JPH08290463A - Method and apparatus for cooling panel-shaped blow molded product - Google Patents

Abstract

PURPOSE: To shorten the cooling time in a molding process and to obtain a panel-shaped blow molded product with high dimensional precision and without warpage and torsion. CONSTITUTION: In a cooling method for a panel-shaped blow molded product, a molded article 30 in a semi-solidified state in blow molding is taken out and, after flashes being removed, is placed on a partition panel 40 to be integrated, and the products are piled in sequence in a box type container 50 to be pressed downward, cooling water is passed through the cooling water piping 42 of the partition panel 40, cold air is injected into the molded article 30 through a blow pin, and the molded articles 30, after being cooled, are taken out in sequence from an outlet below the container 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling method and a cooling device for a panel-shaped blow-molded product, and shortens the cooling time after the blow-molding to obtain a product with high dimensional accuracy without warping or twisting. It is an intention.

[0002]

2. Description of the Related Art Conventionally, as a concrete pouring formwork, wood which has been processed and formed is used because it is inexpensive, but the surface of the formwork is used once or twice or at most three to four times. Most of the scratched molds (panels) were in a disposable state and were discarded by incineration. Such a usage example is a big problem in terms of resource protection and environmental problems in the present day when the depletion of wood resources is just around the corner. On the other hand, from the viewpoint of protecting such wood resources, a resin mold produced by an injection molding machine has started to be used as a substitute, is lightweight and easy to handle, and can withstand repeated use 4 to 5 times. There was also an advantage. However, the resin molds produced by the injection molding machine can withstand repeated use of 4 to 5 times or more, are lightweight and easy to handle, but once damaged severely, it is difficult to repair and it is necessary to replace each panel. At the same time, it has the drawback that the production cost is extremely high compared to wood panels. Therefore, recently, a resin mold has been produced easily and inexpensively by a blow molding machine and has begun to be used. The blow-molded resin mold has, for example, as shown in FIG. 5, a backup surface 20B behind a smooth casting surface 20A for placing concrete, in which convex portions and concave portions are arranged in a grid pattern, As shown in FIG. 6, the cross section thereof has a structure in which the backup surface 20B is bent in a substantially corrugated shape, and a hollow portion is formed inside to be lightweight and have rigidity against bending and compression.

[0003]

However, when such a panel-shaped blow molded product is manufactured by blow molding, blow molding generally makes contact only with the surface side of the parison and the inner surface of the parison contacts the mold. Never do
Moreover, since it is a low-pressure molding, it requires a long cooling time in the molding process after the mold is clamped, and most of the molding cycle is consumed in this cooling time (cooling and solidification time), which leads to poor productivity and thickness control. However, compared to the injection molding, the precision is poor and the dimensional stability for each shot is poor, and there is a problem that the product is easily warped or twisted. Because of this, blow molding, which should originally have low mold cost, low machine cost and low production cost, results in high cost due to low productivity, and the quality is inferior to that of injection molded products. It was a factor that molding did not spread.

[0004]

To solve the above problems, in the present invention, the method of the first invention is a method for cooling a panel-shaped blow-molded article molded by a blow molding machine, In the middle of blow molding, the molded product is taken out in a state where the surface is solidified and the inside is not solidified, the burrs around the molded product are removed, and then the molded product is partitioned in a box-shaped container that can be stacked in the vertical direction. A plurality of sheets are sequentially stacked while interposing a sheet, and a weight is stacked on the uppermost surface of the stacked molded articles or pressed downward by pressing means, and cooling water to a cooling water pipe provided on the partition panel After cooling the molded product by injecting cooling air into the molded product through water flow and a blow pin protruding from the partition panel, the cooled molded product is sequentially taken from the lowermost part. It was to configure. Further, in the apparatus of the second invention, the inner frame is formed to be slightly larger in size than the outer frame of the panel-shaped blow-molded product molded by the blow molding machine, and a discharge port for drawing the molded product horizontally is provided on the lower side surface. A box-shaped container provided, a plurality of partition panels that are interposed and stacked between each of the plurality of molded products that are stored in the box-shaped container in an overlapping manner, and vertically stacked on the box-shaped container. And a press means for pressing the uppermost surface of the molded product downward, wherein each partition panel has cooling water pipes through which cooling water flows. And a blow pin for injecting cooling air into the inside of the molded product immediately below the partition panel.

[0005]

In the present invention, the parison to be clamped by the blow molding machine is taken out in the semi-solidified state (the surface is solidified and the interior is not yet completely solidified) during the blow molding to remove the burrs around the parison. After removing, place multiple molded products in a box-shaped container horizontally with a partition panel in between, and place a weight to apply the required load to the molded product on the top surface, or use hydraulic or air pressure. While pressing lightly downward with a pressing means such as a cylinder, cold water is passed through the cooling water piping provided on the partition panel to cool the molded product from the surface, and at the same time, it is provided so as to project downward on the partition panel. Blow pins are used to inject cold air into the molded product panel to cool it. Then, after a lapse of a certain cooling time, by sequentially taking out the lower one from the box-shaped container, a panel-shaped blow-molded product which is the final product which has been completely solidified by cooling is completed. Thus, in the present invention,
The cooling time is shortened, the operation rate of the blow molding machine is increased, the productivity is improved, and a molded product of high quality with good dimensional accuracy without warping or twisting can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention,
1 is a perspective view of a cooling device for a panel-shaped blow molded product, FIG.
3 is a vertical cross-sectional view of the box-shaped container, FIG. 3 is a perspective view of the panel-shaped blow-molded product and the partition panel, and FIG. 4 is an enlarged vertical cross-sectional view of essential parts of the panel-shaped blow-molded product and the partition panel.

As shown in FIGS. 1 and 2, the box-shaped container 50 has a rectangular box-like shape with an inner frame size slightly larger than the outer frame size of the panel-shaped blow-molded product 30, and has four side walls 50.
a side wall 50a, which has a substantially inverted T-shaped opening, and the lower horizontal portion of the opening is a set of panels horizontally housed in the box-shaped container 50. Blow-molded product (hereinafter referred to as a molded product) 30 and a partition panel 40, which is superposed on and integrated with the blow-molded product 30 as shown in FIG. 3, are formed to have an area capable of being horizontally extracted. On the other hand, in the box-shaped container 50, as shown in FIG. 3, a plurality of partition panels 40, which are stacked and integrated with the molded product 30 facing downward, are housed so as to be sequentially superposed. A weight (pickle stone) having an appropriate weight is applied on the uppermost partition panel 40 to maintain the levelness by applying a load downward to prevent deformation such as warpage and twist during cooling and solidification. It is configured so that it can be pressed downward with an appropriate force using a pressing means (pressing press) 60 such as a hydraulic cylinder or a pneumatic cylinder that can be vertically moved up and down.

The partition panel 40 is formed to have substantially the same outer dimensions and thickness as the molded product 30, and a cooling water pipe is laid inside the partition panel 40. One side of the partition panel 40 has a cooling water pipe, as shown in FIGS. An (inlet side) 42a and a cooling water pipe (outlet side) 42b are provided in a protruding manner and serve as a cooling water supply pipe and a cooling water supply pipe by a water pipe such as a flexible pipe through quick couplings 46, 46 connected to the ends thereof. It is connected to the cooling water pipe 42. As shown in FIG. 4, a blow pin 48 is provided so as to project downward at a substantially central portion along the longitudinal direction of the partition panel 40, and a blow pin air pipe 44a connected to the blow pin 48 is provided inside the partition panel 40. To be done.

The operation of the cooling method of the cooling apparatus 100 for the panel-shaped blow-molded article 30 of the present invention constructed as above will be described. The parison discharged by a normal blow molding machine is clamped by sandwiching it between a pair of left and right molds, and the surface is solidified and the inside is not solidified yet before the parison is completely cooled and solidified in the mold. After removing the parison in the state and removing the burrs attached to the periphery of the molded product 30, as shown in FIG. 3, the partition panel 40 is superposed and integrated on the molded product 30 to form a box shape. Container 50
The product 30 is gently left in a horizontal state, and the molded products 30 sequentially taken out from the mold are subjected to the same operation and sequentially stacked on them. Then, a weight is loaded on the uppermost partition panel 40, or a light load is applied downward to the plurality of sets of molded products 30 by operating the pressing press 60. At the same time, while cooling water is passed through the cooling water pipe 42 of each partition panel 40,
Cold air is supplied to the blow pins 48 that penetrate the upper surface of the molded product 30. After the cooling time of about 3 to 5 minutes has passed as described above, the set of molded products (30 and 40) housed in the box-shaped container 50 is set one by one.
It is taken out by sliding it horizontally from the take-out port 52 formed in the lower side wall of No. 0. When taking out each of the molded product sets, it is desirable to temporarily stop the operation of the weight and the pressing press 60 to take them out in a free state. In addition, in the embodiment of the present invention shown in FIGS. 1 and 2, the panel-shaped blow-molded product 30 and the partition panel 40 are integrated with each other, and are horizontally arranged to be stacked in the box-shaped container 50. A method may be adopted in which the box-shaped container 50 of FIGS. 1 and 2 is rotated by 90 ° and arranged as if the books were placed in a bookcase.

In the present invention, as described above, the parison being molded is taken out early from the blow molding machine and forcedly cooled by using the cooling device 100 provided separately. Since the operating rate of the molding machine is increased, the productivity is improved, and the flatness is maintained by applying an appropriate load to prevent deformation (warping or twisting) during cooling. A quality panel blow molded product is obtained.

[0011]

As described above, according to the present invention,
The productivity is improved by shortening the cooling time in blow molding, and a high-quality panel-shaped blow-molded product with excellent flatness without warping or twisting is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a cooling device for a panel-shaped blow-molded product according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the box-shaped container according to the embodiment of the present invention (showing the view AA of FIG. 1).

FIG. 3 is a perspective view showing a combination state of a panel-shaped blow-molded product and a partition panel according to an embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional view of an essential part of a panel-shaped blow-molded product and a partition panel according to an embodiment of the present invention.

FIG. 5 is a perspective view of a conventional panel-shaped blow molded product (resin mold).

FIG. 6 is a cross-sectional side view of a conventional panel-shaped blow molded product (resin mold).

[Explanation of symbols]

 20 Resin Formwork 20A Placing Surface 20B Backup Surface 20C Side Surface 20a Through Hole 30 Panel Blow Molded Product 30a Blow Pin Hole 40 Partition Panel 42 Cooling Water Pipe 42a Cooling Water Pipe (Inlet Side) 42b Cooling Water Pipe (Outlet Side) 44 Blow Piping 44a Air piping for blow pin 46 Quick coupling (piping joint) 48 Blow pin 50 Box container 50a Side wall 50b Bottom plate 52 Outlet 60 Press means (extrusion press) 100 Cooling device

Claims (2)

[Claims] 1. A method for cooling a panel-shaped blow-molded product molded by a blow molding machine, wherein the molded product is taken out in a state where the surface is solidified and the inside is unsolidified during blow molding,
After removing burrs around the molded product, a plurality of the molded products can be stacked one on top of the other in a box-shaped container capable of accommodating them in the vertical direction with a partition panel interposed therebetween, and on the uppermost surface of the stacked molded products. A weight is loaded or pressed downward by a pressing means, and cooling water is supplied to the cooling water pipe provided on the partition panel and cooling air is blown to the molded product through a blow pin protruding from the partition panel. A method for cooling a panel-shaped blow-molded product, which comprises cooling the molded product by injecting the molded product, and then sequentially taking out the cooled molded product from the lowermost part. 2. A box-shaped container having an inner frame size slightly larger than an outer frame size of a panel-shaped blow-molded product molded by a blow molding machine, and having a discharge port on a lower side surface for drawing out the molded product horizontally. And a plurality of partition panels that are interposed and stacked between each of the plurality of molded articles that are stored in the box-shaped container in an overlapping manner, and are stored in the box-shaped container in a vertically overlapping manner. A weight to be loaded on the uppermost surface of the molded product or a press means for pressing the uppermost surface of the molded product downward, and each partition panel is provided with a cooling water pipe for passing cooling water therein and the partition wall. Cooling device for panel-shaped blow-molded products, which comprises blow pins for injecting cooling air into the molded products directly under the panel.