Film stretching device and manufacturing method for stretch film

A technology of stretching device and manufacturing method, which is applied in the field of film stretching device and stretched film manufacturing, can solve problems such as film fracture, achieve the effect of suppressing fracture and realizing large-scale

Active Publication Date: 2019-08-09
NITTO DENKO CORP
View PDF11 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with such oblique stretching technology, problems such as film breakage may occur as the stretching ratio increases.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Film stretching device and manufacturing method for stretch film
  • Film stretching device and manufacturing method for stretch film
  • Film stretching device and manufacturing method for stretch film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] (Production of polyester carbonate resin film)

[0150] Polymerization was performed using a batch polymerization apparatus consisting of two vertical reactors each including a stirring blade and a reflux cooler controlled at 100°C. 29.60 parts by mass (0.046mol) of bis(9-(2-phenoxycarbonyl ethyl)fluoren-9-yl)methane, 29.21 parts by mass (0.200mol) of ISB, 42.28 parts by mass of (0.139mol) of SPG, 63.77 mass parts (0.298mol) of DPC, and 1.19×10 －2 Parts by mass (6.78×10 －5 mol) of calcium acetate monohydrate. After depressurizing and nitrogen-substituting the inside of the reactor, it was heated with a heating medium, and stirring was started when the internal temperature reached 100°C. 40 minutes after the start of temperature rise, the internal temperature was brought to 220°C, and the pressure was reduced while controlling to maintain the temperature, and the pressure in the reactor was set to 13.3 kPa within 90 minutes after the temperature reached 220°C. Phenol...

Embodiment 2

[0161] Use a rectangular jig with a lower surface of the upper holding member of 45mm x 25mm, and if Figure 13 As shown in (b), except that the distance (D) from the edge of the film to the clamping position was 25 mm, the film was held by a clamp, and the same as in Example 1, until the film was broken. The diagonal stretch ratio at breakage was calculated, and a film just before breaking was produced based on the diagonal stretch ratio at breakage, and the amount of neck-in at the time of breakage was obtained. The holding length (L) and holding amount (W) are 45mm and 25mm, respectively.

Embodiment 3

[0163] Use a rectangular jig with the lower surface of the upper holding member of 45mm x 20mm in size, and if Figure 13 (b) shows that the distance (D) from the edge of the film to the clamping position is 20 mm, except that the film is held by a jig, and the film is tilted in the same manner as in Example 1 until the film breaks. Stretching was carried out to calculate the oblique draw ratio at breakage, and a film just before breakage was produced based on the diagonal draw ratio at breakage, and the amount of neck-in just before breakage was obtained. The holding length (L) and holding amount (W) are 45mm and 20mm, respectively.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to view more

Abstract

The invention provides a clamp type film stretching device. The fracture of film caused by the increase of the elongation ratio can be suppressed. The clamp type film stretching device has left and right clamps of variable pitch type. The left and right clamps grip the left and right ends of the film to be stretched and travels in the stretching region, and the clamp spacing in the longitudinal direction varies with the travel, and the clamps grip positions of the film at a distance of 20 mm or more from the left and right end edges.

Description

technical field [0001] The invention relates to a film stretching device and a method for manufacturing a stretched film. Background technique [0002] Circularly polarizing plates are used in image display devices such as liquid crystal display devices (LCD) and organic electroluminescent display devices (OLED) for the purpose of improving display characteristics and antireflection. Typically, a circular polarizing plate is formed by laminating a polarizer and a retardation film (typically a λ / 4 plate) such that the absorption axis of the polarizer and the slow axis of the retardation film form an angle of 45°. . Conventionally, typically, a retardation film is produced by uniaxial stretching or biaxial stretching in the longitudinal and / or transverse directions. Therefore, in many cases, the retardation axis is along the transverse direction (width direction) of the original film roll. ) or portrait (lengthwise) rendering. As a result, in order to produce a circularly p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/16B29L7/00
CPCB29C55/165B29L2007/00
Inventor 清水享千田裕树山本真士
Owner NITTO DENKO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap