JP2005059239A - Compression molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly prevent the continuous occurrence of compression molding failure by detecting a case that a synthetic resin material (34) is not properly supplied to the required region of a female mold member (10) to stop the operation of a compression molding machine by an appropriate mode and to certainly avoid the damage of the compression molding machine, especially the mold means (4) thereof. <P>SOLUTION: A detection means (44), which detects whether the synthetic resin material is properly supplied into the female mold member, is arranged at the detection position (B) set between the synthetic resin material supply position (A) and closing movement completing position (D) in the endless route (8) of a mold means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compression molding apparatus for compression molding a molten or softened synthetic resin material into a required shape.
[0002]
[Prior art]
As a beverage container, a synthetic resin container formed from an appropriate synthetic resin such as polyethylene terephthalate has been widely used. Such a synthetic resin container can be conveniently formed by compression molding a preform (also referred to as a preform) and then blow molding the preform.
[0003]
Patent Documents 1 and 2 below disclose a compression molding apparatus for compression molding a preform. Such a compression molding apparatus includes a plurality of mold means, a synthetic resin material supply means, and a molded product take-out means. The mold means is composed of a female member and a male member that are relatively opened and closed to be set in an open state and a closed state. The female mold member is provided with a molding recess extending substantially vertically from the opened upper end. The plurality of mold means are mounted on the rotary support at equal intervals in the circumferential direction, and are moved through a circular endless path according to the rotation of the rotary support. In the endless path, a synthetic resin material supply position, a closing completion position, an opening start position, and a molded product removal position are sequentially arranged. Each of the mold means is closed until it reaches the closing completion position after passing through the synthetic resin material supply position, and is set in the closed state, and after passing through the opening start position, it reaches the synthetic resin material supply position. It is made to open until it is set to the open state. When each of the molding die means passes through the synthetic resin material supply position, the synthetic resin material supply means causes the synthetic resin material in a molten or soft state to fall into the molding concave portion from above the molding concave portion of the female mold member. When each of the mold means passes through the molded product take-out position, the molded product compression-molded from the mold means is taken out by the molded product take-out means.
[0004]
[Patent Document 1]
JP-A-10-337769 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-108127
[Problems to be solved by the invention]
Thus, the conventional compression molding apparatus as described above has the following problems to be solved. According to the experience of the present inventors, although rare, the synthetic resin material supplied by the synthetic resin material supply means is somewhat displaced from the required member without being properly supplied to the required part of the female member. May be supplied. When such a situation occurs, the synthetic resin material supplied in a displaced manner is not compression-molded into a required molded product, and is compression-molded into an undesired form in which the entire product cannot be taken out by the molded product take-out means. As a result, bad compression molding occurs continuously and, in some cases, may cause unacceptable damage to the compression molding apparatus, particularly its mold means.
[0006]
The present invention has been made in view of the above facts, and the main technical problem thereof is that a synthetic resin material is not properly supplied to a required part of a female mold member, and thus a compression molding apparatus is detected. Is stopped in an appropriate manner to reliably prevent the continued occurrence of defective compression molding and also to avoid damage to the compression molding apparatus, particularly its mold means.
[0007]
[Means for Solving the Problems]
According to the present invention, whether or not the synthetic resin material has been properly supplied into the female mold member at the detection position located between the synthetic resin material supply position and the closing completion position in the endless path of the mold means. By disposing detection means for detecting, the main technical problem is achieved.
[0008]
That is, according to the present invention, the compression molding apparatus that achieves the main technical problem includes a plurality of mold means, a synthetic resin material supply means, and a molded product take-out means. Each is composed of a female member and a male member that are relatively opened and closed and are selectively set in an open state and a closed state, and are provided with a synthetic resin material supply position, a closing completion position, and an opening start position. And the molded product take-off position is moved through an endless path that is sequentially arranged, and after passing through the synthetic resin material supply position, the molded product is moved to the closing completion position and set in the closed state. And after being passed through the opening start position until the molded product take-out position is reached and set in the open state, the synthetic resin material supply means passes the synthetic resin material supply position. When the female mold part A compression molding apparatus for supplying a synthetic resin material in a melted or softened state to the molded product, and for taking out the molded product compressed from the molding die means when the molding die means passes through the molding product taking-out position. In
Detecting means for detecting whether or not the synthetic resin material is properly supplied into the female member at a detection position located between the synthetic resin material supply position and the closing completion position in the endless path; A compression molding apparatus is provided.
[0009]
Preferably, the female member has a molding recess extending substantially vertically from the opened upper end, and the synthetic resin material supply means drops the synthetic resin material into the molding recess from above the molding recess, The detection means detects whether or not a synthetic resin material is present in the molding recess, and detects whether or not the synthetic resin material is present in a specific region around the molding recess. When the first detector detects a synthetic resin material but the second detector does not detect a synthetic resin material, the detection means appropriately detects the synthetic resin material in the female member. When the first detector and the second detector both detect the synthetic resin material, the detection means does not appropriately supply the synthetic resin material into the female member. It is determined that Each of the first detector and the second detector preferably comprises a non-contact thermometer, particularly an infrared radiation thermometer. When the detection means determines that the synthetic resin material has not been properly supplied into the female mold member, the supply of the synthetic resin material by the synthetic resin supply means is immediately stopped, and the synthetic resin material is placed on the female mold member. It is preferable that the movement of the mold means is stopped after the mold means determined not to be supplied properly passes through the opening start position and before reaching the molded product take-out position.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiments of the compression molding apparatus constructed in accordance with the present invention will now be described in further detail with reference to the accompanying drawings.
[0011]
Referring to FIG. 1, which is a top view schematically illustrating a preferred embodiment of a compression molding apparatus constructed in accordance with the present invention, the illustrated compression molding apparatus is a horizontally disposed disk-shaped rotation. A support body 2 is provided, and a plurality of, in the illustrated case, 18 mold means 4 are arranged in the peripheral region of the rotary support body 2 at equal intervals in the circumferential direction. The rotary support 2 is rotated in a direction indicated by an arrow 6 about a rotation center axis extending substantially vertically (perpendicular to the paper surface in FIG. 1), and each of the mold means 4 is circularly endlessly routed accordingly. 8 is moved through. The endless path 8 of the mold means 4 is sequentially provided with a synthetic resin material supply position A, a detection position B, a closing start position C, a closing end position D, an opening start position E, as viewed in the rotation direction indicated by the arrow 6. An opening completion position F and a molded product removal position G are arranged.
[0012]
Referring to FIGS. 2 and 3, each mold means 4, which may be in a known form, is composed of a female member 10 and a male member 12. The female member 10 is formed with a molding recess 14 that extends substantially vertically from the upper surface thereof, and is thus open at the upper end. The male member 12 is disposed above the female member 10 in the vertical direction, and includes a pair of split members 18 that can be opened and closed together with the core member 16 in the horizontal direction. In the illustrated embodiment, the male member 12 is vertically moved or raised or lowered in the vertical direction so that the male member 12 is in the open position, ie, the raised position shown in FIG. 2, and in the closed position, ie, the lowered position, shown in FIG. And are set selectively. The pair of split members 18 of the male member 12 are selectively positioned at a closed position indicated by a solid line in FIG. 2 and an open position indicated by a two-dot chain line in FIG.
[0013]
As shown in FIG. 1, the compression molding apparatus is also provided with a synthetic resin material supply means 20 and a molded product take-out means 22. The synthetic resin material supply means 20 in the illustrated embodiment includes a rotation support body 26 that is rotated in the direction indicated by an arrow 24, and the rotation support body 26 includes a plurality of the illustrated illustrated at equal intervals in the circumferential direction. In this case, six cutting / conveying means 28 are attached. The cutting / conveying means 28 is moved through the circular endless path 30 in accordance with the rotation of the rotary support 26, and from the extruder at the cutting position X (only the extrusion port 32 is shown in FIG. 1). The extruded synthetic resin material 34 (FIG. 2) that has been extruded or cut is cut and held, and the held synthetic resin material 34 is opened at the synthetic resin material supply position A, so that the female of the mold means 4 is opened. It is dropped into the molding recess 14 formed in the mold member 10. Such a synthetic resin material supply means 20 itself may be in a well-known form, for example, the form disclosed in the above-mentioned Patent Document 2 can be used conveniently. Therefore, in this specification, the synthetic resin material supply means Detailed description of 20 itself will be omitted. The molded product take-out means 22 is provided with a plurality of, in the illustrated case, three take-out tools 40 that can be moved in the direction indicated by the arrow 38 through the circular endless path 36 and is opened from the mold means 4 at the molded product take-out position G. The molded product thus received is received and discharged to an appropriate collecting means (not shown) at the discharge position Y. Such a molded product taking-out means 22 itself may have a well-known form, and therefore a detailed description of the molded product taking-out means 22 itself is omitted in this specification.
[0014]
With reference to FIG. 1, in the illustrated compression molding apparatus, while the molding die means 4 is moved through the endless path 8, in the molding recess 14 of the female mold member 10 at the synthetic resin material supply position A. The synthetic resin material 34 is supplied (see also FIG. 2), and when the molding die means 4 reaches the closing movement start position C, the lowering of the male mold member 12 is started, and the molding die means 4 moves to the closing movement completion position D. 3, the molding die means 4 is brought into the closed state shown in FIG. 3, and thus the synthetic resin material 34 is a molded product 42 in the required form, and in the illustrated case, a preformed product that is blown later to be put into a container. , Compression molded. While the mold means 4 is moved from the closing completion position D to the opening start position E, the molding member 4 is maintained in the closed state, and the compression-molded molded article 42 is cooled. While the mold means 4 moves from the opening start position E to the opening completion position F, the male mold member 12 is raised and the pair of split mold members 18 of the male mold member 12 are opened, thus forming mold means. 4 is opened, and the compression molded article 42 is released from the mold means 4. At the molded product extraction position G, the molded product 42 released from the mold means 4 is received by the molded product extraction tool 40, and the molded product extraction tool 40 transfers the received molded product 42 to the collecting means.
[0015]
Thus, in the compression molding apparatus constructed in accordance with the present invention, between the synthetic resin material supply position A and the closing completion position D in the endless path 8 of the mold means 4, preferably the synthetic resin material supply position A and The synthetic resin material 34 is appropriately placed in the molding recess 14 of the female mold member 10 at the detection position B arranged between the closing movement start position C (the molding die means 4 is set in the open state during this period). It is important that a detecting means 44 for detecting whether or not the battery has been supplied is provided.
[0016]
4 and 5 together with FIG. 1, in the illustrated embodiment, a stationary support bracket 46 is provided in association with the detection position B, and the support bracket 46 is in an open state. There is a support arm extending between the female member 10 and the male member 12 of the set mold means 4. The first detector 48 and the second detector 50 constituting the detection means 44 are attached to the support arm. The first detector 48 and the second detector 50 are preferably composed of a non-contact type thermometer, particularly an infrared radiation thermometer. 4 and 5, the first detector 48 is directed to the center of the molding recess 14 formed in the female member 10 (thus detecting the temperature of the center), The second detector 50 is directed to a specific area around the molding recess 14 formed in the female member 10, that is, to the upper surface of the female member 10 located on the left side of the molding recess 14 in FIGS. (Thus detecting the temperature on such top surface).
[0017]
As shown in FIG. 4, when the synthetic resin material 34 is properly supplied into the molding recess 14 of the female member 10, the first detector 48 has a relatively high temperature of the synthetic resin material 34, Accordingly, a temperature higher than a predetermined threshold is detected, and thereby, it is detected that the synthetic resin material 34 is present at the center of the molding recess 14. On the other hand, the second detector 50 detects the temperature of the upper surface of the female member 10, which is relatively low, and thus a temperature lower than a predetermined threshold value, so that the synthetic resin material 34 does not exist on the upper surface of the female member 10. Detect that.
[0018]
On the other hand, in the illustrated embodiment, when the synthetic resin material 34 is not properly supplied into the molding recess 14 of the female mold member 10 due to the supply characteristics of the synthetic resin material supply means 20, as shown in FIG. The entire synthetic resin material 34 does not enter the molding recess 14, and the upper end of the synthetic resin material 34 is located in a specific region on the upper surface of the female mold member 10, that is, the left side of the molding recess 14 in FIGS. 4 and 5. 10 protrudes from the top surface. In this case, as clearly understood by referring to FIG. 5, the first detector 48 detects the temperature of the synthetic resin material 34, which is relatively high, and thus a temperature higher than a predetermined threshold. In addition to detecting the presence of the synthetic resin material 34 in the center of the molding recess 14, the second detector 50 also has a relatively high temperature of the synthetic resin material 34, and thus a predetermined threshold value. By detecting a high temperature, it is detected that the synthetic resin material 34 is also present on the upper surface of the female mold member 10.
[0019]
In the illustrated embodiment, when the synthetic resin material 34 is not properly supplied into the molding recess 14 of the female member 10, the upper end portion of the synthetic resin material 34 is shown in FIGS. 2, the second detector 50 is directed toward the upper surface of the female member 10 located on the left side of the molding recess 14. In the case where the upper end portion of the synthetic resin material 34 tends to protrude into other regions on the upper surface of the female mold member 10, one or more detectors directed to such regions can be added. . Further, the first detector 48 and the second detector 50 can also be constituted by appropriate detectors other than the infrared radiation thermometer. However, if a detector that contacts the synthetic resin material 34 is used to detect the presence of the synthetic resin material 34, the synthetic resin material 34 is locally cooled or deformed by contact with the detector, which is desirable for compression molding. There is a great possibility that it will not be affected. The presence of the synthetic resin material 34 can also be detected by an image pickup device such as a CCD (charge coupled device). However, if the synthetic resin material 34 in a molten or softened state is at least partially transparent or translucent, it is synthesized. The resin material 34 may be recognized as non-existing despite the presence.
[0020]
The signals generated by the first detector 48 and the second detector 50 are supplied to control means (not shown) of the compression molding apparatus. When the first detector 48 detects the presence of the synthetic resin material 34 but the second detector 50 does not detect the presence of the synthetic resin material 34, that is, within the molding recess 14 of the female member 10, the synthetic resin material 34. Is appropriately supplied, 1 is added to the count value of a counting means (not shown) for counting the number of molded articles 42 molded by the compression molding apparatus, and the operation of the compression molding apparatus is continued. On the other hand, when both the first detector 48 and the second detector 50 detect the presence of the synthetic resin material 34, that is, the synthetic resin material 34 is appropriately supplied into the molding recess 14 of the female member 10. If not, the supply of the synthetic resin material 34 to the mold means 4 by the synthetic resin material supply means 20 is immediately stopped. The supply of the synthetic resin material 34 is stopped, for example, without the synthetic resin material 34 cut and held by the cutting / conveying means 28 in the synthetic resin material supply means 20 being conveyed to the synthetic resin material supply position A. It can be realized by dropping it into an appropriate accommodating means (not shown) upstream of A. On the other hand, the movement of the mold means 4 does not stop immediately, and after the mold means 4 that has been detected that the synthetic resin material 34 has not been properly supplied has passed the opening start position E, the molded product is taken out. Before reaching the position G, preferably when it is located between the opening start position E and the closing completion position F, the rotation of the rotary support 2 is stopped and the movement of the mold means 4 is stopped. Then, the synthetic resin material 34 improperly compression-molded is taken out from the mold means 4 that is at least partially opened, and then the operation of the compression molding apparatus is resumed. When the rotation of the rotating support 2 is stopped immediately when it is detected that the synthetic resin material 34 has not been properly supplied into the molding recess 14 of the female member 10, it is downstream of the detection position B, in particular the closing completion position. The molded article 42 that is compression-molded in the mold means 4 located downstream of D is appropriately cooled and wasted without being taken out from the compression molding apparatus, and the molded article 42 is used as the mold means. Therefore, it is necessary to perform a complicated operation for manually taking out from 4.
[0021]
【The invention's effect】
According to the compression molding apparatus of the present invention, when the synthetic resin material is not properly supplied to the required part of the female mold member, this is detected, and thus the operation of the compression molding apparatus is stopped in an appropriate manner, It is possible to reliably prevent the occurrence of bad compression molding and also to reliably avoid damage to the compression molding device, in particular its mold means.
[Brief description of the drawings]
FIG. 1 is a simplified plan view of a compression molding apparatus constructed in accordance with the present invention.
FIG. 2 is a cross-sectional view showing a mold means located at a synthetic resin material supply position in the compression molding apparatus of FIG.
3 is a cross-sectional view showing a mold means located between a closing completion position and an opening start position in the compression molding apparatus of FIG. 1. FIG.
4 is a cross-sectional view showing a mold means located at a detection position in a state where a synthetic resin material is appropriately supplied in the compression molding apparatus of FIG. 1;
FIG. 5 is a cross-sectional view showing a mold means located at a detection position in a state where a synthetic resin material is not properly supplied in the compression molding apparatus of FIG. 1;
[Explanation of symbols]
4: Mold means 8: Endless path of the mold means 10: Female member 12: Male member 14: Molding recess 20: Synthetic resin material supply means 22: Molded product takeout means 44: Detection means 48: First detection Unit 50: Second detector A: Synthetic resin material supply position B: Detection position C: Closing start position D: Closing end position E: Opening start position F: Opening end position G: Molded product takeout position

Claims (5)

A plurality of mold means, a synthetic resin material supply means, and a molded product take-out means are provided. Each of the mold means is relatively opened and closed and selectively set to an open state and a closed state. And is moved through an endless path in which a synthetic resin material supply position, a closing completion position, an opening start position, and a molded product removal position are sequentially arranged, After passing through the synthetic resin material supply position, it is closed until reaching the closing completion position and set in the closed state, and after passing through the opening start position, it is opened until reaching the molded product take-out position. The synthetic resin material supply means supplies the synthetic resin material in a molten or softened state to the female mold member when the mold means passes through the synthetic resin material supply position. The molded product removal means is the mold hand. There in a compression molding device to retrieve the compacted moldings from the molding mold means when passing through the molded article removing position,
Detecting means for detecting whether or not the synthetic resin material is properly supplied into the female member at a detection position located between the synthetic resin material supply position and the closing completion position in the endless path; A compression molding apparatus characterized by comprising. The female member has a molding recess extending substantially vertically from the opened upper end, the synthetic resin material supply means drops the synthetic resin material into the molding recess from above the molding recess, and the detection means A first detector for detecting whether a synthetic resin material is present in the molding recess, and a second detector for detecting whether a synthetic resin material is present in a specific area around the molding recess; When the first detector detects a synthetic resin material but the second detector does not detect a synthetic resin material, the detection means supplies the synthetic resin material appropriately in the female member. Determining, when both the first detector and the second detector detect a synthetic resin material, the detection means determines that the synthetic resin material was not properly supplied into the female mold member, The compression molding apparatus according to claim 1. The compression molding apparatus according to claim 2, wherein each of the first detector and the second detector comprises a non-contact thermometer. The compression molding apparatus according to claim 3, wherein the non-contact thermometer is an infrared radiation thermometer. When the detection means determines that the synthetic resin material has not been properly supplied into the female mold member, the supply of the synthetic resin material by the synthetic resin supply means is immediately stopped, and the synthetic resin material is placed on the female mold member. The movement of the mold means is stopped after the mold means determined not to be properly supplied passes through the opening start position and before reaching the molded product take-out position. The compression molding apparatus in any one.

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