CN116200970A - Production method of narrow-mouth paper container - Google Patents
Production method of narrow-mouth paper container Download PDFInfo
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- CN116200970A CN116200970A CN202310149997.6A CN202310149997A CN116200970A CN 116200970 A CN116200970 A CN 116200970A CN 202310149997 A CN202310149997 A CN 202310149997A CN 116200970 A CN116200970 A CN 116200970A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 238000000465 moulding Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000008188 pellet Substances 0.000 claims description 21
- 229920003023 plastic Polymers 0.000 claims description 11
- 239000004033 plastic Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 239000002346 layers by function Substances 0.000 claims description 8
- 210000001161 mammalian embryo Anatomy 0.000 claims description 5
- 238000007731 hot pressing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims description 3
- 229920003189 Nylon 4,6 Polymers 0.000 claims description 3
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
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- 238000009423 ventilation Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
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- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
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
- D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
The invention relates to a production method of a narrow-mouth paper container and a die assembly for producing the narrow-mouth paper container; for the technical problem of the narrow-mouth paper container in industrialized batch production, the inventor abandons the low-solid-content paper pulp molding production process which is recognized by the skilled in the prior art, adopts the paper paste material with high solid content, and is matched with a special die assembly to prepare the narrow-mouth paper container through a die assembly hot-press molding process; the production method of the invention greatly reduces the drying time in the hot press forming process while simplifying the production process, and achieves the purposes of saving production energy consumption and shortening the production period of products.
Description
Technical Field
The invention relates to a production method of a narrow-mouth paper container, belonging to the technical field of paper packaging container production.
Background
With the implementation of laws and regulations such as global carbon reduction and emission reduction and plastic inhibition, innovative development of plastic packaging substitutes at home and abroad is not short and emerging like spring bamboo shoots after rain, wherein the functional paper-based packaging has the advantages of being renewable, recyclable and biodegradable and environment-friendly, and the functional paper-based packaging stands out in numerous technical schemes of carbon reduction and emission reduction and plastic pollution reduction, and is concerned by various social circles.
In the past, glass bottles and plastic bottles have been used for packaging liquid products such as beverages, mineral water, seasonings (liquid), and milk. The glass bottle has high energy consumption, is fragile and has limited application scenes; the plastic bottle is difficult to degrade after being used, and is not in line with the environmental protection development requirement. The paper-based nature of narrow mouth plastic bottles such as beverage bottles, seasoning bottles, milk, medicine bottles and the like in paper-based plastic is one of the important targets for which various experts in the packaging industry have pursued technology attack in recent years.
For example, a new paper wine bottle is introduced by british company, and the production technology is that of a paper bottle shell molded by paper pulp, a movable plastic liner is adopted inside, the paper bottle is essentially only a bottle-shaped paper plastic composite package, and the paper bottle is not directly used as a liquid container, so that the paper bottle is not a paper bottle in the full sense.
The publication No. CN114351511A discloses a method for manufacturing paper pulp bottles, which adopts the current hot pulp molding production process to manufacture paper pulp bottles. However, when the process condition is applied to actual industrial production, some technical problems exist, for example, the raw materials adopted in the production method are aqueous solutions mainly containing paper fibers, the solid content of the aqueous solutions is about 1%, wet slurry films with the solid content of 20-40% are required to be formed in a mould by utilizing high-power vacuum pump suction, and the wet slurry films are prepared by long-time pressing and high-temperature drying; in actual industrial production, the production energy consumption is very high, which is not consistent with the advocacy principles of energy conservation, carbon reduction and emission reduction in the industrial chain.
In addition, the process of forming the inner cavity of a narrow mouth paper container, such as demolding a male mold forming the inner cavity, has been a technical problem in the art.
Therefore, it is desirable for those skilled in the art to develop a process that is specific to narrow mouth paper containers and can be adapted for industrial mass production.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method of a narrow-mouth paper container, which comprises a process of clamping a male die and a female die for hot press molding, wherein,
the male die is a rigid male die which is matched with the inner cavity of the narrow-mouth paper container by injecting a proper number of hard pellets into the flexible bag body, vacuumizing the inside of the flexible bag body, sealing the inside of the flexible bag body, and keeping the negative pressure state of the inside of the flexible bag body;
the inner part of the female die forms a molding cavity matched with the outer surface of the narrow-mouth paper container;
the production method comprises the following steps:
step 1), manufacturing wet embryo: uniformly spreading the paper paste material on the inner wall surface of the molding cavity or uniformly wrapping the paper paste material on the outer surface of the male mold to form a wet blank; the solid content of the paper paste material is 50% -80%;
and 2) die assembly, hot press molding: closing and locking the male die and the female die, wherein the wet blank manufactured in the step 1) is positioned in a space between the male die and the female die, and performing high-temperature hot pressing until the wet blank is dried and molded to obtain the narrow-mouth paper container;
step 3), demolding: releasing the negative pressure state in the flexible bag body, taking out or pouring out the hard pellets in the flexible bag body, and vacuumizing the interior of the flexible bag body so as to take out the flexible bag body.
Preferably, the production method further comprises step 4) of forming a functional layer with resistance on the inner surface of the narrow mouth paper container; preferably, the functional layer has any one or more functions of water resistance, oil resistance, oxygen insulation, acid and alkali resistance and organic solvent resistance.
Preferably, in the step 2), the hot press molding is performed under a temperature of 120 to 200 ℃ and a pressure of 800 to 4000 kpa.
Preferably, the bag body part of the flexible bag body is made of a polytype plastic material which can withstand the temperature of 80-260 ℃ and the internal and external pressure difference of 800-4000 kpa.
Preferably, the bag body part of the flexible bag body is made of PPS, PA46, LCP, PEEK or silica gel.
Preferably, the hard pellets are pellets having a uniform diameter, and the diameter falls within the range of 0.5 to 1.5 mm.
Preferably, after the flexible bag body of the male die is vacuumized, the negative pressure in the flexible bag body is minus 60kpa to minus 100kpa.
In another aspect, the present invention provides a mold assembly for producing narrow mouth paper containers, wherein the mold assembly comprises a male mold and a female mold;
the male die is a rigid male die which is matched with the inner cavity of the narrow-mouth paper container by injecting a proper number of hard pellets into the flexible bag body, vacuumizing the inside of the flexible bag body and sealing the inside of the flexible bag body;
the interior of the female mold forms a molding cavity that mates with the outer surface of the narrow mouth paper container.
Preferably, the female die comprises a left female die and a right female die which are symmetrically arranged, and an inner cavity formed by clamping the left female die and the right female die is the molding cavity.
Preferably, a plurality of ventilation channels with the width of 0.10-0.8mm are arranged on the inner wall surface of the molding cavity.
The invention relates to a production method of a narrow-mouth paper container and a die assembly for producing the narrow-mouth paper container; for the technical problem of the narrow-mouth paper container in industrialized batch production, the inventor abandons the low-solid-content paper pulp molding production process which is recognized by the skilled in the prior art, adopts the paper paste material with high solid content, and is matched with a special die assembly to prepare the narrow-mouth paper container through a die assembly hot-press molding process; the production method of the invention greatly reduces the drying time in the hot press forming process while simplifying the production process, and achieves the purposes of saving production energy consumption and shortening the production period of products.
Drawings
FIG. 1 shows the process of making a male mold of example 1 of the present invention, comprising the three steps of FIGS. 1a-1 c;
fig. 2 shows steps 1) and 2) of the method for producing a narrow mouth paper container according to example 1 of the present invention, corresponding to fig. 2a and 2b, respectively;
fig. 3 shows the demolding process of step 3 of the narrow mouth paper container production method of example 1 of the present invention, and fig. 3a to 3c correspond to the three states of demolding, respectively.
Detailed Description
The present invention will be further illustrated by the following examples, but the present invention is not limited to these specific embodiments.
And (3) notes: the parts present in the embodiments, unless indicated otherwise, are parts by weight.
Example 1
The method of producing a narrow mouth paper container of embodiment 1, comprising a process of clamping a male mold and a female mold and hot-press molding.
Wherein the interior of the female mould 20 forms a moulding cavity 21 adapted to the outer surface of a narrow mouth paper container.
In one embodiment of the present invention, the male mold 10 is a rigid male mold 10 adapted to the inner cavity of the narrow mouth paper container by injecting a proper number of hard pellets 2 into the flexible bag 1, vacuum-pumping the inside of the flexible bag 1, and sealing the inside of the flexible bag, and maintaining the negative pressure state of the inside of the flexible bag.
In particular in this embodiment, the male mould 10 comprises a flexible bag body 1, a rigid evacuation tube 4 and a sealing cover 5; the flexible bag body 1 comprises a bag body part (not labeled in the figure) and a stop part 3 which is annularly arranged outside the bag mouth; the lower port of the rigid evacuation tube 4 is located inside the bag portion, and the upper port is located outside the bag portion and connected to a vacuum pump device (not shown in the figure); the sealing cover 5 is fixedly arranged on the outer peripheral surface of the rigid vacuumizing tube 4 and is detachably connected with the stop part 3 in a sealing fit manner.
In particular in this embodiment, with respect to the process of making the male die 10, as shown in fig. 1 (fig. 1a-1 c), the process includes the steps of a) injecting the hard pellets 2; step b), shaping the vacuumizing male die 10; step c) opening the mold to take out the male mold 10.
Specifically, referring to fig. 1a, the hard pellets 2 are injected in step a). In this embodiment, a shaping mold 30 (i.e. a female mold adapted to the shape of the male mold 10) for manufacturing the male mold 10 is adopted, the shaping mold 30 is composed of two symmetrically arranged left and right molds 30x and 30y, and a cavity formed after the left and right molds 30x and 30y are clamped is adapted to the shape of the male mold 10 finally manufactured and molded. The left die 30x and the right die 30y are clamped, a bag body part (not labeled) of the flexible bag body 1 is placed in the cavity, a stop part 3 which is annularly arranged outside the bag opening is supported on the upper end surface of the shaping die 30, and the left die 30x and the right die 30y are locked at the same time, so that the flexible bag body 1 is fixed; then, inserting a rigid evacuation tube 4 into the flexible bag 1, wherein the upper port of the rigid evacuation tube 4 is positioned outside the bag body part and connected with a vacuum pump device (not shown in the figure); a seal cover 5 fixedly provided on the outer peripheral surface of the rigid evacuation tube 4 is detachably and sealingly engaged with the stopper 3. When in the condition of fig. 1a, the sealing cap 5 is separated from the stopper 3 (uncapped condition), and the operator injects a suitable number of hard pellets 2 into the interior of the bag body of the flexible bag body 1.
Referring to fig. 1b, the vacuum-drawn male die 10 is shaped; the rigid evacuation tube 4 is inserted downward, and the sealing cover 5 is sealingly engaged with the stopper 3 (closed state), thereby closing the other portions except for the "rigid evacuation tube 4" at the mouth of the bag. The vacuum pump device (the vacuum pump device connected with the upper port of the rigid vacuumizing tube 4) is started, the inside of the flexible bag body 1 is vacuumized, after the male die 10 is shaped, the upper port of the rigid vacuumizing tube 4 is sealed, so that the negative pressure state of the inside of the flexible bag body 1 is maintained, and the rigid male die 10 is manufactured and formed.
Referring to fig. 1c, the left mold 30x and the right mold 30y are separated by opening the molds, thereby taking out the produced rigid male mold 10.
In one embodiment of the present invention, the flexible bag 1 is made of a polytype plastic material capable of withstanding temperatures of 80-260 ℃ and capable of withstanding internal and external pressure differences of 800-4000 kpa.
For example, PPS, PA46, LCP, PEEK, or silicone rubber may be selected as the material of the bag portion of the flexible bag 1. In this embodiment, PPS is selected as the material of the bag portion of the flexible bag 1.
In one embodiment of the present invention, the hard pellets are pellets having a uniform diameter and a diameter falling within the range of 0.5 to 1.5 mm.
In a specific embodiment of the invention, after the flexible bag body of the male die is vacuumized, the negative pressure in the flexible bag body is between-60 kpa and-80 kpa.
The parameters such as the structure of the male mold 10, the material of the bag body part, the diameter of the hard pellets, the negative pressure degree and the like can be selected by those skilled in the art according to the specific requirements such as the shape and the size of the paper container to be manufactured.
In addition, as for the method for manufacturing the male mold 10, other alternative or modified methods may be adopted by those skilled in the art, and any method that adopts the method of injecting the hard pellets 2 into the flexible bag body 1 and vacuuming the inside of the flexible bag body 1 to form a rigid male mold is within the scope of the present invention.
The method for producing the narrow mouth paper container of example 1, as shown in fig. 2 (fig. 2a to 2 b), comprises the steps of:
step 1), manufacturing wet embryo: as shown in fig. 2a, a paper paste material is uniformly spread on the inner wall surface of the molding cavity 21 of the female mold 20 to form a wet blank P; wherein, the solid content of the adopted paper paste material (namely the blank of the narrow-mouth paper container) is 50-80 percent.
In this embodiment, as shown in fig. 2a, the female die 20 includes a left female die 20x and a right female die 20y that are symmetrically arranged, and an inner cavity formed after the left female die 20x and the right female die 20y are closed, that is, a molding cavity 21.
Specifically, in this embodiment, as shown in fig. 2a, before the left female die 20x and the right female die 20y are clamped, the paper paste material is uniformly spread on the inner wall surfaces of the left female die 20x and the right female die 20y, respectively.
The paper paste material (blank) has higher solid content (50% -80%), is not easy to flow and is in paste form.
One skilled in the art can empirically, when spreading the blank, blank may be left blank in the edge portions of the inner wall surfaces of the left and right female molds 20x and 20y, leaving the blank to be stretched under hot pressing to the blank-left portion in the subsequent mold-closing hot press molding process.
In another alternative embodiment of the present invention, the paper paste material is uniformly wrapped around the outer surface of the rigid male mold 10 to form a wet blank.
And 2) die assembly, hot press molding: closing and locking the male die 10 and the female die 20, wherein the wet blank P manufactured in the step 1) is positioned in a space between the male die 10 and the female die 20; and (5) carrying out high-temperature hot pressing until the material of the wet blank P is dried and formed, and obtaining the narrow-mouth paper container.
Specifically, in this embodiment, the rigid male mold 10 manufactured as described above is placed in the molding cavity 21 loaded with the wet blank P, and after the mold is closed and locked, the material of the wet blank P is pressed at high temperature until it is dried and molded, thereby obtaining a narrow-mouth paper container.
In particular, in the present embodiment, as shown in fig. 2a to 2b, the left female mold 20x and the right female mold 20y on which the blanks are spread are clamped on both sides of the rigid male mold 10 manufactured as described above, whereby the rigid male mold 10 is placed into the molding cavity 21 in which the wet blanks P are loaded.
In a specific embodiment of the present invention, in the step 2), the hot press molding conditions are a temperature of 120 to 200 ℃ and a pressure of 800 to 4000 kpa.
Specifically, in the present embodiment, a plurality of ventilation channels with a width of 0.10-0.8mm are provided on the inner wall surface of the molding cavity 21 (or the inner wall surfaces of the left female die 20x and the right female die 20 y); the wet embryo P is expanded and flows under high temperature and high pressure to be combined, the generated vapor is dispersed and overflowed through a plurality of vapor permeable channels on the inner wall surface of the molding cavity 21 until the material of the wet embryo P is completely dried and molded, and the dry molded narrow-mouth paper container is obtained.
In particular, in the embodiment, the blank adopts a paper paste material with high solid content (50% -80%), so that the blank can be finished only in 10-80 seconds under the conventional hot press forming condition, and the dry formed narrow-mouth paper container is obtained.
Compared with the production process adopting low-solid-content pulp molding in the prior art, the scheme of the invention can greatly reduce the drying time (shorten the production period), save the production energy consumption, greatly simplify the production process flow and is more suitable for industrialized mass production.
Step 3), demolding: and releasing the negative pressure state in the flexible bag body 1, taking out or pouring out the hard pellets 2, and vacuumizing the inside of the flexible bag body 1, so as to take out the flexible bag body 1.
In this embodiment, as shown in fig. 3a, the upper port of the rigid evacuation tube 4 is opened to release the negative pressure state inside the flexible bag 1; the sealing cap 5 is then opened to be separated from the stopper 3. The female die 20 is then controlled to reverse so as to pour out the hard pellets 2 in the flexible bag 1.
In this embodiment, as shown in fig. 3b, the vacuum pump device (the vacuum pump device connected to the upper port of the rigid evacuation tube 4) is turned on again, and the interior of the flexible bag body 1 is evacuated, so that the bag body portion of the flexible bag body 1 is condensed; as shown in fig. 3c, the flexible bag 1 is taken out (pulled out ) from the narrow mouth of the dry-formed narrow mouth paper container.
In a specific embodiment of the present invention, the production method of the present invention further comprises step 4) of forming a functional layer having resistance on the inner surface of the narrow mouth paper container. Preferably, the functional layer has any one or more functions of water resistance, oil resistance, oxygen insulation, acid and alkali resistance and organic solvent resistance.
As a method for forming a resistant functional layer on the inner surface of a narrow-mouth paper container, there are various methods of manufacturing, for example, a functional coating can be obtained by spraying a functional coating on the inner surface of a container through a nozzle penetrating into the container, and drying at a certain temperature; for example, glue can be adhered to the inner surface of the container, then the film with resistance (PE, PP or other environment-friendly degradable films) is vacuumized and folded and then sent into the container, then gas is filled into the film, and the stretched film is adhered to the inner wall surface of the container through the glue, so that a resistance functional layer is obtained; other means known in the art may also be employed.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The production method of the narrow-mouth paper container comprises a process of clamping and hot-press molding a male die and a female die, and is characterized in that:
the male die is a rigid male die which is matched with the inner cavity of the narrow-mouth paper container by injecting a proper number of hard pellets into the flexible bag body, vacuumizing the inside of the flexible bag body, sealing the inside of the flexible bag body, and keeping the negative pressure state of the inside of the flexible bag body;
the inner part of the female die forms a molding cavity matched with the outer surface of the narrow-mouth paper container;
the production method comprises the following steps:
step 1), manufacturing wet embryo: uniformly spreading the paper paste material on the inner wall surface of the molding cavity or uniformly wrapping the paper paste material on the outer surface of the male mold to form a wet blank; the solid content of the paper paste material is 50% -80%;
and 2) die assembly, hot press molding: closing and locking the male die and the female die, wherein the wet blank manufactured in the step 1) is positioned in a space between the male die and the female die, and performing high-temperature hot pressing until the wet blank is dried and molded to obtain the narrow-mouth paper container;
step 3), demolding: releasing the negative pressure state in the flexible bag body, taking out or pouring out the hard pellets in the flexible bag body, and vacuumizing the interior of the flexible bag body so as to take out the flexible bag body.
2. A method of producing a narrow mouth paper container as claimed in claim 1, wherein:
the production method further comprises the step 4) of forming a functional layer with resistance on the inner surface of the narrow-mouth paper container; preferably, the functional layer has any one or more functions of water resistance, oil resistance, oxygen insulation, acid and alkali resistance and organic solvent resistance.
3. A method of producing a narrow mouth paper container as claimed in claim 1, wherein:
in the step 2), the conditions of the hot press molding are a temperature of 120 to 200 ℃ and a pressure of 800 to 4000 kpa.
4. A method of producing a narrow mouth paper container as claimed in claim 1, wherein: the bag body part of the flexible bag body is made of a polytype plastic material which can withstand the temperature of 80-260 ℃ and the internal and external pressure difference of 800-4000 kpa.
5. The method for producing a narrow mouth paper container according to claim 4, wherein: the bag body part of the flexible bag body is made of PPS, PA46, LCP, PEEK or silica gel.
6. The method for producing a narrow mouth paper container according to claim 4, wherein: the hard pellets are pellets with uniform diameters, and the diameters of the hard pellets fall into the range of 0.5-1.5 mm.
7. The method for producing a narrow mouth paper container according to claim 6, wherein: after the flexible bag body of the male die is vacuumized, the negative pressure in the flexible bag body is minus 60kpa to minus 80kpa.
8. A die assembly for producing narrow mouth paper containers, characterized by: the die assembly comprises a male die and a female die;
the male die is a rigid male die which is matched with the inner cavity of the narrow-mouth paper container by injecting a proper number of hard pellets into the flexible bag body, vacuumizing the inside of the flexible bag body and sealing the inside of the flexible bag body;
the interior of the female mold forms a molding cavity that mates with the outer surface of the narrow mouth paper container.
9. The mold assembly of claim 8, wherein: the female die comprises a left female die and a right female die which are symmetrically arranged, and an inner cavity formed by the left female die and the right female die after the left female die and the right female die are clamped is the molding cavity.
10. The mold assembly of claim 9, wherein: a plurality of ventilation channels with the width of 0.10-0.8mm are arranged on the inner wall surface of the molding cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310149997.6A CN116200970B (en) | 2023-02-22 | 2023-02-22 | Production method of narrow-mouth paper container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310149997.6A CN116200970B (en) | 2023-02-22 | 2023-02-22 | Production method of narrow-mouth paper container |
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| CN116200970A true CN116200970A (en) | 2023-06-02 |
| CN116200970B CN116200970B (en) | 2024-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119871953A (en) * | 2025-01-06 | 2025-04-25 | 中国建筑材料科学研究总院有限公司 | Forming die and method for large-size curved-surface rigid aerogel material |
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|---|---|---|---|---|
| US6461480B1 (en) * | 1998-02-23 | 2002-10-08 | Kao Corporation | Method of manufacturing pulp mold formed product |
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| CN119871953B (en) * | 2025-01-06 | 2025-12-12 | 中国建筑材料科学研究总院有限公司 | Forming die and method for large-size curved-surface rigid aerogel material |
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| CN116200970B (en) | 2024-09-20 |
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