CN1050090C - Manufacturing method of airtight capsule - Google Patents

Abstract

A method for manufacturing air-tight bag body includes such steps as extruding out a fused hollow tubular blank from the front ring of extruder, directly introducing it between the left and right shaping moulds, symmetrically arranging multiple air-tight cavities between said cavities, and vacuumizing the cavity of mould to make the fused hollow tubular blank be adsorbed on the surface of cavity of mould.

Description

Manufacturing method of airtight capsule

Generally, airtight bags made of thermoplastic materials, such as polyurethane, have been widely used in filling and protecting air cushions of sports equipment. For example: insoles of sports shoes or knee pads etc., which are mainly installed with airtight capsules as shock-absorbing air cushions to protect users from sports injuries. Therefore, the scope of application of this kind of airtight bag is very wide, so it is extremely valuable in industry; and the current manufacturing method of this kind of airtight bag is to put thermoplastic raw materials into the feeding cylinder, and then pass through The heating cylinder and the screw of the extruder are pushed forward, and then the molten plastic is extruded out of the die head to form a hollow tubular blank, and the blank is introduced into an opened forming mold. After the molding molds on both sides are closed, another blow pin (Blow Pin) needs to be inserted into the molding mold to blow air, so that only the hollow tubular billet in the molding mold is affected by the injected gas, causing expansion and Close to the inner wall of the mold cavity of the molding mold to form a structure with the same shape as the mold cavity; after that, after a short cooling process, the blowing tip can be removed and the molding mold can be opened to produce a ventilated The semi-finished structure of the capsule (as shown in the first figure). However, if a complete airtight bag (air cushion) structure is to be made, it is necessary to manually fill the semi-finished bag with air, and then use a high-frequency machine to fuse and seal the vent (T) of the semi-finished bag. Finally, the burr on the periphery of the fusion seal is trimmed, and the manufacturing process of an airtight capsule (air cushion) is completed. To sum up, in the conventional manufacturing method, a semi-finished capsule structure with a vent (T) must be made by inflating the molding die with a blowing pin, and at the same time, it is time-consuming and labor-intensive to inflate on site and borrow The ventilation port (T) is sealed by fusion of high-frequency machines, so it is difficult to say that it is suitable for industrial utilization in terms of machine tools, manufacturing processes, or manufacturing efficiency, and it requires a lot of manpower, time-consuming and labor-intensive work to re-add semi-finished products , Obviously not in line with the trend of industrial automation.

In view of this, the inventor of this case has been engaged in the research and manufacture of airtight bladders (air cushions) for many years, and after several trials and tests of physical samples, he finally created and completed the present invention. Its main purpose is to provide a The manufacturing method of the airtight bag makes it possible to make a hollow airtight bag (air cushion) in one piece, and does not need to be reprocessed to improve its manufacturing efficiency and product quality;

Another object of the present invention is to provide a method for manufacturing an airtight bag, which improves the drawbacks of the prior art that requires reprocessing and consumes machines and equipment.

The object of the present invention is achieved in the following way: a method for manufacturing an airtight bladder, which is to directly introduce the melted hollow tubular blank extruded by the annular die head at the front end of the extruder into the space between the left and right forming dies opened on both sides. , and the inner side walls of the left and right forming molds are all symmetrically provided with a plurality of airtight chamber mold cavities, which are characterized in that: between the plurality of airtight mold cavities and the hollow chamber of the mould, a plurality of air-tight chambers are fixed respectively. components, and the hollow chambers of the mold are respectively connected with the suction conduits of a vacuum pump, and the vacuum pump will pump the hollow chambers of the mold into a vacuum state, so that the molten hollow tubular blank film can be adsorbed on the air chamber of the mold The wall of the mold cavity is made into a completely airtight airtight capsule with multiple air chambers.

The purpose of the present invention can also be achieved by the following measures, the plurality of air chamber mold cavities of the forming mold can be communicated, so that the airtight bag body made has a plurality of air chamber structures connected or the forming mold can also be concavely provided with independent air chambers. The air chamber mold cavity makes the airtight bag body made of it have an independent air chamber structure; the left and right forming molds can also be flat on one side, and a plurality of air chamber mold cavities are recessed on the other side , so that the airtight bag made of it forms an air cushion structure with a single-sided embossed air chamber.

The main technology of the airtight bag manufacturing method of the present invention is to use the method of evacuating the hollow chambers of the left and right forming molds into a vacuum state, so that the molten tubular blank can be completely adsorbed on the inner wall surface of the air chamber mold cavity of the mould. , so as to make a completely airtight airtight bag in one piece. Therefore, the present invention does not need to use blowing pins and high-frequency equipment in the prior art, and does not need time-consuming and labor-intensive reprocessing operations, so the manufacturing method of the present invention is obviously more advanced than the manufacturing method in the prior art. It has industrial application value, and can specifically improve the manufacturing efficiency and quality of the airtight bag body.

Description of drawings:

Fig. 1 is a schematic diagram of the semi-finished structure of an airtight bag in the prior art, and there is a vent (T) structure at its top edge.

Fig. 2 is a schematic diagram of the structure of the hollow airtight capsule integrally produced by the manufacturing method of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of introducing the melted hollow tubular billet into the opened left and right molding dies of the present invention.

Fig. 4 is a schematic diagram of the cross-sectional structure action of the hollow chambers of the left and right molding dies in Fig. 3 being evacuated and absorbing the molten tubular blank.

Fig. 5 is a schematic cross-sectional structure diagram of the left and right molding dies in Fig. 4 after the mold opening, mold closing and air extraction are completed.

Fig. 6 is a cross-sectional structure and a schematic diagram of the operation of injecting gas into the hollow chambers of the left and right forming molds in Fig. 5 and opening the molds to complete the manufacture of the airtight capsule.

The present invention will be described in detail below in conjunction with embodiment and accompanying drawing;

Please cooperate with Fig. 2 to Fig. 6 first, the manufacturing method of the airtight capsule of the present invention is to extrude the molten hollow tubular blank 30 from the front end ring die of the extruder, and directly introduce it into the opened left and right sides. Between the molding dies 10,20, the inner wall surfaces of the left and right molding dies 10,20 are all symmetrically recessed with a plurality of airtight chamber mold cavities 12,22, and the plurality of airtight chamber mold cavities 12,22 are connected with the mould. Between the hollow chambers 11 and 21, a plurality of ventilation elements 15 and 25 are respectively fixed, so that the gas can flow through the end surface slots 151 and 251 of the ventilation parts 15 and 25 to the airtight chamber mold cavities 12 and 22 of the mould. Between the hollow chambers 11, 21, the hollow chambers 11, 21 of the left and right forming molds are respectively connected with the suction conduits 111, 211 of a vacuum pump, so when the left and right forming molds 10, 20 are in the Immediately before the mold is closed, the hollow chambers 11, 21 of the forming mold are evacuated by a vacuum pump, so that the molten hollow tubular blank 30 film can be adsorbed to the airtight chamber cavity 12, 22 of the forming mold on both sides. wall, as shown in Figure 4. When the molten hollow tubular stock 30 is completely adsorbed on the wall surfaces of the multiple air chamber mold cavities 12, 22 of the forming mold, the mold closing operation (as shown in Figure 5 ) can be carried out, and then a completely airtight and multiple mold cavity can be made. The air-tight capsule structure of the air chamber is cooled and injected with an appropriate amount of air between the mold cavities 11 and 21, which is beneficial to the completion of the demoulding operation (as shown in Figure 6). In this way, it can be integrated into a complete Those with airtight airtight capsule 31 products;

The material adopted in the airtight bag body 31 made by the present invention is a thermoplastic material (such as: polyurethane), and it can also be a plastic aluminum alloy material, as shown in Fig. 2 The plurality of air chambers 32 of the airtight bag body 31 can be connected to each other, or can be independent air chambers 33 . In addition, one side of the air chamber bag 31 may be flat, while the other side may be embossed with a plurality of air chambers 32 , so that the airtight bag body 31 forms an air cushion structure with a single embossed air chamber 32 .

In summary, the manufacturing method of the airtight bag of the present invention, its main technique is to utilize the method of vacuumizing the hollow chambers of the left and right forming molds, so that the molten tubular blank can be completely adsorbed on the surface of the mold. The inner wall surface of the cavity of the air chamber is integrally formed into a completely airtight airtight capsule. Therefore, the present invention does not need to use blowing pins and high-frequency equipment in the prior art, and does not need time-consuming and labor-intensive reprocessing operations, so the manufacturing method of the present invention is obviously more advanced than the manufacturing method in the prior art. It has industrial application value, and can specifically improve the manufacturing efficiency and quality of the airtight bag body.

Claims (4)

1. A method of manufacturing an airtight capsule, the molten hollow tubular blank extruded from the front end ring die of the extruder is directly introduced into the left and right forming dies opened on both sides, and the left and right forming The inner wall of the mold is symmetrically recessed with a plurality of airtight cavity mold cavities, which is characterized in that: between the plurality of airtight mold cavities and the hollow cavity of the mould, a plurality of ventilation elements are respectively fixed, and the hollow cavity of the mold The chambers are respectively connected with the suction conduits of a vacuum pump, and the vacuum pump will pump the hollow chamber of the mold into a vacuum state, so that the molten hollow tubular blank film can be adsorbed on the wall surface of the air chamber cavity of the mold to form a Completely airtight airtight bag with multiple air chambers. 2. The method for manufacturing an airtight bag according to claim 1, wherein the plurality of air chamber cavities of the forming mold can communicate with each other, so that the airtight bag made has a plurality of connected air chamber structures . 3. The manufacturing method of the airtight bag according to claim 1, characterized in that the forming mold can also be recessed with an independent air chamber cavity, so that the airtight bag made has an independent air chamber structure . 4. The method of manufacturing an airtight bag according to claim 1, wherein the left and right forming molds can also be flat on one side, while the other side is concavely provided with a plurality of air chamber mold cavities, so that The manufactured airtight bag body forms an air cushion structure with a single-sided embossed air chamber.

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