CN114734612B

CN114734612B - Medicine bottle extrusion and blowing integrated forming process

Info

Publication number: CN114734612B
Application number: CN202210231920.9A
Authority: CN
Inventors: 金意明; 瞿祥鹏; 瞿呈鹏
Original assignee: Huzhou Weinuo Pharmaceutical Packaging Co ltd
Current assignee: Huzhou Weinuo Pharmaceutical Packaging Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2024-01-23
Anticipated expiration: 2042-03-10
Also published as: CN114734612A

Abstract

The invention relates to a medicine bottle extrusion-blowing integrated forming process, which comprises the following steps: a preform blow molding step in which the molding die synchronously moves the preform molded by the molding die to a position below an air needle for introducing air into the preform through an air medium and blow molding the preform in the molding die; an opening of the preform is arranged right below the corresponding air needle; the air needle moves downwards, the upper end part of the opening is filled with the supplementary material, the opening is tightly attached to the air needle, and a bottle opening is formed between the air needle and the forming die; the invention solves the technical problems that in the actual blow molding process, the inner wall of the bottle opening still has the flowing problem, so that the thickness of the bottle opening is only thinner and thinner, and the quality of the bottle opening of the bottle is poor.

Description

Medicine bottle extrusion and blowing integrated forming process

Technical Field

The invention relates to the technical field of medical medicine bottle blow molding, in particular to a medicine bottle extrusion and blow molding integrated molding process.

Background

When the bottle blowing machine stretches and blows bottles, the end socket presses the supporting ring of the bottle mouth and provides sealing for the bottle blowing process through the end socket assembly, the end socket assembly comprises a blowing nozzle and a pressing sleeve, the blowing nozzle and the pressing sleeve are made of stainless steel materials, and the whole bottle blowing machine is heavy and has low return speed; the shape of the blowing nozzle is complex, the processing difficulty is high, and when the bottle mouth is sealed, the blowing nozzle needs to be inserted into the bottle mouth, and the bottle mouth is possibly scratched; the bottle mouth with slightly poor centering in operation can be blocked in the seal head, so that the bottle taking is abnormal.

Patent document CN 203945666U discloses a head device of bottle blowing machine, including the cover establish at the bottleneck and be used for pushing down the head of the holding ring of bottleneck, be used for sealing the sealing member of bottleneck, be used for compressing tightly the sealing member of head and sealing member, the sealing member is including sealing the sealing pad of sealing pressure at the bottleneck, the cover is established at the sealing pad outside seal cover, the tip of seal cover with the head counterbalance tightly, the sealing member cover is established outside head and seal cover.

However, in the actual use process, the inventor finds that in the actual blow molding process, the problem of flow still exists on the inner wall of the bottle mouth, so that the problem that the bottle mouth thickness is only thinner and the bottle mouth quality of the bottle is poor is caused.

Disclosure of Invention

The invention aims at overcoming the defects of the prior art, by arranging a bottle blank extrusion process to be more abundant than the traditional material extrusion process, further arranging redundant raw materials above a die, pushing the supplementary materials above a bottle mouth into the bottle mouth of the bottle blank by utilizing a bottle blank blow molding process, further increasing the thickness of the bottle mouth after the bottle blank is molded, and integrating the raw materials of a thickened part and the bottle blank before molding into a whole, ensuring the smooth and full inner wall of the bottle mouth, thereby solving the technical problems that the inner wall of the bottle mouth still has flow problems in the actual blow molding process, further leading to the fact that the bottle mouth thickness is only thinner and the bottle mouth quality of the bottle is poor.

Aiming at the technical problems, the technical scheme is as follows: an integrated extrusion and blowing process for a medicine bottle, comprising:

a preform blow molding step in which the molding die synchronously moves the preform molded by the molding die to a position below an air needle for introducing air into the preform through an air medium and blow molding the preform in the molding die; an opening of the preform is arranged right below the corresponding air needle;

the air needle moves downwards to fill the upper end part of the opening with the supplementary material, the opening is tightly attached to the air needle, and a bottle opening is formed between the air needle and the forming die.

Preferably, the air needle moves downwards, and the air medium continuously charges and impacts the feed material at the upper end part of the opening to enable the feed material to flow to the opening.

Preferably, when the molding die is closed to mold the preform, the excess raw material of the preform is temporarily stored above the molding die to form the supplementary material.

Preferably, the method further comprises a preform extrusion step of molding the preform by clamping the raw material extruded from the extruder 1 with a molding die located therebelow before in the preform blow molding step.

Preferably, the method further comprises a cooling procedure, wherein the forming die is reset after being opened, the next preform is to be formed, meanwhile, the bottle preform after blow molding is demoulded and is tightly sleeved on the air needle, and the bottle preform is clamped, transferred and output by a clamping mechanism of a cooling station.

Preferably, when the molding die is closed, the clamping mechanism synchronously clamps the bottle blank after demolding, the air needle is reset, and the bottle blank blowing process is repeated.

Preferably, the air needle is provided with a sealing part for sealing the opening of the preform when the bottle mouth is formed, a forming part matched with one opening of the preform, and a guiding part extending into the preform in sequence along the length direction.

Preferably, when the bottle blank is molded in the blow molding process, the outer wall of the air needle is completely attached to the inner wall of the bottle mouth, and the part of the molded part, which is completely attached to the inner wall of the bottle mouth, is downwards extended to the bottom of the bottle mouth.

Preferably, the length dimension of the molding part is not smaller than the length dimension of the bottle mouth.

Preferably, the bottle blank blow molding station and the cooling station are linearly arranged and are respectively provided with two groups, and the two groups are respectively matched with the extruder to alternately work.

Preferably, a bottle body groove and a bottle mouth groove which are communicated are formed in the die cavity of the forming die, the bottle mouth groove is of a threaded structure, and the opening is formed in the bottle mouth groove to form the bottle mouth.

The invention has the beneficial effects that:

(1) According to the invention, the bottle blank extrusion process is more full than the traditional material extrusion process, so that redundant raw materials are placed above a die, and the bottle blank blow molding process is utilized to push the supplementary materials above the opening into the opening, so that the thickness of the bottle opening can be continuously increased after the bottle opening is molded, the raw materials of the thickened part and the preformed blank before molding are fused into a whole, the inner wall of the bottle opening is ensured to be smooth and full, and the product quality is improved;

(2) According to the invention, the outer wall of the air needle is completely and tightly abutted against the inner wall of the bottle mouth, and the abutting part of the air needle and the inner wall of the bottle mouth is downwards extended to the bottom of the bottle mouth, so that the air needle fills the material into the inner wall of the bottle mouth to form a new inner wall, and further, in the forming process of an external screw port of the bottle mouth, uneven welding marks are not easy to appear on the inner wall of the bottle mouth due to the structure of the external screw thread, so that the air needle filled in the inner wall of the bottle mouth is combined, the inner wall of the bottle mouth is smooth and even, and meanwhile, in the later sealing process, the bottle mouth is not twisted off at a cold welding position due to external power of a machine, and the defective rate of products is reduced;

(3) According to the invention, the forming part is arranged until the forming part extends into the bottom end of the bottle mouth, so that the bottle mouth is extruded inwards by the bottle mouth combined with the threaded port of the die after supplementing the material by using the forming part, the bottle mouth is stressed evenly, the thickness of the bottle mouth is equal everywhere from top to bottom, and the product quality is improved; on the other hand, as the forming part is in interference contact with the inner wall of the bottle mouth for supplementing the material after supplementing, raw materials are extruded to fall to the bottom of the bottle mouth in the blowing process, so that the contact part between the bottle mouth and the bottle body is firmer, and operators are not easy to unscrew the whole bottle mouth in the actual use process, thus prolonging the service life of products;

(4) According to the invention, the air needle is arranged to blow downwards synchronously in the downward moving process, so that on one hand, the air needle is convenient to erect after the supplement material pulled above the die is stressed, and further the air needle is convenient to insert quickly, on the other hand, the air needle is used to blow downwards, the supplement material positioned on the inner wall part is moved downwards to be piled on the upper end of the bottle mouth, and further the air needle is convenient to push the supplement material to the blank in the inserting process, so that the bottle mouth after one-step molding can be thickened and plump in the blowing process.

In conclusion, the device has the advantages of simple structure and wall thickness of the bottle mouth, and is particularly suitable for the technical field of medicine bottle blow molding.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings described below are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic flow chart of an integral molding process of extrusion blow molding of a medical vial.

Fig. 2 is a state diagram of the first embodiment.

Fig. 3 is an enlarged partial schematic view of fig. 2 at a.

Fig. 4 is a state diagram of the first embodiment.

Fig. 5 is a schematic structural diagram of the second embodiment.

Fig. 6 is a schematic structural diagram of a second embodiment.

Fig. 7 is a schematic structural view of the mold.

Fig. 8 is a schematic diagram showing a molding state of the preform blowing process.

Fig. 9 is a second schematic diagram showing a molding state of the preform blowing process.

Fig. 10 is a third schematic diagram showing a molding state of the preform blowing process.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings.

Example 1

As shown in fig. 1 to 3, a process for extrusion-blowing an integrated medicine bottle includes:

a preform blowing step in which the molding die 21 moves the preform 100 molded by the molding die to a position below the air needle 41 adapted to blow-mold the preform 100 through the air medium; an opening 200 of the preform 100 is positioned directly below the corresponding air needle;

the air needle 41 moves downward to fill the opening 200 with the material 400 at the upper end of the opening 200, the opening 200 is closely attached to the air needle 41, and the bottle mouth 300 is formed between the air needle 41 and the molding die 4.

Compared with the traditional extrusion process, in the embodiment, the bottle blank extrusion process is more full than the traditional extrusion process, and then redundant raw materials are placed above the die 21, and then the bottle blank blow molding process is utilized to push the material supplement 400 above the opening 200 into the opening 200, so that the thickness of the bottle mouth 300 can be continuously increased after the bottle mouth 300 is molded, and the raw materials of the thickened part and the preformed blank 100 before molding are fused into a whole, so that the smoothness and plumpness of the inner wall of the bottle mouth 300 are ensured, and the product quality is improved.

In this embodiment, through setting up the air needle 41 outer wall and closely support completely and lean on the feed 400 inner wall of opening 200 and this air needle 41 and feed 400 inner wall support and extend to bottleneck 300 bottom down, make air needle 41 with feed 400 fill to bottleneck inner wall and form new inner wall, and then the external screw thread of bottleneck is in the shaping in-process, be difficult for because the structure of external screw thread leads to the uneven weld mark to appear in bottleneck 300 inner wall, thereby combine filling at bottleneck 300 inner wall air needle 41, in the later stage sealing process when making bottleneck inner wall smooth and flat, can not twist the bottleneck off in cold junction because of the external power of machine, reduce the defective percentage of product.

Further, as shown in fig. 4, the air needle 41 moves downward, and the air medium continuously charges the feed 400 at the upper end of the opening 200 to flow toward the opening 200.

Further, as shown in fig. 4, when the molding die 21 is closed to mold the preform 100, the excess raw material of the preform 100 is temporarily stored above the molding die 21 to form the feed 400.

Further, as shown in fig. 5, the preform extrusion step is further included, and the preform 100 is molded by closing the mold 21 located below the raw material 3 extruded by the extruder 1 before the preform blowing step.

Further, in the preform blowing process, the extrusion temperature of the raw material 3 is 130-160 ℃.

Further, in the bottle blank blow molding process, the temperature of the raw material 3 in the blow molding process is 110-140 ℃.

Further, in the bottle blank blow molding process, the blow molding and cooling time is 40-50s.

Further, as shown in fig. 4, in the preform blowing process, when the air needle 41 starts to move downward, the air needle 41 blows downward simultaneously.

In this embodiment, through setting up the synchronous downward blowing of gas needle 41 from the downshift in-process, be convenient for on the one hand with the expansion from inside to outside after the supplementary material atress of drooping in mould 21 top erects, and then do benefit to gas needle 41 and insert fast, on the other hand utilizes gas needle 41 to blow downwards, moves down the supplementary material that is located the inner wall part to pile up at the bottleneck upper end, and then do benefit to the propelling movement to the embryo material that gas needle 41 inserts the in-process with the supplementary material 400 fills, the bottleneck after the one shot forming still can thicken at the blowing in-process, full effect is reached.

Example two

As shown in fig. 4 to 7, wherein the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, only the differences from the first embodiment will be described below for the sake of brevity. The second embodiment is different from the first embodiment in that:

further, as shown in fig. 6, the method further comprises a cooling step, wherein the molding die 21 is reset after being opened, the next preform 100 is to be molded, and at the same time, the blow-molded bottle preform 500 is demolded and tightly sleeved on the air needle 41, and is clamped, transferred and output by the clamping mechanism 5 of the cooling station.

Further, as shown in fig. 4, when the molding die 21 is closed, the clamping mechanism 5 simultaneously clamps the bottle preform 500 after the demolding, the air needle 41 is reset, and the bottle preform blowing process is repeated.

Further, as shown in fig. 4, the air needle 41 is provided with a sealing portion 411 for sealing the opening 200 of the preform 100 when the bottle mouth 300 is formed, a forming portion 412 for fitting one opening 200 of the preform 100, and a guide portion 413 extending into the preform 100 in this order along the longitudinal direction thereof.

The shaft diameter of the air needle 41 gradually decreases from the sealing portion 411 to the guide portion 413.

Further, as shown in fig. 4, the outer surface of the molding portion 412 is a smooth surface and is configured to match the structure of the inner wall of the bottle mouth 300.

In this embodiment, by arranging the forming part 412 until the forming part 412 extends into the bottom end of the bottle mouth, on one hand, the bottle mouth 300 of the fed material 400 is extruded outwards by the forming part 412 and combined with the threaded opening of the die to extrude the bottle mouth 300 inwards, so that the stress of the bottle mouth 300 is even, the thickness of the bottle mouth 300 is equal everywhere from top to bottom, and the product quality is improved; on the other hand, because the forming part 412 is in interference contact with the inner wall of the bottle mouth 300 of the supplementary material 400, raw materials are extruded to fall to the bottom of the bottle mouth 300 in the blowing process, and then the contact part between the bottle mouth 300 and the bottle body is firmer, and in the actual use process, operators are not easy to unscrew the whole bottle mouth 300, so that the service life of products is prolonged.

The forming portion 412 has a gap with the inner wall of the bottle mouth, and the gap is filled by the material supplement along the lower edge of the inner wall of the bottle mouth.

In addition, from the sealing part 411 to the guiding part 413, the shaft diameter of the air needle 41 is gradually reduced, so that the air needle is rapidly inserted in the process of inserting the bottle preform.

It should be noted that the area of the lower end surface of the sealing portion 411 is larger than the area of the upper end surface of the bottle mouth 300, and the molding portion 412 is combined with the inner wall of the bottle mouth of the post-supplement material 302 to seal the bottle mouth, so as to prevent the air leakage phenomenon caused by insufficient air pressure and failure molding when the machine blows into the bottle blank.

Further, when the preform is molded in the preform blowing process, the outer wall of the air needle 41 is completely adhered to the inner wall of the bottle mouth 300, and the portion of the molded portion 412 completely adhered to the inner wall of the bottle mouth 300 is extended down to the bottom of the bottle mouth 300.

Further, the length of the molding portion 412 is not smaller than the length of the bottle mouth 300.

Further, two groups of bottle blank blow molding stations and two groups of cooling stations are arranged in a linear arrangement mode and are respectively matched with the extruder 1 to work alternately.

Further, a bottle body groove 201 and a bottle mouth groove 202 are formed in the cavity 20 of the forming mold 21, the bottle mouth groove 202 is in a threaded structure, and the opening 200 is formed in the bottle mouth groove 202 to form the bottle mouth 300.

The working process comprises the following steps:

firstly, extruding raw materials by an extruder 1, when the raw materials are extruded to a preset length, moving any die 21 to be positioned below the extruder 1, closing the die 21, extending a cutter below the extruder 1, cutting off the raw materials on the extruder 1, and driving the cut raw materials to move to the lower side of a corresponding blow molding machine 4 by a molding mechanism 2;

then, when the air needle 41 starts to move downwards, the air needle 41 synchronously blows downwards, the air needle 41 inserts the supplementary material into the bottle mouth in the mould 21, the guide part of the air needle 41 is fully inserted into the bottle body, the air needle 41 stops moving to blow and cool the bottle blanks, the clamping mechanism 5 moves reversely, the mould 21 is opened, the bottle blanks are hung on the air needle 41, the other mould 21 finishes receiving and transferring, the mould 21 on the other side moves inwards to perform material taking, the clamping mechanism 5 moves towards each other to finish clamping the bottle blanks when the mould 21 is closed, the air needle 41 moves upwards to reset, the bottle blanks are positioned between the two groups of clamping mechanisms 5, and when the bottle blanks of the next group are opened, the bottle blanks of the next group automatically fall onto a lower conveying track to finish automatic output, and then the forming of the bottle blanks of the group is finished.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "front and rear", "left and right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or component in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

Of course, in this disclosure, those skilled in the art will understand that the term "a" or "an" is to be interpreted as "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, and in another embodiment, the number of elements may be multiple, and the term "a" is not to be construed as limiting the number.

The foregoing is merely a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art under the technical teaching of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. The extrusion and blowing integrated molding process for the medicine bottle is characterized by comprising the following steps of:

a preform blowing step in which the molding die (21) moves the preform (100) molded by the molding die synchronously to a position below a gas needle (41) adapted to blow-mold the preform (100) through a gas medium while introducing gas into the preform (100); -an opening (200) of said preform (100) is placed directly under the corresponding air needle (41);

the air needle (41) moves downwards, air medium performs air inlet impact on the feed supplement (400) at the upper end part of the opening (200) to enable the feed supplement to flow to the opening (200), the feed supplement (400) at the upper end part of the opening (200) is filled into the opening (200), the opening (200) is tightly attached to the air needle (41), and a bottle mouth (300) is formed between the air needle (41) and the forming die (21);

when the molding die (21) is used for clamping and molding the preform (100), redundant raw materials of the preform (100) are temporarily stored above the molding die (21) to form the feeding material (400).

2. The process of claim 1, wherein the gas medium continuously impacts the feed (400).

3. The process according to claim 1, further comprising a preform extrusion process, wherein the preform (100) is molded by closing the mold (21) located therebelow with the raw material (3) extruded by the extruder (1) before the preform blowing process.

4. A process for extrusion-blowing a pharmaceutical vial according to any one of claims 1 to 3, further comprising a cooling step, wherein the molding die (21) is reset after being opened to mold the next preform (100), and at the same time, the blow-molded preform (500) is released from the mold and tightly sleeved on the air needle (41), and is clamped, transferred and output by the clamping mechanism (5) of the cooling step.

5. The process according to claim 4, wherein the clamping mechanism (5) simultaneously clamps the bottle blank (500) after demolding when the molding die (21) is closed, and the air needle (41) is reset, so that the bottle blank blowing process is repeated.

6. A process for integrally extrusion-blowing a pharmaceutical vial according to any one of claims 1-3, characterized in that the air needle (41) is provided with, in sequence along its length, a sealing portion (411) for sealing the opening (200) of the preform (100) when the vial mouth (300) is formed, a forming portion (412) adapted to one opening (200) of the preform (100), and a guiding portion (413) extending into the interior of the preform (100).

7. The process according to claim 6, wherein the outer wall of the air needle (41) is completely adhered to the inner wall of the bottle mouth (300) and the portion of the molding part (412) completely adhered to the inner wall of the bottle mouth (300) is downward extended to the bottom of the bottle mouth (300) during the molding in the preform blowing process.

8. The process of claim 7, wherein the length of the molding portion (412) is not smaller than the length of the mouth (300).

9. A process for integrally extrusion-blowing a pharmaceutical vial according to claim 3, characterized in that the linear arrangement of the parison blowing station and the cooling station is provided with two groups, respectively cooperating with the extruder (1) in alternation.

10. A process for extrusion-blowing a medicine bottle according to any one of claims 1-3, wherein a bottle body groove (201) and a bottle mouth groove (202) which are communicated are formed in a die cavity (20) of the forming die (21), the bottle mouth groove (202) is in a threaded structure, and the opening (200) is formed in the bottle mouth groove (202) to form the bottle mouth (300).