Bottle preform mold

Abstract

The utility model relates to a bottle preform mold, and belongs to the technical field of injection molding of packaging bottles. The bottle blank mold comprises a mold blank, the mold blank is provided with a cavity, an injection cavity and a pipe cavity which are communicated in sequence, a plurality of water grooves which are evenly formed in the radial direction of the mold blank at intervals are formed in the outer wall of the mold blank, and the water grooves are communicated with one another to form a water path surrounding the injection cavity. According to the scheme provided by the utility model, a balanced cooling effect can be provided for the cavity, the injection cavity and the pipe cavity through the water path, the cooling flow can be further increased through the water tanks, and the problems of whitening and wiredrawing of products are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bottle injection molding, in particular to a bottle blank mold. Background Art

[0002] In the preform injection molding process, in order to make the preform have a faster cooling speed in the mold cavity, it is generally necessary to have a water circulation design on the mold. However, the existing circulation design has a small cooling area and requires a long time to cool during the injection molding process. However, too long cooling time can easily make the product white and wire-drawing, resulting in bottle explosion during bottle blowing. Utility Model Content

[0003] In order to overcome the problems existing in the related technology, the utility model provides a bottle blank mold, which can provide a balanced cooling effect to the mold cavity, injection cavity and tube cavity through the water channel. The set water troughs can further increase the cooling flow rate and solve the problems of product whitening and wire drawing.

[0004] The utility model provides a bottle blank mold in a first aspect, including a mold blank, wherein the mold blank has a mold cavity, an injection cavity and a tube cavity which are connected in sequence, and a plurality of water grooves which are evenly arranged along the radial direction of the mold blank are arranged on the outer wall of the mold blank, and the plurality of water grooves are connected to each other to form a water path surrounding the injection cavity.

[0005] In a possible implementation of the first aspect above, an end surface of the water trough facing the injection cavity is arranged in an arc shape.

[0006] In a possible implementation of the first aspect above, an inner groove is formed on a side surface of the water tank close to the mold cavity.

[0007] In a possible implementation of the first aspect above, the distance between the water trough and the mold cavity is equal to the distance between the water trough and the tube cavity.

[0008] In a possible implementation of the first aspect above, the outer wall of the mold blank is provided with a first clamping groove and a second clamping groove arranged along its radial direction, the first clamping groove surrounds the mold cavity, and the second clamping groove surrounds the tube cavity.

[0009] In a possible implementation of the first aspect, a film fixing threaded hole is provided on the top end surface of the mold blank, and a limiting groove is further provided on the outer wall of the mold blank, and the limiting groove extends from the top end surface of the mold blank to the second clamping groove.

[0010] In a possible implementation of the first aspect above, the mold is made of alloy steel.

[0011] The technical solution provided by the utility model may have the following beneficial effects:

[0012] The utility model provides a bottle blank mold. When in use, the blank mold is installed on the fixed platen of the injection molding machine, and a plurality of water tanks are connected to the output end and the input end of the cooling system of the injection molding machine. After starting the injection molding, the injection molding machine drives the core to move into the cavity and the valve needle to move into the tube cavity, so that the injection port of the valve needle is inserted into the injection cavity. After the core and the valve needle are in place, the valve needle is controlled to inject molten plastic into the gap between the cavity and the core, and then the circulating cooling system is started, and the input end inputs the cooling medium into the water tank, and the cooling medium flows in the water tank and then returns to the cooling system. Under the action of the large flow cooling medium, the blank and the plastic in the cavity are quickly cooled, so that the consistency of the blank and the injection molded part during cooling and solidification is ensured, and the defects of whitening or drawing of the product are effectively avoided, so that the production cycle of the product can be reduced and the injection molding efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0014] Figure 1 It is a structural schematic diagram of a bottle blank mold shown in an embodiment of the utility model;

[0015] Figure 2 It is a top view of a preform mold shown in an embodiment of the utility model;

[0016] Figure 3 yes Figure 2 Cross-sectional view along line EE. Description of the drawings:

[0018] 1. Mold blank; 2. Cavity; 3. Injection cavity; 4. Tube cavity; 5. Water tank; 6. Inner groove; 7. First clamping groove; 8. Second clamping groove; 9. Film fixing threaded hole; 10. Limiting groove. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The existing single water hole circulation design has a small cooling area and requires a long time to cool during the injection molding process. However, if the cooling time is too long, the product may turn white or wire-drawn, which may lead to bottle explosion during bottle blowing.

[0023] In view of the above problems, an embodiment of the utility model provides a preform mold, which can provide a balanced cooling effect to the mold cavity 2, the injection cavity 3 and the tube cavity 4 through the water channel. The plurality of water troughs 5 provided can further increase the cooling flow rate and solve the problems of whitening and wire drawing of the product.

[0024] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a structural schematic diagram of a bottle blank mold shown in an embodiment of the utility model;

[0026] Figure 2 It is a top view of a preform mold shown in an embodiment of the utility model;

[0027] Figure 3 yes Figure 2 Cross-sectional view along line EE.

[0028] See also Figures 1 to 3 A bottle blank mold provided by an embodiment of the utility model includes a mold base 1, wherein the mold base 1 has a mold cavity 2, an injection cavity 3 and a tube cavity 4 which are connected in sequence, and a plurality of water grooves 5 which are evenly arranged along the radial direction of the mold base 1 are provided on the outer wall of the mold base 1, and the plurality of water grooves 5 are connected to each other to form a water path surrounding the injection cavity 3.

[0029] In actual application, production personnel install the preform mold with the corresponding cavity 2 structure in the fixed film plate of the injection molding machine according to the currently produced preform. After the injection molding machine is started, the core of the injection molding machine is driven by the drive system to move into the cavity 2. The gap between the core and the cavity 2 is the preform. When the core is in place, the drive system drives the valve needle to move into the tube cavity 4, and the injection port of the valve needle enters the injection cavity 3. The valve needle injects molten plastic into the cavity 2, and then starts the cooling system to inject cooling water into the water tank 5 for cooling, so that the plastic in the cavity 2 can be solidified and formed, and the temperature of the injection cavity 3 and the tube cavity 4 is reduced through the water channel to ensure a stable and consistent cooling effect, and avoid the plastic in the injection cavity 3 from drawing when the valve needle is detached due to uneven temperature.

[0030] In this embodiment, when the mold base is installed on the fixed mold plate of the injection molding machine, a plurality of water tanks 5 can be adaptively connected to the output end and the input end of the cooling system. After the water tanks 5 are connected to the output end and the input end of the cooling system, the cooling water of the cooling system can be filled in the water tanks 5 and then circulated.

[0031] In this embodiment, the number of water tanks 5 provided on the mold base 1 can be set according to the size of the product actually produced, and there is no sole limitation here.

[0032] In a preferred embodiment, the number of water grooves 5 can be set to 4. Specifically, the curvature of the groove of the water groove 5 can be set to 50°~60°, and the curvature between adjacent water grooves 5 is 30°~40°. Under this setting, the cooling flow and mechanical strength of the mold blank can be taken into account.

[0033] In this embodiment, water channels 5 are interconnected on the mold base 1 to form a water path surrounding the injection cavity 3, so that the molten plastic in the injection cavity 3 has a consistent cooling stroke under the action of cooling water, and several water channels 5 are interconnected, which can increase the flow rate of the water channel, accelerate the cooling stability of injection molding, and effectively improve the quality level of injection molding manufacturing.

[0034] In a possible implementation, the water tank 5 of the preform mold is arranged in an arc shape at one end thereof facing the injection cavity 3. The bottom of the water tank 5 (i.e., the end facing the injection cavity 3) is arranged in an arc shape, which can increase the contact area between the cooling water and the preform mold, further improve the cooling speed, and the arc-shaped surface formed by the water tank 5 protruding toward the injection cavity 3 can further reduce the distance between the injection cavity 3 and the water tank 5, thereby improving the cooling efficiency.

[0035] In a preferred embodiment, the arc-shaped structure formed at the bottom of the water tank 5 can be a hemispherical structure, and the arc angle formed by the two sides of the water tank 5 can be set to 45°, 60° and 75°. In a more preferred embodiment, the arc angle is 60°.

[0036] In a possible implementation manner, an inner groove 6 is formed on one side of the water tank 5 of the preform mold close to the cavity 2 .

[0037] In a possible embodiment, the distance between the water tank 5 of the preform mold and the cavity 2 is equal to the distance between the water tank 5 and the tube cavity 4. Under this setting, on the one hand, it can ensure that the water tank 5 has a consistent cooling efficiency for the cavity 2 and the tube cavity 4, and on the other hand, it can also ensure the overall strength of the preform 1.

[0038] Specifically, in a specific embodiment, the length of the mold 1 is 57.4 mm and the diameter is 83.8 mm, wherein the diameter of the cavity 2 is 56.48 mm, the maximum diameter of the injection cavity 3 is 6.37 mm, the minimum diameter is 4.02 mm, the minimum distance between the water trough 5 and the cavity 2 and the tube cavity 4 is 5 mm, the inner diameter of the water trough 5 is 25 mm, and the width of the water trough 5 is 10 mm.

[0039] In a possible implementation, the outer wall of the mold base 1 of the preform mold is provided with a first clamping groove 7 and a second clamping groove 8 arranged along its radial direction, the first clamping groove 7 surrounds the mold cavity 2, and the second clamping groove 8 surrounds the tube cavity 4. When the preform mold is installed on the fixed mold plate, the preform mold is positioned by the first clamping groove 7 and the second clamping groove 8 to avoid installation misalignment.

[0040] In a possible implementation, a film fixing threaded hole 9 is provided on the top end surface of the preform mold, and a limiting groove 10 is also provided on the outer wall of the preform, and the limiting groove 10 extends from the top end surface of the preform to the second clamping groove 8.

[0041] In a possible embodiment, the mold of the preform mold is made of alloy steel. When manufacturing the preform mold, cutting and drilling can be used.

[0042] Compared with the prior art, the bottle blank mold provided by the utility model has a plurality of water grooves 5 arranged on the mold base 1, and the water grooves 5 are interconnected to form a water path surrounding the injection cavity 3, so as to realize cooling of the injection cavity 3, the mold cavity 2 and the tube cavity 4 at the same time, and can ensure that different areas of each cavity have the same cooling effect, which can greatly speed up the production efficiency of injection molding.

[0043] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A preform mold, characterized in that: The mold base comprises a mold cavity, an injection cavity and a tube cavity which are connected in sequence. The outer wall of the mold base is provided with a plurality of water grooves which are evenly arranged along the radial direction of the mold base. The plurality of water grooves are connected to each other to form a water path surrounding the injection cavity.

2. The preform mold according to claim 1, characterized in that: One end surface of the water tank facing the injection cavity is arranged in an arc shape.

3. The preform mold according to claim 2, characterized in that: An inner groove is formed on one side of the water tank close to the cavity.

4. The preform mold according to claim 2, characterized in that: The distance between the water trough and the mold cavity is equal to the distance between the water trough and the tube cavity.

5. The preform mold according to claim 3, characterized in that: The outer wall of the mold base is provided with a first clamping groove and a second clamping groove arranged along its radial direction, the first clamping groove surrounds the mold cavity, and the second clamping groove surrounds the tube cavity.

6. The preform mold according to claim 5, characterized in that: A fixed die threaded hole is provided on the top end surface of the mold blank, and a limiting groove is also provided on the outer wall of the mold blank. The limiting groove extends from the top end surface of the mold blank to the second clamping groove.

7. The preform mold according to claim 1, characterized in that: The mould is made of alloy steel.

Images