CN113211704A

CN113211704A - Film-coated rubber plug forming die and forming method

Info

Publication number: CN113211704A
Application number: CN202110612462.9A
Authority: CN
Inventors: 华一敏; 华国平; 朱剑军; 张晓晨
Original assignee: JIANGSU HUALAN NEW PHARMACEUTICAL MATERIAL CO Ltd
Current assignee: JIANGSU HUALAN NEW PHARMACEUTICAL MATERIAL CO Ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2021-08-06

Abstract

The invention discloses a film-coated rubber plug forming die and a forming method, wherein the forming die comprises an upper die core and a lower die core, the lower die core is provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the first cavity is used for forming the crown part of a rubber plug, the second cavity is used for forming the neck part of the rubber plug, and the bottom edge of the first cavity is provided with a blocking part for blocking the deviation of a film formed on the neck part of the rubber plug. The molding method comprises the following steps: placing the film-covered film into the first cavity of the lower mold core, and enabling the blocking part to be positioned at the periphery of the film-covered film; and pressing the upper mold core and the lower mold core, and vulcanizing the film-covered rubber sheet to form the rubber plug. Through the blocking part in the first cavity, the rubber plug is guaranteed to be heated to form a flowable rubber sheet in the vulcanization forming process, the flowable rubber sheet can only flow in the area limited by the blocking part, and the possibility of surface coating deviation of the rubber sheet is greatly reduced. The rubber plug forming method is that the rubber sheet with the film is placed inside the blocking part; preventing the occurrence of deflection under non-vertical forces.

Description

Film-coated rubber plug forming die and forming method

Technical Field

The invention relates to a forming die and a forming method, in particular to a forming die and a forming method of a film-coated rubber plug.

Background

The rubber plug is a medicine inner packaging product, the traditional rubber plug is made of rubber, but under specific conditions (such as acidity and alkalinity), components in the rubber plug made of the rubber can migrate into medicines in contact with the rubber plug to cause pollution, so that the health of a human body is influenced. Therefore, the surface-coated medical rubber plug comprises a bottle plug body, wherein the surface of the bottle plug body is provided with a layer of film, and the film has higher biological inertia and chemical stability compared with rubber when being contacted with a medicament, so that the quality of the medicament is better ensured.

The surface-coated medicinal rubber plug is divided into two types, the first type is the full-coated rubber plug provided in EP450098B1, and the full-coated rubber plug is prepared by vulcanizing and molding a rubber sheet and a film in a forming die with an upper cavity and a lower cavity. Although the fully-coated rubber plug can have certain chemical stability, when a medicine is packaged, a coating exists at the contact end of the edge of the crown part of the rubber plug and the edge of the plane of the opening of the medicine bottle, and the sealing performance of the medicine can be directly influenced due to the smooth surface of the coating. The second surface-coated medical rubber plug is a rubber plug neck-coated rubber plug provided in patent document CN106426699A, which is formed into a rubber plug neck with a coated film through a single vulcanization molding, and then is formed again, and the coated film needs to be subjected to secondary high temperature due to secondary molding, so that the coated film is damaged, and the coated film is easy to age; in addition, in the transportation process after the medicine is packaged, particularly, the preparation which is filled firstly and then sterilized is subjected to shaking due to the medicine, the rubber plug is provided with a naked plug neck part of the coated film and can be in direct contact with the medicine powder, the medicine liquid and the water injection, so that the medicine can enter the inverted foot naked plug position of the bottle opening through a gap between the coated film surface and the bottle wall and can contact the rubber without the coated film on the crown part of the rubber plug and the sealing surface of the bottle opening, and the quality of the medicine can be influenced certainly when the part without the coated film of the rubber plug is in contact with the medicine.

In order to solve the problems of the film-coated rubber plug, patent document CN105662859A proposes a film-coated rubber plug and a production method thereof, wherein a film is coated on the surface of the neck of the rubber plug, and the film-coated part extends from the surface of the neck of the rubber plug to the plane position where the crown of the rubber plug and the mouth of the bottle are sealed.

However, although the above-mentioned coated rubber plug solves the problem that the rubber plug is produced in the using process, the problem that the coated film is deflected occurs in the process of vulcanizing and forming the coated rubber plug by using the existing mold, which results in low yield. Patent document CN112008934A proposes a film-coated rubber plug forming mold and a forming method, wherein the forming mold comprises an upper mold core and a lower mold core; a first cavity and a second cavity which are communicated with each other are arranged on the lower mold core from top to bottom; the second cavity is internally provided with a second convex column extending towards the first cavity, the upper die core comprises an upper die core body and a first convex column, and the first convex column extends into the first cavity in the rubber plug forming process. The first cavity of this plug crown fashioned and the fashioned second cavity of plug neck all set up the mode of setting on the mold core down, have guaranteed that the plug has the mobile sheet rubber by the heating in vulcanization molding process, only can flow in the lower mold core, and its mobility is low, reduces because of flowing and causes the possibility of sheet rubber surface tectorial membrane skew.

However, although the problem of film deviation is solved to a certain extent, in the patent, because the mold is closed, the upper mold core and the lower mold core are close to each other, the rubber in the film-carrying film, the positioning film and the top film is pressurized and filled into the cavity to form the shape of the film-covered rubber plug, in the process, the bottom of the film-carrying film is not completely vertical from top to bottom under the pressure from the rubber material and has a lateral force due to the influence of the flatness of the mold, the layout of the mold and the uniform heating degree of the mold, and therefore, the film deviation can still be caused.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a film-coated rubber plug forming die which can effectively solve the problem of film deviation of a film-coated rubber plug;

the invention also aims to provide a forming method of the film-coated rubber plug.

The technical scheme is as follows: the rubber plug forming die comprises an upper die core and a lower die core, wherein the lower die core is provided with a first cavity and a second cavity which are communicated with each other from top to bottom, the first cavity is used for forming the crown part of a rubber plug, the second cavity is used for forming the neck part of the rubber plug, and the bottom edge of the first cavity is provided with a blocking part used for blocking the deviation of a rubber sheet formed by the neck part of the rubber plug.

In the rubber plug forming die, the blocking part faces the inside of the first cavity; the blocking part is positioned at the periphery of the rubber sheet formed at the neck part of the rubber plug.

In the rubber plug forming die, the blocking part is a convex column extending towards the inside of the first cavity; the blocking part is a convex ring surrounding the periphery of the rubber sheet formed on the neck of the rubber plug.

In the rubber plug forming die, the blocking parts are arranged at intervals on the periphery of a rubber sheet formed on the neck part of the rubber plug; the blocking part is arranged at least two opposite parts of the periphery of the rubber sheet formed on the neck of the rubber plug.

In the rubber plug forming die, the height of the section of the blocking part is not more than 2mm, and the width of the blocking part is not more than 3 mm. The rubber sheet formed on the neck of the rubber plug is a film with a film.

The rubber plug forming method using the rubber plug forming die comprises the following steps,

placing the film-covered film into the first cavity of the lower mold core, and enabling the blocking part to be located at the periphery of the film-covered film;

and pressing the upper mold core and the lower mold core, and vulcanizing the film-carrying rubber sheet to form the rubber plug.

The method also comprises the step of laying a layer of top film on the assembly before the upper mold core and the lower mold core are pressed, wherein the top film can cover the first cavity.

Has the advantages that: the technical scheme of the invention has the following advantages:

(1) through the blocking part in the first cavity, the rubber plug is guaranteed to be heated to form a flowable rubber sheet in the vulcanization forming process, the flowable rubber sheet can only flow in the area limited by the blocking part, and the possibility of surface film coating deviation of the rubber sheet caused by lateral force is greatly reduced.

(2) The blocking part is positioned at the periphery of the film-covered rubber piece, and when the blocking part is a convex ring surrounding the film-covered rubber piece for one circle, the convex ring fixes the film-covered rubber piece, so that the film-covered rubber piece can only be extruded by the rubber material and then moves downwards, and can not shift towards the periphery.

(3) According to the rubber plug forming method provided by the invention, a film with a film is placed at the bottom of a first cavity and is positioned at the inner side of a blocking part; in the pressing and vulcanization molding processes of the upper mold core and the lower mold core, the film-carrying rubber sheet is limited in a certain area by the blocking part, so that the film is prevented from deviating under the action of non-vertical force, and the film is positioned more accurately.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a first schematic view illustrating a pressing process of an upper mold core and a lower mold core according to an embodiment;

FIG. 3 is a second schematic view illustrating a pressing process of the upper mold core and the lower mold core according to the embodiment;

FIG. 4 is a cross-sectional view of the coated rubber plug manufactured by the forming mold provided in the embodiment;

fig. 5 is a bottom view of the film coated rubber plug manufactured by the forming mold provided in the embodiment.

Detailed Description

The technical scheme of the invention is further explained by combining the drawings in the specification.

As shown in fig. 1, the present embodiment provides a plug forming mold, which includes:

an upper mold core 1 and a lower mold core 2; the upper mold core 1 comprises an upper mold core body and a first convex column 11; the lower mold core 2 is provided with a first cavity 22 and a second cavity 23 which are communicated with each other from top to bottom; the first cavity 22 is used for forming the crown part of the rubber plug, and the second cavity 23 is used for forming the neck part of the rubber plug; the second cavity 23 has a second boss 21 therein extending toward the first cavity 22.

The bottom edge of the first cavity 22 is provided with a blocking part 24 for blocking the deviation of the film-covered rubber sheet 3, the blocking part 24 is a convex ring which surrounds the periphery of the film-covered rubber sheet 3 and extends towards the inside of the first cavity 22, the section height of the convex ring is 2mm, the width of the convex ring is 3mm, and the specific section height and width can be adjusted according to the size and performance index of the rubber plug; the blocking part 24 can also be a convex column arranged at the periphery of the film-covered film 3, and can be provided with a plurality of convex columns which are arranged at intervals at the periphery of the film-covered film 3, wherein the plurality of convex columns are preferably arranged oppositely, so that the film-covered film 3 can be better blocked to be outwards deviated in the pressing process of the upper mold core 1 and the lower mold core 2 and the vulcanization process.

In the forming process of the rubber plug, the first convex column 11 extends into the first cavity 22 and can be matched with the second convex column 21 to clamp the rubber sheet to be vulcanized; in order to better ensure the positioning of the film to be vulcanized, the top end of the second convex column 21 is flush with the lower surface of the first cavity 22.

In the above rubber plug forming mold, the upper mold core 1 may be any mold core in the prior art, preferably, has a structure that the formed cavity plug crown portion has an annular protrusion and/or a bump, and is used for preventing the rubber plug from being adhered in the conveying process.

In the rubber plug forming die, the first cavity 22 is a cylindrical cavity and can form a rubber plug crown part after vulcanization forming; the lower mold core 2 is provided with a lower mold core body, the lower mold core body is arc-shaped at the transition position of the first cavity 22 and the second cavity 23, and the covering film extending to the transition position is ensured not to be damaged in the forming process and the subsequent using process. The present embodiment is an improved technical solution based on the rubber plug forming mold disclosed in the prior art CN112008934A, and the structures not described in detail in the present embodiment are all the same as the prior art.

Example 2

In this embodiment, the film is a rubber sheet and is an unvulcanized film stock; the filmed film is a film coated on one side of the raw film, and the film can be any film suitable for a filmed rubber plug in the prior art.

In this embodiment, a method for forming a rubber plug by using the rubber plug forming mold of embodiment 1 is provided, which includes the following steps:

(1) attaching the film-carrying film 3 and the positioning film 4 to form an assembly; the film 3 with film is a circular film, the diameter of the film is smaller than that of the first cavity 22, and the specific diameter of the film is determined according to the area of the film on the formed rubber plug;

(2) placing the combination into the first cavity 22 of the lower mold core 2 and so that the combination is inside the torus; laying a layer of top film 5 on the assembly, as shown in fig. 2, the top film 5 covering the first cavity 22;

(3) and pressing the upper mold core 1 and the lower mold core 2, and vulcanizing the assembly and the top rubber sheet 5 to form the rubber plug.

Wherein the diameter of the positioning film 4 is the same as the diameter of the first cavity 22, which ensures the positioning of the film strip 3 in the first cavity 22. The filmed strip 3 may be placed in the first cavity without forming an assembly with the positioning strip 4, as shown in fig. 3. This is because the stopper of the present embodiment already limits the position of the filmed film 3 at the periphery of the filmed film 3, preventing it from being displaced during the press-fitting of the upper and

lower cores

1 and 2 and the vulcanization molding. When the filmed rubber sheet 3 and the positioning rubber sheet 4 form a combined piece to be put in, the top rubber sheet 5 and the positioning rubber sheet 4 can be pressed into the first cavity by the first convex column 11 and are matched with the second convex column 21 to clamp and position the rubber sheets, so that the film positioning accuracy in the vulcanization process is further realized, the filmed rubber plug 6 prepared by the method is shown in fig. 4-5, the filmed rubber plug 6 comprises a rubber plug crown part 61, a rubber plug neck part 62, an annular groove 63 made by a blocking part of a forming die and a plug column 64 of the rubber plug neck part 62, and a film coating part extends from the surface of the rubber plug neck part to the inner boundary of the annular groove 63, so that the filmed rubber plug is limited at the circular boundary of the annular groove 63 without film deviation, and therefore, the invention has accurate film coating positioning and high consistency.

In the rubber plug forming method, the top rubber sheet 5 does not need to be laid on the assembly, the laid top rubber sheet 5 also connects the formed rubber plugs into a whole, and the rubber plugs can be finally formed through the subsequent edge punching step, so that the production efficiency is improved.

The lower bottom surface, namely the sealing surface, of the rubber plug crown part 61 of the film-coated rubber plug 6 obtained by the rubber plug forming die is provided with an annular groove 63, and the periphery of the rubber plug is covered by an aluminum cover in a rolling way when being sealed, so that the annular groove 63 can be filled with rubber materials which are extruded by the aluminum cover and then deform, and the sealing performance of products cannot be influenced.

Claims

1. The utility model provides a plug forming die, includes mold core (1) and lower mold core (2), lower mold core (2) top-down has first cavity (22) and second cavity (23) that communicate each other, first cavity (22) are used for plug crown shaping, second cavity (23) are used for plug neck shaping, its characterized in that, the bottom edge of first cavity (22) is provided with and is used for blockking stop part (24) of the fashioned film skew of plug neck.

2. The plug forming die according to claim 1, characterized in that the blocking portion (24) is directed towards the inside of the first cavity (22).

3. The mold for forming rubber plugs according to claim 1, wherein the blocking portion (24) is located at the periphery of the rubber plug neck formed rubber sheet.

4. The rubber plug forming die according to claim 1, wherein the blocking portion (24) is a convex column extending towards the inside of the first cavity (22).

5. The mold for forming rubber plug according to claim 1, wherein the blocking portion (24) is a convex ring surrounding the periphery of the rubber sheet formed on the neck of the rubber plug.

6. The rubber plug forming die according to claim 1, wherein the blocking parts (24) are arranged at intervals on the periphery of the rubber sheets formed on the neck of the rubber plug.

7. The rubber plug forming die according to claim 1, characterized in that the blocking portion (24) is provided with at least two opposite edges at the periphery of the rubber sheet formed at the neck of the rubber plug.

8. The rubber plug forming die according to claim 1, wherein the cross-section height of the blocking portion (24) is not more than 2mm, and the width is not more than 3 mm.

9. A plug forming method using the plug forming mold according to any one of claims 1 to 8, comprising the steps of:

placing the film (3) into the first cavity (22) of the lower mold core (2), and enabling the blocking part (24) to be located on the periphery of the film (3);

and pressing the upper mold core (1) and the lower mold core (2), and vulcanizing the film rubber sheet (3) with the film to form the rubber plug.

10. The rubber plug forming method according to claim 9, further comprising, before the pressing of the upper mold core (1) and the lower mold core (2), laying a layer of top rubber sheet (5) on the film-coated rubber sheet (3), wherein the top rubber sheet (5) can cover the first cavity (22).