Abstract A peel-seal container which comprises a layer of spunbonded olefin material joined to an unsupported film of polyethylene or to a supported film of a laminated or coated backing, such as polyethylene coated mylar, to form a peel-seal packet, container or pouch. The spunbonded olefin material is first pretreated with a heated die in the areas that are to form the peel-seal with heat and pressure satisfactory to render uniform surface characteristics to the spunbonded olefin. The heat, pressure and dwell time are sufficient to eliminate the high spots and internal weaknesses of the spunbonded olefin material. A web of synthetic polymeric material having a heat sealable surface is then applied and a conventional heat sealing method is utilized. The resulting container has a highly reliable peel-seal which can be readily peeled without tearing of the spunbonded olefin material. The containers of this invention are particularly well suited for medical uses where high resistance to tearing upon opening, sterile conditions and at least one transparent face are required.
A peel-seal container comprising a first layer of uncoated spunbonded olefin material and a second layer of synthetic polymeric thermoplastic material, said two layers being peelably joined together in an area along the longitudinal edges of the said container and across at least one end portion at an area removed from that one end, a peel flap formed at said one end by said layers overlying each other without being joined together, said first uncoated spunbonded olefin layer having its surface modified in the area of said peelable seal by pretreatment with heat and pressure to eliminate the high spots and internal weaknesses to render said sealing area susceptible to having said second layer peelably joined thereto by conventional heatpressure sealing.
Claim 2
Dependent Claim
121 words
A peel-seal container comprising a first layer of uncoated spunbonded olefin material and a second layer of synthetic polymeric thermoplastic material, said two layers being peelably joined together in an area along the longitudinal edges of the said container and across at least one end portion at an area removed from that one end, a peel flap formed at said one end by said layers overlying each other without being joined together, said first uncoated spunbonded olefin layer having its surface modified in the area of said peelable seal by pretreatment with heat and pressure to eliminate the high spots and internal weaknesses to render said sealing area susceptible to having said second layer peelably joined thereto by conventional heatpressure sealing.
Claim 3
Dependent Claim
45 words
The peel-seal container of claim 1 wherein said pretreatment is performed at temperatures of about 265* to about 290*F. with a dwell time of about three-quarter to about 2 second at a pressure of about 40 to about 60 psig to the entire peel-seal area.
Claim 4
Dependent Claim
50 words
The peel-seal container of claim 1 wherein said pretreatment is performed at temperatures of about 275* to about 300*F. with a dwell time of about one-half to about 2 seconds at a pressure of about 60 to about 100 psig to the peel-seal area at the edges of the container.
Claim 5
Dependent Claim
85 words
The peel-seal container of claim 1 wherein said pretreatment is performed at temperatures of about 265* to about 290*F. with a dwell time of about three-quarter to about 2 seconds at a pressure of about 40 to about 60 psig to the entire peel-seal area and at temperatures of about 275* to about 300*F with a dwell time of about 1/2 to about 2 seconds at a pressure of about 60 to about 100 psig to the peel-seal area at the edges of the container.
Claim 6
Dependent Claim
18 words
The peel-seal container of claim 1 wherein said pretreatment is perfoRmed to both longitudinal edges of said container.
Claim 7
Dependent Claim
38 words
The peel-seal container of claim 1 wherein said peel-seal along the longitudinal edges of said container stops at a distance inward from the edges of said container leaving the two sheets of said material unsealed at the edges.
Claim 8
Dependent Claim
12 words
The peal-seal container of claim 1 wherein said second layer is polyethylene.