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Packaging foam sheet

A technology for foam sheet and packaging, which is applied in the field of foam sheet for packaging, and can solve problems such as poor appearance, bad packaging materials, packing materials, damage to the appearance of packaged items, etc., and achieve excellent softness and cushioning , to prevent the effect of bad surface

Active Publication Date: 2016-05-18
JSP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, recently, in the surface protection sheets of precision equipment and home appliances that have been painted, when the protection sheet is peeled off, poor appearance often occurs on the surface of the packaged article, especially when it is stored outdoors. It is particularly noticeable when the temperature rises, and damage to the appearance of the packaged goods has been reported
[0006] This phenomenon is not limited to the surface protection sheet, and even when the above-mentioned conventional polyolefin-based resin foam sheet is used as a packaging material, it has been confirmed that undesired patterns or patterns appear on the surface of the packaged body. Undesirable surface defects such as spots, or occurrence of part of the coating film components floating on the surface
[0007] Therefore, the development of packaging materials and packaging materials that do not cause such defects on the surface of the packaged body is strongly demanded, but the current situation is the result that has not yet been satisfied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] As the first extruder for forming the polyolefin-based resin foam layer, a tandem extruder in which an extruder with a diameter of 90 mm and an extruder with a diameter of 120 mm were connected to each other was used as As the second extruder for forming the polyolefin-based resin layer, an extruder having a diameter of 50 mm and L / D=46 (L is length and D is diameter) was used. In addition, at the extruder outlets of the first extruder and the second extruder, an annular die with a diameter of 94 mm was used for coextrusion of the foamed sheet.

[0071] To form a polyolefin-based resin foam layer, compared to low-density polyethylene (flexural modulus: 205MPa, MFR (melt flow rate) = 0.4g / 10min, manufactured by Sumitomo Chemical: trade name "Sumikasen F-102") 100 parts by weight of 3 parts by weight of the cell regulator masterbatch was mixed, supplied to the raw material inlet of an extruder with a diameter of 90 mm, and heated and kneaded to prepare a molten resin mixt...

Embodiment 2

[0090] The thickness of the foamed sheet for packaging in Example 1 is set to 1.02 mm, and the basis weight of the resin layer is set to 0.9 g / m 2 , except that it was the same as in Example 1, thereby obtaining the foamed sheet for packaging of the present invention.

[0091] The apparent density of this packing foam sheet, thickness, the flexural modulus of the substrate resin of resin layer, the average particle diameter D of filler, basis weight B, average thickness, D / B are as shown in table 1 and table 2 Show.

Embodiment 3

[0093] The thickness of the foamed sheet for packaging in Example 1 was set to 1.08 mm, and calcium carbonate was used as a filler instead of talc (manufactured by Shiraishi Calcium Co., Ltd.: trade name "Howaiton SB Blue"; average particle size 4.7 μm) , set the basis weight of the resin layer to 0.9g / m 2 , except that it was the same as in Example 1, thereby obtaining the foamed sheet for packaging of the present invention.

[0094] The apparent density of this packing foam sheet, thickness, the flexural modulus of the substrate resin of resin layer, the average particle diameter D of filler, basis weight B, average thickness, D / B are as shown in table 1 and table 2 Show.

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Abstract

The invention provides a foaming sheet material for packaging, which has a thickness ranging from 0.3 mm to 5 mm. The foaming sheet material is formed by laminating a resin layer with polyolefin system resin as the basic resin on at least one face of a polyolefin system resin foaming layer through co-extrusion. The foaming sheet material is characterized in that the bending modulus of the polyolefin system resin as the basic resin in the resin layer is below 600MPa. Five to forty weight percent of filling agents with an average particle diameter ranging from 2 mu m to 50 mu m are dispersed in the resin layer. The basis weight of the resin layer is 0.5-10g per m2. The ratio of the average particle diameter (D) (mu m) of the filling agents to the basis weight (B)(g / m2) of the resin layer is 1-12. Therefore, the foaming sheet material which has excellent flexibility, excellent buffering performances seldom damages a body to be packaged and can stably perform packaging. Even when a body to be packaged and having a coating film or a protective film on the surface is maintained in a high-temperature condition for long, the foaming sheet material can effectively prevent the surface of the body from being damaged.

Description

technical field [0001] The present invention relates to a foamed sheet for packaging, and more specifically, to a foamed sheet for packaging used as a packaging material / packaging material for various articles such as precision equipment, home electric appliances, electronic parts, and automotive parts. Background technique [0002] Polyolefin-based resin foam sheets have been useful as raw materials for various cushioning materials and packaging materials because they are soft, have excellent cushioning properties, and have water resistance, moisture resistance, and heat insulation properties. [0003] As such a foamed sheet, there is known, for example, a polyolefin-based resin foamed sheet described in JP-A-2005-74771 or JP-A-7-242285. [0004] In recent years, these resin foam sheets contain conductive additives or antistatic agents in the resin, which are difficult to adhere to dust and have softness and cushioning properties, so they are difficult to damage the package...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/18B65D65/40
Inventor 小泽正男青木健西本敬
Owner JSP CORP
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