JPH0473701B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a rod or plate-shaped body mainly made of foamed resin, and more specifically, to a method of manufacturing a rod or plate-shaped body mainly made of foamed resin. The present invention relates to a method for efficiently manufacturing a foamed resin body that can be retained.

[Conventional technology] Building blocks have traditionally been widely used as educational toys, but most of the materials are wood, plastic,
Foam, etc.

[Problems to be solved by the invention] However, since these building blocks made of hard materials can only take a certain shape, there are problems such as children getting bored with them and the period of time they can be used is short due to the development of intelligence. .

Furthermore, building blocks made of hard materials such as wood or plastic pose a risk of injury to young children if they are thrown or bumped into. On the other hand, those made of flexible materials such as foams have the disadvantage that although they deform to some extent, they cannot maintain their shape satisfactorily.

To solve these problems, and to create a more advanced material that can be bent, twisted, etc., a core material was placed inside a rod-shaped foamed resin body, or a foamed resin rod with a core material was considered. It was difficult to pass the core material through the rod, and productivity was low.

Therefore, an object of the present invention is to easily and efficiently produce a foamed resin body containing a core material, which can be widely used not only as an educational material but also as a household product.

[Means for solving the problems] The object of the present invention described above is achieved by the following configuration. That is, two closed-cell foamed resin bodies are sandwiched between a flexible linear core material that can substantially maintain its bent shape when bent, and the linear core material is wrapped. This method of manufacturing a foamed resin rod or board with a core material is characterized in that the two resin bodies are also bonded or heat-sealed.

The foamed resin body in the present invention is mainly a band-shaped or columnar body, and does not necessarily have to be flat, and may have protrusions on the surface. Examples of the material include polyolefin foam,
Examples include vinyl chloride foam and vinyl acetate foam, and among them, polyolefin foams such as polyethylene and polypropylene are preferred. Further, if the foamed resin is not closed-celled, it will not have sufficient strength, and it must be closed-celled in order to have appropriate resilience, feel, and shape retention.

Further, it is preferable from the viewpoint of flexibility that the density of the foamed resin is 0.03 to 0.2 g/cm ³ .

Furthermore, it is preferable that the two foamed resin bodies have different colors, since a more fashionable product can be obtained.

Further, the core material that can substantially maintain its bent shape when bent may be a linear material, and is not particularly limited, but includes, for example, a flexible metal wire. Specific examples include iron, copper, ammonium, duralumin, etc. It is preferable that these metal wires are coated with plastic, fiber, etc. to prevent rust and improve bendability. Specific examples of this coating material include vinyl chloride, polyethylene, and polyvinyl alcohol.

In addition, synthetic rubber, synthetic resin rods, etc. can also be used as the core material.

By enclosing the linear core material, it becomes possible to efficiently and continuously manufacture a foamed resin rod or plate in which the core material is located inside the resin.

The core material is used by sandwiching a plurality of core materials with at least one end fixed at the same distance between two foamed resin bodies, but in addition, at least one of the foamed resin bodies has a shape or shape that matches the core material. If you make a groove of the same size in advance, you can sandwich multiple pieces of core material together.
It is also preferable in terms of productivity. In the latter case, the core material does not necessarily need to be fixed at both ends, and can be mechanically aligned over the groove.

Thereafter, the two foamed resin bodies are adhered or heat-sealed.

Examples of the adhesive used in this case include chloroprene-based, acrylic-based, and polyester-based resins, and the coating amount is preferably about 50 to 200 g/ ^m2 , and the bonding method is by applying with a roll coater, It can be applied by spray.

Further, depending on the shape of the foamed resin body and the shape of the intended foamed resin rod or plate, further cutting, polishing, cutting, etc. are performed.

In this case, cutting is performed using a straight cutting machine, a hydraulic Thomson machine, etc., and polishing and cutting can be performed using, for example, a device generally called a router, which is an improved version of a potter's wheel. Depending on the shape of the foamed resin body and the desired foamed resin body with core material,
Cutting, polishing, and cutting may be performed in an appropriate combination.
Cutting and polishing are mainly done to adjust the size and shape. Furthermore, cutting such as grooves on the surface increases the flexibility of the resulting product, and when used as a cold insulation sheet, for example, it bends to fit the shape of the object to be kept cold, further improving the cold insulation effect.

In the resin body obtained by the method of the present invention, if both ends of the rod or plate-shaped body are sealed with the same or different material as the foamed resin sheet, safety is ensured, the product is made more durable, and the product value is increased. is preferable in that it improves.

Next, the present invention will be explained using the drawings.

FIG. 1 is a cross-sectional view of the main parts of an example of an apparatus for carrying out the method according to the present invention. FIG. 2 is a perspective view of a resin rod obtained by the method of the present invention, and FIG. 3 is a perspective view showing an example of a resin plate. FIGS. 4 to 8 are examples of cross-sectional views of other products. FIG. 9 and FIG. 10 are perspective views showing an example in which the rod-shaped body has different cross sections in its longitudinal direction. As for the resin plate, those having the above-mentioned cross section modified may also be mentioned.

In FIG. 1, a core material 2 is sandwiched between foamed resin bodies 1a and 1b, and after being heat-sealed by a heat source 3,
It is cut into a predetermined width by a slit 5, and further cut into a predetermined length by a cutting machine 6.

[Example] Next, the present invention will be further explained with examples.

Example 1 A specific gravity of 0.033g/
Made of cm ³ polyethylene foam 10 mm thick, wide
A galvanized iron wire (JIS G3532) with a wire diameter of 2.0 mm is sandwiched between 1000 mm sheets, and then heat-sealed to cover it, cut into 10 cm width and 15 cm length, and foamed resin with core material. Manufactured a stick. However, at this time, the sheet and iron wire were fed at a speed of 10 m/min, and hot air was sent from a 500°C heat source to perform thermal fusion.

According to the method of the present invention, the core material did not bend or warp, and the foamed resin rod containing the core material could be manufactured stably and with high productivity.

[Effects of the Invention] According to the method of the present invention, a foamed resin rod or plate containing a core material that can maintain its shape when bent can be easily and efficiently manufactured.

Furthermore, the obtained resin rod or plate can improve the intelligence of young children when used as an educational toy, and can be used by a wide range of age groups without getting tired of it.

In addition, when used as a hanger, it can be bent to suit the size and design of clothes, and can be widely used as curlers, accessories, and even cold insulation sheets.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of an example of an apparatus for carrying out the method according to the present invention. FIG. 2 is a perspective view of a resin rod obtained by the method of the present invention, and FIG. 3 is a perspective view showing an example of a resin plate. FIGS. 4 to 8 are examples of cross-sectional views of other products. FIG. 9 and FIG. 10 are perspective views showing examples in which the rod-shaped body has different cross sections in its longitudinal direction. 1a, 1b: foamed resin body, 2: core material, 3: heat source, 4: roller, 5: slit, 6: cutting machine.

Claims (1)

[Claims] 1 A flexible linear core material that can substantially maintain its bent shape when bent is sandwiched between two closed-cell foamed resin bodies, and the linear core material is wrapped. A method for manufacturing a foamed resin body containing a core material, characterized in that the two resin bodies are adhered or heat-sealed so as to do so.