CN109228080B - A two board-like moulds that is used for compound sheet of multilayer polymer's cast moulding - Google Patents
A two board-like moulds that is used for compound sheet of multilayer polymer's cast moulding Download PDFInfo
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- CN109228080B CN109228080B CN201811325903.1A CN201811325903A CN109228080B CN 109228080 B CN109228080 B CN 109228080B CN 201811325903 A CN201811325903 A CN 201811325903A CN 109228080 B CN109228080 B CN 109228080B
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- template
- cavity
- rear baffle
- lower template
- polyurethane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
Abstract
The invention provides a two-plate type mold for casting molding of a multilayer polymer composite sheet, belonging to the technical field of polymer molding. The die comprises an upper die plate, a lower die plate, a rear baffle plate, a bolt fastener and a positioning screw. The upper template and the lower template are connected through a bolt fastener, the rear baffle is placed in a limiting groove at one side of the upper template and the lower template for primary positioning, and then the rear baffle is positioned by using a positioning screw. The invention mainly aims at the defects of complex production process, low production efficiency, need of using a binder for multiple bonding and compounding and the like of the prior molding technology of the multilayer polymer composite sheet, and provides a two-plate mold for casting molding of the multilayer polymer composite sheet.
Description
Technical Field
The invention belongs to the technical field of polymer molding, and relates to a polymer casting molding mold, in particular to a two-plate mold for casting molding of a multilayer polymer composite sheet.
Background
The multilayer polymer composite sheet is formed by laminating and compounding films, fabrics or sheets with various functions into a whole, so that the multilayer composite material with high strength and high flexibility is formed, and unique properties such as gas barrier, aging resistance, wave absorption, heat preservation and the like are endowed to the product. Because the multilayer high molecular composite sheet has a plurality of excellent performances, the multilayer high molecular composite sheet is widely applied to the fields of national defense, civil use and the like which have special performance requirements on products. In the aspect of forming of multilayer high molecular composite sheets, the existing forming technical means mainly comprises the steps of independently forming the multilayer high molecular sheets respectively, and then bonding and compounding the independently formed multilayer sheets for multiple times by using a bonding agent. Therefore, a simple and efficient method for casting and molding a multilayer polymer composite sheet is needed to solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a two-plate mold for casting molding of a multilayer polymer composite sheet, which has a simple structure, and can realize the composite casting molding of up to five layers of polymer sheets by combining the upper surface or the lower surface of an upper template and the upper surface and the lower surface of a lower template in different forms under the condition of carrying out multiple bonding and compounding without using any bonding agent.
The technical scheme of the invention is as follows:
a two-plate mold for casting molding of a multilayer polymer composite sheet comprises an upper template 1, a lower template 2, a rear baffle 5, a bolt fastener 3 and a positioning screw 4, wherein grooves are respectively arranged on the lower surface of the upper template 1 and the upper surface of the lower template 2, and are combined to form a molding cavity of the sheet, so that the length of the groove is ensured to be greater than that of the sheet, and the increase of the product reject ratio caused by the fact that the cavity is not filled fully is avoided; one side of the upper template 1 and one side of the lower template 2 are provided with pouring ports in a semi-horn shape, and the pouring ports are used for discharging bubbles generated in the curing process of the high polymer material and observing the rising height of the liquid level in the cavity; the other sides of the upper template 1 and the lower template 2 are provided with limiting grooves, and the limiting grooves and the positioning screws 4 are used for positioning the rear baffle 5; the rear baffle 5 is provided with two through holes for discharging the redundant polymer slurry at the bottom, so that the whole cavity is filled with the polymer material, and the upper template 1 and the lower template 2 are connected through the bolt fastener 3.
The upper surface or the lower surface of the upper template 1 and the upper surface or the lower surface of the lower template 2 are oppositely arranged and combined to form a molding cavity of the sheet, so that mold cavities with different thicknesses are formed, and the casting molding of the polymer sheets with different thicknesses is realized.
The formed sheet is fixed between the upper template 1 and the lower template 2 through a bolt fastener 3, and the composite forming of the multilayer sheet is realized by utilizing a cavity between the sheet and the inner surface of the die cavity through a casting forming method.
The invention has the beneficial effects that: the invention adopts a two-plate type casting mould with simple structure to cast and mold the multilayer polymer composite sheet, can realize the composite casting and molding of five layers of polymer sheets under the condition of not using any binder to carry out multiple composite bonding, greatly simplifies the production process, improves the production efficiency, and simultaneously effectively eliminates the defect that the intermediate bonding layer influences the product performance.
Drawings
Fig. 1 is a schematic front view of a first two-plate mold assembly of the present invention.
FIG. 2 is a schematic rear view of a first two-plate mold assembly of the present invention.
Fig. 3 is a schematic front view of a second assembly form of the two-plate mold according to the present invention.
In the figure: 1, mounting a template; 2, a lower template; 3, a bolt fastener; 4, positioning a screw; 5 a rear baffle.
Detailed Description
The following describes in detail the preferred embodiments of the present invention with reference to the drawings.
The embodiment is used for casting molding of a four-layer polyurethane and polyimide composite sheet material, and the specific structure of the four-layer composite sheet material comprises upper-layer polyurethane, inner-layer polyimide, lower-layer polyurethane and back-plate-layer polyimide. The invention designs a two-plate type mould for casting and molding a multilayer polymer composite sheet, aiming at realizing the composite casting and molding of a four-layer sheet under the condition of carrying out multiple times of bonding and compounding without using any bonding agent.
The steps of the example are as follows:
step 1: as shown in fig. 1, prior to assembly of the mold, an appropriate amount of mold release agent is applied to the relevant surfaces of the cavity portion. The lower surface of attaching inlayer polyimide film in lower bolster 2 makes up the lower surface of cope match-plate pattern 1 and the lower surface of lower bolster 2, connects cope match-plate pattern 1 and lower bolster 2 through bolt fastening piece 3, places backplate 5 in the spacing groove department of cope match-plate pattern 1 and lower bolster 2 one side and carries out the primary importance, reuses set screw 4 and fixes a position backplate 5, constitutes from this and treats the casting die.
Step 2: and preheating the assembled assembly form die to reach the specified die temperature.
And step 3: polyurethane slurry is slowly injected from a pouring gate on one side, and the rear baffle 5 is provided with a through hole, so that the excessive polyurethane slurry at the bottom can be discharged, and the polyurethane slurry can be filled in the whole cavity.
And 4, step 4: and (3) placing the poured mould in an incubator for curing, and demolding the cured and molded two layers of composite sheets after curing for a period of time.
And 5: as shown in fig. 3, prior to assembly of the mold, an appropriate amount of mold release agent is applied to the relevant surfaces of the cavity portion. Attaching in the upper surface of lower bolster 2 with the back sheet layer polyimide film, make up the lower surface of cope match-plate pattern 1 and the upper surface of lower bolster 2, it is fixed between cope match-plate pattern 1 and lower bolster 2 through bolt fastener 3 with the two-layer composite sheet that the shaping is good simultaneously, place backplate 5 in the spacing groove department of cope match-plate pattern 1 and lower bolster 2 one side and carry out the primary importance, reuse set screw 4 to fix a position backplate 5, the die cavity of treating the casting die is constituteed to the cavity between sheet and the mould die cavity internal surface.
Step 6: and preheating the assembled two molds in the assembly form so as to achieve the specified mold temperature.
And 7: polyurethane slurry is slowly injected from a pouring gate on one side, and the rear baffle 5 is provided with a through hole, so that redundant polyurethane slurry at the bottom can be discharged, and the polyurethane can be filled in the whole cavity.
And 8: and (3) placing the poured mould in an incubator for curing, and demolding the cured four-layer composite sheet after curing for a period of time. Therefore, the casting molding of the four-layer polyurethane and polyimide composite sheet is realized under the condition of carrying out multiple times of composite bonding without using any bonding agent.
Claims (1)
1. The casting molding method for the multilayer polymer composite sheet is characterized in that the method is used for casting molding through two plate-type molds, the two plate-type molds comprise an upper template (1), a lower template (2), a rear baffle (5), a bolt fastener (3) and a positioning screw (4), grooves are respectively arranged on the lower surface of the upper template (1) and the upper surface of the lower template (2), and are combined to form a molding cavity of the sheet, so that the length of the groove is ensured to be greater than that of the sheet, and the phenomenon that the cavity is not filled fully to increase the reject ratio of products is avoided; one side of the upper template (1) and one side of the lower template (2) are provided with pouring ports in a semi-horn shape, and the pouring ports are used for discharging bubbles generated in the curing process of the high polymer material and observing the rising height of the liquid level in the cavity; the other sides of the upper template (1) and the lower template (2) are provided with limiting grooves, and the limiting grooves and the positioning screws (4) are used for positioning the rear baffle (5); the rear baffle (5) is provided with two through holes for discharging the redundant polymer slurry at the bottom, so that the whole cavity can be filled with the polymer material, and the upper template (1) and the lower template (2) are connected through the bolt fastener (3); the combination mode of the upper template (1) and the lower template (2) is changed, namely the upper surface or the lower surface of the upper template (1) and the upper surface and the lower surface of the lower template (2) are oppositely arranged to form a molding cavity of the sheet material in a combined mode, so that mold cavities with different thicknesses are formed, and the casting molding of the polymer sheet materials with different thicknesses is realized;
the multilayer polymer composite sheet sequentially comprises upper polyurethane, inner polyimide, lower polyurethane and back plate layer polyimide;
the casting molding method comprises the following steps:
the method comprises the following steps: before assembling the mould, coating a release agent on each relevant surface of the cavity part; attaching an inner polyimide film to the lower surface of a lower template (2), combining the lower surface of an upper template (1) with the lower surface of the lower template (2), connecting the upper template (1) with the lower template (2) through a bolt fastener (3), placing a rear baffle (5) at a limiting groove on one side of the upper template (1) and the lower template (2) for primary positioning, and positioning the rear baffle (5) by using a positioning screw (4) to form a mold to be cast;
step two: preheating the die assembled in the step one to reach the specified die temperature;
step three: polyurethane slurry is slowly injected from a pouring gate at one side, and the rear baffle (5) is provided with a through hole, so that the redundant polyurethane slurry at the bottom can be discharged, and the polyurethane can be favorably filled in the whole cavity;
step four: placing the poured mould in a heat preservation box for curing, and demolding the cured and molded two layers of composite sheets;
step five: before assembling the mould, coating a proper amount of mould release agent on each relevant surface of the cavity part; attaching a back plate layer polyimide film to the upper surface of a lower template (2), combining the lower surface of an upper template (1) with the upper surface of the lower template (2), fixing a formed two-layer composite sheet between the upper template (1) and the lower template (2) through a bolt fastener (3), placing a rear baffle (5) in a limiting groove at one side of the upper template (1) and the lower template (2) for primary positioning, positioning the rear baffle (5) by using a positioning screw (4), and forming a cavity of a mold to be poured by a cavity between the sheet and the inner surface of the cavity of the mold;
step six: preheating the die assembled in the fifth step to reach the specified die temperature;
step seven: polyurethane slurry is slowly injected from a pouring gate at one side, and the rear baffle (5) is provided with a through hole, so that redundant polyurethane slurry at the bottom can be discharged, and the polyurethane can be favorably filled in the whole cavity;
step eight: placing the poured mould in a heat preservation box for curing, and demolding the cured four-layer composite sheet; therefore, the casting molding of the four-layer polyurethane and polyimide composite sheet is realized under the condition of carrying out multiple times of composite bonding without using any bonding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811325903.1A CN109228080B (en) | 2018-11-08 | 2018-11-08 | A two board-like moulds that is used for compound sheet of multilayer polymer's cast moulding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811325903.1A CN109228080B (en) | 2018-11-08 | 2018-11-08 | A two board-like moulds that is used for compound sheet of multilayer polymer's cast moulding |
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| Publication Number | Publication Date |
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| CN109228080A CN109228080A (en) | 2019-01-18 |
| CN109228080B true CN109228080B (en) | 2020-08-25 |
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| CN201811325903.1A Active CN109228080B (en) | 2018-11-08 | 2018-11-08 | A two board-like moulds that is used for compound sheet of multilayer polymer's cast moulding |
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| CN113843115B (en) * | 2021-09-22 | 2022-09-23 | 浙江华帅特新材料科技有限公司 | Mold for substrate surface functionalization and substrate surface functionalization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5678953A (en) * | 1979-11-30 | 1981-06-29 | Matsushita Electric Works Ltd | Preparation of building panel |
| US4320157A (en) * | 1980-08-08 | 1982-03-16 | Hagens Gunther Von | Method for preserving large sections of biological tissue with polymers |
| JPS61143107A (en) * | 1984-12-17 | 1986-06-30 | Kokuren Sangyo Kk | Manufacture of foamed plate of polyvinyl chloride |
| JP2004268518A (en) * | 2003-03-11 | 2004-09-30 | Polymatech Co Ltd | Method for producing anisotropic molding, mold and thread substrate used in the method |
| CN201174378Y (en) * | 2007-10-29 | 2008-12-31 | 株洲南车时代电气股份有限公司 | Glue filling mould of semiconductor chip |
| CN203267036U (en) * | 2013-04-15 | 2013-11-06 | 维尔特机械（上海）有限公司 | Die for polyurethane pouring |
| CN205631187U (en) * | 2016-04-04 | 2016-10-12 | 洪俊彬 | Novel automatic ripples case mould of car |
| CN207481039U (en) * | 2017-10-10 | 2018-06-12 | 宣城市意心达科技有限公司 | A kind of electric vehicle PU takes turns mould emptier |
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