Blowing mold structure capable of improving product yield

Abstract

The utility model discloses a blowing expansion mould structure capable of improving product yield, which comprises a left mould body and a right mould body, half cavities are respectively arranged in the mould bodies on the two sides, blow molding ports are arranged on the mould bodies, and the mould bodies on the two sides are respectively composed of a bottom mould, a middle mould and a top mould. Bottom rib grooves for forming reinforcing ribs at the bottom of a blow molding product are formed in mold closing seams at the bottoms of the cavities of the bottom molds on the two sides; and top rib grooves for forming top reinforcing ribs of the blow molding product are formed in mold closing seams at the tops of the cavities of the top molds on the two sides. According to the utility model, the bottom rib groove and the top rib groove are respectively formed in the mold closing seams of the bottom mold and the top mold of the mold body, so that a material blank can be prevented from being cut off by the mold closing cutting edge of the mold, meanwhile, the problems of cracking and thickness reduction caused by stretching at the mold closing seams during blowing expansion can be avoided, and the yield can be effectively improved after blow molding is finished; and reinforcing ribs are respectively formed at the top and the bottom of the product, so that the strength of a mold closing seam of the product is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to blow molding mold technical field, concretely relates to a blow mold structure of promoting product yield. BACKGROUND

[0002] Plastic articles often used in life are processed by injection molding or blow molding. Blow molding is widely used in hollow thin-walled objects with thermoplastic materials. Generally, there are two main types of blow molding: extrusion blow molding and stretch blow molding. The former is widely used to produce containers of various sizes and shapes, and is also suitable for producing irregular and complex hollow parts. The latter is widely used to produce commercial plastic bottles, and is suitable for food, beverage, pharmaceutical industries and other fields. The general process of extrusion blow molding is as follows: (1) melt the plastic into a tubular parison by extrusion; (2) close the mold to hold the parison, insert the air nozzle into one end of the parison, and close the other end of the parison and cut it off; (3) blow up the parison with compressed air to form the product; (4) cool the blow molded product; (5) open the mold to take out the product, cut off the tail, trim the flash, and get the finished product.

[0003] The structure of the blow molding mold mainly consists of two half cavities, container neck and bottom insert, and other forming parts and guide parts, which are used to form various hollow blow molded products. The shape of the cavity of the blow molding mold is generally complex, in addition to the overall curved shape, there are some special local structures, patterns, designs, threads, etc. The joint surface of the two half cavities should be flat, and there should be no obvious joint line on the surface of the product after jointing.

[0004] The existing blow molding mold has the following problems: 1. When the mold is closed and clamped, the joint blade of the top of the mold can directly clamp the parison, causing the parison to fall into the cavity of the mold, which cannot be blown up subsequently; 2. When blowing up, the joint seam between the bottom and the top is easy to crack or thin due to excessive stretching, resulting in low yield of the product; 3. The strength of the product at the joint position of the top and the bottom is low, which is easy to break. SUMMARY

[0005] The utility model discloses a blow mold structure for improving product yield, which can prevent the parison from being clamped and falling by the joint blade of the top, and avoid the problem of cracking and thickness thinning caused by stretching at the joint seam. The reinforcing ribs are formed at the top and bottom positions of the finished product to enhance the strength of the joint seam.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The utility model designs a kind of blow-molding die structure for improving product yield, including left and right two-part die body, one half cavity is formed in two sides die body, two sides die body are buckled and installed together, inside is formed the shape corresponding to product, blow molding port is equipped on die body.

[0008] Two sides die body are all composed of bottom die, middle die, top die three parts, half groove is respectively formed in the bottom of the cavity of two sides bottom die at the joint of mould, after moulding, the half groove of two sides bottom die is combined into a bottom rib groove for forming the bottom reinforcing rib of blow-molding product;

[0009] Half groove is respectively formed in the top of the cavity of two sides top die at the joint of mould, after moulding, the half groove of two sides top die is combined into a top rib groove for forming the top reinforcing rib of blow-molding product.

[0010] By forming bottom rib groove at the joint of mould of the bottom of die body bottom die and top rib groove at the joint of mould of the top of top die, when the die is closed and clamped, the material can be prevented from being clamped off by the joint of mould of the top, and the material can be prevented from falling and affecting the subsequent blow-up process;The joint of mould of the bottom and the top can also be prevented from cracking or thinning due to excessive stretching when blow-up is performed;After blow-molding is completed, reinforcing rib is formed at the joint of mould of the top and the bottom of product respectively, so that the problem of low strength, easy breakage or deformation at the joint of mould of the top and the bottom of blow-molding product in the prior art is solved.

[0011] Preferably, extension edge expanding outward is arranged at the two side edges of top rib groove, to expand the connecting surface of material in top rib groove and the material of product top, to prevent the top from collapsing, to prevent the joint of mould of the top from being broken due to stretching, and to thicken the joint of mould of the top of product, to increase the strength of the joint of mould of the top of product.

[0012] Preferably, the two side edges of top rib groove and extension edge are arc-shaped transition, and the arc-shaped transition edge is beneficial to subsequent demoulding.

[0013] Preferably, when the top of blow-molding product has handle, top rib groove is formed at the joint of mould edge for forming the hollow position of lower part of handle, and the reinforcing rib formed extends along the curved shape of product top.

[0014] Preferably, half-grooves are respectively arranged at the bottom of the cavity of the two-sided bottom die and the transition position of the side edge, and the two half-grooves at the position are combined into a side rib groove for forming the reinforcing rib at the bottom and the transition position of the side edge of the blow molding product after the mold is closed.

[0015] Preferably, the side rib grooves of the two sides are respectively connected with the two ends of the bottom rib groove, and the top end of the side rib groove extends to the abutting position of the bottom die and the middle die.

[0016] Preferably, the end edges of the bottom rib groove, the top rib groove and the side rib groove are arc chamfers, and the arc chamfers at the ends of the rib grooves make the positions of the top and bottom reinforcing ribs convenient to demold after the blow molding is completed.

[0017] The utility model discloses the beneficial effect lies in:

[0018] The utility model discloses a blow molding die, which comprises a bottom die, a top die and a middle die, wherein the bottom die and the top die are connected with the middle die, and the middle die is provided with a bottom rib groove and a top rib groove. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the external structure schematic view of the blow molding die of the utility model;

[0020] Figure 2 It is the internal structure schematic view of the die body;

[0021] Figure 3 It is the A part enlarged view in Figure 2

[0022] Figure 4 It is the B part enlarged view in Figure 2

[0023] Figure 5 It is the local enlarged view of the bottom rib groove;

[0024] Figure 6 It is the front view of the internal structure of the die body in Figure 2

[0025] Figure 7 It is the structure schematic view of the top rib groove in Figure 6

[0026] Figure 8 It is​​​​Figure 6 A partial enlarged view of the top rib groove position after sectioning along CC;

[0027] Figure 9 This is a schematic cross-sectional view of the top reinforcement rib after blow molding;

[0028] Figure 10 This is a schematic structural diagram of a product after blow molding in one embodiment.

[0029] Numbers in the figure: 1 mold body, 2 bottom mold, 3 middle mold, 4 top mold, 5 bottom rib groove; 6 top rib groove, 7 extension edge, 8 handle cavity, 9 side rib groove, 10 mold closing contact surface, 11 top reinforcement rib, 12 handle, 13 blow molded product, 14 bottom reinforcement rib. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention will be described below with reference to the accompanying drawings and examples. However, the following examples are only used to illustrate the implementation of the present invention in detail and do not limit the scope of the present invention in any way.

[0031] Example 1: A blow mold structure for improving product yield, see Figures 1-2 , including two parts of the left and right mold bodies 1, each of which has a half cavity. The mold bodies 1 on both sides are buckled and installed together, and the shape of the corresponding product is formed inside. A blow molding port is provided on the mold body 1.

[0032] The mold bodies 1 on both sides are composed of three parts: bottom mold 2, middle mold 3 and top mold 4. Half grooves are respectively opened at the mold seam at the bottom of the cavity of the bottom mold 2 on both sides. After the mold is closed, the half grooves of the bottom mold 2 on both sides are merged into a bottom rib groove 5 for forming the bottom reinforcement rib of the blow molded product. Figure 5 ; Half grooves are respectively provided at the top of the cavity of the top mold 3 on both sides. After the mold is closed, the half grooves of the top mold 3 on both sides are merged into a top rib groove 6 for forming the top reinforcing rib of the blow molded product. Figure 4 、 Figure 6 .

[0033] In this embodiment, the blow molded product 13 is a barrel-shaped structure. Figure 10 , there are handles and a barrel mouth at the top of the product. At this time, a top rib groove 6 is opened at the edge of the mold seam for forming the hollow position of the lower part of the handle 12, and the formed top reinforcement rib 11 extends along the curved surface shape of the top of the product. In order to form the handle structure at the top of the blow-molded product 13, a handle cavity 8 for forming the handle 12 is provided at the corresponding position of the top mold 4. The lower part of the handle cavity 8 is a filling part for forming the hollow position of the lower part of the handle 12; the lower part of the filling part is the position for forming the top surface of the blow-molded product 13, and a top rib groove 6 is opened at the edge of the mold seam at the corresponding position. The top rib groove 6 extends along the curved surface shape of the top of the blow-molded product 13. FromFigure 7 As can be seen, the mold closing contact surface 10 is the contact surface when the two mold bodies 1 are closed, and the space within the contact surface is the cavity for forming the shape of the blow molded product, such as the handle cavity 8, and the top rib groove 6 is located below the handle cavity 8 and a hollow area is formed between the top rib groove 6 and the handle cavity 8, which is the space for forming the lower part of the handle 12.

[0034] In this embodiment, the bottom reinforcing rib 14 formed after blow molding is located at the bottom of the product, and the middle position of the product bottom is slightly concave upward, and the bottom reinforcing rib 14 also extends along the shape of the product ground. Part of the top reinforcing rib 11 is located below the handle, and extends along the curved surface of the top of the product, and the position between the other side of the handle 12 and the barrel mouth is also prone to breakage and thinning due to stretching during blow molding, so a corresponding top rib groove 6 is also provided at the position between the handle and the barrel mouth, and a top reinforcing rib 11 is also formed at this position, so that the strength of this position is also strengthened (the top reinforcing rib 11 can also be considered to be separated into two parts by the handle 12).

[0035] Further, on the basis of Embodiment 1, an extension edge 7 extending outward is provided on both side edges of the top rib groove 6, for expanding the connecting surface of the blow molding material in the top rib groove 6 and the material of the top of the product. The side edges of the top rib groove 6 and the extension edge 7 are arc-shaped transitions, as shown in Figure 8 The cross-sectional shape of the top reinforcing rib 11 formed after blow molding is shown in Figure 9 As can be seen, the connecting surface between the bottom of the top reinforcing rib 11 and the top surface of the product is wider than the upper part of the top reinforcing rib 11, so that the problem of breakage or thinning due to stretching at this position during blow molding can be avoided, and the strength of the blow molded product at this position is increased.

[0036] Further, on the basis of Embodiment 1, a half groove is provided at the mold closing seam at the transition position between the cavity bottom and the side edge of the two side molds 2, and the two half grooves at this position combine into a side rib groove 9 for forming a reinforcing rib at the transition position between the bottom and the side edge of the blow molded product after the molds are closed, as shown in Figure 3 The side reinforcing rib formed at this position after blow molding can increase the strength of this position.

[0037] Another embodiment: the side rib groove 9 of each side is connected to both ends of the bottom rib groove 5, and the top end of the side rib groove extends to the abutting position of the bottom mold and the middle mold.

[0038] In the above embodiments, the end edges of the bottom rib groove 5, the top rib groove 6 and the side rib groove 9 are all arc-shaped chamfers, which facilitate the demolding of the blow molded product 13 after molding.

[0039] In the above embodiments, the equipment elements involved are all conventional equipment elements unless otherwise specified.

[0040] The specific working mode of the blow-molding die structure for improving product yield is as follows: after the die bodies at both sides are installed, operation is performed according to the procedure of the blow-molding process, and the blow-molding process can effectively improve the product yield; the product after blow-molding has a reinforcing rib formed at the top and the bottom respectively, the strength of the joint between the top and the bottom of the blow-molded product is increased, and the overall quality of the product is improved.

[0041] The embodiments of the utility model are described in detail above in combination with the drawings and examples, but the utility model is not limited to the above-mentioned embodiments, and within the knowledge range possessed by those skilled in the art, changes or alterations can also be made without departing from the purpose of the utility model.

Claims

1. A blow molding die structure for improving product yield, comprising a left and right mold body, each of which has a half cavity, and a blow molding port on the mold body, characterized in that: The mold bodies on both sides are composed of three parts: bottom mold, middle mold and top mold. Half grooves are opened at the mold seam at the bottom of the cavity of the bottom mold on both sides. After the mold is closed, the half grooves of the bottom mold on both sides are merged into a bottom rib groove for forming the bottom reinforcement rib of the blow molded product. Half grooves are respectively opened at the mold seam at the top of the cavity of the top molds on both sides. After the mold is closed, the half grooves of the top molds on both sides are merged into a top rib groove for forming the top reinforcing ribs of the blow molded product.

2. The inflation mold structure for improving product yield according to claim 1, characterized in that: Outwardly extending extension edges are provided on both side edges of the top rib groove to expand the connection surface between the material in the top rib groove and the top material of the product.

3. The inflation mold structure for improving product yield according to claim 2, characterized in that: There is an arc-shaped transition between the two side edges of the top rib groove and the extended edge.

4. The inflation mold structure for improving product yield according to claim 1, characterized in that: When the blow-molded product has a handle on the top, the top rib groove is opened at the edge of the mold seam for forming the hollow position at the bottom of the handle, and the formed top reinforcement rib extends along the curved surface shape of the product top.

5. The inflation mold structure for improving product yield according to claim 1, characterized in that: Half grooves are respectively opened at the mold bottom and side transition position of the bottom mold on both sides. After mold closing, the two half grooves here are merged into a side rib groove for forming reinforcing ribs at the bottom and side transition position of the blow molded product.

6. The inflation mold structure for improving product yield according to claim 5, characterized in that: The side rib grooves on both sides are respectively connected to the two ends of the bottom rib groove, and the top ends of the side rib grooves extend to the butt joint position between the bottom mold and the middle mold.

7. The inflation mold structure for improving product yield according to claim 5, characterized in that: The end edges of the bottom rib groove, the top rib groove and the side rib groove are arc-shaped chamfers.

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