JPH0226650Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin foam, particularly an apparatus for producing a foam of a predetermined shape by stretch-molding a raw material discharged in liquid or cream form.

For example, polyurethane foam, polyisocyanurate foam, phenol foam (hereinafter referred to as
When using a material such as foam (simply referred to as foam) as a core material of a composite material, it is best to discharge the foam raw material (hereinafter simply referred to as raw material) in liquid form between the face materials, spread it widely, and form it. It's normal. As an apparatus for manufacturing this kind of member, for example,
There are No. 162164 and Japanese Utility Model Application Publication No. 163373/1983.
However, in the configuration of this type of apparatus, since the material is spread by rollers of the same length during reaction and foaming, the raw material cannot be spread uniformly to both ends, the center, and the front. ○B Easily affected directly by the dispersion pattern. ○There were drawbacks such as a high rate of entrainment of excess gas and air from the foaming agent in the center when it was being spread. As a result, the foam produced using the above-mentioned apparatus has blisters (gas pockets) on the surface of the two-face material, air voids, open cell structure, and streaks due to forced expansion, and has poor dimensional stability (shrinkage, expansion, etc.). ), mechanical strength (bending, compression), adhesive strength, etc. were severely impaired. Note that streaks occur because the surface of the raw material (the surface that comes into contact with the outside air) during foaming forms a skin layer, but the interior of the raw material reacts and foams, pushing the surface layer up into unevenness in response to the reaction, and the inner raw material forms a skin layer. It is thought that this occurs because the skin layers wrap around each other from the destroyed part.

In order to eliminate these drawbacks, the present invention is designed to release the raw material sequentially from the center of the mold member toward both ends before supplying the raw material discharged onto the base material or sheet-like material to the mold inlet. A device that spreads the material over a flexible sheet-like material has no streaks, has adhesive properties, and has high mechanical strength.
Furthermore, the present invention proposes a manufacturing apparatus that produces a uniform foam structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a synthetic resin foam manufacturing apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of a typical example of the above-mentioned device, and 1 and 2 are an upper mold member and a lower mold member made of metal (stainless steel, mild steel), rubber, etc., and are formed into a belt-like or caterpillar-type endless mold. The belts are formed into belts, which are wound around pulleys 3, 4, 5, and 6 and arranged one above the other so that they face each other at a predetermined interval H. For example, the pulleys 4 and 6 are connected to a motor (not shown) so that the mold members 1 and 2 are driven in the same direction. 7 is a space formed by the upper and lower mold members 1 and 2 facing each other, as shown in FIGS. It becomes a cross section. In addition, the second
In FIG. d, a base material (indicated by a dashed line), which will be described later, functions as a lower mold member. Reference numeral 8 denotes a synthetic resin foam raw material feeder (hereinafter simply referred to as a feeder), which has a nozzle, such as the one shown in Japanese Utility Model Application Publication No. 55-99762, and is disposed at the front end of the lower mold member 2. In other words, the feeder 8 is installed in front of the mold 7. 9
1 is a device for supplying a flexible sheet-like material 10. 11
is a device that feeds the base material 12 to the lower mold member 2.
Note that the sheet-like material 10 may be one of kraft paper, asbestos paper, asphalt felt, and metal foil.
These include seeds, laminates of two or more kinds, or waterproofed materials. Further, the base material 12 may be a thin metal plate, a gypsum board, a sheathing board, a slate board, a wood wool cement board, a plywood board, or the like. 13 is a spreading device with multiple rollers R ₁ ,
R ₂ ...R _o (R ₁ , R ₂ , R ₃ in the figure) is transferred to the feeder 8 and mold 7.
It is installed so as to cross the lower mold member 2 in order to guide the sheet-like material 10 up to the entrance 7a and to press and roll the raw material P discharged onto the base material 12. To explain further, as extracted and shown in FIGS. 3a and 3b, the required spreading width is Wo, and the rollers R ₁ , R ₂ , R ₃ are arranged in order from the feeder 8 toward the mold entrance 7a.
…When R _o (up to R ₃ in the figure) is given, its length is
W ₁ , W ₂ , W ₃ ...Wn (up to W ₃ in the figure), the pitch between the rollers is ₁ , ₂ ... _o (up to ₂ in the figure) from the lower die member 2 to each roller R ₁ , R ₂ , R ₃ ... R _o (R ₃ in the diagram)
(up to _{h 3 in the figure), then W 0 > W 1 ≒ 0.5W 0 >} W ₂ ≒
0.7W ₀ ＞W ₃ ≒0.9W ₀ …＞W _o ≒W ₀ , the final thickness of the product (shown in Figure 4) is h ₀ (form 14
h ₁ ≒0.5h ₀ ＞h ₂ ≒0.6h ₀ ＞
Arrange as h ₃ ≒0.8h ₀ . That is, raw material P
A trajectory that widens toward the mold inlet 7a from the discharge portion is performed simultaneously in two directions, horizontal and vertical. As a result, the discharged raw material is transferred from the center of the adherend surface (base material 12) toward both ends, including excess foaming agent and
Air is released, the raw materials react, and the foam fills the voids and is fed into the mold. Especially Laura
R ₁ is L≒W ₁ or L+10, where L is the width on the adhering surface of the raw material P discharged from the feeder 8.
Form to ~100=W ₁ . In addition, the reaction system of the raw material P,
For example, if polyurethane resin is used, the first
In the figure, the range A is from mixing time to cream time, the range B is from cream time to early gel time, or the end of gel time, and the range C is from end gel time to rise time, and curing time.

Next, a specific example will be explained.

First, as the upper mold member 1, a steel belt (width
1000 mm), the lower mold member 2 is a concave cross-section caterpillar with W ₀ = 910 mm, H = 25 mm, the upper and lower mold members 1,
2 rotates in the direction of the arrow at a speed of 20 m/min, and the mold temperature is set at 60°C. The raw material P is obtained by mixing the various components of a polyurethane resin by a one-shot method, and then discharging the mixture in a pattern with a cross section shown in FIG. 5a, for example, L=300 mm. The sheet material 10 is kraft paper, the base material 12 is a 9 mm sheathing board, W ₀ = 900 mm, and the diameters d ₁ to d ₂ of the rollers R ₁ to R ₃ are
100mmφ, h ₀ = 13mm, h ₁ = 15mm, h ₃ = 17mm, W ₁ =
It was set as 500mm, W ₂ = 700mm, and W ₃ = 900mm. As the supply device 9 and the feed device 11, a lifter and an uncoiler were used. Therefore, it is assumed that a composite panel shown in FIG. 4 is manufactured using this type of equipment member. Now, the base material 12 is conveyed in the direction of the arrow and is continuously fed so as to fit into the recess of the lower mold member 2, and this base material 12 passes under the feeder 8 and enters the mold entrance 7a. When moving in the direction, the raw material P is discharged onto the base material 12 with a width and a cross section as shown in FIG. 5a. On the other hand, the sheet-like material 10 is fed through a roller _R1 which also serves as a guide roller so as to face the concave portion of the lower mold member 2, and is mixed and discharged as a mixture or a raw material P in the cream time period. 5b, and the raw material P is spread by a doctor to both ends (in the direction of the arrow) of the base material 12 and to the front in FIG. 3a. Furthermore, when the base material 12 approaches the mold entrance 7a,
As shown in Figure d, the raw material P is sequentially spread forward from both ends and reaches the mold inlet 7a, where it is fed into the mold 7, where it undergoes final foaming and is further cured. The composite plate shown in FIG. 4 is then fed from the mold outlet.

When observing the composite board manufactured in this way,
It reacts and foams in a short time while being discharged in a small width of 1/2 to 1/5 of the width of the adhered surface, and the viscosity, adhesive strength,
Because the raw material whose volume increases rapidly is smoothly spread from the center to both ends (width direction), the sheet-like material 1
0 and the raw material P did not stay in the area where they first came into contact. Since the raw material of uniform thickness was sequentially spread by the rollers at each stage of the spreading device without creating gaps between the face materials, the foam had a uniform foam structure as a whole. Since air and excess foaming agent (gas) are spread from the center toward both ends while escaping into the outside air, no air voids or bulges are formed. The surface of the sheet-like material 10 was smooth and beautiful.

What has been described above is only one embodiment of the present invention.
It is also possible to arrange the rollers R ₁ , R _{2 . .} . R _o as shown in FIG. Further, the outer shapes of the rollers R _{1 .} . . R _o can also be formed as shown in FIGS. 7a to 7c. In particular, if the end of the roller is formed into an inclined or curved surface, the spreading will be smoother. Of course, the number of roller stages may be multiple depending on the foam thickness and width. Furthermore, polyisocyanurate foam, phenol foam, etc. have almost the same reaction system and can be handled in the same manner as described above. Further, the support of the rollers R ₁ to _{R o} is not limited to fixed support, but may also be supported by a float type. In addition, as shown in FIG.
Alternatively, the sheet material 10 may be supplied to the back side of the mold, the sheet material 10 may be reversed via the guide 15, and then spread by the spreading device 13 and fed to the mold entrance 7a. Of course, the pitch between the rollers R ₁ to _{R o} can be varied depending on the reaction system of the raw materials.

As described above, the apparatus according to the present invention has the feature that it is possible to produce a composite plate with the physical properties and appearance of - by eliminating the drawbacks of the conventional apparatus. Furthermore, the device according to the present invention has the feature that a conventional device can be easily improved at a low cost.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the synthetic resin foam manufacturing apparatus according to the present invention, Figs. 2 a to d are longitudinal sectional views showing an example of the cross section of the mold, and Figs. An explanatory diagram showing a spreading device which is a main part of the device according to the invention, FIG. 4 is an explanatory diagram showing an example of a composite plate manufactured by the device according to the invention, and FIGS. 5 a to d show the functions of the spreading device 13. Explanatory diagrams showing, Fig. 6, Fig. 7a
-c and FIG. 8 are explanatory diagrams showing other embodiments of the spreading device, the rollers, and the discharge position of the synthetic resin raw material. DESCRIPTION OF SYMBOLS 1... Upper die member, 2... Lower die member, 10... Sheet-like object, 13... Spreading device, 14... Foam.

Claims (1)

[Scope of utility model registration request] An endless lower mold member, an upper mold member that sequentially faces the lower mold member at a predetermined interval to form a mold, a synthetic resin foam raw material feeder installed in front of the mold, and a flexible sheet. comprising a sheet-like material feeder and a base material feeder, and between the raw material feeder and the mold inlet, and between the sheet-like material and the raw material on the base material supplied onto the lower mold member. In a synthetic resin foam manufacturing apparatus having a spreading device disposed above the sheet-like material so as to cross the mold member, a plurality of rollers are spread out from the raw material feeder toward the mold entrance;
An apparatus for producing a synthetic resin foam, characterized in that a spreading device is disposed so that the distance between the sheet-like material and the lower die member gradually increases.