A multi-layer co-injection blow molding method for preparing a container and a blow molding flow channel structure thereof

Abstract

The present invention provides a multi-layer co-injection blow molding method for preparing a container and its blow molding runner structure, wherein a multi-channel hot runner is provided, and the hot runner carries multiple layers of blow molding raw materials; a blow molding port is provided on one side of the hot runner to receive the blow molding raw materials in the hot runner, which are collected at the blow molding port and enter the mold for blow molding, and the lengths of the multiple runners provided in the hot runner are inconsistent, forming a material flow rate difference, which flows into the blow molding port and then undergoes blow molding. The present invention provides a multi-layer co-injection blow molding method for preparing a container and its blow molding runner structure, which circulates multiple layers of material through a multi-channel plate, thereby expanding the flow time difference of different materials in the runner, forming different cooling times for materials of different layers, and the structures blown out after being collected in the mold are no longer the same, the outer layer has a long flow time, the flow time in the blow molding port is increased, the cooling time is also increased, and the outer layer is formed before the inner layer material, without affecting the composition of the inner layer material.

Description

Technical Field

[0001] The invention relates to a multi-layer co-injection blow molding method for preparing a container and a blow molding flow channel structure thereof. Background Art

[0002] The medicine container is the storage terminal of the medicine and carries the medicine. Therefore, the container not only has the carrying function, but also needs to seal and store the medicine. Therefore, many bottles need to adopt a multi-layer material structure. The existing technology uses co-extrusion injection molding to perform multi-layer injection molding. The multi-layer injection molding raw materials are collected into the mold through the runner and cooled and formed. The container molded in this way has more burrs and the multi-layer materials melt each other more, which is not suitable for medical medicine containers. The injection molding process has a small application range and is not suitable for small-sized medicine containers. Medicine containers are generally formed by blow molding, which can ensure that the inner wall of the container is smooth. However, since the blow molding step will affect the instability of the multi-layer material, the collection in the hot runner will cause the multi-layer inner walls of the container to melt each other, or form multi-layer interference, affecting the final molding. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-layer co-injection blow molding method for preparing containers and its blow molding flow channel structure, aiming to provide a method that can bring together multiple layers of materials for injection molding and then perform blow molding, so as to facilitate the production of medical drug containers to improve the applicability of container materials to drugs, and improve the quality and production efficiency of containers.

[0004] To solve the above technical problems, the technical solution of the present invention is as follows: a multi-layer co-injection blow molding method for preparing a container, wherein a multi-channel hot runner is provided, and the hot runner carries multiple layers of blow molding raw materials; a blow molding port is provided on one side of the hot runner, which receives the blow molding raw materials in the hot runner, collects the blow molding raw materials at the blow molding port, and enters the mold for blow molding; the lengths of the multiple runners provided in the hot runner are different, resulting in a difference in material flow rate, and the material flows into the blow molding port and then flows into the mold for blow molding;

[0005] The blow molding port is provided with a plurality of flow channels, which carry multiple layers of blow molding materials to flow in the blow molding port. The flow rate difference is formed by the difference in the flow channels of the blow molding port, so that different layers of materials flow out of the blow molding port in different lengths of time, forming different cooling effects;

[0006] Its blow molding structure includes a hot runner and a blow molding port. The blow molding port is connected to an external blow molding device to output circulating materials. There are multiple hot runners connected to the blow molding ports.

[0007] Furthermore, the center of the blow molding port is set as an inner layer flow channel, which is connected to the hot runner and adopts the shortest flow channel for circulation to carry the inner layer raw material.

[0008] Furthermore, the outer periphery of the center of the blow molding port is set as an outer layer flow channel, which is connected to the hot runner and adopts a long flow channel for circulation to carry the outer layer raw material.

[0009] Furthermore, the outer layer flow channels are provided in plurality and are distributed outwardly around the blow molding port. The flow channels are longer toward the outer layer and the material flows longer therein.

[0010] Furthermore, a plurality of interference rings are provided in the outer layer flow channel, connecting the outer layer flow channel and evenly distributed on the outer layer flow channel.

[0011] Furthermore, the material flows at different speeds and durations in the inner and outer runners, and the material is cooled to different degrees before being blow-molded after being gathered at the blow molding port. Due to the different cooling degrees, the inner and outer layer materials no longer interfere with each other, thereby achieving unified blow molding.

[0012] Furthermore, the hot runner includes an inner runner plate, an outer runner plate, a bottom plate and a cover plate; the shortest runner is provided on the inner runner plate, connected to the blow molding port; the outer runner is located on one side of the inner runner, connected to the blow molding port; the bottom plate and the cover plate are respectively located on both sides of the inner runner plate or the outer runner plate, covering the inner runner plate or the outer runner plate.

[0013] Furthermore, at least one outer layer flow channel plate is provided, and one outer layer flow channel is provided on the outer layer flow channel plate to carry the outer layer raw material.

[0014] Furthermore, each of the outer flow channel plates is provided with a main flow channel and a secondary flow channel. The main flow channel is arranged on the outer flow channel plate and connected to the flow channel inlet. The secondary flow channel is located on one side of the main flow channel and connected to the blow molding port.

[0015] Furthermore, the width of the secondary flow channel is smaller than the width of the primary flow channel.

[0016] Compared with the prior art, the present invention provides a multi-layer co-injection blow molding method for preparing containers and its blow molding flow channel structure, which circulates multi-layer materials through a multi-flow channel plate, thereby expanding the circulation time difference of different materials in the flow channel, and then uses the flow channel speed difference formed by different flow channels after entering the blow molding port, resulting in different cooling times for materials of different layers. After being gathered into the mold, the blow-molded structures are no longer the same. The inner layer material contacts the agent, so its material is complex and is first gathered into the blow molding port. The outer layer material is different from the inner layer and is used for connection and protection. It enters the blow molding port in the last step, so that the material forms different degrees of convergence at the blow molding port. The outer layer has a long flow time, and the flow time in the blow molding port increases, and the cooling time also increases. It is formed before the inner layer material, and the inner layer material will be included in the blow molding to form the outer layer product without affecting the composition of the inner layer material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A front view showing one embodiment of the present invention.

[0018] Figure 2 An AA cross-sectional view is shown of one embodiment of the present invention.

[0019] Figure 3 An enlarged view of point B is shown according to one embodiment of the present invention.

[0020] Figure 4 A top view of a flow channel according to an embodiment of the present invention is shown.

[0021] Among them: 1. Hot runner, 2. Blow molding port, 3. Inner runner, 4. Outer runner, 5. Interference ring, 6. Inner runner plate, 7. Outer runner plate, 8. Bottom plate, 9. Cover plate, 10. Main runner, 11. Secondary runner, 12. Shortest runner, 13. Long runner. DETAILED DESCRIPTION

[0022] As shown in the figure, in one embodiment, it is necessary to prepare a double-layer material pharmaceutical container, which adopts a multi-layer co-injection blow molding method, sets two feed pumps, and injects the material into the blow molding port 2 through a multi-layer hot runner. A plurality of flow channels are set in the blow molding port 2 to carry the multi-layer blow molding raw materials to flow in the blow molding port 2. The flow rate difference is formed by the difference in the flow channels of the blow molding port, so that the materials of different layers flow out of the blow molding port after different lengths of time, forming different cooling effects.

[0023] Furthermore, the center of the blow molding port 2 is set as an inner layer flow channel 3, which is connected to the hot runner 1 and adopts the shortest flow channel for circulation to carry the inner layer raw material.

[0024] Furthermore, the outer periphery of the center of the blow molding port 2 is set as an outer layer flow channel 4, which is connected to the hot runner 1 and adopts a long flow channel for circulation to carry the outer layer raw material.

[0025] Furthermore, a plurality of interference rings 5 ​​are provided in the outer layer flow channel 4 , connecting the outer layer flow channel 4 and evenly distributed on the outer layer flow channel 4 .

[0026] Furthermore, the flow speed and duration of the material in the inner layer flow channel 3 and the outer layer flow channel 4 are different, and the material is cooled to different degrees, and then blow-molded after being gathered at the blow molding port. Due to the different cooling degrees, the outer layer material flows over a longer distance and is cooled for a longer time, and the stability of the internal material is higher than that of the inner layer material. Therefore, in the blow molding port 2, the inner layer material and the outer layer material no longer interfere with each other, and unified blow molding is achieved.

[0027] Furthermore, the hot runner 1 includes an inner runner plate 6, an outer runner plate 7, a bottom plate 8 and a cover plate 9; since the product is a two-layer material, the inner runner plate 6 and the outer runner plate 7 are combined into one, which is the runner plate in the figure. The shortest runner is arranged on one side of the runner plate, away from the blow molding port 2, and connected to the blow molding port 2; the long runner is located on the other side of the runner plate, close to the blow molding port 2, and connected to the blow molding port 2; the bottom plate 8 and the cover plate 9 are respectively located on both sides of the runner plate, covering the runner plate.

[0028] Furthermore, the outer layer flow channel plate is provided with a main flow channel 10 and a secondary flow channel 11. The main flow channel 10 is arranged on the outer layer flow channel plate 7 and connected to the flow channel inlet. The secondary flow channel 11 is located on one side of the main flow channel 10 and connected to the blow molding port 2.

[0029] Furthermore, the width of the secondary flow channel 11 is smaller than the width of the primary flow channel 10 .

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A multi-layer co-injection blow molding flow channel structure for preparing a container, characterized in that: A hot runner with multiple runners is provided, and the hot runner carries multiple layers of blow molding materials; a blow molding port is provided on one side of the hot runner, which receives the blow molding materials in the hot runner, collects them at the blow molding port and enters the mold for blow molding; the lengths of the multiple runners provided in the hot runner are inconsistent, resulting in a difference in material flow rate, and the materials flow into the mold after entering the blow molding port, and then the blow molding operation is performed; The blow molding port is provided with multiple flow channels, which carry multiple layers of blow molding materials to flow in the blow molding port. The flow rate difference is formed by the difference in the flow channels of the blow molding port, so that different layers of materials flow out of the blow molding port in different lengths of time, forming different cooling effects; The blow molding flow channel structure includes a hot runner and a blow molding port, wherein the blow molding port is connected to an external blow molding device to output the circulating material; a plurality of hot runners are provided, connected to the blow molding port; The center of the blow molding port is set as an inner layer runner, connected to the hot runner, using the shortest runner for circulation, and carrying the inner layer raw material; the periphery of the center of the blow molding port is set as an outer layer runner, connected to the hot runner, using the long runner for circulation, and carrying the outer layer raw material; The outer layer flow channel is provided with a plurality of channels, which are distributed outwardly around the blow molding port. The flow channel length becomes longer as it goes to the outer layer, and the material flows longer in the flow channel. A plurality of interference rings are arranged in the outer layer flow channel, connecting the outer layer flow channel and evenly distributed on the outer layer flow channel.

2. A multi-layer co-injection blow molding flow channel structure for preparing a container according to claim 1, characterized in that: The hot runner includes an inner runner plate, an outer runner plate, a bottom plate and a cover plate; the shortest runner is provided on the inner runner plate and connected to the blow molding port; the outer runner is located on one side of the inner runner and connected to the blow molding port; the bottom plate and the cover plate are respectively located on both sides of the inner runner plate or the outer runner plate, covering the inner runner plate or the outer runner plate.

3. A multi-layer co-injection blow molding flow channel structure for preparing a container according to claim 2, characterized in that: There is at least one outer layer flow channel plate, and one outer layer flow channel is provided on the outer layer flow channel plate to carry the outer layer raw material.

4. A multi-layer co-injection blow molding flow channel structure for preparing a container according to claim 3, characterized in that: Each of the outer flow channel plates is provided with a main flow channel and a secondary flow channel. The main flow channel is arranged on the outer flow channel plate and connected to the flow channel inlet. The secondary flow channel is located on one side of the main flow channel and connected to the blow molding port.

5. A multi-layer co-injection blow molding flow channel structure for preparing a container according to claim 4, characterized in that: The width of the secondary flow channel is smaller than the width of the primary flow channel.

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