A plastic sheet blister forming mold

Abstract

The present invention discloses a plastic sheet blister forming mold, which solves the technical problem that it is difficult to form blisters of some shapes and needs to be improved to increase the yield rate. The present invention includes a male mold, a female mold and a demolding auxiliary template. The male mold and the demolding auxiliary template are connected by a first elastic member. A blister forming protrusion is provided on the male mold, a through groove is provided on the demolding auxiliary template, and the blister forming protrusion passes through the through groove. The female mold is provided with a blister forming groove matching the blister forming protrusion. A blowing assembly is provided on the male mold, and an exhaust assembly is provided on the female mold. The present invention has the advantages of good blister forming effect, high yield rate and wide adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of plastic hard sheet blister forming, and in particular to a hard sheet blister forming mould. Background Art

[0002] Blister packaging is an important form of drug packaging. Therefore, the quality of blister molding is extremely important for drug packaging companies. At present, blister molding is carried out by blow molding, but the difficulty of blister molding is different for drugs of different dosage forms. For blister in the shape of capsule, due to its long strip shape, both ends are very likely to break during molding. In order to solve this industry problem, suitable materials or improved equipment are currently used to overcome it. However, for the well-formed polyvinyl chloride material, it has non-degradable properties, and the precipitation of plasticizer is harmful to the human body, which is contrary to environmental protection requirements. At present, Japan has widely adopted polypropylene materials for drug packaging, and my country has gradually tended to reduce the use of polyvinyl chloride. And for equipment improvement, it will inevitably lead to a substantial increase in cost, which is not conducive to the willingness of pharmaceutical factories to accept. Therefore, it is urgent to adopt other improved methods to overcome the problem of blister molding difficulties. And the present invention is just in this context. After more than half a year, through repeated experiments and improvements, the blister molding problem of non-polyvinyl chloride hard sheets on current drug packaging equipment is finally solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve the difficulty in molding non-polyvinyl chloride medicinal hard tablets and various styles of blisters, and to make improvements to solve the problem of blister molding of various drug packaging styles.

[0004] The present invention is achieved through the following technical solutions:

[0005] A plastic hard sheet blister forming mold comprises a male mold, a female mold and a demoulding auxiliary template, wherein the male mold and the demoulding auxiliary template are connected via a first elastic member, the male mold is provided with a blister forming protrusion, the demoulding auxiliary template is provided with a through groove, the blister forming protrusion passes through the through groove, the female mold is provided with a blister forming groove matching the blister forming protrusion, the male mold is provided with an air blowing component, and the female mold is provided with an exhaust component.

[0006] In view of the prior art, it is difficult to form some shaped blisters perfectly. If PVC materials that have been formed are used, it is not conducive to drug safety. And if the equipment is improved, the investment cost will be greatly increased, which is not conducive to the popularization and application of environmentally friendly materials. Therefore, the present invention makes improvements in the mold and focuses on solving the problem of difficult forming of non-PVC films. The present invention is based on the method of male and female mold clamping and blow hole-assisted forming. When forming is required, the blister material is heated and then conveyed to the forming station. The film is located between the demolding auxiliary template and the female mold. The female mold is buckled on the demolding auxiliary template to ensure the cooperation between the blister forming groove and the blister forming protrusion. During the downward pressing of the female mold, the exhaust component of the female mold discharges the air in the groove. Under the blowing action of the blowing component of the male mold, the blister material is formed along the shape of the blister forming protrusion. Since the downward pressing of the female mold will also press the first elastic member between the male mold and the demolding auxiliary template, and when the female mold is lifted, the first elastic member will also recover, thereby lifting the demolding auxiliary template. At this time, the blister covering the male mold will be demolded when the demolding auxiliary template is lifted.

[0007] The present invention realizes the forming of blisters through the blowing component on the male mold and the shape matching between the male mold and the female mold, and cleverly designs a demolding auxiliary template between the female mold and the male mold to assist in demolding, realizing the forming of blisters of difficult-to-form materials such as polypropylene materials. Moreover, the shape of the blister forming protrusion can be designed according to the shape of the drug for which the blister is formed, which is applicable to the preparation of blisters of various shaped medicaments, achieving a 100% good product rate in blister production and having wide applicability.

[0008] The present invention preferably provides a plastic sheet blister forming mold. The blowing component includes blow holes, the blow holes are located beside the blister forming protrusions, and the blowing direction of the blow holes passes through the through groove. The exhaust component includes exhaust holes, and the exhaust holes are located in the grooves.

[0009] The present invention preferably provides a plastic sheet blister forming mold. The blowing component further includes a blowing air channel, the blowing air channel is communicated with the blow holes, the blowing air channel is located inside the male mold and is supplied with air by a blowing device. The exhaust component further includes an exhaust air channel, the exhaust air channel is communicated with the exhaust holes, the exhaust air channel is located inside the female mold and is communicated with the outside.

[0010] Furthermore, a blow hole is symmetrically arranged on each side of each blister forming protrusion, so that the blister can be evenly formed during blow molding.

[0011] The present invention preferably provides a plastic sheet blister forming mold, and the male mold is further provided with an ice water channel.

[0012] The present invention preferably relates to a plastic sheet blister forming mold. The upper surface of the punch is provided with the blister forming protrusion. Below the blister forming protrusion is provided the air blowing air passage, and below the air blowing air passage is provided the ice water channel.

[0013] The present invention supplies air to the air blowing holes through the air blowing air passage for blow molding, and an ice water channel is provided below the air blowing air passage for cooling the mold.

[0014] The present invention preferably relates to a plastic sheet blister forming mold. A protrusion part is provided in the middle of the punch. The bottom of the die is provided with a concave part matching the protrusion part. A main air blowing air passage penetrating through both ends of the punch is provided in the protrusion part. The main air blowing air passage is vertically communicated with a plurality of auxiliary air blowing air passages. The auxiliary air blowing air passages penetrate through both ends of the punch and are communicated with the air blowing holes.

[0015] The present invention preferably relates to a plastic sheet blister forming mold. The ice water channel is distributed in a circulating coil below the air blowing air passage.

[0016] The present invention preferably relates to a plastic sheet blister forming mold. The first elastic member is a spring.

[0017] The present invention preferably relates to a plastic sheet blister forming mold. The die is provided with a second elastic member, and the second elastic member is located outside the blister forming groove.

[0018] The second elastic member is beneficial for the formed blister attached to the punch to rebound under the action of the second elastic member when the die is released, achieving the purpose of assisting demolding.

[0019] The present invention preferably relates to a plastic sheet blister forming mold. The blister forming protrusion is in the shape of a capsule or a sheet.

[0020] Furthermore, the connection line of the air blowing holes on both sides of the blister forming protrusion evenly divides the blister forming protrusion.

[0021] During the forming process of the present invention, the blister forming protrusion pushes up the blister material to form, and the air blowing holes beside blow air. The blown air will be evenly dispersed in the blister along the middle part of the blister forming protrusion, so that the formability of the blister is better and it is not easily blown out.

[0022] The present invention has the following advantages and beneficial effects:

[0023] 1. The present invention realizes the forming of the blister through the air blowing assembly on the punch and the shape matching of the punch and the die, and cleverly designs a demolding auxiliary template between the die and the punch to assist demolding, realizing the blister forming of difficult-to-form materials, and the qualified product rate reaches 100%.

[0024] 2. The present invention can design the shape of the blister-forming protrusion according to the shape of the drug formed by blister molding, which is applicable to the preparation of blisters for various-shaped medicaments and has a wide range of applications.

[0025] 3. By reasonably designing the positional relationship between the air-blowing air passage and the air-outlet air passage and rapidly reducing the mold temperature through ice-water circulation, the present invention not only achieves a good blow molding effect but also can quickly cool and shape the blister. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0027] Figure 1 is a three-dimensional structural schematic diagram of the male mold of the present invention.

[0028] Figure 2 is a side-view structural schematic diagram of the male mold of the present invention.

[0029] Figure 3 is a structural schematic diagram of the female mold of the present invention.

[0030] Figure 4 is a structural schematic diagram of the groove of the female mold of the present invention.

[0031] Figure 5 is a side-view structural schematic diagram of the female mold removing mold of the present invention.

[0032] Figure 6 is a structural schematic diagram of the demolding auxiliary template of the present invention.

[0033] Figure 7 is a structural schematic diagram of the assembly of the present invention.

[0034] The names of the components in the drawings are as follows:

[0035] 1 - male mold, 2 - demolding auxiliary template, 3 - female mold, 4 - blister-forming protrusion, 5 - first elastic member, 6 - blister-forming groove, 7 - through groove, 8 - air-blowing hole, 9 - air-blowing air passage, 90 - main air-blowing air passage, 91 - auxiliary air-blowing air passage, 10 - exhaust hole, 11 - exhaust air passage, 12 - second elastic member, 13 - ice-water channel, 14 - protrusion part, 15 - concave part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0037] Embodiment 1

[0038] AsFigures 1 to 6 As shown in the figure, a plastic sheet blister forming mold includes a convex mold 1, a concave mold 3, and a demolding auxiliary template 2. The convex mold 1 and the demolding auxiliary template 2 are connected by a first elastic member 5. The first elastic member 5 is a spring. A blister forming protrusion 4 is provided on the convex mold 1. A through groove 7 is provided on the demolding auxiliary template 2. The blister forming protrusion 4 passes through the through groove 7. The concave mold 3 is provided with a blister forming groove 6 that matches the blister forming protrusion 4. A blowing assembly is provided on the convex mold 1, and an exhaust assembly is provided on the concave mold 3.

[0039] The blowing assembly includes a blowing hole 8. The blowing hole 8 is located beside the blister forming protrusion 4, and the blowing direction of the blowing hole 8 passes through the through groove 7. The exhaust assembly includes an exhaust hole 10. The exhaust hole 10 is located in the groove.

[0040] The blowing assembly further includes a blowing air channel 9. The blowing air channel 9 is communicated with the blowing hole 8. The blowing air channel 9 is located inside the convex mold 1 and is supplied with air by a blowing device. The exhaust assembly further includes an exhaust air channel 11. The exhaust air channel 11 is communicated with the exhaust hole 10. The exhaust air channel 11 is located inside the concave mold 3 and is communicated with the outside.

[0041] The upper surface of the convex mold 1 is provided with the blister forming protrusion 4. The blowing air channel 9 is provided below the blister forming protrusion 4. An ice water channel 13 is provided below the blowing air channel 9.

[0042] In the present invention, the blowing air channel 9 supplies air to the blowing hole 8 for blow molding, and the ice water channel 13 is provided below the blowing air channel 9 for cooling the mold. When the mold is cooled, the temperature of the blown gas is also relatively low, so that the molding is faster.

[0043] In the present invention, considering that in the prior art, it is difficult to form some shaped blisters perfectly. If using formed polyvinyl chloride materials, it is not conducive to drug safety. And if improving the equipment, the input cost will be greatly increased. Therefore, the present invention makes improvements on the mold.

[0044] Based on the blow molding method, when forming is required, the blister material is located between the demolding auxiliary template 2 and the concave mold 3. The concave mold 3 is buckled on the demolding auxiliary template 2 to ensure the cooperation of the blister forming groove 6 and the blister forming protrusion 4. During the process of the concave mold 3 pressing down, the exhaust assembly of the concave mold 3 discharges the air in the groove. Under the blowing action of the blowing assembly of the convex mold 1, the blister material is formed along the shape of the blister forming protrusion 4. Since the concave mold 3 pressing down will also press the first elastic member 5 between the convex mold 1 and the demolding auxiliary template 2, and when the concave mold 3 is lifted, the first elastic member 5 will also recover, thereby lifting the demolding auxiliary template 2. At this time, the blister covering the convex mold 1 will be demolded when the demolding auxiliary template 2 is lifted.

[0045] The present invention realizes the forming of the blister through the air blowing component on the punch 1 and the shape matching between the punch 1 and the die 3, and cleverly designs a demoulding auxiliary template 2 between the die 3 and the punch 1 to assist in demoulding, realizing the blister forming of difficult-to-form materials such as polypropylene materials. Moreover, the shape of the blister forming protrusion 4 can be designed according to the shape of the drug formed in the blister, which is applicable to the preparation of blisters for various shapes of medicaments, achieving a 100% yield rate in blister production and having a wide applicability.

[0046] Example 2

[0047] The difference between this example and Example 1 is that the die 3 is provided with a second elastic member 12, and the second elastic member 12 is located outside the blister forming groove 6.

[0048] The second elastic member 12 is conducive to the die 3 rebounding under the action of the second elastic member 12 when the die 3 is released, which is more conducive to demoulding.

[0049] Example 3

[0050] The difference between this example and Example 2 is that the punch 1, the die 3 and the demoulding auxiliary template 2 are all of square structures. Six forming modules are arranged on the bottom film. Each forming module includes 12 blister forming protrusions 4 arranged in six rows and two columns. And the six forming modules are located in the middle position of the punch 1. The periphery of the punch 1 is connected to the demoulding auxiliary template 2 through springs. One air blowing hole 8 is symmetrically arranged on each side of each blister forming protrusion 4, so that the blister can be evenly formed during blow molding.

[0051] A protruding portion is arranged in the middle of the punch 1, and a concave portion matching the protruding portion is arranged at the bottom of the die 3. A main air blowing channel penetrating through both ends of the punch 1 is arranged in the protruding portion. The main air blowing channel is vertically communicated with a plurality of auxiliary air blowing channels. The auxiliary air blowing channels penetrate through both ends of the punch 1 and are communicated with the air blowing holes 8.

[0052] The ice water channel 13 is distributed in a circulating coil shape below the air blowing channel 9.

[0053] The connection line of the air blowing holes on both sides of the blister forming protrusion 4 evenly divides the blister forming protrusion.

[0054] During the forming of the present invention, the blister forming protrusion 4 pushes up the blister material to form, and the air blowing holes beside blow air. The blown air will be evenly dispersed in the blister along the middle part of the blister forming protrusion 4, so that the formability of the blister is better, and the situations of perforation or poor forming are not likely to occur.

[0055] The mold of the present invention can be applied to the forming of capsule-shaped blisters, tablet-shaped blisters, and blisters of other shapes, showing significant advantages for shapes that are difficult to form, and solving a major problem in the field.

[0056] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic sheet blister forming mold, characterized in that, it includes a convex mold (1), a concave mold (3) and a demolding auxiliary template (2). The convex mold (1) and the demolding auxiliary template (2) are connected by a first elastic member (5). A blister forming protrusion is provided on the convex mold (1). A through groove (7) is provided on the demolding auxiliary template (2). The blister forming protrusion (4) passes through the through groove (7). The concave mold (3) is provided with a blister forming groove (6) matching the blister forming protrusion. A blowing assembly is provided on the convex mold (1), and an exhaust assembly is provided on the concave mold (3); The blowing assembly includes a blow hole (8), and the blow hole (8) is located beside the blister forming protrusion (4), and the blowing direction of the blow hole (8) passes through the through groove (7). The exhaust assembly includes an exhaust hole (10), and the exhaust hole (10) is located in the groove; The blowing assembly further includes a blowing air channel (9), and the blowing air channel (9) is communicated with the blow hole (8). The blowing air channel (9) is located inside the convex mold (1) and is supplied with air by a blowing device. The exhaust assembly further includes an exhaust air channel (11), and the exhaust air channel (11) is communicated with the exhaust hole (10). The exhaust air channel (11) is located inside the concave mold (3) and is communicated with the outside. The blister forming protrusion (4) is provided on the upper surface of the convex mold (1).

2. A plastic sheet blister forming mold according to claim 1, characterized in that, the convex mold (1) is further provided with an ice water channel (13).

3. A plastic sheet blister forming mold according to claim 2, characterized in that, the blowing air channel (9) is provided below the blister forming protrusion (4), and the ice water channel (13) is provided below the blowing air channel (9).

4. A plastic sheet blister forming mold according to claim 1, characterized in that, a protruding portion is provided in the middle of the convex mold (1), and a concave portion matching the protruding portion is provided at the bottom of the concave mold (3). A main blowing air channel penetrating both ends of the convex mold (1) is provided in the protruding portion. The main blowing air channel is vertically communicated with a plurality of auxiliary blowing air channels. The auxiliary blowing air channels penetrate both ends of the convex mold (1) and are communicated with the blow holes (8).

5. A plastic sheet blister forming mold according to claim 2, characterized in that, the ice water channel (13) is distributed in a circulating coil below the blowing air channel (9).

6. A plastic sheet blister forming mold according to claim 1, characterized in that, the first elastic member (5) is a spring.

7. A plastic sheet blister forming mold according to claim 1, characterized in that, the concave mold (3) is provided with a second elastic member (12), and the second elastic member (12) is located outside the blister forming groove (6).

8. A plastic sheet blister forming mold according to claim 1, characterized in that, the blister forming protrusion (4) is in a capsule shape or a sheet shape.

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