TWI862895B - Anti-chip structure of the center axis of injection blow molding mold - Google Patents

Abstract

A central axis anti-chip structure of an injection-blow molding mold is used on an injection-blow molding mold to blow air through a central axis to a blank wrapped in the central axis in the injection-blow molding mold to expand it and form a container by sticking to the inner wall of the injection-blow molding mold. The central axis is in a tubular shape and includes an upper tube part and a lower tube part. The upper tube part is connected to a blow molding machine, and the lower tube part extends into the connection port to blow air to the blank. The joint of the upper tube part and the lower tube part forms a contraction section that contracts toward the center. The contraction section prevents the lower tube part from contacting the blank during the molding process, and the contraction section can be smoothly separated from the container when demolding to prevent plastic chips from falling into the container.

Description

Anti-chip structure of the center axis of the injection blow molding mold

The present invention relates to parts and accessories for injection blow molding molds, and particularly to a central axis anti-chip structure for injection blow molding molds, wherein a retracted section that retracts toward the center is provided on the central axis to prevent plastic chips from falling into the mold during demolding.

According to the press release, the injection blow molding mold is also called the blow mold. The injection blow molding steps include: 1. Blow molding the preform (as shown in the A part of Figure 6); 2. Open the injection mold and turn it to the blow molding station (as shown in the B part of Figure 6); 3. Close the mold for blow molding and cooling; 4. Rotate to the demoulding station to take out the part (as shown in the C part of Figure 6); 5. Preform.

As shown in FIG. 7 , the central axis 2 is a straight tube structure. In step 2, the injection-blow mold 1 is closed and clamps the central axis 2. In step 3, since the central axis 2 is a straight tube, it is easy to pull the bottle mouth of the container 4 during demolding, and the plastic scraps B may fall into the container 4 and cause contamination.

How to solve the above problems is an issue that relevant industries are actively working on.

The main purpose of the invention is to provide a central axis anti-chip structure for an injection blow molding mold. A contraction section that contracts toward the center is provided at the location where the central axis is connected to the bottle mouth. During the demolding process of blow molding, the plastic can be prevented from falling into plastic chips during demolding.

Therefore, the structure of the present invention is used on an injection-blowing mold to blow air through a central axis to a blank wrapped in the injection-blowing mold to expand it and adhere to the inner wall of the injection-blowing mold to form a container. The injection-blowing mold is provided with a connecting interface. The central axis is connected to the connecting interface when the mold is closed to blow air into the blank. The central axis is in a tubular shape and includes an upper tube part and a lower tube part. The upper tube part is connected to a blow molding machine, and the lower tube part extends into the connecting interface to blow air into the blank. Its characteristics are:

The diameter of the central axis at the upper tube is larger than that of the lower tube, and a contraction section that contracts toward the center is formed at the junction of the upper tube and the lower tube. The contraction section prevents the lower tube from contacting the blank during the forming process, and the contraction section allows the lower tube to smoothly detach from the container during demolding, preventing plastic scraps from falling into the container.

Through the above description, the features and effects of the present invention are briefly described as follows:

1. The contraction section prevents the lower tube from contacting the container, thus preventing plastic debris from remaining in the container during demolding.

2. The shrinkage section can be used to smoothly remove from the container during demoulding.

1: Injection blow mold

11:Connection interface

2: Center axis

21: Upper tube section

22: Lower tube

23: Contraction

3: Blank material

4:Container

41: Inner wall

B: Plastic scraps

Figure 1: is a schematic diagram of the present invention in which the blank is arranged on the central axis.

Figure 2: This is the structural diagram of the central axis.

Figure 3: is a diagram of the present invention in use (I), which shows that the blank is set outside the central axis.

Figure 4: is the use state diagram (II) of the present invention, which shows a schematic diagram of blowing air into the blank so that it fits on the inner wall of the injection-blowing mold to form a container.

Figure 5: This is the usage status diagram of the present invention (III), which shows the demoulding state.

Figure 6: This is a schematic diagram of the operation of the conventional injection blow mold.

Figure 7: Schematic diagram of demoulding a conventional injection blow mold.

As shown in Figures 1 to 5, the central axis anti-chip structure of the injection-blow molding mold of the present invention is used on an injection-blow molding mold 1 to blow air to a blank 3 wrapped in the central axis 2 in the injection-blow molding mold 1 through a central axis 2 to expand it and form a container 4 close to the inner wall of the injection-blow molding mold 1; the injection-blow molding mold 1 is provided with a connecting port 11, and the central axis 2 is connected to the connecting port 11 when the mold is closed to blow the blank 3 into shape. The central axis 2 is in a tubular shape and includes an upper tube part 21 and a lower tube part 22. The upper tube part 21 is connected to a blow molding machine, and the lower tube part 22 extends into the connecting port 11 to blow air to the blank 3.

As shown in FIG. 2 , the diameter of the central axis 2 at the upper tube portion 21 is larger than that of the lower tube portion 22 , and a contraction section 23 that contracts toward the center is formed at the junction of the upper tube portion 21 and the lower tube portion 22 . The contraction section 23 prevents the lower tube portion 22 from contacting the blank 3 during the forming process, and the contraction section 23 allows the lower tube portion 22 to smoothly exit from the container 4 during demolding, thereby preventing plastic scraps from falling into the container 4 .

The above is an introduction to the various components of the present invention. The following is an introduction to the usage of the present invention.

1. As shown in Figures 1 and 3, squeeze the blank 3 into the injection blow mold 1.

2. As shown in Figure 4, after the central axis 2 is inserted into the connection port 11, air is blown into the blank 3 (that is, the area marked with a dotted line in Figure 4) so that it expands and fits on the inner wall of the injection-blow mold 1 to form a container 4.

3. The central axis 2 is withdrawn, and the container 4 is separated from the injection blow mold 1. Since the contraction section 23 prevents the lower tube 22 from contacting the inner wall 41 of the container 4, it can prevent plastic scraps from remaining in the container 4 during demolding.

4. The contraction section 23 can be smoothly separated from the container 4 during demoulding.

In summary, the structure of this invention has never been seen in any books or publications or used publicly, and it truly meets the requirements for invention patent application. We sincerely request the Bureau to review and approve the patent as soon as possible. I would be very grateful.

It should be noted that the above is a specific implementation example of the present invention and the technical principles used. If the changes made according to the concept of the present invention still do not exceed the spirit covered by the instructions and drawings, they should be stated within the scope of the present invention.

2: Center axis

21: Upper tube section

22: Lower tube

23: Contraction

Claims (1)

A central axis anti-chip structure of an injection-blow molding mold is used on an injection-blow molding mold to blow air to a blank wrapped on the central axis in the injection-blow molding mold to expand it and adhere to the inner wall of the injection-blow molding mold to form a container. The injection-blow molding mold is provided with a connection interface. The central axis is connected to the connection interface to blow air to the blank during mold closing. The central axis is in a tubular shape and includes an upper tube part and a lower tube part. The upper tube part is connected to a blow molding machine, and the lower tube part extends into the connection interface to blow air to the blank. The central axis is characterized in that the diameter of the upper tube part of the central axis is larger than the diameter of the lower tube part, and a contraction section that contracts toward the center is formed at the joint of the upper tube part and the lower tube part. The contraction section is used to prevent plastic chips from falling into the container by not contacting the blank during demolding.

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