JP7089660B2 - Hollow molded panel - Google Patents

Description

The present invention relates to a hollow molded panel, and more particularly to an improvement of a flexible hollow molded panel.

Techniques for manufacturing a hollow molded panel having a flow path by laminating two grooved resin sheets have been proposed in various fields.

For example, Patent Document 1 is a hollow molded product in which a first resin sheet and a second resin sheet are partially welded, and a flow path is provided between the first resin sheet and the second resin sheet. , The flow path is communicated with a protruding cylinder that protrudes from the side surface of the hollow molded product and has an opening at the tip, and the protruding cylinder is disclosed by the hollow molded product formed by the first resin sheet and the second resin sheet. Has been done. The use of the hollow molded product described in Patent Document 1 is, for example, a heat collector, a hot water panel, or the like.

Further, Patent Document 2 has a plurality of cells in which a fluid is fluidly enclosed and is long formed in a first direction from the back to the buttocks, and the cells are perpendicular to the first direction. A plurality of bedding pads provided in parallel along two directions are disclosed.

Further, Patent Document 3 discloses a flat plate-shaped resin heat transfer unit having an internal flow path of a fluid for heat dissipation or heat receiving, which enables efficient manufacturing while maintaining efficient heat exchange. A method for manufacturing a resin heat transfer unit is disclosed. The resin heat transfer unit disclosed in Patent Document 3 is, for example, a floor heating panel unit.

JP-A-2015-199241 Japanese Unexamined Patent Publication No. 2013-341 Japanese Unexamined Patent Publication No. 2013-49186

By the way, in this kind of hollow molded panel, if flexibility can be imparted, it is expected that the degree of freedom in arrangement and mounting of the panel will increase, and new applications will be created. For example, if the hollow molded panel can be curved, it can be attached to any part of the human body and can be used as a heating panel or a cooling panel. Further, even in the bedding pad as disclosed in Patent Document 2, if it has flexibility, the hollow molded panel is deformed according to the posture and the like, and the feeling of use is good. It is expected to become.

The present invention has been proposed in view of the above-mentioned conventional circumstances, has good flexibility, can reliably secure a flow path even when bent, and has an excellent appearance. It is an object of the present invention to provide a hollow molded panel.

In order to achieve the above-mentioned object, the hollow molded panel of the present invention is formed by partially welding the first resin sheet and the second resin sheet, and a flow path is provided between the first resin sheet and the second resin sheet. Is a hollow molded panel having flexibility in which hot water or cold water is circulated in the flow path and deforms into an arbitrary shape along a human body or various articles, and the first resin is provided. The sheet and the second resin sheet contain a styrene-based elastomer and a polyolefin, and the content of the styrene-based elastomer is 65% by mass to 70% by mass, and the content of the polyolefin is 30% by mass to 35% by mass. It is characterized by that.

Elastomer is a material with excellent flexibility, and it is considered that good flexibility can be realized by molding a hollow molded panel with a resin sheet containing an elastomer as a main component. However, in a hollow molded panel having flexibility such that the entire panel is curved and used, if the panel is formed mainly by a flexible elastomer, the flow path is crushed when the panel is curved. , There is a problem that it is difficult to realize sufficient distribution.

In addition, when considering molding, molding a resin sheet containing only an elastomer as a main component causes stickiness, and so-called sharkskin is observed on the surface of the molded hollow molded panel, which tends to spoil the appearance of the product. There is a factor that impairs the product value.

In the hollow molded panel of the present invention, since polypropylene is blended in an appropriate amount in the styrene-based elastomer, sufficient flexibility is ensured, and crushing of the flow path and inconvenience in appearance are eliminated.

According to the present invention, it is possible to provide a hollow molded panel which has good flexibility, can surely secure a flow path even when bent, and has an excellent appearance.

It is a schematic perspective view which shows an example of a hollow molded panel. FIG. 3 is a schematic cross-sectional view of the hollow molded panel shown in FIG. 1. It is a figure which shows an example of the molding apparatus of a hollow molded panel.

Hereinafter, embodiments of the hollow molded panel to which the present invention is applied will be described in detail with reference to the drawings.

As shown in FIG. 1, the hollow molded panel 1 of the embodiment of the present invention is configured by superimposing the first resin sheet 2 and the second resin sheet 3 and partially welding them. The boundary between the first resin sheet 2 and the second resin sheet 3 is provided as a so-called parting line at substantially the center in the thickness direction of the hollow molded panel 1.

Further, in the first resin sheet 2 and the second resin sheet 3, the flow path portions 2a and 3a formed in a substantially semicircular cross section are formed in a meandering shape, and the flow path portions 2a and 3a face each other. By welding and joining the first resin sheet 2 and the second resin sheet 3 in this way, a flow path 4 having a substantially circular cross section is formed.

The flow path 4 communicates with protruding cylinders 5a and 5b protruding from the side surface of the hollow molded panel 1. An opening is provided at the tip of the protruding cylinders 5a and 5b, and a supply tube (not shown) for supplying the liquid into the flow path 4 and a discharge tube for discharging the liquid from the flow path 4 (not shown). By connecting (not shown) to these projecting cylinders 5a and 5b, the liquid can be circulated in the flow path 4.

The fluid to be circulated in the flow path 4 is arbitrary. For example, if a heated liquid (hot water or the like) is circulated in the flow path 4, the hollow molded panel 1 functions as a heating panel. If the cooled liquid (cold water or the like) is circulated in the flow path 4, the hollow molded panel 1 functions as a cooling panel.

Next, a molding apparatus for such a hollow molded panel 1 will be described. As shown in FIG. 3, the molding apparatus 10 of the hollow forming panel 1 has an extruder 12 and a mold clamping device 14 arranged below the extruder 12, and is in a molten state extruded from the extruder 12. The resin sheet P is sent to the mold clamping device 14, and the molten resin sheet P is molded by the mold clamping device 14.

The extruder 12 is a conventionally known type, and although detailed description thereof will be omitted, the cylinder 18 to which the hopper 16 is attached, the screw provided in the cylinder 18 (not shown), and the screw are connected to the screw. It has a hydraulic motor 20, an accumulator 22 in which the cylinder 18 and the inside communicate with each other, and a plunger 24 provided in the accumulator 22, and resin pellets charged from the hopper 16 are screwed by the hydraulic motor 20 in the cylinder 18. The molten resin is melted and kneaded by the rotation of the hydraulic pressure, and the molten resin is transferred to the accumulator chamber 22 and stored in a certain amount. The continuous resin sheet P is extruded and is fed downward while being pinched by a pair of rollers 30 arranged at intervals, and is hung between the split molds 32. As a result, the resin sheet P is arranged between the split dies 32 in a state where the resin sheet P has a uniform thickness in the vertical direction (extrusion direction).

Like the extruder 12, the mold clamping device 14 is also a conventionally known type, and although detailed description thereof will be omitted, the two divided molds 32A and B and the molds 32A and B are made of a molten resin. It has a mold driving device that moves between an open position and a closed position in a direction substantially orthogonal to the supply direction of the sheet P.

The two split molds 32A and B are provided with recesses 119A and 119B having a shape complementary to the meandering recess so as to form a meandering recess forming a part of the flow path in the resin sheets P1 and P2. ing.

In each of the two split molds 32A and B, a pinch-off portion 118 is formed around the cavity, and the pinch-off portion 118 is formed in an annular shape around the cavity and faces the opposite molds 32A and B. Protruding. As a result, when the two split molds 32A and B are molded, the tips of the pinch-off portions 118 are in contact with each other, and the two molten resin sheets P1 and P2 have a parting line on the peripheral edge thereof. It is welded so that PL is formed.

The mold 33A is slidably fitted to the outer peripheral portion of the mold 32A in a sealed state, and the mold 33A is relatively movable with respect to the mold 32A by a mold moving device (not shown). .. The mold 33A can come into contact with the side surface of the resin sheet P1 arranged between the molds 32A and B by projecting toward the mold 32B with respect to the mold 32A. Although not shown, similarly, a mold is provided on the outer peripheral portion of the mold 32B, and the mold is arranged between the molds 32A and B by projecting toward the mold 32A. It is possible to contact the side surface of the resin sheet P2.

A vacuum suction chamber is provided inside the split molds 32A and 32B, and the vacuum suction chamber communicates with the cavity through the suction hole and is sucked from the vacuum suction chamber through the suction hole toward the cavity. The resin sheets P1 and P2 are attracted to form the cavity shapes of the split dies 32A and 32B.

At the time of molding, first, a predetermined amount of melt-kneaded resin is stored in the accumulator 22, and the stored thermoplastic resin is intermittently stored in a predetermined amount per unit time from the extrusion slits 34 provided at the T-die 28 at predetermined intervals. Push out. Next, the resin sheets P1 and P2 having a uniform thickness in the extrusion direction are arranged between the split dies 32A and B arranged below the pair of rollers 30.

Next, the resin sheets P1 and P2 are pressed into the cavities of the molds 32A and 32B by sucking from the vacuum suction chambers provided in the molds 32A and 32B through the suction holes, and the resin sheets P1 and P2 are pressed into the cavity shape. To shape. Then, while sucking and holding the resin sheets P1 and P2, the molds 32A and B are moved toward each other until the annular pinch-off portions 118A and B come into contact with each other, and the molds are clamped.

As described above, the hollow molded panel 1 to be molded is configured by welding two resin sheets (first resin sheet 2 and second resin sheet 3), and these first resin sheet 2 and second resin sheet 2 are formed. The resin sheet 3 contains a styrene-based elastomer as a component in order to ensure flexibility.

Examples of the styrene-based elastomer include a block copolymer having a soft segment made of a diene block (diene polymer part) and a hard segment made of a styrene block (styrene polymer part), polystyrene or the like, and specific examples thereof. For example, styrene-butadiene block copolymer (SB), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene block copolymer (SI) and styrene-isoprene-styrene block copolymer (SIS) or Examples thereof include hydrogenated additives of these block polymers. Further, high impact polystyrene, ABS resin (acrylonitrile-butadiene-styrene copolymer) and the like can be used.

The above-mentioned hydrogen additive is a block polymer in which all of the styrene block and the diene block are hydrogenated, or a block polymer in which only the diene block is hydrogenated, or a part of the styrene block and the diene block is hydrogen. It may be a partially hydrogenated additive such as an added block copolymer. Specifically, for example, (hydrogenated) styrene-ethylene-butylene-styrene block copolymer (SEBS), (hydrogenated) styrene-ethylene-propylene-styrene block copolymer (SEPS), (hydrogenated) styrene. -Ethethylene-ethylene-propylene-styrene block copolymer (SEEPS), (hydrogenated) styrene-butadiene block copolymer (SEB), (hydrogenated) styrene-ethylene-propylene block copolymer (SEP), etc. Be done.

Of these, (hydrogenated) styrene-ethylene-butylene-styrene block copolymer (SEBS) is the most suitable.

In the molding of the resin sheet containing the elastomer, in the above-mentioned molding, it is necessary to keep the resin sheet temperature at 90 ° C. or higher and 110 ° C. or lower by contacting with the mold 33A, shaping the cavity shape, and molding. .. If the temperature is less than 90 ° C., the welding strength between the resin sheets decreases, and if the temperature exceeds 110 ° C., it causes uneven wall thickness when shaping into a cavity shape.

However, if the first resin sheet 2 and the second resin sheet 3 of the hollow molded panel 1 are formed only of the styrene-based elastomer, the flow path 5 is crushed when the hollow molded panel 1 is curved, and sufficient distribution is realized. It is difficult to do so, and there is a risk of spoiling the appearance of the product, such as stickiness during molding and so-called sharkskin being recognized on the surface of the molded hollow molded panel.

Therefore, in the present embodiment, polypropylene is blended in an appropriate amount in addition to the styrene-based elastomer to eliminate these inconveniences. As an appropriate formulation, the content of the styrene-based elastomer is 65% by mass to 80% by mass, and the content of the polyolefin is 20% by mass to 35% by mass. More preferably, the content of the polyolefin is 30% by mass to 35% by mass.

If the content of the styrene-based elastomer is less than 65% by mass and the content of the polyolefin exceeds 35% by mass, sufficient flexibility may not be obtained. On the contrary, when the content of the styrene-based elastomer exceeds 80% by mass and the content of the polyolefin is less than 20% by mass, the flow path 5 is crushed when the hollow molded panel 1 is curved, and the flow path is secured. It can be difficult to do. In addition, stickiness may occur during molding, or so-called sharkskin may be observed on the surface of the molded hollow molded panel, which may impair the appearance of the product.

The hollow molded panel 1 to which the present invention is applied uses a resin sheet formed of a resin material in which a styrene-based elastomer and a polyolefin are mixed in an appropriate ratio, so that the hollow molded panel 1 has good flexibility and is bent. It is possible to secure a flow path reliably even at the time, and to realize a hollow molded panel having an excellent appearance. For example, the hollow molded panel 1 to which the present invention is applied can be bent as a whole, and the flow path is not closed in the bent state. Here, bending as a whole means, for example, not folding at a bending line, but bending in a columnar shape so that both ends abut against each other, twisting to the extent that the ends do not bend, and arbitrarily along with a human body or various articles. It refers to flexibly deforming the entire hollow molded panel, such as deforming it into a shape.

Hereinafter, specific examples of the present invention will be described based on experimental results.

Preparation of Hollow Molded Panel The contents of styrene-based elastomer and polypropylene contained in the resin sheet were changed as shown in Table 1, and this was molded to prepare a hollow molded panel (Examples 1 to 3 and Comparative Examples 1 to 3). ). The styrene-based elastomer used is manufactured by Asahi Kasei Corporation and has a trade name of H1221. Polypropylene is manufactured by Prime Polymer Co., Ltd. and has a trade name of B242WC.

Evaluation The manufactured hollow molded panel was evaluated by measuring its appearance, stickiness, welding strength, adhesive strength, and tensile elastic modulus (normal temperature). The results are shown in Table 1.
-Appearance A molded product with sharkskin confirmed was marked with x.
・ Put two sticky test pieces on top of each other and fix one of the test pieces. The other test piece was pulled with a push-pull gauge, and the force at the time of peeling was measured.
10N or more: Sticky and less than 10N: Non-sticky / welding strength The pinch-off part of the molded product is cut out in the examples and comparative examples, and the universal testing machine (AGS-10KNJ manufactured by Shimadzu Corporation, load cell 10kN) is pulled off at 10 mm / min. Measure the strength of the product.
・ Adhesive strength After fixing the PVC tube and the product connecting part with an ultraviolet curable adhesive, the product part and the PVC tube are fixed at room temperature using a universal testing machine (AGS-10KNJ, load cell 10kN, manufactured by Shimadzu Corporation). The strength at the time of tensile peeling is measured at 10 mm / min.
-Tension modulus (normal temperature) JIS K 7127
If it is 20 MPa or less, the flexibility is high.

As is clear from Table 1, in Examples 1 to 3 in which the contents of the styrene-based elastomer and polypropylene were appropriate, good results were obtained in each evaluation item. On the other hand, in Comparative Examples 1 and 2 in which the content of the styrene-based elastomer is high, stickiness occurs, and the welding strength and the adhesive strength are insufficient. Further, in Comparative Example 3 in which the content of the styrene-based elastomer is low, it can be seen that the tensile elastic modulus (normal temperature) is high and the flexibility is insufficient.

1 Hollow molded panel 2 1st resin sheet 3 2nd resin sheet 2a, 3a Flow path 4 Flow path 5a, 5b Overhanging cylinder

Claims (3)

The first resin sheet and the second resin sheet are partially welded,
A flow path is provided between the first resin sheet and the second resin sheet in a meandering manner.
Hot water or cold water is circulated in the flow path, and hot water or cold water is circulated.
A hollow molded panel that has the flexibility to deform into an arbitrary shape along the human body and various articles.
The first resin sheet and the second resin sheet contain a styrene-based elastomer and a polyolefin, and the first resin sheet and the second resin sheet contain a styrene-based elastomer and a polyolefin .
A hollow molded panel having a styrene-based elastomer content of 65% by mass to 70% by mass and a polyolefin content of 30% by mass to 35% by mass . The hollow molded panel according to claim 1, wherein the tensile elastic modulus is 17 to 20 MPa. The hollow molded panel according to claim 2, wherein the flow path communicates with a protruding cylinder protruding from the side surface of the hollow molded panel.

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