JPH03173643A - Partially melting and lamenting method for cellular buffer material - Google Patents

Abstract

PURPOSE:To simply perform lamination processing without requiring an expensive laminating apparatus or an expensive adhesive by a method wherein a plurality of cellular buffer materials are introduced into a press bonding part and the cellular surface layer parts thereof are heated and melted by the heaters arranged in close vicinity to the press bonding part to bond the cellular buffer materials under pressure and the cellular buffer materials are laminated using the cell top parts of both buffer materials as adhesive parts. CONSTITUTION:The cell top parts of foam buffer materials are melted and other sheet like article having material quality having compatibility as a surface layer part is brought into contact with the cellular buffer material to be bonded and laminated thereto under pressure. At this time, by making the heat value of a heater 2, the distance with the cell top parts and the correlation between the temp. and moving speed of the cellular buffer material proper, the cellular buffer material and the other sheet like article are bonded without destructing cellular parts. When the cellular buffer materials put on the market for the purpose of general packing are laminated using the mutual cell top parts thereof as adhesive parts, both cellular buffer materials are melted and bonded under such a condition that the temp. of the buffer materials is 25 deg.C, a sheath heater having heat value of 10W/cm is used in the heater 2, the distance between the cell top parts and the surface of the heater is 2cm and the interval of a press bonding part is 8mm and the passing speed in the press bonding part is 2/min.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention provides a method for laminating foam cushioning materials or laminating them with other sheet materials without using adhesives or the like. It is about.

(b) Conventional technology The surface layer of currently used foam cushioning materials is made of low-density polyethylene or its copolymer, so when they are laminated or laminated with other sheet materials. If this is heated and melted, it can be bonded to other similar surfaces without the need for an adhesive such as a melted polyethylene film, but if the top of the bubble of the foam cushioning material is used as the adhesive part, Since the film is thinner than other parts, its mechanical strength is low, especially in the molten state, and it is even weaker, so it is impossible to pass it through the nip roll part of conventional laminating equipment, so foam cushioning is used. A commonly used method is so-called sandwich lamination, in which the materials are left in their normal state and a molten low-density polyethylene film is sandwiched between them as an adhesive.

(c) Problems to be Solved by the Invention The present invention has problems that the prior art requires expensive equipment;
Since adding a new layer of polyethylene film has drawbacks such as loss of flexibility, the object of the present invention is to provide a bonding method that is simple and can minimize changes in cushioning properties.

(d) Means for solving the problem If we explain an example in which foam cushioning materials are laminated together using the tops of the foams as adhesive parts using the present invention, Figure 1 shows the lamination process. Layout diagram of machine rolls, etc.
The foam cushioning material pulled out from the feeding shaft 4, 4° is introduced into the crimping parts 1, 1'' installed at intervals, or the foam surface layer is heated by the heating element 2 installed in the vicinity of the crimping part. The parts are heated and melted, bonded at the crimping part, and after cooling, the film is wound around the winding shaft 5.

(E) Action At this time, the foam portion can be bonded without being destroyed by appropriately establishing the correlation between the calorific value of the heating element 2 and the distance to the top of the foam, the temperature jlffl of the foam cushioning material, and the moving speed. I can do it. Further, to explain this with respect to Example 1, a foam cushioning material (
When bonding two pieces (11 tsubo 11 tsubo) with the top of the foam as the adhesive part, use the foam cushioning material at a temperature of 25°C, and use a sheathed heater with a heat generation rate of ff11OW/cm as the heating element. Distance from surface 2cm, distance between crimped parts 8m
m (because the foam cushioning materials are pasted together, the spacing is doubled)
, melt adhesion was possible under the conditions of passing through the IEJF section at a speed of 2 m/min.

(f) As described in detail, the present invention is based on expensive laminates and equipment.
Or contact? It is possible to easily achieve bonding strength without the need for additives or loss of flexibility, especially when the membrane constituting the foam cushioning material is a composite membrane of a polyethylene layer and a polyamide layer. As for the case where the softening point of the boriamite layer is higher than that of the polyethylene layer, the present invention is extremely easy to implement and its economical effects are significant.

[Brief explanation of the drawing]

Claims (1)

[Claims] 1 Place the foam cushioning material between the crimped parts (1, 1') with a gap that is below the height of the bubble part of the foam cushioning material immediately after molding and at least the height of the bubble part in a stable state after being left at room temperature. The surface layer of the foam head of the material is melted, and another sheet-like material whose surface layer is made of a material that is compatible with the foam head when melted is brought into contact with this part and passed through and crimped, without using adhesives etc. How to laminate.