A paper-plastic integrated bottle, a forming mold, an apparatus, and a production process

Abstract

A kind of mould of paper pulp molding integrated bottle shell, including suction system, extrusion system and hot-press forming system, it also relates to the process for preparing paper bottle shell using mould, after forming wet embryo in suction cavity using suction system, the moisture content and thickness of wet embryo are controlled by extrusion of elastomer air bag of extrusion system;Then using elastomer air bag in hot-press forming system to pass into pressurized fluid and cooperate with hot-press lower die to carry out hot-press drying, to obtain integrated paper bottle shell, it also relates to a kind of production equipment and production process of plastic liner paper bottle, production equipment includes paper bottle shell forming area containing mould, paper bottle shell cutting area, plastic bottle blank area and liner loading area, when using, the plastic bottle embryo prefabricated in plastic bottle blank area is attached in paper bottle shell by blow molding process, paper bottle with plastic liner is compared with existing plastic bottle, greatly reduce the use of plastic.

Description

TECHNICAL FIELD

[0001] The present application relates to the forming technology field of paper-plastic formed products, in particular to the development of a mold, equipment, process and product of a paper-plastic integrated bottle. BACKGROUND

[0002] The existing paper-plastic bottle product process is to use two half bottles to be formed and then bonded by glue or to bond the bottle opening and bottle bottom again after a paper tube is bonded. The process is forming, glue coating, pressing, and cutting the excess edge. Patent CN201320746431 discloses a paper-plastic bottle, which comprises a bottle body and a plastic end head arranged on the upper part of the bottle body. The bottle body is a paper tube with an upward opening. The lower edge of the plastic end head is tightly connected with the opening of the paper tube to close the inner cavity of the paper tube. Patent CN201420833805 discloses a liquid storage bottle with a connecting ring, which comprises a paper bottle. An inner container for storing liquid is arranged in the paper bottle. The paper bottle comprises a first half cavity and a second half cavity arranged oppositely. The first half cavity and the second half cavity are connected to form an inner cavity for accommodating the inner container through a connecting ring. The above process flow is long, the process is complex, the cost is high, and the glue coating is not easy to decompose, resulting in poor environmental performance. In order to reduce the cost of the paper-plastic bottle and improve the environmental performance to meet the environmental requirements, the present application designs a whole paper-plastic bottle forming process. The whole paper-plastic bottle forming process of the present application only has two steps of forming and cutting waste materials, reduces processes such as glue coating and pressing, greatly improves the environmental performance of the product, reduces the cost of the paper-plastic bottle, and is convenient for mass promotion.

[0003] The raw material of paper pulp molding is various types of fiber materials, which is widely sourced and easy to collect, and does not cause obstacles to the environment and recycling. In addition to excellent environmental performance, the paper pulp molding has good forming performance. Because the production process relies on the development of molds, various shapes can be made to meet the requirements. However, due to the characteristics of paper, it will be quickly wetted and lose its function after contacting liquid. How to reduce the use of plastic to meet environmental requirements and enable the bottle to store liquid for a long time has become the focus of the present application. SUMMARY

[0004] In order to solve the above problems, the present application applies an elastomer material resistant to high temperature and high pressure to the design of a paper-plastic mold, and at the same time improves the production method of the existing paper pulp molding structure by blowing a plastic inner container in the paper-plastic bottle shell, thereby achieving the purpose of reducing the use of plastic and enabling the bottle to store liquid for a long time.

[0005] An innovative in-bottle grouting process is used to solve the grouting process of the bottle. The paper-plastic mold is made of a new elastomer and the whole mold design includes an extrusion mold and a hot pressing upper mold. Therefore, a plastic layer is needed in the paper bottle for the storage of internal liquid. The present application specifically adopts the following technical scheme:

[0006] A mold for a paper-plastic integrated bottle comprises a suction system, an extrusion system and a hot-pressing system. The suction system is used to form a wet bottle blank by injection molding and to form a wet blank after suction by vacuumizing the wet bottle blank formed by injection molding. The extrusion system is used to form a preformed paper bottle by extrusion with an elastomer air bag. The hot-pressing system is used to form an integrated paper bottle by extrusion with an elastomer air bag.

[0007] Specifically, the suction system comprises an injection molding template, an injection molding cavity and a suction template. The suction template has a concave cavity consistent with the shape of the bottle. The injection molding template is located above the concave cavity and connected with the injection molding cavity. The injection molding cavity has an extension part provided with injection molding tube holes. The extension part extends into the concave cavity of the suction template, and the wet bottle blank is formed by injection molding through the injection molding tube holes. The suction template is provided with suction holes and a suction cavity. The suction holes are arranged on the surface of the concave cavity and connected with the suction cavity. The suction cavity is connected with a vacuum device, and the wet bottle blank formed by injection molding is formed into a wet blank after suction by vacuumizing.

[0008] Further, the injection molding cavity is connected with a paper pulp pool. The paper pulp can be selected from sugarcane pulp, bamboo pulp and wood pulp.

[0009] Further, the extension part is uniformly provided with injection molding tube holes.

[0010] Further, a pulp supplementing device is provided. If there is an uneven part of the paper pulp, the wet bottle blank formed by injection molding through the injection molding tube holes is supplemented by the pulp supplementing device.

[0011] Specifically, the injection molding template and the suction template form a bottle cavity. The suction template is composed of suction half-templates.

[0012] Further specifically, the suction holes on the surface of the concave cavity correspond to the bottle mouth, the bottle neck, the bottle body and the bottle bottom part of the bottle cavity respectively. The density of the suction holes of the bottle mouth, the bottle neck and the bottle body part is greater than that of the bottle bottom part.

[0013] The extrusion system is composed of an extrusion mold, a pressurizing cavity, an elastomer air bag, a suction template and a wet blank after suction. The pressurizing cavity is arranged in the extrusion mold and connected with the elastomer air bag. The extrusion mold is arranged above the suction template and forms a bottle cavity with the suction template. The wet blank after suction is placed in the bottle cavity. The elastomer air bag extends into the wet blank placed in the bottle cavity. After the mold is closed, the elastomer air bag is pressurized and expanded to extrude the wet blank and adhere to the inner wall of the bottle cavity to form a preformed paper bottle.

[0014] Further, the elastomer air bag is pressurized by high-pressure gas, water pressure or oil pressure, etc. to play a role of draining water and preforming for the inner cavity of the wet blank after suction.

[0015] Specifically, the extrusion die and the suction die form a bottle cavity, and the suction die is composed of a suction die half.

[0016] The hot-pressing system is composed of a hot-pressing upper die, a pressurized cavity, an elastomer air bag, a hot-pressing lower die and a preformed paper bottle. The pressurized cavity is arranged in the hot-pressing upper die and connected with the elastomer air bag. The hot-pressing upper die is arranged above the hot-pressing lower die and forms a bottle cavity with the hot-pressing lower die. The preformed paper bottle is arranged in the bottle cavity. The elastomer air bag extends into the preformed paper bottle arranged in the bottle cavity. After the mold is closed, the elastomer air bag is pressurized and expanded to extrude the preformed paper bottle against the inner wall of the bottle cavity to form an integrated paper bottle.

[0017] Further, the elastomer air bag is pressurized by high-pressure gas, water pressure or oil pressure, etc. to play a role of draining water and forming in the inner cavity of the preformed paper bottle, thereby ensuring the completion of the forming of the paper blank.

[0018] Specifically, the hot-pressing upper die and the hot-pressing lower die form a bottle cavity, and the hot-pressing lower die is composed of a bottle body part and a bottle bottom part.

[0019] The hot-pressing lower die is made of a breathable material and can be polished, and the water vapor at high temperature is quickly discharged to dry the product quickly. Specifically, the hot-pressing die is made of a breathable steel. The micro holes of the breathable steel material can absorb water vapor to achieve the purpose of rapid exhaust.

[0020] The elastomer air bag is made of a material resistant to high pressure and high temperature. The elastomer air bag in the extrusion system and the hot-pressing system can be the same or different.

[0021] The hot-pressing system is also provided with a hot-pressing device to heat and pressurize the system.

[0022] The process of the paper plastic integrated bottle using the above mold includes the following steps:

[0023] (1) Assemble the suction system to be in a closed mold state. Inject pulp into the part of the bottle cavity through the injection hole of the injection cavity and the extension part to make the pulp in the bottle cavity sufficient and uniform;

[0024] The injection can be jetting, grouting, in-bottle stirring and suction or cylinder throwing.

[0025] If the pulp is not uniform, the pulp is supplemented by a pulp supplementing device.

[0026] (2) Start the vacuum equipment to extract vacuum through the suction cavity to make the paper pulp uniformly adsorbed on the surface of the suction mold to form a wet blank after suction;

[0027] Specifically, the water content of the wet blank is controlled to be about 70% to 80% and the thickness is about 2.5 mm.

[0028] (3) The wet embryo after absorbing the pulp is transferred to the extrusion system, the wet embryo after absorbing the pulp is placed in the bottle cavity, the elastomer air bag extends into the wet embryo placed in the bottle cavity, after the mold is closed, the elastomer air bag is pressurized and expanded to extrude the wet embryo to form a preformed paper bottle on the inner wall of the bottle cavity; after the molding is completed, the pressurizing gas or liquid is discharged to take out the elastomer air bag.

[0029] The control pressure of the elastomer air bag is 1 kgf, so that the moisture content of the preformed paper bottle is 40% to 50%, and the thickness is 1.5 mm.

[0030] The elastomer air bag can apply different pressures according to different product requirements.

[0031] (4) The preformed paper bottle is transferred to the hot press forming system, the preformed paper bottle is placed in the bottle cavity, the elastomer air bag extends into the preformed paper bottle placed in the bottle cavity, after the mold is closed, the elastomer air bag is pressurized and expanded to extrude the preformed paper bottle to be attached to the inner wall of the bottle cavity, and the hot press forming is an integrated paper bottle, and after the molding is completed, the pressurizing gas or liquid is discharged to take out the elastomer air bag.

[0032] The thickness of the product is different, and the moisture content is different, for example, the moisture content of the finished product is 3% to 5%, and the thickness is about 1.0 mm.

[0033] The hot press forming system is heated to 150 DEG C by the hot press mold, and the pressurization of the elastomer air bag is about 5 kgf, which can be adjusted according to the requirements of the product.

[0034] In order to reduce the use of plastic and enable the bottle to store liquid for a long time, the application provides a production equipment of a plastic liner paper bottle, which comprises the forming of a paper bottle shell and the loading of a liner, and specifically as follows:

[0035] The equipment is divided into a paper bottle shell forming area, a paper bottle shell cutting area, a plastic bottle blank area and a liner loading area. The paper bottle shell forming area is divided into the above-mentioned pulp suction system, the extrusion system and the hot press forming system, and the integrated paper bottle shell is formed after forming. The paper bottle that meets the unified standard size is cut through the cutting area and combined with the plastic liner in the liner loading area, and finally a complete paper bottle is formed.

[0036] The elastomer member controlled by the pressurizing pump and the high-temperature liquid is used in the hot press forming area, which can dry and shape the inside of the paper bottle shell. The paper bottle shell is affected by the hot press mold, and the hot press mold performs air extraction and high temperature to dry and shape the outside of the paper bottle.

[0037] The paper bottle shell cutting area standardizes the size of the paper bottle shell to form a unified specification shell.

[0038] The plastic bottle blank area sends the prefabricated bottle blank to the liner loading area for processing.

[0039] In the inner container loading area, the paper bottle shell is in the blow molding mold, and the plastic bottle blank can be directly attached to the paper bottle shell when the blow head puts the plastic bottle blank into the blow molding mold for processing.

[0040] The application also claims a production process of a plastic inner container paper bottle, including: preparing the paper-plastic integrated bottle; preparing a plastic bottle blank in the plastic bottle blank area; in the inner container loading area, the paper-plastic integrated bottle is placed in the blow molding mold, and the plastic bottle blank is directly attached to the paper bottle shell when the blow head puts the plastic bottle blank into the blow molding mold for blow molding.

[0041] The paper bottle structure made by the application uses 100% paper-plastic product as the strength support of the shell, and uses 0.1mm-0.05mm thick plastic as the inner container to protect the liquid and achieve safety (food safety, daily chemical product field, etc.) and solve the problem of liquid penetration of paper, thereby achieving a solution of reducing more than 70% of plastic to contribute to environmental protection and plastic reduction. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structure schematic diagram of the grouting system of the application;

[0043] Figure 1 a is a structure schematic diagram of the grouting system of the application in the open mold state;

[0044] Figure 1 b is a structure schematic diagram of the grouting system of the application in the closed mold state;

[0045] Figure 2 is a structure schematic diagram of the suction system of the application;

[0046] Figure 2 a is a structure schematic diagram of the suction system of the application in the open mold state;

[0047] Figure 2 b is a structure schematic diagram of the suction system of the application in the closed mold state;

[0048] Figure 3 is a structure schematic diagram of the hot pressing system of the application;

[0049] Figure 3 a is a structure schematic diagram of the hot pressing system of the application in the open mold state;

[0050] Figure 3 b is a structure schematic diagram of the hot pressing system of the application in the closed mold state;

[0051] Figure 4 is a whole layout diagram of the whole set of equipment of the application;

[0052] Figure 5 is a schematic diagram of the wet blank transferred from the suction mold to the hot pressing mold when the paper bottle shell is formed;

[0053] Figure 6 is a schematic diagram of the suction process of the second case of the suction process of the present application;

[0054] Figure 7 is a schematic diagram of the wet blank transfer process of the second case of the suction process of the present application;

[0055] Figure 8 is a schematic diagram of the hot press forming of the wet blank when forming the paper bottle shell of the present application;

[0056] Figure 9 is a schematic diagram of the transfer of the dried shell from the hot press mold to the next process when forming the paper bottle shell of the present application;

[0057] Figure 10 is a schematic diagram of the paper bottle shell after the cutting process of the present application;

[0058] Figure 11 is a schematic diagram of the combination of the plastic inner liner and the paper bottle shell of the present application;

[0059] Figure 12 is the empty bottle pressure resistance test of the bottle prepared in Example 5 of the present application;

[0060] The upper left graph is an empty bottle pressure resistance test graph, the upper right graph is an empty bottle after testing, and the lower graph is an empty bottle pressure resistance test curve graph;

[0061] Figure 13 is the water-filled bottle pressure resistance test of the bottle prepared in Example 5 of the present application;

[0062] The upper left graph is a water-filled bottle pressure resistance test graph, the upper right graph is a water-filled bottle after testing, and the lower graph is a water-filled bottle pressure resistance test curve graph.

[0063] In the figure, the following are the parts of Example 1-4:

[0064] 1-pouring mold, 2-pouring cavity, 3-pouring tube hole, 4-suction mold, 5-suction hole, 6-suction cavity, 7-wet blank, 8-extrusion mold, 9-pressing cavity, 10-elastic body air bag, 11-suction mold, 12-hot press upper mold, 13-hot press lower mold, 15-paper plastic bottle, 21-extension, 81-paper bottle, 91-pressing cavity, 92-bottle body part, 93-bottle bottom part;

[0065] Example 5 part: 41-suction mold A, 42-suction mold B, 16-elastic member, 17-roller, 19-cutting piece, 101-blowing mold, 102-blowing head, 103-plastic bottle blank, 104-roller, 104a-toothed structure, 17a-toothed structure, 105-robot, 51-paper bottle shell forming area, 52-paper bottle shell cutting area, 53-inner liner loading area, 54-plastic bottle blank area. DETAILED DESCRIPTION

[0066] The application will be further described in connection with the accompanying drawings Figure 1 a-3b, 4-11 and specific examples 1-5. EXAMPLE

[0067] The application will be further described in connection with the accompanying drawings Figure 1 The structure of the injection molding system in open and closed mold state is described in a-3b, 4-11 and specific examples 1-5. The injection molding system comprises an injection mold plate 1, an injection cavity 2 and a suction mold plate 4. The suction mold plate 4 has a concave cavity consistent with the shape of the bottle. The injection mold plate 1 is above the concave cavity. The injection mold plate 1 and the suction mold plate 4 form a bottle cavity. The suction mold plate 4 is composed of suction mold half plates. The injection mold plate 1 is connected to the injection cavity 2. The injection cavity has an extension 21. The extension 21 has an injection tube hole 3. The extension 21 extends into the concave cavity of the suction mold plate 4. The injection tube hole 3 is used to inject pulp to form a wet bottle embryo 7. The suction mold plate has suction holes 5 and a suction cavity 6. The suction holes 5 are on the surface of the concave cavity and connected to the suction cavity 6. The suction holes 5 on the surface of the concave cavity correspond to the bottle mouth, bottle neck, bottle body and bottle bottom of the bottle cavity respectively. The density of the suction holes in the bottle mouth, bottle neck and bottle body is greater than that in the bottle bottom. The suction cavity 6 is connected to a vacuum device (not shown). In the closed mold state, the injection cavity 2 and the injection tube hole 3 of the extension 21 are used to spray pulp to the parts of the bottle cavity. The pulp is sugarcane pulp. The pulp in the bottle cavity is sufficient and uniform. The vacuum device (not shown) is started. The suction cavity 6 is used to extract vacuum to make the pulp uniformly adsorbed on the surface of the suction mold to form a wet embryo 7 after suction. The electromagnetic valve and pressure gauge are used to control the vacuum extraction of about 0.7 Mpa. The moisture content of the wet embryo is controlled at about 70% to 80% and the thickness is about 2.5 mm.

[0068] The application will be further described in connection with the accompanying drawings Figure 22a and 2b show the schematic structural diagrams of the slurry suction system of the present invention in the open and closed mold states. The extrusion system consists of an extrusion die 8, a pressurized cavity 9, an elastomeric air bag 10, a slurry suction die 11, and a wet embryo 7 after slurry suction. The pressurized cavity 9 is arranged in the extrusion die 8 and is connected to the elastomeric air bag 10. The extrusion die 8 is arranged above the slurry suction die 11 and forms a bottle cavity with the slurry suction die 11. The wet embryo 7 after slurry suction is placed in the bottle cavity. The elastomeric air bag 10 extends into the wet embryo placed in the bottle cavity. After the mold is closed, the elastomeric air bag 10 is pressurized and expanded to squeeze the wet embryo onto the inner wall of the bottle cavity to form a preformed paper bottle 81. The elastomeric air bag 10 is a retractable elastomer that is pressurized and formed into a mold by inflation. After the molding is completed, the gas is discharged and the elastomeric air bag 10 is taken out. Through the "mold closing" state, the elastomer is pressurized to preform the wet embryo 7 that has absorbed the slurry, and the pressure of the elastomer air bag 10 is controlled to be 1 kgf, so that the moisture content of the preformed paper bottle is 40%~50% and the thickness is 1.5mm.

[0069] according to Figure 3 a and 3b show the structural schematic diagrams of the hot pressing forming system of the present invention in the open and closed states. The hot pressing upper mold 12 is composed of an elastomer resistant to high temperature and high pressure through an elastomer air bag 10, and the hot pressing lower mold 13 is composed of two mold bottle parts 92 and bottle bottom parts 93. The hot pressing forming system consists of a hot pressing upper mold 12, a pressurized cavity 91, an elastomer air bag 10, a hot pressing lower mold 13 and a preformed paper bottle 81. The pressurized cavity 91 is arranged in the hot pressing upper mold 12 and is connected to the elastomer air bag 10. The hot pressing upper mold 12 is arranged above the hot pressing lower mold 13 and forms a bottle cavity with the hot pressing lower mold 13. The preformed paper bottle 81 is placed in the bottle cavity, and the elastomer air bag 10 extends into the preformed paper bottle placed in the bottle cavity. The hot pressing upper mold 12 and the hot pressing lower mold 13 are provided with exhaust grooves. After the mold is closed, the hot pressing upper mold 12 is inflated and the elastic body is deformed to form an overall paper-plastic bottle 15 as a whole through the deformation of the elastomer. The hot pressing mold is heated to 150°C, and the elastomer air bag 10 is pressurized at about 5 kgf. Excess moisture is discharged through the exhaust groove, so that the moisture content of the finished overall paper-plastic bottle 15 is 3%-5% and the thickness is about 1.0 mm. After the molding is completed, the gas is discharged and the elastomer air bag 10 is taken out. Example

[0070] According to the attached Figure 1Fig. 1a and 1b show the structure of the injection molding system of the present application in open and closed mold state. The parts marked 1-5 are the mold structure design of the injection molding system. The injection molding system comprises an injection mold 1, an injection cavity 2 and a suction mold 4. The suction mold 4 has a concave cavity consistent with the shape of the bottle. The injection mold 1 is located above the concave cavity. The injection mold 1 and the suction mold 4 form a bottle cavity. The suction mold 4 is composed of suction mold halves. The injection mold 1 is connected to the injection cavity 2. The injection cavity has an extension 21. The extension 21 has an injection tube hole 3. The extension 21 extends into the concave cavity of the suction mold 4. The injection tube hole 3 is used to inject pulp to form a wet bottle embryo 7. The suction mold has suction holes 5 and a suction cavity 6. The suction holes 5 are located on the surface of the concave cavity and connected to the suction cavity 6. The suction holes 5 on the surface of the concave cavity correspond to the mouth, neck, body and bottom of the bottle cavity. The density of the suction holes on the mouth, neck and body is greater than that on the bottom. The suction cavity 6 is connected to a vacuum device (not shown). In the closed mold state, the injection cavity 2 and the extension 21 are used to inject pulp into the bottle cavity. The pulp is bamboo pulp. The bamboo pulp is injected into the corresponding parts of the bottle cavity under pressure to ensure that the pulp in the bottle cavity is sufficient and uniform. The vacuum device (not shown) is started to create a vacuum in the suction cavity 6 to uniformly adsorb the pulp on the surface of the suction mold to form a wet embryo 7 after suction. The vacuum is controlled by an electromagnetic valve and a pressure gauge to about 0.7 MPa. The moisture content of the wet embryo is controlled at about 70% to 80% with a thickness of about 2.5 mm.

[0071] According to Figure 2 Fig. 2a and 2b show the structure of the suction system of the present application in open and closed mold state. The extrusion system is composed of an extrusion mold 8, a pressurized cavity 9, an elastomer air bag 10, a suction mold 11 and a wet embryo 7 after suction. The pressurized cavity 9 is located in the extrusion mold 8 and connected to the elastomer air bag 10. The extrusion mold 8 is located above the suction mold 11 and forms a bottle cavity with the suction mold 11. The wet embryo 7 after suction is placed in the bottle cavity. The elastomer air bag 10 extends into the wet embryo placed in the bottle cavity. After the mold is closed, the elastomer air bag 10 is pressurized and expanded to extrude the wet embryo and adhere to the inner wall of the bottle cavity to form a preformed paper bottle 81. The elastomer air bag 10 is a stretchable elastomer that is pressurized to pressurize the mold. After the molding is completed, the gas is discharged and the elastomer air bag 10 is removed. In the "closed mold" state, the elastomer is pressurized to preform the wet embryo 7 after suction. The pressure of the elastomer air bag 10 is controlled at 1 kgf to control the moisture content of the preformed paper bottle at 40% to 50% with a thickness of 1.5 mm.

[0072] According to Figure 3Fig. a and 3b show the structure of the hot-pressing system of the present application in the open and closed mold state. The hot-pressing upper mold 12 is composed of the high-temperature and high-pressure resistant elastomer of the elastomer air bag 10, and the hot-pressing lower mold 13 is composed of two mold bottle body parts 92 and bottle bottom parts 93. The hot-pressing system is composed of the hot-pressing upper mold 12, the pressurized cavity 91, the elastomer air bag 10, the hot-pressing lower mold 13 and the preformed paper bottle 81. The pressurized cavity 91 is arranged in the hot-pressing upper mold 12 and connected to the elastomer air bag 10. The hot-pressing upper mold 12 is arranged above the hot-pressing lower mold 13 and forms a bottle cavity with the hot-pressing lower mold 13. The preformed paper bottle 81 is placed in the bottle cavity. The elastomer air bag 10 extends into the preformed paper bottle placed in the bottle cavity. The hot-pressing upper mold 12 and the hot-pressing lower mold 13 are made of air-permeable steel and have micropores with a diameter of 0.1-0.01 mm. After the mold is closed, the hot-pressing upper mold 12 is inflated to deform the elastomer and form the whole paper bottle 15. The mold is heated to 150°C. The pressurized elastomer air bag 10 has a pressure of about 5 kgf. The excess water is discharged through the micropores of the air-permeable steel. The water content of the finished product, the whole paper bottle 15, is about 3%-5%, and the thickness is about 1.0 mm. After the molding is completed, the gas is discharged, and the elastomer air bag 10 is removed. Example

[0073] According to the accompanying Figure 1Fig. 1a and 1b show the structure of the injection molding system of the present application in open and closed mold states. The parts marked 1-5 are the mold structure design of the injection molding system. The injection molding system comprises an injection mold plate 1, an injection cavity 2 and a suction mold plate 4. The suction mold plate 4 has a concave cavity consistent with the shape of the bottle. The injection mold plate 1 is located above the concave cavity and is connected to the bottle stirring suction device (not shown). The injection mold plate 1 and the suction mold plate 4 form a bottle cavity. The suction mold plate 4 is composed of a suction mold half plate. The injection mold plate 1 is connected to the injection cavity 2. The injection cavity has an extension 21 with an injection tube hole 3. The extension 21 extends into the concave cavity of the suction mold plate 4. The injection tube hole 3 is used to inject pulp to initially form a wet bottle embryo 7. The suction mold plate has a suction hole 5 and a suction cavity 6. The suction hole 5 is located on the surface of the concave cavity and is connected to the suction cavity 6. The suction hole 5 on the surface of the concave cavity corresponds to the bottle mouth, neck, body and bottom of the bottle cavity. The density of the suction holes in the bottle mouth, neck and body is greater than that in the bottom. The suction cavity 6 is connected to a vacuum device (not shown). In the closed mold state, the injection cavity 2 and the injection tube hole 3 of the extension 21 are used to spray pulp to the parts of the bottle cavity. The pulp is wood pulp. The wood pulp is uniformly dispersed by the bottle stirring suction device, so that the pulp sprayed into the bottle cavity is sufficient and uniform. The vacuum device (not shown) is started to create a vacuum in the suction cavity 6 to uniformly adsorb the paper pulp on the surface of the suction mold to form a wet embryo 7 after suction. The vacuum is controlled by a solenoid valve and a pressure gauge to about 0.7 MPa. The moisture content of the wet embryo is controlled at about 70% to 80% with a thickness of about 2.5 mm.

[0074] According to Figure 2 Fig. 2a and 2b show the structure of the suction system of the present application in open and closed mold states. The extrusion system is composed of an extrusion mold 8, a pressurized cavity 9, an elastomer air bag 10, a suction mold 11 and a wet embryo 7 after suction. The pressurized cavity 9 is located in the extrusion mold 8 and is connected to the elastomer air bag 10. The extrusion mold 8 is located above the suction mold 11 and forms a bottle cavity with the suction mold 11. The wet embryo 7 after suction is placed in the bottle cavity. The elastomer air bag 10 extends into the wet embryo placed in the bottle cavity. After the mold is closed, the elastomer air bag 10 is pressurized and expanded to extrude the wet embryo and adhere to the inner wall of the bottle cavity to form a preformed paper bottle 81. The elastomer air bag 10 is a stretchable elastomer that is pressurized by water to pressurize the mold for forming. After the forming is completed, the water is drained and the elastomer air bag 10 is removed. In the "closed mold" state, the elastomer is pressurized to preform the wet embryo 7 after suction. The pressure of the elastomer air bag 10 is controlled at 1 kgf to control the moisture content of the preformed paper bottle at 40% to 50% with a thickness of 1.5 mm.

[0075] According to Figure 3Fig. 3a and 3b show the structure of the hot-pressing system of the present application in the open and closed mold state. The hot-pressing upper mold 12 is composed of a high-temperature and high-pressure resistant elastomer of the elastomer air bag 10. The hot-pressing lower mold 13 is composed of two mold bottle body parts 92 and bottle bottom parts 93. The hot-pressing system is composed of the hot-pressing upper mold 12, the pressurized cavity 91, the elastomer air bag 10, the hot-pressing lower mold 13, and the preformed paper bottle 81. The pressurized cavity 91 is arranged in the hot-pressing upper mold 12 and connected to the elastomer air bag 10. The hot-pressing upper mold 12 is arranged above the hot-pressing lower mold 13 and forms a bottle cavity with the hot-pressing lower mold 13. The preformed paper bottle 81 is placed in the bottle cavity. The elastomer air bag 10 extends into the preformed paper bottle placed in the bottle cavity. The hot-pressing upper mold 12 and the hot-pressing lower mold 13 are provided with exhaust grooves. After the mold is closed, the hot-pressing upper mold 12 is inflated to deform the elastomer to form the overall paper-plastic bottle 15. The mold is heated to 150°C. The pressurization of the elastomer air bag 10 is about 5 kgf. The water content of the finished product, the overall paper-plastic bottle 15, is about 3%-5%. The thickness is about 1.0 mm. After the molding is completed, the water is discharged and the elastomer air bag 10 is removed. Embodiment

[0076] The pulp suction system comprises a pulp injection mold plate 1, a pulp injection cavity 2, and a pulp suction mold plate 4. The pulp suction mold plate 4 has a concave cavity consistent with the shape of the bottle. The pulp injection mold plate 1 is arranged above the concave cavity. The pulp injection mold plate 1 and the pulp suction mold plate 4 form a bottle cavity. The pulp suction mold plate 4 is composed of a pulp suction half mold plate. The pulp injection mold plate 1 is connected to the pulp injection cavity 2. The pulp injection cavity is used to preliminarily form a wet bottle embryo 7 by the method of pulp spinning on a roller. The pulp suction mold plate is provided with pulp suction holes 5 and a pulp suction cavity 6. The pulp suction holes 5 are arranged on the surface of the concave cavity and connected to the pulp suction cavity 6. The pulp suction holes 5 on the surface of the concave cavity correspond to the bottle mouth, the bottle neck, the bottle body, and the bottle bottom of the bottle cavity, respectively. The density of the pulp suction holes in the bottle mouth, the bottle neck, and the bottle body is greater than that in the bottle bottom. The pulp suction cavity 6 is connected to a vacuum device (not shown). In the closed mold state, pulp is sprayed to the parts of the bottle cavity through the pulp injection cavity 2. The pulp is sugarcane pulp. The pulp in the bottle cavity is sufficient and uniform. The vacuum device (not shown) is started to form a wet embryo 7 after suction by uniformly adsorbing the paper pulp on the surface of the pulp suction mold through the pulp suction cavity 6. The vacuum degree is controlled to be about 0.7 MPa by an electromagnetic valve and a pressure gauge. The water content of the wet embryo is controlled to be about 70%-80% with a thickness of about 2.5 mm.

[0077] According to Figure 22a and 2b show the schematic structural diagrams of the slurry suction system of the present invention in the open and closed mold states. The extrusion system consists of an extrusion die 8, a pressurized cavity 9, an elastomeric air bag 10, a slurry suction die 11, and a wet embryo 7 after slurry suction. The pressurized cavity 9 is arranged in the extrusion die 8 and is connected to the elastomeric air bag 10. The extrusion die 8 is arranged above the slurry suction die 11 and forms a bottle cavity with the slurry suction die 11. The wet embryo 7 after slurry suction is placed in the bottle cavity. The elastomeric air bag 10 extends into the wet embryo placed in the bottle cavity. After the mold is closed, the elastomeric air bag 10 is pressurized and expanded to squeeze the wet embryo onto the inner wall of the bottle cavity to form a preformed paper bottle 81. The elastomeric air bag 10 is a retractable elastomer that is pressurized and formed by filling the mold with oil. After the molding is completed, the oil is discharged and the elastomeric air bag 10 is taken out. Through the "mold closing" state, the elastomer is pressurized to preform the wet embryo 7 that has absorbed the slurry, and the pressure of the elastomer air bag 10 is controlled to be 1 kgf, so that the moisture content of the preformed paper bottle is 40%~50% and the thickness is 1.5mm.

[0078] according to Figure 3 a and 3b show the structural schematic diagrams of the hot pressing forming system of the present invention in the open and closed states. The hot pressing upper mold 12 is composed of an elastomer resistant to high temperature and high pressure through an elastomer air bag 10, and the hot pressing lower mold 13 is composed of two mold bottle parts 92 and bottle bottom parts 93. The hot pressing forming system consists of a hot pressing upper mold 12, a pressurized cavity 91, an elastomer air bag 10, a hot pressing lower mold 13 and a preformed paper bottle 81. The pressurized cavity 91 is arranged in the hot pressing upper mold 12 and is connected to the elastomer air bag 10. The hot pressing upper mold 12 is arranged above the hot pressing lower mold 13 and forms a bottle cavity with the hot pressing lower mold 13. The preformed paper bottle 81 is placed in the bottle cavity, and the elastomer air bag 10 extends into the preformed paper bottle placed in the bottle cavity. After the mold is closed, the hot pressing upper mold 12 is filled with oil pressure to deform the elastomer to form an overall paper-plastic bottle 15 for the paper bottle. The hot pressing mold is heated to 150°C, the elastomer air bag 10 is pressurized at about 5 kgf, and excess water is discharged, so that the moisture content of the finished overall paper-plastic bottle 15 is 3%-5% and the thickness is about 1.0 mm. After the molding is completed, the oil is discharged and the elastomer air bag 10 is taken out. Example

[0079] This embodiment is an embodiment of the present invention in which the paper-plastic bottle shell and the plastic liner are combined to produce an integral bottle.

[0080] like Figure 4 This equipment is divided into a paper bottle shell forming area 51, a paper bottle shell cutting area 52, a plastic bottle preform area 54, and a liner loading area 53. The paper bottle shell area is divided into a slurry absorption area and a hot pressing area. The slurry absorption area forms the wet bottle preform, which is then formed into the complete paper bottle shell in the hot pressing area. Paper bottles cut to a uniform standard size in the cutting area are then combined with the plastic liner in the liner loading area to form a complete paper bottle.

[0081] The paper bottle shell forming area is divided into two pulp suction modes:

[0082] Pulp suction mode one: the device is provided with two pulp suction molds, initially, the pulp suction mold B 42 is in the pulp pool, during work, the pulp suction mold A 41 moves downward to combine with the pulp suction mold B 42 into an integrated pulp suction mold, and the vacuum is opened to suck the pulp. After the internal paper bottle wet blank is formed, the integrated pulp suction mold moves upward to above the pulp pool horizontal surface, the vacuum of the pulp suction mold B 42 is closed, the vacuum of the pulp suction mold A 41 is continuously opened, then the two pulp suction molds are separated, the pulp suction mold B 42 moves downward to the initial position, and the paper bottle wet blank 7 is on the pulp suction mold A 41. As shown in Figure 5 , the hot-pressing lower mold 13 moves along the slide rail to the pulp suction mold, changes from the vertical direction to the horizontal direction, the pulp suction mold A 41 moves downward to contact the hot-pressing lower mold 13, the vacuum of the pulp suction mold A 41 is closed, the vacuum of the hot-pressing lower mold 13 is opened, the paper bottle wet blank 7 is transferred to the hot-pressing lower mold 13, and then the hot-pressing lower mold 13 returns to the original position to contact the hot-pressing upper mold 12 along the slide rail. As shown in Figure 8 , the extrusion mold moves downward, the elastic member 16 is loaded into the bottle, the extrusion mold has a high-temperature liquid and a pressurizing cavity, the high-temperature liquid is pressurized to fill into the elastic member, the elastic member is expanded and stretched to become larger, so that the paper bottle wet blank is tightly fitted in the hot-pressing mold inner cavity to be shaped, the high temperature of the elastic member and the high temperature of the hot-pressing mold make the paper bottle dry. When the water content of the paper bottle reaches the standard, the pressurizing cavity of the extrusion mold stops pressurizing, the high-temperature liquid flows back, the elastic member is reduced, the extrusion mold is lifted upward to leave the hot-pressing mold to return to the original position. As shown in Figure 9 , the hot-pressing upper mold 12 is opened, is separated from the hot-pressing lower mold 13, moves along the slide rail to the roller, changes from the vertical direction to the horizontal direction, moves to the roller 17, the tooth-shaped structure 17a of the roller 17 extends into the paper bottle 81 by a certain distance, the roller 17 drives the bottle to rotate, and the bottle is brought to the conveying belt, the hot-pressing upper mold 12 returns to the original position along the slide rail, and continues to combine with the hot-pressing lower mold 13 to produce.

[0083] Pulp suction mode two: as shown in Figure 6 , two pulp suction molds are provided, initially, the two pulp suction molds are combined and located above the pulp pool, after work starts, the integrated pulp suction mold moves downward until it is immersed in the pulp pool, the two pulp suction molds are opened, and the wet blank is formed. As shown in Figure 7 , the two pulp suction molds move upward, stop after reaching the specified position, the pulp suction mold A 41 stops vacuum pumping, the pulp suction mold B 42 continuously opens the vacuum, the pulp suction mold B 42 rotates counterclockwise by 45°, and the two pulp suction molds are separated. The pulp suction mold B 42 moves downward along the 45° direction until the tooth-shaped structure 104a of the roller 104 extends into the wet blank 7, the vacuum of the pulp suction mold B 42 is closed, and the original position is restored to continue the next production.

[0084] Paper bottle cutting part:

[0085] As shown in Figure 10The paper bottle product sent to the conveying belt in the forming process is gripped by the mechanical hands 105 arranged in a ring one by one, the mechanical hands 105 are rotated to the cutting member 19 and cut to a uniform height. The cut paper bottle shell is placed on the next conveying belt by the mechanical hands 105.

[0086] The liner assembly part:

[0087] As Figure 11 The cut paper bottle 81 is sent to the liner assembly process through the conveying belt, a certain number of paper bottles reach the designated position, and then the two side blow molding molds 101 are combined towards the paper bottle 81, so that the paper bottle 81 is placed in the blow molding mold 101; the preformed plastic bottle embryo 103 is preheated and moved to the blow molding mold through the corresponding track, and then is gripped by the blow molding head 102 and inserted into the paper bottle to the bottle embryo positioning position to collide with the paper bottle to perform blow molding. The processed paper bottle product is collected and stored.

[0088] The following table is the performance test result of the plastic liner whole bottle prepared in Example 5 of the present application.

[0089]

[0090] The paper bottle structure prepared adopts a 100% paper plastic product as the strength support of the shell, and a 0.1mm-0.05mm thick plastic as the liner to protect the liquid and achieve safety (food safety, daily chemical product field, etc.) and solve the problem of paper penetration to liquid, and reduce more than 70% of the plastic.

[0091] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mold for a paper-plastic integral bottle, comprising a slurry suction system, an extrusion system, and a hot press forming system; the slurry suction system is used to initially form a wet bottle blank by slurry injection, and to form the initially formed wet bottle blank into a wet blank after slurry suction by vacuuming; the extrusion system is used to extrude a preformed paper bottle through an elastomeric air bag; and the hot press forming system is used to extrude a monolithic paper bottle through the elastomeric air bag; the slurry suction system comprises a slurry injection template, a slurry injection cavity, and a slurry suction template; the slurry suction template has a concave cavity consistent with the shape of the bottle, and the slurry injection template is located above the concave cavity and connected to the slurry injection cavity; The extrusion system comprises an extrusion die, a pressurized cavity, an elastic air bag, a slurry suction die, and a wet preform after slurry suction. The pressurized cavity is arranged in the extrusion die and connected to the elastic air bag. The extrusion die is arranged above the slurry suction die and forms a bottle cavity with the slurry suction die. The wet preform after slurry suction is placed in the bottle cavity. The elastic air bag extends into the wet preform placed in the bottle cavity. After the die is closed, the elastic air bag is pressurized and expanded to squeeze the wet preform onto the inner wall of the bottle cavity to form a preformed paper bottle. The hot pressing forming system comprises a hot pressing upper die, a pressurizing cavity, an elastic air bag, a hot pressing lower die and a preformed paper bottle; the pressurizing cavity is arranged in the hot pressing upper die and connected to the elastic air bag; the hot pressing upper die is arranged above the hot pressing lower die and forms a bottle cavity with the hot pressing lower die; the preformed paper bottle is placed in the bottle cavity; the elastic air bag extends into the preformed paper bottle placed in the bottle cavity; after the die is closed, the elastic air bag is pressurized and expanded to squeeze the preformed paper bottle onto the inner wall of the bottle cavity to form a whole paper bottle; Its characteristics are: The grouting cavity has an extension part, and grouting pipe holes are evenly arranged on the extension part. The extension part extends into the bottom of the concave cavity of the slurry absorption template, and grouting is performed through the grouting pipe holes to initially form a wet bottle embryo; the grouting is spraying or roller throwing.

2. The mold according to claim 1, characterized in that: The grouting template and the slurry absorption template form a bottle cavity, and the slurry absorption template is composed of a slurry absorption half template; the extrusion system is composed of an extrusion die, a pressurized cavity, an elastic air bag, a slurry absorption die and a wet embryo after slurry absorption.

3. The mold according to claim 2, characterized in that: The pressurized cavity is arranged in the extrusion die and is connected to the elastic air bag. The extrusion die is arranged above the slurry absorption die and forms a bottle cavity with the slurry absorption die. The wet preform after slurry absorption is placed in the bottle cavity, and the elastic air bag extends into the wet preform placed in the bottle cavity. After the die is closed, the elastic air bag is pressurized and expanded to squeeze the wet preform to stick to the inner wall of the bottle cavity to form a preformed paper bottle.

4. The mold according to claim 3, characterized in that: The elastic air bag is pressurized by high-pressure gas, water pressure or oil pressure to increase the pressure in the inner cavity of the wet embryo after absorbing the slurry, thereby playing the role of drainage and pre-forming.

5. The mold according to claim 1, characterized in that: The pressurized cavity is arranged in the hot pressing upper mold and is connected to the elastic air bag. The hot pressing upper mold is arranged above the hot pressing lower mold and forms a bottle cavity with the hot pressing lower mold. The preformed paper bottle is placed in the bottle cavity, and the elastic air bag extends into the preformed paper bottle placed in the bottle cavity. After the mold is closed, the elastic air bag is pressurized and expanded to squeeze the preformed paper bottle to stick to the inner wall of the bottle cavity to form an integral paper bottle.

6. A process for producing a paper-plastic integral bottle, using the mold according to any one of claims 1 to 5, comprising the following steps: (1) Assemble the slurry suction system and put it in the mold closing state, and inject slurry into the bottle cavity through the slurry injection holes of the slurry injection cavity and the extension part to ensure that the slurry in the bottle cavity is sufficient and uniform; (2) The vacuum equipment is started, and the vacuum is drawn through the slurry suction cavity to allow the pulp to be evenly adsorbed on the surface of the slurry suction mold to form a wet embryo after slurry suction; (3) The wet embryo after absorbing slurry is transferred to the extrusion system, and the wet embryo after absorbing slurry is placed in the bottle cavity. The elastic air bag extends into the wet embryo placed in the bottle cavity. After the mold is closed, the elastic air bag is pressurized and expanded to squeeze the wet embryo onto the inner wall of the bottle cavity to form a preformed paper bottle; (4) The preformed paper bottle is transferred to the hot pressing molding system, the preformed paper bottle is placed in the bottle cavity, and the elastic air bag extends into the preformed paper bottle placed in the bottle cavity. After the mold is closed, the elastic air bag is pressurized and expanded to squeeze the preformed paper bottle onto the inner wall of the bottle cavity, and hot pressing is performed to form a whole paper bottle.

7. The process according to claim 6, characterized in that: In step (1), the grouting is performed by spraying or roller slurrying; the slurry is sugarcane slurry, bamboo slurry or wood slurry; and steps (3) and (4) further comprise the steps of discharging the pressurized gas or liquid and removing the elastomeric air bag.

8. A production equipment for paper bottles with plastic liner, comprising a paper bottle forming area, a paper bottle shell cutting area, a plastic bottle blank area and a liner loading area; characterized in that: The paper bottle shell forming area comprises the mold of the paper-plastic integral bottle according to any one of claims 1 to 5, and forms the integral paper bottle shell after molding; The plastic bottle preform area forms a bottle preform with a plastic liner; In the liner loading area, the paper-plastic integral bottle shell is placed in the blow molding mold. When the blow molding head puts the plastic bottle blank into the blow molding mold for blow molding, the plastic liner is directly attached to the paper bottle shell.

9. A production process for a plastic liner paper bottle, comprising the following steps: The paper-plastic integral bottle shell is prepared according to the process of claim 7; the plastic bottle blank is prefabricated in the plastic bottle blank area; in the liner loading area, the paper-plastic integral bottle is placed in the blow molding mold, and when the blow molding head puts the plastic bottle blank into the blow molding mold for blow molding, it is directly attached to the paper bottle shell.

Images