Primary mold for forming circular glass bottle container

Abstract

An initial mold for forming a round glass bottle container comprises a female half mold and a male half mold, an inner cavity for forming a glass bottle container initial blank is formed after the two half molds are closed, the middle section of the inner cavity is a thickness correction area, and the horizontal section of the thickness correction area is an arc line protruding outwards at the joint closing position of the two half molds to replace a conventional arc shape. The glass bottle can primary blank located in the thickness correction area protrudes outwards in the seam closing area, and the thickness of the glass bottle can primary blank in the seam closing area is larger than that of other parts; the horizontal included angle theta corresponding to the center of the section of the inner cavity and the arc line ranges from 0 degree to 180 degrees, and the rest part of the thickness correction area can be an arc line. On the basis that the shape and the size of the glass bottle container are not influenced, the wall thickness of the joint of the round glass bottle container is kept consistent with that of other areas, the uniformity of the whole thickness is finally realized, the qualified strength can be achieved under the condition that the bottle weight is not increased, and meanwhile, the glass bottle container is suitable for primary blanks of a blowing method and a pressing-blowing method.

Description

TECHNICAL FIELD

[0001] The utility model relates to glass bottle and jar forming technical field, especially a kind of for circular glass bottle and jar forming preliminary mould. BACKGROUND

[0002] Circular glass bottle and jar (such as infusion bottle, beer bottle, food jar etc.) generally exist the phenomenon that wall thickness becomes small in joint area, leading to unqualified internal pressure strength and impact strength, and easily broken.The generation mechanism of this phenomenon is obscure and complex, and the main reason is that preliminary mould is composed of two half-moulds, such as Figure 1 、 Figure 2 The internal cavity of two half-moulds is formed into preliminary embryo, and the horizontal section of internal cavity is generally circular, and joint area (joint area 2) around internal cavity is easily collided and worn in opening and closing process of two half-moulds, preliminary mould base material is generally cast iron, and it is good in thermal conductivity, but low in hardness, in order to improve wear resistance, such as Figure 1 、 Figure 2 Nickel-based alloy is added in joint area (joint area 2) around internal cavity, and the hardness of nickel-based alloy is high, but its thermal conductivity is lower than that of cast iron, leading to higher temperature of joint area of preliminary embryo 3, when preliminary embryo is transferred to film forming internal cavity, and in the process that preliminary embryo fills film forming internal cavity, the extension and stretching range of preliminary embryo in joint area is larger, so the wall thickness of glass bottle and jar formed finally is smaller in joint area.In prior art, in order to overcome the problem that the wall thickness of glass bottle and jar in joint line is smaller, leading to insufficient pressure resistance and impact strength, the most common and simple solution is to increase the overall thickness and weight of glass bottle and jar, so that the wall thickness of entire glass bottle is uniformly increased, to reach qualified strength, but its disadvantage is to increase material cost and transportation cost, which is contrary to the light weight of glass bottle. CONTENT OF UTILITY MODEL

[0003] The utility model aims at overcoming the above-mentioned shortcomings of prior art, and provides a kind of for circular glass bottle and jar forming preliminary mould, which can realize uniform glass bottle wall and reduce wall thickness.

[0004] The utility model is realized by the following technical solutions:

[0005] A kind of for circular glass bottle can forming initial mould, including female and male mould, the internal cavity of glass bottle initial blank forming is formed after two half moulds are closed, the internal cavity is divided into upper section, middle section and lower section, and the middle section is thickness correction area, the horizontal section of the thickness correction area is modified as the arc line that is outward convex on the basis of conventional circular track at the joint position of two half moulds, instead of conventional circular arc, so that the glass bottle initial blank located in thickness correction area is outward convex at joint area, and the thickness of glass bottle initial blank at joint area is greater than other parts.In the conventional design, the horizontal section of internal cavity is circular, the trajectory of the utility model is modified on the basis of conventional circle at joint position, deviates from the original circular trajectory outward, so that it is farther from the center of internal cavity, so that the thickness of initial blank at joint is greater than other regions when initial blank is formed, whether it is pressure blow method or blow blow method, and it is outward convex at joint area.

[0006] Further, the arc line is a symmetric shape with the joint line as the axis, i.e., the arc line itself is axisymmetric.

[0007] Further, the two joint positions of the two half moulds are outward convex arc lines, and the two arc lines are mutually symmetric, i.e., there are two joint positions when the two half moulds are closed, corresponding to two arc lines, and the two arc lines are mutually symmetric.

[0008] Further, the horizontal included angle of the arc line corresponding to the cross-sectional center of the internal cavity is θ, 0 < θ < 180°. The arc line is a modification of the existing circular arc, so the range covered by the arc line corresponds to the central angle of the original circular arc. The range covered by the arc line can be designed according to product size, thickness, material, forming process, etc., so the size of the horizontal included angle of the arc line should also be designed according to the specific product, and the range is 0-180°, preferably 0-60°.

[0009] Further, the remaining part of the horizontal section of the thickness correction area is a circular arc, and at the intersection of the arc line and the circular arc, the tangent of the arc line coincides with the tangent of the circular arc, i.e., the arc line and the circular arc intersect at the tangent, smoothly transition, the inner surface of the internal cavity is a continuous and smooth curved surface, and there is no intersection line or crease on the initial blank. The boundary between the arc line and the circular arc can also be connected by a circular arc, an elliptical arc, a parabola or a smooth curve, so that the offset amount of the arc line gradually becomes 0, and the curved surface formed by the arc line is tangent to the surrounding curved surface. The purpose is to make there be no obvious crease on the initial blank, otherwise it will be shown on the glass bottle. The 3D model can be imported into a CNC machining center for processing.

[0010] Further, the circular arc line takes the center of the cross section of the internal cavity as the center, the radius corresponding to the circular arc line is R, the intersection of the arc line and the joint line is the maximum correction point, the distance between the maximum correction point and the center is L, L>R, the difference between L and R is the thickness correction value K, 0<K<0.05R. The maximum correction point deviates from the original circular trajectory the farthest, in order to control the final thickness of the glass bottle to be consistent, the maximum correction point should be controlled within a certain range, that is, the distance of the arc line deviating from the original circular arc line should be controlled within a certain range, the deviation distance should be designed according to the size, shape, weight and capacity of each bottle, the principle is to make the corresponding compensation according to the actual wall thickness distribution law. The glass bottle can be cut at different height positions to obtain the wall thickness distribution at different heights, and the arc line at the joint of different cross sections is compensated and designed.

[0011] Further, the horizontal angle corresponding to the arc line is θ, which is 180°, that is, all the original circular trajectories are compensated and designed into an integral arc line.

[0012] Further, the arc line is an elliptical arc line, and the elliptical arc lines at the two joint positions of the two half molds are connected into an ellipse, and the long axis of the ellipse coincides with the joint line. It can also be other types of arc lines, such as a parabola.

[0013] Further, the ratio of the long axis length to the short axis length of the ellipse is e, 1<e<1.1.

[0014] Further, the upper edge of the thickness correction area is located below the bottle neck of the internal cavity, and the lower edge of the thickness correction area is located above the bottle bottom of the internal cavity. The closer to the upper and lower edges, the smaller the deviation amount of the arc line, until the deviation amount gradually becomes zero, and coincides with the circular trajectory of the bottle neck and the bottle bottom part.

[0015] The utility model is designed on the basis that the cross section of the internal cavity of the existing primary mold is circular, the circular arc trajectory at the position close to the joint line of the primary mold is corrected into an arc line deviating from the circular arc line, and deviates from the center of the internal cavity of the primary mold in the direction away from the center, so that the thickness of the glass bottle blank formed by the primary mold deviates from the joint area and protrudes outward, so that when the blank is further formed in the forming mold, the distance between the joint area of the blank and the internal cavity of the forming mold becomes smaller, the stretching range of the glass becomes smaller, even if the temperature of the joint area is higher, the difference in thickness and distance can offset the difference in temperature, so that the final wall thickness is consistent with other areas, the thickness of the entire glass bottle is uniform and consistent, and the circular shape and size of the finally formed glass bottle are not affected. This design can make the wall thickness distribution uniform in the transverse direction without increasing the weight of the bottle, so as to achieve qualified internal pressure strength and impact strength, and has wide applicability, which can be applied to the blanks of both blow-blow method and pressure-blow method, and has a positive significance for promoting green environmental protection and economic glass packaging lightweight. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Structure diagram of the conventional preliminary mold.

[0017] Figure 2 Structure diagram of the conventional preliminary mold and the preliminary embryo.

[0018] Figure 3 Structure diagram of the conventional preliminary embryo forming.

[0019] Figure 4 Structure diagram of the internal cavity of the preliminary mold.

[0020] Figure 5 Structure diagram of the preliminary embryo in the mold. Figure 4 Structure diagram of the cross section at A-A.

[0021] Figure 6 Horizontal cross-sectional view (a) and front cross-sectional view (b) of the conventional preliminary embryo in the mold.

[0022] Figure 7 Front cross-sectional view of the preliminary embryo in the mold.

[0023] Figure 8 Structure diagram of the preliminary embryo in the mold. Figure 7 Structure diagram of the cross section at B-B.

[0024] Figure 9 Front view diagram of the preliminary embryo in the mold.

[0025] Figure 10 Three-dimensional view diagram of the preliminary embryo in the mold.

[0026] Figure 11 Structure diagram of the preliminary embryo and the glass bottle in the embodiment 1 of the present utility model.

[0027] Figure 12 Horizontal cross-sectional view (a) and front cross-sectional view (b) of the preliminary mold in the embodiment 1 of the present utility model.

[0028] Figure 13 Structure diagram of the preliminary embryo and the glass bottle in the embodiment 2 of the present utility model.

[0029] Figure 14 Horizontal cross-sectional view (a) and front cross-sectional view (b) of the preliminary mold in the embodiment 2 of the present utility model.

[0030] Figure 15 Structure diagram of the preliminary embryo and the glass bottle in the embodiment 3 of the present utility model.

[0031] Figure 16 Horizontal cross-sectional view (a) and front cross-sectional view (b) of the preliminary mold in the embodiment 3 of the present utility model.

[0032] Figure labels: 1-Preliminary mold; 2-Seam area; 3-Preliminary blank; 4-Core pressing; 5-End cap; 6-Mold opening; 7-Mold forming; 8-Bottom mold; 9-Mold forming inner cavity; 10-Seam line; 11-Arc line; 12-Circular arc line; 13-Original circular trajectory; 14-Thickness correction area; 15-Internal cavity; 16-Glass bottle. Detailed Implementation

[0033] A preliminary mold 1 for forming round glass bottles and jars, such as Figure 1 , Figure 2 Including two half-molds, yin and yang, such as Figure 3 After the two half molds are joined, the internal cavity 15 of the glass bottle / jar preform 3 is formed. The internal cavity 15 is divided into an upper section, a middle section, and a lower section, as shown below. Figure 4 , Figure 5 The middle section is the thickness correction zone 14. The horizontal cross section of the thickness correction zone 14 is modified into an outwardly convex arc line 11 at the joint position of the two halves of the mold, based on the original circular trajectory 13, replacing the conventional arc (original circular trajectory 13). This makes the glass bottle preform 3 located in the thickness correction zone 14 convex outward in the joint area 2, and the thickness of the glass bottle preform 3 in the joint area 2 is greater than that of other parts.

[0034] like Figure 6 In the conventional design, the horizontal cross-section of the internal cavity 15 is circular, and the joint area 2 corresponds to the arc 12, such as... Figure 7 , Figure 8 This invention modifies the trajectory of a conventional circular shape at the seam, deviating it outward from the original circular trajectory 13, thus making it farther from the center of the internal cavity 15. Therefore, during the forming of the initial blank 3, whether by pressure blowing or blow blowing, the thickness of the initial blank 3 at the seam is greater than in other areas, causing it to bulge outward in the seam area 2. Figure 3 Taking the blow molding method shown as an example, the internal cavity 15 formed by the initial mold 1, together with the end cap 5 and the die 6, forms the internal space for the initial blank 3. Under the action of the core 4, the external contour of the initial blank 3 is determined by the shape of the internal space formed by the combination of the internal cavity 15 formed by the initial mold 1, the end cap 5, and the die 6. Thus, as shown... Figure 9 , Figure 10 When the initial blank 3 is transferred to the mold 7, the bottom of the mold 7 is fitted by the bottom mold 8 to form the mold cavity 9. During the process of the initial blank 3 filling the mold cavity 9 under the action of air blowing, as... Figure 7 , Figure 8(arrow direction in the figure is the direction and path of the movement of the initial embryo 3), because the distance between the joint area 2 of the initial embryo 3 and the inner cavity of the mold 7 is smaller than the distance between other areas and the inner cavity of the mold 7, even if the joint area 2 has a higher temperature and the material has a higher flowability, the extension and stretching range of the joint area 2 will be smaller than that of the conventional design, and the increase in the thickness of the joint area 2 will further offset the decrease in the thickness of the final molded product caused by the temperature deviation, so that the final wall thickness of the joint area 2 is consistent with that of other areas.

[0035] As Figure 5 , the arc line 11 is a symmetrical shape with the joint line 10 as the axis, that is, the arc line 11 itself is axisymmetric. The two joint positions of the two mold halves are both outwardly convex arc lines 11, and the two arc lines 11 are mutually symmetrical, that is, when the two mold halves are closed, there are two joint positions corresponding to two arc lines 11, and the two arc lines 11 are mutually symmetrical.

[0036] As Figure 4 , the upper edge of the thickness correction area 14 is located below the neck of the internal cavity 15, and the lower edge of the thickness correction area 14 is located above the bottom of the internal cavity 15. The closer to the upper and lower edges, the smaller the deviation of the arc line 11, until the deviation gradually becomes zero, coinciding with the circular trajectory of the neck and bottom parts.

[0037] As one of the embodiments, as Figure 5 , the horizontal included angle between the arc line 11 and the center of the cross section of the internal cavity 15 is θ, 0<θ<180°, preferably 0-60°. The rest of the horizontal cross section of the thickness correction area 14 is a circular arc line 12, and at the intersection of the arc line 11 and the circular arc line 12, the tangent line of the arc line 11 coincides with the tangent line of the circular arc line 12, that is, the arc line 11 and the circular arc line 12 intersect at the tangent line, smoothly transition, and the inner surface of the internal cavity 15 is a continuous and smooth curved surface, without intersection lines or creases on the initial embryo 3.

[0038] The circular arc line 12 has the center of the cross section of the internal cavity 15 as the center, and the radius corresponding to the circular arc line 12 is R. The intersection of the arc line 11 and the joint line 10 is the maximum correction point, and the distance between the maximum correction point and the center is L, L>R. Let the difference between L and R be the thickness correction value K, 0<K<0.05R.

[0039] As another implementation, the horizontal included angle θ corresponding to the arc line 11 is 180°, that is, the entire original circular trajectory 13 is compensated and designed into an integrally connected arc line 11. The arc line 11 is an elliptical arc line 12, and the elliptical arc lines 12 at the two joint positions of the two half-molds are connected into an ellipse, and the long axis of the ellipse coincides with the joint line 10. The ratio of the length of the long axis to the length of the short axis of the ellipse is e, where 1 < e < 1.1. It can also be other types of arc lines 11, such as parabolas.

[0040] Example 1

[0041] In this example, as Figure 11 shown, the final product is an infusion bottle 16 with 28 ports and a volume of 50 mL, with a weight of 75 g, a bottle height of 78.1 mm, and a maximum diameter of φ46 mm. The size design of the internal cavity 15 of the primary mold 1 is as Figure 12 shown. The height of the internal cavity 15 is 62 mm, the height of the thickness correction area 14 is 41 mm, the upper edge of the thickness correction area 14 is 15 mm away from the top of the internal cavity 15, and the upper edge is 6 mm away from the bottom of the internal cavity 15.

[0042] In the original design, the horizontal cross-section of the internal cavity 15 of the primary mold 1 is circular, and the horizontal cross-section diameter of the circular cross-section of the thickness correction area 14 is between 12 - 16 mm. In this example, the horizontal cross-section of the internal cavity 15 consists of an arc line 12 and an outwardly convex arc line 11. The arc line 11 is symmetric about the joint line 10, and the two end arc lines 11 are symmetric to each other. The central angle corresponding to the arc line 11 is 60°. The arc line 12 is the corresponding arc line 12 in the original design, with a radius R. The intersection point of the arc line 11 and the joint line 10 is the maximum correction point F. The distance between the maximum correction point F and the center O is L, where L > R. Let the difference between L and R be the thickness correction value K, and K varies with the cross-section diameter D, with a variation range between 0 - 0.4. Along the direction extending from the maximum correction point gradually towards the arc line 12, the deviation between the arc line 11 and the original arc line 12 changes from K to 0 until it is connected to the arc line 12.

[0043] Example 2

[0044] In this example, as Figure 13 shown, the final product is an infusion bottle 16 with 28 ports and a volume of 125 mL, with a weight of 125 g, a bottle height of 110.2 mm, and a maximum diameter of φ53 mm. The size design of the internal cavity 15 of the primary mold 1 is as Figure 14 shown. The height of the internal cavity 15 is 89 mm, the height of the thickness correction area 14 is 67.5 mm, the upper edge of the thickness correction area 14 is 15 mm away from the top of the internal cavity 15, and the upper edge is 6.5 mm away from the bottom of the internal cavity 15.

[0045] In the original design, the horizontal cross-section of the internal cavity 15 of the initial mold 1 is circular, and the diameter of the horizontal cross-section of the thickness correction zone 14 is between 12-18mm. In this embodiment, the horizontal cross-section of the internal cavity 15 is composed of a circular arc 12 and an outwardly protruding arc 11. The arc 11 is symmetrical about the seam line 10 as the axis, and the two ends of the arc 11 are symmetrical to each other. The central angle corresponding to the arc 11 is 60°. The circular arc 12 is the same as the circular arc 12 in the original design, with a radius R. The intersection of the arc 11 and the seam line 10 is the maximum correction point F. The distance between the maximum correction point F and the center O is L, where L>R. Let the difference between L and R be the thickness correction value K. K varies with the cross-sectional diameter D, ranging from 0 to 0.45. Along the direction of the arc 11 extending towards the circular arc 12 from the maximum correction point, the deviation between the arc 11 and the original circular arc 12 gradually changes from K to 0 until it connects with the circular arc 12.

[0046] Example 3

[0047] In this embodiment, as Figure 15 As shown, the final product is a 1000mL beverage bottle (glass bottle 16), weighing 470g, with a height of 216.5mm and a maximum diameter of φ97.3mm. The dimensions of the internal cavity 15 of the initial mold 1 are designed as follows... Figure 16 As shown, the height of the internal cavity 15 is 156mm, the height of the thickness correction area 14 is 124.5mm, the upper edge of the thickness correction area 14 is 8mm from the top of the internal cavity 15, and the upper edge is 23.5mm from the bottom of the internal cavity 15.

[0048] The original design of the initial mold 1 has a circular horizontal cross-section of the internal cavity 15 with a maximum radius of 25mm. In this embodiment, the internal cavity 15 has an elliptical horizontal cross-section. The minor axis of the ellipse is the diameter of the circle in the original design. The major axis of the ellipse coincides with the seam line 10. The distance between the endpoint of the major axis and the upper point of the circle in the original design is the correction value K. That is, K is the difference between the distance from the endpoint of the major axis to the center of the ellipse and the distance from the endpoint of the minor axis to the center of the ellipse. K varies with the diameter of the cross-section and ranges from 0 to 0.6. The ratio of the major axis to the minor axis of the ellipse is e, and the corresponding e value is between 1 and 1.03.

[0049] The above detailed description is a specific description of a feasible embodiment of the present utility model. This embodiment is not intended to limit the patent scope of the present utility model. All equivalent implementations or modifications that do not depart from the present utility model should be included in the patent scope of this case.

Claims

1. A preliminary mold for forming round glass bottles and jars, characterized in that, The system includes two half-molds, a male and a female. After the two half-molds are joined together, they form an internal cavity for the initial glass bottle / jar blank. The internal cavity is divided into an upper section, a middle section, and a lower section. The middle section is a thickness correction zone. The horizontal cross-section of the thickness correction zone is modified from a conventional circular trajectory to an outwardly convex arc at the joint of the two half-molds. This causes the glass bottle / jar blank located in the thickness correction zone to convex outward in the joint area, and the thickness of the glass bottle / jar blank in the joint area is greater than that in other parts.

2. The initial mold for forming circular glass bottles and jars according to claim 1, characterized in that, The arc-shaped line is a symmetrical shape with the seam line as its axis.

3. The initial mold for forming circular glass bottles and jars according to claim 1, characterized in that, Both seam locations of the two halves of the mold have outward-protruding arc-shaped lines, and the two arc-shaped lines are symmetrical to each other.

4. The initial mold for forming circular glass bottles and jars according to claim 1, characterized in that, The horizontal angle corresponding to the arc is θ, where 0 < θ < 180°.

5. A preliminary mold for forming circular glass bottles and jars according to claim 4, characterized in that, The remaining portion of the horizontal cross-section of the thickness correction zone is an arc, and at the intersection of the arc and the arc, the tangent of the arc coincides with the tangent of the arc.

6. The initial mold for forming circular glass bottles and jars according to claim 5, characterized in that, The arc is centered at the cross-sectional center of the internal cavity, with a radius of R. The intersection of the arc and the seam line is the maximum correction point, and the distance between the maximum correction point and the center is L, where L > R. Let the difference between L and R be the thickness correction value K. <K<0.05R。 7. The initial mold for forming circular glass bottles and jars according to claim 1, characterized in that, The horizontal angle θ corresponding to the arc is 180°.

8. A preliminary mold for forming circular glass bottles and jars according to claim 7, characterized in that, The arc line is an elliptical arc line. The elliptical arc lines at the two seam positions of the two half molds are connected to form an ellipse, and the major axis of the ellipse coincides with the seam line.

9. A preliminary mold for forming circular glass bottles and jars according to claim 8, characterized in that, The ratio of the major axis to the minor axis of the ellipse is e, 1 <e<1.1。 10. A preliminary mold for forming circular glass bottles and jars according to claim 1, characterized in that, The upper edge of the thickness correction zone is located below the bottleneck of the internal cavity, and the lower edge of the thickness correction zone is located above the bottom of the internal cavity.

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