KR830000946B1 - Injection Blow Molding Machine of Double Blow Molding Products - Google Patents

Abstract

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Description

Injection Blow Molding Machine of Double Blow Molding Products

1 (A ₁ ), (A ₂ ) and (C) are vertical cross-sectional views showing internal parisons, double parisons as base members and double bottles, respectively.

2 is a plan view of an injection blow molding machine according to the present invention.

3 is a cross-sectional view taken along line III-III of FIG.

4 is a vertical sectional view of the heating step.

5 is a vertical cross-sectional view of the stretching and blow molding step.

6 is a vertical cross-sectional view of the mold release step.

FIG. 7 is a vertical section showing another embodiment of an injection molding step as shown in FIG.

8 is a plan view showing the injection mold portion.

The present invention relates to an improved injection blow molding machine in which double molding of resin parason as a base member and stretching and indenting molding in a hollow molded article can be continuously performed.

Since the injection molding resin parason as a base member is placed on a core and in a blow mold which blows air from the core to make a hollow molded part, since the core can be used as a conveying member for such a parason, It is not technically difficult to blow molding and form a double layer of parison as a base member.

However, in the method in which the injection molding Parison made of the base member is heated and stretched in order to manufacture the hollow molded article, the core used for injection molding can be used for the primary tongue of the double flyson made of the base member, Since the parison is fixed by a neck mold to be transported, it cannot be used for secondary molding without modification. Furthermore, each process, such as injection, heating, stretching and blow molding loosening, which must be performed whenever the injection molding machine is intermittently rotated, is hindered. It is not possible to carry out only the process of the injection molding step in another molding cycle. Therefore, it was thought that the injection molding machine in the form of conveying together with the parison of the base mold by the conveying plate rotating the intermittent mold was not suitable for making a double-layer hollow molded product.

However, if the double injection molding machine of Parison as a base member is inserted in the molding cycle from injection molding to mold release step, the injection molding machine, which is considered structurally inadequate, can still be used to produce a double hollow molded article by a blowing method. have.

Therefore, the first injection molding machine of the so-called four-stage, four-mould type has been proposed in which four operating steps, namely, injection molding step, heating step, stretching and blow molding step, and mold release step are arranged. In this type of injection molding machine, the conveying plate is intermittently rotated around the support shaft, stopping in order to carry out the proper procedure when the mold is placed in each step in the order mentioned. In order to make a double flyson of the base member using such an injection molding machine, a pre-injected cold flyson is attached to the core with the inner flyson and then the outer flyson is injected outside the inner flyson. It must be molded. However, there is a need for a special device for attaching cold parason to the core. In addition, molten materials should not be applied to cold parisons if good hollow double molded parts are required.

Thus, on the basis of the conventional injection molding machine, which is a four-stage, four-mould-type molding machine in which each mold is arranged at each step, the inventors use the same as the one used for forming a single layered bottle. As a molding cycle, a new injection molding machine has been developed that can continuously produce double parison and double bottles as basic members.

Your steps, namely injection molding step, heating step, stretching and blow molding step, and mold releasing step are necessary to perform injection blow molding. However, the number of wood molds does not have to be equal to the number of steps because each wood mold stops at each step.

Therefore, the inventor has invented a four-stage, five-mould type injection blow molding machine, in which the injection molding step has been extended to surround the stop positions of the two wooden molds and the angular mold dies stop at each step.

As a result, in this type of injection molding machine, two wood molds always stop in the injection molding step, and each wood mold stops twice in the injection molding step, so that the double-parison as a base member is formed by the injection molding method. Completely molded. Moreover, this structure allows the two pairs of molds to be opened and closed by a conventional fastening device or a fastening separator. The intermittent rotation of the conveying plate is made at a lower angle compared to the case of the four wood molds, which does not deteriorate the characteristics of the molding cycle.

According to the injection blow molding machine of the present invention, a single-layer flyson as a base member is continuously produced in a double bottle and other hollow molded articles by the same method as injection molding and blow molding with a four-stage, four-mould type injection blow molding machine. It is possible to do The two pairs of injection molds can be opened or closed simultaneously or separately depending on the resin material used. Thus, it is possible to carry out double molding with one resin material as it can be done with two different resin materials. With proper selection of the resin material to be used, it is possible to achieve Mass production is possible.

The accompanying drawings show an injection blow molding machine for producing a double molded article according to the present invention.

1 (A ₁ ), (A ₂ ) and (C) show hollow molded articles produced by the stretching and blow molding methods, such as double parison and double bottles 2 of the base member 1. Number 1a denotes an inner flyson, 1b denotes an outer flyson, 2a denotes an inner layer, and 2b denotes an outer layer.

In FIG. 2 and later, the injection molding machine 10 comprises a lower base plate 12 that is horizontal on the bench 11 and an upper base plate 13 arranged in parallel at predetermined intervals on the base plate 12. The spacing between these base plates becomes the forming space.

The upper base plate 13 is stretched and blow-molded in the step (C) by two connecting rods 9 arranged vertically on the bench 11 at the side of the injection molding step, which are separated in parallel and separated from each other. It is fixed to the machine 11 by the support members (not shown) installed in the horizontal.

The transfer plate 16 disposed below the bottom surface of the upper base plate 13 is intermittently driven by the motor 15 at an angle of 72 ° around the central support shaft 14. Five neck molds 17 closed by the springs 17a can be arranged on the bottom surface of the transfer plate 16 to be opened and closed radially at equal distances from each other. The wood mold 17 stops at four operating stages of the parison, namely, the injection molding stage (A), the heating stage (B), the stretching and blow molding stage (C), and the mold loosening stage (D).

Among these steps, the injection molding step (A) comprises the stop positions of the two wood molds, while each of the other steps takes place under each of the molds 17.

3 shows the injection molding step A, in which the mold clamping device 18 is arranged vertically to surround the upper base plate 13.

Two pairs of injection molds 21 and 22 for each wood mold 17 are arranged on the lower mold clamping plate 19 to constitute a primary molding portion A ₁ and a secondary molding portion A ₂ , respectively. Cores 23 and 24 of the same shape are disposed below the upper mold clamping plate 20 to be used jointly through the upper base plate 13, the transfer plate 16, and the wood mold 17.

In the injection molding step (A), when each wood mold 17 stops on the injection molds 21 and 22, when the wood molds 17 stop on the injection molds 21 and 22, the injection molds 21 and 22 are made of wood molds. At the same time as (17), it is sealed by the ram 27 of the mold tightening cylinder 25, and the cores 23 and 24 are then jointly inserted by the ram 28 of the mold tightening cylinder 26. As the mold is hermetically sealed and tightly tightened, the injection molding machines 29 and 30 inject molten material by nozzle contact, so that an inner flyson 1a is formed around the core 23 at the primary molding portion A ₁ . The outer parison 1b is formed in the secondary molding portion A ₂ , thereby forming a double parison of the base member 1. In this case, in the primary forming part A ₁ , the molten material is pressed in the wood mold 17, so that the threaded part as shown in FIG. 1 (A ₁ ) is also molded. In the secondary forming part A ₂ , since the molten material is already filled in the metal mold, the shaping of the threaded part is not performed and the outer flyson 1b is internal as shown in FIG. 1 (A ₂ ). It is formed on the outer side of the parison 1a.

After the injection molding is completed, the mold is opened and the cores 23 and 24 are removed from the double flyson consisting of the inner flyson 1a and the base member 1 so that each of the flysons is tightened by the wood mold 17. Lose. As the transfer plate 16 rotates, the inner flyson 1a is transferred to the secondary molding with the wood mold 17 and the double flyson made of the base member 1 is transferred to the heating step B.

As shown in FIG. 4, the double parison as the base member is heated by the heating furnace 31 on the lower base plate 12 in the heating step (B). After the temperature is adjusted, the double parison is transferred to another drawing and blow molding step (C) shown in FIG. 5 via another partial rotation.

The drawing and blowing molding step (C) includes a blowing mold 32 which is opened and closed radially on the lower base plate 12, a nozzle 33 and a drawing rod inserted into a flyson made of a base member through the upper base plate 13. Has 34. After the mold is sealed, the parison as the base member 1 is extended in the axial direction by the draw rod 34 inserted therein from the upper base plate 13 by the air cylinders 35 and 36, and the nozzle 33 Along with the air introduced from In this way, as shown in FIG. 1C, a double bottle 2 composed of an inner layer 2a and an outer layer 2b is formed.

After stretching and blow molding, the mold is opened, and the double bottle 2 supported by the wood mold is transferred to the rim mold pull step D by the transfer plate 16.

The guide rod 37 included in the mold release step D is inserted into the mouth of the bottle supported by the wood mold 17 through the upper base plate 13 and the transfer plate 16 by the air cylinder 38. do. After the guide rod 37 is inserted, the wood mold 17 is opened, and the double bottle 2 guided by the guide rod 37 is not attached to either of the open wood molds 17 but is vertically downward. Falls.

As the transfer plate 16 performs another partial rotation, the wood mold 17 is sealed and again the primary molding portion A of the injection molding step A to start a series of injection molding, stretching and blow molding. Transfer to ₁ ).

The embodiment shown in FIG. 7 is a case where the mold clamping device is separately configured for the primary molding part A ₁ and the secondary molding part A ₂ of the injection molding step A. As shown in FIG. Parts structurally identical to those shown in FIG. 2 are designated by the same reference numerals and will not be described any further.

The connecting rod 91 is disposed perpendicularly to the center of the injection molding step A, ie to the center between the connecting rods 9.

In the primary molding part A ₁ , the lower mold clamping plate 191 and the upper mold clamping plate 201 may be disposed between the connecting rods 9 and 91 to move vertically. In the secondary molding part A ₂ , the lower mold clamping plate 192 and the upper mold clamping plate 202 are disposed between the center connecting rod 91 and the outer connecting rod 9 in the same fashion. The rams 271 and 272 of the hydraulic cylinders 251 and 252 fixed to the lower ends of the connecting rods 9 and 91 are connected to the upper mold clamping plates 191 and 192, respectively, to facilitate tightening of the separation mold.

Equally, as in the case of the lower mold clamping plates 191 and 192 of the hydraulic cylinders 261 and 262 fixed to the upper ends of the respective connecting rods, the upper mold clamping plates 201 and 202 are respectively connected to facilitate tightening of the separating mold.

The advantage of the separate mold clamper operation for the primary molding part (A ₁ ) and the secondary molding part (A ₂ ) is that the curing time can be arbitrarily selected according to the resin material used, thereby facilitating double molding with two different resin materials. Is there.

8 shows another embodiment of an injection mold, wherein the nozzle contact portions 21a, 22a protrude from the outer side surfaces of the two pairs of injection molds. These sides are raised in different directions so that the projecting ends are directed in the same direction and the two injection molding machines 38 and 39 will be parallel to facilitate nozzle contact.

In summary, the injection molding step (A) comprises two wood molds 17 in a stop position, and two pairs of injection molds 21 and 22 are arranged for each wood mold 17 and opened and closed. The primary forming portion A ₁ is formed adjacent to the secondary forming portion A ₂ , and each time the transfer plate 16 stops, the inner flyson 1a and the outer flyson 1b are the base member. It is injection molded simultaneously to form (1) double parison.

However, it should be understood that the present invention need not be limited in forming a double hollow molded article.

This is because the injection molding of the three-layer parison as the base member can only be achieved by increasing the number of neck molds and extending the injection molding step to include three wood molds in the stationary position.

Claims (1)

In an injection blow molding machine for forming a two-layer or double blow molded article, the conveying plate 16 has, on its lower surface, a wood mold 17 one spaced at a greater number of equal distances than the operating steps. (11) arranged horizontally, the drive unit drives the conveying plate 16 horizontally and intermittently, four operating steps, namely injection molding step (A), heating step (B), stretching and blow molding step (C), each of the mold release step (D) is arranged in the limit position of the old wood mold 17 on the machine table 11, the injection molding step (A) is a double member of the base member (1) The inner flyson 1a and the outer flyson 1b are separated so that the flyson is formed in cooperation with the cores 23 and 24 inserted through the wood die 17 at the stop positions of the two wood dies 17. Having two pairs of injection molds (21, 22) for forming and extending to include the stop positions of two adjacent wood molds (17) Injection blow molding machine of the double blow molded article according to.

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