Bottle blank capable of preventing material accumulation

Abstract

The utility model relates to the technical field of plastic bottle forming, in particular to an anti-material-accumulation bottle blank which is provided with an opening, the bottle blank comprises a head part, a blank neck, a blank body and a blank bottom which are coaxial and sequentially connected, the opening extends into the blank neck, the blank body and the blank bottom from the head part, the bottle blank is of a hollow structure, and the opening is provided with an opening. The section of the inner wall of the blank bottom along the central axis of the blank bottom is in a semi-oval shape. According to the scheme, the bottom of the bottle blank is semi-elliptical, so that the weight of the bottom can be reduced, accumulated materials at the bottom during bottle blowing are reduced, and the processing cost is reduced; meanwhile, the weight of the bottom can be reduced, the weight is increased to the blank body of the bottle blank, the bottle blowing process is simplified, and the reject ratio of products is reduced. By further adjusting the specific size of the blank bottom, the arrangement of the traditional bottle blank bottom is changed, material accumulation at the blank bottom can be further avoided, the weight of the bottle blank is reduced, and more raw materials are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic bottle molding, in particular to a bottle blank capable of preventing material accumulation. Background Art

[0002] PET preforms are a widely used injection molding product. The preforms are formed by injection molding, and then the PET preforms are processed again by blow molding to form plastic bottles. They are widely used in packaging fields such as cosmetics, medicines, and beverages.

[0003] However, the bottom of traditional PET preforms is mostly semicircular, which makes it easy for the preforms to accumulate during the subsequent blow molding process. In addition, the bottom of traditional PET preforms is heavy, which limits the total amount of preforms on the one hand and the blowing process on the other. Utility Model Content

[0004] The utility model aims to provide a bottle blank for preventing material accumulation, aiming to solve the technical problems that the existing bottle blank has a semicircular bottom which is prone to material accumulation and the bottom of the bottle blank is heavy which limits the bottle blowing process.

[0005] To achieve the above-mentioned purpose, the utility model provides a bottle blank for preventing material accumulation, which has an opening. The bottle blank includes a head, a neck, a body and a bottom that are coaxial and connected in sequence. The opening extends from the head to the inside of the neck, the body and the bottom, so that the bottle blank has a hollow structure, and the cross-section of the inner wall of the bottom along its axis is semi-elliptical.

[0006] Preferably, the cross section of the inner wall of the blank bottom along its axis includes a first inner arc segment and a second inner arc segment, the center of the first inner arc segment is located on the center line of the bottle blank, the two ends of the first inner arc segment are respectively connected to the ends of the two second inner arc segments, and the head ends of the two second inner arc segments are respectively connected to the two sides of the inner wall of the blank body;

[0007] The cross section of the outer wall of the bottom of the billet along its axis includes a first outer arc segment and a second outer arc segment, the center of the first outer arc segment coincides with the center of the first inner arc segment, the two ends of the first outer arc segment are respectively connected to the ends of the two second outer arc segments, and the head ends of the two second outer arc segments are respectively connected to the two sides of the outer wall of the billet body;

[0008] The length of the outer wall of the bottom of the blank is L 外 The diameter of the outer wall of the bottom of the blank is D 外 , L 外 =D 外 ×a, a is the default value.

[0009] Preferably, the radius of the first outer arc segment is R 外1 , R 外1=D 外 ×b, b is the preset value.

[0010] Preferably, the distance between the first outer arc segment and the first inner arc segment is the first wall thickness B1, the distance between the second outer arc segment and the second inner arc segment is the second wall thickness B2, and B1:B2=1:(1.05-1.2).

[0011] Preferably, the wall thickness of the blank bottom is less than the wall thickness of the blank body.

[0012] Preferably, the wall thickness of the blank neck gradually increases from a side close to the head to a side far from the head.

[0013] Preferably, the outer wall of the head is provided with a plurality of external threads for cooperating with the external cover body.

[0014] Preferably, the outer wall of the head is further provided with a convex ring, and the convex ring is located at the rear side of the external thread.

[0015] Preferably, the connection between the inner wall of the head and the inner wall of the billet neck, the connection between the inner wall of the billet neck and the inner wall of the billet body, and the connection between the inner wall of the billet body and the inner wall of the billet bottom all have arc-shaped transitions.

[0016] The utility model discloses a bottle blank for preventing material accumulation, which has the following beneficial effects:

[0017] 1. This solution can reduce the weight of the bottom by setting the bottom of the bottle blank into a semi-elliptical shape, reduce the material accumulation at the bottom during bottle blowing, and reduce the processing cost; at the same time, it can also reduce the weight of the bottom and add the weight to the body of the bottle blank, simplifying the bottle blowing process, reducing the product failure rate, and facilitating industrial production.

[0018] 2. By further limiting the relationship between the length of the outer wall of the bottom of the blank and its diameter, the relationship between the radius of the first outer arc segment and the diameter of the outer wall of the bottom of the blank, and the relationship between the first wall thickness and the second wall thickness, the specific setting of the bottom of the traditional bottle blank is changed, which can further avoid material accumulation at the bottom of the blank, reduce the weight of the bottle blank, and save more raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1It is a schematic diagram of the cross-sectional structure of the bottle blank for preventing material accumulation of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the bottle blank for preventing material accumulation of the utility model;

[0022] Figure 3 The top view of the bottle blank for preventing material accumulation of the utility model is shown in FIG.

[0023] In the accompanying drawings: 1-opening, 11-external thread, 12-convex ring, 2-head, 3-blank neck, 4-blank body, 5-blank bottom, 51-first inner arc segment, 52-second inner arc segment, 53-first outer arc segment, 54-second outer arc segment.

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that if a directional indication is involved in the embodiments of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] like Figures 1 to 3As shown, a bottle blank for preventing material accumulation has an opening 1. The bottle blank includes a head 2, a neck 3, a body 4 and a bottom 5 which are coaxial and connected in sequence. The opening 1 extends from the head 2 to the inside of the neck 3, the body 4 and the bottom 5, so that the bottle blank has a hollow structure. The cross-section of the inner wall of the bottom 5 along its axis is semi-elliptical.

[0029] In this solution, the bottom of the plastic bottle (PET) preform is set to be semi-elliptical, which can reduce the weight of the bottom, reduce the accumulation of materials at the bottom during bottle blowing, and reduce the processing cost. In addition, the elliptical bottom 5 of the PET preform can reduce the weight of the bottom and add the weight to the body 4 of the preform, so that the bottle blowing process can be simplified and the defective rate of the product can be reduced.

[0030] Furthermore, if Figure 2 As shown, the cross section of the inner wall of the blank bottom 5 along its axis includes a first inner arc segment 51 and a second inner arc segment 52, the center of the first inner arc segment 51 is located on the center line of the bottle blank, the two ends of the first inner arc segment 51 are respectively connected to the ends of the two second inner arc segments 52, and the head ends of the two second inner arc segments 52 are respectively connected to the two sides of the inner wall of the blank body 4;

[0031] The cross section of the outer wall of the blank bottom 5 along its axis includes a first outer arc segment 53 and a second outer arc segment 54, the center of the first outer arc segment 53 coincides with the center of the first inner arc segment 51, the two ends of the first outer arc segment 53 are respectively connected to the ends of the two second outer arc segments 54, and the head ends of the two second outer arc segments 54 are respectively connected to the two sides of the outer wall of the blank body 4;

[0032] The length of the outer wall of the bottom 5 is L 外 The diameter of the outer wall of the bottom 5 is D 外 , L 外 =D 外 ×a, a is a preset value (a can be 0.6-0.8, such as a is 0.7).

[0033] This solution lengthens the bottom of the PET bottle blank and makes it into a design with two tangent arcs, including a first arc segment and a second arc segment, which are further divided into a first inner arc segment 51 and a second inner arc segment 52, a first outer arc segment 53 and a second outer arc segment 54 according to the inner and outer distribution of the bottle blank. In particular, in this embodiment, the length of the outer wall of the blank bottom 5 = the diameter of the outer wall of the blank bottom 5 × 0.7, such as the length of the outer wall of the blank bottom 5 = the diameter of the outer wall of the blank bottom 5 × 0.7 = 25.9 × 0.7 mm = 18.13 mm. In this way, the specific shape of the 5 parts of the traditional bottle blank bottom is changed, the plastic distribution of the plastic bottle after blow molding is improved, the accumulation of materials in the 5 parts of the bottle blank bottom is avoided, the weight of the bottle blank is reduced, and raw materials are saved.

[0034] Furthermore, the radius of the first outer arc segment 53 is R 外1 , R 外1 =D 外 × b, b is a preset value (b can be 0.4-0.5, such as b is 0.41). The above design can further improve the problem of material accumulation at the bottom of the blow bottle and save raw materials. For example, in actual production, the radius of the first outer arc segment 53 = the diameter of the outer wall of the blank bottom 5 × 0.41 = 25.9 × 0.41 = 10.62 mm.

[0035] Furthermore, the distance between the first outer arc segment 53 and the first inner arc segment 51 is the first wall thickness B1, the distance between the second outer arc segment 54 and the second inner arc segment 52 is the second wall thickness B2, B1:B2=1:1.05-1.2, specifically 1:1.09. Figure 2 As shown, the thickness of the blank bottom 5 is not completely uniform, and the first wall thickness is smaller than the second wall thickness, that is, the bottom end of the blank bottom 5 is relatively thinner, which ensures that the thickness distribution of the blank bottom 5 is reasonable, effectively improves the problem of material accumulation at the bottom 5 of the bottle blank during blow molding, and also saves materials.

[0036] For example, in actual production, the first wall thickness = the radius of the first outer arc segment 54 - the radius of the first inner arc segment 52 = 10.62-8.49 = 2.13 mm, the second wall thickness = the radius of the second outer arc segment - the radius of the second inner arc segment 51 = 24.65-22.32 = 2.32 mm; the ratio of the first wall thickness to the second wall thickness is approximately 1:1.09.

[0037] Through the above arrangement, the structural arrangement of the blank bottom 5 is different from that of the conventional bottle blank, and the weight reduction of the blank bottom 5 is different. The blank bottom 5 of this solution is at least 0.35g lighter than the conventional bottle blank bottom 5.

[0038] Furthermore, the wall thickness of the blank bottom 5 is less than the wall thickness of the blank body 4. In order to reduce the weight of the blank, the wall thickness of the blank bottom 5 in this solution is smaller than the thickness of the blank body 4, which can further reduce the total weight of the bottle blank and is beneficial to the subsequent bottle blowing process.

[0039] Furthermore, the wall thickness of the blank neck 3 gradually increases from the side close to the head 2 to the side far from the head 2. The blank neck 3 corresponds to the neck of the plastic bottle after blow molding. Since this area of ​​the plastic bottle is not easy to be stretched and is prone to material accumulation, the material in this area should be reduced as much as possible. By setting the wall thickness of the blank neck 3 to gradually increase, the accumulation of plastic in the neck of the plastic bottle can be reduced, thereby achieving lightweighting of the bottle blank.

[0040] Furthermore, the outer wall of the head 2 is provided with a plurality of external threads 11 for cooperating with the outer cover. Figure 2As shown, the head 2 becomes the bottle top of the plastic bottle after blow molding, and needs to cooperate with the cover body to achieve a sealing effect when containing items. Therefore, the external thread 11 outside the head 2 can be threadedly connected with the cover body.

[0041] Furthermore, the outer wall of the head 2 is also provided with a convex ring 12, and the convex ring 12 is located at the rear side of the external thread 11. The convex ring 12 integrally formed on the outer wall of the head 2 has a tightening and limiting function, and the convex ring 12 helps to support and fix the preform in the mold during the blow molding process. In actual production, the convex ring 12 is located at the relatively lower side of the head 2.

[0042] Furthermore, the connection between the inner wall of the head 2 and the inner wall of the blank neck 3, the connection between the inner wall of the blank neck 3 and the inner wall of the blank body 4, and the connection between the inner wall of the blank body 4 and the inner wall of the blank bottom 5 are all in an arc-shaped transition. The arc-shaped transition between the connection sections of the head 2, the blank neck 3, the blank body 4 and the blank bottom 5 allows the thickness of the entire bottle blank to change more evenly, reduces the occurrence of material accumulation, and reduces the processing cost.

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A bottle blank for preventing accumulation of material, having an opening (1), characterized in that: The bottle blank comprises a head (2), a neck (3), a body (4) and a bottom (5) which are coaxial and connected in sequence, the opening (1) extends from the head (2) to the inside of the neck (3), the body (4) and the bottom (5), so that the bottle blank has a hollow structure, and the inner wall of the bottom (5) has a semi-elliptical cross section along its axis. The cross section of the inner wall of the blank bottom (5) along its axis comprises a first inner arc segment (51) and a second inner arc segment (52), the center of the first inner arc segment (51) is located on the center line of the bottle blank, the two ends of the first inner arc segment (51) are respectively connected to the ends of the two second inner arc segments (52), and the head ends of the two second inner arc segments (52) are respectively connected to the two sides of the inner wall of the blank body (4); The cross section of the outer wall of the blank bottom (5) along its axis comprises a first outer arc segment (53) and a second outer arc segment (54), the center of the first outer arc segment (53) coincides with the center of the first inner arc segment (51), the two ends of the first outer arc segment (53) are respectively connected to the ends of the two second outer arc segments (54), and the head ends of the two second outer arc segments (54) are respectively connected to the two sides of the outer wall of the blank body (4); The length of the outer wall of the bottom (5) is L 外 The diameter of the outer wall of the bottom (5) is D 外 , L 外 =D 外 ×a, a is the default value.

2. The anti-material accumulation bottle blank according to claim 1, characterized in that: The radius of the first outer arc segment (53) is R 外1 , R 外1 =D 外 ×b, b is the preset value.

3. The bottle blank for preventing material accumulation according to claim 2, characterized in that: The distance between the first outer arc segment (53) and the first inner arc segment (51) is the first wall thickness B1, and the distance between the second outer arc segment (54) and the second inner arc segment (52) is the second wall thickness B2, B1:B2=1:(1.05-1.2).

4. The anti-material accumulation bottle blank according to claim 1, characterized in that: The wall thickness of the blank bottom (5) is less than the wall thickness of the blank body (4).

5. The bottle blank for preventing material accumulation according to claim 1, characterized in that: The wall thickness of the blank neck (3) gradually increases from a side close to the head (2) to a side far from the head (2).

6. The bottle blank for preventing material accumulation according to claim 1, characterized in that: The outer wall of the head (2) is provided with a plurality of external threads (11) for cooperating with the external cover body.

7. The bottle blank for preventing material accumulation according to claim 6, characterized in that: The outer wall of the head (2) is also provided with a convex ring (12), and the convex ring (12) is located at the rear side of the external thread (11).

8. The bottle blank for preventing material accumulation according to claim 1, characterized in that: The connection between the inner wall of the head (2) and the inner wall of the billet neck (3), the connection between the inner wall of the billet neck (3) and the inner wall of the billet body (4), and the connection between the inner wall of the billet body (4) and the inner wall of the billet bottom (5) all have arc-shaped transitions.

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