |
| US9650746B2 (en) * | 2015-06-11 | 2017-05-16 | Golden Arrow Printing Co., Ltd. | Pulp molding process and paper-shaped article made thereby |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106003883A (en) * | 2016-05-17 | 2016-10-12 | 蔡宗修 | Multilayer pulp blister |
| CN108060617A (en) * | 2017-12-25 | 2018-05-22 | 常州市诚鑫环保科技有限公司 | Midge automatic moulding machine and manufacturing method under layered product multistage |
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| CN109457546A (en) * | 2018-11-09 | 2019-03-12 | 重庆凯成科技有限公司 | A kind of stacking paper production method |
| CN110565446A (en) * | 2019-08-30 | 2019-12-13 | 祝恒 | Mechanized manufacturing method of novel environment-friendly device combining woody fiber or herbaceous fiber and lacquer |
| CN115627662A (en) * | 2022-10-28 | 2023-01-20 | 张宝华 | Multilayer composite paper pulp bearing plate molding die and processing technology thereof |
| CN115897273A (en) * | 2022-11-16 | 2023-04-04 | 索兰德(无锡)科技有限公司 | Forming process of double-layer grouting paper pulp molding product |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI544124B (en) | 2016-08-01 |
| TW201413086A (en) | 2014-04-01 |
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Application publication date: 20140409 |