JPS60244523A - Apparatus for molding undulating shaped sheet - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost of a roll having a complicated shape and to miniaturize the shape thereof, in processing a sheet so as to provide a continuous undulating shape thereto, by manufacturing the molding roll used in said processing by comining a large number of thin gear shaped discs. CONSTITUTION:Each of molding cylinder parts 11, 16 is formed of a combined body comprising disc shaped bodies 17 each having an opening 18 provided to the center thereof and a large number of teeth 19 provided to the outer periphery thereof at equal pitches. These disc shaped bodies 17 are inlaid with intermediate body parts 8A, 14A integrated with shafts 8, 14 byusing keys so that teeth 19 of adjacent disc shaped bodies 17 are positionally shifted to each other in the circumferential direction. A thermoplastic resin sheet 1 is passed between molding rolls 7, 13 comprising thus combined gear shaped molding cylinder parts 11, 16 to continuously obtain an undulating shaped sheet 20. Because these molding rolls 7, 13 can be manufactured by combining a large number of disc shaped bodiew 17, the manufacturing cost thereof becomes extremely inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION For industrial use, the present invention has a bulge 1- to both sides or one side of the reference surface.
The present invention relates to an apparatus for forming undulating sheets in which a large number of protrusions are regularly arranged and formed, and more particularly to an apparatus for forming tile sheets by continuously forming a flat thermoplastic sheet to obtain an undulating shape.

! Part 1 It is usually made of a thermoplastic resin material and has an undulating sheet in which a large number of protrusions bulging toward both sides or one side of a reference surface are regularly arranged and formed.

For example, civil engineering, construction ground water drainage bodies (undulating sheet type, etc.
It is used in a wide range of fields, including as a core material for panels for building interiors or heat insulation, and as packaging materials for articles with shock-absorbing functions.

Vacuum forming is a common method for obtaining undulating sheets. In vacuum forming, a resin sheet softened by heating is molded into a mold with air holes.

This is a method in which the resin sheet is brought into close contact with the mold by vacuum suction through the air holes, thereby giving the mold shape to the resin sheet.
It is especially suitable for forming thin sheets with surface precision. Typical of the products obtained by this method is a compact packaging material for packaging multiple eggs in one package (through-punch egg bag).
, medicine packaging material (G medicinal).

However, in the vacuum forming method, it is necessary to grasp the workpiece sheet at the periphery of the mold during molding, and therefore, when attempting to obtain a long molded product by moving the long sheet (E7) in a linear manner, The drawback is that the unshaped gripping parts appear at intervals, making it impossible to obtain a uniform long integrally molded product.In addition, the vacuum forming method is a batch method, which reduces productivity. There is a grudge against being inferior.

This problem is solved by continuous molding. A typical example of patterning is the roll method (embossing). In this method, one of the upper and lower forming rolls is a mold roll with an uneven shape, and the other is a flexible mold roll around the core. The undulating sheet 2 of a desired length can be obtained by winding the rubber into tile rolls, which are brought into contact with strong pressure and rotated in synchronous drive, and a heated resin jet is fed between both rolls.

However, the roll method for patterning is a molding method that gives the resin sheet a shape Z by pushing the shape-imparting protrusions on the outer periphery of the mold roll into the rubber layer of the opposing roll. The height of the protrusion formed in the resin sheet can be made only about twice the thickness of the resin sheet at most.

With other continuous molding methods, a large number of needle-shaped pieces are placed opposite each other in an endless conveying body such as a belt or chain, and the opposite needle-like pieces mesh with each other. There is a method in which the undulating sheet 2 is obtained by synchronously rotating and feeding a resin jet between both endless feeding bodies. According to this method, the height of one bulging protrusion and its arrangement density can be made sufficiently large. However, a molding device consisting of an endless feeding body with a large number of needle-shaped pieces has a very large number of two parts and is expensive to manufacture - and the device is large.

Problems to be Solved by the Invention The present invention was devised against this technical background, and its aim is to enable continuous molding of undulating sheets, improve productivity7, and improve the productivity of the sheet. Production! The goal is to make Mtw inexpensive.

Means and Effect for Solving the Problems The present invention is a forming apparatus for continuously processing a flat thermoplastic sheet to obtain an undulating sheet. A pair of forming rolls are provided, and both forming rolls are driven and rotated synchronously with each other in such a manner that one protrusion protrudes into the recessed part of the other without contact,
Both forming rolls have a forming body that includes a plurality of disc-shaped bodies having teeth at equal pitches on the outer periphery - or a plurality of disc-shaped bodies and a plurality of toothless discs. It is characterized by being formed into a shaped body.

According to the molding apparatus of the present invention, a flat thermoplastic resin sheet tl extruded from an extruder is directly guided between two molding rolls that rotate seven times, or it is wound into a coil shape to form a thermoplastic resin sheet (or rubber sheet). ) is continuously unwound and guided and passed between the unwound Geton-heated rear forming rolls.

During its passage, the thermoplastic sheet is forced by the protrusions of one forming roll into the recesses of the other forming roll, and a number of bulging protrusions are successively formed in a regular array.

il1 Hereinafter, Example Z of the present invention and drawings? Explain with reference.

FIG. 1 is a conceptual diagram showing the process of forming an undulating sheet. The thermoplastic sheet 1 is provided with a fill 2 and 5
After being continuously rewound by a roller pair 4, it is fed through a heating tank 3 to a forming device 6 by a roll pair 5. The thermoformable sheet 1 is then passed between the upper and lower forming rolls 7.13 in the forming device 6 to be given a predetermined shape, and sent out as an undulating sheet. The obtained undulating sheet 20 is sequentially cut into predetermined lengths using a well-known cutting machine.

Thermoplastic sheets are currently made of, for example, the following materials: That is, vinyl chloride resin (without a flammable agent).

Polypropylene resin, polyethylene resin, polystyrene resin, ethylene vinyl acetate copolymer resin, ABS resin
Polyester resin, ethylene propylene rubber (unvulcanized?
) % Boriete V Nbi mixture? L/7 polypropylene rubber (semi-vulcanized type), etc. The size of the thermoplastic sheet 1 can be selected as appropriate depending on the purpose of use of the undulating sheet mark. ”l
Use one with a width of 0.5 to 2.5 mm.

The shape of the undulating sheet is as shown in FIG. 2, and bulging-shaped protrusions n, 23 extending upward and downward perpendicular to the reference plane 21 are regularly arranged. It is formed. The upper and lower protrusions η, 23 are regularly arranged so that lines connecting the centers of the top surfaces of four protrusions located adjacent to each other define a square.

The protrusions 22 and 23 have a truncated quadrangular pyramid shape with a flat top. Its shape includes a square truncated pyramid shape with a flat top, and a truncated conical shape with a flat top so as to resist the compressive load acting on the undulating shape sheet 20 in the vertical direction with respect to the reference surface 21. The shape is preferably a truncated polygonal pyramid. FIGS. 3 to 6 VC&L show examples of shapes of undulating sheets as longitudinal sectional views along the width direction thereof. The regular example shown in FIGS. 5 and 6 has a protrusion only on one side of its reference plane F. In the figure, E indicates the edge of the undulating sheet.

In addition, the height h of the protrusion 2 of the undulating sheet: I23,
When the protrusion spacing is L, the ratio/L is 14 due to molding constraints.
It is selected in the range of 0 to 2, preferably in the range of 1/2 to 2. The selection range of the ratio h/I is the same even when the cross-sectional shape of the protrusion is different.

Next, the molding device 6 will be explained. In the molding device 6,
A pair of upper and lower forming rolls 7.13 are rotatably supported in a roll housing (not shown), and a driven gear 9, which meshes with a drive gear G connected to a drive source (not shown), is attached to the shaft 8 of the lower forming roll 7. The drive sprocket 10 is fixedly fitted, and the shaft 1 of the lower forming roll 13
A drive chain 12 is spanned between the driven sprocket 15 on the drive sprocket 4 and the drive sprocket IO.

Further, the molding body 11.16, which is supported by the intermediate body 8114A integral with the shaft 8.14, has a large number of protrusions and recesses between the protrusions in a regular arrangement on its outer periphery. (see Figure 7 above).

However, the molding body parts 11 and 16 are not integrally molded products, and as shown in FIG. 8, there is an opening L8 in the center.
It is formed as an assembly of disc-shaped bodies 17 (made of aluminum alloy material Guicast in Example 2) having a large number of teeth (i.e., protrusions) 19 at equal pitches on the outer periphery. The disk-shaped body 17 is mounted on the intermediate body 8A, IJA, which is integral with the shaft 8.14, in such a way that the teeth [9 of the adjacent disk-shaped bodies 17 are mutually displaced in the circumferential direction. It is fitted. The upper and lower forming rolls 7.13 have their protrusions (i.e. teeth)
[9] are synchronously driven and rotated facing each other so as to be correctly positioned in the center between the protrusions (concave portions) of the mating rolls without contact (see Fig. 9).

Further, the shafts 8 and I4 are hollow bodies, and the cooling water W is supplied inside the shafts, so that the molding bodies 11, 16 & 2, which are made of aluminum alloy and have good heat conduction, are effectively cooled.

The apparatus of this embodiment is constructed as described above, and the thermoplastic sheet is heated in the heating tank (e.g., infrared heating) 3 until it becomes moderately soft (heating of about 100 to 1,500 degrees Celsius) as described above. When the sheet 1 passes between the upper and lower forming rolls 7 and 13 of the forming device 6, which rotate synchronously, percussion deformation is performed, and an undulating sheet mark with bulging protrusions 22 and η is continuously obtained. It will be done.

At this time, since the molding body 11, I6 is cooled by the water supplied to the shaft 8.14, the temperature of the obtained undulating shape sheet 20 has been sufficiently decreased, and the protrusion shape is It never changes.

By the way, the shape of the undulating sheet, that is, the protrusions 22, 2
317) iS A, RLO ratio between projections (/j) & X, thermoplastic sea) IY Considering the deformation characteristics of the material forming the shadow17
Depending on the use of the product, the diameter of the tip of the disk 17, the tooth [
9 (or the shape of the concave portion), size, and interdental pitch.
In this case, there is a risk of breakage during molding, especially in the case of a thin heat-retrograde sheet.

Furthermore, if the diameter of the disc-shaped body 17 is too small, the depth of mutual engagement between the upper and lower forming rolls 7 and 13 cannot be increased, and therefore the undulating sheet can be processed. It becomes difficult to enlarge the protrusion 22 and height 7 of Otsu. From this point of view, it is preferable that the tip circle diameter of the disk-shaped body F be 30 mm or more.

Furthermore, if the upper and lower forming rolls 7.13 of this embodiment are manufactured as one piece, the manufacturing cost will be extremely high due to the complicated shape; For example, the production cost is low, and the structure is simpler than that of conventionally known continuous molding devices, and the size can be significantly reduced.

In addition, when adding undulating sheets, the protrusions 22 are arranged in a square arrangement [7], but if they are arranged in a triangular arrangement, the arrangement becomes 7.
When the undulating sheet 20 is placed along a curved surface, there is an advantage that the top surface of the protrusion easily conforms to the curved surface.

Incidentally, in order to form the undulating sheet having the cross-sectional shape shown in FIG. 5, the forming roll (2), 337 having the shape shown in FIGS. 10 to 12 may be used. However, forming roll 3
0&! , a knee type disk-shaped body 3j, 32, and a forming roll 31 & two types of disk-shaped bodies 34, 35.

Furthermore, in the front part of the molding device 6 (where the thermoplastic sheet l enters (11!I) A laminating machine that laminates one sheet with another sheet can be arranged, and a protrusion 22 at the rear position of the forming device 6, an endless cutter that cuts off the top of the swamp, or a resin sheet, a porous resin sheet, a non-woven fabric, a woven fabric. , plywood, etc., are not bonded by means such as heat fusion, adhesive bonding, etc., and various panels, civil engineering construction materials, DIY (DO work) etc.
You, r5elf (abbreviation for do-it-yourself) products, etc. can be equipped with various machines that can be obtained continuously, and have higher production efficiency than conventional equipment for constructing similar products. Can be manufactured at low cost.

The effects of the invention are clear from the description of the embodiments. In the present invention, a pair of forming rolls and a plurality of toothed circles are used to form a flat thermoplastic sheet χ to obtain an undulating shape. Formed by a plate-shaped body, or a plurality of toothed disc-shaped bodies and a plurality of toothless disc-shaped bodies, the manufacturing cost of the device is low, the device is miniaturized, and the undulating shape of the groove is formed. Manufacture 1- with high production efficiency and low cost.

[Brief explanation of the drawing]

FIG. 1 conceptually shows an undulating sheet manufacturing facility according to an embodiment of the present invention. FIG. Vertical cross-sectional views along the width direction - FIGS. 4 to 6 are cross-sectional views of other undulating sheets, FIG. 7 is a perspective view of essential parts of the forming roll according to the above embodiment, and FIG. 8 is a cross-sectional view of the forming roll. FIG. 9 is an enlarged view of the main part of FIG. 1, and FIGS. 10 to 12 are explanatory views of forming rolls according to other embodiments. be. DESCRIPTION OF SYMBOLS 1... Thermoplastic sheet, 2... Fill, 3...-Heating tank, 4.5... Roll pair, 6... Molding device, 7...
...Bottom forming roll, 8...shaft, 9 river driven gear, 1
o... Drive sprocket, 11... Body for forming, 12... Drive chain, 13... Lower forming roll + 14... Shaft, 15... Driven sprocket,
16... Body for molding, 17... Disc-shaped body, 18...
・Opening, [9...teeth (protrusion), mark...undulating shape sheet, 21...reference surface, 22, oh...protrusion. Agent Patent Attorney Nozomi Ehara 2 Atsushi 1 En Atsushi 2 Zu Atsushi 30 4th Prisoner 5th Figure 6th Garden Figure 7 and 9th Country 11th Prisoner 12th Cause Procedures Amended Book 1982 Mr. Manabu Shiga, Commissioner of the Japan Patent Office, 1, Indication of the case, Patent Application No. 101186, filed in 1982, 2, Title of the invention: Apparatus for forming undulating sheet 3, Relationship with the amended person case Patent applicant address: Tokyo 10-1, Kyobashi, Chuo-ku, Tokyo Name: Pridestone Co., Ltd. Representative Kunio Hattori 4, Agent Address: 1-1-17 Toranomon, Minato-ku, Tokyo (Toramon Umehara Building) Tu 03-501- 2621 names (6
784) Patent attorney Nozomi Ebara and two others 5. Date of amendment order: August 28, 1980 (shipment date) 6. Number of inventions increased by amendment: None 7. Power of attorney to be amended (statement of delegate) and Statement M 81 Correct Contents As shown in the attached sheet, the description in section 1 of the brief description of drawings in the specification, page 13, line 8, figure 1, figure 2 has been corrected to figure 3, figure 1.

Claims (1)

[Claims] On both sides of the reference surface, a large number of protrusions bulging toward one side are regularly arranged and formed in an undulating shape. consists of a pair of forming rolls with protrusions,
The image forming rolls each have one protrusion that protrudes into the other concave portion without contact L7. The image forming roll is synchronously driven and rotated in a m-shape, and its forming body has a plurality of disc-shaped bodies having teeth at equal pitches on the outer periphery, or a plurality of waist plate-shaped bodies and a plurality of disc-shaped bodies. A forming device that continuously processes a flat thermoplastic sheet to obtain an undulating sheet.