JP2010023303A - Method and device of compression molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide novel and improved method and device of compression molding capable of largely shortening a compression molding cycle time. <P>SOLUTION: A synthetic resin material 16 supplied between a first molding mold member 2 and one molding mold 4a of second molding mold members 4a, 4b having a plurality of molding molds is compression molded, the molding mold 4a is moved by making second molding mold members 4a, 4b after opening the mold, and a molded article 18 is taken out of the molding mold 4a of the second molding mold members 4a, 4b for holding the molded article 18 to be compression molded, and the first molding mold member 2 compression-molds the synthetic resin material 16 supplied with the other molding mold 4b of the second molding mold members 4a, 4b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a compression molding method and apparatus for compression molding a synthetic resin product such as a synthetic resin container for food and drink.

As disclosed in Patent Documents 1 and 2 below, in the conventional compression molding of synthetic resin products, one first mold member and a female member or a male member that are male members or female members. A mold having one second mold member is used. The first mold member and the second mold member are movable in directions toward and away from each other, and are set to a closed state defining a molding cavity therebetween and an open state separated from each other. The When the mold is in the open state, the softened or melted synthetic resin material is supplied to one of the first mold member and the second mold member. Next, the mold is closed and the synthetic resin material is compression molded into a molded product. Thereafter, the mold is opened again, the molded product existing on the other of the first mold member and the second mold member is taken out, and the first mold member and the second mold member are taken out. And a synthetic resin material for the next compression molding. After that, the mold is closed again, and the synthetic resin material is compression-molded into a molded product.
JP 2000-25729 A Special table 2007-508966

  Thus, in the conventional compression molding as described above, when the mold is in the open state, the synthetic resin material is supplied to one of the first mold member and the second mold member, The molded product is taken out from the other of the first mold member and the second mold member, and therefore it is necessary to keep the mold open until the removal of the molded product requiring a relatively long time is completed. In the open state, it is necessary to separate the first mold member and the second mold member from each other with a considerable distance. Shortening is limited.

  The present invention has been made in view of the above-mentioned facts, and a main technical problem thereof is to provide a new and improved compression molding method and apparatus capable of greatly reducing the compression molding cycle time. .

  As a result of diligent research, the inventors have arranged two or more second mold members for one first mold member, and specified one of the second mold members. A synthetic resin material is supplied to the individual or first mold member, and then a specific one of the second mold members is closed in cooperation with the first mold member to compress the molded product. Thereafter, the first mold member is separated from the specific one of the second mold members and the compression molded product to open the mold, and the second mold member is moved at this time. At least one of the second mold members is set in a state where it can cooperate with the first mold member, and the other one of the second mold members or the first mold member Synthetic resin material for the next compression molding is supplied, and then the other one of the second mold members and the first mold member cooperate to be closed Then, the molded product is compression-molded. On the other hand, the molded product which is compression-molded in the previous compression molding cycle and remains in a specific one of the second mold members is taken out by another one of the second mold members. It has been found that the main technical problem can be achieved by allowing the individual and the first mold member to cooperate and to be taken out after being closed.

  That is, according to one aspect of the present invention, as a compression molding method that achieves the main technical problem, one mold of a first mold member and a second mold member having a plurality of molds is provided. The second molded member that holds the molded product by compressing and molding the synthetic resin material supplied between the two and moving the molding die by moving the second molding die member after the mold is opened. A compression molding method is provided in which a molded product is taken out from the mold and the first mold member is compression molded with a synthetic resin material supplied between the second mold member and another mold.

  Preferably, the mold of the second mold member is moved by rotating the second mold member.

According to another aspect of the present invention, as a compression molding apparatus that achieves the main technical problem, a second mold having a first mold member having a mold and a plurality of molds mounted on a movable support member. A mold member of
Movable support member moving means for selectively positioning the movable support member;
Mold opening and closing means for selectively setting the first mold member to a mold open state separated from the specific one or the other one of the second mold member;
A synthetic resin material supply means for supplying the synthetic resin material;
Molded article removal means for taking out the molded article;
A compression molding apparatus is provided.

The movable support member has a first support surface and a second support surface extending in parallel with each other, and the specific one of the second mold members is mounted on the first support surface. The other one of the second mold members is mounted on the second support surface, and the movable support member is rotated about a rotation center axis extending horizontally. Is preferred.
Preferably, the first mold member has a female mold, and the second mold member has a plurality of male molds.

  In the compression molding method and apparatus of the present invention, when the first mold member is separated from a specific one of the second mold members or the other one, the second mold member is opened. It is only necessary to supply a synthetic resin material for the next compression molding to a specific one of the mold members or another one (or the first mold member instead). There is no need to remove the molded product from the other one or a specific one. Therefore, it is not necessary to hold the mold in the open state for a relatively long time, and in the open state, the first mold member and the second mold member are separated by a considerable distance. Thus, the compression molding cycle time can be greatly shortened.

  Hereinafter, preferred embodiments of a compression molding method and apparatus configured according to the present invention will be described in more detail with reference to the accompanying drawings.

  Referring to FIGS. 1A through 1J, and in particular with reference to FIG. 1A, in a preferred embodiment of the compression molding method and apparatus of the present invention, there is one female member 2 and two male members. A mold provided with mold members 4a and 4b is used. The female mold member 2 constitutes a first mold member, and the male mold members 4a and 4b constitute a second mold member.

  The female member 2 is fixed to a movable support structure (not shown) that can be moved up and down, and between the raised position shown in FIG. 1 (A) and the lowered position shown in FIG. 1 (C). Can be moved up and down. The female mold member 2 is formed with a molding recess 6 that opens downward. As will be clearly understood from the following description, the movable support structure constitutes mold opening / closing means for moving the female mold member 2 up and down to open and close the mold.

  The mold includes a movable support member 8, and two male mold members 4 are fixed to the movable support member 8. The movable support member 8 is fixed to a rotary shaft 10 that extends substantially horizontally in a direction perpendicular to the paper surface in FIG. Appropriate rotation driving means (not shown) is attached to the rotating shaft 10, and the movable support member 8 is rotated by rotating the rotating shaft 10. The movable support member 8 has a flat plate shape and includes a first support surface 12a and a second support surface 12b extending in parallel with each other. The male member 4a is mounted on the first support surface 12a of the movable support member 8, and the male member 4b is mounted on the second support surface 12b. The male mold members 4a and 4b have a truncated cone shape, and a concave depression is formed on the tip surface.

  The compression molding method using the above-described molding die will be described as follows. In FIG. 1A, the male member 4a, which is a specific one of the two male members 4a and 4b, is directed to a position (first position) that faces upward and faces the female member 2. The male member 4b, which is the other one, is positioned at a position (second position) directed downward without facing the female member 2. The female member 2 is positioned at the raised position, and the female member 2 and the male member 4a are in an open state. While the female member 2 and the male member 4a are in the open state, the synthetic resin material 16 in a softened or molten state is formed in the concave depression formed on the distal end surface of the male member 4a by the synthetic resin material supply means 14. Supply (first synthetic resin material supply step). The synthetic resin material supply means 14 itself may be of a form well known to those skilled in the art, and details of its configuration are omitted in this specification. In FIG. 1A, the male member 4b has a molded product 18 formed in the previous compression molding process.

  Next, as shown in FIGS. 1B and 1C, the female mold member 2 is lowered to close the molding die, and the synthetic resin material 16 is compression-molded into a molded product 18 having a desired shape ( First compression molding process). Thereafter, as shown in FIGS. 1D and 1E, the female mold member 2 is moved up and down to be separated from the male mold member 4a and the molded product 18 (first mold opening process). While changing from the state shown in FIG. 1C to the state shown in FIG. 1D, the molded product 18 is taken out from the male member 4b by the molded product take-out means (not shown). (Second molded product removal step). The molded product take-out means itself may be in a well-known form, and the detailed description of the configuration is omitted in this specification.

  When the molded product 18 is taken out from the male member 4b and the female member 2 is sufficiently separated from the male member 4a, the movable support member 8 is, for example, a timepiece as shown in FIGS. The male member 4b is positioned so as to face upward and face the female member 2, and the male member 4a faces downward without facing the female member 2. (First second mold member moving step).

  Next, as shown in FIG. 1 (F), while the female mold member 2 is in the raised position and the female mold member 2 and the male mold member 4b are in the open state, The synthetic resin material 16 is supplied to the concave depression formed on the tip surface of the mold member 4b (second synthetic resin material supply step). Thereafter, as shown in FIGS. 1 (G) and 1 (H), the female mold member 2 is lowered to close the molding die, and the synthetic resin material 16 is compression molded into a molded product 18 having a required shape. (Second compression molding step). Next, as shown in FIGS. (I) and (J), the female mold member 2 is raised and separated from the male mold member 4 b and the molded product 18. (Second mold opening step). During the change from the state shown in FIG. 1H to the state shown in FIG. 1I, the molded product 18 is taken out from the male member 4a by the molded product taking-out means (first molded product taking-out step). .

  When the molded product 18 is taken out from the male mold member 4a and the female mold member 2 is sufficiently separated from the male mold member 4b, the movable support member 8 is, for example, anti-reactive as shown in FIGS. 1 (I) and (J). The male member 4a is rotated upward by 180 degrees so that the male member 4a faces upward and is positioned facing the female member 2, and the male member 4b faces downward without facing the female member 2. The state, that is, the state illustrated in FIG. 1A is set (second second mold member moving step). Then, various processes illustrated in FIGS. 1A to 1J are repeatedly performed.

  Thus, in the compression molding method and apparatus configured according to the present invention as described above, when the female member 2 is separated from the male member 4a (or 4b) and is opened, the male mold It is only necessary to supply the synthetic resin material 16 for the next compression molding to the member 4a (or 4b), and it is not necessary to take out the molded product 18 from the male mold member 4b (or 4a). Therefore, it is not necessary to hold the mold in the open state for a relatively long time, and in the open state, the female member 2 and the male member 4a (or 4b) are separated from each other by a considerable distance. Thus, the compression molding cycle time can be greatly shortened.

  In the embodiment shown in FIG. 1, the first mold member 2 is arranged on the upper side, the second mold members 4a and 4b are arranged on the lower side, and the second mold member 4a or 4b is made of synthetic resin. Although the raw material 16 is supplied, if desired, the first mold member 2 is disposed below, the second mold members 4a and 4b are disposed above, and the first mold member 2 is made of synthetic resin. The material 16 can also be supplied.

  FIG. 2 shows a modification of the mold. The mold shown in FIG. 2 also includes one female mold member 102 and two male mold members 104a and 104b. The female mold member 102 constitutes a first mold member, and the male mold member 104a and the male mold member 104a. 104b constitutes a second mold member. The mold includes a movable support member 108. The movable support member 108 extends substantially horizontally, and is fixed to a rotating shaft 110 that extends substantially vertically. The male member 104a is mounted on one side of the upper surface of the movable support member 108, that is, the first support surface 112a located on the left side in FIG. 2, and the male member 104b is disposed on the other upper surface of the movable support member 108, that is, in FIG. It is mounted on the second support surface 112b located on the right side. In the state illustrated in FIG. 2, the male member 104 a is positioned at a position (first position) facing the female member 102, and the male member 104 b is lateral to the female member 102. It is positioned at a position (second position) that is displaced and does not face the female mold member 102. When the rotation shaft 110 is rotated 180 degrees by a rotation driving means (not shown) attached to the rotation shaft 110, the male member 104a is positioned to face the female member 102, and the male member 104b is It is displaced laterally relative to the female member 102.

  Even when the mold shown in FIG. 2 is used, as in the case of the mold shown in FIG. 1, the female member 102 and the male member 14a (or 104b) positioned opposite thereto are used. The synthetic resin material supply process and the compression molding process are performed between them, and the molded product 118 that has been compression-molded from the male mold member 104b (or 104a) that is displaced with respect to the female mold member 102 is taken out (molded product ejection process). ) Is performed.

  FIG. 3 shows still another modification of the mold. 3 includes one female mold member 202 and four male mold members 104a, 104b, 104c, and 104d. The female mold member 202 constitutes a first mold member, and is male. The mold members 104a, 104b, 104c and 104d constitute a second mold member. The mold includes a movable support member 208 having a substantially cubic shape. The movable support member 208 is fixed to a rotating shaft 210 that extends substantially horizontally in a direction perpendicular to the paper surface in FIG. The movable support member 208 has four flat support surfaces 212a, 212b, 212c and 212d, and male members 104a, 104b, 104c and 104d are mounted on the support surfaces 212a, 212b, 212c and 212d, respectively. . The movable supporting member 208 is rotated 90 degrees every 90 degrees by a rotation driving means (not shown) attached to the rotating shaft 210, and the male members 104a, 104b, 104c and 104d are directed upward and are female. Position facing the member 202 (the male member 204a is located in FIG. 3), standby position pointing leftward in FIG. 3 (the male member 204b is located in FIG. 3), FIG. In FIG. 3, a standby position pointing downward (male member 204c is positioned in FIG. 3) and a standby position pointing rightward in FIG. 3 (male member 204d is positioned in FIG. 3) are sequentially provided. It is located in.

  When the mold shown in FIG. 3 is used, as in the case of the mold shown in FIG. 1, the female member 202 and the male member positioned opposite thereto (in FIG. 3, the male member 204a). A synthetic resin material supply process and compression molding are performed between the two. Then, the compression molded product 218 is taken out from the male member (male member 204d in FIG. 3) oriented rightward in FIG. 3 (molded product extraction step). The time during which the male member is present at the position pointing left in FIG. 3 (male member 204b in FIG. 3) and the position pointing downward in FIG. 3 (male member 204c in FIG. 3) is compression-molded. The molded product 218 can be used for cooling. If desired, while the male member is in a position pointing left in FIG. 3 (male member 204b in FIG. 3) and in a position pointing downward in FIG. 3 (male member 204c in FIG. 3). The compression molded article 218 can be appropriately subjected to additional processing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified cross-sectional view showing various steps in a preferred embodiment of a compression molding method configured according to the present invention. The simplified sectional view showing the modification of a forming die. The simplified sectional view showing other modifications of a forming die.

Explanation of symbols

2: Female member (first mold member)
4a: Male member (second mold member)
4b: Male member (second molding member)
8: Movable support member 14: Synthetic resin material supply means 16: Synthetic resin material 18: Molded product 102: Female mold member (first mold member)
104a: male mold member (second mold member)
104b: Male member (second mold member)
108: movable support member 118: molded product 202: female mold member (first mold member)
204a: Male member (second mold member)
204b: Male mold member (second mold member)
204c: Male mold member (second mold member)
204d: Male mold member (second mold member)
208: Movable support member 218: Molded product

Claims (5)

  The synthetic resin material supplied between the first mold member and one mold of the second mold member having a plurality of molds is compression-molded, and after the mold is opened, the second mold member The molded product is taken out from the molding die of the second molding member holding the compression molded product by moving the molding die, and the first molding die member is the second molding die member. A compression molding method in which a synthetic resin material supplied between other molding dies is compression molded.   The compression molding method according to claim 1, wherein the mold of the second mold member is moved by the rotation of the second mold member. A first mold member having a mold and a second mold member having a plurality of molds mounted on the movable support member;
Movable support member moving means for selectively positioning the movable support member;
Mold opening and closing means for selectively setting the first mold member to a mold open state separated from the specific one or the other one of the second mold member;
A synthetic resin material supply means for supplying the synthetic resin material;
Molded article removal means for taking out the molded article;
A compression molding apparatus comprising: The movable support member has a first support surface and a second support surface that extend parallel to each other, and the specific one of the second mold members is on the first support surface. The other one of the second mold members is mounted on the second support surface, and the movable support member is rotated about a rotation center axis extending horizontally.
The compression molding apparatus according to claim 3.   The compression molding apparatus according to claim 3 or 4, wherein the first mold member has a female mold, and the second mold member has a plurality of male molds.

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