| 摘要 |
PCT No. PCT/AU86/00248 Sec. 371 Date Apr. 30, 1987 Sec. 102(e) Date Apr. 30, 1987 PCT Filed Aug. 25, 1986 PCT Pub. No. WO87/01330 PCT Pub. Date Mar. 12, 1987.An improved packaging method for producing trays for packaging of food. The method includes the steps of (a) providing at least two webs of plastics material (1and 3) in parallel spaced apart relationship over an aperture (7) in a die part (5) so that the die part (5) is between the webs (1 and 3), (c) applying a female die cavity (15) to one of the webs (3) in aligned relationship to said aperture (7), (d) applying a reduction in air pressure to said female die cavity (15) whereby to draw the web closest to said female die cavity (15) thereinto, (e) applying a reduction in air pressure to said aperture (7) to draw the other web (1) into said aperture (7), (f) inserting a male die member (13) into said aperture (7) at least one of said female die cavity (5) or said male die member (13) having a surface which will form corrugations in one of the webs, (g) applying pressure between the male die member (13) and female die cavity (15) so that the two webs (1 and 3) can be bonded together and (h) then bonding the two webs (1 and 3) together where the corrugations in one web touch the other web.
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