JPH0572413U - Cartridge for temperature control - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to make it easy to use as various heating means or cooling means by flowing a heating medium or a cooling medium inside. [Structure] The inflow pipe (11) is inserted from the outside of one end to the inside of the cylindrical body (10) closed at both ends, leaving a space between the outside and the other end, and the inflow is made. Plumbing (11)
The outflow pipe (12) is provided near the one end that penetrates the inside of the pipe, and the spiral partition (13) is formed between the inner surface of the cylindrical body (10) and the outer surface of the inflow pipe (11). And a flow passage (14) for communicating the insertion end of the inflow pipe (11) with the open end of the outflow pipe (12) is provided, and the flow passage (14) is extended from the inflow pipe (11).
A heating medium or a cooling medium is caused to flow through the outflow pipe (12).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used, for example, as a heating heater for heating a mold by being installed in a heating chamber behind the molding space side of a mold for in-mold foam molding composed of a pair of molds, or other various heating means. In addition, the present invention relates to a cartridge for temperature adjustment which is widely used as a cooling means.

[0002]

[Prior Art]

 Conventionally, foamed synthetic resin molded articles have been molded with an in-mold foam molding mold composed of a pair of molds.

In such an in-mold foam molding mold, after closing the mold and filling the foaming synthetic resin raw material particles in the molding space, the mold is heated with steam, and then cooling water or the like is used. The mold is cooled by, and the raw material particles are foamed and fused to form a molded product.

[0004]

[Problems to be solved by the device]

 However, since the surface of such molded products is composed of a thin film in which the skins of the expandable synthetic resin raw material particles are connected in a hexagonal shape, the surface of the molded product will be rubbed or hit by other objects. A peeling phenomenon or a depression phenomenon easily occurs.

Under these circumstances, it is conceivable to form a resin film on a portion where another object may be rubbed or hit and a peeling phenomenon or a depression phenomenon may occur. However, in order to form such a resin film, it is necessary to perform a troublesome work such as attaching a non-foamed synthetic resin sheet in a later step. It is also possible to form a resin coating on these parts by heating the mold to a temperature higher than the normal foam molding temperature in the in-mold foam molding process to heat and melt the raw material particles. Since heating of the mold is performed by supplying steam, when a conventional mold is used, high-pressure steam is required, which is a structural and operational problem.

The temperature control cartridge according to the present invention has been devised in view of the above problems, and the original purpose is to make a heating medium flow inside to form a mold composed of a pair of molds. It is installed as a heating heater in the heating chamber behind the molding space side of at least one of the molds for internal foam molding, and this mold is heated above the melting temperature of the expandable synthetic resin raw material particles to be especially molded. This is to form a resin coating on at least a part of the surface of the foamed synthetic resin molded article by heating and melting the raw material particles during the in-mold foaming molding process.

However, in addition to the case of heating the in-mold foam molding die particularly above the melting temperature of the raw material particles, it can be used as a heating heater for heating such a die to a normal foam molding temperature, or other Not only as various heating means, but also as a temperature adjusting means for causing a cooling medium to flow inside to be used as a cooling medium.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, according to claim 1 of the present invention, one tubular body is separated from the outside to the inside and the other end along substantially the axial center of the cylindrical main body whose both ends are closed. The other tube is installed near the one end where one tube penetrates and the other tube is seen from the outside to the inside, and the spiral shape is formed between the inner surface of the cylindrical body and the outer surface of the one tube. A partition wall is formed to provide a flow passage that connects the insertion end of one pipe body and the open end of the other pipe body, and one pipe body and the other pipe body are used as inflow piping and the other as outflow piping. A temperature control cartridge was constructed by flowing a heating medium or a cooling medium from the inflow pipe to the outflow pipe through the flow passage. Further, in claim 2, the heating medium is exemplified as heating oil.

[0009]

[Action]

 Thus, such a temperature control cartridge is configured such that a heating medium is caused to flow inside, and a heating chamber behind at least one of the molds for in-mold foam molding is formed on the molding space side. As a heater, the mold is heated to above the melting temperature of the foamable synthetic resin raw material particles, and at least part of the surface of the foamed synthetic resin molded product to be molded is used as a raw material during the in-mold foam molding process. It is used when the particles are heated and melted to form a resin film. Further, in addition to heating the mold to a normal foam molding temperature, or as various other heating means, it is also used as a cooling means by flowing a cooling medium inside.

[0010]

【Example】

 The temperature control cartridge according to the present invention will be described in detail with reference to the accompanying drawings.

In the illustrated embodiment, such a temperature control cartridge is provided with one of the molds for in-mold foam molding which comprises a pair of molds as shown in FIG. It is installed as a heater in the heating chamber behind the mold space, and this mold is heated above the melting temperature of the expandable synthetic resin raw material particles to form at least a part of the surface of the expanded synthetic resin molded product to be molded. A case where the raw material particles are heated and melted in the in-mold foam molding process to be used for forming a resin film will be described.

This in-mold foam molding die is composed of a pair of a cavity die shown as 1 in FIG. 1 and a core die shown as 2 in the same manner as in the conventional case, and when the die is closed, As shown in the figure, a molding space 3 for the foamed synthetic resin molded product is formed between the two. The core mold 2 is arranged laterally on the right side of the drawing with respect to the cavity mold 1 so that the mold can be opened. Reference numeral 4 denotes a raw material filling feeder for supplying expandable synthetic resin raw material particles into a molding space 3 formed between a pair of closed cavity mold 1 and a core mold 2 provided on the cavity mold 1 side, Reference numerals 5 and 6 denote heating chambers formed behind the cavity mold 1 and the core mold 2 on the molding space 3 side. Reference numeral 7 in the drawing denotes a temperature adjusting cartridge according to the present invention arranged in the heating chamber 5 of the core mold 2, which is a mounting recess provided on the rear side of the core mold 2 on the side of the molding space 3. It is used as a heater by attaching one end of it to 8 and attaching it. Then, with this, the molding space 3 side of the core mold 2 is heated to the melting temperature of the raw material particles or higher. In addition to these, in the mold, a steam pipe for supplying steam to the heating chamber 5 of the cavity mold 1, a water pipe for supplying cooling water to the heating chambers 5 and 6 of the cavity mold 1 and the core mold 2, A drain pipe for draining water and a release pin for releasing the molded product are provided, but they are not shown.

As shown in FIG. 2, the temperature control cartridge 7 has one tube body serving as an inflow pipe 11 substantially along the axial center of a cylindrical main body 10 having both ends closed by side plates 9. To the inside of the side plate 9 on the right side in the drawing which is one end of the side plate 9 on the left side in the drawing, which is the other end, while leaving a gap between the side plate 9 on the right side in the drawing and the side plate 9 on the other side of the drawing. The other tubular body serving as the outflow pipe 12 is provided from the outside to the inside of the tubular main body 10 along with, and as shown in the figure, a spiral partition wall 13 is provided between the inner surface of the tubular main body 10 and the outer surface of the inflow pipe 11. Is formed to connect the insertion end of the inflow pipe 11 and the open end of the outflow pipe 12 with each other, and a heating oil serving as a heating medium is made to flow from the inflow pipe 11 to the outflow pipe 12 through the flow passage 14. is there. It can be said that at least the cylindrical main body 10 of the temperature control cartridge 7 is preferably made of copper or aluminum, which has good thermal conductivity, from the aspect.

As shown in FIG. 1, a large number of such temperature control cartridges 7 are provided behind the molding space 3 side of the core mold 2, and the mounting recesses 8 are provided on the side opposite to the insertion side of the inflow pipe 11. The inlet pipe 11 is connected to the supply pipe 15, the outlet pipe 12 is connected to the discharge pipe 16, and their ends are provided outside the mold. In addition, the heating oil is constantly heated and made to flow at a temperature at which the molding space 3 side of the core mold 2 can be heated to a temperature higher than the melting temperature of the raw material particles. In the figure, 18 and 19 are valves provided in the middle of the supply pipe 15 and the discharge pipe 16.

On the molding space 3 side of the core mold 2 to which the temperature adjusting cartridge 7 is attached, a communication port for communicating with the heating chamber 6 behind the mold is usually not provided unlike the conventional mold. However, it is also possible to provide them as needed.

On the other hand, since the cavity mold 1 has the same form as the conventional mold, a communication port for communicating with the heating chamber 5 behind it is provided on the molding space 3 side.

In such an in-mold foam molding die, a foam synthetic resin molded product is molded as follows. First, of the pair of molds, the core mold 2 is heated in advance by heating the heating oil that flows inside the temperature control cartridge 7 to a temperature at which the molding space 3 side can be heated above the melting temperature of the foamable synthetic resin raw material particles. At the same time, the pair of cavity mold 1 and core mold 2 are closed with a required gap left therebetween. Any one of these operations may be performed before the other or simultaneously. Next, raw material particles are filled into the molding space 3 formed between the pair of cavity mold 1 and the core mold 2 through the raw material filling feeder 4 provided on the cavity mold 1 side. After that, the pair of cavity mold 1 and core mold 2 are completely closed. Then, the core mold 2 heated by the temperature control cartridge 7 is cooled by supplying cooling water to the heating chamber 6 behind it. At this time, the raw material particles in contact with the molding space 3 side of the core mold 2 are once heated and melted to form a molten resin layer, and then solidified and fused with the raw material particles behind. Thus, a resin coating is formed on the entire surface of the core mold 2 on the side of the molding space 3 in which the molten resin layer in which the raw material particles are heated and fused is solidified in a state of being fused with the raw material particles behind. Next, steam is supplied to the heating chamber 5 behind the cavity mold 1 and heated to a normal foam molding temperature to foam-melt the raw material particles in the molding space 3. After that, the cavity mold 1 is cooled by supplying cooling water to the heating chamber 5 behind it. In this way, in the in-mold foam molding process, the resin coating is formed on the portion corresponding to the entire surface of the molding space 3 side of the core mold 2, and the raw material particles behind this are fused and the raw material particles are A fused product is molded. Then, such a molded product is taken out of the molding space 3 by opening a pair of the cavity mold 1 and the core mold 2 and operating a release pin (not shown) provided on the cavity mold 1 side, for example. Of. Then, by repeating such operations, the molded products are sequentially foam-molded.

Here, as the resin forming the expandable synthetic resin raw material particles, a styrene resin represented by polystyrene, a polyolefin resin represented by polyethylene or polypropylene, and various other copolymer synthetic resins are used. Available.

In these raw material particles, the core mold 2 may be heated to, for example, 185 ° C. or higher, preferably about 185 to 200 ° C. Further, in ordinary foam molding, the mold temperature may be set to, for example, about 105 to 110 ° C.

Silicon oil, alkyldiphenyl, or the like can be used as the heating oil for heating the temperature adjusting cartridge 7.

The gap when the raw material particles left between the pair of cavity mold 1 and the core mold 2 are filled in the molding space 3 depends on the expansion ratio of the raw material particles and the thickness of the resin coating film to be formed. Although it is appropriately set, when the foaming ratio of the raw material particles is 30 times and a resin film having a thickness of about 0.5 mm is formed on the surface, such a gap may be about 15 mm. Since this is a larger gap than in the case of the usual cracking filling of about 5 mm, the length of the abutting portion formed between the pair of cavity mold 1 and core mold 2 is It can be said that it is preferable to set a larger value than in normal foam molding.

In the illustrated embodiment, the heating of the core mold 2 by the temperature adjusting cartridge 7 may be performed simultaneously with the heating of the cavity mold 1 after the raw material particles are filled.

Since the core mold 2 to which such a temperature adjusting cartridge 7 is attached is not particularly heated by steam, it is not necessary to provide a communication port for connecting the molding space 3 side and the heating chamber 6 behind the molding space 3. Further, in design, only the foaming pressure needs to be targeted, the structure is simplified, and the thickness can be relatively reduced. Further, when the thickness of the core mold 2 is reduced, the amount of cooling water used is also reduced, which is effective in preventing the high water content phenomenon of the molded product.

Further, in such an in-mold foam molding die, it is also possible to lower the heating temperature of the heating oil flowing inside the temperature adjusting cartridge 7 and use it for ordinary foam molding.

Regardless of the illustrated embodiment, such a temperature adjusting cartridge 7 can be used not only as a heater for heating a mold but also as various heating means. In this case, depending on the heating temperature of the object to be used, it is also possible to use various liquid or gaseous media such as hot water and steam as the heating medium.

Further, a cooling medium can be made to flow inside and used as a cooling means.

Further, it is also considered as appropriate to provide a mounting means such as a mounting flange or a screw portion on the outer surface of the cylindrical main body.

[0028]

[Effect of the device]

 The temperature control cartridge according to the present invention as described above can be widely used as various heating means or cooling means by appropriately selecting a heating medium or a cooling medium that flows inside.

Further, since the spiral partition wall is provided between the double pipes, the structure is simple, and the tubular body is relatively small for the length of the flow passage, and the inflow pipe is It can be used simply by flowing a heating medium or a cooling medium into the interior through the, so the operation is simple.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold showing a state in which a temperature controlling cartridge according to the present invention is installed as a heater in an in-mold foam molding mold.

FIG. 2 is a sectional view showing a temperature control cartridge according to the present invention.

[Explanation of symbols]

 1 Cavity Mold 2 Core Mold 3 Molding Space 4 Raw Material Filling Fidder 5 Heating Chamber 6 Heating Chamber 7 Temperature Control Cartridge 8 Mounting Recess 9 Side Plate 10 Cylindrical Body 11 Inflow Pipe 12 Outflow Pipe 13 Partition 14 Flow Passage 15 Supply Pipe 16 Discharge pipe 17 Heating tank 18 Valve 19 Valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Nakamura 890-3 Hishiki, Sakai-shi Sanpo Mold Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A tubular body, which is closed at both ends thereof, is inserted substantially along the axial center of the tubular body from the outside of one end to the inside of the tubular body while leaving a gap between the other end and the one pipe. The other tubular body is provided near the one end that penetrates the body from the outside to the inside, and a spiral partition wall is formed between the inner surface of the tubular main body and the outer surface of the one tubular body. A heating medium is provided from the inflow pipe through the flow passage to the outflow pipe by providing a flow passage that connects the insertion end and the open end of the other pipe body with one of the one pipe and the other pipe as the inflow pipe and the other as the outflow pipe. Alternatively, a cartridge for temperature control in which a cooling medium is made to flow. 2. The temperature controlling cartridge according to claim 1, wherein the heating medium is heating oil.