KR940010713B1 - Method of film stretching - Google Patents

Method of film stretching Download PDF

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Publication number
KR940010713B1
KR940010713B1 KR1019910025195A KR910025195A KR940010713B1 KR 940010713 B1 KR940010713 B1 KR 940010713B1 KR 1019910025195 A KR1019910025195 A KR 1019910025195A KR 910025195 A KR910025195 A KR 910025195A KR 940010713 B1 KR940010713 B1 KR 940010713B1
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KR
South Korea
Prior art keywords
film
stretching
rail
rail portion
cooling
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KR1019910025195A
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Korean (ko)
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KR930012256A (en
Inventor
최병호
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주식회사 코오롱
하기주
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Priority to KR1019910025195A priority Critical patent/KR940010713B1/en
Publication of KR930012256A publication Critical patent/KR930012256A/en
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Publication of KR940010713B1 publication Critical patent/KR940010713B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The method improves a heat contraction ratio of the film by making possible longitudinal film stress release while performing a transverse film stretching process for bi-axial film stretching. The film stretching method comprises a step of driving individually a streching rail (10), a stress release rail (11) and a cooling rail (12) of a tenter; making the speed of the cooling rail (12) lower than that of the stretching rail (10) while releasing the film by rotating the stress release rail (11); performing a simultaneous process of the transverse and longitudinal film stretching by making a dance roll (14), positioned at the stress release rail (11), move up/down.

Description

필름 연신방법Film Stretching Method

제 1 도는 본 발명의 연신 방법에 관련하는 텐터의 개략 사시도.1 is a schematic perspective view of a tenter according to the stretching method of the present invention.

제 2 도는 본 발명을 구현하기 위한 텐터의 MD방향 릴렉스 존의 작용상태를 설명하기 위한 도면.2 is a view for explaining the operating state of the MD direction relaxation zone of the tenter for implementing the present invention.

제 3 도는 본 발명에 관련하는 텐터의 각 파트별 기능을 설명하기 위한 도면.3 is a view for explaining the function of each part of the tenter according to the present invention.

제 4 도는 일반적인 텐터의 연신 작용을 설명하기 위한 도면이다.4 is a view for explaining the stretching action of a general tenter.

본 발명은 필름 연신방법에 관한 것으로서, 보다 상세하게는 횡연신이 진행되는 중에 종연신에 대한 응력완화가 이루어지도록 하여 양호한 연신상태를 얻을 수 있도록 한 필름 연신방법에 관한 것이다.The present invention relates to a film stretching method, and more particularly, to a film stretching method in which stress relaxation of longitudinal stretching is performed while transverse stretching is in progress so that a good stretching state can be obtained.

더욱 구체적으로는 폴리에스테르 또는 에틸렌 나프탈레이트 필름등의 축차 2축 연산시 필름의 종방향으로 응력완화가 가능하도록 하는 필름 연신방법에 관한 것이다.More specifically, the present invention relates to a film stretching method that enables stress relaxation in the longitudinal direction of a film during sequential biaxial calculation such as polyester or ethylene naphthalate film.

일반적으로 상기한 필름은, 먼저 원료, 촉매, 첨가물등을 일정량 배합하여 필름에서 요구되는 중간 생성물인 칩을 생산하고 이를 건조시킨 후 용융 토출하여 캐스팅 드럼에서 시이트 형상으로 만든 다음, 종연신기에서 예열, 종연신, 냉각등의 공정을 거쳐 종방향으로 3 내지 5배 연신시킨 후, 동일한 방법으로 횡연신기에서 예열, 횡연신, 냉각등의 공정을 거쳐 횡방향으로 3 내지 5배 연신시킨 다음, 이때 얻어진 필름의 두께를 측정하고 정전기를 제거한 후 균일한 장력 및 형태로 와인딩하여 적당한 폭과 길이로 절단하여 요구하는 필름을 얻고 있다.In general, the film is prepared by first mixing a predetermined amount of raw materials, catalysts, additives, etc. to produce a chip, which is an intermediate product required in the film, and drying it, and then melt-discharging the sheet into a sheet shape in a casting drum. After stretching 3 to 5 times in the longitudinal direction through a process such as longitudinal stretching and cooling, and stretching 3 to 5 times in the transverse direction in the same manner as a preheating, transverse stretching and cooling process in a transverse stretching machine. After measuring the thickness of the film and eliminating static electricity, the film is wound in a uniform tension and form, cut into suitable widths and lengths to obtain the required film.

제 4 도는 필름 연신에 사용되는 텐터의 일예를 도시하고 있는데, 1쌍의 레일(1)(2)이 나란하게 배치되어 있으며, 이들 레일(1)(2)에는 별도의 모터에 의해 레일 주위를 이동하는 클립(3)이 다수개 설치되어 있다.4 shows an example of a tenter used for stretching a film. A pair of rails 1 and 2 are arranged side by side, and these rails 1 and 2 are arranged around a rail by a separate motor. A plurality of moving clips 3 are provided.

상기한 레일(1)(2)은 필름(F)이 진입하는 입구측에 예열부(A)가 마련되고, 이어서 횡연신부(B)가 마련되고 있으며, 히팅 셋팅부(C) 및 쿨링부(D)가 순차적으로 이어지고 있다.The rails (1) and (2) are provided with a preheating portion (A) at the inlet side into which the film (F) enters, followed by a transverse stretching portion (B), and a heating setting portion (C) and a cooling portion ( D) is followed sequentially.

이와 같은 구조의 축차 2축 연신기는, 종방향의 열수축율 조정을, 종방향 연신후 횡방향 연신이 이루어지기 전, 종연신기의 후반부 롤의 회전속도를 종연신이 이루어지는 롤의 회전속도보다 느리게 하는 동시에 종연신의 후공정인 쿨링시의 온도보다 온도를 상승시킴으로서 가능하게 하고 있으나, 이러한 방법은 작업성을 저하시키는 요인이 되고 있으며, 필름이 늘어나는 현상이 발생하여 종연신 강도가 떨어지고 종연신 부위에서 연신 불균일이 발생하는 문제점이 있다.The sequential biaxial stretching machine of such a structure makes the thermal contraction rate adjustment of a longitudinal direction slower than the rotation speed of the roll in which longitudinal stretching is made, before the longitudinal stretching is performed after longitudinal stretching, and transverse stretching is performed. This is made possible by raising the temperature higher than the temperature at the time of cooling, which is the post-process of longitudinal drawing, but this method becomes a factor that lowers workability, and the film is stretched, the longitudinal stretching strength is lowered and the stretching nonuniformity at the longitudinal stretching site. There is a problem that occurs.

본 발명은 상기한 바와 같은 종래기술의 문제점을 해소하기 위하여 발명된 것으로서, 본 발명의 목적은 작업성을 개선함과 아울러 균일한 연신을 얻을 수 있는 필름 연신방법을 제공하는데 있다.The present invention has been invented to solve the problems of the prior art as described above, and an object of the present invention is to provide a film stretching method that can improve the workability and obtain uniform stretching.

이를 실현하기 위하여 본 발명은, 텐터를 연신 레일부와 응력완화 레일부, 그리고 쿨링 레일부로 나누어 개별구동시키고, 상기한 응력완화 레일부를 외측으로 회전시켜 필름이 클립으로부터 해방되도록 함과 아울러 쿨링 레일부의 레일속도를 연신 레일부의 레일 속도보다 느리게 하고, 댄스 롤을 승강시켜 필름의 텐션조절이 이루어지도록 함에 의해 종연신에 대한 응력완화가 이루어지도록 하는 필름 연신방법을 제공한다.In order to realize this, the present invention divides the tenter into an extension rail portion, a stress relaxation rail portion, and a cooling rail portion, and individually drives the same, and rotates the stress relaxation rail portion to the outside so that the film is released from the clip and the cooling rail portion It provides a film stretching method to make the rail speed of the slower than the rail speed of the stretching rail portion, the tension of the film is adjusted by lifting the dance roll to relax the stress for longitudinal stretching.

이하 본 발명의 바람직한 실시예를 첨부한 도면에 따라 더욱 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

본 발명에 의한 텐터는 크게 연신레일부(10)와 응력완화 레일부(11), 그리고 쿨링 레일부(12)로 구분된 독립 레일을 기본 구성요소로 하고 있다.The tenter according to the present invention has an independent rail divided into a stretching rail portion 10, a stress relaxation rail portion 11, and a cooling rail portion 12 as a basic component.

제 1 도는 이들 레일의 사시도로서, 연신 레일부(10)는 필름이 진입하는 입구측에서부터 제 4 도와 동일하게 예열부(A), 횡연신부(B), 히팅 셋팅부(C) 등이 마련되어 있다.FIG. 1 is a perspective view of these rails, in which the stretched rail portion 10 is provided with a preheating portion A, a lateral stretching portion B, a heating setting portion C, and the like in the fourth degree from the inlet side where the film enters. .

그리고 응력완화 레일부(11)는 평행하게 위치하는 1쌍의 레일의 중간에 축(13)이 설치되어 회전할 수 있도록 되어 있는데, 이것은 필름(F)을 클립(3)으로부터 이탈시키기 위한 수단으로 사용된다. 그리고 응력완화 레일부(11)에는 대향하는 위치로 승강하는 댄스 롤(14)이 다수개 설치되어 필름(F)의 텐션을 조절할 수 있도록 되어 있다.And the stress relief rail portion 11 is a shaft 13 is installed in the middle of the pair of rails that are located in parallel to be able to rotate, which is a means for detaching the film (F) from the clip (3) Used. And the stress relief rail part 11 is provided with a plurality of dance rolls 14 to elevate to the opposite position to adjust the tension of the film (F).

상기한 쿨링 레일부(12)는 출구측이 확장된 형상으로 이루어져 있으며, 이곳에도 필름을 잡기 위한 클립이 설치된다. 상기한 연신 레일부(10)와 쿨링 레일부(12)는 동일 수평면 상에 위치하고, 응력완화 레일부(11)는 이들의 아래측에 위치하게 된다.The cooling rail unit 12 has an outlet side formed in an expanded shape, and a clip for holding a film is also installed there. The stretched rail part 10 and the cooling rail part 12 are located on the same horizontal plane, and the stress relaxation rail part 11 is located below them.

이와같이 이루어지는 연신기에 의한 본 발명의 연신방법을 설명하면 다음과 같다.Referring to the stretching method of the present invention by the stretching machine made in this way as follows.

먼저 일련의 제조공정을 거쳐 만들어진 필름(F)이 연신 레일부(10)의 예열부(A)로 진입되어 클립(3)에 고정되면, 클립(3)이 레일을 따라 이동을 하게 되므로 필름(F)은 계속적으로 레일내로 진입하게 된다.First, when the film F made through a series of manufacturing processes enters the preheating portion A of the stretched rail portion 10 and is fixed to the clip 3, the clip 3 moves along the rail, so that the film ( F) continues to enter the rails.

이와 동시에 이곳에 설치된 히팅수단(도시생략)에 의해 일정온도로 필름(F)이 가열되는데, 이 상태에서 횡연신부(B)로 진입되면 레일이 확장되어 있기 때문에 필름(F)은 횡방향으로 늘어나게 된다.At the same time, the film F is heated to a constant temperature by a heating means (not shown) installed therein. In this state, when the film F enters the transverse drawing portion B, the film F is stretched in the transverse direction because the rail is extended. do.

그리고 히팅 셋팅부(C)내로 늘어난 필름(F)이 진입되면서 일정한 온도내를 통과하고 응력완화 레일부(11)내로 진입하고 이어서 쿨링 레일부(12)로 이동하면서 필름의 연신이 완료된다.As the film F extended into the heating setting part C enters, the film F passes through a predetermined temperature, enters the stress relaxation rail part 11, and then moves to the cooling rail part 12, thereby completing the stretching of the film.

이러한 과정이 진행되면서, 응력완화 레일부(11)에서는 레일이 축(13)을 중심으로 회전하면서 외측으로 벌려지는 상태가 되고, 이와 동시에 댄스 롤(14)이 상승과 하강하여 제 2 도에 도시한 바와 같은 상태가 된다.As this process proceeds, the stress relief rail portion 11 is in a state where the rail is opened to the outside while rotating about the shaft 13, and at the same time, the dance roll 14 is raised and lowered, as shown in FIG. 2. The state is as shown.

레일이 외측으로 회전하게 되므로 필름(F)은 클립(3)으로부터 해방되기 때문에 댄스 롤(14)의 승강작용이 가능하게 되는데, 이 작용은 필름(F)의 텐션을 조절하기 위하여 요구되는 것이다.Since the rail is rotated outward, the film F is released from the clip 3 so that the dance roll 14 can be lifted and lowered, which is required for adjusting the tension of the film F. FIG.

즉 쿨링 레일부(12)의 레일 이동속도를 연신 레일부(10)의 레일 속도보다 느리게 하면 필름(F)이 쳐지게 되는데, 이 필름(F)의 처짐량을 댄스 롤(14)의 승강으로 조절하게 되는 것이다.That is, when the rail moving speed of the cooling rail unit 12 is slower than the rail speed of the stretching rail unit 10, the film F is struck, and the amount of deflection of the film F is adjusted by the lifting of the dance roll 14. Will be done.

이상 설명한 바와 같이 본 발명에 의한 필름 연신방법은, 종방향 연신에 대한 응력완화가 필름의 횡연신이 이루어지는 텐터내에서 동시에 이루어지게 되므로 필름의 열수축율을 개선시킬 수 있고, 또 필름의 균일한 연신과 균일한 강도유지를 행할 수 있다.As described above, in the film stretching method according to the present invention, since the stress relaxation to the longitudinal stretching is simultaneously performed in a tenter in which the film is transversely stretched, the thermal contraction rate of the film can be improved, and the film is uniformly stretched. And uniform strength can be maintained.

Claims (1)

필름을 종방향과 횡방향으로 각각 연신하는 축차 2축 연신방법에 있어서, 텐터를 연신 레일부와 응력 완화 레일부, 그리고 쿨링 레일부로 나누어 개별적으로 구동시키고, 상기한 응력완화 레일부를 외측으로 회전시켜 필름을 해방한 상태에서 쿨링 레일부의 속도를 연신 레일부의 속도보다 느리게 함과 아울러 응력완화 레일부에 설치된 댄스 롤을 승강시켜 횡방향 연신이 이루어지는 동안에 종방향의 연신이 이루어지도록 함을 특징으로 하는 필름 연신방법.In the sequential biaxial stretching method in which the film is stretched in the longitudinal direction and the transverse direction, respectively, the tenter is divided into the stretching rail portion, the stress relaxation rail portion, and the cooling rail portion, and driven separately, and the above-mentioned stress relaxation rail portion is rotated outward. While the film is released, the cooling rail portion is made slower than the stretching rail portion, and the dance roll provided in the stress relief rail portion is lifted to allow longitudinal stretching while transverse stretching is performed. Film stretching method to do.
KR1019910025195A 1991-12-30 1991-12-30 Method of film stretching KR940010713B1 (en)

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KR1019910025195A KR940010713B1 (en) 1991-12-30 1991-12-30 Method of film stretching

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KR930012256A KR930012256A (en) 1993-07-20
KR940010713B1 true KR940010713B1 (en) 1994-10-24

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