JP5227610B2 - Insert molding die and composite sheet insert molding method - Google Patents

Description

  The present invention relates to an insert molding die for molding a composite sheet body in which a sheet body and a resin portion are integrally formed, and an insert molding method for the composite sheet body.

  A composite sheet body in which a resin portion is integrally formed on the periphery of a sheet body such as a sheet-like bag or a resin film and a predetermined function is imparted to the sheet body may be manufactured. For example, in a standing pouch, the reinforcing ribs of the resin part are integrally formed by insert molding on both side edges of the periphery of the sheet-like bag, and the filling is reduced as a matter of course. Even if the pouch is bent, it has the function of not falling. When the sheet body is inserted into a recess formed between the fixed mold and the movable mold, and a composite sheet body is molded integrally with the resin portion by injecting molten resin to the periphery of the sheet body, the width dimension of the sheet body is Must be the same size as the inner dimension of the recess. If the size of the sheet body is smaller than the inner size of the recess, a gap is generated between the sheet body and the recess, and due to the gap, molten resin leaks from the end of the formed resin part, and burrs are generated in the sheet body. (See FIG. 10A). Also, if the size of the sheet body is larger than the inner size of the recess, a part of the sheet body protrudes, and the molten resin leaks from the gap formed by the protruding portion being sandwiched between the fixed mold and the movable mold, and burrs are generated. There is a problem (see FIG. 10B). When burrs occur, for example, when the composite sheet is a standing pouch, there is a risk that the burrs attached to the surface of the standing pouch will be scattered and mixed into the food and drink when filling the food and drink. There is. On the other hand, when the sheet body is cut into a predetermined size using a cutting tool, there is a problem that it is difficult to cut to a size that sufficiently satisfies the dimensional accuracy required for avoiding the above problems due to large dimensional variations. There is.

  Conventionally, there are proposals for an insert molding die for manufacturing a composite sheet body from a sheet body and a method for forming the composite sheet body (see Patent Document 1 and Patent Document 2).

JP-A-9-225960 JP 2000-158487 A

  However, the conventional invention does not propose solving the problem caused by the leakage of the molten resin from the end portion of the formed resin portion due to the unstable dimensional accuracy of the sheet body.

  The present invention has been made in view of the above circumstances, and due to unstable dimensional accuracy of the sheet body and dimensional variation, molten resin leaks from the end of the formed resin portion, and burrs are generated in the composite sheet body. It is an object of the present invention to provide an insert molding die and a composite sheet body insert molding method that can prevent this.

  In order to solve the above problems, the present inventors have conceived the following invention. That is, the present invention inserts a sheet body into a recess formed between a fixed mold and a movable mold, injects a molten resin into a cavity to form a resin section on the periphery of the sheet body, An insert molding die for molding a composite sheet body in which a resin portion is integrally formed, wherein the concave portion is set to an inner dimension in which the sheet body is not sandwiched between the fixed mold and the movable mold, The fixed mold and the movable mold cut and cut a part of the sheet body located at the end of the formed resin part prior to the injection of the molten resin, and seal the cut surface of the sheet body The gist of the mold for insert molding is characterized in that a cutting sealing means is provided.

  According to the invention of the above configuration, the cutting and sealing means cuts and cuts a part of the sheet body located at the end of the resin portion to be formed, and seals the cut portion so that the sheet body and the concave portion are sealed. Since the gap between them is closed, leakage of the molten resin from the end portion of the resin portion due to instability of the dimensional accuracy of the sheet body can be prevented. The sheet body is not particularly limited as long as it has a sheet shape, and examples thereof include a resin bag and a resin film, and the sheet body material is not limited to a resin as long as the material of the sheet body is also a sheet shape.

  The composite sheet formed by the insert molding die may be a standing pouch.

  The present invention is an insert molding method for a composite sheet body in which a resin portion is formed on the periphery of a sheet body, wherein the sheet body is set to an internal size so as not to be sandwiched between a stationary mold and a movable mold. The sheet body is inserted into a recess formed between the movable mold and the mold, and after the mold is closed, it is positioned at the end of the resin portion formed by the cutting and sealing means provided in the fixed mold and the movable mold A part of the sheet body is cut and cut prior to injection of the molten resin, the cut surface of the sheet body is sealed, the molten resin is then injected into the cavity, and the molten resin from the end of the resin portion is injected. The gist is an insert molding method for a composite sheet, which is characterized by preventing leakage.

  Since the mold for insert molding of the present invention can prevent the molten resin from leaking from the end portion of the resin portion formed on the sheet body, it is possible to reliably prevent the occurrence of burrs, and to produce a good quality composite sheet body. Can be manufactured with increased yield.

  When forming a standing pouch using the mold for insert molding of the present invention, in addition to the above effects, the reinforcing rib of the resin part can provide a function that the pouch does not bend or fall even if the filling is reduced, Since burrs do not occur, it is possible to avoid the risk of burrs being mixed when filling foods and drinks.

  The insert molding method for a composite sheet according to the present invention can easily and efficiently produce a composite sheet that can prevent the occurrence of burrs without leakage of molten resin from the end of the resin part formed on the sheet. .

  Hereinafter, a method for forming the insert molding die 100 and the composite sheet A according to the present invention will be described with reference to the drawings in the case where the resin portions 80 are formed on both side edges 85 of the sheet B. The present invention is not limited to the following embodiment as long as it is included in the technical scope.

  A recess 40 is formed in the fixed mold 30, and the sheet body B is inserted into the recess 40 (see FIGS. 1 and 2). The recess 40 is set to an internal dimension in which the sheet body B is not sandwiched between the movable mold 10 and the fixed mold 30, and the width between both side edges 85 where the resin part 80 of the sheet body B is formed is the internal dimension of the recess 40. Set smaller. As a result, a gap S is formed between both side edges 85 of the sheet body B and the recessed portion 40 (see FIGS. 2 and 3), the sheet body B protrudes from the recessed portion 40, and the protruding portion is located between the movable mold 10 and the fixed mold 30. Generation | occurrence | production of the burr | flash resulting from being pinched | interposed between can be prevented. In addition, it can also be set as the structure which forms a 1st recessed part and a 2nd recessed part in the movable mold | type 10 and the fixed mold | type 30, respectively, and forms a recessed part by both by mold closing.

  A first cavity 11 is formed in the movable mold 10, and a second cavity 31 is formed in the fixed mold 30, and both form a cavity 50 by closing the mold. The cavity 50 communicates with the recess 40. Further, molten resin is injected into the cavity 50 through a gate 60 from a known runner (not shown), and resin portions 80 are formed on both side edges 85 of the sheet body B, respectively.

  The movable mold 10 and the fixed mold 30 are provided with a cutting and sealing means 90 in order to prevent the molten resin from leaking from the end of the resin portion 80. Below, the cutting sealing means 90 is demonstrated.

  The movable mold 10 and the fixed mold 30 have rectangular perforations 12 and 32 that are communicated by closing the mold to a cutting portion C that is a part of the sheet body B located at the end of the resin portion 80 to be formed. Are formed respectively. In the perforation 12 of the movable mold 10, there is accommodated a quadrangular prism-shaped cutting portion 13 that is driven to move forward and backward by the action of air from the drive source 15. A cutting blade 14 is formed at the tip of the cutting portion 13. The material of the cutting part 13 can be adopted without particular limitation as long as it is a material having rigidity and heat resistance. The drive source 15 is not limited to air as long as the cutting unit 13 can be driven so as to be able to advance and retreat. For example, the drive source 15 may be driven by hydraulic pressure or may be driven by a motor.

  A cutting blade 34 is formed at the distal end of the perforation 32 of the fixed mold 30 on the movable mold 10 side so as to be in contact with the cutting portion C when the mold is closed and mesh with the cutting blade 14 of the cutting portion 13. The perforation 32 is maintained at a negative pressure by a vacuum circuit (not shown).

  The cutting and sealing means 90 described above can be modified as follows. As long as the cut portion C of the sheet body can be cut and the cut surface can be sealed, the perforations 12 and 32 are not limited to a square shape in cross-sectional view, and may be circular in cross-sectional view and the cut portion may be cylindrical. Further, the cutting portion 13 has a fixed structure that does not advance and retreat, the tip of the cutting portion 13 protrudes from the movable mold 10, and the cutting portion C of the sheet body B is cut by the cutting blade 14 formed at the tip of the cutting portion 13 by closing the die. It is good also as a structure cut out. Further, the cutting and sealing means 90 may be configured in the reverse manner with the movable mold 10 and the fixed mold 30.

  Next, the action of the insert molding die 100 for molding the composite sheet A configured as described above and the insert molding method of the composite sheet A will be described.

  In order to form the composite sheet A, the sheet B is inserted into the recess 40 (see FIG. 2). The width between the side edges 85 on which the resin portion 80 of the sheet body B is formed is set to be smaller than the inner dimension of the concave portion 40, and a gap S is formed between the both side edges 85 of the sheet body B and the concave portion 40. (See FIGS. 1 and 3).

After closing the mold, the cutting portion 13 that has been retracted so as not to interfere with the sheet body B is driven by the action of air and moves forward in the perforation 12 toward the fixed mold 30 (see FIG. 4). The cutting part 13 can advance while sliding on the inner wall surface of the perforation 12, and can cut and cut the cutting portion C (see FIG. 5).
When cutting the cutting portion C of the sheet body B, the cutting blade 14 formed at the tip of the cutting portion 13 and the cutting blade 34 formed at the tip of the perforation 32 are each configured by a relationship between a male blade and a female blade. The cutting part C of the body B can be cut sharply and cut out. Advancement of the cutting part 13 is stopped in a state in which a part of the distal end side of the cutting part 13 enters the perforation 32, and the cut piece C1 entering the perforation 32 is insert-molded from the inside of the perforation 32 maintained at a negative pressure. It is discharged out of the metal mold 100 (see FIG. 5).

  Next, molten resin is injected from the gate 60 into the cavity 50, and the resin portions 80 are formed on both side edges 85 of the sheet B (see FIGS. 6 and 7). The resin portion 80 can be used without particular limitation as long as it is a material that can be injection-molded, and examples thereof include thermoplastic resins, elastomers, and rubbers. When the molten resin is injected, the cutting part 13 seals the cut surface of the sheet body B, so that the gap S at the end of the resin part 80 is closed and leakage of the molten resin is prevented, and as a result, burrs are generated. Can be prevented. After the injection of the molten resin, the cutting part 13 is driven and retracted by the action of air in the reverse direction, and the mold is opened (see FIG. 8).

  The sheet A is released from the insert molding die 100 and has a shape in which the cut portion C of the sheet B located at the end of the resin portion 80 is cut out by the cutting and sealing means 90 (see FIG. 9). ).

  Thus, even if the width dimension between the side edges 85 on which the resin portion 80 is formed is smaller than the inner dimension of the recess 40 and is not the same as the inner dimension of the recess 40, It is possible to easily and efficiently manufacture the composite sheet A that can prevent the molten resin from leaking from the gap S and reliably prevent the generation of burrs.

(A) The top view of the fixed mold | type of the state by which the mold for insert molding which concerns on embodiment was opened. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). (A) The top view of the fixed mold | type in which the sheet | seat body was inserted in the state by which the mold for insert molding which concerns on embodiment was opened. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). The figure which shows the state which cut | disconnected the movable type | mold and the fixed type | mold at the position of the BB line of Fig.2 (a). (A) The top view of the fixed mold | type which shows the state by which the mold for insert molding which concerns on embodiment was closed. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). (A) The top view of the fixed mold | type which shows the state by which the metal mold | die for insert molding which concerns on embodiment was closed, the cutting part advanced, and the cut location of the sheet | seat body was cut and cut out. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). (A) The top view of the fixed mold | type which shows the state by which the metal mold | die for insert molding which concerns on embodiment is closed, a cutting part seals a cutting location, and molten resin is inject | emitted. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). (A) The top view of a fixed mold | type which shows the state which the injection | pouring of molten resin of the metal mold | die for insert molding which concerns on embodiment was complete | finished. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). (A) The top view of the fixed mold | type which shows the state by which the mold | type was closed and opened after completion | finish of injection | pouring of the molten resin of the metal mold | die for insert molding which concerns on embodiment. (B) The figure which shows the state which cut | disconnected the movable mold | type and the fixed mold | type at the position of the AA line of (a). The top view of the composite sheet body shape | molded by the metal mold | die for insert molding which concerns on embodiment. (A) Explanatory drawing which shows that the dimension of a sheet | seat body is smaller than the internal dimension of a recessed part, and a clearance gap arises between a sheet | seat body and a recessed part. (B) Explanatory drawing which shows the case where the dimension of a sheet | seat body is larger than the internal dimension of a recessed part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Movable type 11 1st cavity 12, 32 Perforation 13 Cutting part 14, 34 Cutting blade 30 Fixed mold 31 2nd cavity 40 Recess 50 Cavity 80 Resin part A Composite sheet body B Sheet body C Cutting location C1 Cutting piece 90 Cutting sealing Means 100 Insert Mold

Claims (3)

  A sheet body is inserted into a recess formed between the fixed mold and the movable mold, a molten resin is injected into the cavity to form a resin portion on the periphery of the sheet body, and the sheet body and the resin portion are integrally formed. An insert molding die for molding a composite sheet body, wherein the recess is set to an inner dimension such that the sheet body is not sandwiched between the fixed mold and the movable mold, and the fixed mold and the movable mold The mold is provided with cutting and sealing means for cutting and cutting out a part of the sheet body located at the end of the resin part to be formed prior to injection of the molten resin and sealing the cut surface of the sheet body The mold for insert molding characterized by being made.   The mold for insert molding according to claim 1, wherein the composite sheet body is a standing pouch.   An insert molding method for a composite sheet body in which a resin portion is formed on the periphery of the sheet body, wherein the fixed body and the movable mold are set so that the sheet body is not sandwiched between the stationary mold and the movable mold. The sheet body is inserted into a recess formed between the two, and after the mold is closed, the sheet body positioned at the end of the resin portion is formed by the cutting and sealing means provided in the fixed mold and the movable mold. A part is cut and cut prior to the injection of the molten resin, the cut surface of the sheet body is sealed, and then the molten resin is injected into the cavity to prevent leakage of the molten resin from the end of the resin part. A method for insert molding a composite sheet body.

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