CN109228080B - A two-plate mold for casting multi-layer polymer composite sheet - Google Patents

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

A two-plate mold for casting multi-layer polymer composite sheet

technical field

The invention belongs to the technical field of polymer molding, and relates to a polymer casting mold, in particular to a two-plate mold used for the casting molding of multi-layer polymer composite sheets.

Background technique

Multi-layer polymer composite sheet is a multi-layer composite material that combines a variety of films, fabrics or sheets with different functions to form a multi-layer composite material with high strength and high flexibility, and at the same time endows the product with unique properties, such as barrier Gas, anti-aging, absorbing, heat preservation, etc. Due to the many excellent properties of multi-layer polymer composite sheets, they are currently widely used in the fields of national defense and civil applications that have special performance requirements for products. In the aspect of forming multi-layer polymer composite sheets, the existing forming technology means mainly to separately form the multi-layer polymer sheets respectively, and then use the adhesive to mold the separately formed multi-layer sheets for multiple times. Bonding and compounding, the production process of this molding technology is relatively complex, the production efficiency is low, and the intermediate bonding layer may have a certain degree of influence on the performance of the product. Therefore, it is necessary to design a simple and efficient multi-layer polymer composite sheet casting molding method to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a two-plate mold for the casting of multi-layer polymer composite sheets. In the case of bonding and compounding, the composite casting molding of up to five layers of polymer sheets can be realized by combining the upper or lower surface of the upper template with the upper and lower surfaces of the lower template in different forms.

Technical scheme of the present invention:

A two-plate mold for casting multi-layer polymer composite sheets, comprising an upper template 1, a lower template 2, a rear baffle 5, bolt fasteners 3 and positioning screws 4, the lower surface of the upper template 1 and The upper surface of the lower template 2 is respectively provided with grooves, which are combined to form the forming cavity of the sheet, to ensure that the length of the groove is greater than the length of the sheet, so as to prevent the cavity from being filled and increase the product defect rate; the upper template 1 and the lower template 2 There is a pouring port on one side of the mold, which is half-horn type, which is used to discharge the bubbles generated during the curing process of the polymer material, and at the same time, it is used to observe the rising height of the liquid level in the cavity; the other side of the upper template 1 and the lower template 2 is set The limit slot, the limit slot and the positioning screw 4 are used to locate the rear baffle 5; the rear baffle 5 is provided with two through holes for discharging the excess polymer slurry at the bottom, which is conducive to filling the entire cavity with polymer materials , the upper formwork 1 and the lower formwork 2 are connected by bolt fasteners 3.

The upper or lower surface of the upper template 1 and the upper and lower surfaces of the lower template 2 are arranged opposite to form the molding cavity of the sheet, forming mold cavities of different thicknesses, and realizing the casting molding of polymer sheets of different thicknesses.

The formed sheet is fixed between the upper template 1 and the lower template 2 by bolt fasteners 3, and the multi-layer sheet is realized by using the cavity between the sheet and the inner surface of the mold cavity by casting molding. composite molding.

The beneficial effects of the present invention are as follows: the present invention adopts a two-plate casting mold with a simple structure to cast the multi-layer polymer composite sheet, and can perform multiple composite bonding without using any binder. The composite casting molding of up to five layers of polymer sheets is realized, which greatly simplifies the production process, improves the production efficiency, and effectively eliminates the defect that the intermediate bonding layer affects the product performance.

Description of drawings

FIG. 1 is a schematic view of the front structure of the two-plate mold assembly form 1 of the present invention.

FIG. 2 is a schematic view of the rear view of the two-plate mold assembly form 1 of the present invention.

FIG. 3 is a schematic view of the front structure of the second assembly form of the two-plate mold according to the present invention.

In the picture: 1 upper formwork; 2 lower formwork; 3 bolt fasteners; 4 set screws; 5 tailgate.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the technical solutions and the accompanying drawings.

This example is used for the casting molding of a four-layer polyurethane and polyimide composite sheet. The specific structure of the four-layer composite sheet includes an upper layer of polyurethane, an inner layer of polyimide, a lower layer of polyurethane and a backing layer of polyimide. amine. In order to realize the composite casting molding of the four-layer sheet without using any adhesive for multiple bonding and compounding, the present invention designs a casting molding for the multi-layer polymer composite sheet. of two-plate molds.

The embodiment steps are as follows:

Step 1: As shown in Figure 1, before assembling the mold, apply an appropriate amount of release agent to the relevant surfaces of the cavity part. The inner polyimide film is attached to the lower surface of the lower template 2, the lower surface of the upper template 1 and the lower surface of the lower template 2 are combined, and the upper template 1 and the lower template 2 are assembled by bolt fasteners 3. To connect, place the rear baffle 5 in the limit grooves on the side of the upper template 1 and the lower template 2 for initial positioning, and then use the positioning screws 4 to position the rear baffle 5, thereby forming the mold to be poured.

Step 2: Preheat the assembled assembly form one mold to reach the specified mold temperature.

Step 3: The polyurethane slurry is slowly injected from the pouring port on one side, and the rear baffle 5 is provided with a through hole, which can discharge the excess polyurethane slurry at the bottom, which is conducive to filling the entire cavity with polyurethane.

Step 4: The mold after casting is placed in an incubator for curing, and after curing for a period of time, the two-layer composite sheet that has been cured and formed is demolded.

Step 5: As shown in Figure 3, before assembling the mold, apply an appropriate amount of release agent to the relevant surfaces of the cavity part. The polyimide film of the backing layer is attached to the upper surface of the lower template 2, the lower surface of the upper template 1 is combined with the upper surface of the lower template 2, and the formed two-layer composite sheet is fastened by bolts. Part 3 is fixed between the upper formwork 1 and the lower formwork 2, and the rear baffle 5 is placed in the limit grooves on the side of the upper formwork 1 and the lower formwork 2 for initial positioning, and then the positioning screws 4 are used to fix the rear baffle 5. Positioning, the cavity between the sheet and the inner surface of the mold cavity constitutes the cavity of the mold to be poured.

Step 6: Preheat the assembled assembly form two molds to reach the specified mold temperature.

Step 7: The polyurethane slurry is slowly injected from the pouring port on one side, and the rear baffle 5 is provided with a through hole, which can discharge the excess polyurethane slurry at the bottom, which is conducive to filling the entire cavity with polyurethane.

Step 8: The mold after the casting is placed in an incubator for curing, and after curing for a period of time, the cured and formed four-layer composite sheet is demolded. Thus, the casting molding of a four-layer polyurethane and polyimide material composite sheet is realized without using any adhesive for multiple composite bonding.

Claims (1)

1. a casting molding method for multi-layer polymer composite sheet, is characterized in that, this method is cast molding by two-plate mold, and described two-plate mold comprises upper template (1), lower template (2), The rear baffle (5), the bolt fastener (3) and the positioning screw (4), the lower surface of the upper template (1) and the upper surface of the lower template (2) are respectively provided with grooves, which are combined to form the molding of the sheet Make sure that the length of the groove is greater than the length of the sheet, so as to avoid the filling of the cavity and increase the defect rate of the product; one side of the upper template (1) and the lower template (2) are provided with pouring gates, which are semi-trumpet-shaped. It is used to discharge the air bubbles generated during the curing process of the polymer material, and at the same time, it is used to observe the rising height of the liquid level in the cavity; the other side of the upper template (1) and the lower template (2) are provided with limit slots, limit slots and positioning screws (4) It is used to position the rear baffle (5); the rear baffle (5) is provided with two through holes for discharging the excess polymer slurry at the bottom, which is beneficial to the polymer material filling the entire cavity, and the upper template ( 1) and the lower formwork (2) are connected by bolt fasteners (3); change the combination of the upper formwork (1) and the lower formwork (2), that is, the upper or lower surface of the upper formwork (1) and the lower formwork ( 2) The upper and lower surfaces are arranged relative to each other to form the molding cavity of the sheet, forming mold cavities of different thicknesses, and realizing the casting molding of polymer sheets of different thicknesses; The multi-layer polymer composite sheet sequentially comprises an upper layer of polyurethane, an inner layer of polyimide, a lower layer of polyurethane and a backing layer of polyimide; The casting molding method includes the following steps: Step 1: Before assembling the mold, apply release agent to the relevant surfaces of the cavity part; attach the inner polyimide film to the lower surface of the lower template (2), and attach the lower surface of the upper template (1) to the lower surface of the lower template (1). The lower surface of the lower formwork (2) is assembled, the upper formwork (1) and the lower formwork (2) are connected by bolt fasteners (3), and the rear baffle (5) is placed on the upper formwork (1) and the lower formwork (2). Preliminary positioning is performed at the limit groove on one side of the template (2), and then the rear baffle (5) is positioned with the positioning screw (4), thereby forming the mold to be poured; Step 2: Preheat the mold assembled in step 1 to reach the specified mold temperature; Step 3: The polyurethane slurry is slowly injected from the pouring port on one side, and the rear baffle (5) is provided with a through hole, which can discharge the excess polyurethane slurry at the bottom, which is conducive to filling the entire cavity with polyurethane; Step 4: placing the mold after the pouring is completed in an incubator for curing, and performing demoulding treatment on the cured and formed two-layer composite sheet; Step 5: Before assembling the mold, apply an appropriate amount of mold release agent to the relevant surfaces of the cavity part; attach the polyimide film of the backing layer to the upper surface of the lower template (2), and attach the lower surface of the upper template (1). The surface is combined with the upper surface of the lower template (2), and at the same time, the formed two-layer composite sheet is fixed between the upper template (1) and the lower template (2) by bolt fasteners (3), and the back The plate (5) is placed at the limit grooves on one side of the upper template (1) and the lower template (2) for initial positioning, and then the positioning screw (4) is used to position the rear baffle (5). The cavity between the inner surfaces of the cavity constitutes the cavity of the mold to be poured; Step 6: Preheat the mold assembled in step 5 to reach the specified mold temperature; Step 7: The polyurethane slurry is slowly injected from the pouring port on one side, and the rear baffle (5) is provided with a through hole, which can discharge the excess polyurethane slurry at the bottom, which is conducive to filling the entire cavity with polyurethane; Step 8: Place the poured mold in an incubator for curing, and perform demoulding treatment on the cured and formed four-layer composite sheet; thus, without using any adhesive for multiple composite bonding , to realize the casting molding of a four-layer polyurethane and polyimide material composite sheet.

Images