Blowing mould, blowing machine and plastic bottle

Abstract

The present invention discloses a bottle blowing mold, a bottle blowing machine and a plastic bottle. The bottle blowing mold has a mold cavity. After the bottle embryo is blown, a bottle body, a bottle shoulder, a handle and a bottle neck are formed in the mold cavity. The bottle shoulder is located between the bottle body and the bottle neck. One end of the handle is connected to the bottle shoulder, and the other end of the handle is also connected to the bottle shoulder or the bottle neck. At least one first convex rib is provided on the cavity wall of the mold cavity. The first convex rib forms a non-closed or annularly closed first groove on the bottle body. The first convex rib plays a role in limiting the movement of the blank material in the bottle body toward the bottle shoulder and the handle during the blowing process, preventing wrinkles from being generated at the bottle shoulder and avoiding deformation of the handle, thereby improving the blowing quality of the bottle embryo. The plastic bottle produced by the bottle blowing mold of the embodiment of the present invention is blown by a bottle embryo with a handle. Since there is no handle that needs to be assembled separately, the production process is simplified, the production efficiency is improved, the production cost is reduced, and the handle is prevented from falling off.

Description

Technical Field

[0001] The invention relates to the technical field of bottle blowing, and in particular to a bottle blowing mold, a bottle blowing machine and a plastic bottle. Background Art

[0002] At present, plastic milk bottles and beverage bottles with built-in handles on the market are mainly divided into two categories, one is HDPE bottles with built-in handles, and the other is PET bottles with rear handles. Among them, HDPE bottles with built-in handles have defects such as incomplete sealing, easy damage to the bottle body, and uncontrollable bottle capacity; while the other PET bottles have advantages over HDPE bottles such as good sealing, strong bottle body, high oxygen barrier performance, and transparency and easy observation, but currently PET bottles all need to have rear handles, and the handles in PET bottles with rear handles require specific equipment to produce and install, and are easy to fall off after installation. The above reasons have prompted relevant companies in the industry to hope to replace the PET bottles with rear handles on the market with PET bottles with built-in handles.

[0003] In order to ensure that the position of the handle remains unchanged and the shape is intact, the blank at the handle of the preform can only be stretched horizontally, not vertically. Therefore, it is necessary to perform technical treatment on the handle during the preform heating process to prevent deformation caused by the handle becoming soft due to excessive temperature during the blowing process, which in turn causes the blowing failure. The PET bottle with its own handle is made by a two-step blowing process, that is, the preform is first injected and then blown into a bottle in a blowing mold. Since the preform with its own handle has an additional handle compared to the conventional preform, problems that do not occur in the conventional preform blowing process will occur during the preform blowing process. After the preform is heated, the temperature of the handle is lower, while the temperature of the bottle body is higher, making the blank at the bottle body softer than the blank at the handle. During the process of stretching and blowing, the blank at the bottle body expands first and fills the bottle body of the mold. At this time, the handle of the preform has not yet been attached to the inner wall of the mold. When the blow molding continues, the blank of the bottle body will push the handle to the inner wall of the mold under the action of compressed air, and finally stick to the mold together with the blank of the handle under the action of compressed air. After the bottle blank is blown, wrinkles are easily formed on the shoulder opposite the handle, and the lower end of the handle is also prone to move up, resulting in unqualified bottle quality. Summary of the invention

[0004] One object of the present invention is to provide a bottle blowing mold and a bottle blowing machine, which can form a non-closed or annularly closed first groove on the bottle body, prevent wrinkles from forming at the bottle shoulder and avoid deformation of the handle.

[0005] Another object of the present invention is to provide a plastic bottle which is blown from a bottle embryo with a handle, has high production efficiency and low cost, and can prevent the handle from falling off.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A bottle blowing mold is provided, which has a mold cavity. After the bottle embryo is blown, a bottle body, a bottle shoulder, a handle and a bottle neck are formed in the mold cavity. The bottle shoulder is located between the bottle body and the bottle neck, one end of the handle is connected to the bottle shoulder, and the other end of the handle is also connected to the bottle shoulder or the bottle neck. At least one first rib is provided on the cavity wall of the mold cavity, and the first rib forms a non-closed or annularly closed first groove on the bottle body.

[0008] As a preferred solution of the present invention, a second convex rib is further provided on the cavity wall, and the second convex rib forms a second groove at the junction of the bottle shoulder and the bottle body.

[0009] As a preferred solution of the present invention, the first convex rib is arranged on a plane or the first convex rib is arranged on the cavity wall in a wave shape.

[0010] As a preferred solution of the present invention, the number of the first ribs is not less than two, and the first ribs are spaced apart from each other or partially connected.

[0011] As a preferred solution of the present invention, at least one third convex rib is further provided on the cavity wall, and the third convex rib forms a non-closed third groove on the bottle shoulder.

[0012] As a preferred solution of the present invention, the mold cavity includes a first recessed area, and the first recessed area forms a raised step structure on the bottleneck.

[0013] As a preferred solution of the present invention, the mold cavity includes a second recessed area, and the second recessed area is used to accommodate the handle.

[0014] On the other hand, a bottle blowing machine is provided, comprising the bottle blowing mold described in any of the above technical solutions.

[0015] In addition, a plastic bottle is provided, which is made by the bottle blowing machine.

[0016] As a preferred solution of the present invention, the material of the plastic bottle is PET.

[0017] Beneficial effects of the present invention:

[0018] The bottle blowing mold of the present invention is provided with at least one first convex rib on the cavity wall of the mold cavity, and the first convex rib forms a first annular closed or non-closed groove on the bottle body, and the first convex rib limits the movement of the blank material at the bottle body to the bottle shoulder and the handle during the blowing process, thereby preventing wrinkles at the bottle shoulder and avoiding deformation of the handle, thereby improving the blowing quality of the bottle blank. The plastic bottle made by the bottle blowing mold of the present invention is blown from the bottle blank with a handle. Since there is no handle that needs to be assembled separately, the production process is simplified, the production efficiency is improved, the production cost is reduced, and the handle is prevented from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a bottle embryo with a handle before being blown using a conventional mold;

[0020] Figure 2 This is a schematic diagram of using a conventional mold to blow a bottle preform with a handle;

[0021] Figure 3 This is a schematic diagram of a bottle preform with a handle after being blown using a conventional mold;

[0022] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 6 This is a schematic diagram of a bottle blowing mold according to an embodiment of the present invention before blowing a bottle blank with a handle;

[0025] Figure 7 This is a schematic diagram of a process in which a bottle blowing mold according to an embodiment of the present invention is used to blow a bottle blank with a handle;

[0026] Figure 8 This is a schematic diagram of a bottle blowing mold according to an embodiment of the present invention when the bottle preform with a handle is nearly finished being blown;

[0027] Fig. 9 This is a schematic diagram of a bottle blowing mold according to an embodiment of the present invention after blowing a bottle blank with a handle;

[0028] Fig.10 for Fig. 9 Enlarged view of point C in the middle;

[0029] Fig.11 is a three-dimensional schematic diagram of a plastic bottle according to an embodiment of the present invention;

[0030] Fig.12 A schematic diagram of the mold cavity structure of a bottle blowing mold according to another embodiment of the present invention;

[0031] Fig.13 for Fig.12 The enlarged view of point D in the middle;

[0032] Fig.14 for Fig.12 Enlarged view of point E in the middle;

[0033] Fig.15 To adopt Fig.12 A three-dimensional schematic diagram of a plastic bottle blown by a blow mold shown;

[0034] Fig.16 A schematic diagram of the mold cavity structure of a bottle blowing mold according to another embodiment of the present invention;

[0035] Fig.17 To adopt Fig.16 A three-dimensional schematic diagram of a plastic bottle blown by a blow mold shown;

[0036] Fig.18 A schematic diagram of the mold cavity structure of a bottle blowing mold according to another embodiment of the present invention;

[0037] Fig.19 To adopt Fig.18 A three-dimensional schematic diagram of a plastic bottle blown by a blow mold shown;

[0038] Fig. 20 It is a schematic diagram of the mold cavity structure of a bottle blowing mold according to another embodiment of the present invention;

[0039] Fig.21 To adopt Fig. 20 A three-dimensional schematic diagram of a plastic bottle blown by a blow mold shown;

[0040] Fig. 22 It is a three-dimensional schematic diagram of a bottle blowing mold according to an embodiment of the present invention.

[0041] In the figure:

[0042] 1', conventional mold; 1, bottle blowing mold; 10, mold cavity; 11, left half mold; 12, right half mold; 13, bottom mold; 101, first convex rib; 102, second convex rib; 103, third convex rib; 104, first recessed area; 105, second recessed area; 100, bottle embryo; 100', plastic bottle; 110, bottle body; 120, bottle shoulder; 1201, first fold; 1202, second fold; 130, handle; 140, bottleneck; 200, stretch rod; 1100, first groove; 1200, second groove; 1300, third groove; 1400, step structure. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0046] The two-step bottle blowing process requires first manufacturing a bottle embryo 100, and then blowing the bottle embryo 100 with a specific mold, such as Figures 1 to 5 As shown, when a conventional mold 1' is used to blow a preform 100 with a handle 130, due to the additional handle 130, during the stretching and expansion process of the preform 100, the blank at the bottle body 110 expands first and fills the lower part of the mold cavity 10. At this time, the handle 130 of the preform 100 has not yet been attached to the cavity wall of the mold cavity 10. As the blowing proceeds, the blank at the bottle body 110 will push the handle 130 toward the cavity wall of the mold cavity 10 under the action of compressed air, and finally, under the action of compressed air, the blank and the handle 130 are attached to the cavity wall of the mold cavity 10. After the blowing is completed, a first wrinkle 1201 (such as Figure 4 As shown in FIG. 1 , the lower end of the handle 130 will also deviate upward, causing the handle 130 to deform (as shown in FIG. 1 ). Figure 5 As shown, the dotted line shows the correct position of the lower end of the handle 130), thus causing quality defects.

[0047] like Figures 6 to 11 As shown, the bottle blowing mold 1 of this embodiment has a mold cavity 10. After the bottle embryo 100 is blown, a bottle body 110, a bottle shoulder 120, a handle 130 and a bottle neck 140 are formed in the mold cavity 10. The bottle shoulder 120 is located between the bottle body 110 and the bottle neck 140. One end of the handle 130 is connected to the bottle shoulder 120, and the other end of the handle 130 is connected to the bottle neck 140. Both ends of the handle 130 can also be connected to the bottle shoulder 120. At least one first convex rib 101 is provided on the cavity wall of the mold cavity 10. The first convex rib 101 forms a non-closed or annularly closed first groove 1100 on the bottle body 110.

[0048] The bottle blowing mold 1 of this embodiment is provided with at least one first convex rib 101 on the cavity wall of the mold cavity 10. The first convex rib 101 forms a non-closed or annularly closed first groove 1100 on the bottle body 110. The first convex rib 101 limits the movement of the blank at the bottle body 110 toward the bottle shoulder 120 and the handle 130 during the blowing process, prevents the first wrinkle 1201 from being generated at the bottle shoulder 120, avoids the deformation of the handle 130, and improves the blowing quality of the bottle blank 100. The first convex rib 101 is preferably arranged close to the bottle shoulder 120 to obtain a better effect of limiting the movement of the blank. In addition, the first groove 1100 also plays a role in enhancing the structural strength of the bottle body 110. By providing multiple first convex ribs 101, multiple first grooves 1100 can be obtained, thereby greatly improving the structural strength of the bottle body 110 and making it less likely to deform.

[0049] Preferably, a second convex rib 102 is further provided on the cavity wall of the mold cavity 10, and the second convex rib 102 forms a second groove 1200 at the junction of the bottle shoulder 120 and the bottle body 110. The second convex rib 102 also serves to limit the movement of the blank material at the bottle body 110 toward the bottle shoulder 120 and the handle 130 during the blowing process, which can further improve the blowing quality of the preform 100.

[0050] Furthermore, the first convex rib 101 is arranged on a plane or the first convex rib 101 is arranged on the cavity wall in a wave shape, and the specific shape of the first convex rib 101 can be flexibly selected according to actual needs. Fig.12 and Fig.16 As shown, the first rib 101 is in a closed ring shape or an open arc shape, and the first rib 101 is arranged on a plane so that the height of each part of the first groove 1100 is the same. Fig.18 and Fig.19 As shown, the first rib 101 is wavy, so that the first groove 1100 is also wavy, and the first groove 1100 is not at the same height at all locations.

[0051] When the number of the first ribs 101 is greater than two, the first ribs 101 may be arranged to be spaced apart from each other or partially connected together. Fig. 20 and Fig.21 As shown, each first rib 101 is partially connected, so that each first groove 1100 also partially overlaps.

[0052] like Figures 12 to 15 As shown, preferably, at least one third convex rib 103 is further provided on the cavity wall of the mold cavity 10 , and the third convex rib 103 forms a non-closed third groove 1300 on the bottle shoulder 120 . Figures 6 to 9 The process of blowing a preform 100 in one embodiment is shown. Fig.10As shown, after the blow molding is completed, the second wrinkle 1202 is easily generated at the connection between the bottle shoulder 120 and the bottle neck 140. By providing the third convex rib 103, a third groove 1300 can be generated on the bottle shoulder 120. The third convex rib 103 restricts the blank of the bottle shoulder 120 from moving toward the bottle neck 140 during the blow molding process, thereby preventing the second wrinkle 1202 from being generated at the connection between the bottle shoulder 120 and the bottle neck 140.

[0053] like Fig.12 , Fig.14 and Fig.15 As shown, preferably, the mold cavity 10 includes a first recessed area 104, and the first recessed area 104 forms a raised step structure 1400 on the bottleneck 140. The step structure 1400 can accommodate more blanks at the bottleneck 140, thereby preventing the second wrinkle 1202 from being generated at the connection between the bottle shoulder 120 and the bottleneck 140.

[0054] like Fig.15 As shown, preferably, the mold cavity 10 includes a second recessed area 105, and the second recessed area 105 is used to accommodate the handle 130. The shape of the second recessed area 105 matches the shape of the handle 130, so that the handle 130 can stop at the correct position during the blowing process of the preform 100.

[0055] Preferably, Fig. 22 As shown, the bottle blowing mold 1 includes a left half mold 11, a right half mold 12 and a bottom mold 13. The left half mold 11, the right half mold 12 and the bottom mold 13 are assembled to form a mold cavity 10. Figures 6 to 9 The blowing steps of the preform 100 are as follows: first, the left half mold 11 and the right half mold 12 are separated, and then the heated preform 100 is placed between the left half mold 11 and the right half mold 12, and then the left half mold 11, the right half mold 12 and the bottom mold 13 are closed, and the stretching rod 200 is inserted into the preform 100 from the preform mouth to stretch the preform 100 longitudinally, and at the same time, compressed air is blown into the preform 100 from the preform mouth to stretch the preform 100 transversely. After the blowing of the preform 100 is completed, the bottle blowing mold 1 is opened.

[0056] An embodiment of the present invention further provides a bottle blowing machine, comprising the bottle blowing mold 1 of any of the above embodiments, so that the bottle blowing machine can perform high-quality blowing on the preform 100 with a handle 130 .

[0057] like Fig.11 , Fig.15 , Fig.17 , Fig.19 and Fig.21 As shown, an embodiment of the present invention further provides a plastic bottle 100', which is made by the above-mentioned bottle blowing machine. The plastic bottle 100' has a handle 130, rather than installing an independent handle after the blowing is completed, which simplifies the production process, reduces the production cost, and does not need to worry about the problem of the independent handle falling off.

[0058] Preferably, the material of the plastic bottle 100 ′ is PET, so that the plastic bottle 100 ′ has the advantages of good sealing, strong bottle body, high oxygen barrier performance, and transparency and easy observation.

[0059] As a preferred embodiment of the present invention, in the description of this specification, the description with reference to the term "preferred" or the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above embodiments are only used to illustrate the detailed scheme of the present invention, and the present invention is not limited to the above detailed scheme, that is, it does not mean that the present invention must rely on the above detailed scheme to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A blow molding mold for a preform with a handle, characterized in that: A mold cavity is provided, and after the preform with a handle is blown, a bottle body, a bottle shoulder, a handle and a bottle neck are formed in the mold cavity, wherein the bottle shoulder is located between the bottle body and the bottle neck, one end of the handle is connected to the bottle shoulder, and the other end of the handle is also connected to the bottle shoulder or the bottle neck, and at least one first convex rib is provided on the cavity wall of the mold cavity, and the first convex rib forms a non-closed or annularly closed first groove on the bottle body; The cavity wall is also provided with a second convex rib, and the second convex rib forms a second groove at the junction of the bottle shoulder and the bottle body; The mold cavity includes a first recessed area, and the first recessed area forms a raised step structure on the bottleneck.

2. The blow molding mold for a preform with a handle according to claim 1, characterized in that: The first convex rib is arranged on a plane or the first convex rib is arranged on the cavity wall in a wave shape.

3. The blowing mold for a preform with a handle according to claim 1, characterized in that: The number of the first ribs is not less than two, and the first ribs are spaced apart from each other or partially connected.

4. The blowing mold for a preform with a handle according to claim 1, characterized in that: At least one third convex rib is also provided on the cavity wall, and the third convex rib forms a non-closed third groove on the bottle shoulder.

5. The blowing mold for a preform with a handle according to claim 1, characterized in that: The mold cavity includes a second recessed area, and the second recessed area is used to accommodate the handle.

6. A bottle blowing machine, characterized in that: A bottle blowing mold for a bottle preform with a handle according to any one of claims 1 to 5.

7. A plastic bottle, characterized in that: Made by the bottle blowing machine described in claim 6.

8. The plastic bottle according to claim 7, characterized in that: The material of the plastic bottle is PET.

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