Blow molding molds, bottle blowing machines and plastic bottles

Abstract

The present invention discloses a blow molding mold, a bottle blowing machine and a plastic bottle. The blow molding mold has a mold cavity. After the bottle embryo is blown, a bottle body, a bottle shoulder, a handle and a bottleneck are formed in the mold cavity. The bottle shoulder is located between the bottle body and the bottleneck. 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 to the bottleneck. The mold cavity includes a first recessed area, and the first recessed area forms a raised step structure on the bottleneck. The mold cavity of the blow molding mold of the present invention includes a first recessed area, and the first recessed area forms a raised step structure on the bottleneck, so that more blanks are occupied there, wrinkles are prevented from appearing at the connection between the bottle shoulder and the bottleneck, and the blowing quality of the bottle embryo is improved. The plastic bottle made by the blow molding 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 avoided from falling off.

Description

Technical Field

[0001] The invention relates to the technical field of bottle blowing, in particular to a blow molding 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 material at the handle part of the preform can only be stretched horizontally, not vertically. Therefore, it is necessary to perform technical treatment on the handle part during the preform heating process to prevent deformation caused by the handle part becoming soft due to excessive temperature during the blowing process, which in turn causes the blowing failure. PET bottles with built-in handles are made using a two-step blowing process, that is, the preform is first injection molded, and then the preform is blown into a bottle in a blow mold. Since the preform with built-in handles has an additional handle compared to conventional preforms, problems that do not occur in conventional preform blowing will occur during the preform blowing process. After the preform is blown, wrinkles are easily formed at the connection between the bottle shoulder opposite the handle and the neck of the bottle, resulting in unqualified bottle quality. Summary of the invention

[0004] One object of the present invention is to provide a blow molding mold and a bottle blowing machine, which can form a raised step structure at the bottle shoulder to prevent wrinkles from forming at the connection between the bottle shoulder and the bottle neck.

[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 blow molding 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. The mold cavity includes a first recessed area, and the first recessed area forms a raised step structure on the bottle neck.

[0008] As a preferred solution of the present invention, at least one first convex rib is provided on the cavity wall of the mold cavity, and the first convex rib forms a first groove on the bottle shoulder.

[0009] As a preferred solution of the present invention, the first rib is arranged perpendicular to the height direction of the bottle shoulder.

[0010] As a preferred solution of the present invention, at least one second convex rib is further provided on the cavity wall of the mold cavity, and the second convex rib forms a non-closed or annularly closed second groove on the bottle body.

[0011] As a preferred solution of the present invention, the second convex rib is arranged on a plane or the second convex rib is arranged on the cavity wall in a wave shape.

[0012] As a preferred solution of the present invention, the number of the second convex ribs is not less than two, and the second convex ribs are spaced apart from each other or partially connected.

[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 blow molding 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 mold cavity of the blow molding mold of the present invention includes a first concave area, and the first concave area forms a raised step structure on the neck of the bottle, so that more blanks are occupied at this place, wrinkles are prevented from appearing at the connection between the bottle shoulder and the neck of the bottle, and the blowing quality of the bottle blank is improved. The plastic bottle made by the blow molding 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 1This 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 a bottle preform with a handle after being blown using a conventional mold;

[0021] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 Schematic diagram of the mold cavity structure of a blow mold according to an embodiment of the present invention;

[0023] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0024] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0025] Figure 7 is a three-dimensional schematic diagram of a plastic bottle according to an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of a mold cavity structure of a blow mold according to another embodiment of the present invention;

[0027] Fig. 9 To adopt Figure 8 A three-dimensional schematic diagram of a plastic bottle blown by a blow molding mold shown;

[0028] Fig.10 A schematic diagram of a mold cavity structure of a blow mold according to another embodiment of the present invention;

[0029] Fig.11 To adopt Fig.10 A three-dimensional schematic diagram of a plastic bottle blown by a blow molding mold shown;

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

[0031] Fig.13 To adopt Fig.12 A three-dimensional schematic diagram of a plastic bottle blown by a blow molding mold shown;

[0032] Fig.14 It is a three-dimensional schematic diagram of a blow molding mold according to an embodiment of the present invention.

[0033] In the figure:

[0034] 1', conventional mold; 1, blow molding mold; 10, mold cavity; 11, left half mold; 12, right half mold; 13, bottom mold; 101, first recessed area; 102, first convex rib; 103, second convex rib; 104, second recessed area; 105, third convex rib; 100, bottle embryo; 100', plastic bottle; 110, bottleneck; 120, bottle shoulder; 1201, wrinkles; 130, handle; 140, bottle body; 200, stretch rod; 1100, step structure; 1200, first groove; 1300, second groove; 1400, third groove. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] 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.

[0037] 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.

[0038] 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 3 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 material at the bottle body 140 first expands 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 material at the bottle body 140 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 material will be attached to the cavity wall of the mold cavity 10 together with the handle 130. After the blowing is completed, wrinkles 1201 are likely to appear at the connection between the bottle shoulder 120 and the neck 110 (such as Figure 3 As shown), resulting in quality defects.

[0039] like Figures 4 to 7As shown, the blow molding mold 1 of this embodiment has a mold cavity 10. After the bottle embryo 100 is blown, a bottleneck 110, a bottle shoulder 120, a handle 130 and a bottle body 140 are formed in the mold cavity 10. The bottle shoulder 120 is located between the bottleneck 110 and the bottle body 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 bottleneck 110. Both ends of the handle 130 can also be connected to the bottle shoulder 120. A first recessed area 101 is provided on the cavity wall of the mold cavity 10. The first recessed area 101 forms a raised step structure 1100 on the bottleneck 110.

[0040] The blow mold 1 of this embodiment is provided with a first recessed area 101 on the cavity wall of the mold cavity 10. The first recessed area 101 forms a raised step structure 1100 on the bottleneck 110, so that more blank material is occupied there, and wrinkles 1201 are prevented from appearing at the connection between the bottle shoulder 120 and the bottleneck 110, thereby improving the blowing quality of the bottle preform 100.

[0041] Preferably, at least one first convex rib 102 is provided on the cavity wall of the mold cavity 10, and the first convex rib 102 forms a first groove 1200 on the bottle shoulder 120. The first convex rib 102 can limit the movement of the blank at the bottle shoulder 120 toward the bottle neck 110, thereby further reducing the probability of the wrinkles 1201 appearing, and the first groove 1200 can also play a role in increasing the structural strength of the bottle shoulder 120. Due to the presence of the handle 130, the first convex rib 102 cannot form a closed ring, and thus the first groove 1200 is not a closed shape either.

[0042] Furthermore, the first convex rib 102 is disposed perpendicularly to the height direction of the bottle shoulder 120 , so that the first convex rib 102 can better prevent the blank at the bottle shoulder 120 from moving toward the bottle neck 110 .

[0043] Preferably, at least one second convex rib 103 is further provided on the cavity wall of the mold cavity 10, and the second convex rib 103 forms a non-closed or annularly closed second groove 1300 on the bottle body 140. The second convex rib 103 is preferably provided near the bottle shoulder 120, so that the second convex rib 103 can limit the movement of the blank at the bottle body 140 toward the bottle shoulder 120 and the handle 130, prevent the bottle shoulder 120 from wrinkling, and avoid the movement of the blank causing the position displacement of the handle 130. In addition, the second groove 1300 also plays a role in enhancing the structural strength of the bottle body 140. By providing multiple second convex ribs 103, multiple second grooves 1300 can be obtained, thereby greatly improving the structural strength of the bottle body 140 and making it less likely to deform.

[0044] Furthermore, the second convex rib 103 is arranged on a plane or the second convex rib 103 is arranged on the cavity wall of the mold cavity 10 in a wave shape, and the specific shape of the second convex rib 103 can be flexibly selected according to actual needs. Figure 8 and Fig. 9As shown, the second rib 103 is in a closed ring shape or an open arc shape, and the second rib 103 is arranged on a plane so that the height of each second groove 1300 is the same at all locations. Fig.10 and Fig.11 As shown, the second rib 103 is wavy, so that the second groove 1300 is also wavy, and each second groove 1300 is not at the same height.

[0045] When the number of the second ribs 103 is greater than two, the second ribs 103 may be arranged to be spaced apart from each other, or may be partially connected together. Fig.12 and Fig.13 As shown, each second rib 103 is partially connected, so that each second groove 1300 also partially overlaps.

[0046] like Figure 4 As shown, preferably, the mold cavity 10 includes a second recessed area 104, and the second recessed area 104 is used to accommodate the handle 130. The shape of the second recessed area 104 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.

[0047] like Figure 4 and Figure 7 As shown, in some embodiments, a third convex rib 105 is provided on the cavity wall of the mold cavity 10, and the third convex rib 105 forms a third groove 1400 at the connection between the bottle shoulder 120 and the bottle body 140. The third convex rib 105 plays a similar role to the second convex rib 103, and can also limit the movement of the blank at the bottle body 140 toward the bottle shoulder 120, thereby preventing the bottle shoulder 120 from wrinkling.

[0048] Preferably, Fig.14 As shown, the blow 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. Figure 1 and Figure 2 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 blow molding mold 1 is opened.

[0049] An embodiment of the present invention further provides a bottle blowing machine, comprising the blow molding mold 1 of any of the above embodiments, so that the bottle blowing machine can perform high-quality blow molding of a preform 100 with a handle 130 .

[0050] like Figure 7 , Fig. 9 , Fig.11 and Fig.13 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.

[0051] 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.

[0052] 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.

[0053] 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 bottle 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 the mold cavity includes a first concave area, and the first concave area forms a raised step structure on the bottle neck; At least one first convex rib is provided on the cavity wall of the mold cavity, and the first convex rib forms a first groove on the bottle shoulder; The first convex rib is arranged perpendicularly to the height direction of the bottle shoulder; At least one second convex rib is also provided on the cavity wall of the mold cavity, and the second convex rib forms a non-closed or annularly closed second groove on the bottle body.

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

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

4. The blow molding mold for a bottle 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.

5. A bottle blowing machine, characterized in that: A blow molding mold for a bottle preform with a handle as claimed in any one of claims 1 to 3.

6. A plastic bottle, characterized in that: Made by the bottle blowing machine described in claim 5.

7. The plastic bottle according to claim 6, characterized in that: The material of the plastic bottle is PET.

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