Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing multilayer foamed sheet

A foamed sheet, foamed layer technology, applied in chemical instruments and methods, lamination, layered products, etc., can solve problems such as poor appearance

Inactive Publication Date: 2002-10-09
SUMITOMO CHEM CO LTD
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We have endeavored to study a method of preparing multi-layer foamed sheets by multi-layer circular die coextrusion process and found that in the multi-layer circular die co-extrusion process usually using multi-head piping, the observed undesirable appearance is more accurate The ground is a scale shape with a diameter of several centimeters, rather than the disadvantage of wide distribution as mentioned above

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Embodiment 1 (extrusion foaming test)

[0117] Using the method described below, a two-material three-layer polypropylene resin multilayer foamed sheet was prepared in which the foamed layer was sandwiched between non-foamed layers as an intermediate layer.

[0118] Use 65mm-ID corotating twin-screw extruder (L / D=41.5, L: effective screw length, D: screw diameter) as foam layer extruder and 60mm-ID single-screw extruder (L / D=30) as a non-foaming layer extruder, the two types of extruders are equipped with a 230mm-ID multi-layer circular die (outer die lip radius r 2 =11.710cm, radius of inner die lip r 1 =11.515cm, die lip seam r 2 -r 1 = 0.195 cm).

[0119] Contains nuclei with 1PHR (manufactured by NIPPON BOEHRINGER INGELHEIM, * HYDROCELLOL * CF40E) 70 parts by weight of the polypropylene resin PP1 (MFR=12) obtained in Reference Example 1 [5] as described above and 30 parts by weight of low-density polyethylene PE1 (manufactured by SUMITOMOCHEMICAL CO., LTD., ...

Embodiment 2 and comparative example 1

[0123] Using different resins for the non-foamed layer and using a procedure similar to Example 1, the results summarized in Table 1 were obtained.

[0124] Non-foamed layer resin

interlayer interface

shear stress

scaly exterior

view

degassing

expand

Rate

thickness

Types of

K

n

-

Pa.s n

-

Pa

-

-

-

mm

Example 1

PP2

8500

0.377

36100

○

○

3.7

1.0

Example 2

PP3

5910

0.407

30140

◎

○

3.7

1.0

Comparative example 1

PP4

16230

0.342

51560

×

◎

3.7

1.0

[0125] Remarks: 1) Non-foaming layer resin

[0126] PP2: Manufactured by SUMITOMO CHEMICAL CO., LTD., NOBLENEAW161C (MFR=8)

[0127] PP3: Manufactured by SUMITOMO CHEMICAL CO., LTD., NOBLENEAY161C (MFR=15)

[0128] PP4: Manufactured by SUMITOMO ...

Embodiment 3 and 4

[0130] Examples 3 and 4 adopted a procedure similar to that of Example 1, except that two and three formulations were used as non-foamed layer resins respectively. The results are summarized in Table 2.

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
melt flow indexaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing a multi-layer foamed sheet, wherein the scaly appearance of the multi-layer foamed sheet is improved through a multi-layer circular die co-extrusion method, and a multi-layer circular die co-extrusion method Extrusion method, a method for preparing a multi-layer foam sheet with a foam layer and a non-foam layer, the multi-layer circular die co-extrusion method is a method for preparing a multi-layer foam sheet, wherein the interface of each layer The shear stress is 5000Pa or higher, but not higher than 50000Pa, a method for preparing a multilayer foamed sheet, wherein the non-foamed layer resin is a melt flow rate of 5-30 g / 10min Linear polypropylene resin, and a method for producing a multilayer foamed sheet, wherein the foamed layer resin has a melt tension (MT) at 190°C and a melt flow rate (MFR) at 230°C A polypropylene resin satisfying the following Equation A: MT≥7.52×MFR (−0.576) [Equation A].

Description

technical field [0001] The invention relates to a method for preparing a multi-layer foam sheet composed of a multi-layer structure through a circular die co-extrusion method. Background technique [0002] As an advantageous method for producing a multilayer foamed sheet composed of a multilayer structure, a co-extrusion method is proposed in which a plurality of extruders are used to plasticize and melt resin materials corresponding to each layer, followed by When extruding the die, the molten resin supplied from each extruder is laminated and integrated in the die. [0003] Japanese Unexamined Patent Publication No. 7-16971 discloses that by performing a co-extrusion T-die foaming step, while co-extruding, the flow rate of the polyolefin resin layer (A) is adjusted to be similar to that of the foamed polyolefin resin layer (B) The amount of flow can improve the unevenness of the transverse thickness of each layer. [0004] This non-uniformity in thickness is a common def...

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): C08J9/04B29C48/10B29C48/32B29K23/00B29K105/04B29L7/00B29L9/00B32B5/22B32B27/32B32B37/15C08F10/06
CPCB29C44/24B29K2023/086B29K2023/12B29L2009/00B32B5/22B32B27/32B32B37/153B32B2305/022Y10S264/92B29C48/09B29C48/21B29C48/335B29C48/10B29C48/18
Inventor 坂本昭宣多久野茂文永松龙弘
Owner SUMITOMO CHEM CO LTD