CN114889976B - Bottle cap and forming method thereof - Google Patents

Bottle cap and forming method thereof Download PDF

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Publication number
CN114889976B
CN114889976B CN202210822921.0A CN202210822921A CN114889976B CN 114889976 B CN114889976 B CN 114889976B CN 202210822921 A CN202210822921 A CN 202210822921A CN 114889976 B CN114889976 B CN 114889976B
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China
Prior art keywords
main body
bottle cap
die
cavity
soft rubber
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CN202210822921.0A
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Chinese (zh)
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CN114889976A (en
Inventor
梁永明
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Suzhou Rapid Precision Mold Co ltd
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Suzhou Rapid Precision Mold Co ltd
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Priority to CN202210822921.0A priority Critical patent/CN114889976B/en
Publication of CN114889976A publication Critical patent/CN114889976A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D47/00—Closures with filling and discharging, or with discharging, devices
    • B65D47/04—Closures with discharging devices other than pumps
    • B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
    • B65D47/08—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures
    • B65D47/0804—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having articulated or hinged closures integrally formed with the base element provided with the spout or discharge passage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • B29C45/1628—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the moulding stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Closures For Containers (AREA)

Abstract

The invention discloses a bottle cap and a forming method thereof. The bottle cap comprises a flexible soft rubber layer, the soft rubber layer is provided with a first sealing part and a second sealing part, the first sealing part is positioned on the inner side of the main body part to seal the main body part and the bottle mouth, the second sealing part is positioned on the outer side of the main body part to seal the main body part and the turnover cover, and the main body part is provided with a through hole for the soft rubber material to pass through; the molding method comprises the following steps: closing the male die and the first female die to form a first die cavity, and injecting a main body material into the first die cavity to form a bottle cap main body; separating the male die from the first female die; the male die rotates to the second female die and is matched with the second female die to form a second die cavity, the bottle cap main body is located in the second die cavity, soft rubber materials are injected into the second die cavity, and the soft rubber materials flow into the inner side of the bottle cap main body from the outer side of the bottle cap main body through the through hole to form a soft rubber layer covering the bottle cap main body. The invention can form the flip type bottle cap by one-step injection molding, and the flip type bottle cap has better strength, elasticity and sealing performance.

Description

Bottle cap and forming method thereof
Technical Field
The invention relates to a bottle cap and a forming method thereof.
Background
The conventional sealing of the bottle mostly adopts a bottle cap made of HDPE (high density polyethylene). The HDPE material has proper hardness and good sealing effect, and is widely applied. However, HDPE material is not suitable for hinged flip-top closures, which have short hinge life and are not resilient. The material suitable for producing caps of the flip-type can be selected from PP (polypropylene), which is however relatively hard and does not allow to seal the bottle effectively. Therefore, currently, a silica gel gasket or an aluminum film gasket is additionally arranged, so that a better sealing effect is obtained. However, this makes the process of making the bottle cap more complicated and the appearance of the cap less attractive.
Disclosure of Invention
In order to solve the problems, the invention provides a method for forming a bottle cap, which can form a flip-type bottle cap through one-step injection molding, wherein the flip-type bottle cap has better strength, elasticity and sealing performance.
The invention also provides the bottle cap which has better strength, elasticity and sealing performance and is suitable for packaging sports drinks.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a forming method of a bottle cap comprises a bottle cap main body, wherein the bottle cap main body comprises a main body part and a flip cover, the main body part can be connected to a bottle opening of a bottle and is provided with a suction nozzle which can be communicated with the bottle, the flip cover is connected to the main body part through a hinge part which can be elastically deformed, the flip cover can turn around the hinge part relative to the main body part, and the flip cover is provided with a closing position which shields the suction nozzle and an opening position which is separated from the suction nozzle;
the bottle cap further comprises a flexible soft rubber layer, the soft rubber layer is provided with a first sealing part and a second sealing part, the first sealing part is positioned on the inner side of the main body part to seal the main body part and the bottle mouth, the second sealing part is positioned on the outer side of the main body part to seal the main body part and the turnover cover, a through hole for a soft rubber material to pass through is formed in the main body part, and the first sealing part and the second sealing part are integrally arranged;
the molding method comprises the following steps:
s1, a male die and a first female die are assembled to form a first die cavity, a main body material is injected into the first die cavity to form the bottle cap main body, and the flip cover is located at an opening position;
s2, separating the male die from the first female die, and keeping the bottle cap main body in the male die;
and S3, the male die rotates to a second female die and is matched with the second female die to form a second die cavity, the bottle cap main body is located in the second die cavity, a soft rubber material is injected into the second die cavity, and the soft rubber material flows into the inner side of the bottle cap main body from the outer side of the bottle cap main body through the through hole to form the soft rubber layer covered on the bottle cap main body.
In a preferred embodiment, the male mold has a movable mold core, and after the male mold and the second female mold are closed, the mold core moves to form a cavity corresponding to the first sealing portion between the inner side of the bottle cap body and the male mold.
In a preferred embodiment, the male die is matched with the second female die after being rotated by 180 degrees.
In a preferred embodiment, the molding method further comprises the steps of: s4, turning the turnover cover to a closed position in the male die; and S5, ejecting the bottle cap.
In a preferred embodiment, the number of the male dies is two, and when the first male die and the first female die are matched to execute the step S1, the second male die and the second female die are matched to execute the step S3; and when the first male die and the second female die are matched to execute the step S3, the second male die and the first female die are matched to execute the step S1.
More preferably, the first male die and the second male die are arranged on a rotatable die holder, the first female die and the second female die are arranged side by side, and the first male die and the second male die are interchanged by rotating the die holder 180 degrees.
In a specific and preferred embodiment, the molding method is specifically as follows:
s101, a first male die and a first female die are matched to form a first die cavity, a second male die and a second female die are matched to form a second die cavity, a bottle cap main body is arranged in the second die cavity, a die core of the second male die moves to give out an inner side cavity matched with a first sealing portion, and an outer side cavity matched with a second sealing portion is arranged between the bottle cap main body and the second female die; injecting a main body material into the first die cavity to form a bottle cap main body in the first die cavity, injecting a soft rubber material into the outer side cavity of the second die cavity, and allowing the soft rubber material to flow into the inner side cavity from the through hole of the bottle cap main body to form a soft rubber layer coated on the bottle cap main body;
s102, opening a mold;
s103, turning the turnover cover in the second male mold to a closed position;
s104, the bottle cap main body in the first male die is kept in a second male die, and a bottle cap in the second male die is ejected out;
s105, the die holder rotates 180 degrees, so that the first male die and the second male die are interchanged, the first male die and the second female die are closed to form a first die cavity to form a second die cavity, the die core of the first male die moves to give way to form an inner side cavity matched with the first sealing part, an outer side cavity matched with the second sealing part is formed between the bottle cap main body and the second female die, and the second male die and the first female die are closed to form a first die cavity; injecting a soft rubber material into the outer cavity of the second die cavity, wherein the soft rubber material flows into the inner cavity from the through hole of the bottle cap main body to form a soft rubber layer coated on the bottle cap main body, and injecting a main body material into the first die cavity to form the bottle cap main body in the first die cavity;
steps S101 to S105 are performed sequentially and cyclically.
In a preferred embodiment, the host material comprises PP.
In a preferred embodiment, the hardness of the soft glue material is 35 to 80 degrees.
In a preferred embodiment, the soft gel material is selected from thermoplastic elastomers.
In a preferred embodiment, the soft rubber material is selected from one or more of TPE, EVA, EVO, PVC, and silicone.
The invention also adopts the following technical scheme:
a bottle cap comprises a bottle cap body, wherein the bottle cap body comprises a main body part and a flip-open cover, the main body part can be connected to a bottle opening of a bottle and is provided with a suction nozzle which can be communicated with the bottle, the flip-open cover is connected to the main body part through a hinge part which can be elastically deformed, the flip-open cover can turn around the hinge part relative to the main body part, and the flip-open cover is provided with a closing position which can shield the suction nozzle and an opening position which is separated from the suction nozzle; the bottle cap further comprises a flexible soft rubber layer, the soft rubber layer is provided with a first sealing part and a second sealing part, the first sealing part is located on the inner side of the main body part to seal the main body part and the bottle mouth, the second sealing part is located on the outer side of the main body part to seal the main body part and the turnover cover, a through hole for a soft rubber material to pass through is formed in the main body part, and the first sealing part and the second sealing part are integrally arranged; the bottle cap is manufactured by the forming method.
In a preferred embodiment, the main body is provided with an anti-theft tear strip, and the anti-theft tear strip is broken or deformed when the flip cover is firstly turned from the closed position to the open position.
In a preferred embodiment, the main body is provided with an anti-theft tear ring, and the anti-theft tear ring is broken when the main body is rotated relative to the bottle mouth of the bottle.
In a preferred embodiment, the bottle cap is a sports drink bottle cap, a honey bottle cap or a condiment bottle cap.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
according to the bottle cap, the inner side of the bottle cap main body and the outer side of the suction nozzle are coated with the soft rubber layer, the soft rubber layer is made of soft flexible materials injected on the bottle cap main body, so that the sealing performance between a bottle opening and the bottle cap and between the suction nozzle and a turnover cover can be effectively guaranteed, and meanwhile, the bottle cap main body is made of materials with good strength and elasticity, so that the bottle cap has good strength and elasticity and good sealing performance; the bottle cap is formed by integral injection molding, the combinability of the two materials is better, the appearance is more attractive, and the production process is simpler.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a bottle cap according to an embodiment of the present invention, in which a flip-open cover is in an open position.
Fig. 2 is a cross-sectional view of the bottle cap of fig. 1.
Fig. 3 is a perspective view illustrating a bottle cap according to an embodiment of the present invention, in which a flip cover is in a closed position.
Fig. 4 is a cross-sectional view of the bottle cap shown in fig. 3.
Fig. 5 is a perspective view illustrating a bottle cap body according to an embodiment of the present invention.
Fig. 6 is a schematic view of an injection mold according to the present embodiment.
Fig. 7 is a partially enlarged view of a portion a in fig. 6.
Fig. 8 is a partial enlarged view of fig. 6 at B.
FIG. 9 is a schematic flow chart of a molding method according to an embodiment of the present invention.
Wherein, 1, a bottle cap; 101. a bottle cap body; 102. a soft adhesive layer;
11. a main body portion; 110. a suction nozzle; 111. a skirt edge; 112. a top plate; 112a, a through hole; 113. an anti-theft tear strip; 114. an anti-theft tear-off ring; 115. flanging; 12. a cover is turned; 12a, a containing groove; 13. a hinge portion;
102a, a first sealing part; 102b, a second sealing part;
21a, a first male die; 21b, a second male die; 210. a mold core; 22a, a first master mold; 22b, a second master model; 23. a first mold cavity; 24. a second mold cavity; 24a, an inner cavity; 24b, outer cavity.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment relates to a bottle cap, in particular to an anti-theft bottle cap for sports drinks, and also relates to a forming method of the bottle cap. Referring to fig. 1 to 5, the bottle cap 1 includes a cap body 101, and the cap body 101 includes a main body 11 and a flip cap 12 which are integrally formed. The material of the bottle cap body 101 is PP (polypropylene) and is formed by one-time injection molding. The main body 11 is connectable to a mouth of a bottle and has a mouthpiece 110 communicable with the bottle, and the lid 12 is connected to the main body 11 by a hinge 13 elastically deformable. The flip cover 12 can be turned around the hinge portion 13 with respect to the main body portion 11 so that the flip cover 12 has a closed position (shown in fig. 3 and 4) shielding the suction nozzle 110 and an open position (shown in fig. 1 and 2) separated from the suction nozzle 110. When the flip cover 12 is in the open position, liquid (such as sports drinks) in the bottle can flow out; when the lid 12 is in the closed position, the mouthpiece 110 is closed and the liquid in the bottle is enclosed and cannot flow out. In this embodiment, food-grade random copolymer PP is specifically selected as a material of the bottle cap main body 101, so as to ensure that the bottle cap main body 101 has certain strength, ensure that the bottle cap main body 101 does not crack or deform during transportation, ensure that the hinge portion 13 provides elasticity required by opening and closing of the flip 12, and ensure that the hinge portion 13 does not break when the flip is opened and closed for no less than 200 times.
Further, the main body portion 11 includes an annular skirt 111, and a top plate 112 connected to an upper edge of the skirt 111. The skirt 111 is matched with the bottle opening of the bottle, and the inner wall of the skirt 111 is provided with internal threads, so that the skirt can be screwed on the bottle opening of the bottle. The middle part of the top plate 112 is penetrated, and the suction nozzle 110 extends upwards from the penetrating part of the top plate 112; the lower surface of the top plate 112 is opposite to the upper end surface of the bottle mouth, and one or more through holes 112a are further formed in the top plate 112, as shown in fig. 5.
Further, the main body 11 is provided with an anti-theft tear strip 113, and when the lid 12 is first turned from the closed position to the open position, the anti-theft tear strip 113 is broken or deformed. Specifically, the tamper evident tear strip 113 and the hinge portion 13 described above are preferably located on opposite sides of the spout 110; the connection part between the anti-theft tear strip 113 and the main body 11 is designed to be thinned, and the connection part is configured to: when the flip 12 is covered on the suction nozzle 110 for the first time, the connection portion will not be broken, and when the flip 12 is turned over from the suction nozzle 110 for the first time (i.e. switched from the closed position to the open position), the anti-theft tear-off strip 113 is squeezed by the flip 12, so that the connection portion is broken, and thus it can be easily recognized whether the flip 12 is opened for the first time or not, and whether the suction nozzle 110 is used for the first time or not. Once the closure 1 is opened, the tamper-proof tear strip 113 is broken and cannot be restored, and it is apparent that the closure 1 has been opened.
Further, the main body 11 is provided with an anti-tamper tab 114, and when the main body 11 is rotated with respect to the mouth of the bottle, the anti-tamper tab 114 is broken. The anti-tearing pull ring 114 is specifically connected to the lower edge of the skirt 111, and the connection portion is designed to be hollow by thinning, so as to form one or more easily breakable connection points. In addition, the anti-tamper tab 114 is connected with a flange 115, and the flange 115 extends downwards from the lower edge of the anti-tamper tab 114 after injection molding; after the bottle cap 1 is formed, the flange 115 is turned upward so as to extend obliquely upward and inward from the lower edge of the tamper-evident ring 114. The flange 115 is relatively fixed to the bottle after the bottle cap 1 is fitted to the bottle mouth, and once the bottle cap 1 is rotated, relative rotation is generated between the main body 11 and the tamper-evident ring 114, and the connection point is broken, so that it can be easily recognized whether the bottle cap 1 is opened for the first time.
A receiving groove 12a is formed in the flip 12 to be matched with the suction nozzle 110, and the suction nozzle 110 is located in the receiving groove 12a when the flip 12 is at the closed position. The hinge portion 13 has a small thickness or a folded portion with a thin design, so that the lid 12 can be turned around the hinge portion 13 with respect to the main body portion 11.
The bottle cap 1 further comprises a flexible soft rubber layer 102, the soft rubber layer 102 is formed by injection molding of a soft rubber material, the hardness of the soft rubber material is smaller than that of the main body 11, and the hardness of the soft rubber material is preferably 35-80 degrees. The soft rubber material is selected from one or a combination of more of TPE, TPU, TPR, SEBS, EVA, EVO, PVC, silica gel and other thermoplastic elastomers; in this embodiment, the flexible glue material is food-grade TPE. The soft adhesive layer 102 has a first sealing portion 102a and a second sealing portion 102b, the first sealing portion 102a is located inside the main body portion 11 to seal the main body portion 11 and the mouth of the bottle, the second sealing portion 102b is located outside the main body portion 11 to seal the main body portion 11 and the lid 12, and the first sealing portion 102a and the second sealing portion 102b are integrally provided. Specifically, the first sealing part 102a covers the lower surface of the top plate 112, the second sealing part 102b covers the outer surface of the suction nozzle 110, and the through hole 112a of the top plate 112 is filled with a soft glue material, so that the first sealing part 102a and the second sealing part 102b can be integrally formed by injection molding through one nozzle. After the bottle cap 1 is connected to the mouth of the bottle, the first sealing part 102a is pressed between the top plate 112 and the upper end surface of the mouth to realize the sealing of the mouth and the bottle cap 1; after the flip cover 12 is snapped on the suction nozzle 110, the second sealing portion 102b is pressed between the inner wall of the flip cover 12 and the suction nozzle 110, so as to seal the flip cover 12 and the suction nozzle 110. The soft glue layer 102 provides good sealing performance, ensures that two parts (between the bottle opening and the top plate 112 and between the suction nozzle 110 and the flip cover 12) of the closed bottle cap 1 can bear 2MPa of air pressure for 2 minutes without air leakage, is beneficial to prolonging the storage life of liquid in the bottle, and cannot deteriorate even in a long time when the bottle is opened.
The bottle cap 1 is formed by injection molding, and an injection mold is shown in fig. 6. The injection mold comprises a first male mold 21a, a second male mold 21b, a first female mold 22a and a second female mold 22b which are arranged on the same injection molding machine, and the first male mold 21a and the second male mold 21b have the same structure; the first mother die 22a and the second mother die 22b have different cores, the first mother die 22a is provided with a nozzle of a main material, and the second mother die 22b is provided with a nozzle of a soft rubber material. The first male mold 21a may be clamped to the first female mold 22a or the second female mold 22b, and the second male mold 21b may be clamped to the first female mold 22a or the second female mold 22 b. After either the first male die 21a or the second male die 21b and the first female die 22a are closed, a first cavity 23 is formed, as shown in fig. 7, the shape of the first cavity 23 is consistent with the shape of the bottle cap body 101, and a nozzle of the body material injects the molten material into the first cavity 23 to mold the bottle cap body 101; after the first male die 21a and the second male die 21b are matched with the second female die 22b, a second die cavity 24 is formed, as shown in fig. 8, the shape of the second die cavity 24 is consistent with that of the bottle cap 1, and a nozzle of soft rubber material injects molten material into the second die cavity 24 to form a soft rubber layer 102 covering the bottle cap main body 101. It should be further noted that the first male mold 21a and the second male mold 21b are disposed side by side on the mold base, the mold base can rotate around a horizontally extending rotating shaft, and when the mold set rotates 180 degrees, the first male mold 21a and the second male mold 21b exchange positions. Accordingly, the first mother die 22a and the second mother die 22b are also arranged side by side.
Fig. 9 shows the forming process of the closure 1. The following describes in detail a process of forming a closure 1 by taking the first male mold 21a as an example, with reference to fig. 6 to 9:
s100, closing the first male die 21a and the first female die 22a to form a first die cavity 23, injecting a main body material into the first die cavity 23 to form a bottle cap main body 101, and at the moment, enabling the turnover cover 12 to be in an open position;
s200, separating the first male die 21a from the first female die 22a, and keeping the bottle cap main body 101 in the first male die 21 a;
s300, rotating the first male die 21a 180 degrees, enabling the first male die 21a to be opposite to the second female die 22b and to be matched with the second female die 22b to form a second die cavity 24, enabling the bottle cap main body 101 to be located in the second die cavity 24, injecting a soft rubber material into the second die cavity 24, enabling the soft rubber material to flow into the inner side of the bottle cap main body 101 from the outer side of the bottle cap main body 101 through the through hole 112a, and forming a soft rubber layer 102 covering the bottle cap main body 101;
s400, turning the flip cover 12 to a closed position in the first male die 21 a;
and S500, ejecting the bottle cap 1.
After the bottle cap body 101 is formed in the first mold cavity 23, the top surface of the mold core 210 of the first male mold 21a contacts the inner side surface of the bottle cap body 101, that is, the top surface of the mold core 210 serves as a part of the cavity wall forming the first mold cavity 23. In step S300, after the first male mold 21a and the second female mold 22b are closed, the mold core 210 moves (e.g., retracts backward by a distance corresponding to the thickness of the first sealing portion 102 a) so that an inner cavity 24a corresponding to the first sealing portion 102a is formed between the inner side of the closure body 101 and the male mold. Meanwhile, an outer cavity 24b is formed between the body 101 and the second female die 22b in the second cavity 24 to cooperate with the second sealing portion 102 b. The nozzle of the second female die 22b injects a soft adhesive material into the outer cavity 24b, the soft adhesive material flows into the inner cavity 24a through the through hole 112a on the top plate 112 of the bottle cap body 101, and the soft adhesive material fills the part of the second cavity 24 not occupied by the bottle cap body 101 to form the soft adhesive layer 102 covering the bottle cap body 101.
The step of forming with the second male die 21b is substantially the same as the second male die 21b except that the steps are performed in time-staggered fashion. For example, when the first male mold 21a and the first female mold 22a are closed to execute step S1, the second male mold 21b and the second female mold 22b are closed to execute step S3; when the first male mold 21a and the second female mold 22b are closed to execute step S3, the second male mold 21b and the first female mold 22a are closed to execute step S1. The process in which the first male die 21a and the second male die 21b operate simultaneously will be described below.
S101, a first male die 21a and a first female die 22a are matched to form a first cavity 23, a second male die 21b and a second female die 22b are matched to form a second cavity 24, a bottle cap main body 101 is arranged in the second cavity 24, a die core 210 of the second male die 21b moves to give way to form an inner side cavity 24a matched with a first sealing part 102a, and an outer side cavity 24b matched with a second sealing part 102b is arranged between the bottle cap main body 101 and the second female die 22 b; injecting a main body material into the first die cavity 23 to form a bottle cap main body 101 in the first die cavity 23, injecting a soft rubber material into the outer side cavity 24b of the second die cavity 24, and allowing the soft rubber material to flow into the inner side cavity 24a from the through hole 112a of the bottle cap main body 101 to form a soft rubber layer 102 coated on the bottle cap main body 101;
s102, opening a mold;
s103, turning the turnover cover 12 in the second male die 21b to a closed position;
s104, the bottle cap body 101 in the first male die 21a is kept in the second male die 21b, and the bottle cap 1 in the second male die 21b is ejected;
s105, rotating the mold base by 180 degrees to exchange the positions of the first male mold 21a and the second male mold 21b, closing the first male mold 21a and the second female mold 22b to form a first mold cavity 23 to form a second mold cavity 24, moving the mold core 210 of the first male mold 21a to give way to form an inner cavity 24a matched with the first sealing part 102a, forming an outer cavity 24b matched with the second sealing part 102b between the bottle cap body 101 and the second female mold 22b, and closing the second male mold 21b and the first female mold 22a to form the first mold cavity 23; injecting soft rubber material into the outer cavity 24b of the second mold cavity 24, wherein the soft rubber material flows into the inner cavity 24a from the through hole 112a of the bottle cap main body 101 to form a soft rubber layer 102 coated on the bottle cap main body 101, and injecting the main body material into the first mold cavity 23 to form the bottle cap main body 101 in the first mold cavity 23;
the above steps S101 to S105 are performed sequentially and cyclically.
In the bottle cap 1 of the embodiment, the inner side of the bottle cap main body 101 contacting with the bottle mouth and the outer side of the suction nozzle 110 are wrapped with a layer of soft rubber material, the bottle cap main body 101 is made of PP material, the hinge part 13 of the bottle cap main body 101 connected with the flip cover 12 has better elasticity, and meets the requirement of the set opening times of the flip cover 12, and meanwhile, the soft rubber material enables the bottle cap 1 and the bottle mouth of the bottle to have better sealing performance, and the suction nozzle 110 and the flip cover 12 have better sealing performance. During forming, the soft rubber material is wrapped on the main body of the turnover cover 12 through secondary injection molding, the whole bottle cap 1 is integrally formed on one injection molding machine, the main body material and the soft rubber material are firmly combined, and the appearance of the bottle cap 1 is attractive.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims (10)

1. A forming method of a bottle cap comprises a bottle cap main body, wherein the bottle cap main body comprises a main body part and a flip cover, the main body part can be connected to a bottle opening of a bottle and is provided with a suction nozzle which can be communicated with the bottle, the flip cover is connected to the main body part through a hinge part which can be elastically deformed, the flip cover can turn around the hinge part relative to the main body part, and the flip cover is provided with a closing position which shields the suction nozzle and an opening position which is separated from the suction nozzle; the bottle cap is characterized by further comprising a flexible soft rubber layer, wherein the soft rubber layer is provided with a first sealing part and a second sealing part, the first sealing part is positioned on the inner side of the main body part to seal the main body part and a bottle opening, the second sealing part is positioned on the outer side of the main body part to seal the main body part and the turnover cover, a through hole for a soft rubber material to pass through is formed in the main body part, and the first sealing part and the second sealing part are integrally arranged;
the molding method comprises the following steps:
s1, a male die and a first female die are assembled to form a first die cavity, a main body material is injected into the first die cavity to form the bottle cap main body, and the flip cover is located at an opening position;
s2, separating the male die from the first female die, and keeping the bottle cap main body in the male die;
s3, the male die rotates to a second female die and is matched with the second female die to form a second die cavity, the bottle cap main body is located in the second die cavity, soft rubber materials are injected into the second die cavity and flow into the inner side of the bottle cap main body from the outer side of the bottle cap main body through the through hole, and the soft rubber layer covering the bottle cap main body is formed;
the number of the male dies is two, and when the first male die and the first female die are matched to execute the step S1, the second male die and the second female die are matched to execute the step S3; when the first male die and the second female die are matched and the step S3 is executed, the second male die and the first female die are matched and the step S1 is executed; the first male die and the second male die are arranged on a rotatable die holder, the first female die and the second female die are arranged side by side, and the first male die and the second male die are interchanged in position by rotating the die holder by 180 degrees;
the molding method comprises the following specific steps:
s101, a first male die and a first female die are assembled to form a first die cavity, a second male die and a second female die are assembled to form a second die cavity, a bottle cap main body is arranged in the second die cavity, a die core of the second male die moves to give out an inner side cavity matched with a first sealing portion, and an outer side cavity matched with a second sealing portion is formed between the bottle cap main body and the second female die; injecting a main body material into the first die cavity to form a bottle cap main body in the first die cavity, injecting a soft rubber material into the outer side cavity of the second die cavity, and allowing the soft rubber material to flow into the inner side cavity from the through hole of the bottle cap main body to form a soft rubber layer coated on the bottle cap main body;
s102, opening a mold;
s103, turning the turnover cover in the second male die to a closed position;
s104, the bottle cap body in the first male die is kept in a second male die, and a bottle cap in the second male die is ejected out;
s105, the die holder rotates 180 degrees, so that the first male die and the second male die are interchanged, the first male die and the second female die are closed to form a first die cavity to form a second die cavity, the die core of the first male die moves to give way to form an inner side cavity matched with the first sealing part, an outer side cavity matched with the second sealing part is formed between the bottle cap main body and the second female die, and the second male die and the first female die are closed to form a first die cavity; injecting a soft rubber material into the outer cavity of the second die cavity, wherein the soft rubber material flows into the inner cavity from the through hole of the bottle cap main body to form a soft rubber layer coated on the bottle cap main body, and injecting a main body material into the first die cavity to form the bottle cap main body in the first die cavity;
steps S101 to S105 are performed sequentially and cyclically.
2. The method of forming a bottle cap according to claim 1, wherein the male mold has a movable core, and when the male mold and the second female mold are closed, the core moves such that a cavity corresponding to the first sealing portion is formed between the inner side of the bottle cap body and the male mold.
3. The method of forming a bottle cap according to claim 1, wherein the male mold is rotated 180 degrees and then closed with the second female mold.
4. The method of forming a bottle cap according to claim 1, further comprising the steps of: s4, turning the turnover cover to a closed position in the male die; and S5, ejecting the bottle cap.
5. The method for molding a bottle cap according to claim 1, wherein the main material comprises PP; the hardness of the soft rubber material is 35-80 degrees, and the soft rubber material is selected from thermoplastic elastomers.
6. The method for molding a bottle cap according to claim 1, wherein the soft rubber material is selected from one or more of TPE, TPU, TPR, SEBS, EVA, EVO, PVC and silica gel.
7. A bottle cap comprises a bottle cap main body, wherein the bottle cap main body comprises a main body part and a flip cover, the main body part can be connected to a bottle opening of a bottle and is provided with a suction nozzle which can be communicated with the bottle, the flip cover is connected to the main body part through a hinge part which can deform elastically, the flip cover can turn around the hinge part relative to the main body part, and the flip cover is provided with a closing position which shields the suction nozzle and an opening position which is separated from the suction nozzle; the bottle cap is characterized by further comprising a flexible soft rubber layer, wherein the soft rubber layer is provided with a first sealing part and a second sealing part, the first sealing part is positioned on the inner side of the main body part to seal the main body part and a bottle opening, the second sealing part is positioned on the outer side of the main body part to seal the main body part and the turnover cover, a through hole for a soft rubber material to pass through is formed in the main body part, and the first sealing part and the second sealing part are integrally arranged; the bottle cap is manufactured by the molding method according to any one of claims 1 to 6.
8. The bottle cap of claim 7, wherein the main body is provided with an anti-theft tear strip, and the anti-theft tear strip is broken or deformed when the flip-top is first flipped from the closed position to the open position.
9. The bottle cap of claim 7, wherein the main body is provided with a tamper-proof pull ring, and the tamper-proof pull ring is broken when the main body is rotated with respect to a mouth of the bottle.
10. The bottle cap of claim 7, wherein the bottle cap is a sports drink bottle cap, a honey bottle cap, or a condiment bottle cap.
CN202210822921.0A 2022-07-14 2022-07-14 Bottle cap and forming method thereof Active CN114889976B (en)

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CN1134386A (en) * 1995-01-23 1996-10-30 有限会社复合塑料工业会 Closed container and its producing method
FR2752820A1 (en) * 1996-08-29 1998-03-06 Oreal DISTRIBUTION CAPSULE WITH IMPROVED SEALING
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CN1575249A (en) * 2001-09-20 2005-02-02 西奎斯特-罗夫勒塑料加工厂有限公司 Feeding cover of container for freeflowing material
EP1870346A1 (en) * 2006-06-19 2007-12-26 Hans Kühn Plastic closure system and method for its production
CN103619722A (en) * 2011-04-18 2014-03-05 李洙才 Apparatus for receiving heterogeneous materials
CN206733500U (en) * 2017-04-18 2017-12-12 杭州余杭振华日化玻璃有限公司 Automatic forming die of bi-material layers
CN111989203A (en) * 2017-03-31 2020-11-24 Csp技术公司 Method of overmolding a softer material with a harder material and moisture resistant container assembly made by the method
CN213036492U (en) * 2020-07-03 2021-04-23 浙江金驰塑业有限公司 Transparent sealed health-care product bottle

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2341936A1 (en) * 1973-08-20 1975-03-06 Blendax Werke Schneider Co Collapsible (esp. aluminium or aluminium alloy)tube - has plastics captive closure that need not be screwed on and off
CN1134386A (en) * 1995-01-23 1996-10-30 有限会社复合塑料工业会 Closed container and its producing method
FR2752820A1 (en) * 1996-08-29 1998-03-06 Oreal DISTRIBUTION CAPSULE WITH IMPROVED SEALING
US6305563B1 (en) * 1999-01-12 2001-10-23 Aptargroup, Inc, One-piece dispensing structure and method and apparatus for making same
CN1575249A (en) * 2001-09-20 2005-02-02 西奎斯特-罗夫勒塑料加工厂有限公司 Feeding cover of container for freeflowing material
EP1870346A1 (en) * 2006-06-19 2007-12-26 Hans Kühn Plastic closure system and method for its production
CN103619722A (en) * 2011-04-18 2014-03-05 李洙才 Apparatus for receiving heterogeneous materials
CN111989203A (en) * 2017-03-31 2020-11-24 Csp技术公司 Method of overmolding a softer material with a harder material and moisture resistant container assembly made by the method
CN206733500U (en) * 2017-04-18 2017-12-12 杭州余杭振华日化玻璃有限公司 Automatic forming die of bi-material layers
CN213036492U (en) * 2020-07-03 2021-04-23 浙江金驰塑业有限公司 Transparent sealed health-care product bottle

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