CN114347393A - Hollow sealing product, injection compression molding die and injection compression molding method - Google Patents
Hollow sealing product, injection compression molding die and injection compression molding method Download PDFInfo
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- CN114347393A CN114347393A CN202210062533.7A CN202210062533A CN114347393A CN 114347393 A CN114347393 A CN 114347393A CN 202210062533 A CN202210062533 A CN 202210062533A CN 114347393 A CN114347393 A CN 114347393A
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Abstract
The invention discloses a hollow sealing product, an injection compression molding die and an injection compression molding method, wherein the injection compression molding die comprises: the die comprises a first die holder and a second die holder, wherein the first die holder and the second die holder are closed to form a die body with a die cavity, and the die cavity is used for forming a hollow sealing product with a sealing film; the fixing column is arranged in the die cavity; the compression assembly is arranged in the die cavity and opposite to the fixing column, a gap used for forming the sealing film is formed between the compression assembly and the fixing column, and the compression assembly can slide relative to the fixing column to compress the sealing film. The invention adopts a local pressurization mode, when the die body is completely in a closed state, when the melt injected into the die cavity shrinks due to cooling, the sealing film is further compressed inwards by the compression assembly, so that the sealing film is compressed and thinned, and the shrinkage part is compensated, thereby ensuring the dimensional accuracy of the product.
Description
Technical Field
The invention relates to the technical field of sealing products, in particular to a hollow sealing product, an injection compression molding die and an injection compression molding method.
Background
Due to the limitation of the polymer material characteristics of plastics, the thin-walled product is relatively difficult to manufacture, and the direct use of injection molding for thin-walled products with complex shapes or products with high performance requirements is easy to generate defects such as large residual stress, shrinkage, warpage and the like.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention aims to provide a hollow sealing product, an injection compression molding die and an injection compression molding method.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, an injection compression molding mold is provided, comprising:
the die comprises a first die holder and a second die holder, wherein the first die holder and the second die holder are closed to form a die body with a die cavity, and the die cavity is used for forming a hollow sealing product with a sealing film;
the fixing column is arranged in the die cavity;
the compression assembly is located in the die cavity and arranged opposite to the fixing column, a gap used for forming the sealing film is formed between the compression assembly and the fixing column, and the compression assembly can slide relative to the fixing column to compress the sealing film.
Further, the compression assembly includes a platen and a compression column; the pressing plate is arranged in the die body, the compression column penetrates through the pressing plate and then is arranged opposite to the fixed column along the gap, and the compression column can slide relative to the fixed column.
Further, the top and the bottom of the die cavity are both provided with thread grooves.
In a second aspect, there is provided an injection compression molding method using the injection compression molding die of the first aspect, including the steps of:
(1) closing the first die holder and the second die holder to obtain a die body with a die cavity;
(2) respectively arranging the compression assembly and the fixed column in a die cavity, and reserving a gap for forming a sealing film between the compression assembly and the fixed column;
(3) injecting a melt for manufacturing a hollow sealing product into the mold cavity to obtain the hollow sealing product with a sealing film with an initial thickness; wherein, the injection temperature is 190 ℃ and 240 ℃, the injection pressure is 700 and 1000bar, and the pressure maintaining pressure is 560 and 800 bar;
(4) after the injection is finished, moving the compression assembly after delaying for 0.15-0.35S, and enabling the compression assembly to extrude the sealing film to obtain a hollow sealing product with the sealing film with the target thickness; wherein the compression pressure of the compression assembly is 80-200 bar.
Preferably, the compression assembly has a compression pressure of 150 bar.
In the invention, the forming die can be matched with the existing injection compression forming equipment for use; specifically, the injection operation of the step (3) can be realized by an oil cylinder of the injection compression molding equipment; the compression operation in the step (4) can push the compression column to extrude the sealing film through an oil cylinder or other compression pieces of the injection compression molding equipment, and the sealing film is extruded to immediately compensate the contraction part of the sealing film.
In a third aspect, there is provided a hollow sealing article produced by the injection-compression molding die of the first aspect or the injection-compression molding method of the second aspect, the hollow sealing article having a sealing film.
Further, the sealing film is located on the top, inside or bottom of the hollow sealing article.
Further, the thickness of the sealing film is 0.1-2 mm.
Preferably, the sealing film has a thickness of 0.3 to 0.5 mm.
Further, the sealing film and the hollow sealing article are of an integrally molded structure.
Further, the top and bottom of the hollow sealing article are both provided with threads.
In a fourth aspect, there is provided the use of the hollow sealing article of the third aspect in sealing a packaged product.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a local pressurization mode, when the die body is completely in a closed state, when a melt injected into the die cavity shrinks due to cooling, pressure is directly applied from the outside, the sealing film is further compressed inwards through the compression component, and the sealing film is compressed and thinned, so that the shrinkage part is immediately compensated, the dimensional precision of the thin-wall product is ensured, and the molecular orientation, the internal stress and the residual stress generated by pressure maintaining are reduced or eliminated. Compared with the mode of directly performing one-step injection molding to obtain a film with a target thickness, the invention has larger cavity space for receiving injected melt, and has smaller flow resistance of injection and smaller required injection pressure and mold locking force.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is an assembly view of an injection compression molding die in example 1;
FIG. 2 is a sectional view of an injection compression molding die in example 1;
FIG. 3 is a schematic view of the structure of a sealed hollow article according to example 1.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a first die holder; 2. a second die holder; 3. a mold body; 4. a mold cavity; 5. fixing a column; 6. a compression assembly; 61. pressing a plate; 62. compressing the column; 7. a thread groove; 8. a hollow sealed article; 9. sealing the film; 10. and (4) threading.
Detailed Description
For a fuller understanding of the technical aspects of the present invention, reference should be made to the following detailed description taken together with the accompanying drawings; it is to be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, do not refer to the orientation or positional relationship shown in the drawings, but merely serve to facilitate the description of the present usage confidence and simplify the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used to distinguish between different elements, etc., and do not denote a sequential order, nor do the terms "first" and "second" define different types.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 3, the injection-compression molding die of the present embodiment is used for preparing a hollow sealing article 8 having a sealing film 9, and the molding die includes:
the die comprises a first die holder 1 and a second die holder 2, wherein the first die holder 1 and the second die holder 2 are closed to form a die body 3 with a die cavity 4, and the die cavity 4 is used for forming a hollow sealing product 8 with a sealing film 9;
the fixing column 5 is arranged in the die cavity 4;
the compression assembly 6 is arranged in the die cavity 4 and opposite to the fixed column 5, a gap for forming the sealing film 9 is formed between the compression assembly 6 and the fixed column 5, and the compression assembly 6 can slide relative to the fixed column 5 to compress the sealing film 9.
Based on the above structure, in the preparation process of the hollow sealing product 8, the following steps can be adopted:
(1) closing the first die holder 1 and the second die holder 2 to obtain a die body 3 with a die cavity 4;
(2) arranging the compression assembly 6 and the fixed column 5 in the die cavity 4 oppositely, and reserving a gap for forming a sealing film 9 between the compression assembly 6 and the fixed column 5;
apply the forming die who assembles to injection moulding compression equipment in, realize subsequent injection and compression operation through injection moulding compression equipment, specifically do:
(3) injecting a melt for manufacturing the hollow sealing product 8 into the die cavity 4 through an oil cylinder of the injection molding compression device to obtain the hollow sealing product 8 with a sealing film 9 with an initial thickness; wherein the injection temperature is 200 ℃, the injection pressure is 850bar, and the holding pressure is 680 bar;
in this embodiment, the melt is PE or PP material;
wherein the sealing film 9 is formed in the gap between the compressing assembly 6 and the fixing post 5, but the sealing film 9 is shrunk by cooling during the cooling of the melt; based on the above problem, the present embodiment further adopts the following steps:
(4) after the injection is finished, moving the compression assembly 6 after delaying 0.25S, and pushing the compression assembly 6 through a control oil cylinder or other compression pieces to enable the compression assembly 6 to extrude the sealing film 9, so as to obtain a hollow sealing product 8 with the sealing film 9 with the target thickness; wherein the compression assembly has a compression pressure of 150 bar.
In the step (4), after 0.25S, the compression assembly 6 is controlled to extrude the sealing film 9, so that the melt is tightly attached to the inner part of the mold cavity to obtain a precise shape and provide primary supplementary cooling shrinkage under the action of short pressure maintaining; along with compression subassembly 6 along fixed column 5 direction compression, compression subassembly 6 can exert pressure to sealing film 9, and the fuse-element of sealing film 9 department is compressed tightly by compression subassembly 6 compaction, can compensate the size shrink that the fuse-element cooling caused immediately, reduces or eliminates molecular orientation and internal stress and the residual stress that the pressurize produced simultaneously for sealing film 9 department pressure distribution is even, effectively reduces sealing article residual stress simultaneously, reduces sealing article shrink unevenness.
In this embodiment, the delay time in step (4) is preferably 0.15 to 0.35S.
In this embodiment, the conditions for the injection process may also be: the injection temperature is 190-240 ℃, the injection pressure is 700-1000bar, and the pressure maintaining pressure is 560-800 bar; however, it should be noted that the holding pressure is usually about 80% of the injection pressure, so as to avoid the problem of large residual stress of the sealed product due to too high holding pressure.
Further, in the present embodiment, as shown in fig. 1-2, the compressing assembly 6 includes a pressing plate 61 and a compressing column 62; the pressing plate 61 is arranged in the die body 3, the compression column 62 penetrates through the pressing plate 61 and then is arranged opposite to the fixed column 5 along the gap, and the compression column 62 can slide relative to the fixed column 5.
Specifically, in the injection molding process of the sealed product, the compression column 62 can be fixed through the pressure plate 61 so as to enable the compression column 62 to be in a stable state temporarily, and further, it can be ensured that the relative position of the compression column 62 and the fixing column 5 is not changed in the early stage of the injection molding production of the sealed product, so that the integrity of the sealed product is ensured; after obtaining the hollow sealing product 8 with the sealing film 9 with the initial thickness, by moving the compression column 62, the compression column 62 moves along the fixed column 5 direction relative to the mold body 3 and the pressing plate 61, and applies pressure to the sealing film 9, the melt at the sealing film 9 is compacted by the compression assembly 6, thereby realizing the adjustment of the thickness of the sealing film 9.
In particular, in this embodiment, the sealing film 9 may be located on the top, inside or bottom of the hollow sealing article 8. The position of the sealing film 9 on the hollow sealing product 8 can be adjusted by adjusting the positions of the compression column 62 and the fixing column 5.
Specifically, the thickness of the sealing film 9 is 0.1 to 2 mm. Preferably, the thickness of the sealing film 9 is 0.3 to 0.5 mm. The specific thickness of the sealing film 9 can be adapted according to the requirements of the sealing effect and the force required to puncture the sealing film 9.
The invention adopts an integrated injection compression molding method, and the prepared hollow sealing product 8 and the sealing film 9 are made of the same material and are convenient to recycle; compared with the mode of directly obtaining the thin film with the target thickness by one-step injection molding, the invention has larger cavity 4 space for receiving injected melt, smaller flow resistance during injection and smaller required injection pressure and mold locking force.
The sealing film 9 prepared by the invention is more uniform and flat, has more stable size, avoids the defects that the sealing film 9 formed by direct injection molding is easy to generate large residual stress, shrinkage, warping and the like, has higher sealing performance and more stable production process. Meanwhile, the sealing film 9 obtained by compression molding of the compression component 6 can reduce or eliminate molecular orientation, internal stress and residual stress generated by filling and pressure maintaining, the sealing film 9 is more uniform and firmer, and when a user directly punctures the sealing film, no fragments are generated, so that the risk of blocking or generating foreign matters is avoided.
The sealing product and the sealing film 9 manufactured by the invention are of an integrally formed structure, and have better sealing performance.
Further, as shown in fig. 1, the top and the bottom of the mold cavity 4 are both provided with thread grooves 7, as shown in fig. 3, the top and the bottom of the prepared hollow sealed product 8 are both provided with threads 10, and the hollow sealed product can be directly installed on a packaged product and connected with a sealing member (such as a sealing cap of the packaged product) through the threads 10 at the two ends in subsequent application without additionally installing other connecting members, so that the working efficiency can be effectively improved, and the problem of poor sealing performance caused by the installation of other connecting members can be avoided.
Example 2
The embodiment provides an injection soft bag, which includes a soft bag body and a hollow sealing product 8 prepared by the injection compression molding mold described in embodiment 1, specifically, a thread 10 at the bottom of the hollow sealing product 8 is connected with a thread 10 at the top of the soft bag body, and the hollow sealing product 8 and the sealing film 9 realize double sealing of the soft bag body and the injection in the soft bag body.
Based on the structure, in the specific using process, when the infusion is prepared, the puncture needle and the nut are taken and assembled in sequence, the puncture needle penetrates through the sealing film 9 at the center of the interface along with the continuous inward screwing of the puncture needle base along the thread 10 at the top of the hollow sealing product 8, and the injection can be introduced into the infusion tube through the puncture needle. Because the sealing product and the sealing film 9 are of an integrated structure, except for the position punctured by the puncture needle on the sealing film 9 for the injection liquid to flow through, the joint of the sealing film 9 and the sealing product has better sealing performance.
Example 3
The embodiment provides a soft beverage bag, which comprises a soft bag body and a hollow sealing product 8 prepared by the injection compression molding die in embodiment 1, specifically, a thread 10 at the bottom of the hollow sealing product 8 is connected with a thread 10 at the top of the soft bag body, and the hollow sealing product 8 and a sealing film 9 realize double sealing of the soft bag body and the beverage in the soft bag body.
Based on the structure, when in use, the sealing film 9 is pushed through by force by one end of the oblique opening of the hard straw, and the beverage in the straw can be sucked out.
Compared with the mode that hard plastics and soft rubber which has the sealing function are assembled together at present on the market, the soft rubber (such as silica gel, thermoplastic elastomer TPE and the like) has the sealing function, or the mode of sealing by adopting the heat-sealing aluminum foil mode is adopted, the invention does not need to additionally use the heat-sealing aluminum foil or the soft rubber, has excellent sealing performance, and can also avoid the situation that the sealing film 9 is directly cracked when the sealing film 9 is punctured; in the soft drink bag of the embodiment, the sealing film 9 is not punctured, so that fragments are not generated, and foreign matters are prevented from being generated or the straw is prevented from being blocked.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (10)
1. An injection compression molding die, comprising:
the die comprises a first die holder and a second die holder, wherein the first die holder and the second die holder are closed to form a die body with a die cavity, and the die cavity is used for forming a hollow sealing product with a sealing film;
the fixing column is arranged in the die cavity;
the compression assembly is located in the die cavity and arranged opposite to the fixing column, a gap used for forming the sealing film is formed between the compression assembly and the fixing column, and the compression assembly can slide relative to the fixing column to compress the sealing film.
2. The injection compression molding mold of claim 1, wherein the compression assembly comprises a platen and a compression post; the pressing plate is arranged in the die body, the compression column penetrates through the pressing plate and then is arranged opposite to the fixed column along the gap, and the compression column can slide relative to the fixed column.
3. The injection compression molding mold of claim 1, wherein the top and bottom of the mold cavity are each provided with a threaded groove.
4. An injection compression molding method using the injection compression molding die according to any one of claims 1 to 3, characterized by comprising the steps of:
(1) closing the first die holder and the second die holder to obtain a die body with a die cavity;
(2) respectively arranging the compression assembly and the fixed column in a die cavity, and reserving a gap for forming a sealing film between the compression assembly and the fixed column;
(3) injecting a melt for manufacturing a hollow sealing product into the mold cavity to obtain the hollow sealing product with a sealing film with an initial thickness; wherein, the injection temperature is 190 ℃ and 240 ℃, the injection pressure is 700 and 1000bar, and the pressure maintaining pressure is 560 and 800 bar;
(4) after the injection is finished, moving the compression assembly after delaying for 0.15-0.35S, and enabling the compression assembly to extrude the sealing film to obtain a hollow sealing product with the sealing film with the target thickness; wherein the compression pressure of the compression assembly is 80-200 bar.
5. An injection compression molding method according to claim 4, wherein in step (4), the compression assembly is pressed at a pressing pressure of 150 bar.
6. A hollow sealed article characterized by being produced by the injection compression molding die according to any one of claims 1 to 3 or the injection compression molding method according to claim 4 or 5, and having a sealing film.
7. The hollow sealed article of claim 6, wherein said sealing membrane is located on the top, inside or bottom of said hollow sealed article.
8. The hollow sealed article of claim 6, wherein said sealing film has a thickness of 0.1-2 mm.
9. The hollow sealed article of claim 6 wherein both the top and bottom of the hollow sealed article are provided with threads.
10. Use of a hollow sealed article according to any of claims 6 to 9 in sealing a packaged product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062533.7A CN114347393A (en) | 2022-01-19 | 2022-01-19 | Hollow sealing product, injection compression molding die and injection compression molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062533.7A CN114347393A (en) | 2022-01-19 | 2022-01-19 | Hollow sealing product, injection compression molding die and injection compression molding method |
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| CN114347393A true CN114347393A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210062533.7A Pending CN114347393A (en) | 2022-01-19 | 2022-01-19 | Hollow sealing product, injection compression molding die and injection compression molding method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794883A (en) * | 2012-09-14 | 2012-11-28 | 四川省隆鑫科技包装有限公司 | Bottle cap injection mold and bottle cap injection molding method |
| CN107756733A (en) * | 2017-09-11 | 2018-03-06 | 广东工业大学 | A kind of plastic injection compression precise forming mold and technique |
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2022
- 2022-01-19 CN CN202210062533.7A patent/CN114347393A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794883A (en) * | 2012-09-14 | 2012-11-28 | 四川省隆鑫科技包装有限公司 | Bottle cap injection mold and bottle cap injection molding method |
| CN107756733A (en) * | 2017-09-11 | 2018-03-06 | 广东工业大学 | A kind of plastic injection compression precise forming mold and technique |
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