JPS62189139A - Manufacture of plastic sheet provided with thin down - Google Patents

Abstract

PURPOSE:To mass-produce sheets provided with thin down, whose length is long, at high density, by a method wherein a plastic sheet which is under-heat softened state is conveyed by making the same follow after a rotary opposing roll surface or separation roll surface and the same is exfoliated in order against suction and adhesion to a permeable and porous member surface of the sheet based no a sucking action of a suction roll. CONSTITUTION:A plastic sheet S is supplied to the outside of a suction roll round the external circumferential surface of which a permeable and porous member 2 such as woven cloth or a wire net is wound as it is under a high-temperature and softened state directly after extrusion. Then the sheet S which has passed through a nip part between the suction roll 1 and an opposing roll 3 is kept exfoliated in order from a permeable and porous member surface against suction and adhesion to the permeable and porous member surface of the sheet based on a sucking action of the suction roll, for example, the sheet S is made to convey by making the same follow after the rotary opposing roll 3 surface. With this constitution, a thick part Sa of the sheet S is kept extended gradually as a hairly protrusion or a needle-like protrusion as per Sa1-Sa4 by making a permeable and porous member side into a tip side and the tip part is separated completely from the permeable and porous member 2 surface side like an Sa5 in due course of time.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Field of Industrial Application] The present invention relates to a method for producing a fluffed plastic sheet (including films and plates).

[Conventional technology]

Sticky plastic sheets, that is, plastic sheets with many hair-like or needle-like protrusions formed on the surface, have a unique texture and texture.
For example, it is effective as a decorative skin material for various interior materials of automobiles, a decorative skin material for various architectural interior materials, and a base material for various miscellaneous goods, bags, etc.

Conventionally, such embossed plastic sheets have been produced using a metal engraving roll (emboss roll), which has a large number of four parts formed as densely as possible on the outer peripheral surface to form hair-like or needle-like protrusions. ), a heat-softened plastic sheet is introduced between the engraving roll and the counter pressure roll, and a number of hair-like or nail-like protrusions are embossed on the surface of the sheet (empossing). It is formed and manufactured by.

[Problem that the invention seeks to solve]

However, metal engraving rolls used as embossing rolls require costly casting equipment, metal working equipment, and other metal processing equipment to manufacture, have a long lead time for mold making, and are quite expensive.

In addition, when forming hair-like or needle-like protrusions by embossing, each of the four parts of the mixed mold on the side of the engraving roll is made deep and thin in order to make the hair of each crystal long and thin. Then, it becomes difficult to release the hair-like or needle-like protrusions that have entered into the recesses and been molded, or the mold release becomes unbalanced.

Therefore, the individual crystals that can be formed by embossing are limited to those that are relatively short and thick in length and diameter.

The present invention was developed and proposed in view of the above, and it is possible to inexpensively mass-produce this type of plastic sheet with long, thin crystals formed on the surface at a high density, without using expensive metal engraving rolls. The aim is to provide a unique method that can

Summary: Structure of the Invention [Means for Solving Problems] The present invention provides a structure in which an air permeable porous member is wound or suspended around a rotating intake roll whose outer peripheral surface is an intake surface, and the surface moves as the intake roll rotates. and is in the suction state due to the suction action of the suction roll.'' A plastic sheet in a thermally softened state is supplied to the surface of the permeable porous member, and is passed through the nip between the suction roll and a rotating roll facing the roll. , the plastic sheet that has passed through the nip is conveyed along the rotating opposing roll surface or along the separating roll surface provided next to the roll, whereby the plastic sheet is conveyed based on the suction action of the suction roll. The object of the present invention is to provide a method for producing a plastic sheet with adhesive, which is characterized in that the plastic sheet is sequentially peeled from the surface of a porous air-permeable member against the suction adhesion force to the surface of the air-permeable porous member.

[For production]

Specifically, for example, existing woven fabrics, non-woven fabrics, wire mesh, etc. can be used as the breathable porous member.

FIG. 1 is an explanatory diagram of the principle of crystal formation in the method of the present invention. 2 is an intake roll; 1a is a large number of intake holes formed in each part of the outer circumferential surface; 2 is an air permeable porous member wrapped or suspended around the outer circumferential surface of the intake roll; Intake roll 1
is rotated in the direction of the arrow at a predetermined circumferential speed, and as the roll rotates, the air permeable porous member 2 on its outer surface also moves in the same direction. When the suction roll 1 is brought into the suction state, each part of the outer surface of the permeable porous member 2 is brought into the state of sucking outside air. Reference numeral 3 denotes a rotating opposing roll to the suction roll l around which the permeable porous member 2 is wound or suspended, and a predetermined gap is provided between the roll parallel to the suction roll 1 and the outer surface of the permeable porous member 2. are arranged opposite to each other, and are rotationally driven in the direction of the arrow at a predetermined circumferential speed.

The surface of the plastic sheet S is moved as the suction roll l rotates, and the plastic sheet S, which is sufficiently thermally softened, is supplied to the surface of the permeable porous member 2, which is in a state of sucking outside air by the suction action of the suction roll. Here, for convenience, the surface of the sheet S facing the air permeable porous member 2 will be referred to as the front surface, and the surface on the opposite side will be referred to as the back surface.

The surface side of the supply sheet is brought into close contact with the outer surface of the permeable porous member 2 due to the external air suction force generated on the outer surface of the permeable porous member 2. It is sucked into the porous hole and enters the state.

In the case of FIG. 1, the breathable porous member 2 is a woven fabric or a wire mesh, and inside each weave or stitch of the material, the interior Sa of the surface layer of the sheet s is stretched into a tapered protrusion shape by the suction force of the suction roll l. The sheet S, which has been brought into close contact with the two surfaces of the air permeable porous member as described above, then presses the nip between the suction roll l and the rotating opposing roll 3. pass.

The plastic sheet S that has passed through the nip section is placed along the surface of the rotating opposing roll 3 (or along the surface of the separation roller 31 (FIG. 5(b)) disposed next to the roll 3).
41! By feeding the plastic sheet, the plastic sheet is sequentially peeled off from the surface of the permeable porous member against the suction adhesion force of the plastic sheet to the permeable porous member surface based on the suction action of the suction roll. Then, as the peeling occurs, it bites into each of the holes on the surface of the permeable porous member 2 on the surface side of the sheet 1-S and is attached to the inner surface of the sheet Sa in the surface layer, which is suctioned and adhered by the suction force of the suction roll 1. A tensile force in the opposite direction to the suction direction acts, and as the sheet S peels off, the sheet interior Sa becomes Sa1 to Sa with the permeable porous member side as the tip side.
As shown in a4, the protrusions gradually become elongated into hair-like protrusions or needle-like protrusions, and eventually the tips of the protrusions are completely separated from the second side of the air-permeable porous member as shown in S a5.

In this way, the individual inner sheets Sa of the sheet surface layer that are inserted into the respective porous holes on the outer surface of the air permeable porous member 2 are stretched as hair-like or gold-like protrusions S a 5, thereby increasing the density. In this process, plastic sheets are manufactured continuously.

The length and thickness of the hair-like or needle-like protrusions Sa5 formed as crystals are determined by the degree of softening or viscosity of the plastic sheet S in a thermally softened state introduced between the members 2 and 3. , the MI value (melting point) of the plastic material, the density, size, and depth of each porous hole on the outer surface of the permeable porous member 2, the external air suction force generated on the outer surface of the member, and the amount of the introduced plastic sheet S against the outer surface of the member. Various adjustments can be made depending on the adhesiveness, the peeling speed of the introduced plastic sheet from the outer surface of the member, etc., and products with long and thin bristles can be easily manufactured.

In addition, by using the breathable porous member 2 as a relatively thick woven fabric, knitted fabric, wire mesh, or other mesh member having textures, stitches, and punched holes of approximately 250 to 10,008 L per month according to JIS Z8801, a sheet can be formed in each opening. The interior Sa of the surface layer portion of S is stretched into a tapered protrusion shape by the suction force and sufficiently penetrates into the surface layer to form a planar state. Next, the sheet with 5 can also be obtained by passing the sheet through a cooling zone and solidifying it, and then peeling off the permeable porous member.

〔Example〕

In FIG. 2, S is a plastic sheet that is continuously extruded downward from an extrusion molding die 10 (the extruder main body is omitted in the figure) to a predetermined thickness φ width, and the next thickness adjustment roll pair 11, and is supplied to the outer surface of an intake roll 1, which has an air-permeable porous member 2 such as woven cloth or wire mesh wrapped around the outer peripheral surface thereof, substantially in a high-temperature softened state immediately after extrusion. Then, it is introduced between the intake roll 1 and the counter-rotating roll 3.

The intake roll 1 and the opposing roll 3 are rotationally driven in the direction of the arrow at the same circumferential speed as the supply speed of the sea) S, or the opposing roll 3 is rotated at a slightly higher circumferential speed than the intake roll 1 (the drive mechanism is shown in the figure). omission). Also, the intake roll l is in the intake state.

The sheet S that has been supplied to the air permeable porous member 2 surface of the intake roll 1 and then passed through the nip between the intake roll and the opposing roll 3 is conveyed along the outer circumferential surface of the opposing roll 3 to ventilate the outer circumferential surface of the intake roll. The material is sequentially peeled off from the two surfaces of the porous member. During this peeling process, numerous hair-like or needle-like protrusions Sa5 as crystals are formed on the surface of the sheet S, as explained in the section of the above-mentioned operation. Next, the sea 1-S passes through a cooling device zone 12 such as a cold air type or a cooling water spray type, and is wound up on a winding shaft 13.

Reference numeral 14 denotes a rotating cleaning brush brought into contact with the outer surface of the air permeable porous member 2, which scrapes off and removes the resin that has more or less adhered to and transferred from the sheet S side to the air permeable porous member 2 surface during the peeling process of the sheet S.

FIG. 3 is an enlarged cross-sectional view showing the internal structure of the intake roll 1;
FIG. 4 is a longitudinal developed view taken along line IV-IV in FIG. 3.

The intake roll 1 is a hollow drum-type roll having a large number of intake holes 1a formed on its outer peripheral surface, and is freely rotatable around an immovable pipe shaft 20 passing through the center of the roll. A permeable porous member 2 such as woven cloth or wire mesh is provided on the outer peripheral surface of the intake roll 1.
It is wrapped tightly and fixed without sagging.

21 (Fig. 4) is a boss formed in the center of one end plate 22 of the drum-type roll 1, which is an intake roll, and rotational force is transmitted to this post 21 from a rotational drive mechanism (not shown in the figure) to move the roll l. The bearing 24.2 is centered around the pipe shaft 2o.
4 at a predetermined constant speed.

Reference numerals 25 and 26 designate an air suction duct having a fan-shaped cross section and a cooling medium duct for water, cold air, etc. each having its base welded to and supported by the pipe shaft 20 in the drum type roll l.

The air suction duct 25 is connected to the left and right end plates 22 of the drum-type roll 1.
・It has approximately the same length dimension as the inner surface of the drum 22, and has numerous relatively large diameter holes 25b formed in the arcuate body surface 25a to bring the arcuate body surface 25a as close to the inner surface of the drum as possible. It is a gift. The inner space of the duct 25 and the pipe shaft 20 are communicated through a hole 20a formed along the length of the pipe shaft wall. Also, the pipe shaft 20 has a blind plate 20b on one end side.
The other end is connected to a vacuum pump P. 25c is the circle g11ji1 side 2 of the air suction duct 25
In order to improve the airtightness of the gap between 5a and the inner circumferential surface of the drum-shaped roll l and improve the vacuum suction efficiency, a constant elastic contact with the inner surface of the drum-shaped roll is attached along the outer circumferential edge of the arcuate body surface 25a of the duct 25. It is a low-friction puffkin strip (made of silicone rubber, etc.).

The cooling medium duct 26 has approximately the same length as the inner surface of the left and right end plates 22-22 of the drum-shaped roll l, as well as the air suction duct 25, and has a thermally conductive material on the arcuate body surface 26a. For example, stainless steel fiber nonwoven fabric with low scratch resistance 26
b, etc. are pasted together, and the surface of the nonwoven fabric 26b is brought into contact with the inner surface of the drum-shaped roll. Then, a cooling medium such as water or cold air is introduced into the duct 26 by a cooling medium feed pipe 27a that is inserted into the pipe shaft from one end of the pipe shaft 20 and whose tip penetrates the pipe shaft wall and enters the duct 26. W is introduced, and the introduced medium is passed through the pipe shaft 2.
The liquid is sequentially discharged from a discharge vibrator 27b which is provided at the other end of 0 and has the same configuration as the vibrator 27a shown in -.

Thus, the suction roll l having the above configuration is driven to rotate around the pipe shaft 20, and the vacuum pump P is driven to suction and expel the air in the air suction duct 25 through the vibe shaft 20→the communication hole 20a. In addition, the refrigerant W is introduced into the cooling medium duct 26 from the pipe 27a, and the introduced refrigerant is sequentially discharged through the pipe 27b. Then, the outer surface area of the air-permeable porous member 2 corresponding to the circumferential surface area of the intake roll passing through the arcuate body surface 25a area of the air suction duct 25 enters the outside air suction state.

The intake roll region that has rotated through the area range of the arcuate body surface 25a of the air suction duct is then cooled in the process of rotationally passing through the area range of the arcuate body surface 26a of the cooling medium duct 26.

The air-permeable porous member 2 is attached to an intake roll l as shown in FIG. 5(a).
An endless rotation belt may be suspended between the roller and the pair of suspension rolls 30.

The separation of the sheet S from the two surfaces of the breathable porous member is shown in Figure 5 (b).
), as shown by the two-dot chain line in FIG. 3, a separate separation roll 31 may be provided next to the counter-rotating roll 3, and the separation may be carried out by this separation roller.

The opposing rotary pressure roll 3 and separation roll 31 may be
A predetermined cooling temperature is always maintained by introducing cooling water, cold air, etc. into the interior.

The part where the sheet S supplied to the air-permeable porous member 2 surface of the intake roll 1 starts to be peeled off by the counter-rotating roll 3 or the separation roll 31 is located on the lower wave side of the roll rotation direction of the intake area on the intake roll 1 side. It is appropriate to set it near the end or near the same end of the cooling region 26a.

The suction roll 1 itself may be made of an air-permeable metal powder sintered body or a metal sprayed fleshy body.

The plastic sheet S to be supplied may be a pre-manufactured sheet that has been sufficiently softened by heat using a heating device, or may be a sheet that is still sufficiently softened immediately after coming out of a rolling device.

Alternatively, it may be a composite layer sheet in which a backing material sb (indicated by a two-dot chain line in FIG. 1) made of an arbitrary material is laminated on the back side of the sheet.

The material plastic sheet S is a variety of soft and semi-hard thermoplastic sheets, such as vinyl chloride resin,
Seams such as polyethylene resin, polypropylene resin, T-P-E resin, E-V-A resin, etc. can be used. In general, those having a low M-1 value (melting point) (for example, an M-I value of 10 to 50) and those containing relatively large amounts of plasticizer and rubber are suitable. In the case of a composite layer sheet, the backing material sb may be a solid or foamed fleshy sheet of the same or different type as the sheet on which the crystals are formed, woven fabric, knitted fabric, nonwoven fabric, reinforced paper, or any other material.

The material of the permeable porous member 2 wound around or suspended around the outer circumferential surface of the intake roll 1 is heat resistant, and in the process of peeling the sheet S from the outer surface of the member, the material prevents the sheet from being excessively attached to the outer surface of the member. The adhesive strength with the sheet S is such that the resin content of the sheet does not substantially or excessively adhere and transfer due to the adhesive strength, and even if some adhesion occurs, it can be easily scraped off and removed by rubbing with a brush 14 or the like. It is preferable to use a material with a weak adhesive strength, or a material whose mutual adhesion with the sheet S has been weakened by coating treatment or the like.

In order to efficiently scrape off and remove the resin that has more or less adhered to the outer surface of the air permeable porous member 2 from the sheet S side with the cleaning brush 14, the air permeable porous member 2
An air blowing duct 28(
Contrary to the case of the air suction duct 25, air may be blown out from the area of the permeable porous member surface corresponding to the brush 14 by disposing an air suction duct (shown by a two-dot chain line in FIG. 3).

A manufacturing apparatus as shown in FIGS. 2 to 4 was constructed, and 8-ring plastic seams were manufactured under the following conditions.

a, Extruded sheet S Material resin: 100 parts by weight of vinyl chloride resin (P 700), 70 parts by weight of plasticizer (D, 0.P), extrusion melting temperature = 200° C1, thickness = 21, width: 1200 mm,
Extrusion speed: 20mm/5ee b, suction roll l Breathable porous member 2: Stainless steel wire mesh with a sieve opening of 500 l according to JIS Z8801, peripheral rotation speed:
22mm/qec, water-cooled C1 pressure roll 3 Water-cooled metal roll, peripheral speed of rotation: 25rxya/5ead
, Cooling device 12 Cold air type By this method, it was possible to continuously produce a plastic sheet with a 6-piece structure having numerous thin hair-like or needle-like crystals with a hair length of about 5 mm formed at a high density.

C. Effects of the Invention As described above, according to the method of the present invention, this type of six-sided plastic sheet with long and thin fibers formed at high density can be produced without using an expensive metal engraving roll. It can be mass-produced at low cost, and its intended purpose is well achieved.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of crystal formation, Fig. 2 is a schematic diagram of an example of a production line, Fig. 3 is an enlarged cross-sectional view of an example of the configuration of an intake roll, and Fig. 4
The figure is a longitudinal cross-sectional view along the line 17-IV in Figure 3, and Figure 5 (a
) and the same figure (b) are schematic diagrams of modified examples, respectively. 1 is an intake roll, 2 is an air permeable porous member, 3 is a pressure roll,
S is the plastic sheet and Si2 is the formed crystal.

Claims (2)

[Claims] (1) A permeable porous member (2) is wound or suspended around a rotating intake roll (1) with its outer peripheral surface as an intake surface, and the surface moves as the intake roll rotates, and the air intake state is brought to an intake state by the intake action of the intake roll. A heat-softened plastic sheet (S) is supplied to the surface of the air-permeable porous member (2) and passed through a nip between an intake roll and a rotating roll facing the roll, and the plastic sheet that has passed through the nip is Venting the plastic sheet based on the suction action of the suction roll by conveying the sheet along the surface of the rotating opposing roll (3) or along the surface of the separation roll (31) provided next to the roll. 1. A method for manufacturing a glued plastic sheet, which comprises sequentially peeling off the adhesive from the surface of the porous material against the suction adhesion force to the surface of the material. (2) The method for producing a glued plastic sheet according to claim 1, wherein the breathable porous member (2) is a woven fabric, a knitted fabric, a nonwoven fabric, or a wire mesh.