Composite material sealing cap forming device

Abstract

The invention discloses a composite material sealing cap forming device which comprises a heating table, a female die, a plurality of forming dies and a pressing table. The table top of the heating table is used for laying a base material; the female die is placed on the table top of the heating table, a plurality of die holes are formed in the female die, and a material sheet is placed in each die hole; one pressing end of each forming die penetrates into each die hole of the female die in a one-to-one correspondence manner; the pressing table makes contact with the other ends of the forming dies, the pressing ends of the forming dies press the material pieces in the corresponding die holes to the base material through the pressing table, and the heating table is used for heating so that the material pieces can be combined with the base material to form the sealing cap. Through a water-free heating mode, a hydrolysis reaction possibly occurring in a damp and hot environment of the material is avoided, the surface of a formed product is free of concave-convex marks, indentations or micropores caused by water, the product is flat and smooth, the appearance quality is remarkably improved, warping and cracking are not prone to occurring, accurate temperature control can be achieved, and the method has the advantages of being high in forming efficiency, short in production period and low in production cost. And the working environment is clean and safe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sealing cap forming device, in particular to a composite sealing cap forming device. BACKGROUND

[0002] The composite sealing cap is composed of a sheet and a cloth as a base material on the sheet, wherein the sheet is generally nitrocellulose sheet or celluloid sheet. The existing technology is to immerse the lower part of the sheet in hot water to soften, and then add cloth on the upper top surface of the softened sheet exposed to the water surface, so that the softened sheet is combined with the cloth to form a composite sealing cap. The composite sealing cap can be used as a sealing element of a shell cartridge to ensure that the medicament in the cartridge is in a stable environment and does not leak, get wet, and be contaminated.

[0003] However, the existing technology of hot water heating forming composite sealing cap has the following problems: 1. The material of the sheet (nitrocellulose sheet or celluloid sheet) has a certain hygroscopicity, and the water content of the sheet increases after soaking in hot water. If the pressed sealing cap is not completely dried, it will shrink and deform during future storage. At the same time, the moisture will also affect the smoothness and transparency of the surface of the sheet.

[0004] 2. The heat is conducted through water, and the center and edge of the sheet, as well as the parts in contact with water and not in contact with water, are unevenly heated, which will cause the internal stress of the final formed product to be huge, and the product will deform, warp, and even crack after cooling. SUMMARY

[0005] The present application provides a composite sealing cap forming device to solve the problems of shrinkage, warping, and cracking of the composite sealing cap formed by hot water heating in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the present application is as follows: The composite sealing cap forming device comprises a heating table (1), a concave die (2), a plurality of forming dies (3), and a pressing table (4). The surface of the heating table (1) is used to lay the base material. The concave die (2) is placed on the surface of the heating table (1) and presses the base material. The concave die (2) has a plurality of die holes (2.1) penetrating through the concave die (2). One end of each die hole (2.1) is provided with a hole opening on the side of the concave die (2) closely contacting the heating table (3), and the other end of each die hole (2.1) is provided with a hole opening on the side of the concave die (2) away from the heating table (3). The inside of each die hole (2.1) is used to place the sheet. The several forming dies (3) each have one end as a pressing end, and the pressing end of each forming die (3) is correspondingly inserted into each die hole (2.1) of the concave die (2); the pressing table (4) is in contact with the other end of each forming die (3), and force is applied to the other end of each forming die (3) through the pressing table (4), so that the pressing end of each forming die (3) presses the material sheet in the corresponding die hole (2.1) on the base material, and the material sheet in each die hole (2.1) of the concave die (2) is heated through the heating table (1), so that each material sheet is respectively compounded with the base material to form the sealing cap.

[0007] Further, each die hole (2.1) is a stepped hole composed of a small-diameter section and a large-diameter section; the orifice of the small-diameter section of each die hole (2.1) is arranged on the side of the concave die (2) close to the heating table (3), and the orifice of the large-diameter section of each die hole (2.1) is arranged on the side of the concave die (2) away from the heating table (3); the material sheet is placed in the small-diameter section of each die hole (2.1).

[0008] Further, the outer diameter of the pressing end of each forming die (3) matches the inner diameter of the small-diameter section of the die hole (2.1).

[0009] Further, the device further comprises several positioning dies (5), each of which has a central through hole, and the outer edge of one end of each positioning die (5) is formed with a ring table (5.1) whose outer diameter matches the inner diameter of the large-diameter section of the die hole (2.1); the ring table of one end of each positioning die (5) is correspondingly installed in the large-diameter section of each die hole (2.1) and abuts against the stepped part in the corresponding die hole (2.1). Each forming die (3) correspondingly penetrates the central through hole of the positioning die (5), and the pressing end of each forming die (3) presses the material sheet in the corresponding die hole (2.1) on the base material.

[0010] Further, a threaded section is formed on a section of each forming die (3) close to the other end, and a nut (6) is screw-coupled to the threaded section of each forming die (3). A spring (7) is arranged between the nut (6) installed on each forming die (3) and the ring table (5.1) of the positioning die (5) penetrated by the forming die (3), one end of the spring (7) is in contact with or connected to the nut (6), and the other end of the spring (7) is in contact with or connected to the ring table (5.1).

[0011] Further, the pressing table (4) is a heating plate, and when the heating plate is in contact with the other end of each forming die (3), the heat generated by the heating plate is conducted to the material sheet in the corresponding die hole (2.1) through each forming die (3).

[0012] Compared with the prior art, the device has the following beneficial effects: I. Improved product appearance and quality 1. True color, no risk of yellowing: Moisture and high temperature are two factors that cause the aging and yellowing of the sheet material (nitrocellulose film or celluloid film). In this invention, the heating table heats the sheet below each mold hole, and the heating plate forms a pressure table to conduct heat from above the sheet. This forms a water-free heating method, avoiding the hydrolysis reaction that may occur in a humid and hot environment, thereby better maintaining the original color of the coating and preventing early yellowing.

[0013] 2. No surface marks, high flatness: Due to the water-free heating method of this invention, the sheet is heated more evenly and shrinks more consistently. After forming, the product surface is smooth and flat, with no concave-convex marks, pressure marks, or micropores caused by moisture, and the appearance quality is significantly improved, and it is not prone to warping and cracking.

[0014] II. Process and control advantages 1. Precise temperature control, better process window: In this invention, the heating table and the heating plate as a pressure table can use electric heating or oil temperature heating, allowing for rapid and precise local temperature control. Operators can fine-tune the heating curve based on material thickness and location, avoiding local overheating (causing burning) or insufficient heating (resulting in incomplete forming). Compared to water temperature (constant 100°C), the temperature range of water-free heating in this invention is more flexible (e.g. 70-120°C), making it easier to find the best softening point of the material.

[0015] 2. High forming efficiency, short production cycle: This invention has a fast heating speed, eliminating the need to wait for water to boil or steam to generate. After forming, there is no need for a lengthy drying and dehumidifying process, greatly shortening the production cycle.

[0016] III. Material performance advantages 1. Better dimensional stability: The sheet does not absorb moisture and undergo subsequent drying during the entire process, avoiding secondary shrinkage and deformation caused by moisture ingress and egress. The finished product has better dimensional and shape stability, and is less likely to warp over time.

[0017] 2. Maintaining the initial physical properties of the material: Avoiding potential damage to the nitrocellulose coating and the underlying substrate (such as fiber cloth, non-woven fabric, cotton cloth, etc.), better maintaining the initial flexibility, tensile strength, and adhesion strength of the material.

[0018] IV. Production environment and operation advantages Cleaner and safer working environment: No hot water or steam, reducing the risk of slipping and falling in the workshop. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure diagram of the embodiment of the invention.

[0020] Figure 2 is the assembly structure diagram of the concave die, the forming die and the positioning die in the embodiment of the present application.

[0021] Figure 3 is Figure 2 the partial sectional view.

[0022] Figure 4 is the partial front sectional view of the assembly structure of the forming die, the positioning die and the die hole of the concave die in the embodiment of the present application.

[0023] Figure 5 is the working state diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the person in the art better understand the present application scheme, the following will combine the drawings and the embodiments to explain the embodiment of the present application in detail, by which the realization process of how to apply the technical means to solve the technical problem and achieve the corresponding technical effect can be fully understood and implemented. The embodiment of the present application and each feature in the embodiment can be combined with each other without conflict, and the formed technical scheme is within the protection scope of the present application.

[0025] Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without creative labor should be within the protection scope of the present application.

[0026] It should be noted that the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover the non-exclusive inclusion.

[0027] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, the present embodiment discloses a composite material sealing cap forming device, which comprises a heating table 1, a concave die 2, a plurality of forming dies 3, a pressing table 4 and a plurality of positioning dies 5.

[0028] The top surface of the heating table 1 is a table surface, on which a cloth base material such as fiber cloth, non-woven fabric, cotton cloth and the like is laid. The heating table 1 is connected with a connecting handle 8 on one side. The heating table 1 is internally provided with an electric heater, and the electric heater is electrically connected with an external power supply, thereby forming an electric heating table. Alternatively, the heating table 1 is internally provided with a liquid channel, and the liquid channel is connected with an oil temperature machine to form a liquid channel, thereby forming an oil temperature heating table.

[0029] The concave die 2 is placed on the table surface of the heating table 1 and presses the cloth base material, and the concave die 2 has a plurality of vertical through holes 2.1, which are arranged in a horizontal and vertical array. Each of the through holes 2.1 is a stepped hole composed of a small-diameter section and a large-diameter section, wherein the small-diameter section is at the lower end and the large-diameter section is at the upper end, and a step is formed at the connection between the small-diameter section and the large-diameter section. The lower end of each of the through holes 2.1, i.e., the lower end of the through hole 2.1, is arranged at the bottom surface of the concave die 2 close to the heating table 3, and the upper end of each of the through holes 2.1, i.e., the upper end of the through hole 2.1, is arranged at the top surface of the concave die 2 away from the heating table 3. The small-diameter section of each of the through holes 2.1 is used to place a piece of material, and the inner diameter of the small-diameter section of each of the through holes 2.1 matches the outer diameter of the piece of material.

[0030] Each positioning die 5 has a vertical center through hole, and the center through hole of each positioning die 5 is a stepped hole composed of a large-diameter section and a small-diameter section, wherein the large-diameter section is at the lower end and the small-diameter section is at the upper end. The lower end of each positioning die 5 is circumferentially formed with a ring platform 5.1, and the outer diameter of the ring platform 5.1 matches the diameter of the large-diameter section of the through hole 2.1. The lower end ring platform 5.1 of each positioning die 5 is coaxially installed in the large-diameter section of each through hole 2.1 of the concave die 2, and the ring platform 5.1 abuts against the step in the corresponding through hole 2.1. The upper end of each positioning die 5 is located above the corresponding through hole 2.1, and the large-diameter section of the center through hole of each positioning die 5 is coaxially aligned with the small-diameter section of the corresponding through hole 2.1.

[0031] Each forming die 3 includes a straight rod section 3.2 and a pressing end 3.1 at the lower end of the straight rod section, the outer diameter of the straight rod section 3.2 of the forming die 3 matches the diameter of the small-diameter section of the center through hole of the positioning die 5, the outer diameter of the pressing end 3.1 of the forming die 3 matches the diameter of the large-diameter section of the center through hole of the positioning die 5, and the outer diameter of the pressing end 3.1 of the forming die 3 matches the diameter of the small-diameter section of the through hole 2.1. The straight rod section 3.2 of each forming die 3 is coaxially installed in the small-diameter section of the center through hole of the positioning die 5, and the upper end of each forming die 3 protrudes out of the upper end of the center through hole of the corresponding positioning die 5, so that the upper end of each forming die 3 is suspended above the corresponding positioning die 5. The pressing end 3.1 of each positioning die 3 is located inside the large-diameter section of the center through hole of the corresponding positioning die 5, and the pressing end 3.1 of each positioning die 3 is aligned with the small-diameter section of the corresponding through hole 2.1. Alternatively, the bottom surface of the pressing end 3.1 protrudes out of the lower end of the large-diameter section of the center through hole of the corresponding positioning die 5, and the bottom surface of the pressing end 3.1 enters the small-diameter section of the corresponding through hole 2.1.

[0032] The portion of each forming mold 3 that protrudes from the upper opening of the positioning mold 5 is threaded onto a section adjacent to the upper end of the forming mold 3. A nut 6 is screwed onto the threaded section of each forming mold 3. A vertical spring 7 is fitted onto the outside of each positioning mold 5. The spring 7 is located between the lower ring 5.1 of each positioning mold 5 and the nut 6 on the corresponding forming mold 3. Furthermore, the lower end of the spring 7 contacts or connects to the top surface of the corresponding ring 5.1, and the upper end of the spring 7 contacts or connects to the bottom surface of the corresponding nut 6.

[0033] The pressure plate 4 is a heating plate with a built-in electric heater that is electrically connected to an external power source, thus forming an electric heating plate. Alternatively, the heating plate may have internal hydraulic channels that connect to an oil temperature controller, thus forming an oil temperature heating plate. The top of the pressure plate 4 is connected to an external pneumatic or hydraulic cylinder, and the bottom of the pressure plate 4 contacts the upper end of each molding die 3. Power is provided by the pneumatic or hydraulic cylinder to move the pressure plate 4 downwards to act on each molding die 3.

[0034] like Figure 5 As shown, during operation, the fabric substrate is laid flat on the surface of the heating table 1, and the concave mold 2 is placed on the surface of the heating table 1 and pressed down on the fabric substrate. At this time, the heating table 1 is activated to heat the various mold holes 2.1 of the concave mold 2.

[0035] After the die holes 2.1 of the concave mold 2 are heated to the set temperature, a sheet material is placed into the small diameter section of each die hole 2.1 of the concave mold 2. Then, each forming mold 3 is assembled onto the positioning mold 5, and the lower end ring 5.1 of each positioning mold 5 is installed into the large diameter section of each die hole 2.1. The pressure table 4 is then pressed onto the upper end of each forming mold 3. Subsequently, the pressure table 4 moves downward, pressing each forming mold 3 down until the pressing end 3.1 at the lower end of each forming mold 3 enters the small diameter section of the corresponding die hole 2.1, pressing the sheet material onto the fabric substrate. At the same time, the pressure table 4 starts heating, and the heat generated by the pressure table 4 is conducted to the corresponding sheet material through the forming mold 3, thereby heating the sheet material from above. The sheet material is heated by the preheated die holes 2.1 combined with the heat generated by the pressure table 4, causing the sheet material and the fabric substrate to combine and form a sealing cap. At this time, the spring 7 is compressed.

[0036] After the sealing cap is formed, the pressure table 4 is moved upward to disengage from the upper end of each forming mold 3. At this time, each forming mold 3 rebounds and resets under the elastic force of the corresponding spring 7, so that the forming mold 3 can be detached from the formed sealing cap.

[0037] The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings, and the embodiments described in the present application are merely a description of the preferred embodiments of the present application, and are not intended to limit the concept and scope of the present application. In the above specific embodiments, various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and such combination should also be considered as disclosed by the present disclosure, as long as it does not deviate from the concept of the present application. In order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0038] The present application is not limited to the specific details described in the above embodiments, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art within the scope of the technical concept of the present application and without departing from the design concept of the present application should fall within the protection scope of the present application. The technical content claimed by the present application has been fully recorded in the claims.

Claims

1. A composite closure cap forming apparatus, characterized by, It comprises a heating table (1), a concave die (2), a plurality of forming dies (3), a pressing table (4); the table top of the heating table (1) is used for laying the base material; The concave die (2) is placed on the table top of the heating table (1) and presses the base material, and the concave die (2) has a plurality of die holes (2.1) penetrating through the concave die (2), one end of each die hole (2.1) is provided with a hole opening on the side of the concave die (2) close to the heating table (3), and the other end of each die hole (2.1) is provided with a hole opening on the side of the concave die (2) away from the heating table (3); the inside of each die hole (2.1) is used for placing a material piece; A plurality of forming dies (3) each have one end as a pressing end, and the pressing end of each forming die (3) penetrates into each die hole (2.1) of the concave die (2) one by one; the other end of each forming die (3) is in contact with the pressing table (4), and the pressing table (4) applies force to the other end of each forming die (3), so that the pressing end of each forming die (3) presses the material piece in the corresponding die hole (2.1) onto the base material, and the heating table (1) heats the material piece in each die hole (2.1) of the concave die (2), so that each material piece is respectively compounded with the base material to form the sealing cap.

2. The composite closure cap forming apparatus of claim 1, wherein, Each die hole (2.1) is a stepped hole composed of a small-diameter section and a large-diameter section; the hole opening of the small-diameter section of each die hole (2.1) is provided on the side of the concave die (2) close to the heating table (3), and the hole opening of the large-diameter section of each die hole (2.1) is provided on the side of the concave die (2) away from the heating table (3); the material piece is placed in the small-diameter section of each die hole (2.1).

3. The composite closure cap forming apparatus of claim 2, wherein, The outer diameter of the pressing end of each forming die (3) matches the inner diameter of the small-diameter section of the die hole (2.1).

4. The composite closure cap forming apparatus of claim 2, wherein, It also comprises a plurality of positioning dies (5), each positioning die (5) has a center through hole, and one end of each positioning die (5) is formed with a ring table (5.1), the outer diameter of the ring table (5.1) matches the inner diameter of the large-diameter section of the die hole (2.1); the ring table of one end of each positioning die (5) is installed in the large-diameter section of each die hole (2.1) one by one and abuts against the stepped part in the corresponding die hole (2.1); Each forming die (3) penetrates through the center through hole of the positioning die (5) one by one, and the pressing end of each forming die (3) presses the material piece in the corresponding die hole (2.1) onto the base material.

5. The composite closure cap forming apparatus of claim 4, wherein, A section adjacent to the other end of each forming die (3) has a thread to form a threaded section, and a nut (6) is screw-connected to the threaded section of each forming die (3); A spring (7) is arranged between the nut (6) installed on each forming die (3) and the ring table (5.1) of the positioning die (5) penetrated by the forming die (3), one end of the spring (7) contacts or is connected to the nut (6), and the other end of the spring (7) contacts or is connected to the ring table (5.1).

6. The composite closure cap forming apparatus of any one of claims 1-5, wherein, The pressing table (4) is a heating plate, and when the heating plate is in contact with the other end of each forming die (3), the heat generated by the heating plate is conducted to the material piece in the corresponding die hole (2.1) through each forming die (3).

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