JPS6083823A - Manufacture of thick and cylindrical formed object of polyester - Google Patents

Abstract

PURPOSE:To obtain the titled formed object excellent in thickness distribution and strength by thermoforming a specified polyester sheet in a specified forming condition to the shape of a bottomed cylinder and cutting off the mouth part and the bottom part of the formed object. CONSTITUTION:Substantially non-oriented and amorphous polyester sheet 5 (300mum max. in thickness) that is composed mainly of polyester in which the intrinsic viscosity is 0.5 min. and the main repetition unit is ethylene terephthalate is thermoformed with molds 1, 2 and drawn deeply into the bottomed and cylindrical formed object 6 of the ratio of length/diameter 3 or more. The bottom part and the mouth part are cut to obtain the cylindrical formed object uniform in thickness distribution.

Description

[Detailed description of the invention]

[Industrial Application Fields] The non-explosion method is used in the production of cylindrical molded bodies used in the n11 sub-equipment industry, and is used in devices, etc. ++l 1. -1 Specifically, it has a smooth surface on its inner surface and/or surface on which a high W/1 degree recording element can be mounted, and has a thin and uniform wall thickness. This article relates to a method for producing a cylindrical molded article made of ethyl alcohol. [Prior art] 4+YX 11 s - Method for producing a thin cylindrical molded body made of steel, for example l) V 1ift
38-18978-dunoni, so-called inflation molding method or tag Kosho No. 46-32080,
A method is known in which a tubular preformed body formed by stretch molding is stretched and expanded between a supply roll and a take-up roll. However, the molded product obtained by this manufacturing method has defects such as fold marks and vertical scratches (dice';/) that occur when being punched out from a die because it is in a flat folded state. In the case where these molded bodies are used as carriers for 0-element T, nuclear defect portions are a major drawback in use, and therefore improvements are desired. [Object of the invention] The present invention was made in consideration of the situation in the north,
The purpose is to have a cylindrical shape with a thin wall, a surface smoothness without defects such as creases, and a uniform thickness distribution (L), excellent strength and heat-resistant dimensional stability. The object of the present invention is to provide a method for manufacturing a polyester molded article having the following. [Structure of the Invention] The present inventor focused on such problems, and as a result of research on the 9 μm manufacturing method of thin cylindrical molded products without the above-mentioned defects, the present inventor developed a method for manufacturing a 9 μm thin cylindrical molded product using a specific polyester sheet. Due to the circumstances, the bottomed cylindrical preform was aged ICY l-, and then
The inventors have discovered that the defects can be improved by cutting and removing the mouth and end portions of the Yonan molded body, and have achieved the present invention. That is, the present invention mainly uses a polyester having a stiff-shoulder-reflexivity of 0.5 or more and a repeating unit of 1.1, which is ethylene terephthalate. Rolled polyester sheet with quality and thickness of 300μ or more
nJ'! 1 within the range of 1 hot ship. + Yes (Frag metal shop and Gyahitei mold PR made J1 body) / +
The gi diameter ratio will be more than 3 times (a + ki closed, a 1 base circle 7
:'i) This is a method for producing a circular shaped molded product made of polyniskel, which is characterized in that after the product is thermoformed into a circular shaped molded product, the bottom and L'' portions are cut to produce a circular molded product. The polyester in the present invention is mainly 5-polyethylene terenotale I/rehomopolymer, but a part of the terephthalic acid component can be added to, for example, inphthalic acid, naphthalene dicarboxylic acid, diphenyldicarphonic acid, cyphenoki/ecundicarpone, ginenyl-f-deluncalphone. , Diphenylsulfone dicarphone I&etc.'
aliphatic dicarboxylic acid such as adipic acid, cehatic acid, acelaic acid, etc. [71;
One or more other bifunctional carbonic acids such as p-β-human r1 quinidoxybenzoic acid, ε-oxycarboxylic acid, and/or a part of the ethylene glycyl component, for example Trimenalene glycol. No 1 lame f-lenge glycol, - xamethylene glycol, tecamethylene glycol, /F open f-L horn glycol, /nee f-17 glycol. ;, 1-encrohex→)/dimethyl, 1,4-7
riaheki-leanlame1~rJ-le,2,2-his(4
′-β-hydro=\-);1-Tokinofue! Le) Floppan. Multi-fit of other glycols such as 4'-β-human aquinoethyl/noylinsulfonic acid and their functional derivatives;
Even if it is a copolymer copolymerized within a range of [wt'% or more]. The polyester sheet used for misfires has an inherent viscosity r*:
<hereinafter abbreviated as IV) is 0.5 or more, substantially no Mt'
, is amorphous and has a thickness of 300 μm or more. When 1v is lower than ()95, thermoforming the sort (C
When heating the film to the drawing temperature, clear crystal bubbles may occur, making it difficult to draw, and even if it can be formed, the thickness will be uneven, and the thickness will be very large. Disadvantage 7)・Aru-I
It is preferable that V is 0.6 or more and VO is 7 or more because the thickness is uniform and there is little vertical to roughness. In addition, the sheet is made of cytocrystalline 'IIJ with substantially no orientation, but if the sorting is oriented 9M, the circumferential thickness of the obtained molded body 11 will be extremely low in IC<7:C. . Also, when the sheet is in a crystalline state (rG), VJ [Oki-l shadow expansion becomes difficult. The crystalline state of the note is for example the sort σ)
41 who knows from the secret comes ui, but If:L:l. The density is below 34J//i. The thickness of the sort is 300μ or more r-', and if it is thicker than 300μ, the thin-walled molded product that is the object of the present invention cannot be produced.In the AX invention, such a polyester sheet is aged). Bottom cylindrical 'f'
After that. u of the preform? The length/diameter ratio (hereinafter L/D
(abbreviated as ) should be deep drawn with a diameter of 3 inches or more. L/
If I) is smaller than 3, the thickness distribution in the axial direction will be less than 1 (<, 7.
．． 1'/, 1゜When L/D is 3 or more, 0ko, l-, T゛Sofunn + 111dt <, wall thickness A[i uneven 5'
Cut 1 HiXy), I. Samurai that is practical enough even if J + σ) Cylindrical body I1! I can do that. In the present invention, thermoforming refers to i1 = air forming method and/or vacuum forming method, as shown in Fig. 1 (a!, (bl)
+ (C1 ge, shows an example of the thermoforming method. 1st cut, 1st cut, 1' yahipui, 301 heat, 4 is clan-7, 5 is thermoforming J (I) The ester film 5 shown in Figure fa) is 74'', J. During thermoforming, the ester film 5 is held by a flanz 4 and heated to the stretching temperature by the heater 3. is moved from above the film 5, the plaque 1 is pressed from above the film 5 and pushed into the cavity 2, and the film 5 is formed into a cylindrical preformed body 6 with a bottom (see figure (b)).Plug], Cavity 2 is heated, and at the same time, compressed air is blown into flag 1 or 6 (pressure forming), or the cavity 2 is depressurized to r −4−<・(vacuum forming).

[
2 or perform both at the same time: l-ll1. i molded body 6
is shaped into the shape of cavity 2. The shaped preform 6 is made of a plaque 1. Gear 2
(C) Figure fB l1ti ),
Preliminary molding of the molded body is completed. As mentioned above, the heating of the polyester sheet during thermoforming is performed by forming a polyester sheet with a circular cross-sectional shape using a heater, for example, a disk-shaped or ring-shaped sheet. There are 714 types of heaters or combinations of them. If the cross-sectional shape of the heater is other than circular, the thickness distribution in the circumferential direction of the 11φ body will be uneven, which is preferable [-1 (No. Although the heater pressure heats the 11 ester fill-no), the ilm The temperature after heating is the stretching temperature of the polyester, and when p g 'r is 144, it is 80 ° C.
〜+6 [1'C1 Preferably 110-130゛(7
It is. . Plugs and cavities used for thermoforming should have a mirror-like surface in contact with the molded body, and the cable angle should be 0.1° or more. It is possible to prevent scratches on the surface of the molded product.It is even more preferable to use a mold whose surface has been treated with Pflon or Teflon-containing τS2. 1-
・The flag temperature during thermoforming is set to the stretched Hffi state and C
-2 Temperature of 71゛I sheet -20'C or more -1
- Binding, 1) In the case of ET, the temperature is 100°C or higher, and the temperature is +2°C JJ soil. If the plug temperature is lower than the polyester sorting temperature -20'C, disadvantages such as non-uniform thickness distribution of the molded product and poor heat-resistant dimensional stability will occur. The temperature of the Hollyester sheet is almost the same as that of 2015, which is ideal for Hakui. The measured cavity temperature is ± the glass transition temperature of polyester.
20°C, preferably +10°C (50 to 90°C, preferably 60°C in the case of polyethylene terephthalate)
~80°C). If the gear bifoil temperature is lower than the above range, the part of the sheet in contact with the soil surface will be locally low temperature, and the stretchability of the t? line will deteriorate. The cylindrical part of the bottom cylindrical molded body) has local wall thickness irregularities, resulting in poor wall thickness distribution. Also, the W-Yahitei temperature range is less than the above range, and between ( and the sheet part in contact with the cavity surface). A similar wall thickness distribution defect b′-, which is thought to be caused by a large adhesion force, occurs. However, it is necessary to heat-treat the preform or cylindrical molded body while restraining the cylindrical shape in a 1'11 manner to improve heat-resistant dimensional stability, roundness of the cross-sectional shape, and smoothness of the surface. [Example] Below, Kizuro Akira will be described in accordance with the following example. The main measurement conditions for temporal IIM are as shown below. IV): 0-chloroσnoel/-ol or Tet-Fuku OCI Ecno-7phenol mixture f night is taken as an electric medium, and constant at 6111 at 35°C. Buko density gradient - # fixed at 1 at 30C. Refractive index [n]: Atsube refraction emphasis 1 to l11i')Y,
Attach the plate and measure the refractive index of the 11 bars of the sample cut from the molded body using the 25°C thorium 1 wire. Glass transition temperature (TyJ: g + Ij determined by scanning differential thermal heating at a heating rate of 8°C/mm for amorphous Zanburu. In the actual example, PET indicates polyethylene rarephthalate.゜K male side-1 to 3 and comparative example-1 PET chips with 1V = 0.65 were dried at 160°C for 5 hours!l'l-1 Thorn JC, and the moisture content in the chips was reduced to o,
o o s wtZ, then feed the dry smoke chitno into an extruder equipped with a screw having a screw diameter of 65 mm and a slit-like shape at the tip, and extrude the P ICT sheet. Approximately 30℃ due to direct water cooling
It was cooled using a stainless steel drum adjusted to a temperature of 2.0 mm, and the wall thickness was 2 (1071, IV' = 0.60. ρ = 1.
33 fled, T, V-7oC amorphous 'I'l
I) E 'l'' sheet was obtained. This sheet was thermoformed using the method explained in Fig. 1. That is, it was fixed with scissors from above and below with a frame that believed the strain force shape hole of lOOmmXIOOmjn. (ra, sea) 1t
The center of the sheet was heated to about 130° C. by a ring-shaped heater with an inner diameter of JB105*i and an outer diameter of 200 mm located at a distance of 80*n from l+. The sheet is pushed into the cavity mold shown in Table-1 using the plug mold shown in the heating Jji table-IK, and 5 kg/cdG is heated from the flag mold.
Blow compressed air into the mold cavity to inflate the sheet until 11
1. Hold for about 5 seconds, reduce the pressure inside the molded body, open the molded body, and remove the molded body.
M started out. White, the temperature of the plug is 30°C.
. Gear temperature I (y is 80°C).
It is shown in FIG. FIG. 2 is a cross-sectional view of the bottomed cylindrical molded body in Example-2, where D is the flange surface, E is the bottom, and the value of the side m1 is the distance from the flange u11 (
al) is shown. Figure 3 shows Examples-1 to 3 and Comparative Example-1.
The number E8゜9.10 in the graph is the measured value of the molded bodies of Examples-1, 2, and 3, respectively, and 1] is the measured value of the molded bodies of Comparative Example-10). iill fixed i16
Show each other. The wall thickness distribution of Comparative Example 1 was uneven and poor, whereas the molded bodies of Examples 1 to 3 of this background had a good wall thickness distribution. FIG. 4 shows the circumferential orientation degree Δnx-z (difference between the refractive index nx in the circumferential direction and the Jnl refractive index nz in the thickness direction) of the molded bodies of Examples 1 to 3 and Comparative Example 1, and The number in
Indicates the measured value of Lee-1. In Fig. 4, in any case, up to about 2σ from the flange surface (area A) is 8nz: h≦0.0.
3. 0.03≦△ in the range from about 2 to 4 (area B)
nriU, 04°
4. Furthermore, the cylindrical part of the molded body was cut open and the sample was placed between orthogonal polarizing plates to remove the strain. The results are shown in FIG. Fifth
In the figure, (at, (bl, (cl) are the sample measurement results of Examples-1 to 3, respectively) are the sample measurement results of Comparative Example-1, and the numbers 2 to 12 are the distances from the flange surface (
σ), and the curve in the figure shows the outline of the interference curve caused by strain. In Figure 5, A' is the area where axial strain occurs, C' is the area where circumferential strain is generated, and B' is the area where axial and circumferential strain is mixed. Yes, A'-C'
This coincides with the regions A to C according to the degree of orientation (A'h4=z) explained in FIG. Next, each part of the cylindrical molded body was bent with the axial direction as an axis, and it was examined how long the length would be when the radius of curvature was set to 0.5 knots or less. As a result, in both cases, almost 100 giant salmon occurred in area A, and in area B, the occurrence rate was about 50%,
In region C, it was 0%. If the area C is used as a cylindrical body, there will be no problem of warping. Furthermore, the results of measuring the wall thickness AI+ in the circumferential direction are shown in Table 2. Table 2: In the case of the present invention, the degree of thickness deviation in the circumferential direction was -10μ or less, which was good, and when L/D was smaller than 3, it was bad. As is clear from the above results, the molded article obtained by the method of the present invention has good thickness distribution and strength. The molding machine is Asano R5+ RFC-IAPA.
A WSP type cosmic vacuum forming machine was modified and used as a pressure forming center. Examples 4 to 7 and Comparative Examples 2 to 3 Bottomed cylindrical molded bodies were molded in the same manner as in Example 2, except that the IV of PET was changed. The results are shown in Table 31C. Table 3 As in Example 7, in the case of IVO, 55, the degree of thickness deviation is in the range of ±lOμ, which is a usable range. Vertical salmon quality is somewhat difficult in area C. If the IV is less than 0.50, it cannot be used (・) If the IV is more than 0.60, it is good, especially if the IV is 0.70.
Above this, both the wall thickness distribution and the vertical moldability are extremely good. Examples 8 to 10 and Comparative Examples 4 and 5 Molded bodies were prepared and evaluated in the same manner as in Example 2, except that the polyester sheet used for thermoforming was changed. Table 3 shows the results.
Shown in -4-8 Table -3 *l Comparative example of biaxially stretched 1A PET film -6 Molding was carried out in the same manner as in Example -2 except that the existing rod-shaped heater (13a + X11, heater spacing 60fi) was used as the heater. I got a body. The obtained molded product had a cylindrical portion deformed into an elliptical shape, and the maximum wall thickness difference in the circular direction was about 40 μm, which was poor. Examples 11 to 17 and Comparative Examples 7 to 9 Example 2 except that the plug and cavity temperatures were changed as shown in Table 4.
The molding process was carried out in the same way. The results are summarized in Table 4. The temperature of PET T and 9G' was 70°C, and the temperature of PET Seavi after heating was 130°C. Table-4 1) ΔT, nib lug temperature - PET sheet temperature after heating completion [℃] 2) △T,: cavity temperature - T of PgT, 1
7(”C)3) A: Good B: Upper part of torso (area A-
A band-like thick part occurs in B). It can withstand use. C:
A band-like thick part appears in the center of the body, making it unusable. D: The molded product shrinks and deforms when taken out, making it unusable. 4) Circumferential shrinkage rate when left in hot air at 80°C for 24 hours. As explained above, by the method of the present invention, it is possible to produce a thin cylindrical molded article with good wall thickness distribution, excellent mechanical strength, and heat-resistant dimensional stability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic diagram of thermoforming of a sheet that can be used in the present invention, FIG. 2 is a cross-sectional view of a cylindrical molded article according to the present invention, and FIG. 3 is a diagram showing the wall thickness of a molded article according to the present invention. Distribution, 4th
The figure shows the orientation variation distribution, and FIG. 5 is a schematic diagram showing the state of the interference layer due to distortion of the cylindrical portion of the cylindrical molded body of the present invention. Fig. 1 Fig. 3 2 4 6 8 10 12 14 7 Run #; One-sided, 5 "Giant age l (Cm) Fig. S (α) (C) ('b)' Note)

Claims (1)

[Scope of Claims] 1. A material having an intrinsic viscosity of 0.5 or more, which is substantially non-oriented, amorphous, and has a thickness of 11 ester having a main repeating unit of ethylene tere 1/phthalate as a main component. 3
For stretching 00 μ or more I・-〇 11 Esler Run-1・f
i! 1. ! Rough mold and 1-1 chick! In 1.2, the IU of the molded body/
The diameter ratio is 31 (more than 1 cm), and it is thermoformed into a cylindrical molded body by deep drawing, and then the bottom and [1 part are cut off].
[Method for manufacturing a thin cylindrical molded product made of polyureus steel with a small diameter of 1 [♀] to produce a LC cylindrical molded product. 2. Thin cylindrical molding made of polyester according to [Special iiF Claims Disciple] Jc, characterized in that molding is carried out at a temperature of -20°C or lower. 3. A method for manufacturing a polyester sheet, characterized in that a root-shaped and/or ring-shaped heating element is used to heat the polyester sheet.
Method for manufacturing a thin cylindrical molded body made of Stell.